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 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 void ipvlan_set_port_mode(struct ipvl_port *port, u32 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 err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port); 58 if (err) 59 goto err; 60 61 dev->priv_flags |= IFF_IPVLAN_MASTER; 62 return 0; 63 64 err: 65 kfree_rcu(port, rcu); 66 return err; 67 } 68 69 static void ipvlan_port_destroy(struct net_device *dev) 70 { 71 struct ipvl_port *port = ipvlan_port_get_rtnl(dev); 72 73 dev->priv_flags &= ~IFF_IPVLAN_MASTER; 74 netdev_rx_handler_unregister(dev); 75 kfree_rcu(port, rcu); 76 } 77 78 /* ipvlan network devices have devices nesting below it and are a special 79 * "super class" of normal network devices; split their locks off into a 80 * separate class since they always nest. 81 */ 82 static struct lock_class_key ipvlan_netdev_xmit_lock_key; 83 static struct lock_class_key ipvlan_netdev_addr_lock_key; 84 85 #define IPVLAN_FEATURES \ 86 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 87 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \ 88 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 89 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 90 91 #define IPVLAN_STATE_MASK \ 92 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 93 94 static void ipvlan_set_lockdep_class_one(struct net_device *dev, 95 struct netdev_queue *txq, 96 void *_unused) 97 { 98 lockdep_set_class(&txq->_xmit_lock, &ipvlan_netdev_xmit_lock_key); 99 } 100 101 static void ipvlan_set_lockdep_class(struct net_device *dev) 102 { 103 lockdep_set_class(&dev->addr_list_lock, &ipvlan_netdev_addr_lock_key); 104 netdev_for_each_tx_queue(dev, ipvlan_set_lockdep_class_one, NULL); 105 } 106 107 static int ipvlan_init(struct net_device *dev) 108 { 109 struct ipvl_dev *ipvlan = netdev_priv(dev); 110 const struct net_device *phy_dev = ipvlan->phy_dev; 111 112 dev->state = (dev->state & ~IPVLAN_STATE_MASK) | 113 (phy_dev->state & IPVLAN_STATE_MASK); 114 dev->features = phy_dev->features & IPVLAN_FEATURES; 115 dev->features |= NETIF_F_LLTX; 116 dev->gso_max_size = phy_dev->gso_max_size; 117 dev->iflink = phy_dev->ifindex; 118 dev->hard_header_len = phy_dev->hard_header_len; 119 120 ipvlan_set_lockdep_class(dev); 121 122 ipvlan->pcpu_stats = alloc_percpu(struct ipvl_pcpu_stats); 123 if (!ipvlan->pcpu_stats) 124 return -ENOMEM; 125 126 return 0; 127 } 128 129 static void ipvlan_uninit(struct net_device *dev) 130 { 131 struct ipvl_dev *ipvlan = netdev_priv(dev); 132 struct ipvl_port *port = ipvlan->port; 133 134 free_percpu(ipvlan->pcpu_stats); 135 136 port->count -= 1; 137 if (!port->count) 138 ipvlan_port_destroy(port->dev); 139 } 140 141 static int ipvlan_open(struct net_device *dev) 142 { 143 struct ipvl_dev *ipvlan = netdev_priv(dev); 144 struct net_device *phy_dev = ipvlan->phy_dev; 145 struct ipvl_addr *addr; 146 147 if (ipvlan->port->mode == IPVLAN_MODE_L3) 148 dev->flags |= IFF_NOARP; 149 else 150 dev->flags &= ~IFF_NOARP; 151 152 if (ipvlan->ipv6cnt > 0 || ipvlan->ipv4cnt > 0) { 153 list_for_each_entry(addr, &ipvlan->addrs, anode) 154 ipvlan_ht_addr_add(ipvlan, addr); 155 } 156 return dev_uc_add(phy_dev, phy_dev->dev_addr); 157 } 158 159 static int ipvlan_stop(struct net_device *dev) 160 { 161 struct ipvl_dev *ipvlan = netdev_priv(dev); 162 struct net_device *phy_dev = ipvlan->phy_dev; 163 struct ipvl_addr *addr; 164 165 dev_uc_unsync(phy_dev, dev); 166 dev_mc_unsync(phy_dev, dev); 167 168 dev_uc_del(phy_dev, phy_dev->dev_addr); 169 170 if (ipvlan->ipv6cnt > 0 || ipvlan->ipv4cnt > 0) { 171 list_for_each_entry(addr, &ipvlan->addrs, anode) 172 ipvlan_ht_addr_del(addr, !dev->dismantle); 173 } 174 return 0; 175 } 176 177 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb, 178 struct net_device *dev) 179 { 180 const struct ipvl_dev *ipvlan = netdev_priv(dev); 181 int skblen = skb->len; 182 int ret; 183 184 ret = ipvlan_queue_xmit(skb, dev); 185 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 186 struct ipvl_pcpu_stats *pcptr; 187 188 pcptr = this_cpu_ptr(ipvlan->pcpu_stats); 189 190 u64_stats_update_begin(&pcptr->syncp); 191 pcptr->tx_pkts++; 192 pcptr->tx_bytes += skblen; 193 u64_stats_update_end(&pcptr->syncp); 194 } else { 195 this_cpu_inc(ipvlan->pcpu_stats->tx_drps); 196 } 197 return ret; 198 } 199 200 static netdev_features_t ipvlan_fix_features(struct net_device *dev, 201 netdev_features_t features) 202 { 203 struct ipvl_dev *ipvlan = netdev_priv(dev); 204 205 return features & (ipvlan->sfeatures | ~IPVLAN_FEATURES); 206 } 207 208 static void ipvlan_change_rx_flags(struct net_device *dev, int change) 209 { 210 struct ipvl_dev *ipvlan = netdev_priv(dev); 211 struct net_device *phy_dev = ipvlan->phy_dev; 212 213 if (change & IFF_ALLMULTI) 214 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1); 215 } 216 217 static void ipvlan_set_broadcast_mac_filter(struct ipvl_dev *ipvlan, bool set) 218 { 219 struct net_device *dev = ipvlan->dev; 220 unsigned int hashbit = ipvlan_mac_hash(dev->broadcast); 221 222 if (set && !test_bit(hashbit, ipvlan->mac_filters)) 223 __set_bit(hashbit, ipvlan->mac_filters); 224 else if (!set && test_bit(hashbit, ipvlan->mac_filters)) 225 __clear_bit(hashbit, ipvlan->mac_filters); 226 } 227 228 static void ipvlan_set_multicast_mac_filter(struct net_device *dev) 229 { 230 struct ipvl_dev *ipvlan = netdev_priv(dev); 231 232 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 233 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE); 234 } else { 235 struct netdev_hw_addr *ha; 236 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE); 237 238 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE); 239 netdev_for_each_mc_addr(ha, dev) 240 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters); 241 242 bitmap_copy(ipvlan->mac_filters, mc_filters, 243 IPVLAN_MAC_FILTER_SIZE); 244 } 245 dev_uc_sync(ipvlan->phy_dev, dev); 246 dev_mc_sync(ipvlan->phy_dev, dev); 247 } 248 249 static struct rtnl_link_stats64 *ipvlan_get_stats64(struct net_device *dev, 250 struct rtnl_link_stats64 *s) 251 { 252 struct ipvl_dev *ipvlan = netdev_priv(dev); 253 254 if (ipvlan->pcpu_stats) { 255 struct ipvl_pcpu_stats *pcptr; 256 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes; 257 u32 rx_errs = 0, tx_drps = 0; 258 u32 strt; 259 int idx; 260 261 for_each_possible_cpu(idx) { 262 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx); 263 do { 264 strt= u64_stats_fetch_begin_irq(&pcptr->syncp); 265 rx_pkts = pcptr->rx_pkts; 266 rx_bytes = pcptr->rx_bytes; 267 rx_mcast = pcptr->rx_mcast; 268 tx_pkts = pcptr->tx_pkts; 269 tx_bytes = pcptr->tx_bytes; 270 } while (u64_stats_fetch_retry_irq(&pcptr->syncp, 271 strt)); 272 273 s->rx_packets += rx_pkts; 274 s->rx_bytes += rx_bytes; 275 s->multicast += rx_mcast; 276 s->tx_packets += tx_pkts; 277 s->tx_bytes += tx_bytes; 278 279 /* u32 values are updated without syncp protection. */ 280 rx_errs += pcptr->rx_errs; 281 tx_drps += pcptr->tx_drps; 282 } 283 s->rx_errors = rx_errs; 284 s->rx_dropped = rx_errs; 285 s->tx_dropped = tx_drps; 286 } 287 return s; 288 } 289 290 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid) 291 { 292 struct ipvl_dev *ipvlan = netdev_priv(dev); 293 struct net_device *phy_dev = ipvlan->phy_dev; 294 295 return vlan_vid_add(phy_dev, proto, vid); 296 } 297 298 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto, 299 u16 vid) 300 { 301 struct ipvl_dev *ipvlan = netdev_priv(dev); 302 struct net_device *phy_dev = ipvlan->phy_dev; 303 304 vlan_vid_del(phy_dev, proto, vid); 305 return 0; 306 } 307 308 static const struct net_device_ops ipvlan_netdev_ops = { 309 .ndo_init = ipvlan_init, 310 .ndo_uninit = ipvlan_uninit, 311 .ndo_open = ipvlan_open, 312 .ndo_stop = ipvlan_stop, 313 .ndo_start_xmit = ipvlan_start_xmit, 314 .ndo_fix_features = ipvlan_fix_features, 315 .ndo_change_rx_flags = ipvlan_change_rx_flags, 316 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter, 317 .ndo_get_stats64 = ipvlan_get_stats64, 318 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid, 319 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid, 320 }; 321 322 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 323 unsigned short type, const void *daddr, 324 const void *saddr, unsigned len) 325 { 326 const struct ipvl_dev *ipvlan = netdev_priv(dev); 327 struct net_device *phy_dev = ipvlan->phy_dev; 328 329 /* TODO Probably use a different field than dev_addr so that the 330 * mac-address on the virtual device is portable and can be carried 331 * while the packets use the mac-addr on the physical device. 332 */ 333 return dev_hard_header(skb, phy_dev, type, daddr, 334 saddr ? : dev->dev_addr, len); 335 } 336 337 static const struct header_ops ipvlan_header_ops = { 338 .create = ipvlan_hard_header, 339 .parse = eth_header_parse, 340 .cache = eth_header_cache, 341 .cache_update = eth_header_cache_update, 342 }; 343 344 static int ipvlan_ethtool_get_settings(struct net_device *dev, 345 struct ethtool_cmd *cmd) 346 { 347 const struct ipvl_dev *ipvlan = netdev_priv(dev); 348 349 return __ethtool_get_settings(ipvlan->phy_dev, cmd); 350 } 351 352 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev, 353 struct ethtool_drvinfo *drvinfo) 354 { 355 strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver)); 356 strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version)); 357 } 358 359 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev) 360 { 361 const struct ipvl_dev *ipvlan = netdev_priv(dev); 362 363 return ipvlan->msg_enable; 364 } 365 366 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value) 367 { 368 struct ipvl_dev *ipvlan = netdev_priv(dev); 369 370 ipvlan->msg_enable = value; 371 } 372 373 static const struct ethtool_ops ipvlan_ethtool_ops = { 374 .get_link = ethtool_op_get_link, 375 .get_settings = ipvlan_ethtool_get_settings, 376 .get_drvinfo = ipvlan_ethtool_get_drvinfo, 377 .get_msglevel = ipvlan_ethtool_get_msglevel, 378 .set_msglevel = ipvlan_ethtool_set_msglevel, 379 }; 380 381 static int ipvlan_nl_changelink(struct net_device *dev, 382 struct nlattr *tb[], struct nlattr *data[]) 383 { 384 struct ipvl_dev *ipvlan = netdev_priv(dev); 385 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 386 387 if (data && data[IFLA_IPVLAN_MODE]) { 388 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 389 390 ipvlan_set_port_mode(port, nmode); 391 } 392 return 0; 393 } 394 395 static size_t ipvlan_nl_getsize(const struct net_device *dev) 396 { 397 return (0 398 + nla_total_size(2) /* IFLA_IPVLAN_MODE */ 399 ); 400 } 401 402 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[]) 403 { 404 if (data && data[IFLA_IPVLAN_MODE]) { 405 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 406 407 if (mode < IPVLAN_MODE_L2 || mode >= IPVLAN_MODE_MAX) 408 return -EINVAL; 409 } 410 return 0; 411 } 412 413 static int ipvlan_nl_fillinfo(struct sk_buff *skb, 414 const struct net_device *dev) 415 { 416 struct ipvl_dev *ipvlan = netdev_priv(dev); 417 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 418 int ret = -EINVAL; 419 420 if (!port) 421 goto err; 422 423 ret = -EMSGSIZE; 424 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode)) 425 goto err; 426 427 return 0; 428 429 err: 430 return ret; 431 } 432 433 static int ipvlan_link_new(struct net *src_net, struct net_device *dev, 434 struct nlattr *tb[], struct nlattr *data[]) 435 { 436 struct ipvl_dev *ipvlan = netdev_priv(dev); 437 struct ipvl_port *port; 438 struct net_device *phy_dev; 439 int err; 440 441 if (!tb[IFLA_LINK]) 442 return -EINVAL; 443 444 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 445 if (!phy_dev) 446 return -ENODEV; 447 448 if (netif_is_ipvlan(phy_dev)) { 449 struct ipvl_dev *tmp = netdev_priv(phy_dev); 450 451 phy_dev = tmp->phy_dev; 452 } else if (!netif_is_ipvlan_port(phy_dev)) { 453 err = ipvlan_port_create(phy_dev); 454 if (err < 0) 455 return err; 456 } 457 458 port = ipvlan_port_get_rtnl(phy_dev); 459 if (data && data[IFLA_IPVLAN_MODE]) 460 port->mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 461 462 ipvlan->phy_dev = phy_dev; 463 ipvlan->dev = dev; 464 ipvlan->port = port; 465 ipvlan->sfeatures = IPVLAN_FEATURES; 466 INIT_LIST_HEAD(&ipvlan->addrs); 467 ipvlan->ipv4cnt = 0; 468 ipvlan->ipv6cnt = 0; 469 470 /* TODO Probably put random address here to be presented to the 471 * world but keep using the physical-dev address for the outgoing 472 * packets. 473 */ 474 memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN); 475 476 dev->priv_flags |= IFF_IPVLAN_SLAVE; 477 478 port->count += 1; 479 err = register_netdevice(dev); 480 if (err < 0) 481 goto ipvlan_destroy_port; 482 483 err = netdev_upper_dev_link(phy_dev, dev); 484 if (err) 485 goto ipvlan_destroy_port; 486 487 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans); 488 netif_stacked_transfer_operstate(phy_dev, dev); 489 return 0; 490 491 ipvlan_destroy_port: 492 port->count -= 1; 493 if (!port->count) 494 ipvlan_port_destroy(phy_dev); 495 496 return err; 497 } 498 499 static void ipvlan_link_delete(struct net_device *dev, struct list_head *head) 500 { 501 struct ipvl_dev *ipvlan = netdev_priv(dev); 502 struct ipvl_addr *addr, *next; 503 504 if (ipvlan->ipv6cnt > 0 || ipvlan->ipv4cnt > 0) { 505 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) { 506 ipvlan_ht_addr_del(addr, !dev->dismantle); 507 list_del_rcu(&addr->anode); 508 } 509 } 510 list_del_rcu(&ipvlan->pnode); 511 unregister_netdevice_queue(dev, head); 512 netdev_upper_dev_unlink(ipvlan->phy_dev, dev); 513 } 514 515 static void ipvlan_link_setup(struct net_device *dev) 516 { 517 ether_setup(dev); 518 519 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 520 dev->priv_flags |= IFF_UNICAST_FLT; 521 dev->netdev_ops = &ipvlan_netdev_ops; 522 dev->destructor = free_netdev; 523 dev->header_ops = &ipvlan_header_ops; 524 dev->ethtool_ops = &ipvlan_ethtool_ops; 525 dev->tx_queue_len = 0; 526 } 527 528 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] = 529 { 530 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 }, 531 }; 532 533 static struct rtnl_link_ops ipvlan_link_ops = { 534 .kind = "ipvlan", 535 .priv_size = sizeof(struct ipvl_dev), 536 537 .get_size = ipvlan_nl_getsize, 538 .policy = ipvlan_nl_policy, 539 .validate = ipvlan_nl_validate, 540 .fill_info = ipvlan_nl_fillinfo, 541 .changelink = ipvlan_nl_changelink, 542 .maxtype = IFLA_IPVLAN_MAX, 543 544 .setup = ipvlan_link_setup, 545 .newlink = ipvlan_link_new, 546 .dellink = ipvlan_link_delete, 547 }; 548 549 static int ipvlan_link_register(struct rtnl_link_ops *ops) 550 { 551 return rtnl_link_register(ops); 552 } 553 554 static int ipvlan_device_event(struct notifier_block *unused, 555 unsigned long event, void *ptr) 556 { 557 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 558 struct ipvl_dev *ipvlan, *next; 559 struct ipvl_port *port; 560 LIST_HEAD(lst_kill); 561 562 if (!netif_is_ipvlan_port(dev)) 563 return NOTIFY_DONE; 564 565 port = ipvlan_port_get_rtnl(dev); 566 567 switch (event) { 568 case NETDEV_CHANGE: 569 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 570 netif_stacked_transfer_operstate(ipvlan->phy_dev, 571 ipvlan->dev); 572 break; 573 574 case NETDEV_UNREGISTER: 575 if (dev->reg_state != NETREG_UNREGISTERING) 576 break; 577 578 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, 579 pnode) 580 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev, 581 &lst_kill); 582 unregister_netdevice_many(&lst_kill); 583 break; 584 585 case NETDEV_FEAT_CHANGE: 586 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 587 ipvlan->dev->features = dev->features & IPVLAN_FEATURES; 588 ipvlan->dev->gso_max_size = dev->gso_max_size; 589 netdev_features_change(ipvlan->dev); 590 } 591 break; 592 593 case NETDEV_CHANGEMTU: 594 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 595 ipvlan_adjust_mtu(ipvlan, dev); 596 break; 597 598 case NETDEV_PRE_TYPE_CHANGE: 599 /* Forbid underlying device to change its type. */ 600 return NOTIFY_BAD; 601 } 602 return NOTIFY_DONE; 603 } 604 605 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 606 { 607 struct ipvl_addr *addr; 608 609 if (ipvlan_addr_busy(ipvlan, ip6_addr, true)) { 610 netif_err(ipvlan, ifup, ipvlan->dev, 611 "Failed to add IPv6=%pI6c addr for %s intf\n", 612 ip6_addr, ipvlan->dev->name); 613 return -EINVAL; 614 } 615 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC); 616 if (!addr) 617 return -ENOMEM; 618 619 addr->master = ipvlan; 620 memcpy(&addr->ip6addr, ip6_addr, sizeof(struct in6_addr)); 621 addr->atype = IPVL_IPV6; 622 list_add_tail_rcu(&addr->anode, &ipvlan->addrs); 623 ipvlan->ipv6cnt++; 624 ipvlan_ht_addr_add(ipvlan, addr); 625 626 return 0; 627 } 628 629 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 630 { 631 struct ipvl_addr *addr; 632 633 addr = ipvlan_ht_addr_lookup(ipvlan->port, ip6_addr, true); 634 if (!addr) 635 return; 636 637 ipvlan_ht_addr_del(addr, true); 638 list_del_rcu(&addr->anode); 639 ipvlan->ipv6cnt--; 640 WARN_ON(ipvlan->ipv6cnt < 0); 641 kfree_rcu(addr, rcu); 642 643 return; 644 } 645 646 static int ipvlan_addr6_event(struct notifier_block *unused, 647 unsigned long event, void *ptr) 648 { 649 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr; 650 struct net_device *dev = (struct net_device *)if6->idev->dev; 651 struct ipvl_dev *ipvlan = netdev_priv(dev); 652 653 if (!netif_is_ipvlan(dev)) 654 return NOTIFY_DONE; 655 656 if (!ipvlan || !ipvlan->port) 657 return NOTIFY_DONE; 658 659 switch (event) { 660 case NETDEV_UP: 661 if (ipvlan_add_addr6(ipvlan, &if6->addr)) 662 return NOTIFY_BAD; 663 break; 664 665 case NETDEV_DOWN: 666 ipvlan_del_addr6(ipvlan, &if6->addr); 667 break; 668 } 669 670 return NOTIFY_OK; 671 } 672 673 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 674 { 675 struct ipvl_addr *addr; 676 677 if (ipvlan_addr_busy(ipvlan, ip4_addr, false)) { 678 netif_err(ipvlan, ifup, ipvlan->dev, 679 "Failed to add IPv4=%pI4 on %s intf.\n", 680 ip4_addr, ipvlan->dev->name); 681 return -EINVAL; 682 } 683 addr = kzalloc(sizeof(struct ipvl_addr), GFP_KERNEL); 684 if (!addr) 685 return -ENOMEM; 686 687 addr->master = ipvlan; 688 memcpy(&addr->ip4addr, ip4_addr, sizeof(struct in_addr)); 689 addr->atype = IPVL_IPV4; 690 list_add_tail_rcu(&addr->anode, &ipvlan->addrs); 691 ipvlan->ipv4cnt++; 692 ipvlan_ht_addr_add(ipvlan, addr); 693 ipvlan_set_broadcast_mac_filter(ipvlan, true); 694 695 return 0; 696 } 697 698 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 699 { 700 struct ipvl_addr *addr; 701 702 addr = ipvlan_ht_addr_lookup(ipvlan->port, ip4_addr, false); 703 if (!addr) 704 return; 705 706 ipvlan_ht_addr_del(addr, true); 707 list_del_rcu(&addr->anode); 708 ipvlan->ipv4cnt--; 709 WARN_ON(ipvlan->ipv4cnt < 0); 710 if (!ipvlan->ipv4cnt) 711 ipvlan_set_broadcast_mac_filter(ipvlan, false); 712 kfree_rcu(addr, rcu); 713 714 return; 715 } 716 717 static int ipvlan_addr4_event(struct notifier_block *unused, 718 unsigned long event, void *ptr) 719 { 720 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr; 721 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev; 722 struct ipvl_dev *ipvlan = netdev_priv(dev); 723 struct in_addr ip4_addr; 724 725 if (!netif_is_ipvlan(dev)) 726 return NOTIFY_DONE; 727 728 if (!ipvlan || !ipvlan->port) 729 return NOTIFY_DONE; 730 731 switch (event) { 732 case NETDEV_UP: 733 ip4_addr.s_addr = if4->ifa_address; 734 if (ipvlan_add_addr4(ipvlan, &ip4_addr)) 735 return NOTIFY_BAD; 736 break; 737 738 case NETDEV_DOWN: 739 ip4_addr.s_addr = if4->ifa_address; 740 ipvlan_del_addr4(ipvlan, &ip4_addr); 741 break; 742 } 743 744 return NOTIFY_OK; 745 } 746 747 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = { 748 .notifier_call = ipvlan_addr4_event, 749 }; 750 751 static struct notifier_block ipvlan_notifier_block __read_mostly = { 752 .notifier_call = ipvlan_device_event, 753 }; 754 755 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = { 756 .notifier_call = ipvlan_addr6_event, 757 }; 758 759 static int __init ipvlan_init_module(void) 760 { 761 int err; 762 763 ipvlan_init_secret(); 764 register_netdevice_notifier(&ipvlan_notifier_block); 765 register_inet6addr_notifier(&ipvlan_addr6_notifier_block); 766 register_inetaddr_notifier(&ipvlan_addr4_notifier_block); 767 768 err = ipvlan_link_register(&ipvlan_link_ops); 769 if (err < 0) 770 goto error; 771 772 return 0; 773 error: 774 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block); 775 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block); 776 unregister_netdevice_notifier(&ipvlan_notifier_block); 777 return err; 778 } 779 780 static void __exit ipvlan_cleanup_module(void) 781 { 782 rtnl_link_unregister(&ipvlan_link_ops); 783 unregister_netdevice_notifier(&ipvlan_notifier_block); 784 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block); 785 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block); 786 } 787 788 module_init(ipvlan_init_module); 789 module_exit(ipvlan_cleanup_module); 790 791 MODULE_LICENSE("GPL"); 792 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>"); 793 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs"); 794 MODULE_ALIAS_RTNL_LINK("ipvlan"); 795