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 u32 ipvl_nf_hook_refcnt = 0; 13 14 static struct nf_hook_ops ipvl_nfops[] __read_mostly = { 15 { 16 .hook = ipvlan_nf_input, 17 .pf = NFPROTO_IPV4, 18 .hooknum = NF_INET_LOCAL_IN, 19 .priority = INT_MAX, 20 }, 21 { 22 .hook = ipvlan_nf_input, 23 .pf = NFPROTO_IPV6, 24 .hooknum = NF_INET_LOCAL_IN, 25 .priority = INT_MAX, 26 }, 27 }; 28 29 static struct l3mdev_ops ipvl_l3mdev_ops __read_mostly = { 30 .l3mdev_l3_rcv = ipvlan_l3_rcv, 31 }; 32 33 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev) 34 { 35 ipvlan->dev->mtu = dev->mtu - ipvlan->mtu_adj; 36 } 37 38 static int ipvlan_register_nf_hook(void) 39 { 40 int err = 0; 41 42 if (!ipvl_nf_hook_refcnt) { 43 err = _nf_register_hooks(ipvl_nfops, ARRAY_SIZE(ipvl_nfops)); 44 if (!err) 45 ipvl_nf_hook_refcnt = 1; 46 } else { 47 ipvl_nf_hook_refcnt++; 48 } 49 50 return err; 51 } 52 53 static void ipvlan_unregister_nf_hook(void) 54 { 55 WARN_ON(!ipvl_nf_hook_refcnt); 56 57 ipvl_nf_hook_refcnt--; 58 if (!ipvl_nf_hook_refcnt) 59 _nf_unregister_hooks(ipvl_nfops, ARRAY_SIZE(ipvl_nfops)); 60 } 61 62 static int ipvlan_set_port_mode(struct ipvl_port *port, u16 nval) 63 { 64 struct ipvl_dev *ipvlan; 65 struct net_device *mdev = port->dev; 66 int err = 0; 67 68 ASSERT_RTNL(); 69 if (port->mode != nval) { 70 if (nval == IPVLAN_MODE_L3S) { 71 /* New mode is L3S */ 72 err = ipvlan_register_nf_hook(); 73 if (!err) { 74 mdev->l3mdev_ops = &ipvl_l3mdev_ops; 75 mdev->priv_flags |= IFF_L3MDEV_MASTER; 76 } else 77 return err; 78 } else if (port->mode == IPVLAN_MODE_L3S) { 79 /* Old mode was L3S */ 80 mdev->priv_flags &= ~IFF_L3MDEV_MASTER; 81 ipvlan_unregister_nf_hook(); 82 mdev->l3mdev_ops = NULL; 83 } 84 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 85 if (nval == IPVLAN_MODE_L3 || nval == IPVLAN_MODE_L3S) 86 ipvlan->dev->flags |= IFF_NOARP; 87 else 88 ipvlan->dev->flags &= ~IFF_NOARP; 89 } 90 port->mode = nval; 91 } 92 return err; 93 } 94 95 static int ipvlan_port_create(struct net_device *dev) 96 { 97 struct ipvl_port *port; 98 int err, idx; 99 100 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) { 101 netdev_err(dev, "Master is either lo or non-ether device\n"); 102 return -EINVAL; 103 } 104 105 if (netif_is_macvlan_port(dev)) { 106 netdev_err(dev, "Master is a macvlan port.\n"); 107 return -EBUSY; 108 } 109 110 port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL); 111 if (!port) 112 return -ENOMEM; 113 114 port->dev = dev; 115 port->mode = IPVLAN_MODE_L3; 116 INIT_LIST_HEAD(&port->ipvlans); 117 for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++) 118 INIT_HLIST_HEAD(&port->hlhead[idx]); 119 120 skb_queue_head_init(&port->backlog); 121 INIT_WORK(&port->wq, ipvlan_process_multicast); 122 123 err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port); 124 if (err) 125 goto err; 126 127 dev->priv_flags |= IFF_IPVLAN_MASTER; 128 return 0; 129 130 err: 131 kfree_rcu(port, rcu); 132 return err; 133 } 134 135 static void ipvlan_port_destroy(struct net_device *dev) 136 { 137 struct ipvl_port *port = ipvlan_port_get_rtnl(dev); 138 139 dev->priv_flags &= ~IFF_IPVLAN_MASTER; 140 if (port->mode == IPVLAN_MODE_L3S) { 141 dev->priv_flags &= ~IFF_L3MDEV_MASTER; 142 ipvlan_unregister_nf_hook(); 143 dev->l3mdev_ops = NULL; 144 } 145 netdev_rx_handler_unregister(dev); 146 cancel_work_sync(&port->wq); 147 __skb_queue_purge(&port->backlog); 148 kfree_rcu(port, rcu); 149 } 150 151 #define IPVLAN_FEATURES \ 152 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 153 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \ 154 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 155 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 156 157 #define IPVLAN_STATE_MASK \ 158 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 159 160 static int ipvlan_init(struct net_device *dev) 161 { 162 struct ipvl_dev *ipvlan = netdev_priv(dev); 163 const struct net_device *phy_dev = ipvlan->phy_dev; 164 struct ipvl_port *port = ipvlan->port; 165 166 dev->state = (dev->state & ~IPVLAN_STATE_MASK) | 167 (phy_dev->state & IPVLAN_STATE_MASK); 168 dev->features = phy_dev->features & IPVLAN_FEATURES; 169 dev->features |= NETIF_F_LLTX; 170 dev->gso_max_size = phy_dev->gso_max_size; 171 dev->gso_max_segs = phy_dev->gso_max_segs; 172 dev->hard_header_len = phy_dev->hard_header_len; 173 174 netdev_lockdep_set_classes(dev); 175 176 ipvlan->pcpu_stats = alloc_percpu(struct ipvl_pcpu_stats); 177 if (!ipvlan->pcpu_stats) 178 return -ENOMEM; 179 180 port->count += 1; 181 182 return 0; 183 } 184 185 static void ipvlan_uninit(struct net_device *dev) 186 { 187 struct ipvl_dev *ipvlan = netdev_priv(dev); 188 struct ipvl_port *port = ipvlan->port; 189 190 free_percpu(ipvlan->pcpu_stats); 191 192 port->count -= 1; 193 if (!port->count) 194 ipvlan_port_destroy(port->dev); 195 } 196 197 static int ipvlan_open(struct net_device *dev) 198 { 199 struct ipvl_dev *ipvlan = netdev_priv(dev); 200 struct net_device *phy_dev = ipvlan->phy_dev; 201 struct ipvl_addr *addr; 202 203 if (ipvlan->port->mode == IPVLAN_MODE_L3 || 204 ipvlan->port->mode == IPVLAN_MODE_L3S) 205 dev->flags |= IFF_NOARP; 206 else 207 dev->flags &= ~IFF_NOARP; 208 209 list_for_each_entry(addr, &ipvlan->addrs, anode) 210 ipvlan_ht_addr_add(ipvlan, addr); 211 212 return dev_uc_add(phy_dev, phy_dev->dev_addr); 213 } 214 215 static int ipvlan_stop(struct net_device *dev) 216 { 217 struct ipvl_dev *ipvlan = netdev_priv(dev); 218 struct net_device *phy_dev = ipvlan->phy_dev; 219 struct ipvl_addr *addr; 220 221 dev_uc_unsync(phy_dev, dev); 222 dev_mc_unsync(phy_dev, dev); 223 224 dev_uc_del(phy_dev, phy_dev->dev_addr); 225 226 list_for_each_entry(addr, &ipvlan->addrs, anode) 227 ipvlan_ht_addr_del(addr); 228 229 return 0; 230 } 231 232 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb, 233 struct net_device *dev) 234 { 235 const struct ipvl_dev *ipvlan = netdev_priv(dev); 236 int skblen = skb->len; 237 int ret; 238 239 ret = ipvlan_queue_xmit(skb, dev); 240 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 241 struct ipvl_pcpu_stats *pcptr; 242 243 pcptr = this_cpu_ptr(ipvlan->pcpu_stats); 244 245 u64_stats_update_begin(&pcptr->syncp); 246 pcptr->tx_pkts++; 247 pcptr->tx_bytes += skblen; 248 u64_stats_update_end(&pcptr->syncp); 249 } else { 250 this_cpu_inc(ipvlan->pcpu_stats->tx_drps); 251 } 252 return ret; 253 } 254 255 static netdev_features_t ipvlan_fix_features(struct net_device *dev, 256 netdev_features_t features) 257 { 258 struct ipvl_dev *ipvlan = netdev_priv(dev); 259 260 return features & (ipvlan->sfeatures | ~IPVLAN_FEATURES); 261 } 262 263 static void ipvlan_change_rx_flags(struct net_device *dev, int change) 264 { 265 struct ipvl_dev *ipvlan = netdev_priv(dev); 266 struct net_device *phy_dev = ipvlan->phy_dev; 267 268 if (change & IFF_ALLMULTI) 269 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1); 270 } 271 272 static void ipvlan_set_multicast_mac_filter(struct net_device *dev) 273 { 274 struct ipvl_dev *ipvlan = netdev_priv(dev); 275 276 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 277 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE); 278 } else { 279 struct netdev_hw_addr *ha; 280 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE); 281 282 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE); 283 netdev_for_each_mc_addr(ha, dev) 284 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters); 285 286 /* Turn-on broadcast bit irrespective of address family, 287 * since broadcast is deferred to a work-queue, hence no 288 * impact on fast-path processing. 289 */ 290 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters); 291 292 bitmap_copy(ipvlan->mac_filters, mc_filters, 293 IPVLAN_MAC_FILTER_SIZE); 294 } 295 dev_uc_sync(ipvlan->phy_dev, dev); 296 dev_mc_sync(ipvlan->phy_dev, dev); 297 } 298 299 static struct rtnl_link_stats64 *ipvlan_get_stats64(struct net_device *dev, 300 struct rtnl_link_stats64 *s) 301 { 302 struct ipvl_dev *ipvlan = netdev_priv(dev); 303 304 if (ipvlan->pcpu_stats) { 305 struct ipvl_pcpu_stats *pcptr; 306 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes; 307 u32 rx_errs = 0, tx_drps = 0; 308 u32 strt; 309 int idx; 310 311 for_each_possible_cpu(idx) { 312 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx); 313 do { 314 strt= u64_stats_fetch_begin_irq(&pcptr->syncp); 315 rx_pkts = pcptr->rx_pkts; 316 rx_bytes = pcptr->rx_bytes; 317 rx_mcast = pcptr->rx_mcast; 318 tx_pkts = pcptr->tx_pkts; 319 tx_bytes = pcptr->tx_bytes; 320 } while (u64_stats_fetch_retry_irq(&pcptr->syncp, 321 strt)); 322 323 s->rx_packets += rx_pkts; 324 s->rx_bytes += rx_bytes; 325 s->multicast += rx_mcast; 326 s->tx_packets += tx_pkts; 327 s->tx_bytes += tx_bytes; 328 329 /* u32 values are updated without syncp protection. */ 330 rx_errs += pcptr->rx_errs; 331 tx_drps += pcptr->tx_drps; 332 } 333 s->rx_errors = rx_errs; 334 s->rx_dropped = rx_errs; 335 s->tx_dropped = tx_drps; 336 } 337 return s; 338 } 339 340 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid) 341 { 342 struct ipvl_dev *ipvlan = netdev_priv(dev); 343 struct net_device *phy_dev = ipvlan->phy_dev; 344 345 return vlan_vid_add(phy_dev, proto, vid); 346 } 347 348 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto, 349 u16 vid) 350 { 351 struct ipvl_dev *ipvlan = netdev_priv(dev); 352 struct net_device *phy_dev = ipvlan->phy_dev; 353 354 vlan_vid_del(phy_dev, proto, vid); 355 return 0; 356 } 357 358 static int ipvlan_get_iflink(const struct net_device *dev) 359 { 360 struct ipvl_dev *ipvlan = netdev_priv(dev); 361 362 return ipvlan->phy_dev->ifindex; 363 } 364 365 static const struct net_device_ops ipvlan_netdev_ops = { 366 .ndo_init = ipvlan_init, 367 .ndo_uninit = ipvlan_uninit, 368 .ndo_open = ipvlan_open, 369 .ndo_stop = ipvlan_stop, 370 .ndo_start_xmit = ipvlan_start_xmit, 371 .ndo_fix_features = ipvlan_fix_features, 372 .ndo_change_rx_flags = ipvlan_change_rx_flags, 373 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter, 374 .ndo_get_stats64 = ipvlan_get_stats64, 375 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid, 376 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid, 377 .ndo_get_iflink = ipvlan_get_iflink, 378 }; 379 380 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 381 unsigned short type, const void *daddr, 382 const void *saddr, unsigned len) 383 { 384 const struct ipvl_dev *ipvlan = netdev_priv(dev); 385 struct net_device *phy_dev = ipvlan->phy_dev; 386 387 /* TODO Probably use a different field than dev_addr so that the 388 * mac-address on the virtual device is portable and can be carried 389 * while the packets use the mac-addr on the physical device. 390 */ 391 return dev_hard_header(skb, phy_dev, type, daddr, 392 saddr ? : dev->dev_addr, len); 393 } 394 395 static const struct header_ops ipvlan_header_ops = { 396 .create = ipvlan_hard_header, 397 .parse = eth_header_parse, 398 .cache = eth_header_cache, 399 .cache_update = eth_header_cache_update, 400 }; 401 402 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev, 403 struct ethtool_link_ksettings *cmd) 404 { 405 const struct ipvl_dev *ipvlan = netdev_priv(dev); 406 407 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd); 408 } 409 410 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev, 411 struct ethtool_drvinfo *drvinfo) 412 { 413 strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver)); 414 strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version)); 415 } 416 417 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev) 418 { 419 const struct ipvl_dev *ipvlan = netdev_priv(dev); 420 421 return ipvlan->msg_enable; 422 } 423 424 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value) 425 { 426 struct ipvl_dev *ipvlan = netdev_priv(dev); 427 428 ipvlan->msg_enable = value; 429 } 430 431 static const struct ethtool_ops ipvlan_ethtool_ops = { 432 .get_link = ethtool_op_get_link, 433 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings, 434 .get_drvinfo = ipvlan_ethtool_get_drvinfo, 435 .get_msglevel = ipvlan_ethtool_get_msglevel, 436 .set_msglevel = ipvlan_ethtool_set_msglevel, 437 }; 438 439 static int ipvlan_nl_changelink(struct net_device *dev, 440 struct nlattr *tb[], struct nlattr *data[]) 441 { 442 struct ipvl_dev *ipvlan = netdev_priv(dev); 443 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 444 int err = 0; 445 446 if (data && data[IFLA_IPVLAN_MODE]) { 447 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 448 449 err = ipvlan_set_port_mode(port, nmode); 450 } 451 return err; 452 } 453 454 static size_t ipvlan_nl_getsize(const struct net_device *dev) 455 { 456 return (0 457 + nla_total_size(2) /* IFLA_IPVLAN_MODE */ 458 ); 459 } 460 461 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[]) 462 { 463 if (data && data[IFLA_IPVLAN_MODE]) { 464 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 465 466 if (mode < IPVLAN_MODE_L2 || mode >= IPVLAN_MODE_MAX) 467 return -EINVAL; 468 } 469 return 0; 470 } 471 472 static int ipvlan_nl_fillinfo(struct sk_buff *skb, 473 const struct net_device *dev) 474 { 475 struct ipvl_dev *ipvlan = netdev_priv(dev); 476 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 477 int ret = -EINVAL; 478 479 if (!port) 480 goto err; 481 482 ret = -EMSGSIZE; 483 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode)) 484 goto err; 485 486 return 0; 487 488 err: 489 return ret; 490 } 491 492 static int ipvlan_link_new(struct net *src_net, struct net_device *dev, 493 struct nlattr *tb[], struct nlattr *data[]) 494 { 495 struct ipvl_dev *ipvlan = netdev_priv(dev); 496 struct ipvl_port *port; 497 struct net_device *phy_dev; 498 int err; 499 u16 mode = IPVLAN_MODE_L3; 500 501 if (!tb[IFLA_LINK]) 502 return -EINVAL; 503 504 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 505 if (!phy_dev) 506 return -ENODEV; 507 508 if (netif_is_ipvlan(phy_dev)) { 509 struct ipvl_dev *tmp = netdev_priv(phy_dev); 510 511 phy_dev = tmp->phy_dev; 512 } else if (!netif_is_ipvlan_port(phy_dev)) { 513 err = ipvlan_port_create(phy_dev); 514 if (err < 0) 515 return err; 516 } 517 518 if (data && data[IFLA_IPVLAN_MODE]) 519 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 520 521 port = ipvlan_port_get_rtnl(phy_dev); 522 ipvlan->phy_dev = phy_dev; 523 ipvlan->dev = dev; 524 ipvlan->port = port; 525 ipvlan->sfeatures = IPVLAN_FEATURES; 526 ipvlan_adjust_mtu(ipvlan, phy_dev); 527 INIT_LIST_HEAD(&ipvlan->addrs); 528 529 /* TODO Probably put random address here to be presented to the 530 * world but keep using the physical-dev address for the outgoing 531 * packets. 532 */ 533 memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN); 534 535 dev->priv_flags |= IFF_IPVLAN_SLAVE; 536 537 err = register_netdevice(dev); 538 if (err < 0) 539 return err; 540 541 err = netdev_upper_dev_link(phy_dev, dev); 542 if (err) { 543 unregister_netdevice(dev); 544 return err; 545 } 546 err = ipvlan_set_port_mode(port, mode); 547 if (err) { 548 unregister_netdevice(dev); 549 return err; 550 } 551 552 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans); 553 netif_stacked_transfer_operstate(phy_dev, dev); 554 return 0; 555 } 556 557 static void ipvlan_link_delete(struct net_device *dev, struct list_head *head) 558 { 559 struct ipvl_dev *ipvlan = netdev_priv(dev); 560 struct ipvl_addr *addr, *next; 561 562 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) { 563 ipvlan_ht_addr_del(addr); 564 list_del(&addr->anode); 565 kfree_rcu(addr, rcu); 566 } 567 568 list_del_rcu(&ipvlan->pnode); 569 unregister_netdevice_queue(dev, head); 570 netdev_upper_dev_unlink(ipvlan->phy_dev, dev); 571 } 572 573 static void ipvlan_link_setup(struct net_device *dev) 574 { 575 ether_setup(dev); 576 577 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 578 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE; 579 dev->netdev_ops = &ipvlan_netdev_ops; 580 dev->destructor = free_netdev; 581 dev->header_ops = &ipvlan_header_ops; 582 dev->ethtool_ops = &ipvlan_ethtool_ops; 583 } 584 585 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] = 586 { 587 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 }, 588 }; 589 590 static struct rtnl_link_ops ipvlan_link_ops = { 591 .kind = "ipvlan", 592 .priv_size = sizeof(struct ipvl_dev), 593 594 .get_size = ipvlan_nl_getsize, 595 .policy = ipvlan_nl_policy, 596 .validate = ipvlan_nl_validate, 597 .fill_info = ipvlan_nl_fillinfo, 598 .changelink = ipvlan_nl_changelink, 599 .maxtype = IFLA_IPVLAN_MAX, 600 601 .setup = ipvlan_link_setup, 602 .newlink = ipvlan_link_new, 603 .dellink = ipvlan_link_delete, 604 }; 605 606 static int ipvlan_link_register(struct rtnl_link_ops *ops) 607 { 608 return rtnl_link_register(ops); 609 } 610 611 static int ipvlan_device_event(struct notifier_block *unused, 612 unsigned long event, void *ptr) 613 { 614 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 615 struct ipvl_dev *ipvlan, *next; 616 struct ipvl_port *port; 617 LIST_HEAD(lst_kill); 618 619 if (!netif_is_ipvlan_port(dev)) 620 return NOTIFY_DONE; 621 622 port = ipvlan_port_get_rtnl(dev); 623 624 switch (event) { 625 case NETDEV_CHANGE: 626 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 627 netif_stacked_transfer_operstate(ipvlan->phy_dev, 628 ipvlan->dev); 629 break; 630 631 case NETDEV_UNREGISTER: 632 if (dev->reg_state != NETREG_UNREGISTERING) 633 break; 634 635 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, 636 pnode) 637 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev, 638 &lst_kill); 639 unregister_netdevice_many(&lst_kill); 640 break; 641 642 case NETDEV_FEAT_CHANGE: 643 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 644 ipvlan->dev->features = dev->features & IPVLAN_FEATURES; 645 ipvlan->dev->gso_max_size = dev->gso_max_size; 646 ipvlan->dev->gso_max_segs = dev->gso_max_segs; 647 netdev_features_change(ipvlan->dev); 648 } 649 break; 650 651 case NETDEV_CHANGEMTU: 652 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 653 ipvlan_adjust_mtu(ipvlan, dev); 654 break; 655 656 case NETDEV_PRE_TYPE_CHANGE: 657 /* Forbid underlying device to change its type. */ 658 return NOTIFY_BAD; 659 } 660 return NOTIFY_DONE; 661 } 662 663 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 664 { 665 struct ipvl_addr *addr; 666 667 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true)) { 668 netif_err(ipvlan, ifup, ipvlan->dev, 669 "Failed to add IPv6=%pI6c addr for %s intf\n", 670 ip6_addr, ipvlan->dev->name); 671 return -EINVAL; 672 } 673 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC); 674 if (!addr) 675 return -ENOMEM; 676 677 addr->master = ipvlan; 678 memcpy(&addr->ip6addr, ip6_addr, sizeof(struct in6_addr)); 679 addr->atype = IPVL_IPV6; 680 list_add_tail(&addr->anode, &ipvlan->addrs); 681 682 /* If the interface is not up, the address will be added to the hash 683 * list by ipvlan_open. 684 */ 685 if (netif_running(ipvlan->dev)) 686 ipvlan_ht_addr_add(ipvlan, addr); 687 688 return 0; 689 } 690 691 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 692 { 693 struct ipvl_addr *addr; 694 695 addr = ipvlan_find_addr(ipvlan, ip6_addr, true); 696 if (!addr) 697 return; 698 699 ipvlan_ht_addr_del(addr); 700 list_del(&addr->anode); 701 kfree_rcu(addr, rcu); 702 703 return; 704 } 705 706 static int ipvlan_addr6_event(struct notifier_block *unused, 707 unsigned long event, void *ptr) 708 { 709 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr; 710 struct net_device *dev = (struct net_device *)if6->idev->dev; 711 struct ipvl_dev *ipvlan = netdev_priv(dev); 712 713 /* FIXME IPv6 autoconf calls us from bh without RTNL */ 714 if (in_softirq()) 715 return NOTIFY_DONE; 716 717 if (!netif_is_ipvlan(dev)) 718 return NOTIFY_DONE; 719 720 if (!ipvlan || !ipvlan->port) 721 return NOTIFY_DONE; 722 723 switch (event) { 724 case NETDEV_UP: 725 if (ipvlan_add_addr6(ipvlan, &if6->addr)) 726 return NOTIFY_BAD; 727 break; 728 729 case NETDEV_DOWN: 730 ipvlan_del_addr6(ipvlan, &if6->addr); 731 break; 732 } 733 734 return NOTIFY_OK; 735 } 736 737 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 738 { 739 struct ipvl_addr *addr; 740 741 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false)) { 742 netif_err(ipvlan, ifup, ipvlan->dev, 743 "Failed to add IPv4=%pI4 on %s intf.\n", 744 ip4_addr, ipvlan->dev->name); 745 return -EINVAL; 746 } 747 addr = kzalloc(sizeof(struct ipvl_addr), GFP_KERNEL); 748 if (!addr) 749 return -ENOMEM; 750 751 addr->master = ipvlan; 752 memcpy(&addr->ip4addr, ip4_addr, sizeof(struct in_addr)); 753 addr->atype = IPVL_IPV4; 754 list_add_tail(&addr->anode, &ipvlan->addrs); 755 756 /* If the interface is not up, the address will be added to the hash 757 * list by ipvlan_open. 758 */ 759 if (netif_running(ipvlan->dev)) 760 ipvlan_ht_addr_add(ipvlan, addr); 761 762 return 0; 763 } 764 765 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 766 { 767 struct ipvl_addr *addr; 768 769 addr = ipvlan_find_addr(ipvlan, ip4_addr, false); 770 if (!addr) 771 return; 772 773 ipvlan_ht_addr_del(addr); 774 list_del(&addr->anode); 775 kfree_rcu(addr, rcu); 776 777 return; 778 } 779 780 static int ipvlan_addr4_event(struct notifier_block *unused, 781 unsigned long event, void *ptr) 782 { 783 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr; 784 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev; 785 struct ipvl_dev *ipvlan = netdev_priv(dev); 786 struct in_addr ip4_addr; 787 788 if (!netif_is_ipvlan(dev)) 789 return NOTIFY_DONE; 790 791 if (!ipvlan || !ipvlan->port) 792 return NOTIFY_DONE; 793 794 switch (event) { 795 case NETDEV_UP: 796 ip4_addr.s_addr = if4->ifa_address; 797 if (ipvlan_add_addr4(ipvlan, &ip4_addr)) 798 return NOTIFY_BAD; 799 break; 800 801 case NETDEV_DOWN: 802 ip4_addr.s_addr = if4->ifa_address; 803 ipvlan_del_addr4(ipvlan, &ip4_addr); 804 break; 805 } 806 807 return NOTIFY_OK; 808 } 809 810 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = { 811 .notifier_call = ipvlan_addr4_event, 812 }; 813 814 static struct notifier_block ipvlan_notifier_block __read_mostly = { 815 .notifier_call = ipvlan_device_event, 816 }; 817 818 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = { 819 .notifier_call = ipvlan_addr6_event, 820 }; 821 822 static int __init ipvlan_init_module(void) 823 { 824 int err; 825 826 ipvlan_init_secret(); 827 register_netdevice_notifier(&ipvlan_notifier_block); 828 register_inet6addr_notifier(&ipvlan_addr6_notifier_block); 829 register_inetaddr_notifier(&ipvlan_addr4_notifier_block); 830 831 err = ipvlan_link_register(&ipvlan_link_ops); 832 if (err < 0) 833 goto error; 834 835 return 0; 836 error: 837 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block); 838 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block); 839 unregister_netdevice_notifier(&ipvlan_notifier_block); 840 return err; 841 } 842 843 static void __exit ipvlan_cleanup_module(void) 844 { 845 rtnl_link_unregister(&ipvlan_link_ops); 846 unregister_netdevice_notifier(&ipvlan_notifier_block); 847 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block); 848 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block); 849 } 850 851 module_init(ipvlan_init_module); 852 module_exit(ipvlan_cleanup_module); 853 854 MODULE_LICENSE("GPL"); 855 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>"); 856 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs"); 857 MODULE_ALIAS_RTNL_LINK("ipvlan"); 858