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 const struct l3mdev_ops ipvl_l3mdev_ops = { 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; 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 (netdev_is_rx_handler_busy(dev)) { 106 netdev_err(dev, "Device is already in use.\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 ida_init(&port->ida); 123 port->dev_id_start = 1; 124 125 err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port); 126 if (err) 127 goto err; 128 129 dev->priv_flags |= IFF_IPVLAN_MASTER; 130 return 0; 131 132 err: 133 kfree(port); 134 return err; 135 } 136 137 static void ipvlan_port_destroy(struct net_device *dev) 138 { 139 struct ipvl_port *port = ipvlan_port_get_rtnl(dev); 140 struct sk_buff *skb; 141 142 dev->priv_flags &= ~IFF_IPVLAN_MASTER; 143 if (port->mode == IPVLAN_MODE_L3S) { 144 dev->priv_flags &= ~IFF_L3MDEV_MASTER; 145 ipvlan_unregister_nf_hook(); 146 dev->l3mdev_ops = NULL; 147 } 148 netdev_rx_handler_unregister(dev); 149 cancel_work_sync(&port->wq); 150 while ((skb = __skb_dequeue(&port->backlog)) != NULL) { 151 if (skb->dev) 152 dev_put(skb->dev); 153 kfree_skb(skb); 154 } 155 ida_destroy(&port->ida); 156 kfree(port); 157 } 158 159 #define IPVLAN_FEATURES \ 160 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 161 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \ 162 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 163 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 164 165 #define IPVLAN_STATE_MASK \ 166 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 167 168 static int ipvlan_init(struct net_device *dev) 169 { 170 struct ipvl_dev *ipvlan = netdev_priv(dev); 171 const struct net_device *phy_dev = ipvlan->phy_dev; 172 struct ipvl_port *port = ipvlan->port; 173 174 dev->state = (dev->state & ~IPVLAN_STATE_MASK) | 175 (phy_dev->state & IPVLAN_STATE_MASK); 176 dev->features = phy_dev->features & IPVLAN_FEATURES; 177 dev->features |= NETIF_F_LLTX; 178 dev->gso_max_size = phy_dev->gso_max_size; 179 dev->gso_max_segs = phy_dev->gso_max_segs; 180 dev->hard_header_len = phy_dev->hard_header_len; 181 182 netdev_lockdep_set_classes(dev); 183 184 ipvlan->pcpu_stats = alloc_percpu(struct ipvl_pcpu_stats); 185 if (!ipvlan->pcpu_stats) 186 return -ENOMEM; 187 188 port->count += 1; 189 190 return 0; 191 } 192 193 static void ipvlan_uninit(struct net_device *dev) 194 { 195 struct ipvl_dev *ipvlan = netdev_priv(dev); 196 struct ipvl_port *port = ipvlan->port; 197 198 free_percpu(ipvlan->pcpu_stats); 199 200 port->count -= 1; 201 if (!port->count) 202 ipvlan_port_destroy(port->dev); 203 } 204 205 static int ipvlan_open(struct net_device *dev) 206 { 207 struct ipvl_dev *ipvlan = netdev_priv(dev); 208 struct net_device *phy_dev = ipvlan->phy_dev; 209 struct ipvl_addr *addr; 210 211 if (ipvlan->port->mode == IPVLAN_MODE_L3 || 212 ipvlan->port->mode == IPVLAN_MODE_L3S) 213 dev->flags |= IFF_NOARP; 214 else 215 dev->flags &= ~IFF_NOARP; 216 217 list_for_each_entry(addr, &ipvlan->addrs, anode) 218 ipvlan_ht_addr_add(ipvlan, addr); 219 220 return dev_uc_add(phy_dev, phy_dev->dev_addr); 221 } 222 223 static int ipvlan_stop(struct net_device *dev) 224 { 225 struct ipvl_dev *ipvlan = netdev_priv(dev); 226 struct net_device *phy_dev = ipvlan->phy_dev; 227 struct ipvl_addr *addr; 228 229 dev_uc_unsync(phy_dev, dev); 230 dev_mc_unsync(phy_dev, dev); 231 232 dev_uc_del(phy_dev, phy_dev->dev_addr); 233 234 list_for_each_entry(addr, &ipvlan->addrs, anode) 235 ipvlan_ht_addr_del(addr); 236 237 return 0; 238 } 239 240 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb, 241 struct net_device *dev) 242 { 243 const struct ipvl_dev *ipvlan = netdev_priv(dev); 244 int skblen = skb->len; 245 int ret; 246 247 ret = ipvlan_queue_xmit(skb, dev); 248 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 249 struct ipvl_pcpu_stats *pcptr; 250 251 pcptr = this_cpu_ptr(ipvlan->pcpu_stats); 252 253 u64_stats_update_begin(&pcptr->syncp); 254 pcptr->tx_pkts++; 255 pcptr->tx_bytes += skblen; 256 u64_stats_update_end(&pcptr->syncp); 257 } else { 258 this_cpu_inc(ipvlan->pcpu_stats->tx_drps); 259 } 260 return ret; 261 } 262 263 static netdev_features_t ipvlan_fix_features(struct net_device *dev, 264 netdev_features_t features) 265 { 266 struct ipvl_dev *ipvlan = netdev_priv(dev); 267 268 return features & (ipvlan->sfeatures | ~IPVLAN_FEATURES); 269 } 270 271 static void ipvlan_change_rx_flags(struct net_device *dev, int change) 272 { 273 struct ipvl_dev *ipvlan = netdev_priv(dev); 274 struct net_device *phy_dev = ipvlan->phy_dev; 275 276 if (change & IFF_ALLMULTI) 277 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1); 278 } 279 280 static void ipvlan_set_multicast_mac_filter(struct net_device *dev) 281 { 282 struct ipvl_dev *ipvlan = netdev_priv(dev); 283 284 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 285 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE); 286 } else { 287 struct netdev_hw_addr *ha; 288 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE); 289 290 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE); 291 netdev_for_each_mc_addr(ha, dev) 292 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters); 293 294 /* Turn-on broadcast bit irrespective of address family, 295 * since broadcast is deferred to a work-queue, hence no 296 * impact on fast-path processing. 297 */ 298 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters); 299 300 bitmap_copy(ipvlan->mac_filters, mc_filters, 301 IPVLAN_MAC_FILTER_SIZE); 302 } 303 dev_uc_sync(ipvlan->phy_dev, dev); 304 dev_mc_sync(ipvlan->phy_dev, dev); 305 } 306 307 static void ipvlan_get_stats64(struct net_device *dev, 308 struct rtnl_link_stats64 *s) 309 { 310 struct ipvl_dev *ipvlan = netdev_priv(dev); 311 312 if (ipvlan->pcpu_stats) { 313 struct ipvl_pcpu_stats *pcptr; 314 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes; 315 u32 rx_errs = 0, tx_drps = 0; 316 u32 strt; 317 int idx; 318 319 for_each_possible_cpu(idx) { 320 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx); 321 do { 322 strt= u64_stats_fetch_begin_irq(&pcptr->syncp); 323 rx_pkts = pcptr->rx_pkts; 324 rx_bytes = pcptr->rx_bytes; 325 rx_mcast = pcptr->rx_mcast; 326 tx_pkts = pcptr->tx_pkts; 327 tx_bytes = pcptr->tx_bytes; 328 } while (u64_stats_fetch_retry_irq(&pcptr->syncp, 329 strt)); 330 331 s->rx_packets += rx_pkts; 332 s->rx_bytes += rx_bytes; 333 s->multicast += rx_mcast; 334 s->tx_packets += tx_pkts; 335 s->tx_bytes += tx_bytes; 336 337 /* u32 values are updated without syncp protection. */ 338 rx_errs += pcptr->rx_errs; 339 tx_drps += pcptr->tx_drps; 340 } 341 s->rx_errors = rx_errs; 342 s->rx_dropped = rx_errs; 343 s->tx_dropped = tx_drps; 344 } 345 } 346 347 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid) 348 { 349 struct ipvl_dev *ipvlan = netdev_priv(dev); 350 struct net_device *phy_dev = ipvlan->phy_dev; 351 352 return vlan_vid_add(phy_dev, proto, vid); 353 } 354 355 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto, 356 u16 vid) 357 { 358 struct ipvl_dev *ipvlan = netdev_priv(dev); 359 struct net_device *phy_dev = ipvlan->phy_dev; 360 361 vlan_vid_del(phy_dev, proto, vid); 362 return 0; 363 } 364 365 static int ipvlan_get_iflink(const struct net_device *dev) 366 { 367 struct ipvl_dev *ipvlan = netdev_priv(dev); 368 369 return ipvlan->phy_dev->ifindex; 370 } 371 372 static const struct net_device_ops ipvlan_netdev_ops = { 373 .ndo_init = ipvlan_init, 374 .ndo_uninit = ipvlan_uninit, 375 .ndo_open = ipvlan_open, 376 .ndo_stop = ipvlan_stop, 377 .ndo_start_xmit = ipvlan_start_xmit, 378 .ndo_fix_features = ipvlan_fix_features, 379 .ndo_change_rx_flags = ipvlan_change_rx_flags, 380 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter, 381 .ndo_get_stats64 = ipvlan_get_stats64, 382 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid, 383 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid, 384 .ndo_get_iflink = ipvlan_get_iflink, 385 }; 386 387 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 388 unsigned short type, const void *daddr, 389 const void *saddr, unsigned len) 390 { 391 const struct ipvl_dev *ipvlan = netdev_priv(dev); 392 struct net_device *phy_dev = ipvlan->phy_dev; 393 394 /* TODO Probably use a different field than dev_addr so that the 395 * mac-address on the virtual device is portable and can be carried 396 * while the packets use the mac-addr on the physical device. 397 */ 398 return dev_hard_header(skb, phy_dev, type, daddr, 399 saddr ? : dev->dev_addr, len); 400 } 401 402 static const struct header_ops ipvlan_header_ops = { 403 .create = ipvlan_hard_header, 404 .parse = eth_header_parse, 405 .cache = eth_header_cache, 406 .cache_update = eth_header_cache_update, 407 }; 408 409 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev, 410 struct ethtool_link_ksettings *cmd) 411 { 412 const struct ipvl_dev *ipvlan = netdev_priv(dev); 413 414 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd); 415 } 416 417 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev, 418 struct ethtool_drvinfo *drvinfo) 419 { 420 strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver)); 421 strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version)); 422 } 423 424 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev) 425 { 426 const struct ipvl_dev *ipvlan = netdev_priv(dev); 427 428 return ipvlan->msg_enable; 429 } 430 431 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value) 432 { 433 struct ipvl_dev *ipvlan = netdev_priv(dev); 434 435 ipvlan->msg_enable = value; 436 } 437 438 static const struct ethtool_ops ipvlan_ethtool_ops = { 439 .get_link = ethtool_op_get_link, 440 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings, 441 .get_drvinfo = ipvlan_ethtool_get_drvinfo, 442 .get_msglevel = ipvlan_ethtool_get_msglevel, 443 .set_msglevel = ipvlan_ethtool_set_msglevel, 444 }; 445 446 static int ipvlan_nl_changelink(struct net_device *dev, 447 struct nlattr *tb[], struct nlattr *data[]) 448 { 449 struct ipvl_dev *ipvlan = netdev_priv(dev); 450 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 451 int err = 0; 452 453 if (data && data[IFLA_IPVLAN_MODE]) { 454 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 455 456 err = ipvlan_set_port_mode(port, nmode); 457 } 458 return err; 459 } 460 461 static size_t ipvlan_nl_getsize(const struct net_device *dev) 462 { 463 return (0 464 + nla_total_size(2) /* IFLA_IPVLAN_MODE */ 465 ); 466 } 467 468 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[]) 469 { 470 if (data && data[IFLA_IPVLAN_MODE]) { 471 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 472 473 if (mode < IPVLAN_MODE_L2 || mode >= IPVLAN_MODE_MAX) 474 return -EINVAL; 475 } 476 return 0; 477 } 478 479 static int ipvlan_nl_fillinfo(struct sk_buff *skb, 480 const struct net_device *dev) 481 { 482 struct ipvl_dev *ipvlan = netdev_priv(dev); 483 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 484 int ret = -EINVAL; 485 486 if (!port) 487 goto err; 488 489 ret = -EMSGSIZE; 490 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode)) 491 goto err; 492 493 return 0; 494 495 err: 496 return ret; 497 } 498 499 static int ipvlan_link_new(struct net *src_net, struct net_device *dev, 500 struct nlattr *tb[], struct nlattr *data[]) 501 { 502 struct ipvl_dev *ipvlan = netdev_priv(dev); 503 struct ipvl_port *port; 504 struct net_device *phy_dev; 505 int err; 506 u16 mode = IPVLAN_MODE_L3; 507 bool create = false; 508 509 if (!tb[IFLA_LINK]) 510 return -EINVAL; 511 512 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 513 if (!phy_dev) 514 return -ENODEV; 515 516 if (netif_is_ipvlan(phy_dev)) { 517 struct ipvl_dev *tmp = netdev_priv(phy_dev); 518 519 phy_dev = tmp->phy_dev; 520 } else if (!netif_is_ipvlan_port(phy_dev)) { 521 err = ipvlan_port_create(phy_dev); 522 if (err < 0) 523 return err; 524 create = true; 525 } 526 527 if (data && data[IFLA_IPVLAN_MODE]) 528 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 529 530 port = ipvlan_port_get_rtnl(phy_dev); 531 ipvlan->phy_dev = phy_dev; 532 ipvlan->dev = dev; 533 ipvlan->port = port; 534 ipvlan->sfeatures = IPVLAN_FEATURES; 535 ipvlan_adjust_mtu(ipvlan, phy_dev); 536 INIT_LIST_HEAD(&ipvlan->addrs); 537 538 /* If the port-id base is at the MAX value, then wrap it around and 539 * begin from 0x1 again. This may be due to a busy system where lots 540 * of slaves are getting created and deleted. 541 */ 542 if (port->dev_id_start == 0xFFFE) 543 port->dev_id_start = 0x1; 544 545 /* Since L2 address is shared among all IPvlan slaves including 546 * master, use unique 16 bit dev-ids to diffentiate among them. 547 * Assign IDs between 0x1 and 0xFFFE (used by the master) to each 548 * slave link [see addrconf_ifid_eui48()]. 549 */ 550 err = ida_simple_get(&port->ida, port->dev_id_start, 0xFFFE, 551 GFP_KERNEL); 552 if (err < 0) 553 err = ida_simple_get(&port->ida, 0x1, port->dev_id_start, 554 GFP_KERNEL); 555 if (err < 0) 556 goto destroy_ipvlan_port; 557 dev->dev_id = err; 558 /* Increment id-base to the next slot for the future assignment */ 559 port->dev_id_start = err + 1; 560 561 /* TODO Probably put random address here to be presented to the 562 * world but keep using the physical-dev address for the outgoing 563 * packets. 564 */ 565 memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN); 566 567 dev->priv_flags |= IFF_IPVLAN_SLAVE; 568 569 err = register_netdevice(dev); 570 if (err < 0) 571 goto remove_ida; 572 573 err = netdev_upper_dev_link(phy_dev, dev); 574 if (err) { 575 goto unregister_netdev; 576 } 577 err = ipvlan_set_port_mode(port, mode); 578 if (err) { 579 goto unlink_netdev; 580 } 581 582 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans); 583 netif_stacked_transfer_operstate(phy_dev, dev); 584 return 0; 585 586 unlink_netdev: 587 netdev_upper_dev_unlink(phy_dev, dev); 588 unregister_netdev: 589 unregister_netdevice(dev); 590 remove_ida: 591 ida_simple_remove(&port->ida, dev->dev_id); 592 destroy_ipvlan_port: 593 if (create) 594 ipvlan_port_destroy(phy_dev); 595 return err; 596 } 597 598 static void ipvlan_link_delete(struct net_device *dev, struct list_head *head) 599 { 600 struct ipvl_dev *ipvlan = netdev_priv(dev); 601 struct ipvl_addr *addr, *next; 602 603 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) { 604 ipvlan_ht_addr_del(addr); 605 list_del(&addr->anode); 606 kfree_rcu(addr, rcu); 607 } 608 609 ida_simple_remove(&ipvlan->port->ida, dev->dev_id); 610 list_del_rcu(&ipvlan->pnode); 611 unregister_netdevice_queue(dev, head); 612 netdev_upper_dev_unlink(ipvlan->phy_dev, dev); 613 } 614 615 static void ipvlan_link_setup(struct net_device *dev) 616 { 617 ether_setup(dev); 618 619 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 620 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE; 621 dev->netdev_ops = &ipvlan_netdev_ops; 622 dev->destructor = free_netdev; 623 dev->header_ops = &ipvlan_header_ops; 624 dev->ethtool_ops = &ipvlan_ethtool_ops; 625 } 626 627 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] = 628 { 629 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 }, 630 }; 631 632 static struct rtnl_link_ops ipvlan_link_ops = { 633 .kind = "ipvlan", 634 .priv_size = sizeof(struct ipvl_dev), 635 636 .get_size = ipvlan_nl_getsize, 637 .policy = ipvlan_nl_policy, 638 .validate = ipvlan_nl_validate, 639 .fill_info = ipvlan_nl_fillinfo, 640 .changelink = ipvlan_nl_changelink, 641 .maxtype = IFLA_IPVLAN_MAX, 642 643 .setup = ipvlan_link_setup, 644 .newlink = ipvlan_link_new, 645 .dellink = ipvlan_link_delete, 646 }; 647 648 static int ipvlan_link_register(struct rtnl_link_ops *ops) 649 { 650 return rtnl_link_register(ops); 651 } 652 653 static int ipvlan_device_event(struct notifier_block *unused, 654 unsigned long event, void *ptr) 655 { 656 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 657 struct ipvl_dev *ipvlan, *next; 658 struct ipvl_port *port; 659 LIST_HEAD(lst_kill); 660 661 if (!netif_is_ipvlan_port(dev)) 662 return NOTIFY_DONE; 663 664 port = ipvlan_port_get_rtnl(dev); 665 666 switch (event) { 667 case NETDEV_CHANGE: 668 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 669 netif_stacked_transfer_operstate(ipvlan->phy_dev, 670 ipvlan->dev); 671 break; 672 673 case NETDEV_UNREGISTER: 674 if (dev->reg_state != NETREG_UNREGISTERING) 675 break; 676 677 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, 678 pnode) 679 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev, 680 &lst_kill); 681 unregister_netdevice_many(&lst_kill); 682 break; 683 684 case NETDEV_FEAT_CHANGE: 685 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 686 ipvlan->dev->features = dev->features & IPVLAN_FEATURES; 687 ipvlan->dev->gso_max_size = dev->gso_max_size; 688 ipvlan->dev->gso_max_segs = dev->gso_max_segs; 689 netdev_features_change(ipvlan->dev); 690 } 691 break; 692 693 case NETDEV_CHANGEMTU: 694 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 695 ipvlan_adjust_mtu(ipvlan, dev); 696 break; 697 698 case NETDEV_PRE_TYPE_CHANGE: 699 /* Forbid underlying device to change its type. */ 700 return NOTIFY_BAD; 701 } 702 return NOTIFY_DONE; 703 } 704 705 static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6) 706 { 707 struct ipvl_addr *addr; 708 709 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC); 710 if (!addr) 711 return -ENOMEM; 712 713 addr->master = ipvlan; 714 if (is_v6) { 715 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr)); 716 addr->atype = IPVL_IPV6; 717 } else { 718 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr)); 719 addr->atype = IPVL_IPV4; 720 } 721 list_add_tail(&addr->anode, &ipvlan->addrs); 722 723 /* If the interface is not up, the address will be added to the hash 724 * list by ipvlan_open. 725 */ 726 if (netif_running(ipvlan->dev)) 727 ipvlan_ht_addr_add(ipvlan, addr); 728 729 return 0; 730 } 731 732 static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6) 733 { 734 struct ipvl_addr *addr; 735 736 addr = ipvlan_find_addr(ipvlan, iaddr, is_v6); 737 if (!addr) 738 return; 739 740 ipvlan_ht_addr_del(addr); 741 list_del(&addr->anode); 742 kfree_rcu(addr, rcu); 743 744 return; 745 } 746 747 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 748 { 749 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true)) { 750 netif_err(ipvlan, ifup, ipvlan->dev, 751 "Failed to add IPv6=%pI6c addr for %s intf\n", 752 ip6_addr, ipvlan->dev->name); 753 return -EINVAL; 754 } 755 756 return ipvlan_add_addr(ipvlan, ip6_addr, true); 757 } 758 759 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 760 { 761 return ipvlan_del_addr(ipvlan, ip6_addr, true); 762 } 763 764 static int ipvlan_addr6_event(struct notifier_block *unused, 765 unsigned long event, void *ptr) 766 { 767 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr; 768 struct net_device *dev = (struct net_device *)if6->idev->dev; 769 struct ipvl_dev *ipvlan = netdev_priv(dev); 770 771 /* FIXME IPv6 autoconf calls us from bh without RTNL */ 772 if (in_softirq()) 773 return NOTIFY_DONE; 774 775 if (!netif_is_ipvlan(dev)) 776 return NOTIFY_DONE; 777 778 if (!ipvlan || !ipvlan->port) 779 return NOTIFY_DONE; 780 781 switch (event) { 782 case NETDEV_UP: 783 if (ipvlan_add_addr6(ipvlan, &if6->addr)) 784 return NOTIFY_BAD; 785 break; 786 787 case NETDEV_DOWN: 788 ipvlan_del_addr6(ipvlan, &if6->addr); 789 break; 790 } 791 792 return NOTIFY_OK; 793 } 794 795 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 796 { 797 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false)) { 798 netif_err(ipvlan, ifup, ipvlan->dev, 799 "Failed to add IPv4=%pI4 on %s intf.\n", 800 ip4_addr, ipvlan->dev->name); 801 return -EINVAL; 802 } 803 804 return ipvlan_add_addr(ipvlan, ip4_addr, false); 805 } 806 807 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 808 { 809 return ipvlan_del_addr(ipvlan, ip4_addr, false); 810 } 811 812 static int ipvlan_addr4_event(struct notifier_block *unused, 813 unsigned long event, void *ptr) 814 { 815 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr; 816 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev; 817 struct ipvl_dev *ipvlan = netdev_priv(dev); 818 struct in_addr ip4_addr; 819 820 if (!netif_is_ipvlan(dev)) 821 return NOTIFY_DONE; 822 823 if (!ipvlan || !ipvlan->port) 824 return NOTIFY_DONE; 825 826 switch (event) { 827 case NETDEV_UP: 828 ip4_addr.s_addr = if4->ifa_address; 829 if (ipvlan_add_addr4(ipvlan, &ip4_addr)) 830 return NOTIFY_BAD; 831 break; 832 833 case NETDEV_DOWN: 834 ip4_addr.s_addr = if4->ifa_address; 835 ipvlan_del_addr4(ipvlan, &ip4_addr); 836 break; 837 } 838 839 return NOTIFY_OK; 840 } 841 842 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = { 843 .notifier_call = ipvlan_addr4_event, 844 }; 845 846 static struct notifier_block ipvlan_notifier_block __read_mostly = { 847 .notifier_call = ipvlan_device_event, 848 }; 849 850 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = { 851 .notifier_call = ipvlan_addr6_event, 852 }; 853 854 static int __init ipvlan_init_module(void) 855 { 856 int err; 857 858 ipvlan_init_secret(); 859 register_netdevice_notifier(&ipvlan_notifier_block); 860 register_inet6addr_notifier(&ipvlan_addr6_notifier_block); 861 register_inetaddr_notifier(&ipvlan_addr4_notifier_block); 862 863 err = ipvlan_link_register(&ipvlan_link_ops); 864 if (err < 0) 865 goto error; 866 867 return 0; 868 error: 869 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block); 870 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block); 871 unregister_netdevice_notifier(&ipvlan_notifier_block); 872 return err; 873 } 874 875 static void __exit ipvlan_cleanup_module(void) 876 { 877 rtnl_link_unregister(&ipvlan_link_ops); 878 unregister_netdevice_notifier(&ipvlan_notifier_block); 879 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block); 880 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block); 881 } 882 883 module_init(ipvlan_init_module); 884 module_exit(ipvlan_cleanup_module); 885 886 MODULE_LICENSE("GPL"); 887 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>"); 888 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs"); 889 MODULE_ALIAS_RTNL_LINK("ipvlan"); 890