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 unsigned int ipvlan_netid __read_mostly; 13 14 struct ipvlan_netns { 15 unsigned int ipvl_nf_hook_refcnt; 16 }; 17 18 static struct nf_hook_ops ipvl_nfops[] __read_mostly = { 19 { 20 .hook = ipvlan_nf_input, 21 .pf = NFPROTO_IPV4, 22 .hooknum = NF_INET_LOCAL_IN, 23 .priority = INT_MAX, 24 }, 25 { 26 .hook = ipvlan_nf_input, 27 .pf = NFPROTO_IPV6, 28 .hooknum = NF_INET_LOCAL_IN, 29 .priority = INT_MAX, 30 }, 31 }; 32 33 static const struct l3mdev_ops ipvl_l3mdev_ops = { 34 .l3mdev_l3_rcv = ipvlan_l3_rcv, 35 }; 36 37 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev) 38 { 39 ipvlan->dev->mtu = dev->mtu; 40 } 41 42 static int ipvlan_register_nf_hook(struct net *net) 43 { 44 struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid); 45 int err = 0; 46 47 if (!vnet->ipvl_nf_hook_refcnt) { 48 err = nf_register_net_hooks(net, ipvl_nfops, 49 ARRAY_SIZE(ipvl_nfops)); 50 if (!err) 51 vnet->ipvl_nf_hook_refcnt = 1; 52 } else { 53 vnet->ipvl_nf_hook_refcnt++; 54 } 55 56 return err; 57 } 58 59 static void ipvlan_unregister_nf_hook(struct net *net) 60 { 61 struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid); 62 63 if (WARN_ON(!vnet->ipvl_nf_hook_refcnt)) 64 return; 65 66 vnet->ipvl_nf_hook_refcnt--; 67 if (!vnet->ipvl_nf_hook_refcnt) 68 nf_unregister_net_hooks(net, ipvl_nfops, 69 ARRAY_SIZE(ipvl_nfops)); 70 } 71 72 static int ipvlan_set_port_mode(struct ipvl_port *port, u16 nval) 73 { 74 struct ipvl_dev *ipvlan; 75 struct net_device *mdev = port->dev; 76 int err = 0; 77 78 ASSERT_RTNL(); 79 if (port->mode != nval) { 80 if (nval == IPVLAN_MODE_L3S) { 81 /* New mode is L3S */ 82 err = ipvlan_register_nf_hook(read_pnet(&port->pnet)); 83 if (!err) { 84 mdev->l3mdev_ops = &ipvl_l3mdev_ops; 85 mdev->priv_flags |= IFF_L3MDEV_MASTER; 86 } else 87 return err; 88 } else if (port->mode == IPVLAN_MODE_L3S) { 89 /* Old mode was L3S */ 90 mdev->priv_flags &= ~IFF_L3MDEV_MASTER; 91 ipvlan_unregister_nf_hook(read_pnet(&port->pnet)); 92 mdev->l3mdev_ops = NULL; 93 } 94 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 95 if (nval == IPVLAN_MODE_L3 || nval == IPVLAN_MODE_L3S) 96 ipvlan->dev->flags |= IFF_NOARP; 97 else 98 ipvlan->dev->flags &= ~IFF_NOARP; 99 } 100 port->mode = nval; 101 } 102 return err; 103 } 104 105 static int ipvlan_port_create(struct net_device *dev) 106 { 107 struct ipvl_port *port; 108 int err, idx; 109 110 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) { 111 netdev_err(dev, "Master is either lo or non-ether device\n"); 112 return -EINVAL; 113 } 114 115 if (netdev_is_rx_handler_busy(dev)) { 116 netdev_err(dev, "Device is already in use.\n"); 117 return -EBUSY; 118 } 119 120 port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL); 121 if (!port) 122 return -ENOMEM; 123 124 write_pnet(&port->pnet, dev_net(dev)); 125 port->dev = dev; 126 port->mode = IPVLAN_MODE_L3; 127 INIT_LIST_HEAD(&port->ipvlans); 128 for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++) 129 INIT_HLIST_HEAD(&port->hlhead[idx]); 130 131 skb_queue_head_init(&port->backlog); 132 INIT_WORK(&port->wq, ipvlan_process_multicast); 133 ida_init(&port->ida); 134 port->dev_id_start = 1; 135 136 err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port); 137 if (err) 138 goto err; 139 140 dev->priv_flags |= IFF_IPVLAN_MASTER; 141 return 0; 142 143 err: 144 kfree(port); 145 return err; 146 } 147 148 static void ipvlan_port_destroy(struct net_device *dev) 149 { 150 struct ipvl_port *port = ipvlan_port_get_rtnl(dev); 151 struct sk_buff *skb; 152 153 dev->priv_flags &= ~IFF_IPVLAN_MASTER; 154 if (port->mode == IPVLAN_MODE_L3S) { 155 dev->priv_flags &= ~IFF_L3MDEV_MASTER; 156 ipvlan_unregister_nf_hook(dev_net(dev)); 157 dev->l3mdev_ops = NULL; 158 } 159 netdev_rx_handler_unregister(dev); 160 cancel_work_sync(&port->wq); 161 while ((skb = __skb_dequeue(&port->backlog)) != NULL) { 162 if (skb->dev) 163 dev_put(skb->dev); 164 kfree_skb(skb); 165 } 166 ida_destroy(&port->ida); 167 kfree(port); 168 } 169 170 #define IPVLAN_FEATURES \ 171 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 172 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \ 173 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 174 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 175 176 #define IPVLAN_STATE_MASK \ 177 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 178 179 static int ipvlan_init(struct net_device *dev) 180 { 181 struct ipvl_dev *ipvlan = netdev_priv(dev); 182 const struct net_device *phy_dev = ipvlan->phy_dev; 183 struct ipvl_port *port = ipvlan->port; 184 185 dev->state = (dev->state & ~IPVLAN_STATE_MASK) | 186 (phy_dev->state & IPVLAN_STATE_MASK); 187 dev->features = phy_dev->features & IPVLAN_FEATURES; 188 dev->features |= NETIF_F_LLTX; 189 dev->gso_max_size = phy_dev->gso_max_size; 190 dev->gso_max_segs = phy_dev->gso_max_segs; 191 dev->hard_header_len = phy_dev->hard_header_len; 192 193 netdev_lockdep_set_classes(dev); 194 195 ipvlan->pcpu_stats = alloc_percpu(struct ipvl_pcpu_stats); 196 if (!ipvlan->pcpu_stats) 197 return -ENOMEM; 198 199 port->count += 1; 200 201 return 0; 202 } 203 204 static void ipvlan_uninit(struct net_device *dev) 205 { 206 struct ipvl_dev *ipvlan = netdev_priv(dev); 207 struct ipvl_port *port = ipvlan->port; 208 209 free_percpu(ipvlan->pcpu_stats); 210 211 port->count -= 1; 212 if (!port->count) 213 ipvlan_port_destroy(port->dev); 214 } 215 216 static int ipvlan_open(struct net_device *dev) 217 { 218 struct ipvl_dev *ipvlan = netdev_priv(dev); 219 struct net_device *phy_dev = ipvlan->phy_dev; 220 struct ipvl_addr *addr; 221 222 if (ipvlan->port->mode == IPVLAN_MODE_L3 || 223 ipvlan->port->mode == IPVLAN_MODE_L3S) 224 dev->flags |= IFF_NOARP; 225 else 226 dev->flags &= ~IFF_NOARP; 227 228 list_for_each_entry(addr, &ipvlan->addrs, anode) 229 ipvlan_ht_addr_add(ipvlan, addr); 230 231 return dev_uc_add(phy_dev, phy_dev->dev_addr); 232 } 233 234 static int ipvlan_stop(struct net_device *dev) 235 { 236 struct ipvl_dev *ipvlan = netdev_priv(dev); 237 struct net_device *phy_dev = ipvlan->phy_dev; 238 struct ipvl_addr *addr; 239 240 dev_uc_unsync(phy_dev, dev); 241 dev_mc_unsync(phy_dev, dev); 242 243 dev_uc_del(phy_dev, phy_dev->dev_addr); 244 245 list_for_each_entry(addr, &ipvlan->addrs, anode) 246 ipvlan_ht_addr_del(addr); 247 248 return 0; 249 } 250 251 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb, 252 struct net_device *dev) 253 { 254 const struct ipvl_dev *ipvlan = netdev_priv(dev); 255 int skblen = skb->len; 256 int ret; 257 258 ret = ipvlan_queue_xmit(skb, dev); 259 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 260 struct ipvl_pcpu_stats *pcptr; 261 262 pcptr = this_cpu_ptr(ipvlan->pcpu_stats); 263 264 u64_stats_update_begin(&pcptr->syncp); 265 pcptr->tx_pkts++; 266 pcptr->tx_bytes += skblen; 267 u64_stats_update_end(&pcptr->syncp); 268 } else { 269 this_cpu_inc(ipvlan->pcpu_stats->tx_drps); 270 } 271 return ret; 272 } 273 274 static netdev_features_t ipvlan_fix_features(struct net_device *dev, 275 netdev_features_t features) 276 { 277 struct ipvl_dev *ipvlan = netdev_priv(dev); 278 279 return features & (ipvlan->sfeatures | ~IPVLAN_FEATURES); 280 } 281 282 static void ipvlan_change_rx_flags(struct net_device *dev, int change) 283 { 284 struct ipvl_dev *ipvlan = netdev_priv(dev); 285 struct net_device *phy_dev = ipvlan->phy_dev; 286 287 if (change & IFF_ALLMULTI) 288 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1); 289 } 290 291 static void ipvlan_set_multicast_mac_filter(struct net_device *dev) 292 { 293 struct ipvl_dev *ipvlan = netdev_priv(dev); 294 295 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 296 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE); 297 } else { 298 struct netdev_hw_addr *ha; 299 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE); 300 301 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE); 302 netdev_for_each_mc_addr(ha, dev) 303 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters); 304 305 /* Turn-on broadcast bit irrespective of address family, 306 * since broadcast is deferred to a work-queue, hence no 307 * impact on fast-path processing. 308 */ 309 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters); 310 311 bitmap_copy(ipvlan->mac_filters, mc_filters, 312 IPVLAN_MAC_FILTER_SIZE); 313 } 314 dev_uc_sync(ipvlan->phy_dev, dev); 315 dev_mc_sync(ipvlan->phy_dev, dev); 316 } 317 318 static void ipvlan_get_stats64(struct net_device *dev, 319 struct rtnl_link_stats64 *s) 320 { 321 struct ipvl_dev *ipvlan = netdev_priv(dev); 322 323 if (ipvlan->pcpu_stats) { 324 struct ipvl_pcpu_stats *pcptr; 325 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes; 326 u32 rx_errs = 0, tx_drps = 0; 327 u32 strt; 328 int idx; 329 330 for_each_possible_cpu(idx) { 331 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx); 332 do { 333 strt= u64_stats_fetch_begin_irq(&pcptr->syncp); 334 rx_pkts = pcptr->rx_pkts; 335 rx_bytes = pcptr->rx_bytes; 336 rx_mcast = pcptr->rx_mcast; 337 tx_pkts = pcptr->tx_pkts; 338 tx_bytes = pcptr->tx_bytes; 339 } while (u64_stats_fetch_retry_irq(&pcptr->syncp, 340 strt)); 341 342 s->rx_packets += rx_pkts; 343 s->rx_bytes += rx_bytes; 344 s->multicast += rx_mcast; 345 s->tx_packets += tx_pkts; 346 s->tx_bytes += tx_bytes; 347 348 /* u32 values are updated without syncp protection. */ 349 rx_errs += pcptr->rx_errs; 350 tx_drps += pcptr->tx_drps; 351 } 352 s->rx_errors = rx_errs; 353 s->rx_dropped = rx_errs; 354 s->tx_dropped = tx_drps; 355 } 356 } 357 358 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid) 359 { 360 struct ipvl_dev *ipvlan = netdev_priv(dev); 361 struct net_device *phy_dev = ipvlan->phy_dev; 362 363 return vlan_vid_add(phy_dev, proto, vid); 364 } 365 366 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto, 367 u16 vid) 368 { 369 struct ipvl_dev *ipvlan = netdev_priv(dev); 370 struct net_device *phy_dev = ipvlan->phy_dev; 371 372 vlan_vid_del(phy_dev, proto, vid); 373 return 0; 374 } 375 376 static int ipvlan_get_iflink(const struct net_device *dev) 377 { 378 struct ipvl_dev *ipvlan = netdev_priv(dev); 379 380 return ipvlan->phy_dev->ifindex; 381 } 382 383 static const struct net_device_ops ipvlan_netdev_ops = { 384 .ndo_init = ipvlan_init, 385 .ndo_uninit = ipvlan_uninit, 386 .ndo_open = ipvlan_open, 387 .ndo_stop = ipvlan_stop, 388 .ndo_start_xmit = ipvlan_start_xmit, 389 .ndo_fix_features = ipvlan_fix_features, 390 .ndo_change_rx_flags = ipvlan_change_rx_flags, 391 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter, 392 .ndo_get_stats64 = ipvlan_get_stats64, 393 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid, 394 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid, 395 .ndo_get_iflink = ipvlan_get_iflink, 396 }; 397 398 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 399 unsigned short type, const void *daddr, 400 const void *saddr, unsigned len) 401 { 402 const struct ipvl_dev *ipvlan = netdev_priv(dev); 403 struct net_device *phy_dev = ipvlan->phy_dev; 404 405 /* TODO Probably use a different field than dev_addr so that the 406 * mac-address on the virtual device is portable and can be carried 407 * while the packets use the mac-addr on the physical device. 408 */ 409 return dev_hard_header(skb, phy_dev, type, daddr, 410 saddr ? : dev->dev_addr, len); 411 } 412 413 static const struct header_ops ipvlan_header_ops = { 414 .create = ipvlan_hard_header, 415 .parse = eth_header_parse, 416 .cache = eth_header_cache, 417 .cache_update = eth_header_cache_update, 418 }; 419 420 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev, 421 struct ethtool_link_ksettings *cmd) 422 { 423 const struct ipvl_dev *ipvlan = netdev_priv(dev); 424 425 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd); 426 } 427 428 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev, 429 struct ethtool_drvinfo *drvinfo) 430 { 431 strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver)); 432 strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version)); 433 } 434 435 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev) 436 { 437 const struct ipvl_dev *ipvlan = netdev_priv(dev); 438 439 return ipvlan->msg_enable; 440 } 441 442 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value) 443 { 444 struct ipvl_dev *ipvlan = netdev_priv(dev); 445 446 ipvlan->msg_enable = value; 447 } 448 449 static const struct ethtool_ops ipvlan_ethtool_ops = { 450 .get_link = ethtool_op_get_link, 451 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings, 452 .get_drvinfo = ipvlan_ethtool_get_drvinfo, 453 .get_msglevel = ipvlan_ethtool_get_msglevel, 454 .set_msglevel = ipvlan_ethtool_set_msglevel, 455 }; 456 457 static int ipvlan_nl_changelink(struct net_device *dev, 458 struct nlattr *tb[], struct nlattr *data[]) 459 { 460 struct ipvl_dev *ipvlan = netdev_priv(dev); 461 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 462 int err = 0; 463 464 if (data && data[IFLA_IPVLAN_MODE]) { 465 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 466 467 err = ipvlan_set_port_mode(port, nmode); 468 } 469 return err; 470 } 471 472 static size_t ipvlan_nl_getsize(const struct net_device *dev) 473 { 474 return (0 475 + nla_total_size(2) /* IFLA_IPVLAN_MODE */ 476 ); 477 } 478 479 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[]) 480 { 481 if (data && data[IFLA_IPVLAN_MODE]) { 482 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 483 484 if (mode < IPVLAN_MODE_L2 || mode >= IPVLAN_MODE_MAX) 485 return -EINVAL; 486 } 487 return 0; 488 } 489 490 static int ipvlan_nl_fillinfo(struct sk_buff *skb, 491 const struct net_device *dev) 492 { 493 struct ipvl_dev *ipvlan = netdev_priv(dev); 494 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 495 int ret = -EINVAL; 496 497 if (!port) 498 goto err; 499 500 ret = -EMSGSIZE; 501 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode)) 502 goto err; 503 504 return 0; 505 506 err: 507 return ret; 508 } 509 510 int ipvlan_link_new(struct net *src_net, struct net_device *dev, 511 struct nlattr *tb[], struct nlattr *data[]) 512 { 513 struct ipvl_dev *ipvlan = netdev_priv(dev); 514 struct ipvl_port *port; 515 struct net_device *phy_dev; 516 int err; 517 u16 mode = IPVLAN_MODE_L3; 518 bool create = false; 519 520 if (!tb[IFLA_LINK]) 521 return -EINVAL; 522 523 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 524 if (!phy_dev) 525 return -ENODEV; 526 527 if (netif_is_ipvlan(phy_dev)) { 528 struct ipvl_dev *tmp = netdev_priv(phy_dev); 529 530 phy_dev = tmp->phy_dev; 531 } else if (!netif_is_ipvlan_port(phy_dev)) { 532 err = ipvlan_port_create(phy_dev); 533 if (err < 0) 534 return err; 535 create = true; 536 } 537 538 if (data && data[IFLA_IPVLAN_MODE]) 539 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 540 541 port = ipvlan_port_get_rtnl(phy_dev); 542 ipvlan->phy_dev = phy_dev; 543 ipvlan->dev = dev; 544 ipvlan->port = port; 545 ipvlan->sfeatures = IPVLAN_FEATURES; 546 ipvlan_adjust_mtu(ipvlan, phy_dev); 547 INIT_LIST_HEAD(&ipvlan->addrs); 548 549 /* If the port-id base is at the MAX value, then wrap it around and 550 * begin from 0x1 again. This may be due to a busy system where lots 551 * of slaves are getting created and deleted. 552 */ 553 if (port->dev_id_start == 0xFFFE) 554 port->dev_id_start = 0x1; 555 556 /* Since L2 address is shared among all IPvlan slaves including 557 * master, use unique 16 bit dev-ids to diffentiate among them. 558 * Assign IDs between 0x1 and 0xFFFE (used by the master) to each 559 * slave link [see addrconf_ifid_eui48()]. 560 */ 561 err = ida_simple_get(&port->ida, port->dev_id_start, 0xFFFE, 562 GFP_KERNEL); 563 if (err < 0) 564 err = ida_simple_get(&port->ida, 0x1, port->dev_id_start, 565 GFP_KERNEL); 566 if (err < 0) 567 goto destroy_ipvlan_port; 568 dev->dev_id = err; 569 /* Increment id-base to the next slot for the future assignment */ 570 port->dev_id_start = err + 1; 571 572 /* TODO Probably put random address here to be presented to the 573 * world but keep using the physical-dev address for the outgoing 574 * packets. 575 */ 576 memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN); 577 578 dev->priv_flags |= IFF_IPVLAN_SLAVE; 579 580 err = register_netdevice(dev); 581 if (err < 0) 582 goto remove_ida; 583 584 err = netdev_upper_dev_link(phy_dev, dev); 585 if (err) { 586 goto unregister_netdev; 587 } 588 err = ipvlan_set_port_mode(port, mode); 589 if (err) { 590 goto unlink_netdev; 591 } 592 593 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans); 594 netif_stacked_transfer_operstate(phy_dev, dev); 595 return 0; 596 597 unlink_netdev: 598 netdev_upper_dev_unlink(phy_dev, dev); 599 unregister_netdev: 600 unregister_netdevice(dev); 601 remove_ida: 602 ida_simple_remove(&port->ida, dev->dev_id); 603 destroy_ipvlan_port: 604 if (create) 605 ipvlan_port_destroy(phy_dev); 606 return err; 607 } 608 EXPORT_SYMBOL_GPL(ipvlan_link_new); 609 610 void ipvlan_link_delete(struct net_device *dev, struct list_head *head) 611 { 612 struct ipvl_dev *ipvlan = netdev_priv(dev); 613 struct ipvl_addr *addr, *next; 614 615 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) { 616 ipvlan_ht_addr_del(addr); 617 list_del(&addr->anode); 618 kfree_rcu(addr, rcu); 619 } 620 621 ida_simple_remove(&ipvlan->port->ida, dev->dev_id); 622 list_del_rcu(&ipvlan->pnode); 623 unregister_netdevice_queue(dev, head); 624 netdev_upper_dev_unlink(ipvlan->phy_dev, dev); 625 } 626 EXPORT_SYMBOL_GPL(ipvlan_link_delete); 627 628 void ipvlan_link_setup(struct net_device *dev) 629 { 630 ether_setup(dev); 631 632 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 633 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE; 634 dev->netdev_ops = &ipvlan_netdev_ops; 635 dev->destructor = free_netdev; 636 dev->header_ops = &ipvlan_header_ops; 637 dev->ethtool_ops = &ipvlan_ethtool_ops; 638 } 639 EXPORT_SYMBOL_GPL(ipvlan_link_setup); 640 641 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] = 642 { 643 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 }, 644 }; 645 646 static struct rtnl_link_ops ipvlan_link_ops = { 647 .kind = "ipvlan", 648 .priv_size = sizeof(struct ipvl_dev), 649 650 .setup = ipvlan_link_setup, 651 .newlink = ipvlan_link_new, 652 .dellink = ipvlan_link_delete, 653 }; 654 655 int ipvlan_link_register(struct rtnl_link_ops *ops) 656 { 657 ops->get_size = ipvlan_nl_getsize; 658 ops->policy = ipvlan_nl_policy; 659 ops->validate = ipvlan_nl_validate; 660 ops->fill_info = ipvlan_nl_fillinfo; 661 ops->changelink = ipvlan_nl_changelink; 662 ops->maxtype = IFLA_IPVLAN_MAX; 663 return rtnl_link_register(ops); 664 } 665 EXPORT_SYMBOL_GPL(ipvlan_link_register); 666 667 static int ipvlan_device_event(struct notifier_block *unused, 668 unsigned long event, void *ptr) 669 { 670 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 671 struct ipvl_dev *ipvlan, *next; 672 struct ipvl_port *port; 673 LIST_HEAD(lst_kill); 674 675 if (!netif_is_ipvlan_port(dev)) 676 return NOTIFY_DONE; 677 678 port = ipvlan_port_get_rtnl(dev); 679 680 switch (event) { 681 case NETDEV_CHANGE: 682 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 683 netif_stacked_transfer_operstate(ipvlan->phy_dev, 684 ipvlan->dev); 685 break; 686 687 case NETDEV_REGISTER: { 688 struct net *oldnet, *newnet = dev_net(dev); 689 struct ipvlan_netns *old_vnet; 690 691 oldnet = read_pnet(&port->pnet); 692 if (net_eq(newnet, oldnet)) 693 break; 694 695 write_pnet(&port->pnet, newnet); 696 697 old_vnet = net_generic(oldnet, ipvlan_netid); 698 if (!old_vnet->ipvl_nf_hook_refcnt) 699 break; 700 701 ipvlan_register_nf_hook(newnet); 702 ipvlan_unregister_nf_hook(oldnet); 703 break; 704 } 705 case NETDEV_UNREGISTER: 706 if (dev->reg_state != NETREG_UNREGISTERING) 707 break; 708 709 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, 710 pnode) 711 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev, 712 &lst_kill); 713 unregister_netdevice_many(&lst_kill); 714 break; 715 716 case NETDEV_FEAT_CHANGE: 717 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 718 ipvlan->dev->features = dev->features & IPVLAN_FEATURES; 719 ipvlan->dev->gso_max_size = dev->gso_max_size; 720 ipvlan->dev->gso_max_segs = dev->gso_max_segs; 721 netdev_features_change(ipvlan->dev); 722 } 723 break; 724 725 case NETDEV_CHANGEMTU: 726 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 727 ipvlan_adjust_mtu(ipvlan, dev); 728 break; 729 730 case NETDEV_PRE_TYPE_CHANGE: 731 /* Forbid underlying device to change its type. */ 732 return NOTIFY_BAD; 733 } 734 return NOTIFY_DONE; 735 } 736 737 static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6) 738 { 739 struct ipvl_addr *addr; 740 741 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC); 742 if (!addr) 743 return -ENOMEM; 744 745 addr->master = ipvlan; 746 if (is_v6) { 747 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr)); 748 addr->atype = IPVL_IPV6; 749 } else { 750 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr)); 751 addr->atype = IPVL_IPV4; 752 } 753 list_add_tail(&addr->anode, &ipvlan->addrs); 754 755 /* If the interface is not up, the address will be added to the hash 756 * list by ipvlan_open. 757 */ 758 if (netif_running(ipvlan->dev)) 759 ipvlan_ht_addr_add(ipvlan, addr); 760 761 return 0; 762 } 763 764 static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6) 765 { 766 struct ipvl_addr *addr; 767 768 addr = ipvlan_find_addr(ipvlan, iaddr, is_v6); 769 if (!addr) 770 return; 771 772 ipvlan_ht_addr_del(addr); 773 list_del(&addr->anode); 774 kfree_rcu(addr, rcu); 775 776 return; 777 } 778 779 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 780 { 781 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true)) { 782 netif_err(ipvlan, ifup, ipvlan->dev, 783 "Failed to add IPv6=%pI6c addr for %s intf\n", 784 ip6_addr, ipvlan->dev->name); 785 return -EINVAL; 786 } 787 788 return ipvlan_add_addr(ipvlan, ip6_addr, true); 789 } 790 791 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 792 { 793 return ipvlan_del_addr(ipvlan, ip6_addr, true); 794 } 795 796 static int ipvlan_addr6_event(struct notifier_block *unused, 797 unsigned long event, void *ptr) 798 { 799 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr; 800 struct net_device *dev = (struct net_device *)if6->idev->dev; 801 struct ipvl_dev *ipvlan = netdev_priv(dev); 802 803 /* FIXME IPv6 autoconf calls us from bh without RTNL */ 804 if (in_softirq()) 805 return NOTIFY_DONE; 806 807 if (!netif_is_ipvlan(dev)) 808 return NOTIFY_DONE; 809 810 if (!ipvlan || !ipvlan->port) 811 return NOTIFY_DONE; 812 813 switch (event) { 814 case NETDEV_UP: 815 if (ipvlan_add_addr6(ipvlan, &if6->addr)) 816 return NOTIFY_BAD; 817 break; 818 819 case NETDEV_DOWN: 820 ipvlan_del_addr6(ipvlan, &if6->addr); 821 break; 822 } 823 824 return NOTIFY_OK; 825 } 826 827 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 828 { 829 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false)) { 830 netif_err(ipvlan, ifup, ipvlan->dev, 831 "Failed to add IPv4=%pI4 on %s intf.\n", 832 ip4_addr, ipvlan->dev->name); 833 return -EINVAL; 834 } 835 836 return ipvlan_add_addr(ipvlan, ip4_addr, false); 837 } 838 839 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 840 { 841 return ipvlan_del_addr(ipvlan, ip4_addr, false); 842 } 843 844 static int ipvlan_addr4_event(struct notifier_block *unused, 845 unsigned long event, void *ptr) 846 { 847 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr; 848 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev; 849 struct ipvl_dev *ipvlan = netdev_priv(dev); 850 struct in_addr ip4_addr; 851 852 if (!netif_is_ipvlan(dev)) 853 return NOTIFY_DONE; 854 855 if (!ipvlan || !ipvlan->port) 856 return NOTIFY_DONE; 857 858 switch (event) { 859 case NETDEV_UP: 860 ip4_addr.s_addr = if4->ifa_address; 861 if (ipvlan_add_addr4(ipvlan, &ip4_addr)) 862 return NOTIFY_BAD; 863 break; 864 865 case NETDEV_DOWN: 866 ip4_addr.s_addr = if4->ifa_address; 867 ipvlan_del_addr4(ipvlan, &ip4_addr); 868 break; 869 } 870 871 return NOTIFY_OK; 872 } 873 874 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = { 875 .notifier_call = ipvlan_addr4_event, 876 }; 877 878 static struct notifier_block ipvlan_notifier_block __read_mostly = { 879 .notifier_call = ipvlan_device_event, 880 }; 881 882 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = { 883 .notifier_call = ipvlan_addr6_event, 884 }; 885 886 static void ipvlan_ns_exit(struct net *net) 887 { 888 struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid); 889 890 if (WARN_ON_ONCE(vnet->ipvl_nf_hook_refcnt)) { 891 vnet->ipvl_nf_hook_refcnt = 0; 892 nf_unregister_net_hooks(net, ipvl_nfops, 893 ARRAY_SIZE(ipvl_nfops)); 894 } 895 } 896 897 static struct pernet_operations ipvlan_net_ops = { 898 .id = &ipvlan_netid, 899 .size = sizeof(struct ipvlan_netns), 900 .exit = ipvlan_ns_exit, 901 }; 902 903 static int __init ipvlan_init_module(void) 904 { 905 int err; 906 907 ipvlan_init_secret(); 908 register_netdevice_notifier(&ipvlan_notifier_block); 909 register_inet6addr_notifier(&ipvlan_addr6_notifier_block); 910 register_inetaddr_notifier(&ipvlan_addr4_notifier_block); 911 912 err = register_pernet_subsys(&ipvlan_net_ops); 913 if (err < 0) 914 goto error; 915 916 err = ipvlan_link_register(&ipvlan_link_ops); 917 if (err < 0) { 918 unregister_pernet_subsys(&ipvlan_net_ops); 919 goto error; 920 } 921 922 return 0; 923 error: 924 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block); 925 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block); 926 unregister_netdevice_notifier(&ipvlan_notifier_block); 927 return err; 928 } 929 930 static void __exit ipvlan_cleanup_module(void) 931 { 932 rtnl_link_unregister(&ipvlan_link_ops); 933 unregister_pernet_subsys(&ipvlan_net_ops); 934 unregister_netdevice_notifier(&ipvlan_notifier_block); 935 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block); 936 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block); 937 } 938 939 module_init(ipvlan_init_module); 940 module_exit(ipvlan_cleanup_module); 941 942 MODULE_LICENSE("GPL"); 943 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>"); 944 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs"); 945 MODULE_ALIAS_RTNL_LINK("ipvlan"); 946