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 const struct nf_hook_ops ipvl_nfops[] = { 19 { 20 .hook = ipvlan_nf_input, 21 .pf = NFPROTO_IPV4, 22 .hooknum = NF_INET_LOCAL_IN, 23 .priority = INT_MAX, 24 }, 25 #if IS_ENABLED(CONFIG_IPV6) 26 { 27 .hook = ipvlan_nf_input, 28 .pf = NFPROTO_IPV6, 29 .hooknum = NF_INET_LOCAL_IN, 30 .priority = INT_MAX, 31 }, 32 #endif 33 }; 34 35 static const struct l3mdev_ops ipvl_l3mdev_ops = { 36 .l3mdev_l3_rcv = ipvlan_l3_rcv, 37 }; 38 39 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev) 40 { 41 ipvlan->dev->mtu = dev->mtu; 42 } 43 44 static int ipvlan_register_nf_hook(struct net *net) 45 { 46 struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid); 47 int err = 0; 48 49 if (!vnet->ipvl_nf_hook_refcnt) { 50 err = nf_register_net_hooks(net, ipvl_nfops, 51 ARRAY_SIZE(ipvl_nfops)); 52 if (!err) 53 vnet->ipvl_nf_hook_refcnt = 1; 54 } else { 55 vnet->ipvl_nf_hook_refcnt++; 56 } 57 58 return err; 59 } 60 61 static void ipvlan_unregister_nf_hook(struct net *net) 62 { 63 struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid); 64 65 if (WARN_ON(!vnet->ipvl_nf_hook_refcnt)) 66 return; 67 68 vnet->ipvl_nf_hook_refcnt--; 69 if (!vnet->ipvl_nf_hook_refcnt) 70 nf_unregister_net_hooks(net, ipvl_nfops, 71 ARRAY_SIZE(ipvl_nfops)); 72 } 73 74 static int ipvlan_set_port_mode(struct ipvl_port *port, u16 nval, 75 struct netlink_ext_ack *extack) 76 { 77 struct ipvl_dev *ipvlan; 78 struct net_device *mdev = port->dev; 79 unsigned int flags; 80 int err; 81 82 ASSERT_RTNL(); 83 if (port->mode != nval) { 84 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 85 flags = ipvlan->dev->flags; 86 if (nval == IPVLAN_MODE_L3 || nval == IPVLAN_MODE_L3S) { 87 err = dev_change_flags(ipvlan->dev, 88 flags | IFF_NOARP, 89 extack); 90 } else { 91 err = dev_change_flags(ipvlan->dev, 92 flags & ~IFF_NOARP, 93 extack); 94 } 95 if (unlikely(err)) 96 goto fail; 97 } 98 if (nval == IPVLAN_MODE_L3S) { 99 /* New mode is L3S */ 100 err = ipvlan_register_nf_hook(read_pnet(&port->pnet)); 101 if (!err) { 102 mdev->l3mdev_ops = &ipvl_l3mdev_ops; 103 mdev->priv_flags |= IFF_L3MDEV_MASTER; 104 } else 105 goto fail; 106 } else if (port->mode == IPVLAN_MODE_L3S) { 107 /* Old mode was L3S */ 108 mdev->priv_flags &= ~IFF_L3MDEV_MASTER; 109 ipvlan_unregister_nf_hook(read_pnet(&port->pnet)); 110 mdev->l3mdev_ops = NULL; 111 } 112 port->mode = nval; 113 } 114 return 0; 115 116 fail: 117 /* Undo the flags changes that have been done so far. */ 118 list_for_each_entry_continue_reverse(ipvlan, &port->ipvlans, pnode) { 119 flags = ipvlan->dev->flags; 120 if (port->mode == IPVLAN_MODE_L3 || 121 port->mode == IPVLAN_MODE_L3S) 122 dev_change_flags(ipvlan->dev, flags | IFF_NOARP, 123 NULL); 124 else 125 dev_change_flags(ipvlan->dev, flags & ~IFF_NOARP, 126 NULL); 127 } 128 129 return err; 130 } 131 132 static int ipvlan_port_create(struct net_device *dev) 133 { 134 struct ipvl_port *port; 135 int err, idx; 136 137 port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL); 138 if (!port) 139 return -ENOMEM; 140 141 write_pnet(&port->pnet, dev_net(dev)); 142 port->dev = dev; 143 port->mode = IPVLAN_MODE_L3; 144 INIT_LIST_HEAD(&port->ipvlans); 145 for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++) 146 INIT_HLIST_HEAD(&port->hlhead[idx]); 147 148 skb_queue_head_init(&port->backlog); 149 INIT_WORK(&port->wq, ipvlan_process_multicast); 150 ida_init(&port->ida); 151 port->dev_id_start = 1; 152 153 err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port); 154 if (err) 155 goto err; 156 157 return 0; 158 159 err: 160 kfree(port); 161 return err; 162 } 163 164 static void ipvlan_port_destroy(struct net_device *dev) 165 { 166 struct ipvl_port *port = ipvlan_port_get_rtnl(dev); 167 struct sk_buff *skb; 168 169 if (port->mode == IPVLAN_MODE_L3S) { 170 dev->priv_flags &= ~IFF_L3MDEV_MASTER; 171 ipvlan_unregister_nf_hook(dev_net(dev)); 172 dev->l3mdev_ops = NULL; 173 } 174 netdev_rx_handler_unregister(dev); 175 cancel_work_sync(&port->wq); 176 while ((skb = __skb_dequeue(&port->backlog)) != NULL) { 177 if (skb->dev) 178 dev_put(skb->dev); 179 kfree_skb(skb); 180 } 181 ida_destroy(&port->ida); 182 kfree(port); 183 } 184 185 #define IPVLAN_FEATURES \ 186 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 187 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_GSO_ROBUST | \ 188 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 189 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 190 191 #define IPVLAN_STATE_MASK \ 192 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 193 194 static int ipvlan_init(struct net_device *dev) 195 { 196 struct ipvl_dev *ipvlan = netdev_priv(dev); 197 struct net_device *phy_dev = ipvlan->phy_dev; 198 struct ipvl_port *port; 199 int err; 200 201 dev->state = (dev->state & ~IPVLAN_STATE_MASK) | 202 (phy_dev->state & IPVLAN_STATE_MASK); 203 dev->features = phy_dev->features & IPVLAN_FEATURES; 204 dev->features |= NETIF_F_LLTX | NETIF_F_VLAN_CHALLENGED; 205 dev->gso_max_size = phy_dev->gso_max_size; 206 dev->gso_max_segs = phy_dev->gso_max_segs; 207 dev->hard_header_len = phy_dev->hard_header_len; 208 209 netdev_lockdep_set_classes(dev); 210 211 ipvlan->pcpu_stats = netdev_alloc_pcpu_stats(struct ipvl_pcpu_stats); 212 if (!ipvlan->pcpu_stats) 213 return -ENOMEM; 214 215 if (!netif_is_ipvlan_port(phy_dev)) { 216 err = ipvlan_port_create(phy_dev); 217 if (err < 0) { 218 free_percpu(ipvlan->pcpu_stats); 219 return err; 220 } 221 } 222 port = ipvlan_port_get_rtnl(phy_dev); 223 port->count += 1; 224 return 0; 225 } 226 227 static void ipvlan_uninit(struct net_device *dev) 228 { 229 struct ipvl_dev *ipvlan = netdev_priv(dev); 230 struct net_device *phy_dev = ipvlan->phy_dev; 231 struct ipvl_port *port; 232 233 free_percpu(ipvlan->pcpu_stats); 234 235 port = ipvlan_port_get_rtnl(phy_dev); 236 port->count -= 1; 237 if (!port->count) 238 ipvlan_port_destroy(port->dev); 239 } 240 241 static int ipvlan_open(struct net_device *dev) 242 { 243 struct ipvl_dev *ipvlan = netdev_priv(dev); 244 struct net_device *phy_dev = ipvlan->phy_dev; 245 struct ipvl_addr *addr; 246 247 if (ipvlan->port->mode == IPVLAN_MODE_L3 || 248 ipvlan->port->mode == IPVLAN_MODE_L3S) 249 dev->flags |= IFF_NOARP; 250 else 251 dev->flags &= ~IFF_NOARP; 252 253 rcu_read_lock(); 254 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode) 255 ipvlan_ht_addr_add(ipvlan, addr); 256 rcu_read_unlock(); 257 258 return dev_uc_add(phy_dev, phy_dev->dev_addr); 259 } 260 261 static int ipvlan_stop(struct net_device *dev) 262 { 263 struct ipvl_dev *ipvlan = netdev_priv(dev); 264 struct net_device *phy_dev = ipvlan->phy_dev; 265 struct ipvl_addr *addr; 266 267 dev_uc_unsync(phy_dev, dev); 268 dev_mc_unsync(phy_dev, dev); 269 270 dev_uc_del(phy_dev, phy_dev->dev_addr); 271 272 rcu_read_lock(); 273 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode) 274 ipvlan_ht_addr_del(addr); 275 rcu_read_unlock(); 276 277 return 0; 278 } 279 280 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb, 281 struct net_device *dev) 282 { 283 const struct ipvl_dev *ipvlan = netdev_priv(dev); 284 int skblen = skb->len; 285 int ret; 286 287 ret = ipvlan_queue_xmit(skb, dev); 288 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 289 struct ipvl_pcpu_stats *pcptr; 290 291 pcptr = this_cpu_ptr(ipvlan->pcpu_stats); 292 293 u64_stats_update_begin(&pcptr->syncp); 294 pcptr->tx_pkts++; 295 pcptr->tx_bytes += skblen; 296 u64_stats_update_end(&pcptr->syncp); 297 } else { 298 this_cpu_inc(ipvlan->pcpu_stats->tx_drps); 299 } 300 return ret; 301 } 302 303 static netdev_features_t ipvlan_fix_features(struct net_device *dev, 304 netdev_features_t features) 305 { 306 struct ipvl_dev *ipvlan = netdev_priv(dev); 307 308 return features & (ipvlan->sfeatures | ~IPVLAN_FEATURES); 309 } 310 311 static void ipvlan_change_rx_flags(struct net_device *dev, int change) 312 { 313 struct ipvl_dev *ipvlan = netdev_priv(dev); 314 struct net_device *phy_dev = ipvlan->phy_dev; 315 316 if (change & IFF_ALLMULTI) 317 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1); 318 } 319 320 static void ipvlan_set_multicast_mac_filter(struct net_device *dev) 321 { 322 struct ipvl_dev *ipvlan = netdev_priv(dev); 323 324 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 325 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE); 326 } else { 327 struct netdev_hw_addr *ha; 328 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE); 329 330 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE); 331 netdev_for_each_mc_addr(ha, dev) 332 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters); 333 334 /* Turn-on broadcast bit irrespective of address family, 335 * since broadcast is deferred to a work-queue, hence no 336 * impact on fast-path processing. 337 */ 338 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters); 339 340 bitmap_copy(ipvlan->mac_filters, mc_filters, 341 IPVLAN_MAC_FILTER_SIZE); 342 } 343 dev_uc_sync(ipvlan->phy_dev, dev); 344 dev_mc_sync(ipvlan->phy_dev, dev); 345 } 346 347 static void ipvlan_get_stats64(struct net_device *dev, 348 struct rtnl_link_stats64 *s) 349 { 350 struct ipvl_dev *ipvlan = netdev_priv(dev); 351 352 if (ipvlan->pcpu_stats) { 353 struct ipvl_pcpu_stats *pcptr; 354 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes; 355 u32 rx_errs = 0, tx_drps = 0; 356 u32 strt; 357 int idx; 358 359 for_each_possible_cpu(idx) { 360 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx); 361 do { 362 strt= u64_stats_fetch_begin_irq(&pcptr->syncp); 363 rx_pkts = pcptr->rx_pkts; 364 rx_bytes = pcptr->rx_bytes; 365 rx_mcast = pcptr->rx_mcast; 366 tx_pkts = pcptr->tx_pkts; 367 tx_bytes = pcptr->tx_bytes; 368 } while (u64_stats_fetch_retry_irq(&pcptr->syncp, 369 strt)); 370 371 s->rx_packets += rx_pkts; 372 s->rx_bytes += rx_bytes; 373 s->multicast += rx_mcast; 374 s->tx_packets += tx_pkts; 375 s->tx_bytes += tx_bytes; 376 377 /* u32 values are updated without syncp protection. */ 378 rx_errs += pcptr->rx_errs; 379 tx_drps += pcptr->tx_drps; 380 } 381 s->rx_errors = rx_errs; 382 s->rx_dropped = rx_errs; 383 s->tx_dropped = tx_drps; 384 } 385 } 386 387 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid) 388 { 389 struct ipvl_dev *ipvlan = netdev_priv(dev); 390 struct net_device *phy_dev = ipvlan->phy_dev; 391 392 return vlan_vid_add(phy_dev, proto, vid); 393 } 394 395 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto, 396 u16 vid) 397 { 398 struct ipvl_dev *ipvlan = netdev_priv(dev); 399 struct net_device *phy_dev = ipvlan->phy_dev; 400 401 vlan_vid_del(phy_dev, proto, vid); 402 return 0; 403 } 404 405 static int ipvlan_get_iflink(const struct net_device *dev) 406 { 407 struct ipvl_dev *ipvlan = netdev_priv(dev); 408 409 return ipvlan->phy_dev->ifindex; 410 } 411 412 static const struct net_device_ops ipvlan_netdev_ops = { 413 .ndo_init = ipvlan_init, 414 .ndo_uninit = ipvlan_uninit, 415 .ndo_open = ipvlan_open, 416 .ndo_stop = ipvlan_stop, 417 .ndo_start_xmit = ipvlan_start_xmit, 418 .ndo_fix_features = ipvlan_fix_features, 419 .ndo_change_rx_flags = ipvlan_change_rx_flags, 420 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter, 421 .ndo_get_stats64 = ipvlan_get_stats64, 422 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid, 423 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid, 424 .ndo_get_iflink = ipvlan_get_iflink, 425 }; 426 427 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 428 unsigned short type, const void *daddr, 429 const void *saddr, unsigned len) 430 { 431 const struct ipvl_dev *ipvlan = netdev_priv(dev); 432 struct net_device *phy_dev = ipvlan->phy_dev; 433 434 /* TODO Probably use a different field than dev_addr so that the 435 * mac-address on the virtual device is portable and can be carried 436 * while the packets use the mac-addr on the physical device. 437 */ 438 return dev_hard_header(skb, phy_dev, type, daddr, 439 saddr ? : phy_dev->dev_addr, len); 440 } 441 442 static const struct header_ops ipvlan_header_ops = { 443 .create = ipvlan_hard_header, 444 .parse = eth_header_parse, 445 .cache = eth_header_cache, 446 .cache_update = eth_header_cache_update, 447 }; 448 449 static bool netif_is_ipvlan(const struct net_device *dev) 450 { 451 /* both ipvlan and ipvtap devices use the same netdev_ops */ 452 return dev->netdev_ops == &ipvlan_netdev_ops; 453 } 454 455 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev, 456 struct ethtool_link_ksettings *cmd) 457 { 458 const struct ipvl_dev *ipvlan = netdev_priv(dev); 459 460 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd); 461 } 462 463 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev, 464 struct ethtool_drvinfo *drvinfo) 465 { 466 strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver)); 467 strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version)); 468 } 469 470 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev) 471 { 472 const struct ipvl_dev *ipvlan = netdev_priv(dev); 473 474 return ipvlan->msg_enable; 475 } 476 477 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value) 478 { 479 struct ipvl_dev *ipvlan = netdev_priv(dev); 480 481 ipvlan->msg_enable = value; 482 } 483 484 static const struct ethtool_ops ipvlan_ethtool_ops = { 485 .get_link = ethtool_op_get_link, 486 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings, 487 .get_drvinfo = ipvlan_ethtool_get_drvinfo, 488 .get_msglevel = ipvlan_ethtool_get_msglevel, 489 .set_msglevel = ipvlan_ethtool_set_msglevel, 490 }; 491 492 static int ipvlan_nl_changelink(struct net_device *dev, 493 struct nlattr *tb[], struct nlattr *data[], 494 struct netlink_ext_ack *extack) 495 { 496 struct ipvl_dev *ipvlan = netdev_priv(dev); 497 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 498 int err = 0; 499 500 if (!data) 501 return 0; 502 503 if (data[IFLA_IPVLAN_MODE]) { 504 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 505 506 err = ipvlan_set_port_mode(port, nmode, extack); 507 } 508 509 if (!err && data[IFLA_IPVLAN_FLAGS]) { 510 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]); 511 512 if (flags & IPVLAN_F_PRIVATE) 513 ipvlan_mark_private(port); 514 else 515 ipvlan_clear_private(port); 516 517 if (flags & IPVLAN_F_VEPA) 518 ipvlan_mark_vepa(port); 519 else 520 ipvlan_clear_vepa(port); 521 } 522 523 return err; 524 } 525 526 static size_t ipvlan_nl_getsize(const struct net_device *dev) 527 { 528 return (0 529 + nla_total_size(2) /* IFLA_IPVLAN_MODE */ 530 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */ 531 ); 532 } 533 534 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[], 535 struct netlink_ext_ack *extack) 536 { 537 if (!data) 538 return 0; 539 540 if (data[IFLA_IPVLAN_MODE]) { 541 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 542 543 if (mode >= IPVLAN_MODE_MAX) 544 return -EINVAL; 545 } 546 if (data[IFLA_IPVLAN_FLAGS]) { 547 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]); 548 549 /* Only two bits are used at this moment. */ 550 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) 551 return -EINVAL; 552 /* Also both flags can't be active at the same time. */ 553 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) == 554 (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) 555 return -EINVAL; 556 } 557 558 return 0; 559 } 560 561 static int ipvlan_nl_fillinfo(struct sk_buff *skb, 562 const struct net_device *dev) 563 { 564 struct ipvl_dev *ipvlan = netdev_priv(dev); 565 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 566 int ret = -EINVAL; 567 568 if (!port) 569 goto err; 570 571 ret = -EMSGSIZE; 572 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode)) 573 goto err; 574 if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags)) 575 goto err; 576 577 return 0; 578 579 err: 580 return ret; 581 } 582 583 int ipvlan_link_new(struct net *src_net, struct net_device *dev, 584 struct nlattr *tb[], struct nlattr *data[], 585 struct netlink_ext_ack *extack) 586 { 587 struct ipvl_dev *ipvlan = netdev_priv(dev); 588 struct ipvl_port *port; 589 struct net_device *phy_dev; 590 int err; 591 u16 mode = IPVLAN_MODE_L3; 592 593 if (!tb[IFLA_LINK]) 594 return -EINVAL; 595 596 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 597 if (!phy_dev) 598 return -ENODEV; 599 600 if (netif_is_ipvlan(phy_dev)) { 601 struct ipvl_dev *tmp = netdev_priv(phy_dev); 602 603 phy_dev = tmp->phy_dev; 604 } else if (!netif_is_ipvlan_port(phy_dev)) { 605 /* Exit early if the underlying link is invalid or busy */ 606 if (phy_dev->type != ARPHRD_ETHER || 607 phy_dev->flags & IFF_LOOPBACK) { 608 netdev_err(phy_dev, 609 "Master is either lo or non-ether device\n"); 610 return -EINVAL; 611 } 612 613 if (netdev_is_rx_handler_busy(phy_dev)) { 614 netdev_err(phy_dev, "Device is already in use.\n"); 615 return -EBUSY; 616 } 617 } 618 619 ipvlan->phy_dev = phy_dev; 620 ipvlan->dev = dev; 621 ipvlan->sfeatures = IPVLAN_FEATURES; 622 if (!tb[IFLA_MTU]) 623 ipvlan_adjust_mtu(ipvlan, phy_dev); 624 INIT_LIST_HEAD(&ipvlan->addrs); 625 spin_lock_init(&ipvlan->addrs_lock); 626 627 /* TODO Probably put random address here to be presented to the 628 * world but keep using the physical-dev address for the outgoing 629 * packets. 630 */ 631 memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN); 632 633 dev->priv_flags |= IFF_NO_RX_HANDLER; 634 635 err = register_netdevice(dev); 636 if (err < 0) 637 return err; 638 639 /* ipvlan_init() would have created the port, if required */ 640 port = ipvlan_port_get_rtnl(phy_dev); 641 ipvlan->port = port; 642 643 /* If the port-id base is at the MAX value, then wrap it around and 644 * begin from 0x1 again. This may be due to a busy system where lots 645 * of slaves are getting created and deleted. 646 */ 647 if (port->dev_id_start == 0xFFFE) 648 port->dev_id_start = 0x1; 649 650 /* Since L2 address is shared among all IPvlan slaves including 651 * master, use unique 16 bit dev-ids to diffentiate among them. 652 * Assign IDs between 0x1 and 0xFFFE (used by the master) to each 653 * slave link [see addrconf_ifid_eui48()]. 654 */ 655 err = ida_simple_get(&port->ida, port->dev_id_start, 0xFFFE, 656 GFP_KERNEL); 657 if (err < 0) 658 err = ida_simple_get(&port->ida, 0x1, port->dev_id_start, 659 GFP_KERNEL); 660 if (err < 0) 661 goto unregister_netdev; 662 dev->dev_id = err; 663 664 /* Increment id-base to the next slot for the future assignment */ 665 port->dev_id_start = err + 1; 666 667 err = netdev_upper_dev_link(phy_dev, dev, extack); 668 if (err) 669 goto remove_ida; 670 671 /* Flags are per port and latest update overrides. User has 672 * to be consistent in setting it just like the mode attribute. 673 */ 674 if (data && data[IFLA_IPVLAN_FLAGS]) 675 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]); 676 677 if (data && data[IFLA_IPVLAN_MODE]) 678 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 679 680 err = ipvlan_set_port_mode(port, mode, extack); 681 if (err) 682 goto unlink_netdev; 683 684 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans); 685 netif_stacked_transfer_operstate(phy_dev, dev); 686 return 0; 687 688 unlink_netdev: 689 netdev_upper_dev_unlink(phy_dev, dev); 690 remove_ida: 691 ida_simple_remove(&port->ida, dev->dev_id); 692 unregister_netdev: 693 unregister_netdevice(dev); 694 return err; 695 } 696 EXPORT_SYMBOL_GPL(ipvlan_link_new); 697 698 void ipvlan_link_delete(struct net_device *dev, struct list_head *head) 699 { 700 struct ipvl_dev *ipvlan = netdev_priv(dev); 701 struct ipvl_addr *addr, *next; 702 703 spin_lock_bh(&ipvlan->addrs_lock); 704 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) { 705 ipvlan_ht_addr_del(addr); 706 list_del_rcu(&addr->anode); 707 kfree_rcu(addr, rcu); 708 } 709 spin_unlock_bh(&ipvlan->addrs_lock); 710 711 ida_simple_remove(&ipvlan->port->ida, dev->dev_id); 712 list_del_rcu(&ipvlan->pnode); 713 unregister_netdevice_queue(dev, head); 714 netdev_upper_dev_unlink(ipvlan->phy_dev, dev); 715 } 716 EXPORT_SYMBOL_GPL(ipvlan_link_delete); 717 718 void ipvlan_link_setup(struct net_device *dev) 719 { 720 ether_setup(dev); 721 722 dev->max_mtu = ETH_MAX_MTU; 723 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 724 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE; 725 dev->netdev_ops = &ipvlan_netdev_ops; 726 dev->needs_free_netdev = true; 727 dev->header_ops = &ipvlan_header_ops; 728 dev->ethtool_ops = &ipvlan_ethtool_ops; 729 } 730 EXPORT_SYMBOL_GPL(ipvlan_link_setup); 731 732 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] = 733 { 734 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 }, 735 [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 }, 736 }; 737 738 static struct rtnl_link_ops ipvlan_link_ops = { 739 .kind = "ipvlan", 740 .priv_size = sizeof(struct ipvl_dev), 741 742 .setup = ipvlan_link_setup, 743 .newlink = ipvlan_link_new, 744 .dellink = ipvlan_link_delete, 745 }; 746 747 int ipvlan_link_register(struct rtnl_link_ops *ops) 748 { 749 ops->get_size = ipvlan_nl_getsize; 750 ops->policy = ipvlan_nl_policy; 751 ops->validate = ipvlan_nl_validate; 752 ops->fill_info = ipvlan_nl_fillinfo; 753 ops->changelink = ipvlan_nl_changelink; 754 ops->maxtype = IFLA_IPVLAN_MAX; 755 return rtnl_link_register(ops); 756 } 757 EXPORT_SYMBOL_GPL(ipvlan_link_register); 758 759 static int ipvlan_device_event(struct notifier_block *unused, 760 unsigned long event, void *ptr) 761 { 762 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 763 struct ipvl_dev *ipvlan, *next; 764 struct ipvl_port *port; 765 LIST_HEAD(lst_kill); 766 767 if (!netif_is_ipvlan_port(dev)) 768 return NOTIFY_DONE; 769 770 port = ipvlan_port_get_rtnl(dev); 771 772 switch (event) { 773 case NETDEV_CHANGE: 774 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 775 netif_stacked_transfer_operstate(ipvlan->phy_dev, 776 ipvlan->dev); 777 break; 778 779 case NETDEV_REGISTER: { 780 struct net *oldnet, *newnet = dev_net(dev); 781 struct ipvlan_netns *old_vnet; 782 783 oldnet = read_pnet(&port->pnet); 784 if (net_eq(newnet, oldnet)) 785 break; 786 787 write_pnet(&port->pnet, newnet); 788 789 old_vnet = net_generic(oldnet, ipvlan_netid); 790 if (!old_vnet->ipvl_nf_hook_refcnt) 791 break; 792 793 ipvlan_register_nf_hook(newnet); 794 ipvlan_unregister_nf_hook(oldnet); 795 break; 796 } 797 case NETDEV_UNREGISTER: 798 if (dev->reg_state != NETREG_UNREGISTERING) 799 break; 800 801 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode) 802 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev, 803 &lst_kill); 804 unregister_netdevice_many(&lst_kill); 805 break; 806 807 case NETDEV_FEAT_CHANGE: 808 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 809 ipvlan->dev->features = dev->features & IPVLAN_FEATURES; 810 ipvlan->dev->gso_max_size = dev->gso_max_size; 811 ipvlan->dev->gso_max_segs = dev->gso_max_segs; 812 netdev_features_change(ipvlan->dev); 813 } 814 break; 815 816 case NETDEV_CHANGEMTU: 817 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 818 ipvlan_adjust_mtu(ipvlan, dev); 819 break; 820 821 case NETDEV_CHANGEADDR: 822 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 823 ether_addr_copy(ipvlan->dev->dev_addr, dev->dev_addr); 824 call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev); 825 } 826 break; 827 828 case NETDEV_PRE_TYPE_CHANGE: 829 /* Forbid underlying device to change its type. */ 830 return NOTIFY_BAD; 831 } 832 return NOTIFY_DONE; 833 } 834 835 /* the caller must held the addrs lock */ 836 static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6) 837 { 838 struct ipvl_addr *addr; 839 840 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC); 841 if (!addr) 842 return -ENOMEM; 843 844 addr->master = ipvlan; 845 if (!is_v6) { 846 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr)); 847 addr->atype = IPVL_IPV4; 848 #if IS_ENABLED(CONFIG_IPV6) 849 } else { 850 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr)); 851 addr->atype = IPVL_IPV6; 852 #endif 853 } 854 855 list_add_tail_rcu(&addr->anode, &ipvlan->addrs); 856 857 /* If the interface is not up, the address will be added to the hash 858 * list by ipvlan_open. 859 */ 860 if (netif_running(ipvlan->dev)) 861 ipvlan_ht_addr_add(ipvlan, addr); 862 863 return 0; 864 } 865 866 static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6) 867 { 868 struct ipvl_addr *addr; 869 870 spin_lock_bh(&ipvlan->addrs_lock); 871 addr = ipvlan_find_addr(ipvlan, iaddr, is_v6); 872 if (!addr) { 873 spin_unlock_bh(&ipvlan->addrs_lock); 874 return; 875 } 876 877 ipvlan_ht_addr_del(addr); 878 list_del_rcu(&addr->anode); 879 spin_unlock_bh(&ipvlan->addrs_lock); 880 kfree_rcu(addr, rcu); 881 } 882 883 static bool ipvlan_is_valid_dev(const struct net_device *dev) 884 { 885 struct ipvl_dev *ipvlan = netdev_priv(dev); 886 887 if (!netif_is_ipvlan(dev)) 888 return false; 889 890 if (!ipvlan || !ipvlan->port) 891 return false; 892 893 return true; 894 } 895 896 #if IS_ENABLED(CONFIG_IPV6) 897 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 898 { 899 int ret = -EINVAL; 900 901 spin_lock_bh(&ipvlan->addrs_lock); 902 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true)) 903 netif_err(ipvlan, ifup, ipvlan->dev, 904 "Failed to add IPv6=%pI6c addr for %s intf\n", 905 ip6_addr, ipvlan->dev->name); 906 else 907 ret = ipvlan_add_addr(ipvlan, ip6_addr, true); 908 spin_unlock_bh(&ipvlan->addrs_lock); 909 return ret; 910 } 911 912 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 913 { 914 return ipvlan_del_addr(ipvlan, ip6_addr, true); 915 } 916 917 static int ipvlan_addr6_event(struct notifier_block *unused, 918 unsigned long event, void *ptr) 919 { 920 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr; 921 struct net_device *dev = (struct net_device *)if6->idev->dev; 922 struct ipvl_dev *ipvlan = netdev_priv(dev); 923 924 if (!ipvlan_is_valid_dev(dev)) 925 return NOTIFY_DONE; 926 927 switch (event) { 928 case NETDEV_UP: 929 if (ipvlan_add_addr6(ipvlan, &if6->addr)) 930 return NOTIFY_BAD; 931 break; 932 933 case NETDEV_DOWN: 934 ipvlan_del_addr6(ipvlan, &if6->addr); 935 break; 936 } 937 938 return NOTIFY_OK; 939 } 940 941 static int ipvlan_addr6_validator_event(struct notifier_block *unused, 942 unsigned long event, void *ptr) 943 { 944 struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr; 945 struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev; 946 struct ipvl_dev *ipvlan = netdev_priv(dev); 947 948 if (!ipvlan_is_valid_dev(dev)) 949 return NOTIFY_DONE; 950 951 switch (event) { 952 case NETDEV_UP: 953 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) { 954 NL_SET_ERR_MSG(i6vi->extack, 955 "Address already assigned to an ipvlan device"); 956 return notifier_from_errno(-EADDRINUSE); 957 } 958 break; 959 } 960 961 return NOTIFY_OK; 962 } 963 #endif 964 965 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 966 { 967 int ret = -EINVAL; 968 969 spin_lock_bh(&ipvlan->addrs_lock); 970 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false)) 971 netif_err(ipvlan, ifup, ipvlan->dev, 972 "Failed to add IPv4=%pI4 on %s intf.\n", 973 ip4_addr, ipvlan->dev->name); 974 else 975 ret = ipvlan_add_addr(ipvlan, ip4_addr, false); 976 spin_unlock_bh(&ipvlan->addrs_lock); 977 return ret; 978 } 979 980 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 981 { 982 return ipvlan_del_addr(ipvlan, ip4_addr, false); 983 } 984 985 static int ipvlan_addr4_event(struct notifier_block *unused, 986 unsigned long event, void *ptr) 987 { 988 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr; 989 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev; 990 struct ipvl_dev *ipvlan = netdev_priv(dev); 991 struct in_addr ip4_addr; 992 993 if (!ipvlan_is_valid_dev(dev)) 994 return NOTIFY_DONE; 995 996 switch (event) { 997 case NETDEV_UP: 998 ip4_addr.s_addr = if4->ifa_address; 999 if (ipvlan_add_addr4(ipvlan, &ip4_addr)) 1000 return NOTIFY_BAD; 1001 break; 1002 1003 case NETDEV_DOWN: 1004 ip4_addr.s_addr = if4->ifa_address; 1005 ipvlan_del_addr4(ipvlan, &ip4_addr); 1006 break; 1007 } 1008 1009 return NOTIFY_OK; 1010 } 1011 1012 static int ipvlan_addr4_validator_event(struct notifier_block *unused, 1013 unsigned long event, void *ptr) 1014 { 1015 struct in_validator_info *ivi = (struct in_validator_info *)ptr; 1016 struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev; 1017 struct ipvl_dev *ipvlan = netdev_priv(dev); 1018 1019 if (!ipvlan_is_valid_dev(dev)) 1020 return NOTIFY_DONE; 1021 1022 switch (event) { 1023 case NETDEV_UP: 1024 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) { 1025 NL_SET_ERR_MSG(ivi->extack, 1026 "Address already assigned to an ipvlan device"); 1027 return notifier_from_errno(-EADDRINUSE); 1028 } 1029 break; 1030 } 1031 1032 return NOTIFY_OK; 1033 } 1034 1035 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = { 1036 .notifier_call = ipvlan_addr4_event, 1037 }; 1038 1039 static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = { 1040 .notifier_call = ipvlan_addr4_validator_event, 1041 }; 1042 1043 static struct notifier_block ipvlan_notifier_block __read_mostly = { 1044 .notifier_call = ipvlan_device_event, 1045 }; 1046 1047 #if IS_ENABLED(CONFIG_IPV6) 1048 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = { 1049 .notifier_call = ipvlan_addr6_event, 1050 }; 1051 1052 static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = { 1053 .notifier_call = ipvlan_addr6_validator_event, 1054 }; 1055 #endif 1056 1057 static void ipvlan_ns_exit(struct net *net) 1058 { 1059 struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid); 1060 1061 if (WARN_ON_ONCE(vnet->ipvl_nf_hook_refcnt)) { 1062 vnet->ipvl_nf_hook_refcnt = 0; 1063 nf_unregister_net_hooks(net, ipvl_nfops, 1064 ARRAY_SIZE(ipvl_nfops)); 1065 } 1066 } 1067 1068 static struct pernet_operations ipvlan_net_ops = { 1069 .id = &ipvlan_netid, 1070 .size = sizeof(struct ipvlan_netns), 1071 .exit = ipvlan_ns_exit, 1072 }; 1073 1074 static int __init ipvlan_init_module(void) 1075 { 1076 int err; 1077 1078 ipvlan_init_secret(); 1079 register_netdevice_notifier(&ipvlan_notifier_block); 1080 #if IS_ENABLED(CONFIG_IPV6) 1081 register_inet6addr_notifier(&ipvlan_addr6_notifier_block); 1082 register_inet6addr_validator_notifier( 1083 &ipvlan_addr6_vtor_notifier_block); 1084 #endif 1085 register_inetaddr_notifier(&ipvlan_addr4_notifier_block); 1086 register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block); 1087 1088 err = register_pernet_subsys(&ipvlan_net_ops); 1089 if (err < 0) 1090 goto error; 1091 1092 err = ipvlan_link_register(&ipvlan_link_ops); 1093 if (err < 0) { 1094 unregister_pernet_subsys(&ipvlan_net_ops); 1095 goto error; 1096 } 1097 1098 return 0; 1099 error: 1100 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block); 1101 unregister_inetaddr_validator_notifier( 1102 &ipvlan_addr4_vtor_notifier_block); 1103 #if IS_ENABLED(CONFIG_IPV6) 1104 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block); 1105 unregister_inet6addr_validator_notifier( 1106 &ipvlan_addr6_vtor_notifier_block); 1107 #endif 1108 unregister_netdevice_notifier(&ipvlan_notifier_block); 1109 return err; 1110 } 1111 1112 static void __exit ipvlan_cleanup_module(void) 1113 { 1114 rtnl_link_unregister(&ipvlan_link_ops); 1115 unregister_pernet_subsys(&ipvlan_net_ops); 1116 unregister_netdevice_notifier(&ipvlan_notifier_block); 1117 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block); 1118 unregister_inetaddr_validator_notifier( 1119 &ipvlan_addr4_vtor_notifier_block); 1120 #if IS_ENABLED(CONFIG_IPV6) 1121 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block); 1122 unregister_inet6addr_validator_notifier( 1123 &ipvlan_addr6_vtor_notifier_block); 1124 #endif 1125 } 1126 1127 module_init(ipvlan_init_module); 1128 module_exit(ipvlan_cleanup_module); 1129 1130 MODULE_LICENSE("GPL"); 1131 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>"); 1132 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs"); 1133 MODULE_ALIAS_RTNL_LINK("ipvlan"); 1134