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 int ipvlan_set_port_mode(struct ipvl_port *port, u16 nval, 13 struct netlink_ext_ack *extack) 14 { 15 struct ipvl_dev *ipvlan; 16 unsigned int flags; 17 int err; 18 19 ASSERT_RTNL(); 20 if (port->mode != nval) { 21 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 22 flags = ipvlan->dev->flags; 23 if (nval == IPVLAN_MODE_L3 || nval == IPVLAN_MODE_L3S) { 24 err = dev_change_flags(ipvlan->dev, 25 flags | IFF_NOARP, 26 extack); 27 } else { 28 err = dev_change_flags(ipvlan->dev, 29 flags & ~IFF_NOARP, 30 extack); 31 } 32 if (unlikely(err)) 33 goto fail; 34 } 35 if (nval == IPVLAN_MODE_L3S) { 36 /* New mode is L3S */ 37 err = ipvlan_l3s_register(port); 38 if (err) 39 goto fail; 40 } else if (port->mode == IPVLAN_MODE_L3S) { 41 /* Old mode was L3S */ 42 ipvlan_l3s_unregister(port); 43 } 44 port->mode = nval; 45 } 46 return 0; 47 48 fail: 49 /* Undo the flags changes that have been done so far. */ 50 list_for_each_entry_continue_reverse(ipvlan, &port->ipvlans, pnode) { 51 flags = ipvlan->dev->flags; 52 if (port->mode == IPVLAN_MODE_L3 || 53 port->mode == IPVLAN_MODE_L3S) 54 dev_change_flags(ipvlan->dev, flags | IFF_NOARP, 55 NULL); 56 else 57 dev_change_flags(ipvlan->dev, flags & ~IFF_NOARP, 58 NULL); 59 } 60 61 return err; 62 } 63 64 static int ipvlan_port_create(struct net_device *dev) 65 { 66 struct ipvl_port *port; 67 int err, idx; 68 69 port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL); 70 if (!port) 71 return -ENOMEM; 72 73 write_pnet(&port->pnet, dev_net(dev)); 74 port->dev = dev; 75 port->mode = IPVLAN_MODE_L3; 76 INIT_LIST_HEAD(&port->ipvlans); 77 for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++) 78 INIT_HLIST_HEAD(&port->hlhead[idx]); 79 80 skb_queue_head_init(&port->backlog); 81 INIT_WORK(&port->wq, ipvlan_process_multicast); 82 ida_init(&port->ida); 83 port->dev_id_start = 1; 84 85 err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port); 86 if (err) 87 goto err; 88 89 return 0; 90 91 err: 92 kfree(port); 93 return err; 94 } 95 96 static void ipvlan_port_destroy(struct net_device *dev) 97 { 98 struct ipvl_port *port = ipvlan_port_get_rtnl(dev); 99 struct sk_buff *skb; 100 101 if (port->mode == IPVLAN_MODE_L3S) 102 ipvlan_l3s_unregister(port); 103 netdev_rx_handler_unregister(dev); 104 cancel_work_sync(&port->wq); 105 while ((skb = __skb_dequeue(&port->backlog)) != NULL) { 106 if (skb->dev) 107 dev_put(skb->dev); 108 kfree_skb(skb); 109 } 110 ida_destroy(&port->ida); 111 kfree(port); 112 } 113 114 #define IPVLAN_FEATURES \ 115 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 116 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_GSO_ROBUST | \ 117 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 118 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 119 120 #define IPVLAN_STATE_MASK \ 121 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 122 123 static int ipvlan_init(struct net_device *dev) 124 { 125 struct ipvl_dev *ipvlan = netdev_priv(dev); 126 struct net_device *phy_dev = ipvlan->phy_dev; 127 struct ipvl_port *port; 128 int err; 129 130 dev->state = (dev->state & ~IPVLAN_STATE_MASK) | 131 (phy_dev->state & IPVLAN_STATE_MASK); 132 dev->features = phy_dev->features & IPVLAN_FEATURES; 133 dev->features |= NETIF_F_LLTX | NETIF_F_VLAN_CHALLENGED; 134 dev->gso_max_size = phy_dev->gso_max_size; 135 dev->gso_max_segs = phy_dev->gso_max_segs; 136 dev->hard_header_len = phy_dev->hard_header_len; 137 138 netdev_lockdep_set_classes(dev); 139 140 ipvlan->pcpu_stats = netdev_alloc_pcpu_stats(struct ipvl_pcpu_stats); 141 if (!ipvlan->pcpu_stats) 142 return -ENOMEM; 143 144 if (!netif_is_ipvlan_port(phy_dev)) { 145 err = ipvlan_port_create(phy_dev); 146 if (err < 0) { 147 free_percpu(ipvlan->pcpu_stats); 148 return err; 149 } 150 } 151 port = ipvlan_port_get_rtnl(phy_dev); 152 port->count += 1; 153 return 0; 154 } 155 156 static void ipvlan_uninit(struct net_device *dev) 157 { 158 struct ipvl_dev *ipvlan = netdev_priv(dev); 159 struct net_device *phy_dev = ipvlan->phy_dev; 160 struct ipvl_port *port; 161 162 free_percpu(ipvlan->pcpu_stats); 163 164 port = ipvlan_port_get_rtnl(phy_dev); 165 port->count -= 1; 166 if (!port->count) 167 ipvlan_port_destroy(port->dev); 168 } 169 170 static int ipvlan_open(struct net_device *dev) 171 { 172 struct ipvl_dev *ipvlan = netdev_priv(dev); 173 struct net_device *phy_dev = ipvlan->phy_dev; 174 struct ipvl_addr *addr; 175 176 if (ipvlan->port->mode == IPVLAN_MODE_L3 || 177 ipvlan->port->mode == IPVLAN_MODE_L3S) 178 dev->flags |= IFF_NOARP; 179 else 180 dev->flags &= ~IFF_NOARP; 181 182 rcu_read_lock(); 183 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode) 184 ipvlan_ht_addr_add(ipvlan, addr); 185 rcu_read_unlock(); 186 187 return dev_uc_add(phy_dev, phy_dev->dev_addr); 188 } 189 190 static int ipvlan_stop(struct net_device *dev) 191 { 192 struct ipvl_dev *ipvlan = netdev_priv(dev); 193 struct net_device *phy_dev = ipvlan->phy_dev; 194 struct ipvl_addr *addr; 195 196 dev_uc_unsync(phy_dev, dev); 197 dev_mc_unsync(phy_dev, dev); 198 199 dev_uc_del(phy_dev, phy_dev->dev_addr); 200 201 rcu_read_lock(); 202 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode) 203 ipvlan_ht_addr_del(addr); 204 rcu_read_unlock(); 205 206 return 0; 207 } 208 209 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb, 210 struct net_device *dev) 211 { 212 const struct ipvl_dev *ipvlan = netdev_priv(dev); 213 int skblen = skb->len; 214 int ret; 215 216 ret = ipvlan_queue_xmit(skb, dev); 217 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 218 struct ipvl_pcpu_stats *pcptr; 219 220 pcptr = this_cpu_ptr(ipvlan->pcpu_stats); 221 222 u64_stats_update_begin(&pcptr->syncp); 223 pcptr->tx_pkts++; 224 pcptr->tx_bytes += skblen; 225 u64_stats_update_end(&pcptr->syncp); 226 } else { 227 this_cpu_inc(ipvlan->pcpu_stats->tx_drps); 228 } 229 return ret; 230 } 231 232 static netdev_features_t ipvlan_fix_features(struct net_device *dev, 233 netdev_features_t features) 234 { 235 struct ipvl_dev *ipvlan = netdev_priv(dev); 236 237 return features & (ipvlan->sfeatures | ~IPVLAN_FEATURES); 238 } 239 240 static void ipvlan_change_rx_flags(struct net_device *dev, int change) 241 { 242 struct ipvl_dev *ipvlan = netdev_priv(dev); 243 struct net_device *phy_dev = ipvlan->phy_dev; 244 245 if (change & IFF_ALLMULTI) 246 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1); 247 } 248 249 static void ipvlan_set_multicast_mac_filter(struct net_device *dev) 250 { 251 struct ipvl_dev *ipvlan = netdev_priv(dev); 252 253 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 254 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE); 255 } else { 256 struct netdev_hw_addr *ha; 257 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE); 258 259 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE); 260 netdev_for_each_mc_addr(ha, dev) 261 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters); 262 263 /* Turn-on broadcast bit irrespective of address family, 264 * since broadcast is deferred to a work-queue, hence no 265 * impact on fast-path processing. 266 */ 267 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters); 268 269 bitmap_copy(ipvlan->mac_filters, mc_filters, 270 IPVLAN_MAC_FILTER_SIZE); 271 } 272 dev_uc_sync(ipvlan->phy_dev, dev); 273 dev_mc_sync(ipvlan->phy_dev, dev); 274 } 275 276 static void ipvlan_get_stats64(struct net_device *dev, 277 struct rtnl_link_stats64 *s) 278 { 279 struct ipvl_dev *ipvlan = netdev_priv(dev); 280 281 if (ipvlan->pcpu_stats) { 282 struct ipvl_pcpu_stats *pcptr; 283 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes; 284 u32 rx_errs = 0, tx_drps = 0; 285 u32 strt; 286 int idx; 287 288 for_each_possible_cpu(idx) { 289 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx); 290 do { 291 strt= u64_stats_fetch_begin_irq(&pcptr->syncp); 292 rx_pkts = pcptr->rx_pkts; 293 rx_bytes = pcptr->rx_bytes; 294 rx_mcast = pcptr->rx_mcast; 295 tx_pkts = pcptr->tx_pkts; 296 tx_bytes = pcptr->tx_bytes; 297 } while (u64_stats_fetch_retry_irq(&pcptr->syncp, 298 strt)); 299 300 s->rx_packets += rx_pkts; 301 s->rx_bytes += rx_bytes; 302 s->multicast += rx_mcast; 303 s->tx_packets += tx_pkts; 304 s->tx_bytes += tx_bytes; 305 306 /* u32 values are updated without syncp protection. */ 307 rx_errs += pcptr->rx_errs; 308 tx_drps += pcptr->tx_drps; 309 } 310 s->rx_errors = rx_errs; 311 s->rx_dropped = rx_errs; 312 s->tx_dropped = tx_drps; 313 } 314 } 315 316 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid) 317 { 318 struct ipvl_dev *ipvlan = netdev_priv(dev); 319 struct net_device *phy_dev = ipvlan->phy_dev; 320 321 return vlan_vid_add(phy_dev, proto, vid); 322 } 323 324 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto, 325 u16 vid) 326 { 327 struct ipvl_dev *ipvlan = netdev_priv(dev); 328 struct net_device *phy_dev = ipvlan->phy_dev; 329 330 vlan_vid_del(phy_dev, proto, vid); 331 return 0; 332 } 333 334 static int ipvlan_get_iflink(const struct net_device *dev) 335 { 336 struct ipvl_dev *ipvlan = netdev_priv(dev); 337 338 return ipvlan->phy_dev->ifindex; 339 } 340 341 static const struct net_device_ops ipvlan_netdev_ops = { 342 .ndo_init = ipvlan_init, 343 .ndo_uninit = ipvlan_uninit, 344 .ndo_open = ipvlan_open, 345 .ndo_stop = ipvlan_stop, 346 .ndo_start_xmit = ipvlan_start_xmit, 347 .ndo_fix_features = ipvlan_fix_features, 348 .ndo_change_rx_flags = ipvlan_change_rx_flags, 349 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter, 350 .ndo_get_stats64 = ipvlan_get_stats64, 351 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid, 352 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid, 353 .ndo_get_iflink = ipvlan_get_iflink, 354 }; 355 356 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 357 unsigned short type, const void *daddr, 358 const void *saddr, unsigned len) 359 { 360 const struct ipvl_dev *ipvlan = netdev_priv(dev); 361 struct net_device *phy_dev = ipvlan->phy_dev; 362 363 /* TODO Probably use a different field than dev_addr so that the 364 * mac-address on the virtual device is portable and can be carried 365 * while the packets use the mac-addr on the physical device. 366 */ 367 return dev_hard_header(skb, phy_dev, type, daddr, 368 saddr ? : phy_dev->dev_addr, len); 369 } 370 371 static const struct header_ops ipvlan_header_ops = { 372 .create = ipvlan_hard_header, 373 .parse = eth_header_parse, 374 .cache = eth_header_cache, 375 .cache_update = eth_header_cache_update, 376 }; 377 378 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev) 379 { 380 ipvlan->dev->mtu = dev->mtu; 381 } 382 383 static bool netif_is_ipvlan(const struct net_device *dev) 384 { 385 /* both ipvlan and ipvtap devices use the same netdev_ops */ 386 return dev->netdev_ops == &ipvlan_netdev_ops; 387 } 388 389 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev, 390 struct ethtool_link_ksettings *cmd) 391 { 392 const struct ipvl_dev *ipvlan = netdev_priv(dev); 393 394 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd); 395 } 396 397 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev, 398 struct ethtool_drvinfo *drvinfo) 399 { 400 strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver)); 401 strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version)); 402 } 403 404 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev) 405 { 406 const struct ipvl_dev *ipvlan = netdev_priv(dev); 407 408 return ipvlan->msg_enable; 409 } 410 411 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value) 412 { 413 struct ipvl_dev *ipvlan = netdev_priv(dev); 414 415 ipvlan->msg_enable = value; 416 } 417 418 static const struct ethtool_ops ipvlan_ethtool_ops = { 419 .get_link = ethtool_op_get_link, 420 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings, 421 .get_drvinfo = ipvlan_ethtool_get_drvinfo, 422 .get_msglevel = ipvlan_ethtool_get_msglevel, 423 .set_msglevel = ipvlan_ethtool_set_msglevel, 424 }; 425 426 static int ipvlan_nl_changelink(struct net_device *dev, 427 struct nlattr *tb[], struct nlattr *data[], 428 struct netlink_ext_ack *extack) 429 { 430 struct ipvl_dev *ipvlan = netdev_priv(dev); 431 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 432 int err = 0; 433 434 if (!data) 435 return 0; 436 if (!ns_capable(dev_net(ipvlan->phy_dev)->user_ns, CAP_NET_ADMIN)) 437 return -EPERM; 438 439 if (data[IFLA_IPVLAN_MODE]) { 440 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 441 442 err = ipvlan_set_port_mode(port, nmode, extack); 443 } 444 445 if (!err && data[IFLA_IPVLAN_FLAGS]) { 446 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]); 447 448 if (flags & IPVLAN_F_PRIVATE) 449 ipvlan_mark_private(port); 450 else 451 ipvlan_clear_private(port); 452 453 if (flags & IPVLAN_F_VEPA) 454 ipvlan_mark_vepa(port); 455 else 456 ipvlan_clear_vepa(port); 457 } 458 459 return err; 460 } 461 462 static size_t ipvlan_nl_getsize(const struct net_device *dev) 463 { 464 return (0 465 + nla_total_size(2) /* IFLA_IPVLAN_MODE */ 466 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */ 467 ); 468 } 469 470 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[], 471 struct netlink_ext_ack *extack) 472 { 473 if (!data) 474 return 0; 475 476 if (data[IFLA_IPVLAN_MODE]) { 477 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 478 479 if (mode >= IPVLAN_MODE_MAX) 480 return -EINVAL; 481 } 482 if (data[IFLA_IPVLAN_FLAGS]) { 483 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]); 484 485 /* Only two bits are used at this moment. */ 486 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) 487 return -EINVAL; 488 /* Also both flags can't be active at the same time. */ 489 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) == 490 (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) 491 return -EINVAL; 492 } 493 494 return 0; 495 } 496 497 static int ipvlan_nl_fillinfo(struct sk_buff *skb, 498 const struct net_device *dev) 499 { 500 struct ipvl_dev *ipvlan = netdev_priv(dev); 501 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 502 int ret = -EINVAL; 503 504 if (!port) 505 goto err; 506 507 ret = -EMSGSIZE; 508 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode)) 509 goto err; 510 if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags)) 511 goto err; 512 513 return 0; 514 515 err: 516 return ret; 517 } 518 519 int ipvlan_link_new(struct net *src_net, struct net_device *dev, 520 struct nlattr *tb[], struct nlattr *data[], 521 struct netlink_ext_ack *extack) 522 { 523 struct ipvl_dev *ipvlan = netdev_priv(dev); 524 struct ipvl_port *port; 525 struct net_device *phy_dev; 526 int err; 527 u16 mode = IPVLAN_MODE_L3; 528 529 if (!tb[IFLA_LINK]) 530 return -EINVAL; 531 532 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 533 if (!phy_dev) 534 return -ENODEV; 535 536 if (netif_is_ipvlan(phy_dev)) { 537 struct ipvl_dev *tmp = netdev_priv(phy_dev); 538 539 phy_dev = tmp->phy_dev; 540 if (!ns_capable(dev_net(phy_dev)->user_ns, CAP_NET_ADMIN)) 541 return -EPERM; 542 } else if (!netif_is_ipvlan_port(phy_dev)) { 543 /* Exit early if the underlying link is invalid or busy */ 544 if (phy_dev->type != ARPHRD_ETHER || 545 phy_dev->flags & IFF_LOOPBACK) { 546 netdev_err(phy_dev, 547 "Master is either lo or non-ether device\n"); 548 return -EINVAL; 549 } 550 551 if (netdev_is_rx_handler_busy(phy_dev)) { 552 netdev_err(phy_dev, "Device is already in use.\n"); 553 return -EBUSY; 554 } 555 } 556 557 ipvlan->phy_dev = phy_dev; 558 ipvlan->dev = dev; 559 ipvlan->sfeatures = IPVLAN_FEATURES; 560 if (!tb[IFLA_MTU]) 561 ipvlan_adjust_mtu(ipvlan, phy_dev); 562 INIT_LIST_HEAD(&ipvlan->addrs); 563 spin_lock_init(&ipvlan->addrs_lock); 564 565 /* TODO Probably put random address here to be presented to the 566 * world but keep using the physical-dev address for the outgoing 567 * packets. 568 */ 569 memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN); 570 571 dev->priv_flags |= IFF_NO_RX_HANDLER; 572 573 err = register_netdevice(dev); 574 if (err < 0) 575 return err; 576 577 /* ipvlan_init() would have created the port, if required */ 578 port = ipvlan_port_get_rtnl(phy_dev); 579 ipvlan->port = port; 580 581 /* If the port-id base is at the MAX value, then wrap it around and 582 * begin from 0x1 again. This may be due to a busy system where lots 583 * of slaves are getting created and deleted. 584 */ 585 if (port->dev_id_start == 0xFFFE) 586 port->dev_id_start = 0x1; 587 588 /* Since L2 address is shared among all IPvlan slaves including 589 * master, use unique 16 bit dev-ids to diffentiate among them. 590 * Assign IDs between 0x1 and 0xFFFE (used by the master) to each 591 * slave link [see addrconf_ifid_eui48()]. 592 */ 593 err = ida_simple_get(&port->ida, port->dev_id_start, 0xFFFE, 594 GFP_KERNEL); 595 if (err < 0) 596 err = ida_simple_get(&port->ida, 0x1, port->dev_id_start, 597 GFP_KERNEL); 598 if (err < 0) 599 goto unregister_netdev; 600 dev->dev_id = err; 601 602 /* Increment id-base to the next slot for the future assignment */ 603 port->dev_id_start = err + 1; 604 605 err = netdev_upper_dev_link(phy_dev, dev, extack); 606 if (err) 607 goto remove_ida; 608 609 /* Flags are per port and latest update overrides. User has 610 * to be consistent in setting it just like the mode attribute. 611 */ 612 if (data && data[IFLA_IPVLAN_FLAGS]) 613 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]); 614 615 if (data && data[IFLA_IPVLAN_MODE]) 616 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 617 618 err = ipvlan_set_port_mode(port, mode, extack); 619 if (err) 620 goto unlink_netdev; 621 622 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans); 623 netif_stacked_transfer_operstate(phy_dev, dev); 624 return 0; 625 626 unlink_netdev: 627 netdev_upper_dev_unlink(phy_dev, dev); 628 remove_ida: 629 ida_simple_remove(&port->ida, dev->dev_id); 630 unregister_netdev: 631 unregister_netdevice(dev); 632 return err; 633 } 634 EXPORT_SYMBOL_GPL(ipvlan_link_new); 635 636 void ipvlan_link_delete(struct net_device *dev, struct list_head *head) 637 { 638 struct ipvl_dev *ipvlan = netdev_priv(dev); 639 struct ipvl_addr *addr, *next; 640 641 spin_lock_bh(&ipvlan->addrs_lock); 642 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) { 643 ipvlan_ht_addr_del(addr); 644 list_del_rcu(&addr->anode); 645 kfree_rcu(addr, rcu); 646 } 647 spin_unlock_bh(&ipvlan->addrs_lock); 648 649 ida_simple_remove(&ipvlan->port->ida, dev->dev_id); 650 list_del_rcu(&ipvlan->pnode); 651 unregister_netdevice_queue(dev, head); 652 netdev_upper_dev_unlink(ipvlan->phy_dev, dev); 653 } 654 EXPORT_SYMBOL_GPL(ipvlan_link_delete); 655 656 void ipvlan_link_setup(struct net_device *dev) 657 { 658 ether_setup(dev); 659 660 dev->max_mtu = ETH_MAX_MTU; 661 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 662 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE; 663 dev->netdev_ops = &ipvlan_netdev_ops; 664 dev->needs_free_netdev = true; 665 dev->header_ops = &ipvlan_header_ops; 666 dev->ethtool_ops = &ipvlan_ethtool_ops; 667 } 668 EXPORT_SYMBOL_GPL(ipvlan_link_setup); 669 670 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] = 671 { 672 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 }, 673 [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 }, 674 }; 675 676 static struct rtnl_link_ops ipvlan_link_ops = { 677 .kind = "ipvlan", 678 .priv_size = sizeof(struct ipvl_dev), 679 680 .setup = ipvlan_link_setup, 681 .newlink = ipvlan_link_new, 682 .dellink = ipvlan_link_delete, 683 }; 684 685 int ipvlan_link_register(struct rtnl_link_ops *ops) 686 { 687 ops->get_size = ipvlan_nl_getsize; 688 ops->policy = ipvlan_nl_policy; 689 ops->validate = ipvlan_nl_validate; 690 ops->fill_info = ipvlan_nl_fillinfo; 691 ops->changelink = ipvlan_nl_changelink; 692 ops->maxtype = IFLA_IPVLAN_MAX; 693 return rtnl_link_register(ops); 694 } 695 EXPORT_SYMBOL_GPL(ipvlan_link_register); 696 697 static int ipvlan_device_event(struct notifier_block *unused, 698 unsigned long event, void *ptr) 699 { 700 struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr); 701 struct netdev_notifier_pre_changeaddr_info *prechaddr_info; 702 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 703 struct ipvl_dev *ipvlan, *next; 704 struct ipvl_port *port; 705 LIST_HEAD(lst_kill); 706 int err; 707 708 if (!netif_is_ipvlan_port(dev)) 709 return NOTIFY_DONE; 710 711 port = ipvlan_port_get_rtnl(dev); 712 713 switch (event) { 714 case NETDEV_CHANGE: 715 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 716 netif_stacked_transfer_operstate(ipvlan->phy_dev, 717 ipvlan->dev); 718 break; 719 720 case NETDEV_REGISTER: { 721 struct net *oldnet, *newnet = dev_net(dev); 722 723 oldnet = read_pnet(&port->pnet); 724 if (net_eq(newnet, oldnet)) 725 break; 726 727 write_pnet(&port->pnet, newnet); 728 729 ipvlan_migrate_l3s_hook(oldnet, newnet); 730 break; 731 } 732 case NETDEV_UNREGISTER: 733 if (dev->reg_state != NETREG_UNREGISTERING) 734 break; 735 736 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode) 737 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev, 738 &lst_kill); 739 unregister_netdevice_many(&lst_kill); 740 break; 741 742 case NETDEV_FEAT_CHANGE: 743 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 744 ipvlan->dev->features = dev->features & IPVLAN_FEATURES; 745 ipvlan->dev->gso_max_size = dev->gso_max_size; 746 ipvlan->dev->gso_max_segs = dev->gso_max_segs; 747 netdev_features_change(ipvlan->dev); 748 } 749 break; 750 751 case NETDEV_CHANGEMTU: 752 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 753 ipvlan_adjust_mtu(ipvlan, dev); 754 break; 755 756 case NETDEV_PRE_CHANGEADDR: 757 prechaddr_info = ptr; 758 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 759 err = dev_pre_changeaddr_notify(ipvlan->dev, 760 prechaddr_info->dev_addr, 761 extack); 762 if (err) 763 return notifier_from_errno(err); 764 } 765 break; 766 767 case NETDEV_CHANGEADDR: 768 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 769 ether_addr_copy(ipvlan->dev->dev_addr, dev->dev_addr); 770 call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev); 771 } 772 break; 773 774 case NETDEV_PRE_TYPE_CHANGE: 775 /* Forbid underlying device to change its type. */ 776 return NOTIFY_BAD; 777 } 778 return NOTIFY_DONE; 779 } 780 781 /* the caller must held the addrs lock */ 782 static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6) 783 { 784 struct ipvl_addr *addr; 785 786 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC); 787 if (!addr) 788 return -ENOMEM; 789 790 addr->master = ipvlan; 791 if (!is_v6) { 792 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr)); 793 addr->atype = IPVL_IPV4; 794 #if IS_ENABLED(CONFIG_IPV6) 795 } else { 796 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr)); 797 addr->atype = IPVL_IPV6; 798 #endif 799 } 800 801 list_add_tail_rcu(&addr->anode, &ipvlan->addrs); 802 803 /* If the interface is not up, the address will be added to the hash 804 * list by ipvlan_open. 805 */ 806 if (netif_running(ipvlan->dev)) 807 ipvlan_ht_addr_add(ipvlan, addr); 808 809 return 0; 810 } 811 812 static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6) 813 { 814 struct ipvl_addr *addr; 815 816 spin_lock_bh(&ipvlan->addrs_lock); 817 addr = ipvlan_find_addr(ipvlan, iaddr, is_v6); 818 if (!addr) { 819 spin_unlock_bh(&ipvlan->addrs_lock); 820 return; 821 } 822 823 ipvlan_ht_addr_del(addr); 824 list_del_rcu(&addr->anode); 825 spin_unlock_bh(&ipvlan->addrs_lock); 826 kfree_rcu(addr, rcu); 827 } 828 829 static bool ipvlan_is_valid_dev(const struct net_device *dev) 830 { 831 struct ipvl_dev *ipvlan = netdev_priv(dev); 832 833 if (!netif_is_ipvlan(dev)) 834 return false; 835 836 if (!ipvlan || !ipvlan->port) 837 return false; 838 839 return true; 840 } 841 842 #if IS_ENABLED(CONFIG_IPV6) 843 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 844 { 845 int ret = -EINVAL; 846 847 spin_lock_bh(&ipvlan->addrs_lock); 848 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true)) 849 netif_err(ipvlan, ifup, ipvlan->dev, 850 "Failed to add IPv6=%pI6c addr for %s intf\n", 851 ip6_addr, ipvlan->dev->name); 852 else 853 ret = ipvlan_add_addr(ipvlan, ip6_addr, true); 854 spin_unlock_bh(&ipvlan->addrs_lock); 855 return ret; 856 } 857 858 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 859 { 860 return ipvlan_del_addr(ipvlan, ip6_addr, true); 861 } 862 863 static int ipvlan_addr6_event(struct notifier_block *unused, 864 unsigned long event, void *ptr) 865 { 866 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr; 867 struct net_device *dev = (struct net_device *)if6->idev->dev; 868 struct ipvl_dev *ipvlan = netdev_priv(dev); 869 870 if (!ipvlan_is_valid_dev(dev)) 871 return NOTIFY_DONE; 872 873 switch (event) { 874 case NETDEV_UP: 875 if (ipvlan_add_addr6(ipvlan, &if6->addr)) 876 return NOTIFY_BAD; 877 break; 878 879 case NETDEV_DOWN: 880 ipvlan_del_addr6(ipvlan, &if6->addr); 881 break; 882 } 883 884 return NOTIFY_OK; 885 } 886 887 static int ipvlan_addr6_validator_event(struct notifier_block *unused, 888 unsigned long event, void *ptr) 889 { 890 struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr; 891 struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev; 892 struct ipvl_dev *ipvlan = netdev_priv(dev); 893 894 if (!ipvlan_is_valid_dev(dev)) 895 return NOTIFY_DONE; 896 897 switch (event) { 898 case NETDEV_UP: 899 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) { 900 NL_SET_ERR_MSG(i6vi->extack, 901 "Address already assigned to an ipvlan device"); 902 return notifier_from_errno(-EADDRINUSE); 903 } 904 break; 905 } 906 907 return NOTIFY_OK; 908 } 909 #endif 910 911 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 912 { 913 int ret = -EINVAL; 914 915 spin_lock_bh(&ipvlan->addrs_lock); 916 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false)) 917 netif_err(ipvlan, ifup, ipvlan->dev, 918 "Failed to add IPv4=%pI4 on %s intf.\n", 919 ip4_addr, ipvlan->dev->name); 920 else 921 ret = ipvlan_add_addr(ipvlan, ip4_addr, false); 922 spin_unlock_bh(&ipvlan->addrs_lock); 923 return ret; 924 } 925 926 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 927 { 928 return ipvlan_del_addr(ipvlan, ip4_addr, false); 929 } 930 931 static int ipvlan_addr4_event(struct notifier_block *unused, 932 unsigned long event, void *ptr) 933 { 934 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr; 935 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev; 936 struct ipvl_dev *ipvlan = netdev_priv(dev); 937 struct in_addr ip4_addr; 938 939 if (!ipvlan_is_valid_dev(dev)) 940 return NOTIFY_DONE; 941 942 switch (event) { 943 case NETDEV_UP: 944 ip4_addr.s_addr = if4->ifa_address; 945 if (ipvlan_add_addr4(ipvlan, &ip4_addr)) 946 return NOTIFY_BAD; 947 break; 948 949 case NETDEV_DOWN: 950 ip4_addr.s_addr = if4->ifa_address; 951 ipvlan_del_addr4(ipvlan, &ip4_addr); 952 break; 953 } 954 955 return NOTIFY_OK; 956 } 957 958 static int ipvlan_addr4_validator_event(struct notifier_block *unused, 959 unsigned long event, void *ptr) 960 { 961 struct in_validator_info *ivi = (struct in_validator_info *)ptr; 962 struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev; 963 struct ipvl_dev *ipvlan = netdev_priv(dev); 964 965 if (!ipvlan_is_valid_dev(dev)) 966 return NOTIFY_DONE; 967 968 switch (event) { 969 case NETDEV_UP: 970 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) { 971 NL_SET_ERR_MSG(ivi->extack, 972 "Address already assigned to an ipvlan device"); 973 return notifier_from_errno(-EADDRINUSE); 974 } 975 break; 976 } 977 978 return NOTIFY_OK; 979 } 980 981 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = { 982 .notifier_call = ipvlan_addr4_event, 983 }; 984 985 static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = { 986 .notifier_call = ipvlan_addr4_validator_event, 987 }; 988 989 static struct notifier_block ipvlan_notifier_block __read_mostly = { 990 .notifier_call = ipvlan_device_event, 991 }; 992 993 #if IS_ENABLED(CONFIG_IPV6) 994 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = { 995 .notifier_call = ipvlan_addr6_event, 996 }; 997 998 static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = { 999 .notifier_call = ipvlan_addr6_validator_event, 1000 }; 1001 #endif 1002 1003 static int __init ipvlan_init_module(void) 1004 { 1005 int err; 1006 1007 ipvlan_init_secret(); 1008 register_netdevice_notifier(&ipvlan_notifier_block); 1009 #if IS_ENABLED(CONFIG_IPV6) 1010 register_inet6addr_notifier(&ipvlan_addr6_notifier_block); 1011 register_inet6addr_validator_notifier( 1012 &ipvlan_addr6_vtor_notifier_block); 1013 #endif 1014 register_inetaddr_notifier(&ipvlan_addr4_notifier_block); 1015 register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block); 1016 1017 err = ipvlan_l3s_init(); 1018 if (err < 0) 1019 goto error; 1020 1021 err = ipvlan_link_register(&ipvlan_link_ops); 1022 if (err < 0) { 1023 ipvlan_l3s_cleanup(); 1024 goto error; 1025 } 1026 1027 return 0; 1028 error: 1029 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block); 1030 unregister_inetaddr_validator_notifier( 1031 &ipvlan_addr4_vtor_notifier_block); 1032 #if IS_ENABLED(CONFIG_IPV6) 1033 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block); 1034 unregister_inet6addr_validator_notifier( 1035 &ipvlan_addr6_vtor_notifier_block); 1036 #endif 1037 unregister_netdevice_notifier(&ipvlan_notifier_block); 1038 return err; 1039 } 1040 1041 static void __exit ipvlan_cleanup_module(void) 1042 { 1043 rtnl_link_unregister(&ipvlan_link_ops); 1044 ipvlan_l3s_cleanup(); 1045 unregister_netdevice_notifier(&ipvlan_notifier_block); 1046 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block); 1047 unregister_inetaddr_validator_notifier( 1048 &ipvlan_addr4_vtor_notifier_block); 1049 #if IS_ENABLED(CONFIG_IPV6) 1050 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block); 1051 unregister_inet6addr_validator_notifier( 1052 &ipvlan_addr6_vtor_notifier_block); 1053 #endif 1054 } 1055 1056 module_init(ipvlan_init_module); 1057 module_exit(ipvlan_cleanup_module); 1058 1059 MODULE_LICENSE("GPL"); 1060 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>"); 1061 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs"); 1062 MODULE_ALIAS_RTNL_LINK("ipvlan"); 1063