1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com> 3 */ 4 5 #include "ipvlan.h" 6 7 static int ipvlan_set_port_mode(struct ipvl_port *port, u16 nval, 8 struct netlink_ext_ack *extack) 9 { 10 struct ipvl_dev *ipvlan; 11 unsigned int flags; 12 int err; 13 14 ASSERT_RTNL(); 15 if (port->mode != nval) { 16 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 17 flags = ipvlan->dev->flags; 18 if (nval == IPVLAN_MODE_L3 || nval == IPVLAN_MODE_L3S) { 19 err = dev_change_flags(ipvlan->dev, 20 flags | IFF_NOARP, 21 extack); 22 } else { 23 err = dev_change_flags(ipvlan->dev, 24 flags & ~IFF_NOARP, 25 extack); 26 } 27 if (unlikely(err)) 28 goto fail; 29 } 30 if (nval == IPVLAN_MODE_L3S) { 31 /* New mode is L3S */ 32 err = ipvlan_l3s_register(port); 33 if (err) 34 goto fail; 35 } else if (port->mode == IPVLAN_MODE_L3S) { 36 /* Old mode was L3S */ 37 ipvlan_l3s_unregister(port); 38 } 39 port->mode = nval; 40 } 41 return 0; 42 43 fail: 44 /* Undo the flags changes that have been done so far. */ 45 list_for_each_entry_continue_reverse(ipvlan, &port->ipvlans, pnode) { 46 flags = ipvlan->dev->flags; 47 if (port->mode == IPVLAN_MODE_L3 || 48 port->mode == IPVLAN_MODE_L3S) 49 dev_change_flags(ipvlan->dev, flags | IFF_NOARP, 50 NULL); 51 else 52 dev_change_flags(ipvlan->dev, flags & ~IFF_NOARP, 53 NULL); 54 } 55 56 return err; 57 } 58 59 static int ipvlan_port_create(struct net_device *dev) 60 { 61 struct ipvl_port *port; 62 int err, idx; 63 64 port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL); 65 if (!port) 66 return -ENOMEM; 67 68 write_pnet(&port->pnet, dev_net(dev)); 69 port->dev = dev; 70 port->mode = IPVLAN_MODE_L3; 71 INIT_LIST_HEAD(&port->ipvlans); 72 for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++) 73 INIT_HLIST_HEAD(&port->hlhead[idx]); 74 75 skb_queue_head_init(&port->backlog); 76 INIT_WORK(&port->wq, ipvlan_process_multicast); 77 ida_init(&port->ida); 78 port->dev_id_start = 1; 79 80 err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port); 81 if (err) 82 goto err; 83 84 return 0; 85 86 err: 87 kfree(port); 88 return err; 89 } 90 91 static void ipvlan_port_destroy(struct net_device *dev) 92 { 93 struct ipvl_port *port = ipvlan_port_get_rtnl(dev); 94 struct sk_buff *skb; 95 96 if (port->mode == IPVLAN_MODE_L3S) 97 ipvlan_l3s_unregister(port); 98 netdev_rx_handler_unregister(dev); 99 cancel_work_sync(&port->wq); 100 while ((skb = __skb_dequeue(&port->backlog)) != NULL) { 101 if (skb->dev) 102 dev_put(skb->dev); 103 kfree_skb(skb); 104 } 105 ida_destroy(&port->ida); 106 kfree(port); 107 } 108 109 #define IPVLAN_FEATURES \ 110 (NETIF_F_SG | NETIF_F_CSUM_MASK | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 111 NETIF_F_GSO | NETIF_F_ALL_TSO | NETIF_F_GSO_ROBUST | \ 112 NETIF_F_GRO | NETIF_F_RXCSUM | \ 113 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 114 115 #define IPVLAN_STATE_MASK \ 116 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 117 118 static int ipvlan_init(struct net_device *dev) 119 { 120 struct ipvl_dev *ipvlan = netdev_priv(dev); 121 struct net_device *phy_dev = ipvlan->phy_dev; 122 struct ipvl_port *port; 123 int err; 124 125 dev->state = (dev->state & ~IPVLAN_STATE_MASK) | 126 (phy_dev->state & IPVLAN_STATE_MASK); 127 dev->features = phy_dev->features & IPVLAN_FEATURES; 128 dev->features |= NETIF_F_LLTX | NETIF_F_VLAN_CHALLENGED; 129 dev->hw_enc_features |= dev->features; 130 dev->gso_max_size = phy_dev->gso_max_size; 131 dev->gso_max_segs = phy_dev->gso_max_segs; 132 dev->hard_header_len = phy_dev->hard_header_len; 133 134 netdev_lockdep_set_classes(dev); 135 136 ipvlan->pcpu_stats = netdev_alloc_pcpu_stats(struct ipvl_pcpu_stats); 137 if (!ipvlan->pcpu_stats) 138 return -ENOMEM; 139 140 if (!netif_is_ipvlan_port(phy_dev)) { 141 err = ipvlan_port_create(phy_dev); 142 if (err < 0) { 143 free_percpu(ipvlan->pcpu_stats); 144 return err; 145 } 146 } 147 port = ipvlan_port_get_rtnl(phy_dev); 148 port->count += 1; 149 return 0; 150 } 151 152 static void ipvlan_uninit(struct net_device *dev) 153 { 154 struct ipvl_dev *ipvlan = netdev_priv(dev); 155 struct net_device *phy_dev = ipvlan->phy_dev; 156 struct ipvl_port *port; 157 158 free_percpu(ipvlan->pcpu_stats); 159 160 port = ipvlan_port_get_rtnl(phy_dev); 161 port->count -= 1; 162 if (!port->count) 163 ipvlan_port_destroy(port->dev); 164 } 165 166 static int ipvlan_open(struct net_device *dev) 167 { 168 struct ipvl_dev *ipvlan = netdev_priv(dev); 169 struct ipvl_addr *addr; 170 171 if (ipvlan->port->mode == IPVLAN_MODE_L3 || 172 ipvlan->port->mode == IPVLAN_MODE_L3S) 173 dev->flags |= IFF_NOARP; 174 else 175 dev->flags &= ~IFF_NOARP; 176 177 rcu_read_lock(); 178 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode) 179 ipvlan_ht_addr_add(ipvlan, addr); 180 rcu_read_unlock(); 181 182 return 0; 183 } 184 185 static int ipvlan_stop(struct net_device *dev) 186 { 187 struct ipvl_dev *ipvlan = netdev_priv(dev); 188 struct net_device *phy_dev = ipvlan->phy_dev; 189 struct ipvl_addr *addr; 190 191 dev_uc_unsync(phy_dev, dev); 192 dev_mc_unsync(phy_dev, dev); 193 194 rcu_read_lock(); 195 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode) 196 ipvlan_ht_addr_del(addr); 197 rcu_read_unlock(); 198 199 return 0; 200 } 201 202 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb, 203 struct net_device *dev) 204 { 205 const struct ipvl_dev *ipvlan = netdev_priv(dev); 206 int skblen = skb->len; 207 int ret; 208 209 ret = ipvlan_queue_xmit(skb, dev); 210 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 211 struct ipvl_pcpu_stats *pcptr; 212 213 pcptr = this_cpu_ptr(ipvlan->pcpu_stats); 214 215 u64_stats_update_begin(&pcptr->syncp); 216 pcptr->tx_pkts++; 217 pcptr->tx_bytes += skblen; 218 u64_stats_update_end(&pcptr->syncp); 219 } else { 220 this_cpu_inc(ipvlan->pcpu_stats->tx_drps); 221 } 222 return ret; 223 } 224 225 static netdev_features_t ipvlan_fix_features(struct net_device *dev, 226 netdev_features_t features) 227 { 228 struct ipvl_dev *ipvlan = netdev_priv(dev); 229 230 return features & (ipvlan->sfeatures | ~IPVLAN_FEATURES); 231 } 232 233 static void ipvlan_change_rx_flags(struct net_device *dev, int change) 234 { 235 struct ipvl_dev *ipvlan = netdev_priv(dev); 236 struct net_device *phy_dev = ipvlan->phy_dev; 237 238 if (change & IFF_ALLMULTI) 239 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1); 240 } 241 242 static void ipvlan_set_multicast_mac_filter(struct net_device *dev) 243 { 244 struct ipvl_dev *ipvlan = netdev_priv(dev); 245 246 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 247 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE); 248 } else { 249 struct netdev_hw_addr *ha; 250 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE); 251 252 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE); 253 netdev_for_each_mc_addr(ha, dev) 254 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters); 255 256 /* Turn-on broadcast bit irrespective of address family, 257 * since broadcast is deferred to a work-queue, hence no 258 * impact on fast-path processing. 259 */ 260 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters); 261 262 bitmap_copy(ipvlan->mac_filters, mc_filters, 263 IPVLAN_MAC_FILTER_SIZE); 264 } 265 dev_uc_sync(ipvlan->phy_dev, dev); 266 dev_mc_sync(ipvlan->phy_dev, dev); 267 } 268 269 static void ipvlan_get_stats64(struct net_device *dev, 270 struct rtnl_link_stats64 *s) 271 { 272 struct ipvl_dev *ipvlan = netdev_priv(dev); 273 274 if (ipvlan->pcpu_stats) { 275 struct ipvl_pcpu_stats *pcptr; 276 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes; 277 u32 rx_errs = 0, tx_drps = 0; 278 u32 strt; 279 int idx; 280 281 for_each_possible_cpu(idx) { 282 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx); 283 do { 284 strt= u64_stats_fetch_begin_irq(&pcptr->syncp); 285 rx_pkts = pcptr->rx_pkts; 286 rx_bytes = pcptr->rx_bytes; 287 rx_mcast = pcptr->rx_mcast; 288 tx_pkts = pcptr->tx_pkts; 289 tx_bytes = pcptr->tx_bytes; 290 } while (u64_stats_fetch_retry_irq(&pcptr->syncp, 291 strt)); 292 293 s->rx_packets += rx_pkts; 294 s->rx_bytes += rx_bytes; 295 s->multicast += rx_mcast; 296 s->tx_packets += tx_pkts; 297 s->tx_bytes += tx_bytes; 298 299 /* u32 values are updated without syncp protection. */ 300 rx_errs += pcptr->rx_errs; 301 tx_drps += pcptr->tx_drps; 302 } 303 s->rx_errors = rx_errs; 304 s->rx_dropped = rx_errs; 305 s->tx_dropped = tx_drps; 306 } 307 } 308 309 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid) 310 { 311 struct ipvl_dev *ipvlan = netdev_priv(dev); 312 struct net_device *phy_dev = ipvlan->phy_dev; 313 314 return vlan_vid_add(phy_dev, proto, vid); 315 } 316 317 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto, 318 u16 vid) 319 { 320 struct ipvl_dev *ipvlan = netdev_priv(dev); 321 struct net_device *phy_dev = ipvlan->phy_dev; 322 323 vlan_vid_del(phy_dev, proto, vid); 324 return 0; 325 } 326 327 static int ipvlan_get_iflink(const struct net_device *dev) 328 { 329 struct ipvl_dev *ipvlan = netdev_priv(dev); 330 331 return ipvlan->phy_dev->ifindex; 332 } 333 334 static const struct net_device_ops ipvlan_netdev_ops = { 335 .ndo_init = ipvlan_init, 336 .ndo_uninit = ipvlan_uninit, 337 .ndo_open = ipvlan_open, 338 .ndo_stop = ipvlan_stop, 339 .ndo_start_xmit = ipvlan_start_xmit, 340 .ndo_fix_features = ipvlan_fix_features, 341 .ndo_change_rx_flags = ipvlan_change_rx_flags, 342 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter, 343 .ndo_get_stats64 = ipvlan_get_stats64, 344 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid, 345 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid, 346 .ndo_get_iflink = ipvlan_get_iflink, 347 }; 348 349 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 350 unsigned short type, const void *daddr, 351 const void *saddr, unsigned len) 352 { 353 const struct ipvl_dev *ipvlan = netdev_priv(dev); 354 struct net_device *phy_dev = ipvlan->phy_dev; 355 356 /* TODO Probably use a different field than dev_addr so that the 357 * mac-address on the virtual device is portable and can be carried 358 * while the packets use the mac-addr on the physical device. 359 */ 360 return dev_hard_header(skb, phy_dev, type, daddr, 361 saddr ? : phy_dev->dev_addr, len); 362 } 363 364 static const struct header_ops ipvlan_header_ops = { 365 .create = ipvlan_hard_header, 366 .parse = eth_header_parse, 367 .cache = eth_header_cache, 368 .cache_update = eth_header_cache_update, 369 }; 370 371 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev) 372 { 373 ipvlan->dev->mtu = dev->mtu; 374 } 375 376 static bool netif_is_ipvlan(const struct net_device *dev) 377 { 378 /* both ipvlan and ipvtap devices use the same netdev_ops */ 379 return dev->netdev_ops == &ipvlan_netdev_ops; 380 } 381 382 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev, 383 struct ethtool_link_ksettings *cmd) 384 { 385 const struct ipvl_dev *ipvlan = netdev_priv(dev); 386 387 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd); 388 } 389 390 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev, 391 struct ethtool_drvinfo *drvinfo) 392 { 393 strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver)); 394 strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version)); 395 } 396 397 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev) 398 { 399 const struct ipvl_dev *ipvlan = netdev_priv(dev); 400 401 return ipvlan->msg_enable; 402 } 403 404 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value) 405 { 406 struct ipvl_dev *ipvlan = netdev_priv(dev); 407 408 ipvlan->msg_enable = value; 409 } 410 411 static const struct ethtool_ops ipvlan_ethtool_ops = { 412 .get_link = ethtool_op_get_link, 413 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings, 414 .get_drvinfo = ipvlan_ethtool_get_drvinfo, 415 .get_msglevel = ipvlan_ethtool_get_msglevel, 416 .set_msglevel = ipvlan_ethtool_set_msglevel, 417 }; 418 419 static int ipvlan_nl_changelink(struct net_device *dev, 420 struct nlattr *tb[], struct nlattr *data[], 421 struct netlink_ext_ack *extack) 422 { 423 struct ipvl_dev *ipvlan = netdev_priv(dev); 424 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 425 int err = 0; 426 427 if (!data) 428 return 0; 429 if (!ns_capable(dev_net(ipvlan->phy_dev)->user_ns, CAP_NET_ADMIN)) 430 return -EPERM; 431 432 if (data[IFLA_IPVLAN_MODE]) { 433 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 434 435 err = ipvlan_set_port_mode(port, nmode, extack); 436 } 437 438 if (!err && data[IFLA_IPVLAN_FLAGS]) { 439 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]); 440 441 if (flags & IPVLAN_F_PRIVATE) 442 ipvlan_mark_private(port); 443 else 444 ipvlan_clear_private(port); 445 446 if (flags & IPVLAN_F_VEPA) 447 ipvlan_mark_vepa(port); 448 else 449 ipvlan_clear_vepa(port); 450 } 451 452 return err; 453 } 454 455 static size_t ipvlan_nl_getsize(const struct net_device *dev) 456 { 457 return (0 458 + nla_total_size(2) /* IFLA_IPVLAN_MODE */ 459 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */ 460 ); 461 } 462 463 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[], 464 struct netlink_ext_ack *extack) 465 { 466 if (!data) 467 return 0; 468 469 if (data[IFLA_IPVLAN_MODE]) { 470 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 471 472 if (mode >= IPVLAN_MODE_MAX) 473 return -EINVAL; 474 } 475 if (data[IFLA_IPVLAN_FLAGS]) { 476 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]); 477 478 /* Only two bits are used at this moment. */ 479 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) 480 return -EINVAL; 481 /* Also both flags can't be active at the same time. */ 482 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) == 483 (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) 484 return -EINVAL; 485 } 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 if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags)) 504 goto err; 505 506 return 0; 507 508 err: 509 return ret; 510 } 511 512 int ipvlan_link_new(struct net *src_net, struct net_device *dev, 513 struct nlattr *tb[], struct nlattr *data[], 514 struct netlink_ext_ack *extack) 515 { 516 struct ipvl_dev *ipvlan = netdev_priv(dev); 517 struct ipvl_port *port; 518 struct net_device *phy_dev; 519 int err; 520 u16 mode = IPVLAN_MODE_L3; 521 522 if (!tb[IFLA_LINK]) 523 return -EINVAL; 524 525 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 526 if (!phy_dev) 527 return -ENODEV; 528 529 if (netif_is_ipvlan(phy_dev)) { 530 struct ipvl_dev *tmp = netdev_priv(phy_dev); 531 532 phy_dev = tmp->phy_dev; 533 if (!ns_capable(dev_net(phy_dev)->user_ns, CAP_NET_ADMIN)) 534 return -EPERM; 535 } else if (!netif_is_ipvlan_port(phy_dev)) { 536 /* Exit early if the underlying link is invalid or busy */ 537 if (phy_dev->type != ARPHRD_ETHER || 538 phy_dev->flags & IFF_LOOPBACK) { 539 netdev_err(phy_dev, 540 "Master is either lo or non-ether device\n"); 541 return -EINVAL; 542 } 543 544 if (netdev_is_rx_handler_busy(phy_dev)) { 545 netdev_err(phy_dev, "Device is already in use.\n"); 546 return -EBUSY; 547 } 548 } 549 550 ipvlan->phy_dev = phy_dev; 551 ipvlan->dev = dev; 552 ipvlan->sfeatures = IPVLAN_FEATURES; 553 if (!tb[IFLA_MTU]) 554 ipvlan_adjust_mtu(ipvlan, phy_dev); 555 INIT_LIST_HEAD(&ipvlan->addrs); 556 spin_lock_init(&ipvlan->addrs_lock); 557 558 /* TODO Probably put random address here to be presented to the 559 * world but keep using the physical-dev address for the outgoing 560 * packets. 561 */ 562 memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN); 563 564 dev->priv_flags |= IFF_NO_RX_HANDLER; 565 566 err = register_netdevice(dev); 567 if (err < 0) 568 return err; 569 570 /* ipvlan_init() would have created the port, if required */ 571 port = ipvlan_port_get_rtnl(phy_dev); 572 ipvlan->port = port; 573 574 /* If the port-id base is at the MAX value, then wrap it around and 575 * begin from 0x1 again. This may be due to a busy system where lots 576 * of slaves are getting created and deleted. 577 */ 578 if (port->dev_id_start == 0xFFFE) 579 port->dev_id_start = 0x1; 580 581 /* Since L2 address is shared among all IPvlan slaves including 582 * master, use unique 16 bit dev-ids to diffentiate among them. 583 * Assign IDs between 0x1 and 0xFFFE (used by the master) to each 584 * slave link [see addrconf_ifid_eui48()]. 585 */ 586 err = ida_simple_get(&port->ida, port->dev_id_start, 0xFFFE, 587 GFP_KERNEL); 588 if (err < 0) 589 err = ida_simple_get(&port->ida, 0x1, port->dev_id_start, 590 GFP_KERNEL); 591 if (err < 0) 592 goto unregister_netdev; 593 dev->dev_id = err; 594 595 /* Increment id-base to the next slot for the future assignment */ 596 port->dev_id_start = err + 1; 597 598 err = netdev_upper_dev_link(phy_dev, dev, extack); 599 if (err) 600 goto remove_ida; 601 602 /* Flags are per port and latest update overrides. User has 603 * to be consistent in setting it just like the mode attribute. 604 */ 605 if (data && data[IFLA_IPVLAN_FLAGS]) 606 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]); 607 608 if (data && data[IFLA_IPVLAN_MODE]) 609 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 610 611 err = ipvlan_set_port_mode(port, mode, extack); 612 if (err) 613 goto unlink_netdev; 614 615 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans); 616 netif_stacked_transfer_operstate(phy_dev, dev); 617 return 0; 618 619 unlink_netdev: 620 netdev_upper_dev_unlink(phy_dev, dev); 621 remove_ida: 622 ida_simple_remove(&port->ida, dev->dev_id); 623 unregister_netdev: 624 unregister_netdevice(dev); 625 return err; 626 } 627 EXPORT_SYMBOL_GPL(ipvlan_link_new); 628 629 void ipvlan_link_delete(struct net_device *dev, struct list_head *head) 630 { 631 struct ipvl_dev *ipvlan = netdev_priv(dev); 632 struct ipvl_addr *addr, *next; 633 634 spin_lock_bh(&ipvlan->addrs_lock); 635 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) { 636 ipvlan_ht_addr_del(addr); 637 list_del_rcu(&addr->anode); 638 kfree_rcu(addr, rcu); 639 } 640 spin_unlock_bh(&ipvlan->addrs_lock); 641 642 ida_simple_remove(&ipvlan->port->ida, dev->dev_id); 643 list_del_rcu(&ipvlan->pnode); 644 unregister_netdevice_queue(dev, head); 645 netdev_upper_dev_unlink(ipvlan->phy_dev, dev); 646 } 647 EXPORT_SYMBOL_GPL(ipvlan_link_delete); 648 649 void ipvlan_link_setup(struct net_device *dev) 650 { 651 ether_setup(dev); 652 653 dev->max_mtu = ETH_MAX_MTU; 654 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 655 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE; 656 dev->netdev_ops = &ipvlan_netdev_ops; 657 dev->needs_free_netdev = true; 658 dev->header_ops = &ipvlan_header_ops; 659 dev->ethtool_ops = &ipvlan_ethtool_ops; 660 } 661 EXPORT_SYMBOL_GPL(ipvlan_link_setup); 662 663 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] = 664 { 665 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 }, 666 [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 }, 667 }; 668 669 static struct rtnl_link_ops ipvlan_link_ops = { 670 .kind = "ipvlan", 671 .priv_size = sizeof(struct ipvl_dev), 672 673 .setup = ipvlan_link_setup, 674 .newlink = ipvlan_link_new, 675 .dellink = ipvlan_link_delete, 676 }; 677 678 int ipvlan_link_register(struct rtnl_link_ops *ops) 679 { 680 ops->get_size = ipvlan_nl_getsize; 681 ops->policy = ipvlan_nl_policy; 682 ops->validate = ipvlan_nl_validate; 683 ops->fill_info = ipvlan_nl_fillinfo; 684 ops->changelink = ipvlan_nl_changelink; 685 ops->maxtype = IFLA_IPVLAN_MAX; 686 return rtnl_link_register(ops); 687 } 688 EXPORT_SYMBOL_GPL(ipvlan_link_register); 689 690 static int ipvlan_device_event(struct notifier_block *unused, 691 unsigned long event, void *ptr) 692 { 693 struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr); 694 struct netdev_notifier_pre_changeaddr_info *prechaddr_info; 695 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 696 struct ipvl_dev *ipvlan, *next; 697 struct ipvl_port *port; 698 LIST_HEAD(lst_kill); 699 int err; 700 701 if (!netif_is_ipvlan_port(dev)) 702 return NOTIFY_DONE; 703 704 port = ipvlan_port_get_rtnl(dev); 705 706 switch (event) { 707 case NETDEV_CHANGE: 708 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 709 netif_stacked_transfer_operstate(ipvlan->phy_dev, 710 ipvlan->dev); 711 break; 712 713 case NETDEV_REGISTER: { 714 struct net *oldnet, *newnet = dev_net(dev); 715 716 oldnet = read_pnet(&port->pnet); 717 if (net_eq(newnet, oldnet)) 718 break; 719 720 write_pnet(&port->pnet, newnet); 721 722 ipvlan_migrate_l3s_hook(oldnet, newnet); 723 break; 724 } 725 case NETDEV_UNREGISTER: 726 if (dev->reg_state != NETREG_UNREGISTERING) 727 break; 728 729 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode) 730 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev, 731 &lst_kill); 732 unregister_netdevice_many(&lst_kill); 733 break; 734 735 case NETDEV_FEAT_CHANGE: 736 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 737 ipvlan->dev->features = dev->features & IPVLAN_FEATURES; 738 ipvlan->dev->gso_max_size = dev->gso_max_size; 739 ipvlan->dev->gso_max_segs = dev->gso_max_segs; 740 netdev_features_change(ipvlan->dev); 741 } 742 break; 743 744 case NETDEV_CHANGEMTU: 745 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 746 ipvlan_adjust_mtu(ipvlan, dev); 747 break; 748 749 case NETDEV_PRE_CHANGEADDR: 750 prechaddr_info = ptr; 751 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 752 err = dev_pre_changeaddr_notify(ipvlan->dev, 753 prechaddr_info->dev_addr, 754 extack); 755 if (err) 756 return notifier_from_errno(err); 757 } 758 break; 759 760 case NETDEV_CHANGEADDR: 761 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 762 ether_addr_copy(ipvlan->dev->dev_addr, dev->dev_addr); 763 call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev); 764 } 765 break; 766 767 case NETDEV_PRE_TYPE_CHANGE: 768 /* Forbid underlying device to change its type. */ 769 return NOTIFY_BAD; 770 } 771 return NOTIFY_DONE; 772 } 773 774 /* the caller must held the addrs lock */ 775 static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6) 776 { 777 struct ipvl_addr *addr; 778 779 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC); 780 if (!addr) 781 return -ENOMEM; 782 783 addr->master = ipvlan; 784 if (!is_v6) { 785 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr)); 786 addr->atype = IPVL_IPV4; 787 #if IS_ENABLED(CONFIG_IPV6) 788 } else { 789 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr)); 790 addr->atype = IPVL_IPV6; 791 #endif 792 } 793 794 list_add_tail_rcu(&addr->anode, &ipvlan->addrs); 795 796 /* If the interface is not up, the address will be added to the hash 797 * list by ipvlan_open. 798 */ 799 if (netif_running(ipvlan->dev)) 800 ipvlan_ht_addr_add(ipvlan, addr); 801 802 return 0; 803 } 804 805 static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6) 806 { 807 struct ipvl_addr *addr; 808 809 spin_lock_bh(&ipvlan->addrs_lock); 810 addr = ipvlan_find_addr(ipvlan, iaddr, is_v6); 811 if (!addr) { 812 spin_unlock_bh(&ipvlan->addrs_lock); 813 return; 814 } 815 816 ipvlan_ht_addr_del(addr); 817 list_del_rcu(&addr->anode); 818 spin_unlock_bh(&ipvlan->addrs_lock); 819 kfree_rcu(addr, rcu); 820 } 821 822 static bool ipvlan_is_valid_dev(const struct net_device *dev) 823 { 824 struct ipvl_dev *ipvlan = netdev_priv(dev); 825 826 if (!netif_is_ipvlan(dev)) 827 return false; 828 829 if (!ipvlan || !ipvlan->port) 830 return false; 831 832 return true; 833 } 834 835 #if IS_ENABLED(CONFIG_IPV6) 836 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 837 { 838 int ret = -EINVAL; 839 840 spin_lock_bh(&ipvlan->addrs_lock); 841 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true)) 842 netif_err(ipvlan, ifup, ipvlan->dev, 843 "Failed to add IPv6=%pI6c addr for %s intf\n", 844 ip6_addr, ipvlan->dev->name); 845 else 846 ret = ipvlan_add_addr(ipvlan, ip6_addr, true); 847 spin_unlock_bh(&ipvlan->addrs_lock); 848 return ret; 849 } 850 851 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 852 { 853 return ipvlan_del_addr(ipvlan, ip6_addr, true); 854 } 855 856 static int ipvlan_addr6_event(struct notifier_block *unused, 857 unsigned long event, void *ptr) 858 { 859 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr; 860 struct net_device *dev = (struct net_device *)if6->idev->dev; 861 struct ipvl_dev *ipvlan = netdev_priv(dev); 862 863 if (!ipvlan_is_valid_dev(dev)) 864 return NOTIFY_DONE; 865 866 switch (event) { 867 case NETDEV_UP: 868 if (ipvlan_add_addr6(ipvlan, &if6->addr)) 869 return NOTIFY_BAD; 870 break; 871 872 case NETDEV_DOWN: 873 ipvlan_del_addr6(ipvlan, &if6->addr); 874 break; 875 } 876 877 return NOTIFY_OK; 878 } 879 880 static int ipvlan_addr6_validator_event(struct notifier_block *unused, 881 unsigned long event, void *ptr) 882 { 883 struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr; 884 struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev; 885 struct ipvl_dev *ipvlan = netdev_priv(dev); 886 887 if (!ipvlan_is_valid_dev(dev)) 888 return NOTIFY_DONE; 889 890 switch (event) { 891 case NETDEV_UP: 892 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) { 893 NL_SET_ERR_MSG(i6vi->extack, 894 "Address already assigned to an ipvlan device"); 895 return notifier_from_errno(-EADDRINUSE); 896 } 897 break; 898 } 899 900 return NOTIFY_OK; 901 } 902 #endif 903 904 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 905 { 906 int ret = -EINVAL; 907 908 spin_lock_bh(&ipvlan->addrs_lock); 909 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false)) 910 netif_err(ipvlan, ifup, ipvlan->dev, 911 "Failed to add IPv4=%pI4 on %s intf.\n", 912 ip4_addr, ipvlan->dev->name); 913 else 914 ret = ipvlan_add_addr(ipvlan, ip4_addr, false); 915 spin_unlock_bh(&ipvlan->addrs_lock); 916 return ret; 917 } 918 919 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 920 { 921 return ipvlan_del_addr(ipvlan, ip4_addr, false); 922 } 923 924 static int ipvlan_addr4_event(struct notifier_block *unused, 925 unsigned long event, void *ptr) 926 { 927 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr; 928 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev; 929 struct ipvl_dev *ipvlan = netdev_priv(dev); 930 struct in_addr ip4_addr; 931 932 if (!ipvlan_is_valid_dev(dev)) 933 return NOTIFY_DONE; 934 935 switch (event) { 936 case NETDEV_UP: 937 ip4_addr.s_addr = if4->ifa_address; 938 if (ipvlan_add_addr4(ipvlan, &ip4_addr)) 939 return NOTIFY_BAD; 940 break; 941 942 case NETDEV_DOWN: 943 ip4_addr.s_addr = if4->ifa_address; 944 ipvlan_del_addr4(ipvlan, &ip4_addr); 945 break; 946 } 947 948 return NOTIFY_OK; 949 } 950 951 static int ipvlan_addr4_validator_event(struct notifier_block *unused, 952 unsigned long event, void *ptr) 953 { 954 struct in_validator_info *ivi = (struct in_validator_info *)ptr; 955 struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev; 956 struct ipvl_dev *ipvlan = netdev_priv(dev); 957 958 if (!ipvlan_is_valid_dev(dev)) 959 return NOTIFY_DONE; 960 961 switch (event) { 962 case NETDEV_UP: 963 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) { 964 NL_SET_ERR_MSG(ivi->extack, 965 "Address already assigned to an ipvlan device"); 966 return notifier_from_errno(-EADDRINUSE); 967 } 968 break; 969 } 970 971 return NOTIFY_OK; 972 } 973 974 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = { 975 .notifier_call = ipvlan_addr4_event, 976 }; 977 978 static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = { 979 .notifier_call = ipvlan_addr4_validator_event, 980 }; 981 982 static struct notifier_block ipvlan_notifier_block __read_mostly = { 983 .notifier_call = ipvlan_device_event, 984 }; 985 986 #if IS_ENABLED(CONFIG_IPV6) 987 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = { 988 .notifier_call = ipvlan_addr6_event, 989 }; 990 991 static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = { 992 .notifier_call = ipvlan_addr6_validator_event, 993 }; 994 #endif 995 996 static int __init ipvlan_init_module(void) 997 { 998 int err; 999 1000 ipvlan_init_secret(); 1001 register_netdevice_notifier(&ipvlan_notifier_block); 1002 #if IS_ENABLED(CONFIG_IPV6) 1003 register_inet6addr_notifier(&ipvlan_addr6_notifier_block); 1004 register_inet6addr_validator_notifier( 1005 &ipvlan_addr6_vtor_notifier_block); 1006 #endif 1007 register_inetaddr_notifier(&ipvlan_addr4_notifier_block); 1008 register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block); 1009 1010 err = ipvlan_l3s_init(); 1011 if (err < 0) 1012 goto error; 1013 1014 err = ipvlan_link_register(&ipvlan_link_ops); 1015 if (err < 0) { 1016 ipvlan_l3s_cleanup(); 1017 goto error; 1018 } 1019 1020 return 0; 1021 error: 1022 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block); 1023 unregister_inetaddr_validator_notifier( 1024 &ipvlan_addr4_vtor_notifier_block); 1025 #if IS_ENABLED(CONFIG_IPV6) 1026 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block); 1027 unregister_inet6addr_validator_notifier( 1028 &ipvlan_addr6_vtor_notifier_block); 1029 #endif 1030 unregister_netdevice_notifier(&ipvlan_notifier_block); 1031 return err; 1032 } 1033 1034 static void __exit ipvlan_cleanup_module(void) 1035 { 1036 rtnl_link_unregister(&ipvlan_link_ops); 1037 ipvlan_l3s_cleanup(); 1038 unregister_netdevice_notifier(&ipvlan_notifier_block); 1039 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block); 1040 unregister_inetaddr_validator_notifier( 1041 &ipvlan_addr4_vtor_notifier_block); 1042 #if IS_ENABLED(CONFIG_IPV6) 1043 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block); 1044 unregister_inet6addr_validator_notifier( 1045 &ipvlan_addr6_vtor_notifier_block); 1046 #endif 1047 } 1048 1049 module_init(ipvlan_init_module); 1050 module_exit(ipvlan_cleanup_module); 1051 1052 MODULE_LICENSE("GPL"); 1053 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>"); 1054 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs"); 1055 MODULE_ALIAS_RTNL_LINK("ipvlan"); 1056