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