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