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