1 /* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com> 2 * 3 * This program is free software; you can redistribute it and/or 4 * modify it under the terms of the GNU General Public License as 5 * published by the Free Software Foundation; either version 2 of 6 * the License, or (at your option) any later version. 7 * 8 */ 9 10 #include "ipvlan.h" 11 12 static unsigned int ipvlan_netid __read_mostly; 13 14 struct ipvlan_netns { 15 unsigned int ipvl_nf_hook_refcnt; 16 }; 17 18 static const struct nf_hook_ops ipvl_nfops[] = { 19 { 20 .hook = ipvlan_nf_input, 21 .pf = NFPROTO_IPV4, 22 .hooknum = NF_INET_LOCAL_IN, 23 .priority = INT_MAX, 24 }, 25 #if IS_ENABLED(CONFIG_IPV6) 26 { 27 .hook = ipvlan_nf_input, 28 .pf = NFPROTO_IPV6, 29 .hooknum = NF_INET_LOCAL_IN, 30 .priority = INT_MAX, 31 }, 32 #endif 33 }; 34 35 static const struct l3mdev_ops ipvl_l3mdev_ops = { 36 .l3mdev_l3_rcv = ipvlan_l3_rcv, 37 }; 38 39 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev) 40 { 41 ipvlan->dev->mtu = dev->mtu; 42 } 43 44 static int ipvlan_register_nf_hook(struct net *net) 45 { 46 struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid); 47 int err = 0; 48 49 if (!vnet->ipvl_nf_hook_refcnt) { 50 err = nf_register_net_hooks(net, ipvl_nfops, 51 ARRAY_SIZE(ipvl_nfops)); 52 if (!err) 53 vnet->ipvl_nf_hook_refcnt = 1; 54 } else { 55 vnet->ipvl_nf_hook_refcnt++; 56 } 57 58 return err; 59 } 60 61 static void ipvlan_unregister_nf_hook(struct net *net) 62 { 63 struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid); 64 65 if (WARN_ON(!vnet->ipvl_nf_hook_refcnt)) 66 return; 67 68 vnet->ipvl_nf_hook_refcnt--; 69 if (!vnet->ipvl_nf_hook_refcnt) 70 nf_unregister_net_hooks(net, ipvl_nfops, 71 ARRAY_SIZE(ipvl_nfops)); 72 } 73 74 static int ipvlan_set_port_mode(struct ipvl_port *port, u16 nval) 75 { 76 struct ipvl_dev *ipvlan; 77 struct net_device *mdev = port->dev; 78 int err = 0; 79 80 ASSERT_RTNL(); 81 if (port->mode != nval) { 82 if (nval == IPVLAN_MODE_L3S) { 83 /* New mode is L3S */ 84 err = ipvlan_register_nf_hook(read_pnet(&port->pnet)); 85 if (!err) { 86 mdev->l3mdev_ops = &ipvl_l3mdev_ops; 87 mdev->priv_flags |= IFF_L3MDEV_MASTER; 88 } else 89 return err; 90 } else if (port->mode == IPVLAN_MODE_L3S) { 91 /* Old mode was L3S */ 92 mdev->priv_flags &= ~IFF_L3MDEV_MASTER; 93 ipvlan_unregister_nf_hook(read_pnet(&port->pnet)); 94 mdev->l3mdev_ops = NULL; 95 } 96 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 97 if (nval == IPVLAN_MODE_L3 || nval == IPVLAN_MODE_L3S) 98 ipvlan->dev->flags |= IFF_NOARP; 99 else 100 ipvlan->dev->flags &= ~IFF_NOARP; 101 } 102 port->mode = nval; 103 } 104 return err; 105 } 106 107 static int ipvlan_port_create(struct net_device *dev) 108 { 109 struct ipvl_port *port; 110 int err, idx; 111 112 port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL); 113 if (!port) 114 return -ENOMEM; 115 116 write_pnet(&port->pnet, dev_net(dev)); 117 port->dev = dev; 118 port->mode = IPVLAN_MODE_L3; 119 INIT_LIST_HEAD(&port->ipvlans); 120 for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++) 121 INIT_HLIST_HEAD(&port->hlhead[idx]); 122 123 skb_queue_head_init(&port->backlog); 124 INIT_WORK(&port->wq, ipvlan_process_multicast); 125 ida_init(&port->ida); 126 port->dev_id_start = 1; 127 128 err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port); 129 if (err) 130 goto err; 131 132 return 0; 133 134 err: 135 kfree(port); 136 return err; 137 } 138 139 static void ipvlan_port_destroy(struct net_device *dev) 140 { 141 struct ipvl_port *port = ipvlan_port_get_rtnl(dev); 142 struct sk_buff *skb; 143 144 if (port->mode == IPVLAN_MODE_L3S) { 145 dev->priv_flags &= ~IFF_L3MDEV_MASTER; 146 ipvlan_unregister_nf_hook(dev_net(dev)); 147 dev->l3mdev_ops = NULL; 148 } 149 netdev_rx_handler_unregister(dev); 150 cancel_work_sync(&port->wq); 151 while ((skb = __skb_dequeue(&port->backlog)) != NULL) { 152 if (skb->dev) 153 dev_put(skb->dev); 154 kfree_skb(skb); 155 } 156 ida_destroy(&port->ida); 157 kfree(port); 158 } 159 160 #define IPVLAN_FEATURES \ 161 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 162 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_GSO_ROBUST | \ 163 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \ 164 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 165 166 #define IPVLAN_STATE_MASK \ 167 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 168 169 static int ipvlan_init(struct net_device *dev) 170 { 171 struct ipvl_dev *ipvlan = netdev_priv(dev); 172 struct net_device *phy_dev = ipvlan->phy_dev; 173 struct ipvl_port *port; 174 int err; 175 176 dev->state = (dev->state & ~IPVLAN_STATE_MASK) | 177 (phy_dev->state & IPVLAN_STATE_MASK); 178 dev->features = phy_dev->features & IPVLAN_FEATURES; 179 dev->features |= NETIF_F_LLTX | NETIF_F_VLAN_CHALLENGED; 180 dev->gso_max_size = phy_dev->gso_max_size; 181 dev->gso_max_segs = phy_dev->gso_max_segs; 182 dev->hard_header_len = phy_dev->hard_header_len; 183 184 netdev_lockdep_set_classes(dev); 185 186 ipvlan->pcpu_stats = netdev_alloc_pcpu_stats(struct ipvl_pcpu_stats); 187 if (!ipvlan->pcpu_stats) 188 return -ENOMEM; 189 190 if (!netif_is_ipvlan_port(phy_dev)) { 191 err = ipvlan_port_create(phy_dev); 192 if (err < 0) { 193 free_percpu(ipvlan->pcpu_stats); 194 return err; 195 } 196 } 197 port = ipvlan_port_get_rtnl(phy_dev); 198 port->count += 1; 199 return 0; 200 } 201 202 static void ipvlan_uninit(struct net_device *dev) 203 { 204 struct ipvl_dev *ipvlan = netdev_priv(dev); 205 struct net_device *phy_dev = ipvlan->phy_dev; 206 struct ipvl_port *port; 207 208 free_percpu(ipvlan->pcpu_stats); 209 210 port = ipvlan_port_get_rtnl(phy_dev); 211 port->count -= 1; 212 if (!port->count) 213 ipvlan_port_destroy(port->dev); 214 } 215 216 static int ipvlan_open(struct net_device *dev) 217 { 218 struct ipvl_dev *ipvlan = netdev_priv(dev); 219 struct net_device *phy_dev = ipvlan->phy_dev; 220 struct ipvl_addr *addr; 221 222 if (ipvlan->port->mode == IPVLAN_MODE_L3 || 223 ipvlan->port->mode == IPVLAN_MODE_L3S) 224 dev->flags |= IFF_NOARP; 225 else 226 dev->flags &= ~IFF_NOARP; 227 228 rcu_read_lock(); 229 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode) 230 ipvlan_ht_addr_add(ipvlan, addr); 231 rcu_read_unlock(); 232 233 return dev_uc_add(phy_dev, phy_dev->dev_addr); 234 } 235 236 static int ipvlan_stop(struct net_device *dev) 237 { 238 struct ipvl_dev *ipvlan = netdev_priv(dev); 239 struct net_device *phy_dev = ipvlan->phy_dev; 240 struct ipvl_addr *addr; 241 242 dev_uc_unsync(phy_dev, dev); 243 dev_mc_unsync(phy_dev, dev); 244 245 dev_uc_del(phy_dev, phy_dev->dev_addr); 246 247 rcu_read_lock(); 248 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode) 249 ipvlan_ht_addr_del(addr); 250 rcu_read_unlock(); 251 252 return 0; 253 } 254 255 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb, 256 struct net_device *dev) 257 { 258 const struct ipvl_dev *ipvlan = netdev_priv(dev); 259 int skblen = skb->len; 260 int ret; 261 262 ret = ipvlan_queue_xmit(skb, dev); 263 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 264 struct ipvl_pcpu_stats *pcptr; 265 266 pcptr = this_cpu_ptr(ipvlan->pcpu_stats); 267 268 u64_stats_update_begin(&pcptr->syncp); 269 pcptr->tx_pkts++; 270 pcptr->tx_bytes += skblen; 271 u64_stats_update_end(&pcptr->syncp); 272 } else { 273 this_cpu_inc(ipvlan->pcpu_stats->tx_drps); 274 } 275 return ret; 276 } 277 278 static netdev_features_t ipvlan_fix_features(struct net_device *dev, 279 netdev_features_t features) 280 { 281 struct ipvl_dev *ipvlan = netdev_priv(dev); 282 283 return features & (ipvlan->sfeatures | ~IPVLAN_FEATURES); 284 } 285 286 static void ipvlan_change_rx_flags(struct net_device *dev, int change) 287 { 288 struct ipvl_dev *ipvlan = netdev_priv(dev); 289 struct net_device *phy_dev = ipvlan->phy_dev; 290 291 if (change & IFF_ALLMULTI) 292 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1); 293 } 294 295 static void ipvlan_set_multicast_mac_filter(struct net_device *dev) 296 { 297 struct ipvl_dev *ipvlan = netdev_priv(dev); 298 299 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 300 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE); 301 } else { 302 struct netdev_hw_addr *ha; 303 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE); 304 305 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE); 306 netdev_for_each_mc_addr(ha, dev) 307 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters); 308 309 /* Turn-on broadcast bit irrespective of address family, 310 * since broadcast is deferred to a work-queue, hence no 311 * impact on fast-path processing. 312 */ 313 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters); 314 315 bitmap_copy(ipvlan->mac_filters, mc_filters, 316 IPVLAN_MAC_FILTER_SIZE); 317 } 318 dev_uc_sync(ipvlan->phy_dev, dev); 319 dev_mc_sync(ipvlan->phy_dev, dev); 320 } 321 322 static void ipvlan_get_stats64(struct net_device *dev, 323 struct rtnl_link_stats64 *s) 324 { 325 struct ipvl_dev *ipvlan = netdev_priv(dev); 326 327 if (ipvlan->pcpu_stats) { 328 struct ipvl_pcpu_stats *pcptr; 329 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes; 330 u32 rx_errs = 0, tx_drps = 0; 331 u32 strt; 332 int idx; 333 334 for_each_possible_cpu(idx) { 335 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx); 336 do { 337 strt= u64_stats_fetch_begin_irq(&pcptr->syncp); 338 rx_pkts = pcptr->rx_pkts; 339 rx_bytes = pcptr->rx_bytes; 340 rx_mcast = pcptr->rx_mcast; 341 tx_pkts = pcptr->tx_pkts; 342 tx_bytes = pcptr->tx_bytes; 343 } while (u64_stats_fetch_retry_irq(&pcptr->syncp, 344 strt)); 345 346 s->rx_packets += rx_pkts; 347 s->rx_bytes += rx_bytes; 348 s->multicast += rx_mcast; 349 s->tx_packets += tx_pkts; 350 s->tx_bytes += tx_bytes; 351 352 /* u32 values are updated without syncp protection. */ 353 rx_errs += pcptr->rx_errs; 354 tx_drps += pcptr->tx_drps; 355 } 356 s->rx_errors = rx_errs; 357 s->rx_dropped = rx_errs; 358 s->tx_dropped = tx_drps; 359 } 360 } 361 362 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid) 363 { 364 struct ipvl_dev *ipvlan = netdev_priv(dev); 365 struct net_device *phy_dev = ipvlan->phy_dev; 366 367 return vlan_vid_add(phy_dev, proto, vid); 368 } 369 370 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto, 371 u16 vid) 372 { 373 struct ipvl_dev *ipvlan = netdev_priv(dev); 374 struct net_device *phy_dev = ipvlan->phy_dev; 375 376 vlan_vid_del(phy_dev, proto, vid); 377 return 0; 378 } 379 380 static int ipvlan_get_iflink(const struct net_device *dev) 381 { 382 struct ipvl_dev *ipvlan = netdev_priv(dev); 383 384 return ipvlan->phy_dev->ifindex; 385 } 386 387 static const struct net_device_ops ipvlan_netdev_ops = { 388 .ndo_init = ipvlan_init, 389 .ndo_uninit = ipvlan_uninit, 390 .ndo_open = ipvlan_open, 391 .ndo_stop = ipvlan_stop, 392 .ndo_start_xmit = ipvlan_start_xmit, 393 .ndo_fix_features = ipvlan_fix_features, 394 .ndo_change_rx_flags = ipvlan_change_rx_flags, 395 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter, 396 .ndo_get_stats64 = ipvlan_get_stats64, 397 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid, 398 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid, 399 .ndo_get_iflink = ipvlan_get_iflink, 400 }; 401 402 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 403 unsigned short type, const void *daddr, 404 const void *saddr, unsigned len) 405 { 406 const struct ipvl_dev *ipvlan = netdev_priv(dev); 407 struct net_device *phy_dev = ipvlan->phy_dev; 408 409 /* TODO Probably use a different field than dev_addr so that the 410 * mac-address on the virtual device is portable and can be carried 411 * while the packets use the mac-addr on the physical device. 412 */ 413 return dev_hard_header(skb, phy_dev, type, daddr, 414 saddr ? : phy_dev->dev_addr, len); 415 } 416 417 static const struct header_ops ipvlan_header_ops = { 418 .create = ipvlan_hard_header, 419 .parse = eth_header_parse, 420 .cache = eth_header_cache, 421 .cache_update = eth_header_cache_update, 422 }; 423 424 static bool netif_is_ipvlan(const struct net_device *dev) 425 { 426 /* both ipvlan and ipvtap devices use the same netdev_ops */ 427 return dev->netdev_ops == &ipvlan_netdev_ops; 428 } 429 430 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev, 431 struct ethtool_link_ksettings *cmd) 432 { 433 const struct ipvl_dev *ipvlan = netdev_priv(dev); 434 435 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd); 436 } 437 438 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev, 439 struct ethtool_drvinfo *drvinfo) 440 { 441 strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver)); 442 strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version)); 443 } 444 445 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev) 446 { 447 const struct ipvl_dev *ipvlan = netdev_priv(dev); 448 449 return ipvlan->msg_enable; 450 } 451 452 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value) 453 { 454 struct ipvl_dev *ipvlan = netdev_priv(dev); 455 456 ipvlan->msg_enable = value; 457 } 458 459 static const struct ethtool_ops ipvlan_ethtool_ops = { 460 .get_link = ethtool_op_get_link, 461 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings, 462 .get_drvinfo = ipvlan_ethtool_get_drvinfo, 463 .get_msglevel = ipvlan_ethtool_get_msglevel, 464 .set_msglevel = ipvlan_ethtool_set_msglevel, 465 }; 466 467 static int ipvlan_nl_changelink(struct net_device *dev, 468 struct nlattr *tb[], struct nlattr *data[], 469 struct netlink_ext_ack *extack) 470 { 471 struct ipvl_dev *ipvlan = netdev_priv(dev); 472 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 473 int err = 0; 474 475 if (!data) 476 return 0; 477 478 if (data[IFLA_IPVLAN_MODE]) { 479 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 480 481 err = ipvlan_set_port_mode(port, nmode); 482 } 483 484 if (!err && data[IFLA_IPVLAN_FLAGS]) { 485 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]); 486 487 if (flags & IPVLAN_F_PRIVATE) 488 ipvlan_mark_private(port); 489 else 490 ipvlan_clear_private(port); 491 492 if (flags & IPVLAN_F_VEPA) 493 ipvlan_mark_vepa(port); 494 else 495 ipvlan_clear_vepa(port); 496 } 497 498 return err; 499 } 500 501 static size_t ipvlan_nl_getsize(const struct net_device *dev) 502 { 503 return (0 504 + nla_total_size(2) /* IFLA_IPVLAN_MODE */ 505 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */ 506 ); 507 } 508 509 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[], 510 struct netlink_ext_ack *extack) 511 { 512 if (!data) 513 return 0; 514 515 if (data[IFLA_IPVLAN_MODE]) { 516 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 517 518 if (mode < IPVLAN_MODE_L2 || mode >= IPVLAN_MODE_MAX) 519 return -EINVAL; 520 } 521 if (data[IFLA_IPVLAN_FLAGS]) { 522 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]); 523 524 /* Only two bits are used at this moment. */ 525 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) 526 return -EINVAL; 527 /* Also both flags can't be active at the same time. */ 528 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) == 529 (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) 530 return -EINVAL; 531 } 532 533 return 0; 534 } 535 536 static int ipvlan_nl_fillinfo(struct sk_buff *skb, 537 const struct net_device *dev) 538 { 539 struct ipvl_dev *ipvlan = netdev_priv(dev); 540 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 541 int ret = -EINVAL; 542 543 if (!port) 544 goto err; 545 546 ret = -EMSGSIZE; 547 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode)) 548 goto err; 549 if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags)) 550 goto err; 551 552 return 0; 553 554 err: 555 return ret; 556 } 557 558 int ipvlan_link_new(struct net *src_net, struct net_device *dev, 559 struct nlattr *tb[], struct nlattr *data[], 560 struct netlink_ext_ack *extack) 561 { 562 struct ipvl_dev *ipvlan = netdev_priv(dev); 563 struct ipvl_port *port; 564 struct net_device *phy_dev; 565 int err; 566 u16 mode = IPVLAN_MODE_L3; 567 568 if (!tb[IFLA_LINK]) 569 return -EINVAL; 570 571 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 572 if (!phy_dev) 573 return -ENODEV; 574 575 if (netif_is_ipvlan(phy_dev)) { 576 struct ipvl_dev *tmp = netdev_priv(phy_dev); 577 578 phy_dev = tmp->phy_dev; 579 } else if (!netif_is_ipvlan_port(phy_dev)) { 580 /* Exit early if the underlying link is invalid or busy */ 581 if (phy_dev->type != ARPHRD_ETHER || 582 phy_dev->flags & IFF_LOOPBACK) { 583 netdev_err(phy_dev, 584 "Master is either lo or non-ether device\n"); 585 return -EINVAL; 586 } 587 588 if (netdev_is_rx_handler_busy(phy_dev)) { 589 netdev_err(phy_dev, "Device is already in use.\n"); 590 return -EBUSY; 591 } 592 } 593 594 ipvlan->phy_dev = phy_dev; 595 ipvlan->dev = dev; 596 ipvlan->sfeatures = IPVLAN_FEATURES; 597 ipvlan_adjust_mtu(ipvlan, phy_dev); 598 INIT_LIST_HEAD(&ipvlan->addrs); 599 spin_lock_init(&ipvlan->addrs_lock); 600 601 /* TODO Probably put random address here to be presented to the 602 * world but keep using the physical-dev address for the outgoing 603 * packets. 604 */ 605 memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN); 606 607 dev->priv_flags |= IFF_NO_RX_HANDLER; 608 609 err = register_netdevice(dev); 610 if (err < 0) 611 return err; 612 613 /* ipvlan_init() would have created the port, if required */ 614 port = ipvlan_port_get_rtnl(phy_dev); 615 ipvlan->port = port; 616 617 /* If the port-id base is at the MAX value, then wrap it around and 618 * begin from 0x1 again. This may be due to a busy system where lots 619 * of slaves are getting created and deleted. 620 */ 621 if (port->dev_id_start == 0xFFFE) 622 port->dev_id_start = 0x1; 623 624 /* Since L2 address is shared among all IPvlan slaves including 625 * master, use unique 16 bit dev-ids to diffentiate among them. 626 * Assign IDs between 0x1 and 0xFFFE (used by the master) to each 627 * slave link [see addrconf_ifid_eui48()]. 628 */ 629 err = ida_simple_get(&port->ida, port->dev_id_start, 0xFFFE, 630 GFP_KERNEL); 631 if (err < 0) 632 err = ida_simple_get(&port->ida, 0x1, port->dev_id_start, 633 GFP_KERNEL); 634 if (err < 0) 635 goto unregister_netdev; 636 dev->dev_id = err; 637 638 /* Increment id-base to the next slot for the future assignment */ 639 port->dev_id_start = err + 1; 640 641 err = netdev_upper_dev_link(phy_dev, dev, extack); 642 if (err) 643 goto remove_ida; 644 645 /* Flags are per port and latest update overrides. User has 646 * to be consistent in setting it just like the mode attribute. 647 */ 648 if (data && data[IFLA_IPVLAN_FLAGS]) 649 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]); 650 651 if (data && data[IFLA_IPVLAN_MODE]) 652 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 653 654 err = ipvlan_set_port_mode(port, mode); 655 if (err) 656 goto unlink_netdev; 657 658 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans); 659 netif_stacked_transfer_operstate(phy_dev, dev); 660 return 0; 661 662 unlink_netdev: 663 netdev_upper_dev_unlink(phy_dev, dev); 664 remove_ida: 665 ida_simple_remove(&port->ida, dev->dev_id); 666 unregister_netdev: 667 unregister_netdevice(dev); 668 return err; 669 } 670 EXPORT_SYMBOL_GPL(ipvlan_link_new); 671 672 void ipvlan_link_delete(struct net_device *dev, struct list_head *head) 673 { 674 struct ipvl_dev *ipvlan = netdev_priv(dev); 675 struct ipvl_addr *addr, *next; 676 677 spin_lock_bh(&ipvlan->addrs_lock); 678 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) { 679 ipvlan_ht_addr_del(addr); 680 list_del_rcu(&addr->anode); 681 kfree_rcu(addr, rcu); 682 } 683 spin_unlock_bh(&ipvlan->addrs_lock); 684 685 ida_simple_remove(&ipvlan->port->ida, dev->dev_id); 686 list_del_rcu(&ipvlan->pnode); 687 unregister_netdevice_queue(dev, head); 688 netdev_upper_dev_unlink(ipvlan->phy_dev, dev); 689 } 690 EXPORT_SYMBOL_GPL(ipvlan_link_delete); 691 692 void ipvlan_link_setup(struct net_device *dev) 693 { 694 ether_setup(dev); 695 696 dev->max_mtu = ETH_MAX_MTU; 697 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 698 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE; 699 dev->netdev_ops = &ipvlan_netdev_ops; 700 dev->needs_free_netdev = true; 701 dev->header_ops = &ipvlan_header_ops; 702 dev->ethtool_ops = &ipvlan_ethtool_ops; 703 } 704 EXPORT_SYMBOL_GPL(ipvlan_link_setup); 705 706 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] = 707 { 708 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 }, 709 [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 }, 710 }; 711 712 static struct rtnl_link_ops ipvlan_link_ops = { 713 .kind = "ipvlan", 714 .priv_size = sizeof(struct ipvl_dev), 715 716 .setup = ipvlan_link_setup, 717 .newlink = ipvlan_link_new, 718 .dellink = ipvlan_link_delete, 719 }; 720 721 int ipvlan_link_register(struct rtnl_link_ops *ops) 722 { 723 ops->get_size = ipvlan_nl_getsize; 724 ops->policy = ipvlan_nl_policy; 725 ops->validate = ipvlan_nl_validate; 726 ops->fill_info = ipvlan_nl_fillinfo; 727 ops->changelink = ipvlan_nl_changelink; 728 ops->maxtype = IFLA_IPVLAN_MAX; 729 return rtnl_link_register(ops); 730 } 731 EXPORT_SYMBOL_GPL(ipvlan_link_register); 732 733 static int ipvlan_device_event(struct notifier_block *unused, 734 unsigned long event, void *ptr) 735 { 736 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 737 struct ipvl_dev *ipvlan, *next; 738 struct ipvl_port *port; 739 LIST_HEAD(lst_kill); 740 741 if (!netif_is_ipvlan_port(dev)) 742 return NOTIFY_DONE; 743 744 port = ipvlan_port_get_rtnl(dev); 745 746 switch (event) { 747 case NETDEV_CHANGE: 748 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 749 netif_stacked_transfer_operstate(ipvlan->phy_dev, 750 ipvlan->dev); 751 break; 752 753 case NETDEV_REGISTER: { 754 struct net *oldnet, *newnet = dev_net(dev); 755 struct ipvlan_netns *old_vnet; 756 757 oldnet = read_pnet(&port->pnet); 758 if (net_eq(newnet, oldnet)) 759 break; 760 761 write_pnet(&port->pnet, newnet); 762 763 old_vnet = net_generic(oldnet, ipvlan_netid); 764 if (!old_vnet->ipvl_nf_hook_refcnt) 765 break; 766 767 ipvlan_register_nf_hook(newnet); 768 ipvlan_unregister_nf_hook(oldnet); 769 break; 770 } 771 case NETDEV_UNREGISTER: 772 if (dev->reg_state != NETREG_UNREGISTERING) 773 break; 774 775 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode) 776 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev, 777 &lst_kill); 778 unregister_netdevice_many(&lst_kill); 779 break; 780 781 case NETDEV_FEAT_CHANGE: 782 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 783 ipvlan->dev->features = dev->features & IPVLAN_FEATURES; 784 ipvlan->dev->gso_max_size = dev->gso_max_size; 785 ipvlan->dev->gso_max_segs = dev->gso_max_segs; 786 netdev_features_change(ipvlan->dev); 787 } 788 break; 789 790 case NETDEV_CHANGEMTU: 791 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 792 ipvlan_adjust_mtu(ipvlan, dev); 793 break; 794 795 case NETDEV_CHANGEADDR: 796 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 797 ether_addr_copy(ipvlan->dev->dev_addr, dev->dev_addr); 798 call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev); 799 } 800 break; 801 802 case NETDEV_PRE_TYPE_CHANGE: 803 /* Forbid underlying device to change its type. */ 804 return NOTIFY_BAD; 805 } 806 return NOTIFY_DONE; 807 } 808 809 /* the caller must held the addrs lock */ 810 static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6) 811 { 812 struct ipvl_addr *addr; 813 814 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC); 815 if (!addr) 816 return -ENOMEM; 817 818 addr->master = ipvlan; 819 if (!is_v6) { 820 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr)); 821 addr->atype = IPVL_IPV4; 822 #if IS_ENABLED(CONFIG_IPV6) 823 } else { 824 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr)); 825 addr->atype = IPVL_IPV6; 826 #endif 827 } 828 829 list_add_tail_rcu(&addr->anode, &ipvlan->addrs); 830 831 /* If the interface is not up, the address will be added to the hash 832 * list by ipvlan_open. 833 */ 834 if (netif_running(ipvlan->dev)) 835 ipvlan_ht_addr_add(ipvlan, addr); 836 837 return 0; 838 } 839 840 static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6) 841 { 842 struct ipvl_addr *addr; 843 844 spin_lock_bh(&ipvlan->addrs_lock); 845 addr = ipvlan_find_addr(ipvlan, iaddr, is_v6); 846 if (!addr) { 847 spin_unlock_bh(&ipvlan->addrs_lock); 848 return; 849 } 850 851 ipvlan_ht_addr_del(addr); 852 list_del_rcu(&addr->anode); 853 spin_unlock_bh(&ipvlan->addrs_lock); 854 kfree_rcu(addr, rcu); 855 } 856 857 static bool ipvlan_is_valid_dev(const struct net_device *dev) 858 { 859 struct ipvl_dev *ipvlan = netdev_priv(dev); 860 861 if (!netif_is_ipvlan(dev)) 862 return false; 863 864 if (!ipvlan || !ipvlan->port) 865 return false; 866 867 return true; 868 } 869 870 #if IS_ENABLED(CONFIG_IPV6) 871 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 872 { 873 int ret = -EINVAL; 874 875 spin_lock_bh(&ipvlan->addrs_lock); 876 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true)) 877 netif_err(ipvlan, ifup, ipvlan->dev, 878 "Failed to add IPv6=%pI6c addr for %s intf\n", 879 ip6_addr, ipvlan->dev->name); 880 else 881 ret = ipvlan_add_addr(ipvlan, ip6_addr, true); 882 spin_unlock_bh(&ipvlan->addrs_lock); 883 return ret; 884 } 885 886 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 887 { 888 return ipvlan_del_addr(ipvlan, ip6_addr, true); 889 } 890 891 static int ipvlan_addr6_event(struct notifier_block *unused, 892 unsigned long event, void *ptr) 893 { 894 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr; 895 struct net_device *dev = (struct net_device *)if6->idev->dev; 896 struct ipvl_dev *ipvlan = netdev_priv(dev); 897 898 if (!ipvlan_is_valid_dev(dev)) 899 return NOTIFY_DONE; 900 901 switch (event) { 902 case NETDEV_UP: 903 if (ipvlan_add_addr6(ipvlan, &if6->addr)) 904 return NOTIFY_BAD; 905 break; 906 907 case NETDEV_DOWN: 908 ipvlan_del_addr6(ipvlan, &if6->addr); 909 break; 910 } 911 912 return NOTIFY_OK; 913 } 914 915 static int ipvlan_addr6_validator_event(struct notifier_block *unused, 916 unsigned long event, void *ptr) 917 { 918 struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr; 919 struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev; 920 struct ipvl_dev *ipvlan = netdev_priv(dev); 921 922 if (!ipvlan_is_valid_dev(dev)) 923 return NOTIFY_DONE; 924 925 switch (event) { 926 case NETDEV_UP: 927 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) { 928 NL_SET_ERR_MSG(i6vi->extack, 929 "Address already assigned to an ipvlan device"); 930 return notifier_from_errno(-EADDRINUSE); 931 } 932 break; 933 } 934 935 return NOTIFY_OK; 936 } 937 #endif 938 939 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 940 { 941 int ret = -EINVAL; 942 943 spin_lock_bh(&ipvlan->addrs_lock); 944 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false)) 945 netif_err(ipvlan, ifup, ipvlan->dev, 946 "Failed to add IPv4=%pI4 on %s intf.\n", 947 ip4_addr, ipvlan->dev->name); 948 else 949 ret = ipvlan_add_addr(ipvlan, ip4_addr, false); 950 spin_unlock_bh(&ipvlan->addrs_lock); 951 return ret; 952 } 953 954 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 955 { 956 return ipvlan_del_addr(ipvlan, ip4_addr, false); 957 } 958 959 static int ipvlan_addr4_event(struct notifier_block *unused, 960 unsigned long event, void *ptr) 961 { 962 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr; 963 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev; 964 struct ipvl_dev *ipvlan = netdev_priv(dev); 965 struct in_addr ip4_addr; 966 967 if (!ipvlan_is_valid_dev(dev)) 968 return NOTIFY_DONE; 969 970 switch (event) { 971 case NETDEV_UP: 972 ip4_addr.s_addr = if4->ifa_address; 973 if (ipvlan_add_addr4(ipvlan, &ip4_addr)) 974 return NOTIFY_BAD; 975 break; 976 977 case NETDEV_DOWN: 978 ip4_addr.s_addr = if4->ifa_address; 979 ipvlan_del_addr4(ipvlan, &ip4_addr); 980 break; 981 } 982 983 return NOTIFY_OK; 984 } 985 986 static int ipvlan_addr4_validator_event(struct notifier_block *unused, 987 unsigned long event, void *ptr) 988 { 989 struct in_validator_info *ivi = (struct in_validator_info *)ptr; 990 struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev; 991 struct ipvl_dev *ipvlan = netdev_priv(dev); 992 993 if (!ipvlan_is_valid_dev(dev)) 994 return NOTIFY_DONE; 995 996 switch (event) { 997 case NETDEV_UP: 998 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) { 999 NL_SET_ERR_MSG(ivi->extack, 1000 "Address already assigned to an ipvlan device"); 1001 return notifier_from_errno(-EADDRINUSE); 1002 } 1003 break; 1004 } 1005 1006 return NOTIFY_OK; 1007 } 1008 1009 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = { 1010 .notifier_call = ipvlan_addr4_event, 1011 }; 1012 1013 static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = { 1014 .notifier_call = ipvlan_addr4_validator_event, 1015 }; 1016 1017 static struct notifier_block ipvlan_notifier_block __read_mostly = { 1018 .notifier_call = ipvlan_device_event, 1019 }; 1020 1021 #if IS_ENABLED(CONFIG_IPV6) 1022 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = { 1023 .notifier_call = ipvlan_addr6_event, 1024 }; 1025 1026 static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = { 1027 .notifier_call = ipvlan_addr6_validator_event, 1028 }; 1029 #endif 1030 1031 static void ipvlan_ns_exit(struct net *net) 1032 { 1033 struct ipvlan_netns *vnet = net_generic(net, ipvlan_netid); 1034 1035 if (WARN_ON_ONCE(vnet->ipvl_nf_hook_refcnt)) { 1036 vnet->ipvl_nf_hook_refcnt = 0; 1037 nf_unregister_net_hooks(net, ipvl_nfops, 1038 ARRAY_SIZE(ipvl_nfops)); 1039 } 1040 } 1041 1042 static struct pernet_operations ipvlan_net_ops = { 1043 .id = &ipvlan_netid, 1044 .size = sizeof(struct ipvlan_netns), 1045 .exit = ipvlan_ns_exit, 1046 }; 1047 1048 static int __init ipvlan_init_module(void) 1049 { 1050 int err; 1051 1052 ipvlan_init_secret(); 1053 register_netdevice_notifier(&ipvlan_notifier_block); 1054 #if IS_ENABLED(CONFIG_IPV6) 1055 register_inet6addr_notifier(&ipvlan_addr6_notifier_block); 1056 register_inet6addr_validator_notifier( 1057 &ipvlan_addr6_vtor_notifier_block); 1058 #endif 1059 register_inetaddr_notifier(&ipvlan_addr4_notifier_block); 1060 register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block); 1061 1062 err = register_pernet_subsys(&ipvlan_net_ops); 1063 if (err < 0) 1064 goto error; 1065 1066 err = ipvlan_link_register(&ipvlan_link_ops); 1067 if (err < 0) { 1068 unregister_pernet_subsys(&ipvlan_net_ops); 1069 goto error; 1070 } 1071 1072 return 0; 1073 error: 1074 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block); 1075 unregister_inetaddr_validator_notifier( 1076 &ipvlan_addr4_vtor_notifier_block); 1077 #if IS_ENABLED(CONFIG_IPV6) 1078 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block); 1079 unregister_inet6addr_validator_notifier( 1080 &ipvlan_addr6_vtor_notifier_block); 1081 #endif 1082 unregister_netdevice_notifier(&ipvlan_notifier_block); 1083 return err; 1084 } 1085 1086 static void __exit ipvlan_cleanup_module(void) 1087 { 1088 rtnl_link_unregister(&ipvlan_link_ops); 1089 unregister_pernet_subsys(&ipvlan_net_ops); 1090 unregister_netdevice_notifier(&ipvlan_notifier_block); 1091 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block); 1092 unregister_inetaddr_validator_notifier( 1093 &ipvlan_addr4_vtor_notifier_block); 1094 #if IS_ENABLED(CONFIG_IPV6) 1095 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block); 1096 unregister_inet6addr_validator_notifier( 1097 &ipvlan_addr6_vtor_notifier_block); 1098 #endif 1099 } 1100 1101 module_init(ipvlan_init_module); 1102 module_exit(ipvlan_cleanup_module); 1103 1104 MODULE_LICENSE("GPL"); 1105 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>"); 1106 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs"); 1107 MODULE_ALIAS_RTNL_LINK("ipvlan"); 1108