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