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 7static 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 43fail: 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 59static 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 86err: 87 kfree(port); 88 return err; 89} 90 91static 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_ALWAYS_ON_OFLOADS \ 110 (NETIF_F_SG | NETIF_F_HW_CSUM | \ 111 NETIF_F_GSO_ROBUST | NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL) 112 113#define IPVLAN_ALWAYS_ON \ 114 (IPVLAN_ALWAYS_ON_OFLOADS | NETIF_F_LLTX | NETIF_F_VLAN_CHALLENGED) 115 116#define IPVLAN_FEATURES \ 117 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 118 NETIF_F_GSO | NETIF_F_ALL_TSO | NETIF_F_GSO_ROBUST | \ 119 NETIF_F_GRO | NETIF_F_RXCSUM | \ 120 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 121 122 /* NETIF_F_GSO_ENCAP_ALL NETIF_F_GSO_SOFTWARE Newly added */ 123 124#define IPVLAN_STATE_MASK \ 125 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 126 127static int ipvlan_init(struct net_device *dev) 128{ 129 struct ipvl_dev *ipvlan = netdev_priv(dev); 130 struct net_device *phy_dev = ipvlan->phy_dev; 131 struct ipvl_port *port; 132 int err; 133 134 dev->state = (dev->state & ~IPVLAN_STATE_MASK) | 135 (phy_dev->state & IPVLAN_STATE_MASK); 136 dev->features = phy_dev->features & IPVLAN_FEATURES; 137 dev->features |= IPVLAN_ALWAYS_ON; 138 dev->vlan_features = phy_dev->vlan_features & IPVLAN_FEATURES; 139 dev->vlan_features |= IPVLAN_ALWAYS_ON_OFLOADS; 140 dev->hw_enc_features |= dev->features; 141 dev->gso_max_size = phy_dev->gso_max_size; 142 dev->gso_max_segs = phy_dev->gso_max_segs; 143 dev->hard_header_len = phy_dev->hard_header_len; 144 145 netdev_lockdep_set_classes(dev); 146 147 ipvlan->pcpu_stats = netdev_alloc_pcpu_stats(struct ipvl_pcpu_stats); 148 if (!ipvlan->pcpu_stats) 149 return -ENOMEM; 150 151 if (!netif_is_ipvlan_port(phy_dev)) { 152 err = ipvlan_port_create(phy_dev); 153 if (err < 0) { 154 free_percpu(ipvlan->pcpu_stats); 155 return err; 156 } 157 } 158 port = ipvlan_port_get_rtnl(phy_dev); 159 port->count += 1; 160 return 0; 161} 162 163static void ipvlan_uninit(struct net_device *dev) 164{ 165 struct ipvl_dev *ipvlan = netdev_priv(dev); 166 struct net_device *phy_dev = ipvlan->phy_dev; 167 struct ipvl_port *port; 168 169 free_percpu(ipvlan->pcpu_stats); 170 171 port = ipvlan_port_get_rtnl(phy_dev); 172 port->count -= 1; 173 if (!port->count) 174 ipvlan_port_destroy(port->dev); 175} 176 177static int ipvlan_open(struct net_device *dev) 178{ 179 struct ipvl_dev *ipvlan = netdev_priv(dev); 180 struct ipvl_addr *addr; 181 182 if (ipvlan->port->mode == IPVLAN_MODE_L3 || 183 ipvlan->port->mode == IPVLAN_MODE_L3S) 184 dev->flags |= IFF_NOARP; 185 else 186 dev->flags &= ~IFF_NOARP; 187 188 rcu_read_lock(); 189 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode) 190 ipvlan_ht_addr_add(ipvlan, addr); 191 rcu_read_unlock(); 192 193 return 0; 194} 195 196static int ipvlan_stop(struct net_device *dev) 197{ 198 struct ipvl_dev *ipvlan = netdev_priv(dev); 199 struct net_device *phy_dev = ipvlan->phy_dev; 200 struct ipvl_addr *addr; 201 202 dev_uc_unsync(phy_dev, dev); 203 dev_mc_unsync(phy_dev, dev); 204 205 rcu_read_lock(); 206 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode) 207 ipvlan_ht_addr_del(addr); 208 rcu_read_unlock(); 209 210 return 0; 211} 212 213static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb, 214 struct net_device *dev) 215{ 216 const struct ipvl_dev *ipvlan = netdev_priv(dev); 217 int skblen = skb->len; 218 int ret; 219 220 ret = ipvlan_queue_xmit(skb, dev); 221 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 222 struct ipvl_pcpu_stats *pcptr; 223 224 pcptr = this_cpu_ptr(ipvlan->pcpu_stats); 225 226 u64_stats_update_begin(&pcptr->syncp); 227 pcptr->tx_pkts++; 228 pcptr->tx_bytes += skblen; 229 u64_stats_update_end(&pcptr->syncp); 230 } else { 231 this_cpu_inc(ipvlan->pcpu_stats->tx_drps); 232 } 233 return ret; 234} 235 236static netdev_features_t ipvlan_fix_features(struct net_device *dev, 237 netdev_features_t features) 238{ 239 struct ipvl_dev *ipvlan = netdev_priv(dev); 240 241 features |= NETIF_F_ALL_FOR_ALL; 242 features &= (ipvlan->sfeatures | ~IPVLAN_FEATURES); 243 features = netdev_increment_features(ipvlan->phy_dev->features, 244 features, features); 245 features |= IPVLAN_ALWAYS_ON; 246 features &= (IPVLAN_FEATURES | IPVLAN_ALWAYS_ON); 247 248 return features; 249} 250 251static void ipvlan_change_rx_flags(struct net_device *dev, int change) 252{ 253 struct ipvl_dev *ipvlan = netdev_priv(dev); 254 struct net_device *phy_dev = ipvlan->phy_dev; 255 256 if (change & IFF_ALLMULTI) 257 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1); 258} 259 260static void ipvlan_set_multicast_mac_filter(struct net_device *dev) 261{ 262 struct ipvl_dev *ipvlan = netdev_priv(dev); 263 264 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 265 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE); 266 } else { 267 struct netdev_hw_addr *ha; 268 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE); 269 270 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE); 271 netdev_for_each_mc_addr(ha, dev) 272 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters); 273 274 /* Turn-on broadcast bit irrespective of address family, 275 * since broadcast is deferred to a work-queue, hence no 276 * impact on fast-path processing. 277 */ 278 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters); 279 280 bitmap_copy(ipvlan->mac_filters, mc_filters, 281 IPVLAN_MAC_FILTER_SIZE); 282 } 283 dev_uc_sync(ipvlan->phy_dev, dev); 284 dev_mc_sync(ipvlan->phy_dev, dev); 285} 286 287static void ipvlan_get_stats64(struct net_device *dev, 288 struct rtnl_link_stats64 *s) 289{ 290 struct ipvl_dev *ipvlan = netdev_priv(dev); 291 292 if (ipvlan->pcpu_stats) { 293 struct ipvl_pcpu_stats *pcptr; 294 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes; 295 u32 rx_errs = 0, tx_drps = 0; 296 u32 strt; 297 int idx; 298 299 for_each_possible_cpu(idx) { 300 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx); 301 do { 302 strt= u64_stats_fetch_begin_irq(&pcptr->syncp); 303 rx_pkts = pcptr->rx_pkts; 304 rx_bytes = pcptr->rx_bytes; 305 rx_mcast = pcptr->rx_mcast; 306 tx_pkts = pcptr->tx_pkts; 307 tx_bytes = pcptr->tx_bytes; 308 } while (u64_stats_fetch_retry_irq(&pcptr->syncp, 309 strt)); 310 311 s->rx_packets += rx_pkts; 312 s->rx_bytes += rx_bytes; 313 s->multicast += rx_mcast; 314 s->tx_packets += tx_pkts; 315 s->tx_bytes += tx_bytes; 316 317 /* u32 values are updated without syncp protection. */ 318 rx_errs += pcptr->rx_errs; 319 tx_drps += pcptr->tx_drps; 320 } 321 s->rx_errors = rx_errs; 322 s->rx_dropped = rx_errs; 323 s->tx_dropped = tx_drps; 324 } 325 s->tx_errors = DEV_STATS_READ(dev, tx_errors); 326} 327 328static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid) 329{ 330 struct ipvl_dev *ipvlan = netdev_priv(dev); 331 struct net_device *phy_dev = ipvlan->phy_dev; 332 333 return vlan_vid_add(phy_dev, proto, vid); 334} 335 336static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto, 337 u16 vid) 338{ 339 struct ipvl_dev *ipvlan = netdev_priv(dev); 340 struct net_device *phy_dev = ipvlan->phy_dev; 341 342 vlan_vid_del(phy_dev, proto, vid); 343 return 0; 344} 345 346static int ipvlan_get_iflink(const struct net_device *dev) 347{ 348 struct ipvl_dev *ipvlan = netdev_priv(dev); 349 350 return ipvlan->phy_dev->ifindex; 351} 352 353static const struct net_device_ops ipvlan_netdev_ops = { 354 .ndo_init = ipvlan_init, 355 .ndo_uninit = ipvlan_uninit, 356 .ndo_open = ipvlan_open, 357 .ndo_stop = ipvlan_stop, 358 .ndo_start_xmit = ipvlan_start_xmit, 359 .ndo_fix_features = ipvlan_fix_features, 360 .ndo_change_rx_flags = ipvlan_change_rx_flags, 361 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter, 362 .ndo_get_stats64 = ipvlan_get_stats64, 363 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid, 364 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid, 365 .ndo_get_iflink = ipvlan_get_iflink, 366}; 367 368static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 369 unsigned short type, const void *daddr, 370 const void *saddr, unsigned len) 371{ 372 const struct ipvl_dev *ipvlan = netdev_priv(dev); 373 struct net_device *phy_dev = ipvlan->phy_dev; 374 375 /* TODO Probably use a different field than dev_addr so that the 376 * mac-address on the virtual device is portable and can be carried 377 * while the packets use the mac-addr on the physical device. 378 */ 379 return dev_hard_header(skb, phy_dev, type, daddr, 380 saddr ? : phy_dev->dev_addr, len); 381} 382 383static const struct header_ops ipvlan_header_ops = { 384 .create = ipvlan_hard_header, 385 .parse = eth_header_parse, 386 .cache = eth_header_cache, 387 .cache_update = eth_header_cache_update, 388}; 389 390static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev) 391{ 392 ipvlan->dev->mtu = dev->mtu; 393} 394 395static bool netif_is_ipvlan(const struct net_device *dev) 396{ 397 /* both ipvlan and ipvtap devices use the same netdev_ops */ 398 return dev->netdev_ops == &ipvlan_netdev_ops; 399} 400 401static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev, 402 struct ethtool_link_ksettings *cmd) 403{ 404 const struct ipvl_dev *ipvlan = netdev_priv(dev); 405 406 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd); 407} 408 409static void ipvlan_ethtool_get_drvinfo(struct net_device *dev, 410 struct ethtool_drvinfo *drvinfo) 411{ 412 strlcpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver)); 413 strlcpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version)); 414} 415 416static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev) 417{ 418 const struct ipvl_dev *ipvlan = netdev_priv(dev); 419 420 return ipvlan->msg_enable; 421} 422 423static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value) 424{ 425 struct ipvl_dev *ipvlan = netdev_priv(dev); 426 427 ipvlan->msg_enable = value; 428} 429 430static const struct ethtool_ops ipvlan_ethtool_ops = { 431 .get_link = ethtool_op_get_link, 432 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings, 433 .get_drvinfo = ipvlan_ethtool_get_drvinfo, 434 .get_msglevel = ipvlan_ethtool_get_msglevel, 435 .set_msglevel = ipvlan_ethtool_set_msglevel, 436}; 437 438static int ipvlan_nl_changelink(struct net_device *dev, 439 struct nlattr *tb[], struct nlattr *data[], 440 struct netlink_ext_ack *extack) 441{ 442 struct ipvl_dev *ipvlan = netdev_priv(dev); 443 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 444 int err = 0; 445 446 if (!data) 447 return 0; 448 if (!ns_capable(dev_net(ipvlan->phy_dev)->user_ns, CAP_NET_ADMIN)) 449 return -EPERM; 450 451 if (data[IFLA_IPVLAN_MODE]) { 452 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 453 454 err = ipvlan_set_port_mode(port, nmode, extack); 455 } 456 457 if (!err && data[IFLA_IPVLAN_FLAGS]) { 458 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]); 459 460 if (flags & IPVLAN_F_PRIVATE) 461 ipvlan_mark_private(port); 462 else 463 ipvlan_clear_private(port); 464 465 if (flags & IPVLAN_F_VEPA) 466 ipvlan_mark_vepa(port); 467 else 468 ipvlan_clear_vepa(port); 469 } 470 471 return err; 472} 473 474static size_t ipvlan_nl_getsize(const struct net_device *dev) 475{ 476 return (0 477 + nla_total_size(2) /* IFLA_IPVLAN_MODE */ 478 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */ 479 ); 480} 481 482static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[], 483 struct netlink_ext_ack *extack) 484{ 485 if (!data) 486 return 0; 487 488 if (data[IFLA_IPVLAN_MODE]) { 489 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 490 491 if (mode >= IPVLAN_MODE_MAX) 492 return -EINVAL; 493 } 494 if (data[IFLA_IPVLAN_FLAGS]) { 495 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]); 496 497 /* Only two bits are used at this moment. */ 498 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) 499 return -EINVAL; 500 /* Also both flags can't be active at the same time. */ 501 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) == 502 (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) 503 return -EINVAL; 504 } 505 506 return 0; 507} 508 509static int ipvlan_nl_fillinfo(struct sk_buff *skb, 510 const struct net_device *dev) 511{ 512 struct ipvl_dev *ipvlan = netdev_priv(dev); 513 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 514 int ret = -EINVAL; 515 516 if (!port) 517 goto err; 518 519 ret = -EMSGSIZE; 520 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode)) 521 goto err; 522 if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags)) 523 goto err; 524 525 return 0; 526 527err: 528 return ret; 529} 530 531int ipvlan_link_new(struct net *src_net, struct net_device *dev, 532 struct nlattr *tb[], struct nlattr *data[], 533 struct netlink_ext_ack *extack) 534{ 535 struct ipvl_dev *ipvlan = netdev_priv(dev); 536 struct ipvl_port *port; 537 struct net_device *phy_dev; 538 int err; 539 u16 mode = IPVLAN_MODE_L3; 540 541 if (!tb[IFLA_LINK]) 542 return -EINVAL; 543 544 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 545 if (!phy_dev) 546 return -ENODEV; 547 548 if (netif_is_ipvlan(phy_dev)) { 549 struct ipvl_dev *tmp = netdev_priv(phy_dev); 550 551 phy_dev = tmp->phy_dev; 552 if (!ns_capable(dev_net(phy_dev)->user_ns, CAP_NET_ADMIN)) 553 return -EPERM; 554 } else if (!netif_is_ipvlan_port(phy_dev)) { 555 /* Exit early if the underlying link is invalid or busy */ 556 if (phy_dev->type != ARPHRD_ETHER || 557 phy_dev->flags & IFF_LOOPBACK) { 558 netdev_err(phy_dev, 559 "Master is either lo or non-ether device\n"); 560 return -EINVAL; 561 } 562 563 if (netdev_is_rx_handler_busy(phy_dev)) { 564 netdev_err(phy_dev, "Device is already in use.\n"); 565 return -EBUSY; 566 } 567 } 568 569 ipvlan->phy_dev = phy_dev; 570 ipvlan->dev = dev; 571 ipvlan->sfeatures = IPVLAN_FEATURES; 572 if (!tb[IFLA_MTU]) 573 ipvlan_adjust_mtu(ipvlan, phy_dev); 574 INIT_LIST_HEAD(&ipvlan->addrs); 575 spin_lock_init(&ipvlan->addrs_lock); 576 577 /* TODO Probably put random address here to be presented to the 578 * world but keep using the physical-dev address for the outgoing 579 * packets. 580 */ 581 memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN); 582 583 dev->priv_flags |= IFF_NO_RX_HANDLER; 584 585 err = register_netdevice(dev); 586 if (err < 0) 587 return err; 588 589 /* ipvlan_init() would have created the port, if required */ 590 port = ipvlan_port_get_rtnl(phy_dev); 591 ipvlan->port = port; 592 593 /* If the port-id base is at the MAX value, then wrap it around and 594 * begin from 0x1 again. This may be due to a busy system where lots 595 * of slaves are getting created and deleted. 596 */ 597 if (port->dev_id_start == 0xFFFE) 598 port->dev_id_start = 0x1; 599 600 /* Since L2 address is shared among all IPvlan slaves including 601 * master, use unique 16 bit dev-ids to diffentiate among them. 602 * Assign IDs between 0x1 and 0xFFFE (used by the master) to each 603 * slave link [see addrconf_ifid_eui48()]. 604 */ 605 err = ida_simple_get(&port->ida, port->dev_id_start, 0xFFFE, 606 GFP_KERNEL); 607 if (err < 0) 608 err = ida_simple_get(&port->ida, 0x1, port->dev_id_start, 609 GFP_KERNEL); 610 if (err < 0) 611 goto unregister_netdev; 612 dev->dev_id = err; 613 614 /* Increment id-base to the next slot for the future assignment */ 615 port->dev_id_start = err + 1; 616 617 err = netdev_upper_dev_link(phy_dev, dev, extack); 618 if (err) 619 goto remove_ida; 620 621 /* Flags are per port and latest update overrides. User has 622 * to be consistent in setting it just like the mode attribute. 623 */ 624 if (data && data[IFLA_IPVLAN_FLAGS]) 625 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]); 626 627 if (data && data[IFLA_IPVLAN_MODE]) 628 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 629 630 err = ipvlan_set_port_mode(port, mode, extack); 631 if (err) 632 goto unlink_netdev; 633 634 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans); 635 netif_stacked_transfer_operstate(phy_dev, dev); 636 return 0; 637 638unlink_netdev: 639 netdev_upper_dev_unlink(phy_dev, dev); 640remove_ida: 641 ida_simple_remove(&port->ida, dev->dev_id); 642unregister_netdev: 643 unregister_netdevice(dev); 644 return err; 645} 646EXPORT_SYMBOL_GPL(ipvlan_link_new); 647 648void ipvlan_link_delete(struct net_device *dev, struct list_head *head) 649{ 650 struct ipvl_dev *ipvlan = netdev_priv(dev); 651 struct ipvl_addr *addr, *next; 652 653 spin_lock_bh(&ipvlan->addrs_lock); 654 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) { 655 ipvlan_ht_addr_del(addr); 656 list_del_rcu(&addr->anode); 657 kfree_rcu(addr, rcu); 658 } 659 spin_unlock_bh(&ipvlan->addrs_lock); 660 661 ida_simple_remove(&ipvlan->port->ida, dev->dev_id); 662 list_del_rcu(&ipvlan->pnode); 663 unregister_netdevice_queue(dev, head); 664 netdev_upper_dev_unlink(ipvlan->phy_dev, dev); 665} 666EXPORT_SYMBOL_GPL(ipvlan_link_delete); 667 668void ipvlan_link_setup(struct net_device *dev) 669{ 670 ether_setup(dev); 671 672 dev->max_mtu = ETH_MAX_MTU; 673 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 674 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE; 675 dev->netdev_ops = &ipvlan_netdev_ops; 676 dev->needs_free_netdev = true; 677 dev->header_ops = &ipvlan_header_ops; 678 dev->ethtool_ops = &ipvlan_ethtool_ops; 679} 680EXPORT_SYMBOL_GPL(ipvlan_link_setup); 681 682static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] = 683{ 684 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 }, 685 [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 }, 686}; 687 688static struct net *ipvlan_get_link_net(const struct net_device *dev) 689{ 690 struct ipvl_dev *ipvlan = netdev_priv(dev); 691 692 return dev_net(ipvlan->phy_dev); 693} 694 695static struct rtnl_link_ops ipvlan_link_ops = { 696 .kind = "ipvlan", 697 .priv_size = sizeof(struct ipvl_dev), 698 699 .setup = ipvlan_link_setup, 700 .newlink = ipvlan_link_new, 701 .dellink = ipvlan_link_delete, 702 .get_link_net = ipvlan_get_link_net, 703}; 704 705int ipvlan_link_register(struct rtnl_link_ops *ops) 706{ 707 ops->get_size = ipvlan_nl_getsize; 708 ops->policy = ipvlan_nl_policy; 709 ops->validate = ipvlan_nl_validate; 710 ops->fill_info = ipvlan_nl_fillinfo; 711 ops->changelink = ipvlan_nl_changelink; 712 ops->maxtype = IFLA_IPVLAN_MAX; 713 return rtnl_link_register(ops); 714} 715EXPORT_SYMBOL_GPL(ipvlan_link_register); 716 717static int ipvlan_device_event(struct notifier_block *unused, 718 unsigned long event, void *ptr) 719{ 720 struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr); 721 struct netdev_notifier_pre_changeaddr_info *prechaddr_info; 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 int err; 727 728 if (!netif_is_ipvlan_port(dev)) 729 return NOTIFY_DONE; 730 731 port = ipvlan_port_get_rtnl(dev); 732 733 switch (event) { 734 case NETDEV_CHANGE: 735 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 736 netif_stacked_transfer_operstate(ipvlan->phy_dev, 737 ipvlan->dev); 738 break; 739 740 case NETDEV_REGISTER: { 741 struct net *oldnet, *newnet = dev_net(dev); 742 743 oldnet = read_pnet(&port->pnet); 744 if (net_eq(newnet, oldnet)) 745 break; 746 747 write_pnet(&port->pnet, newnet); 748 749 if (port->mode == IPVLAN_MODE_L3S) 750 ipvlan_migrate_l3s_hook(oldnet, newnet); 751 break; 752 } 753 case NETDEV_UNREGISTER: 754 if (dev->reg_state != NETREG_UNREGISTERING) 755 break; 756 757 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode) 758 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev, 759 &lst_kill); 760 unregister_netdevice_many(&lst_kill); 761 break; 762 763 case NETDEV_FEAT_CHANGE: 764 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 765 ipvlan->dev->gso_max_size = dev->gso_max_size; 766 ipvlan->dev->gso_max_segs = dev->gso_max_segs; 767 netdev_update_features(ipvlan->dev); 768 } 769 break; 770 771 case NETDEV_CHANGEMTU: 772 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 773 ipvlan_adjust_mtu(ipvlan, dev); 774 break; 775 776 case NETDEV_PRE_CHANGEADDR: 777 prechaddr_info = ptr; 778 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 779 err = dev_pre_changeaddr_notify(ipvlan->dev, 780 prechaddr_info->dev_addr, 781 extack); 782 if (err) 783 return notifier_from_errno(err); 784 } 785 break; 786 787 case NETDEV_CHANGEADDR: 788 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 789 ether_addr_copy(ipvlan->dev->dev_addr, dev->dev_addr); 790 call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev); 791 } 792 break; 793 794 case NETDEV_PRE_TYPE_CHANGE: 795 /* Forbid underlying device to change its type. */ 796 return NOTIFY_BAD; 797 } 798 return NOTIFY_DONE; 799} 800 801/* the caller must held the addrs lock */ 802static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6) 803{ 804 struct ipvl_addr *addr; 805 806 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC); 807 if (!addr) 808 return -ENOMEM; 809 810 addr->master = ipvlan; 811 if (!is_v6) { 812 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr)); 813 addr->atype = IPVL_IPV4; 814#if IS_ENABLED(CONFIG_IPV6) 815 } else { 816 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr)); 817 addr->atype = IPVL_IPV6; 818#endif 819 } 820 821 list_add_tail_rcu(&addr->anode, &ipvlan->addrs); 822 823 /* If the interface is not up, the address will be added to the hash 824 * list by ipvlan_open. 825 */ 826 if (netif_running(ipvlan->dev)) 827 ipvlan_ht_addr_add(ipvlan, addr); 828 829 return 0; 830} 831 832static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6) 833{ 834 struct ipvl_addr *addr; 835 836 spin_lock_bh(&ipvlan->addrs_lock); 837 addr = ipvlan_find_addr(ipvlan, iaddr, is_v6); 838 if (!addr) { 839 spin_unlock_bh(&ipvlan->addrs_lock); 840 return; 841 } 842 843 ipvlan_ht_addr_del(addr); 844 list_del_rcu(&addr->anode); 845 spin_unlock_bh(&ipvlan->addrs_lock); 846 kfree_rcu(addr, rcu); 847} 848 849static bool ipvlan_is_valid_dev(const struct net_device *dev) 850{ 851 struct ipvl_dev *ipvlan = netdev_priv(dev); 852 853 if (!netif_is_ipvlan(dev)) 854 return false; 855 856 if (!ipvlan || !ipvlan->port) 857 return false; 858 859 return true; 860} 861 862#if IS_ENABLED(CONFIG_IPV6) 863static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 864{ 865 int ret = -EINVAL; 866 867 spin_lock_bh(&ipvlan->addrs_lock); 868 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true)) 869 netif_err(ipvlan, ifup, ipvlan->dev, 870 "Failed to add IPv6=%pI6c addr for %s intf\n", 871 ip6_addr, ipvlan->dev->name); 872 else 873 ret = ipvlan_add_addr(ipvlan, ip6_addr, true); 874 spin_unlock_bh(&ipvlan->addrs_lock); 875 return ret; 876} 877 878static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 879{ 880 return ipvlan_del_addr(ipvlan, ip6_addr, true); 881} 882 883static int ipvlan_addr6_event(struct notifier_block *unused, 884 unsigned long event, void *ptr) 885{ 886 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr; 887 struct net_device *dev = (struct net_device *)if6->idev->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_add_addr6(ipvlan, &if6->addr)) 896 return NOTIFY_BAD; 897 break; 898 899 case NETDEV_DOWN: 900 ipvlan_del_addr6(ipvlan, &if6->addr); 901 break; 902 } 903 904 return NOTIFY_OK; 905} 906 907static int ipvlan_addr6_validator_event(struct notifier_block *unused, 908 unsigned long event, void *ptr) 909{ 910 struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr; 911 struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev; 912 struct ipvl_dev *ipvlan = netdev_priv(dev); 913 914 if (!ipvlan_is_valid_dev(dev)) 915 return NOTIFY_DONE; 916 917 switch (event) { 918 case NETDEV_UP: 919 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) { 920 NL_SET_ERR_MSG(i6vi->extack, 921 "Address already assigned to an ipvlan device"); 922 return notifier_from_errno(-EADDRINUSE); 923 } 924 break; 925 } 926 927 return NOTIFY_OK; 928} 929#endif 930 931static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 932{ 933 int ret = -EINVAL; 934 935 spin_lock_bh(&ipvlan->addrs_lock); 936 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false)) 937 netif_err(ipvlan, ifup, ipvlan->dev, 938 "Failed to add IPv4=%pI4 on %s intf.\n", 939 ip4_addr, ipvlan->dev->name); 940 else 941 ret = ipvlan_add_addr(ipvlan, ip4_addr, false); 942 spin_unlock_bh(&ipvlan->addrs_lock); 943 return ret; 944} 945 946static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 947{ 948 return ipvlan_del_addr(ipvlan, ip4_addr, false); 949} 950 951static int ipvlan_addr4_event(struct notifier_block *unused, 952 unsigned long event, void *ptr) 953{ 954 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr; 955 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev; 956 struct ipvl_dev *ipvlan = netdev_priv(dev); 957 struct in_addr ip4_addr; 958 959 if (!ipvlan_is_valid_dev(dev)) 960 return NOTIFY_DONE; 961 962 switch (event) { 963 case NETDEV_UP: 964 ip4_addr.s_addr = if4->ifa_address; 965 if (ipvlan_add_addr4(ipvlan, &ip4_addr)) 966 return NOTIFY_BAD; 967 break; 968 969 case NETDEV_DOWN: 970 ip4_addr.s_addr = if4->ifa_address; 971 ipvlan_del_addr4(ipvlan, &ip4_addr); 972 break; 973 } 974 975 return NOTIFY_OK; 976} 977 978static int ipvlan_addr4_validator_event(struct notifier_block *unused, 979 unsigned long event, void *ptr) 980{ 981 struct in_validator_info *ivi = (struct in_validator_info *)ptr; 982 struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev; 983 struct ipvl_dev *ipvlan = netdev_priv(dev); 984 985 if (!ipvlan_is_valid_dev(dev)) 986 return NOTIFY_DONE; 987 988 switch (event) { 989 case NETDEV_UP: 990 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) { 991 NL_SET_ERR_MSG(ivi->extack, 992 "Address already assigned to an ipvlan device"); 993 return notifier_from_errno(-EADDRINUSE); 994 } 995 break; 996 } 997 998 return NOTIFY_OK; 999} 1000 1001static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = { 1002 .notifier_call = ipvlan_addr4_event, 1003}; 1004 1005static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = { 1006 .notifier_call = ipvlan_addr4_validator_event, 1007}; 1008 1009static struct notifier_block ipvlan_notifier_block __read_mostly = { 1010 .notifier_call = ipvlan_device_event, 1011}; 1012 1013#if IS_ENABLED(CONFIG_IPV6) 1014static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = { 1015 .notifier_call = ipvlan_addr6_event, 1016}; 1017 1018static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = { 1019 .notifier_call = ipvlan_addr6_validator_event, 1020}; 1021#endif 1022 1023static int __init ipvlan_init_module(void) 1024{ 1025 int err; 1026 1027 ipvlan_init_secret(); 1028 register_netdevice_notifier(&ipvlan_notifier_block); 1029#if IS_ENABLED(CONFIG_IPV6) 1030 register_inet6addr_notifier(&ipvlan_addr6_notifier_block); 1031 register_inet6addr_validator_notifier( 1032 &ipvlan_addr6_vtor_notifier_block); 1033#endif 1034 register_inetaddr_notifier(&ipvlan_addr4_notifier_block); 1035 register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block); 1036 1037 err = ipvlan_l3s_init(); 1038 if (err < 0) 1039 goto error; 1040 1041 err = ipvlan_link_register(&ipvlan_link_ops); 1042 if (err < 0) { 1043 ipvlan_l3s_cleanup(); 1044 goto error; 1045 } 1046 1047 return 0; 1048error: 1049 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block); 1050 unregister_inetaddr_validator_notifier( 1051 &ipvlan_addr4_vtor_notifier_block); 1052#if IS_ENABLED(CONFIG_IPV6) 1053 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block); 1054 unregister_inet6addr_validator_notifier( 1055 &ipvlan_addr6_vtor_notifier_block); 1056#endif 1057 unregister_netdevice_notifier(&ipvlan_notifier_block); 1058 return err; 1059} 1060 1061static void __exit ipvlan_cleanup_module(void) 1062{ 1063 rtnl_link_unregister(&ipvlan_link_ops); 1064 ipvlan_l3s_cleanup(); 1065 unregister_netdevice_notifier(&ipvlan_notifier_block); 1066 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block); 1067 unregister_inetaddr_validator_notifier( 1068 &ipvlan_addr4_vtor_notifier_block); 1069#if IS_ENABLED(CONFIG_IPV6) 1070 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block); 1071 unregister_inet6addr_validator_notifier( 1072 &ipvlan_addr6_vtor_notifier_block); 1073#endif 1074} 1075 1076module_init(ipvlan_init_module); 1077module_exit(ipvlan_cleanup_module); 1078 1079MODULE_LICENSE("GPL"); 1080MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>"); 1081MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs"); 1082MODULE_ALIAS_RTNL_LINK("ipvlan"); 1083