1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* Copyright (c) 2014 Mahesh Bandewar <maheshb@google.com> 3 */ 4 5 #include <linux/ethtool.h> 6 7 #include "ipvlan.h" 8 9 static int ipvlan_set_port_mode(struct ipvl_port *port, u16 nval, 10 struct netlink_ext_ack *extack) 11 { 12 struct ipvl_dev *ipvlan; 13 unsigned int flags; 14 int err; 15 16 ASSERT_RTNL(); 17 if (port->mode != nval) { 18 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 19 flags = ipvlan->dev->flags; 20 if (nval == IPVLAN_MODE_L3 || nval == IPVLAN_MODE_L3S) { 21 err = dev_change_flags(ipvlan->dev, 22 flags | IFF_NOARP, 23 extack); 24 } else { 25 err = dev_change_flags(ipvlan->dev, 26 flags & ~IFF_NOARP, 27 extack); 28 } 29 if (unlikely(err)) 30 goto fail; 31 } 32 if (nval == IPVLAN_MODE_L3S) { 33 /* New mode is L3S */ 34 err = ipvlan_l3s_register(port); 35 if (err) 36 goto fail; 37 } else if (port->mode == IPVLAN_MODE_L3S) { 38 /* Old mode was L3S */ 39 ipvlan_l3s_unregister(port); 40 } 41 port->mode = nval; 42 } 43 return 0; 44 45 fail: 46 /* Undo the flags changes that have been done so far. */ 47 list_for_each_entry_continue_reverse(ipvlan, &port->ipvlans, pnode) { 48 flags = ipvlan->dev->flags; 49 if (port->mode == IPVLAN_MODE_L3 || 50 port->mode == IPVLAN_MODE_L3S) 51 dev_change_flags(ipvlan->dev, flags | IFF_NOARP, 52 NULL); 53 else 54 dev_change_flags(ipvlan->dev, flags & ~IFF_NOARP, 55 NULL); 56 } 57 58 return err; 59 } 60 61 static int ipvlan_port_create(struct net_device *dev) 62 { 63 struct ipvl_port *port; 64 int err, idx; 65 66 port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL); 67 if (!port) 68 return -ENOMEM; 69 70 write_pnet(&port->pnet, dev_net(dev)); 71 port->dev = dev; 72 port->mode = IPVLAN_MODE_L3; 73 INIT_LIST_HEAD(&port->ipvlans); 74 for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++) 75 INIT_HLIST_HEAD(&port->hlhead[idx]); 76 77 skb_queue_head_init(&port->backlog); 78 INIT_WORK(&port->wq, ipvlan_process_multicast); 79 ida_init(&port->ida); 80 port->dev_id_start = 1; 81 82 err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port); 83 if (err) 84 goto err; 85 86 netdev_hold(dev, &port->dev_tracker, GFP_KERNEL); 87 return 0; 88 89 err: 90 kfree(port); 91 return err; 92 } 93 94 static void ipvlan_port_destroy(struct net_device *dev) 95 { 96 struct ipvl_port *port = ipvlan_port_get_rtnl(dev); 97 struct sk_buff *skb; 98 99 netdev_put(dev, &port->dev_tracker); 100 if (port->mode == IPVLAN_MODE_L3S) 101 ipvlan_l3s_unregister(port); 102 netdev_rx_handler_unregister(dev); 103 cancel_work_sync(&port->wq); 104 while ((skb = __skb_dequeue(&port->backlog)) != NULL) { 105 dev_put(skb->dev); 106 kfree_skb(skb); 107 } 108 ida_destroy(&port->ida); 109 kfree(port); 110 } 111 112 #define IPVLAN_ALWAYS_ON_OFLOADS \ 113 (NETIF_F_SG | NETIF_F_HW_CSUM | \ 114 NETIF_F_GSO_ROBUST | NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL) 115 116 #define IPVLAN_ALWAYS_ON \ 117 (IPVLAN_ALWAYS_ON_OFLOADS | NETIF_F_LLTX | NETIF_F_VLAN_CHALLENGED) 118 119 #define IPVLAN_FEATURES \ 120 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 121 NETIF_F_GSO | NETIF_F_ALL_TSO | NETIF_F_GSO_ROBUST | \ 122 NETIF_F_GRO | NETIF_F_RXCSUM | \ 123 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 124 125 /* NETIF_F_GSO_ENCAP_ALL NETIF_F_GSO_SOFTWARE Newly added */ 126 127 #define IPVLAN_STATE_MASK \ 128 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 129 130 static int ipvlan_init(struct net_device *dev) 131 { 132 struct ipvl_dev *ipvlan = netdev_priv(dev); 133 struct net_device *phy_dev = ipvlan->phy_dev; 134 struct ipvl_port *port; 135 int err; 136 137 dev->state = (dev->state & ~IPVLAN_STATE_MASK) | 138 (phy_dev->state & IPVLAN_STATE_MASK); 139 dev->features = phy_dev->features & IPVLAN_FEATURES; 140 dev->features |= IPVLAN_ALWAYS_ON; 141 dev->vlan_features = phy_dev->vlan_features & IPVLAN_FEATURES; 142 dev->vlan_features |= IPVLAN_ALWAYS_ON_OFLOADS; 143 dev->hw_enc_features |= dev->features; 144 netif_inherit_tso_max(dev, phy_dev); 145 dev->hard_header_len = phy_dev->hard_header_len; 146 147 netdev_lockdep_set_classes(dev); 148 149 ipvlan->pcpu_stats = netdev_alloc_pcpu_stats(struct ipvl_pcpu_stats); 150 if (!ipvlan->pcpu_stats) 151 return -ENOMEM; 152 153 if (!netif_is_ipvlan_port(phy_dev)) { 154 err = ipvlan_port_create(phy_dev); 155 if (err < 0) { 156 free_percpu(ipvlan->pcpu_stats); 157 return err; 158 } 159 } 160 port = ipvlan_port_get_rtnl(phy_dev); 161 port->count += 1; 162 return 0; 163 } 164 165 static void ipvlan_uninit(struct net_device *dev) 166 { 167 struct ipvl_dev *ipvlan = netdev_priv(dev); 168 struct net_device *phy_dev = ipvlan->phy_dev; 169 struct ipvl_port *port; 170 171 free_percpu(ipvlan->pcpu_stats); 172 173 port = ipvlan_port_get_rtnl(phy_dev); 174 port->count -= 1; 175 if (!port->count) 176 ipvlan_port_destroy(port->dev); 177 } 178 179 static int ipvlan_open(struct net_device *dev) 180 { 181 struct ipvl_dev *ipvlan = netdev_priv(dev); 182 struct ipvl_addr *addr; 183 184 if (ipvlan->port->mode == IPVLAN_MODE_L3 || 185 ipvlan->port->mode == IPVLAN_MODE_L3S) 186 dev->flags |= IFF_NOARP; 187 else 188 dev->flags &= ~IFF_NOARP; 189 190 rcu_read_lock(); 191 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode) 192 ipvlan_ht_addr_add(ipvlan, addr); 193 rcu_read_unlock(); 194 195 return 0; 196 } 197 198 static int ipvlan_stop(struct net_device *dev) 199 { 200 struct ipvl_dev *ipvlan = netdev_priv(dev); 201 struct net_device *phy_dev = ipvlan->phy_dev; 202 struct ipvl_addr *addr; 203 204 dev_uc_unsync(phy_dev, dev); 205 dev_mc_unsync(phy_dev, dev); 206 207 rcu_read_lock(); 208 list_for_each_entry_rcu(addr, &ipvlan->addrs, anode) 209 ipvlan_ht_addr_del(addr); 210 rcu_read_unlock(); 211 212 return 0; 213 } 214 215 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb, 216 struct net_device *dev) 217 { 218 const struct ipvl_dev *ipvlan = netdev_priv(dev); 219 int skblen = skb->len; 220 int ret; 221 222 ret = ipvlan_queue_xmit(skb, dev); 223 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 224 struct ipvl_pcpu_stats *pcptr; 225 226 pcptr = this_cpu_ptr(ipvlan->pcpu_stats); 227 228 u64_stats_update_begin(&pcptr->syncp); 229 u64_stats_inc(&pcptr->tx_pkts); 230 u64_stats_add(&pcptr->tx_bytes, skblen); 231 u64_stats_update_end(&pcptr->syncp); 232 } else { 233 this_cpu_inc(ipvlan->pcpu_stats->tx_drps); 234 } 235 return ret; 236 } 237 238 static netdev_features_t ipvlan_fix_features(struct net_device *dev, 239 netdev_features_t features) 240 { 241 struct ipvl_dev *ipvlan = netdev_priv(dev); 242 243 features |= NETIF_F_ALL_FOR_ALL; 244 features &= (ipvlan->sfeatures | ~IPVLAN_FEATURES); 245 features = netdev_increment_features(ipvlan->phy_dev->features, 246 features, features); 247 features |= IPVLAN_ALWAYS_ON; 248 features &= (IPVLAN_FEATURES | IPVLAN_ALWAYS_ON); 249 250 return features; 251 } 252 253 static void ipvlan_change_rx_flags(struct net_device *dev, int change) 254 { 255 struct ipvl_dev *ipvlan = netdev_priv(dev); 256 struct net_device *phy_dev = ipvlan->phy_dev; 257 258 if (change & IFF_ALLMULTI) 259 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1); 260 } 261 262 static void ipvlan_set_multicast_mac_filter(struct net_device *dev) 263 { 264 struct ipvl_dev *ipvlan = netdev_priv(dev); 265 266 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 267 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE); 268 } else { 269 struct netdev_hw_addr *ha; 270 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE); 271 272 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE); 273 netdev_for_each_mc_addr(ha, dev) 274 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters); 275 276 /* Turn-on broadcast bit irrespective of address family, 277 * since broadcast is deferred to a work-queue, hence no 278 * impact on fast-path processing. 279 */ 280 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters); 281 282 bitmap_copy(ipvlan->mac_filters, mc_filters, 283 IPVLAN_MAC_FILTER_SIZE); 284 } 285 dev_uc_sync(ipvlan->phy_dev, dev); 286 dev_mc_sync(ipvlan->phy_dev, dev); 287 } 288 289 static void ipvlan_get_stats64(struct net_device *dev, 290 struct rtnl_link_stats64 *s) 291 { 292 struct ipvl_dev *ipvlan = netdev_priv(dev); 293 294 if (ipvlan->pcpu_stats) { 295 struct ipvl_pcpu_stats *pcptr; 296 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes; 297 u32 rx_errs = 0, tx_drps = 0; 298 u32 strt; 299 int idx; 300 301 for_each_possible_cpu(idx) { 302 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx); 303 do { 304 strt = u64_stats_fetch_begin(&pcptr->syncp); 305 rx_pkts = u64_stats_read(&pcptr->rx_pkts); 306 rx_bytes = u64_stats_read(&pcptr->rx_bytes); 307 rx_mcast = u64_stats_read(&pcptr->rx_mcast); 308 tx_pkts = u64_stats_read(&pcptr->tx_pkts); 309 tx_bytes = u64_stats_read(&pcptr->tx_bytes); 310 } while (u64_stats_fetch_retry(&pcptr->syncp, 311 strt)); 312 313 s->rx_packets += rx_pkts; 314 s->rx_bytes += rx_bytes; 315 s->multicast += rx_mcast; 316 s->tx_packets += tx_pkts; 317 s->tx_bytes += tx_bytes; 318 319 /* u32 values are updated without syncp protection. */ 320 rx_errs += READ_ONCE(pcptr->rx_errs); 321 tx_drps += READ_ONCE(pcptr->tx_drps); 322 } 323 s->rx_errors = rx_errs; 324 s->rx_dropped = rx_errs; 325 s->tx_dropped = tx_drps; 326 } 327 s->tx_errors = DEV_STATS_READ(dev, tx_errors); 328 } 329 330 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid) 331 { 332 struct ipvl_dev *ipvlan = netdev_priv(dev); 333 struct net_device *phy_dev = ipvlan->phy_dev; 334 335 return vlan_vid_add(phy_dev, proto, vid); 336 } 337 338 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto, 339 u16 vid) 340 { 341 struct ipvl_dev *ipvlan = netdev_priv(dev); 342 struct net_device *phy_dev = ipvlan->phy_dev; 343 344 vlan_vid_del(phy_dev, proto, vid); 345 return 0; 346 } 347 348 static int ipvlan_get_iflink(const struct net_device *dev) 349 { 350 struct ipvl_dev *ipvlan = netdev_priv(dev); 351 352 return READ_ONCE(ipvlan->phy_dev->ifindex); 353 } 354 355 static const struct net_device_ops ipvlan_netdev_ops = { 356 .ndo_init = ipvlan_init, 357 .ndo_uninit = ipvlan_uninit, 358 .ndo_open = ipvlan_open, 359 .ndo_stop = ipvlan_stop, 360 .ndo_start_xmit = ipvlan_start_xmit, 361 .ndo_fix_features = ipvlan_fix_features, 362 .ndo_change_rx_flags = ipvlan_change_rx_flags, 363 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter, 364 .ndo_get_stats64 = ipvlan_get_stats64, 365 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid, 366 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid, 367 .ndo_get_iflink = ipvlan_get_iflink, 368 }; 369 370 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 371 unsigned short type, const void *daddr, 372 const void *saddr, unsigned len) 373 { 374 const struct ipvl_dev *ipvlan = netdev_priv(dev); 375 struct net_device *phy_dev = ipvlan->phy_dev; 376 377 /* TODO Probably use a different field than dev_addr so that the 378 * mac-address on the virtual device is portable and can be carried 379 * while the packets use the mac-addr on the physical device. 380 */ 381 return dev_hard_header(skb, phy_dev, type, daddr, 382 saddr ? : phy_dev->dev_addr, len); 383 } 384 385 static const struct header_ops ipvlan_header_ops = { 386 .create = ipvlan_hard_header, 387 .parse = eth_header_parse, 388 .cache = eth_header_cache, 389 .cache_update = eth_header_cache_update, 390 .parse_protocol = eth_header_parse_protocol, 391 }; 392 393 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev) 394 { 395 ipvlan->dev->mtu = dev->mtu; 396 } 397 398 static bool netif_is_ipvlan(const struct net_device *dev) 399 { 400 /* both ipvlan and ipvtap devices use the same netdev_ops */ 401 return dev->netdev_ops == &ipvlan_netdev_ops; 402 } 403 404 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev, 405 struct ethtool_link_ksettings *cmd) 406 { 407 const struct ipvl_dev *ipvlan = netdev_priv(dev); 408 409 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd); 410 } 411 412 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev, 413 struct ethtool_drvinfo *drvinfo) 414 { 415 strscpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver)); 416 strscpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version)); 417 } 418 419 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev) 420 { 421 const struct ipvl_dev *ipvlan = netdev_priv(dev); 422 423 return ipvlan->msg_enable; 424 } 425 426 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value) 427 { 428 struct ipvl_dev *ipvlan = netdev_priv(dev); 429 430 ipvlan->msg_enable = value; 431 } 432 433 static const struct ethtool_ops ipvlan_ethtool_ops = { 434 .get_link = ethtool_op_get_link, 435 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings, 436 .get_drvinfo = ipvlan_ethtool_get_drvinfo, 437 .get_msglevel = ipvlan_ethtool_get_msglevel, 438 .set_msglevel = ipvlan_ethtool_set_msglevel, 439 }; 440 441 static int ipvlan_nl_changelink(struct net_device *dev, 442 struct nlattr *tb[], struct nlattr *data[], 443 struct netlink_ext_ack *extack) 444 { 445 struct ipvl_dev *ipvlan = netdev_priv(dev); 446 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 447 int err = 0; 448 449 if (!data) 450 return 0; 451 if (!ns_capable(dev_net(ipvlan->phy_dev)->user_ns, CAP_NET_ADMIN)) 452 return -EPERM; 453 454 if (data[IFLA_IPVLAN_MODE]) { 455 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 456 457 err = ipvlan_set_port_mode(port, nmode, extack); 458 } 459 460 if (!err && data[IFLA_IPVLAN_FLAGS]) { 461 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]); 462 463 if (flags & IPVLAN_F_PRIVATE) 464 ipvlan_mark_private(port); 465 else 466 ipvlan_clear_private(port); 467 468 if (flags & IPVLAN_F_VEPA) 469 ipvlan_mark_vepa(port); 470 else 471 ipvlan_clear_vepa(port); 472 } 473 474 return err; 475 } 476 477 static size_t ipvlan_nl_getsize(const struct net_device *dev) 478 { 479 return (0 480 + nla_total_size(2) /* IFLA_IPVLAN_MODE */ 481 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */ 482 ); 483 } 484 485 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[], 486 struct netlink_ext_ack *extack) 487 { 488 if (!data) 489 return 0; 490 491 if (data[IFLA_IPVLAN_MODE]) { 492 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 493 494 if (mode >= IPVLAN_MODE_MAX) 495 return -EINVAL; 496 } 497 if (data[IFLA_IPVLAN_FLAGS]) { 498 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]); 499 500 /* Only two bits are used at this moment. */ 501 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) 502 return -EINVAL; 503 /* Also both flags can't be active at the same time. */ 504 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) == 505 (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) 506 return -EINVAL; 507 } 508 509 return 0; 510 } 511 512 static int ipvlan_nl_fillinfo(struct sk_buff *skb, 513 const struct net_device *dev) 514 { 515 struct ipvl_dev *ipvlan = netdev_priv(dev); 516 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 517 int ret = -EINVAL; 518 519 if (!port) 520 goto err; 521 522 ret = -EMSGSIZE; 523 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode)) 524 goto err; 525 if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags)) 526 goto err; 527 528 return 0; 529 530 err: 531 return ret; 532 } 533 534 int ipvlan_link_new(struct net *src_net, struct net_device *dev, 535 struct nlattr *tb[], struct nlattr *data[], 536 struct netlink_ext_ack *extack) 537 { 538 struct ipvl_dev *ipvlan = netdev_priv(dev); 539 struct ipvl_port *port; 540 struct net_device *phy_dev; 541 int err; 542 u16 mode = IPVLAN_MODE_L3; 543 544 if (!tb[IFLA_LINK]) 545 return -EINVAL; 546 547 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 548 if (!phy_dev) 549 return -ENODEV; 550 551 if (netif_is_ipvlan(phy_dev)) { 552 struct ipvl_dev *tmp = netdev_priv(phy_dev); 553 554 phy_dev = tmp->phy_dev; 555 if (!ns_capable(dev_net(phy_dev)->user_ns, CAP_NET_ADMIN)) 556 return -EPERM; 557 } else if (!netif_is_ipvlan_port(phy_dev)) { 558 /* Exit early if the underlying link is invalid or busy */ 559 if (phy_dev->type != ARPHRD_ETHER || 560 phy_dev->flags & IFF_LOOPBACK) { 561 netdev_err(phy_dev, 562 "Master is either lo or non-ether device\n"); 563 return -EINVAL; 564 } 565 566 if (netdev_is_rx_handler_busy(phy_dev)) { 567 netdev_err(phy_dev, "Device is already in use.\n"); 568 return -EBUSY; 569 } 570 } 571 572 ipvlan->phy_dev = phy_dev; 573 ipvlan->dev = dev; 574 ipvlan->sfeatures = IPVLAN_FEATURES; 575 if (!tb[IFLA_MTU]) 576 ipvlan_adjust_mtu(ipvlan, phy_dev); 577 INIT_LIST_HEAD(&ipvlan->addrs); 578 spin_lock_init(&ipvlan->addrs_lock); 579 580 /* TODO Probably put random address here to be presented to the 581 * world but keep using the physical-dev address for the outgoing 582 * packets. 583 */ 584 eth_hw_addr_set(dev, phy_dev->dev_addr); 585 586 dev->priv_flags |= IFF_NO_RX_HANDLER; 587 588 err = register_netdevice(dev); 589 if (err < 0) 590 return err; 591 592 /* ipvlan_init() would have created the port, if required */ 593 port = ipvlan_port_get_rtnl(phy_dev); 594 ipvlan->port = port; 595 596 /* If the port-id base is at the MAX value, then wrap it around and 597 * begin from 0x1 again. This may be due to a busy system where lots 598 * of slaves are getting created and deleted. 599 */ 600 if (port->dev_id_start == 0xFFFE) 601 port->dev_id_start = 0x1; 602 603 /* Since L2 address is shared among all IPvlan slaves including 604 * master, use unique 16 bit dev-ids to differentiate among them. 605 * Assign IDs between 0x1 and 0xFFFE (used by the master) to each 606 * slave link [see addrconf_ifid_eui48()]. 607 */ 608 err = ida_alloc_range(&port->ida, port->dev_id_start, 0xFFFD, 609 GFP_KERNEL); 610 if (err < 0) 611 err = ida_alloc_range(&port->ida, 0x1, port->dev_id_start - 1, 612 GFP_KERNEL); 613 if (err < 0) 614 goto unregister_netdev; 615 dev->dev_id = err; 616 617 /* Increment id-base to the next slot for the future assignment */ 618 port->dev_id_start = err + 1; 619 620 err = netdev_upper_dev_link(phy_dev, dev, extack); 621 if (err) 622 goto remove_ida; 623 624 /* Flags are per port and latest update overrides. User has 625 * to be consistent in setting it just like the mode attribute. 626 */ 627 if (data && data[IFLA_IPVLAN_FLAGS]) 628 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]); 629 630 if (data && data[IFLA_IPVLAN_MODE]) 631 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 632 633 err = ipvlan_set_port_mode(port, mode, extack); 634 if (err) 635 goto unlink_netdev; 636 637 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans); 638 netif_stacked_transfer_operstate(phy_dev, dev); 639 return 0; 640 641 unlink_netdev: 642 netdev_upper_dev_unlink(phy_dev, dev); 643 remove_ida: 644 ida_free(&port->ida, dev->dev_id); 645 unregister_netdev: 646 unregister_netdevice(dev); 647 return err; 648 } 649 EXPORT_SYMBOL_GPL(ipvlan_link_new); 650 651 void ipvlan_link_delete(struct net_device *dev, struct list_head *head) 652 { 653 struct ipvl_dev *ipvlan = netdev_priv(dev); 654 struct ipvl_addr *addr, *next; 655 656 spin_lock_bh(&ipvlan->addrs_lock); 657 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) { 658 ipvlan_ht_addr_del(addr); 659 list_del_rcu(&addr->anode); 660 kfree_rcu(addr, rcu); 661 } 662 spin_unlock_bh(&ipvlan->addrs_lock); 663 664 ida_free(&ipvlan->port->ida, dev->dev_id); 665 list_del_rcu(&ipvlan->pnode); 666 unregister_netdevice_queue(dev, head); 667 netdev_upper_dev_unlink(ipvlan->phy_dev, dev); 668 } 669 EXPORT_SYMBOL_GPL(ipvlan_link_delete); 670 671 void ipvlan_link_setup(struct net_device *dev) 672 { 673 ether_setup(dev); 674 675 dev->max_mtu = ETH_MAX_MTU; 676 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 677 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE; 678 dev->netdev_ops = &ipvlan_netdev_ops; 679 dev->needs_free_netdev = true; 680 dev->header_ops = &ipvlan_header_ops; 681 dev->ethtool_ops = &ipvlan_ethtool_ops; 682 } 683 EXPORT_SYMBOL_GPL(ipvlan_link_setup); 684 685 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] = 686 { 687 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 }, 688 [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 }, 689 }; 690 691 static struct net *ipvlan_get_link_net(const struct net_device *dev) 692 { 693 struct ipvl_dev *ipvlan = netdev_priv(dev); 694 695 return dev_net(ipvlan->phy_dev); 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 .get_link_net = ipvlan_get_link_net, 706 }; 707 708 int ipvlan_link_register(struct rtnl_link_ops *ops) 709 { 710 ops->get_size = ipvlan_nl_getsize; 711 ops->policy = ipvlan_nl_policy; 712 ops->validate = ipvlan_nl_validate; 713 ops->fill_info = ipvlan_nl_fillinfo; 714 ops->changelink = ipvlan_nl_changelink; 715 ops->maxtype = IFLA_IPVLAN_MAX; 716 return rtnl_link_register(ops); 717 } 718 EXPORT_SYMBOL_GPL(ipvlan_link_register); 719 720 static int ipvlan_device_event(struct notifier_block *unused, 721 unsigned long event, void *ptr) 722 { 723 struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr); 724 struct netdev_notifier_pre_changeaddr_info *prechaddr_info; 725 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 726 struct ipvl_dev *ipvlan, *next; 727 struct ipvl_port *port; 728 LIST_HEAD(lst_kill); 729 int err; 730 731 if (!netif_is_ipvlan_port(dev)) 732 return NOTIFY_DONE; 733 734 port = ipvlan_port_get_rtnl(dev); 735 736 switch (event) { 737 case NETDEV_UP: 738 case NETDEV_DOWN: 739 case NETDEV_CHANGE: 740 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 741 netif_stacked_transfer_operstate(ipvlan->phy_dev, 742 ipvlan->dev); 743 break; 744 745 case NETDEV_REGISTER: { 746 struct net *oldnet, *newnet = dev_net(dev); 747 748 oldnet = read_pnet(&port->pnet); 749 if (net_eq(newnet, oldnet)) 750 break; 751 752 write_pnet(&port->pnet, newnet); 753 754 if (port->mode == IPVLAN_MODE_L3S) 755 ipvlan_migrate_l3s_hook(oldnet, newnet); 756 break; 757 } 758 case NETDEV_UNREGISTER: 759 if (dev->reg_state != NETREG_UNREGISTERING) 760 break; 761 762 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, 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 netif_inherit_tso_max(ipvlan->dev, dev); 771 netdev_update_features(ipvlan->dev); 772 } 773 break; 774 775 case NETDEV_CHANGEMTU: 776 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 777 ipvlan_adjust_mtu(ipvlan, dev); 778 break; 779 780 case NETDEV_PRE_CHANGEADDR: 781 prechaddr_info = ptr; 782 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 783 err = dev_pre_changeaddr_notify(ipvlan->dev, 784 prechaddr_info->dev_addr, 785 extack); 786 if (err) 787 return notifier_from_errno(err); 788 } 789 break; 790 791 case NETDEV_CHANGEADDR: 792 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 793 eth_hw_addr_set(ipvlan->dev, dev->dev_addr); 794 call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev); 795 } 796 break; 797 798 case NETDEV_PRE_TYPE_CHANGE: 799 /* Forbid underlying device to change its type. */ 800 return NOTIFY_BAD; 801 } 802 return NOTIFY_DONE; 803 } 804 805 /* the caller must held the addrs lock */ 806 static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6) 807 { 808 struct ipvl_addr *addr; 809 810 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC); 811 if (!addr) 812 return -ENOMEM; 813 814 addr->master = ipvlan; 815 if (!is_v6) { 816 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr)); 817 addr->atype = IPVL_IPV4; 818 #if IS_ENABLED(CONFIG_IPV6) 819 } else { 820 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr)); 821 addr->atype = IPVL_IPV6; 822 #endif 823 } 824 825 list_add_tail_rcu(&addr->anode, &ipvlan->addrs); 826 827 /* If the interface is not up, the address will be added to the hash 828 * list by ipvlan_open. 829 */ 830 if (netif_running(ipvlan->dev)) 831 ipvlan_ht_addr_add(ipvlan, addr); 832 833 return 0; 834 } 835 836 static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6) 837 { 838 struct ipvl_addr *addr; 839 840 spin_lock_bh(&ipvlan->addrs_lock); 841 addr = ipvlan_find_addr(ipvlan, iaddr, is_v6); 842 if (!addr) { 843 spin_unlock_bh(&ipvlan->addrs_lock); 844 return; 845 } 846 847 ipvlan_ht_addr_del(addr); 848 list_del_rcu(&addr->anode); 849 spin_unlock_bh(&ipvlan->addrs_lock); 850 kfree_rcu(addr, rcu); 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 #if IS_ENABLED(CONFIG_IPV6) 867 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 868 { 869 int ret = -EINVAL; 870 871 spin_lock_bh(&ipvlan->addrs_lock); 872 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true)) 873 netif_err(ipvlan, ifup, ipvlan->dev, 874 "Failed to add IPv6=%pI6c addr for %s intf\n", 875 ip6_addr, ipvlan->dev->name); 876 else 877 ret = ipvlan_add_addr(ipvlan, ip6_addr, true); 878 spin_unlock_bh(&ipvlan->addrs_lock); 879 return ret; 880 } 881 882 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 883 { 884 return ipvlan_del_addr(ipvlan, ip6_addr, true); 885 } 886 887 static int ipvlan_addr6_event(struct notifier_block *unused, 888 unsigned long event, void *ptr) 889 { 890 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr; 891 struct net_device *dev = (struct net_device *)if6->idev->dev; 892 struct ipvl_dev *ipvlan = netdev_priv(dev); 893 894 if (!ipvlan_is_valid_dev(dev)) 895 return NOTIFY_DONE; 896 897 switch (event) { 898 case NETDEV_UP: 899 if (ipvlan_add_addr6(ipvlan, &if6->addr)) 900 return NOTIFY_BAD; 901 break; 902 903 case NETDEV_DOWN: 904 ipvlan_del_addr6(ipvlan, &if6->addr); 905 break; 906 } 907 908 return NOTIFY_OK; 909 } 910 911 static int ipvlan_addr6_validator_event(struct notifier_block *unused, 912 unsigned long event, void *ptr) 913 { 914 struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr; 915 struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev; 916 struct ipvl_dev *ipvlan = netdev_priv(dev); 917 918 if (!ipvlan_is_valid_dev(dev)) 919 return NOTIFY_DONE; 920 921 switch (event) { 922 case NETDEV_UP: 923 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) { 924 NL_SET_ERR_MSG(i6vi->extack, 925 "Address already assigned to an ipvlan device"); 926 return notifier_from_errno(-EADDRINUSE); 927 } 928 break; 929 } 930 931 return NOTIFY_OK; 932 } 933 #endif 934 935 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 936 { 937 int ret = -EINVAL; 938 939 spin_lock_bh(&ipvlan->addrs_lock); 940 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false)) 941 netif_err(ipvlan, ifup, ipvlan->dev, 942 "Failed to add IPv4=%pI4 on %s intf.\n", 943 ip4_addr, ipvlan->dev->name); 944 else 945 ret = ipvlan_add_addr(ipvlan, ip4_addr, false); 946 spin_unlock_bh(&ipvlan->addrs_lock); 947 return ret; 948 } 949 950 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 951 { 952 return ipvlan_del_addr(ipvlan, ip4_addr, false); 953 } 954 955 static int ipvlan_addr4_event(struct notifier_block *unused, 956 unsigned long event, void *ptr) 957 { 958 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr; 959 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev; 960 struct ipvl_dev *ipvlan = netdev_priv(dev); 961 struct in_addr ip4_addr; 962 963 if (!ipvlan_is_valid_dev(dev)) 964 return NOTIFY_DONE; 965 966 switch (event) { 967 case NETDEV_UP: 968 ip4_addr.s_addr = if4->ifa_address; 969 if (ipvlan_add_addr4(ipvlan, &ip4_addr)) 970 return NOTIFY_BAD; 971 break; 972 973 case NETDEV_DOWN: 974 ip4_addr.s_addr = if4->ifa_address; 975 ipvlan_del_addr4(ipvlan, &ip4_addr); 976 break; 977 } 978 979 return NOTIFY_OK; 980 } 981 982 static int ipvlan_addr4_validator_event(struct notifier_block *unused, 983 unsigned long event, void *ptr) 984 { 985 struct in_validator_info *ivi = (struct in_validator_info *)ptr; 986 struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev; 987 struct ipvl_dev *ipvlan = netdev_priv(dev); 988 989 if (!ipvlan_is_valid_dev(dev)) 990 return NOTIFY_DONE; 991 992 switch (event) { 993 case NETDEV_UP: 994 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) { 995 NL_SET_ERR_MSG(ivi->extack, 996 "Address already assigned to an ipvlan device"); 997 return notifier_from_errno(-EADDRINUSE); 998 } 999 break; 1000 } 1001 1002 return NOTIFY_OK; 1003 } 1004 1005 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = { 1006 .notifier_call = ipvlan_addr4_event, 1007 }; 1008 1009 static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = { 1010 .notifier_call = ipvlan_addr4_validator_event, 1011 }; 1012 1013 static struct notifier_block ipvlan_notifier_block __read_mostly = { 1014 .notifier_call = ipvlan_device_event, 1015 }; 1016 1017 #if IS_ENABLED(CONFIG_IPV6) 1018 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = { 1019 .notifier_call = ipvlan_addr6_event, 1020 }; 1021 1022 static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = { 1023 .notifier_call = ipvlan_addr6_validator_event, 1024 }; 1025 #endif 1026 1027 static int __init ipvlan_init_module(void) 1028 { 1029 int err; 1030 1031 ipvlan_init_secret(); 1032 register_netdevice_notifier(&ipvlan_notifier_block); 1033 #if IS_ENABLED(CONFIG_IPV6) 1034 register_inet6addr_notifier(&ipvlan_addr6_notifier_block); 1035 register_inet6addr_validator_notifier( 1036 &ipvlan_addr6_vtor_notifier_block); 1037 #endif 1038 register_inetaddr_notifier(&ipvlan_addr4_notifier_block); 1039 register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block); 1040 1041 err = ipvlan_l3s_init(); 1042 if (err < 0) 1043 goto error; 1044 1045 err = ipvlan_link_register(&ipvlan_link_ops); 1046 if (err < 0) { 1047 ipvlan_l3s_cleanup(); 1048 goto error; 1049 } 1050 1051 return 0; 1052 error: 1053 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block); 1054 unregister_inetaddr_validator_notifier( 1055 &ipvlan_addr4_vtor_notifier_block); 1056 #if IS_ENABLED(CONFIG_IPV6) 1057 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block); 1058 unregister_inet6addr_validator_notifier( 1059 &ipvlan_addr6_vtor_notifier_block); 1060 #endif 1061 unregister_netdevice_notifier(&ipvlan_notifier_block); 1062 return err; 1063 } 1064 1065 static void __exit ipvlan_cleanup_module(void) 1066 { 1067 rtnl_link_unregister(&ipvlan_link_ops); 1068 ipvlan_l3s_cleanup(); 1069 unregister_netdevice_notifier(&ipvlan_notifier_block); 1070 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block); 1071 unregister_inetaddr_validator_notifier( 1072 &ipvlan_addr4_vtor_notifier_block); 1073 #if IS_ENABLED(CONFIG_IPV6) 1074 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block); 1075 unregister_inet6addr_validator_notifier( 1076 &ipvlan_addr6_vtor_notifier_block); 1077 #endif 1078 } 1079 1080 module_init(ipvlan_init_module); 1081 module_exit(ipvlan_cleanup_module); 1082 1083 MODULE_LICENSE("GPL"); 1084 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>"); 1085 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs"); 1086 MODULE_ALIAS_RTNL_LINK("ipvlan"); 1087