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 } 328 329 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid) 330 { 331 struct ipvl_dev *ipvlan = netdev_priv(dev); 332 struct net_device *phy_dev = ipvlan->phy_dev; 333 334 return vlan_vid_add(phy_dev, proto, vid); 335 } 336 337 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto, 338 u16 vid) 339 { 340 struct ipvl_dev *ipvlan = netdev_priv(dev); 341 struct net_device *phy_dev = ipvlan->phy_dev; 342 343 vlan_vid_del(phy_dev, proto, vid); 344 return 0; 345 } 346 347 static int ipvlan_get_iflink(const struct net_device *dev) 348 { 349 struct ipvl_dev *ipvlan = netdev_priv(dev); 350 351 return ipvlan->phy_dev->ifindex; 352 } 353 354 static const struct net_device_ops ipvlan_netdev_ops = { 355 .ndo_init = ipvlan_init, 356 .ndo_uninit = ipvlan_uninit, 357 .ndo_open = ipvlan_open, 358 .ndo_stop = ipvlan_stop, 359 .ndo_start_xmit = ipvlan_start_xmit, 360 .ndo_fix_features = ipvlan_fix_features, 361 .ndo_change_rx_flags = ipvlan_change_rx_flags, 362 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter, 363 .ndo_get_stats64 = ipvlan_get_stats64, 364 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid, 365 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid, 366 .ndo_get_iflink = ipvlan_get_iflink, 367 }; 368 369 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 370 unsigned short type, const void *daddr, 371 const void *saddr, unsigned len) 372 { 373 const struct ipvl_dev *ipvlan = netdev_priv(dev); 374 struct net_device *phy_dev = ipvlan->phy_dev; 375 376 /* TODO Probably use a different field than dev_addr so that the 377 * mac-address on the virtual device is portable and can be carried 378 * while the packets use the mac-addr on the physical device. 379 */ 380 return dev_hard_header(skb, phy_dev, type, daddr, 381 saddr ? : phy_dev->dev_addr, len); 382 } 383 384 static const struct header_ops ipvlan_header_ops = { 385 .create = ipvlan_hard_header, 386 .parse = eth_header_parse, 387 .cache = eth_header_cache, 388 .cache_update = eth_header_cache_update, 389 }; 390 391 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev) 392 { 393 ipvlan->dev->mtu = dev->mtu; 394 } 395 396 static bool netif_is_ipvlan(const struct net_device *dev) 397 { 398 /* both ipvlan and ipvtap devices use the same netdev_ops */ 399 return dev->netdev_ops == &ipvlan_netdev_ops; 400 } 401 402 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev, 403 struct ethtool_link_ksettings *cmd) 404 { 405 const struct ipvl_dev *ipvlan = netdev_priv(dev); 406 407 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd); 408 } 409 410 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev, 411 struct ethtool_drvinfo *drvinfo) 412 { 413 strscpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver)); 414 strscpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version)); 415 } 416 417 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev) 418 { 419 const struct ipvl_dev *ipvlan = netdev_priv(dev); 420 421 return ipvlan->msg_enable; 422 } 423 424 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value) 425 { 426 struct ipvl_dev *ipvlan = netdev_priv(dev); 427 428 ipvlan->msg_enable = value; 429 } 430 431 static const struct ethtool_ops ipvlan_ethtool_ops = { 432 .get_link = ethtool_op_get_link, 433 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings, 434 .get_drvinfo = ipvlan_ethtool_get_drvinfo, 435 .get_msglevel = ipvlan_ethtool_get_msglevel, 436 .set_msglevel = ipvlan_ethtool_set_msglevel, 437 }; 438 439 static int ipvlan_nl_changelink(struct net_device *dev, 440 struct nlattr *tb[], struct nlattr *data[], 441 struct netlink_ext_ack *extack) 442 { 443 struct ipvl_dev *ipvlan = netdev_priv(dev); 444 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 445 int err = 0; 446 447 if (!data) 448 return 0; 449 if (!ns_capable(dev_net(ipvlan->phy_dev)->user_ns, CAP_NET_ADMIN)) 450 return -EPERM; 451 452 if (data[IFLA_IPVLAN_MODE]) { 453 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 454 455 err = ipvlan_set_port_mode(port, nmode, extack); 456 } 457 458 if (!err && data[IFLA_IPVLAN_FLAGS]) { 459 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]); 460 461 if (flags & IPVLAN_F_PRIVATE) 462 ipvlan_mark_private(port); 463 else 464 ipvlan_clear_private(port); 465 466 if (flags & IPVLAN_F_VEPA) 467 ipvlan_mark_vepa(port); 468 else 469 ipvlan_clear_vepa(port); 470 } 471 472 return err; 473 } 474 475 static size_t ipvlan_nl_getsize(const struct net_device *dev) 476 { 477 return (0 478 + nla_total_size(2) /* IFLA_IPVLAN_MODE */ 479 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */ 480 ); 481 } 482 483 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[], 484 struct netlink_ext_ack *extack) 485 { 486 if (!data) 487 return 0; 488 489 if (data[IFLA_IPVLAN_MODE]) { 490 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 491 492 if (mode >= IPVLAN_MODE_MAX) 493 return -EINVAL; 494 } 495 if (data[IFLA_IPVLAN_FLAGS]) { 496 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]); 497 498 /* Only two bits are used at this moment. */ 499 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) 500 return -EINVAL; 501 /* Also both flags can't be active at the same time. */ 502 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) == 503 (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) 504 return -EINVAL; 505 } 506 507 return 0; 508 } 509 510 static int ipvlan_nl_fillinfo(struct sk_buff *skb, 511 const struct net_device *dev) 512 { 513 struct ipvl_dev *ipvlan = netdev_priv(dev); 514 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 515 int ret = -EINVAL; 516 517 if (!port) 518 goto err; 519 520 ret = -EMSGSIZE; 521 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode)) 522 goto err; 523 if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags)) 524 goto err; 525 526 return 0; 527 528 err: 529 return ret; 530 } 531 532 int ipvlan_link_new(struct net *src_net, struct net_device *dev, 533 struct nlattr *tb[], struct nlattr *data[], 534 struct netlink_ext_ack *extack) 535 { 536 struct ipvl_dev *ipvlan = netdev_priv(dev); 537 struct ipvl_port *port; 538 struct net_device *phy_dev; 539 int err; 540 u16 mode = IPVLAN_MODE_L3; 541 542 if (!tb[IFLA_LINK]) 543 return -EINVAL; 544 545 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 546 if (!phy_dev) 547 return -ENODEV; 548 549 if (netif_is_ipvlan(phy_dev)) { 550 struct ipvl_dev *tmp = netdev_priv(phy_dev); 551 552 phy_dev = tmp->phy_dev; 553 if (!ns_capable(dev_net(phy_dev)->user_ns, CAP_NET_ADMIN)) 554 return -EPERM; 555 } else if (!netif_is_ipvlan_port(phy_dev)) { 556 /* Exit early if the underlying link is invalid or busy */ 557 if (phy_dev->type != ARPHRD_ETHER || 558 phy_dev->flags & IFF_LOOPBACK) { 559 netdev_err(phy_dev, 560 "Master is either lo or non-ether device\n"); 561 return -EINVAL; 562 } 563 564 if (netdev_is_rx_handler_busy(phy_dev)) { 565 netdev_err(phy_dev, "Device is already in use.\n"); 566 return -EBUSY; 567 } 568 } 569 570 ipvlan->phy_dev = phy_dev; 571 ipvlan->dev = dev; 572 ipvlan->sfeatures = IPVLAN_FEATURES; 573 if (!tb[IFLA_MTU]) 574 ipvlan_adjust_mtu(ipvlan, phy_dev); 575 INIT_LIST_HEAD(&ipvlan->addrs); 576 spin_lock_init(&ipvlan->addrs_lock); 577 578 /* TODO Probably put random address here to be presented to the 579 * world but keep using the physical-dev address for the outgoing 580 * packets. 581 */ 582 eth_hw_addr_set(dev, phy_dev->dev_addr); 583 584 dev->priv_flags |= IFF_NO_RX_HANDLER; 585 586 err = register_netdevice(dev); 587 if (err < 0) 588 return err; 589 590 /* ipvlan_init() would have created the port, if required */ 591 port = ipvlan_port_get_rtnl(phy_dev); 592 ipvlan->port = port; 593 594 /* If the port-id base is at the MAX value, then wrap it around and 595 * begin from 0x1 again. This may be due to a busy system where lots 596 * of slaves are getting created and deleted. 597 */ 598 if (port->dev_id_start == 0xFFFE) 599 port->dev_id_start = 0x1; 600 601 /* Since L2 address is shared among all IPvlan slaves including 602 * master, use unique 16 bit dev-ids to diffentiate among them. 603 * Assign IDs between 0x1 and 0xFFFE (used by the master) to each 604 * slave link [see addrconf_ifid_eui48()]. 605 */ 606 err = ida_simple_get(&port->ida, port->dev_id_start, 0xFFFE, 607 GFP_KERNEL); 608 if (err < 0) 609 err = ida_simple_get(&port->ida, 0x1, port->dev_id_start, 610 GFP_KERNEL); 611 if (err < 0) 612 goto unregister_netdev; 613 dev->dev_id = err; 614 615 /* Increment id-base to the next slot for the future assignment */ 616 port->dev_id_start = err + 1; 617 618 err = netdev_upper_dev_link(phy_dev, dev, extack); 619 if (err) 620 goto remove_ida; 621 622 /* Flags are per port and latest update overrides. User has 623 * to be consistent in setting it just like the mode attribute. 624 */ 625 if (data && data[IFLA_IPVLAN_FLAGS]) 626 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]); 627 628 if (data && data[IFLA_IPVLAN_MODE]) 629 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 630 631 err = ipvlan_set_port_mode(port, mode, extack); 632 if (err) 633 goto unlink_netdev; 634 635 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans); 636 netif_stacked_transfer_operstate(phy_dev, dev); 637 return 0; 638 639 unlink_netdev: 640 netdev_upper_dev_unlink(phy_dev, dev); 641 remove_ida: 642 ida_simple_remove(&port->ida, dev->dev_id); 643 unregister_netdev: 644 unregister_netdevice(dev); 645 return err; 646 } 647 EXPORT_SYMBOL_GPL(ipvlan_link_new); 648 649 void ipvlan_link_delete(struct net_device *dev, struct list_head *head) 650 { 651 struct ipvl_dev *ipvlan = netdev_priv(dev); 652 struct ipvl_addr *addr, *next; 653 654 spin_lock_bh(&ipvlan->addrs_lock); 655 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) { 656 ipvlan_ht_addr_del(addr); 657 list_del_rcu(&addr->anode); 658 kfree_rcu(addr, rcu); 659 } 660 spin_unlock_bh(&ipvlan->addrs_lock); 661 662 ida_simple_remove(&ipvlan->port->ida, dev->dev_id); 663 list_del_rcu(&ipvlan->pnode); 664 unregister_netdevice_queue(dev, head); 665 netdev_upper_dev_unlink(ipvlan->phy_dev, dev); 666 } 667 EXPORT_SYMBOL_GPL(ipvlan_link_delete); 668 669 void ipvlan_link_setup(struct net_device *dev) 670 { 671 ether_setup(dev); 672 673 dev->max_mtu = ETH_MAX_MTU; 674 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 675 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE; 676 dev->netdev_ops = &ipvlan_netdev_ops; 677 dev->needs_free_netdev = true; 678 dev->header_ops = &ipvlan_header_ops; 679 dev->ethtool_ops = &ipvlan_ethtool_ops; 680 } 681 EXPORT_SYMBOL_GPL(ipvlan_link_setup); 682 683 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] = 684 { 685 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 }, 686 [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 }, 687 }; 688 689 static struct net *ipvlan_get_link_net(const struct net_device *dev) 690 { 691 struct ipvl_dev *ipvlan = netdev_priv(dev); 692 693 return dev_net(ipvlan->phy_dev); 694 } 695 696 static struct rtnl_link_ops ipvlan_link_ops = { 697 .kind = "ipvlan", 698 .priv_size = sizeof(struct ipvl_dev), 699 700 .setup = ipvlan_link_setup, 701 .newlink = ipvlan_link_new, 702 .dellink = ipvlan_link_delete, 703 .get_link_net = ipvlan_get_link_net, 704 }; 705 706 int ipvlan_link_register(struct rtnl_link_ops *ops) 707 { 708 ops->get_size = ipvlan_nl_getsize; 709 ops->policy = ipvlan_nl_policy; 710 ops->validate = ipvlan_nl_validate; 711 ops->fill_info = ipvlan_nl_fillinfo; 712 ops->changelink = ipvlan_nl_changelink; 713 ops->maxtype = IFLA_IPVLAN_MAX; 714 return rtnl_link_register(ops); 715 } 716 EXPORT_SYMBOL_GPL(ipvlan_link_register); 717 718 static int ipvlan_device_event(struct notifier_block *unused, 719 unsigned long event, void *ptr) 720 { 721 struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr); 722 struct netdev_notifier_pre_changeaddr_info *prechaddr_info; 723 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 724 struct ipvl_dev *ipvlan, *next; 725 struct ipvl_port *port; 726 LIST_HEAD(lst_kill); 727 int err; 728 729 if (!netif_is_ipvlan_port(dev)) 730 return NOTIFY_DONE; 731 732 port = ipvlan_port_get_rtnl(dev); 733 734 switch (event) { 735 case NETDEV_UP: 736 case NETDEV_CHANGE: 737 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 738 netif_stacked_transfer_operstate(ipvlan->phy_dev, 739 ipvlan->dev); 740 break; 741 742 case NETDEV_REGISTER: { 743 struct net *oldnet, *newnet = dev_net(dev); 744 745 oldnet = read_pnet(&port->pnet); 746 if (net_eq(newnet, oldnet)) 747 break; 748 749 write_pnet(&port->pnet, newnet); 750 751 ipvlan_migrate_l3s_hook(oldnet, newnet); 752 break; 753 } 754 case NETDEV_UNREGISTER: 755 if (dev->reg_state != NETREG_UNREGISTERING) 756 break; 757 758 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode) 759 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev, 760 &lst_kill); 761 unregister_netdevice_many(&lst_kill); 762 break; 763 764 case NETDEV_FEAT_CHANGE: 765 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 766 netif_inherit_tso_max(ipvlan->dev, dev); 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 eth_hw_addr_set(ipvlan->dev, 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 */ 802 static 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 } 831 832 static 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 } 848 849 static 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) 863 static 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 } 877 878 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 879 { 880 return ipvlan_del_addr(ipvlan, ip6_addr, true); 881 } 882 883 static 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 } 906 907 static 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 930 931 static 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 } 945 946 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 947 { 948 return ipvlan_del_addr(ipvlan, ip4_addr, false); 949 } 950 951 static 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 } 977 978 static 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 1001 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = { 1002 .notifier_call = ipvlan_addr4_event, 1003 }; 1004 1005 static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = { 1006 .notifier_call = ipvlan_addr4_validator_event, 1007 }; 1008 1009 static struct notifier_block ipvlan_notifier_block __read_mostly = { 1010 .notifier_call = ipvlan_device_event, 1011 }; 1012 1013 #if IS_ENABLED(CONFIG_IPV6) 1014 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = { 1015 .notifier_call = ipvlan_addr6_event, 1016 }; 1017 1018 static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = { 1019 .notifier_call = ipvlan_addr6_validator_event, 1020 }; 1021 #endif 1022 1023 static 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; 1048 error: 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 1061 static 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 1076 module_init(ipvlan_init_module); 1077 module_exit(ipvlan_cleanup_module); 1078 1079 MODULE_LICENSE("GPL"); 1080 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>"); 1081 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs"); 1082 MODULE_ALIAS_RTNL_LINK("ipvlan"); 1083