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 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 }; 391 392 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev) 393 { 394 ipvlan->dev->mtu = dev->mtu; 395 } 396 397 static bool netif_is_ipvlan(const struct net_device *dev) 398 { 399 /* both ipvlan and ipvtap devices use the same netdev_ops */ 400 return dev->netdev_ops == &ipvlan_netdev_ops; 401 } 402 403 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev, 404 struct ethtool_link_ksettings *cmd) 405 { 406 const struct ipvl_dev *ipvlan = netdev_priv(dev); 407 408 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd); 409 } 410 411 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev, 412 struct ethtool_drvinfo *drvinfo) 413 { 414 strscpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver)); 415 strscpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version)); 416 } 417 418 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev) 419 { 420 const struct ipvl_dev *ipvlan = netdev_priv(dev); 421 422 return ipvlan->msg_enable; 423 } 424 425 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value) 426 { 427 struct ipvl_dev *ipvlan = netdev_priv(dev); 428 429 ipvlan->msg_enable = value; 430 } 431 432 static const struct ethtool_ops ipvlan_ethtool_ops = { 433 .get_link = ethtool_op_get_link, 434 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings, 435 .get_drvinfo = ipvlan_ethtool_get_drvinfo, 436 .get_msglevel = ipvlan_ethtool_get_msglevel, 437 .set_msglevel = ipvlan_ethtool_set_msglevel, 438 }; 439 440 static int ipvlan_nl_changelink(struct net_device *dev, 441 struct nlattr *tb[], struct nlattr *data[], 442 struct netlink_ext_ack *extack) 443 { 444 struct ipvl_dev *ipvlan = netdev_priv(dev); 445 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 446 int err = 0; 447 448 if (!data) 449 return 0; 450 if (!ns_capable(dev_net(ipvlan->phy_dev)->user_ns, CAP_NET_ADMIN)) 451 return -EPERM; 452 453 if (data[IFLA_IPVLAN_MODE]) { 454 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 455 456 err = ipvlan_set_port_mode(port, nmode, extack); 457 } 458 459 if (!err && data[IFLA_IPVLAN_FLAGS]) { 460 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]); 461 462 if (flags & IPVLAN_F_PRIVATE) 463 ipvlan_mark_private(port); 464 else 465 ipvlan_clear_private(port); 466 467 if (flags & IPVLAN_F_VEPA) 468 ipvlan_mark_vepa(port); 469 else 470 ipvlan_clear_vepa(port); 471 } 472 473 return err; 474 } 475 476 static size_t ipvlan_nl_getsize(const struct net_device *dev) 477 { 478 return (0 479 + nla_total_size(2) /* IFLA_IPVLAN_MODE */ 480 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */ 481 ); 482 } 483 484 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[], 485 struct netlink_ext_ack *extack) 486 { 487 if (!data) 488 return 0; 489 490 if (data[IFLA_IPVLAN_MODE]) { 491 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 492 493 if (mode >= IPVLAN_MODE_MAX) 494 return -EINVAL; 495 } 496 if (data[IFLA_IPVLAN_FLAGS]) { 497 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]); 498 499 /* Only two bits are used at this moment. */ 500 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) 501 return -EINVAL; 502 /* Also both flags can't be active at the same time. */ 503 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) == 504 (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) 505 return -EINVAL; 506 } 507 508 return 0; 509 } 510 511 static int ipvlan_nl_fillinfo(struct sk_buff *skb, 512 const struct net_device *dev) 513 { 514 struct ipvl_dev *ipvlan = netdev_priv(dev); 515 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 516 int ret = -EINVAL; 517 518 if (!port) 519 goto err; 520 521 ret = -EMSGSIZE; 522 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode)) 523 goto err; 524 if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags)) 525 goto err; 526 527 return 0; 528 529 err: 530 return ret; 531 } 532 533 int ipvlan_link_new(struct net *src_net, struct net_device *dev, 534 struct nlattr *tb[], struct nlattr *data[], 535 struct netlink_ext_ack *extack) 536 { 537 struct ipvl_dev *ipvlan = netdev_priv(dev); 538 struct ipvl_port *port; 539 struct net_device *phy_dev; 540 int err; 541 u16 mode = IPVLAN_MODE_L3; 542 543 if (!tb[IFLA_LINK]) 544 return -EINVAL; 545 546 phy_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); 547 if (!phy_dev) 548 return -ENODEV; 549 550 if (netif_is_ipvlan(phy_dev)) { 551 struct ipvl_dev *tmp = netdev_priv(phy_dev); 552 553 phy_dev = tmp->phy_dev; 554 if (!ns_capable(dev_net(phy_dev)->user_ns, CAP_NET_ADMIN)) 555 return -EPERM; 556 } else if (!netif_is_ipvlan_port(phy_dev)) { 557 /* Exit early if the underlying link is invalid or busy */ 558 if (phy_dev->type != ARPHRD_ETHER || 559 phy_dev->flags & IFF_LOOPBACK) { 560 netdev_err(phy_dev, 561 "Master is either lo or non-ether device\n"); 562 return -EINVAL; 563 } 564 565 if (netdev_is_rx_handler_busy(phy_dev)) { 566 netdev_err(phy_dev, "Device is already in use.\n"); 567 return -EBUSY; 568 } 569 } 570 571 ipvlan->phy_dev = phy_dev; 572 ipvlan->dev = dev; 573 ipvlan->sfeatures = IPVLAN_FEATURES; 574 if (!tb[IFLA_MTU]) 575 ipvlan_adjust_mtu(ipvlan, phy_dev); 576 INIT_LIST_HEAD(&ipvlan->addrs); 577 spin_lock_init(&ipvlan->addrs_lock); 578 579 /* TODO Probably put random address here to be presented to the 580 * world but keep using the physical-dev address for the outgoing 581 * packets. 582 */ 583 eth_hw_addr_set(dev, phy_dev->dev_addr); 584 585 dev->priv_flags |= IFF_NO_RX_HANDLER; 586 587 err = register_netdevice(dev); 588 if (err < 0) 589 return err; 590 591 /* ipvlan_init() would have created the port, if required */ 592 port = ipvlan_port_get_rtnl(phy_dev); 593 ipvlan->port = port; 594 595 /* If the port-id base is at the MAX value, then wrap it around and 596 * begin from 0x1 again. This may be due to a busy system where lots 597 * of slaves are getting created and deleted. 598 */ 599 if (port->dev_id_start == 0xFFFE) 600 port->dev_id_start = 0x1; 601 602 /* Since L2 address is shared among all IPvlan slaves including 603 * master, use unique 16 bit dev-ids to diffentiate among them. 604 * Assign IDs between 0x1 and 0xFFFE (used by the master) to each 605 * slave link [see addrconf_ifid_eui48()]. 606 */ 607 err = ida_simple_get(&port->ida, port->dev_id_start, 0xFFFE, 608 GFP_KERNEL); 609 if (err < 0) 610 err = ida_simple_get(&port->ida, 0x1, port->dev_id_start, 611 GFP_KERNEL); 612 if (err < 0) 613 goto unregister_netdev; 614 dev->dev_id = err; 615 616 /* Increment id-base to the next slot for the future assignment */ 617 port->dev_id_start = err + 1; 618 619 err = netdev_upper_dev_link(phy_dev, dev, extack); 620 if (err) 621 goto remove_ida; 622 623 /* Flags are per port and latest update overrides. User has 624 * to be consistent in setting it just like the mode attribute. 625 */ 626 if (data && data[IFLA_IPVLAN_FLAGS]) 627 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]); 628 629 if (data && data[IFLA_IPVLAN_MODE]) 630 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 631 632 err = ipvlan_set_port_mode(port, mode, extack); 633 if (err) 634 goto unlink_netdev; 635 636 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans); 637 netif_stacked_transfer_operstate(phy_dev, dev); 638 return 0; 639 640 unlink_netdev: 641 netdev_upper_dev_unlink(phy_dev, dev); 642 remove_ida: 643 ida_simple_remove(&port->ida, dev->dev_id); 644 unregister_netdev: 645 unregister_netdevice(dev); 646 return err; 647 } 648 EXPORT_SYMBOL_GPL(ipvlan_link_new); 649 650 void ipvlan_link_delete(struct net_device *dev, struct list_head *head) 651 { 652 struct ipvl_dev *ipvlan = netdev_priv(dev); 653 struct ipvl_addr *addr, *next; 654 655 spin_lock_bh(&ipvlan->addrs_lock); 656 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) { 657 ipvlan_ht_addr_del(addr); 658 list_del_rcu(&addr->anode); 659 kfree_rcu(addr, rcu); 660 } 661 spin_unlock_bh(&ipvlan->addrs_lock); 662 663 ida_simple_remove(&ipvlan->port->ida, dev->dev_id); 664 list_del_rcu(&ipvlan->pnode); 665 unregister_netdevice_queue(dev, head); 666 netdev_upper_dev_unlink(ipvlan->phy_dev, dev); 667 } 668 EXPORT_SYMBOL_GPL(ipvlan_link_delete); 669 670 void ipvlan_link_setup(struct net_device *dev) 671 { 672 ether_setup(dev); 673 674 dev->max_mtu = ETH_MAX_MTU; 675 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 676 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE; 677 dev->netdev_ops = &ipvlan_netdev_ops; 678 dev->needs_free_netdev = true; 679 dev->header_ops = &ipvlan_header_ops; 680 dev->ethtool_ops = &ipvlan_ethtool_ops; 681 } 682 EXPORT_SYMBOL_GPL(ipvlan_link_setup); 683 684 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] = 685 { 686 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 }, 687 [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 }, 688 }; 689 690 static struct net *ipvlan_get_link_net(const struct net_device *dev) 691 { 692 struct ipvl_dev *ipvlan = netdev_priv(dev); 693 694 return dev_net(ipvlan->phy_dev); 695 } 696 697 static struct rtnl_link_ops ipvlan_link_ops = { 698 .kind = "ipvlan", 699 .priv_size = sizeof(struct ipvl_dev), 700 701 .setup = ipvlan_link_setup, 702 .newlink = ipvlan_link_new, 703 .dellink = ipvlan_link_delete, 704 .get_link_net = ipvlan_get_link_net, 705 }; 706 707 int ipvlan_link_register(struct rtnl_link_ops *ops) 708 { 709 ops->get_size = ipvlan_nl_getsize; 710 ops->policy = ipvlan_nl_policy; 711 ops->validate = ipvlan_nl_validate; 712 ops->fill_info = ipvlan_nl_fillinfo; 713 ops->changelink = ipvlan_nl_changelink; 714 ops->maxtype = IFLA_IPVLAN_MAX; 715 return rtnl_link_register(ops); 716 } 717 EXPORT_SYMBOL_GPL(ipvlan_link_register); 718 719 static int ipvlan_device_event(struct notifier_block *unused, 720 unsigned long event, void *ptr) 721 { 722 struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr); 723 struct netdev_notifier_pre_changeaddr_info *prechaddr_info; 724 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 725 struct ipvl_dev *ipvlan, *next; 726 struct ipvl_port *port; 727 LIST_HEAD(lst_kill); 728 int err; 729 730 if (!netif_is_ipvlan_port(dev)) 731 return NOTIFY_DONE; 732 733 port = ipvlan_port_get_rtnl(dev); 734 735 switch (event) { 736 case NETDEV_UP: 737 case NETDEV_CHANGE: 738 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 739 netif_stacked_transfer_operstate(ipvlan->phy_dev, 740 ipvlan->dev); 741 break; 742 743 case NETDEV_REGISTER: { 744 struct net *oldnet, *newnet = dev_net(dev); 745 746 oldnet = read_pnet(&port->pnet); 747 if (net_eq(newnet, oldnet)) 748 break; 749 750 write_pnet(&port->pnet, newnet); 751 752 if (port->mode == IPVLAN_MODE_L3S) 753 ipvlan_migrate_l3s_hook(oldnet, newnet); 754 break; 755 } 756 case NETDEV_UNREGISTER: 757 if (dev->reg_state != NETREG_UNREGISTERING) 758 break; 759 760 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode) 761 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev, 762 &lst_kill); 763 unregister_netdevice_many(&lst_kill); 764 break; 765 766 case NETDEV_FEAT_CHANGE: 767 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 768 netif_inherit_tso_max(ipvlan->dev, dev); 769 netdev_update_features(ipvlan->dev); 770 } 771 break; 772 773 case NETDEV_CHANGEMTU: 774 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 775 ipvlan_adjust_mtu(ipvlan, dev); 776 break; 777 778 case NETDEV_PRE_CHANGEADDR: 779 prechaddr_info = ptr; 780 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 781 err = dev_pre_changeaddr_notify(ipvlan->dev, 782 prechaddr_info->dev_addr, 783 extack); 784 if (err) 785 return notifier_from_errno(err); 786 } 787 break; 788 789 case NETDEV_CHANGEADDR: 790 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 791 eth_hw_addr_set(ipvlan->dev, dev->dev_addr); 792 call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev); 793 } 794 break; 795 796 case NETDEV_PRE_TYPE_CHANGE: 797 /* Forbid underlying device to change its type. */ 798 return NOTIFY_BAD; 799 } 800 return NOTIFY_DONE; 801 } 802 803 /* the caller must held the addrs lock */ 804 static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6) 805 { 806 struct ipvl_addr *addr; 807 808 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC); 809 if (!addr) 810 return -ENOMEM; 811 812 addr->master = ipvlan; 813 if (!is_v6) { 814 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr)); 815 addr->atype = IPVL_IPV4; 816 #if IS_ENABLED(CONFIG_IPV6) 817 } else { 818 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr)); 819 addr->atype = IPVL_IPV6; 820 #endif 821 } 822 823 list_add_tail_rcu(&addr->anode, &ipvlan->addrs); 824 825 /* If the interface is not up, the address will be added to the hash 826 * list by ipvlan_open. 827 */ 828 if (netif_running(ipvlan->dev)) 829 ipvlan_ht_addr_add(ipvlan, addr); 830 831 return 0; 832 } 833 834 static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6) 835 { 836 struct ipvl_addr *addr; 837 838 spin_lock_bh(&ipvlan->addrs_lock); 839 addr = ipvlan_find_addr(ipvlan, iaddr, is_v6); 840 if (!addr) { 841 spin_unlock_bh(&ipvlan->addrs_lock); 842 return; 843 } 844 845 ipvlan_ht_addr_del(addr); 846 list_del_rcu(&addr->anode); 847 spin_unlock_bh(&ipvlan->addrs_lock); 848 kfree_rcu(addr, rcu); 849 } 850 851 static bool ipvlan_is_valid_dev(const struct net_device *dev) 852 { 853 struct ipvl_dev *ipvlan = netdev_priv(dev); 854 855 if (!netif_is_ipvlan(dev)) 856 return false; 857 858 if (!ipvlan || !ipvlan->port) 859 return false; 860 861 return true; 862 } 863 864 #if IS_ENABLED(CONFIG_IPV6) 865 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 866 { 867 int ret = -EINVAL; 868 869 spin_lock_bh(&ipvlan->addrs_lock); 870 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true)) 871 netif_err(ipvlan, ifup, ipvlan->dev, 872 "Failed to add IPv6=%pI6c addr for %s intf\n", 873 ip6_addr, ipvlan->dev->name); 874 else 875 ret = ipvlan_add_addr(ipvlan, ip6_addr, true); 876 spin_unlock_bh(&ipvlan->addrs_lock); 877 return ret; 878 } 879 880 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 881 { 882 return ipvlan_del_addr(ipvlan, ip6_addr, true); 883 } 884 885 static int ipvlan_addr6_event(struct notifier_block *unused, 886 unsigned long event, void *ptr) 887 { 888 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr; 889 struct net_device *dev = (struct net_device *)if6->idev->dev; 890 struct ipvl_dev *ipvlan = netdev_priv(dev); 891 892 if (!ipvlan_is_valid_dev(dev)) 893 return NOTIFY_DONE; 894 895 switch (event) { 896 case NETDEV_UP: 897 if (ipvlan_add_addr6(ipvlan, &if6->addr)) 898 return NOTIFY_BAD; 899 break; 900 901 case NETDEV_DOWN: 902 ipvlan_del_addr6(ipvlan, &if6->addr); 903 break; 904 } 905 906 return NOTIFY_OK; 907 } 908 909 static int ipvlan_addr6_validator_event(struct notifier_block *unused, 910 unsigned long event, void *ptr) 911 { 912 struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr; 913 struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev; 914 struct ipvl_dev *ipvlan = netdev_priv(dev); 915 916 if (!ipvlan_is_valid_dev(dev)) 917 return NOTIFY_DONE; 918 919 switch (event) { 920 case NETDEV_UP: 921 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) { 922 NL_SET_ERR_MSG(i6vi->extack, 923 "Address already assigned to an ipvlan device"); 924 return notifier_from_errno(-EADDRINUSE); 925 } 926 break; 927 } 928 929 return NOTIFY_OK; 930 } 931 #endif 932 933 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 934 { 935 int ret = -EINVAL; 936 937 spin_lock_bh(&ipvlan->addrs_lock); 938 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false)) 939 netif_err(ipvlan, ifup, ipvlan->dev, 940 "Failed to add IPv4=%pI4 on %s intf.\n", 941 ip4_addr, ipvlan->dev->name); 942 else 943 ret = ipvlan_add_addr(ipvlan, ip4_addr, false); 944 spin_unlock_bh(&ipvlan->addrs_lock); 945 return ret; 946 } 947 948 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 949 { 950 return ipvlan_del_addr(ipvlan, ip4_addr, false); 951 } 952 953 static int ipvlan_addr4_event(struct notifier_block *unused, 954 unsigned long event, void *ptr) 955 { 956 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr; 957 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev; 958 struct ipvl_dev *ipvlan = netdev_priv(dev); 959 struct in_addr ip4_addr; 960 961 if (!ipvlan_is_valid_dev(dev)) 962 return NOTIFY_DONE; 963 964 switch (event) { 965 case NETDEV_UP: 966 ip4_addr.s_addr = if4->ifa_address; 967 if (ipvlan_add_addr4(ipvlan, &ip4_addr)) 968 return NOTIFY_BAD; 969 break; 970 971 case NETDEV_DOWN: 972 ip4_addr.s_addr = if4->ifa_address; 973 ipvlan_del_addr4(ipvlan, &ip4_addr); 974 break; 975 } 976 977 return NOTIFY_OK; 978 } 979 980 static int ipvlan_addr4_validator_event(struct notifier_block *unused, 981 unsigned long event, void *ptr) 982 { 983 struct in_validator_info *ivi = (struct in_validator_info *)ptr; 984 struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev; 985 struct ipvl_dev *ipvlan = netdev_priv(dev); 986 987 if (!ipvlan_is_valid_dev(dev)) 988 return NOTIFY_DONE; 989 990 switch (event) { 991 case NETDEV_UP: 992 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) { 993 NL_SET_ERR_MSG(ivi->extack, 994 "Address already assigned to an ipvlan device"); 995 return notifier_from_errno(-EADDRINUSE); 996 } 997 break; 998 } 999 1000 return NOTIFY_OK; 1001 } 1002 1003 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = { 1004 .notifier_call = ipvlan_addr4_event, 1005 }; 1006 1007 static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = { 1008 .notifier_call = ipvlan_addr4_validator_event, 1009 }; 1010 1011 static struct notifier_block ipvlan_notifier_block __read_mostly = { 1012 .notifier_call = ipvlan_device_event, 1013 }; 1014 1015 #if IS_ENABLED(CONFIG_IPV6) 1016 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = { 1017 .notifier_call = ipvlan_addr6_event, 1018 }; 1019 1020 static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = { 1021 .notifier_call = ipvlan_addr6_validator_event, 1022 }; 1023 #endif 1024 1025 static int __init ipvlan_init_module(void) 1026 { 1027 int err; 1028 1029 ipvlan_init_secret(); 1030 register_netdevice_notifier(&ipvlan_notifier_block); 1031 #if IS_ENABLED(CONFIG_IPV6) 1032 register_inet6addr_notifier(&ipvlan_addr6_notifier_block); 1033 register_inet6addr_validator_notifier( 1034 &ipvlan_addr6_vtor_notifier_block); 1035 #endif 1036 register_inetaddr_notifier(&ipvlan_addr4_notifier_block); 1037 register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block); 1038 1039 err = ipvlan_l3s_init(); 1040 if (err < 0) 1041 goto error; 1042 1043 err = ipvlan_link_register(&ipvlan_link_ops); 1044 if (err < 0) { 1045 ipvlan_l3s_cleanup(); 1046 goto error; 1047 } 1048 1049 return 0; 1050 error: 1051 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block); 1052 unregister_inetaddr_validator_notifier( 1053 &ipvlan_addr4_vtor_notifier_block); 1054 #if IS_ENABLED(CONFIG_IPV6) 1055 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block); 1056 unregister_inet6addr_validator_notifier( 1057 &ipvlan_addr6_vtor_notifier_block); 1058 #endif 1059 unregister_netdevice_notifier(&ipvlan_notifier_block); 1060 return err; 1061 } 1062 1063 static void __exit ipvlan_cleanup_module(void) 1064 { 1065 rtnl_link_unregister(&ipvlan_link_ops); 1066 ipvlan_l3s_cleanup(); 1067 unregister_netdevice_notifier(&ipvlan_notifier_block); 1068 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block); 1069 unregister_inetaddr_validator_notifier( 1070 &ipvlan_addr4_vtor_notifier_block); 1071 #if IS_ENABLED(CONFIG_IPV6) 1072 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block); 1073 unregister_inet6addr_validator_notifier( 1074 &ipvlan_addr6_vtor_notifier_block); 1075 #endif 1076 } 1077 1078 module_init(ipvlan_init_module); 1079 module_exit(ipvlan_cleanup_module); 1080 1081 MODULE_LICENSE("GPL"); 1082 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>"); 1083 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs"); 1084 MODULE_ALIAS_RTNL_LINK("ipvlan"); 1085