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 #include <net/netdev_lock.h> 7 8 #include "ipvlan.h" 9 10 static int ipvlan_set_port_mode(struct ipvl_port *port, u16 nval, 11 struct netlink_ext_ack *extack) 12 { 13 struct ipvl_dev *ipvlan; 14 unsigned int flags; 15 int err; 16 17 ASSERT_RTNL(); 18 if (port->mode != nval) { 19 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 20 flags = ipvlan->dev->flags; 21 if (nval == IPVLAN_MODE_L3 || nval == IPVLAN_MODE_L3S) { 22 err = dev_change_flags(ipvlan->dev, 23 flags | IFF_NOARP, 24 extack); 25 } else { 26 err = dev_change_flags(ipvlan->dev, 27 flags & ~IFF_NOARP, 28 extack); 29 } 30 if (unlikely(err)) 31 goto fail; 32 } 33 if (nval == IPVLAN_MODE_L3S) { 34 /* New mode is L3S */ 35 err = ipvlan_l3s_register(port); 36 if (err) 37 goto fail; 38 } else if (port->mode == IPVLAN_MODE_L3S) { 39 /* Old mode was L3S */ 40 ipvlan_l3s_unregister(port); 41 } 42 port->mode = nval; 43 } 44 return 0; 45 46 fail: 47 /* Undo the flags changes that have been done so far. */ 48 list_for_each_entry_continue_reverse(ipvlan, &port->ipvlans, pnode) { 49 flags = ipvlan->dev->flags; 50 if (port->mode == IPVLAN_MODE_L3 || 51 port->mode == IPVLAN_MODE_L3S) 52 dev_change_flags(ipvlan->dev, flags | IFF_NOARP, 53 NULL); 54 else 55 dev_change_flags(ipvlan->dev, flags & ~IFF_NOARP, 56 NULL); 57 } 58 59 return err; 60 } 61 62 static int ipvlan_port_create(struct net_device *dev) 63 { 64 struct ipvl_port *port; 65 int err, idx; 66 67 port = kzalloc(sizeof(struct ipvl_port), GFP_KERNEL); 68 if (!port) 69 return -ENOMEM; 70 71 write_pnet(&port->pnet, dev_net(dev)); 72 port->dev = dev; 73 port->mode = IPVLAN_MODE_L3; 74 INIT_LIST_HEAD(&port->ipvlans); 75 for (idx = 0; idx < IPVLAN_HASH_SIZE; idx++) 76 INIT_HLIST_HEAD(&port->hlhead[idx]); 77 78 spin_lock_init(&port->addrs_lock); 79 skb_queue_head_init(&port->backlog); 80 INIT_WORK(&port->wq, ipvlan_process_multicast); 81 ida_init(&port->ida); 82 port->dev_id_start = 1; 83 84 err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port); 85 if (err) 86 goto err; 87 88 netdev_hold(dev, &port->dev_tracker, GFP_KERNEL); 89 return 0; 90 91 err: 92 kfree(port); 93 return err; 94 } 95 96 static void ipvlan_port_destroy(struct net_device *dev) 97 { 98 struct ipvl_port *port = ipvlan_port_get_rtnl(dev); 99 struct sk_buff *skb; 100 101 netdev_put(dev, &port->dev_tracker); 102 if (port->mode == IPVLAN_MODE_L3S) 103 ipvlan_l3s_unregister(port); 104 netdev_rx_handler_unregister(dev); 105 cancel_work_sync(&port->wq); 106 while ((skb = __skb_dequeue(&port->backlog)) != NULL) { 107 dev_put(skb->dev); 108 kfree_skb(skb); 109 } 110 ida_destroy(&port->ida); 111 kfree(port); 112 } 113 114 #define IPVLAN_ALWAYS_ON_OFLOADS \ 115 (NETIF_F_SG | NETIF_F_HW_CSUM | \ 116 NETIF_F_GSO_ROBUST | NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL) 117 118 #define IPVLAN_ALWAYS_ON \ 119 (IPVLAN_ALWAYS_ON_OFLOADS | NETIF_F_VLAN_CHALLENGED) 120 121 #define IPVLAN_FEATURES \ 122 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 123 NETIF_F_GSO | NETIF_F_ALL_TSO | NETIF_F_GSO_ROBUST | \ 124 NETIF_F_GRO | NETIF_F_RXCSUM | \ 125 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER) 126 127 /* NETIF_F_GSO_ENCAP_ALL NETIF_F_GSO_SOFTWARE Newly added */ 128 129 #define IPVLAN_STATE_MASK \ 130 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 131 132 static int ipvlan_init(struct net_device *dev) 133 { 134 struct ipvl_dev *ipvlan = netdev_priv(dev); 135 struct net_device *phy_dev = ipvlan->phy_dev; 136 struct ipvl_port *port; 137 int err; 138 139 dev->state = (dev->state & ~IPVLAN_STATE_MASK) | 140 (phy_dev->state & IPVLAN_STATE_MASK); 141 dev->features = phy_dev->features & IPVLAN_FEATURES; 142 dev->features |= IPVLAN_ALWAYS_ON; 143 dev->vlan_features = phy_dev->vlan_features & IPVLAN_FEATURES; 144 dev->vlan_features |= IPVLAN_ALWAYS_ON_OFLOADS; 145 dev->hw_enc_features |= dev->features; 146 dev->lltx = true; 147 netif_inherit_tso_max(dev, phy_dev); 148 dev->hard_header_len = phy_dev->hard_header_len; 149 150 netdev_lockdep_set_classes(dev); 151 152 ipvlan->pcpu_stats = netdev_alloc_pcpu_stats(struct ipvl_pcpu_stats); 153 if (!ipvlan->pcpu_stats) 154 return -ENOMEM; 155 156 if (!netif_is_ipvlan_port(phy_dev)) { 157 err = ipvlan_port_create(phy_dev); 158 if (err < 0) { 159 free_percpu(ipvlan->pcpu_stats); 160 return err; 161 } 162 } 163 port = ipvlan_port_get_rtnl(phy_dev); 164 port->count += 1; 165 return 0; 166 } 167 168 static void ipvlan_uninit(struct net_device *dev) 169 { 170 struct ipvl_dev *ipvlan = netdev_priv(dev); 171 struct net_device *phy_dev = ipvlan->phy_dev; 172 struct ipvl_port *port; 173 174 free_percpu(ipvlan->pcpu_stats); 175 176 port = ipvlan_port_get_rtnl(phy_dev); 177 port->count -= 1; 178 if (!port->count) 179 ipvlan_port_destroy(port->dev); 180 } 181 182 static int ipvlan_open(struct net_device *dev) 183 { 184 struct ipvl_dev *ipvlan = netdev_priv(dev); 185 struct ipvl_port *port = ipvlan->port; 186 struct ipvl_addr *addr; 187 188 if (ipvlan->port->mode == IPVLAN_MODE_L3 || 189 ipvlan->port->mode == IPVLAN_MODE_L3S) 190 dev->flags |= IFF_NOARP; 191 else 192 dev->flags &= ~IFF_NOARP; 193 194 spin_lock_bh(&port->addrs_lock); 195 list_for_each_entry(addr, &ipvlan->addrs, anode) 196 ipvlan_ht_addr_add(ipvlan, addr); 197 spin_unlock_bh(&port->addrs_lock); 198 199 return 0; 200 } 201 202 static int ipvlan_stop(struct net_device *dev) 203 { 204 struct ipvl_dev *ipvlan = netdev_priv(dev); 205 struct net_device *phy_dev = ipvlan->phy_dev; 206 struct ipvl_addr *addr; 207 208 dev_uc_unsync(phy_dev, dev); 209 dev_mc_unsync(phy_dev, dev); 210 211 spin_lock_bh(&ipvlan->port->addrs_lock); 212 list_for_each_entry(addr, &ipvlan->addrs, anode) 213 ipvlan_ht_addr_del(addr); 214 spin_unlock_bh(&ipvlan->port->addrs_lock); 215 216 return 0; 217 } 218 219 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb, 220 struct net_device *dev) 221 { 222 const struct ipvl_dev *ipvlan = netdev_priv(dev); 223 int skblen = skb->len; 224 int ret; 225 226 ret = ipvlan_queue_xmit(skb, dev); 227 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 228 struct ipvl_pcpu_stats *pcptr; 229 230 pcptr = this_cpu_ptr(ipvlan->pcpu_stats); 231 232 u64_stats_update_begin(&pcptr->syncp); 233 u64_stats_inc(&pcptr->tx_pkts); 234 u64_stats_add(&pcptr->tx_bytes, skblen); 235 u64_stats_update_end(&pcptr->syncp); 236 } else { 237 this_cpu_inc(ipvlan->pcpu_stats->tx_drps); 238 } 239 return ret; 240 } 241 242 static netdev_features_t ipvlan_fix_features(struct net_device *dev, 243 netdev_features_t features) 244 { 245 struct ipvl_dev *ipvlan = netdev_priv(dev); 246 247 features |= NETIF_F_ALL_FOR_ALL; 248 features &= (ipvlan->sfeatures | ~IPVLAN_FEATURES); 249 features = netdev_increment_features(ipvlan->phy_dev->features, 250 features, features); 251 features |= IPVLAN_ALWAYS_ON; 252 features &= (IPVLAN_FEATURES | IPVLAN_ALWAYS_ON); 253 254 return features; 255 } 256 257 static void ipvlan_change_rx_flags(struct net_device *dev, int change) 258 { 259 struct ipvl_dev *ipvlan = netdev_priv(dev); 260 struct net_device *phy_dev = ipvlan->phy_dev; 261 262 if (change & IFF_ALLMULTI) 263 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1); 264 } 265 266 static void ipvlan_set_multicast_mac_filter(struct net_device *dev) 267 { 268 struct ipvl_dev *ipvlan = netdev_priv(dev); 269 270 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 271 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE); 272 } else { 273 struct netdev_hw_addr *ha; 274 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE); 275 276 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE); 277 netdev_for_each_mc_addr(ha, dev) 278 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters); 279 280 /* Turn-on broadcast bit irrespective of address family, 281 * since broadcast is deferred to a work-queue, hence no 282 * impact on fast-path processing. 283 */ 284 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters); 285 286 bitmap_copy(ipvlan->mac_filters, mc_filters, 287 IPVLAN_MAC_FILTER_SIZE); 288 } 289 dev_uc_sync(ipvlan->phy_dev, dev); 290 dev_mc_sync(ipvlan->phy_dev, dev); 291 } 292 293 static void ipvlan_get_stats64(struct net_device *dev, 294 struct rtnl_link_stats64 *s) 295 { 296 struct ipvl_dev *ipvlan = netdev_priv(dev); 297 298 if (ipvlan->pcpu_stats) { 299 struct ipvl_pcpu_stats *pcptr; 300 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes; 301 u32 rx_errs = 0, tx_drps = 0; 302 u32 strt; 303 int idx; 304 305 for_each_possible_cpu(idx) { 306 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx); 307 do { 308 strt = u64_stats_fetch_begin(&pcptr->syncp); 309 rx_pkts = u64_stats_read(&pcptr->rx_pkts); 310 rx_bytes = u64_stats_read(&pcptr->rx_bytes); 311 rx_mcast = u64_stats_read(&pcptr->rx_mcast); 312 tx_pkts = u64_stats_read(&pcptr->tx_pkts); 313 tx_bytes = u64_stats_read(&pcptr->tx_bytes); 314 } while (u64_stats_fetch_retry(&pcptr->syncp, 315 strt)); 316 317 s->rx_packets += rx_pkts; 318 s->rx_bytes += rx_bytes; 319 s->multicast += rx_mcast; 320 s->tx_packets += tx_pkts; 321 s->tx_bytes += tx_bytes; 322 323 /* u32 values are updated without syncp protection. */ 324 rx_errs += READ_ONCE(pcptr->rx_errs); 325 tx_drps += READ_ONCE(pcptr->tx_drps); 326 } 327 s->rx_errors = rx_errs; 328 s->rx_dropped = rx_errs; 329 s->tx_dropped = tx_drps; 330 } 331 s->tx_errors = DEV_STATS_READ(dev, tx_errors); 332 } 333 334 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid) 335 { 336 struct ipvl_dev *ipvlan = netdev_priv(dev); 337 struct net_device *phy_dev = ipvlan->phy_dev; 338 339 return vlan_vid_add(phy_dev, proto, vid); 340 } 341 342 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto, 343 u16 vid) 344 { 345 struct ipvl_dev *ipvlan = netdev_priv(dev); 346 struct net_device *phy_dev = ipvlan->phy_dev; 347 348 vlan_vid_del(phy_dev, proto, vid); 349 return 0; 350 } 351 352 static int ipvlan_get_iflink(const struct net_device *dev) 353 { 354 struct ipvl_dev *ipvlan = netdev_priv(dev); 355 356 return READ_ONCE(ipvlan->phy_dev->ifindex); 357 } 358 359 static const struct net_device_ops ipvlan_netdev_ops = { 360 .ndo_init = ipvlan_init, 361 .ndo_uninit = ipvlan_uninit, 362 .ndo_open = ipvlan_open, 363 .ndo_stop = ipvlan_stop, 364 .ndo_start_xmit = ipvlan_start_xmit, 365 .ndo_fix_features = ipvlan_fix_features, 366 .ndo_change_rx_flags = ipvlan_change_rx_flags, 367 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter, 368 .ndo_get_stats64 = ipvlan_get_stats64, 369 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid, 370 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid, 371 .ndo_get_iflink = ipvlan_get_iflink, 372 }; 373 374 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 375 unsigned short type, const void *daddr, 376 const void *saddr, unsigned len) 377 { 378 const struct ipvl_dev *ipvlan = netdev_priv(dev); 379 struct net_device *phy_dev = ipvlan->phy_dev; 380 381 /* TODO Probably use a different field than dev_addr so that the 382 * mac-address on the virtual device is portable and can be carried 383 * while the packets use the mac-addr on the physical device. 384 */ 385 return dev_hard_header(skb, phy_dev, type, daddr, 386 saddr ? : phy_dev->dev_addr, len); 387 } 388 389 static const struct header_ops ipvlan_header_ops = { 390 .create = ipvlan_hard_header, 391 .parse = eth_header_parse, 392 .cache = eth_header_cache, 393 .cache_update = eth_header_cache_update, 394 .parse_protocol = eth_header_parse_protocol, 395 }; 396 397 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev) 398 { 399 ipvlan->dev->mtu = dev->mtu; 400 } 401 402 static bool netif_is_ipvlan(const struct net_device *dev) 403 { 404 /* both ipvlan and ipvtap devices use the same netdev_ops */ 405 return dev->netdev_ops == &ipvlan_netdev_ops; 406 } 407 408 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev, 409 struct ethtool_link_ksettings *cmd) 410 { 411 const struct ipvl_dev *ipvlan = netdev_priv(dev); 412 413 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd); 414 } 415 416 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev, 417 struct ethtool_drvinfo *drvinfo) 418 { 419 strscpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver)); 420 strscpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version)); 421 } 422 423 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev) 424 { 425 const struct ipvl_dev *ipvlan = netdev_priv(dev); 426 427 return ipvlan->msg_enable; 428 } 429 430 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value) 431 { 432 struct ipvl_dev *ipvlan = netdev_priv(dev); 433 434 ipvlan->msg_enable = value; 435 } 436 437 static const struct ethtool_ops ipvlan_ethtool_ops = { 438 .get_link = ethtool_op_get_link, 439 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings, 440 .get_drvinfo = ipvlan_ethtool_get_drvinfo, 441 .get_msglevel = ipvlan_ethtool_get_msglevel, 442 .set_msglevel = ipvlan_ethtool_set_msglevel, 443 }; 444 445 static int ipvlan_nl_changelink(struct net_device *dev, 446 struct nlattr *tb[], struct nlattr *data[], 447 struct netlink_ext_ack *extack) 448 { 449 struct ipvl_dev *ipvlan = netdev_priv(dev); 450 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 451 int err = 0; 452 453 if (!data) 454 return 0; 455 if (!ns_capable(dev_net(ipvlan->phy_dev)->user_ns, CAP_NET_ADMIN)) 456 return -EPERM; 457 458 if (data[IFLA_IPVLAN_MODE]) { 459 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 460 461 err = ipvlan_set_port_mode(port, nmode, extack); 462 } 463 464 if (!err && data[IFLA_IPVLAN_FLAGS]) { 465 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]); 466 467 if (flags & IPVLAN_F_PRIVATE) 468 ipvlan_mark_private(port); 469 else 470 ipvlan_clear_private(port); 471 472 if (flags & IPVLAN_F_VEPA) 473 ipvlan_mark_vepa(port); 474 else 475 ipvlan_clear_vepa(port); 476 } 477 478 return err; 479 } 480 481 static size_t ipvlan_nl_getsize(const struct net_device *dev) 482 { 483 return (0 484 + nla_total_size(2) /* IFLA_IPVLAN_MODE */ 485 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */ 486 ); 487 } 488 489 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[], 490 struct netlink_ext_ack *extack) 491 { 492 if (!data) 493 return 0; 494 495 if (data[IFLA_IPVLAN_MODE]) { 496 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 497 498 if (mode >= IPVLAN_MODE_MAX) 499 return -EINVAL; 500 } 501 if (data[IFLA_IPVLAN_FLAGS]) { 502 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]); 503 504 /* Only two bits are used at this moment. */ 505 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) 506 return -EINVAL; 507 /* Also both flags can't be active at the same time. */ 508 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) == 509 (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) 510 return -EINVAL; 511 } 512 513 return 0; 514 } 515 516 static int ipvlan_nl_fillinfo(struct sk_buff *skb, 517 const struct net_device *dev) 518 { 519 struct ipvl_dev *ipvlan = netdev_priv(dev); 520 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 521 int ret = -EINVAL; 522 523 if (!port) 524 goto err; 525 526 ret = -EMSGSIZE; 527 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode)) 528 goto err; 529 if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags)) 530 goto err; 531 532 return 0; 533 534 err: 535 return ret; 536 } 537 538 int ipvlan_link_new(struct net_device *dev, struct rtnl_newlink_params *params, 539 struct netlink_ext_ack *extack) 540 { 541 struct net *link_net = rtnl_newlink_link_net(params); 542 struct ipvl_dev *ipvlan = netdev_priv(dev); 543 struct nlattr **data = params->data; 544 struct nlattr **tb = params->tb; 545 struct ipvl_port *port; 546 struct net_device *phy_dev; 547 int err; 548 u16 mode = IPVLAN_MODE_L3; 549 550 if (!tb[IFLA_LINK]) 551 return -EINVAL; 552 553 phy_dev = __dev_get_by_index(link_net, nla_get_u32(tb[IFLA_LINK])); 554 if (!phy_dev) 555 return -ENODEV; 556 557 if (netif_is_ipvlan(phy_dev)) { 558 struct ipvl_dev *tmp = netdev_priv(phy_dev); 559 560 phy_dev = tmp->phy_dev; 561 if (!ns_capable(dev_net(phy_dev)->user_ns, CAP_NET_ADMIN)) 562 return -EPERM; 563 } else if (!netif_is_ipvlan_port(phy_dev)) { 564 /* Exit early if the underlying link is invalid or busy */ 565 if (phy_dev->type != ARPHRD_ETHER || 566 phy_dev->flags & IFF_LOOPBACK) { 567 netdev_err(phy_dev, 568 "Master is either lo or non-ether device\n"); 569 return -EINVAL; 570 } 571 572 if (netdev_is_rx_handler_busy(phy_dev)) { 573 netdev_err(phy_dev, "Device is already in use.\n"); 574 return -EBUSY; 575 } 576 } 577 578 ipvlan->phy_dev = phy_dev; 579 ipvlan->dev = dev; 580 ipvlan->sfeatures = IPVLAN_FEATURES; 581 if (!tb[IFLA_MTU]) 582 ipvlan_adjust_mtu(ipvlan, phy_dev); 583 INIT_LIST_HEAD(&ipvlan->addrs); 584 585 /* TODO Probably put random address here to be presented to the 586 * world but keep using the physical-dev address for the outgoing 587 * packets. 588 */ 589 eth_hw_addr_set(dev, phy_dev->dev_addr); 590 591 dev->priv_flags |= IFF_NO_RX_HANDLER; 592 593 err = register_netdevice(dev); 594 if (err < 0) 595 return err; 596 597 /* ipvlan_init() would have created the port, if required */ 598 port = ipvlan_port_get_rtnl(phy_dev); 599 ipvlan->port = port; 600 601 /* If the port-id base is at the MAX value, then wrap it around and 602 * begin from 0x1 again. This may be due to a busy system where lots 603 * of slaves are getting created and deleted. 604 */ 605 if (port->dev_id_start == 0xFFFE) 606 port->dev_id_start = 0x1; 607 608 /* Since L2 address is shared among all IPvlan slaves including 609 * master, use unique 16 bit dev-ids to differentiate among them. 610 * Assign IDs between 0x1 and 0xFFFE (used by the master) to each 611 * slave link [see addrconf_ifid_eui48()]. 612 */ 613 err = ida_alloc_range(&port->ida, port->dev_id_start, 0xFFFD, 614 GFP_KERNEL); 615 if (err < 0) 616 err = ida_alloc_range(&port->ida, 0x1, port->dev_id_start - 1, 617 GFP_KERNEL); 618 if (err < 0) 619 goto unregister_netdev; 620 dev->dev_id = err; 621 622 /* Increment id-base to the next slot for the future assignment */ 623 port->dev_id_start = err + 1; 624 625 err = netdev_upper_dev_link(phy_dev, dev, extack); 626 if (err) 627 goto remove_ida; 628 629 /* Flags are per port and latest update overrides. User has 630 * to be consistent in setting it just like the mode attribute. 631 */ 632 if (data && data[IFLA_IPVLAN_FLAGS]) 633 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]); 634 635 if (data && data[IFLA_IPVLAN_MODE]) 636 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 637 638 err = ipvlan_set_port_mode(port, mode, extack); 639 if (err) 640 goto unlink_netdev; 641 642 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans); 643 netif_stacked_transfer_operstate(phy_dev, dev); 644 return 0; 645 646 unlink_netdev: 647 netdev_upper_dev_unlink(phy_dev, dev); 648 remove_ida: 649 ida_free(&port->ida, dev->dev_id); 650 unregister_netdev: 651 unregister_netdevice(dev); 652 return err; 653 } 654 EXPORT_SYMBOL_GPL(ipvlan_link_new); 655 656 void ipvlan_link_delete(struct net_device *dev, struct list_head *head) 657 { 658 struct ipvl_dev *ipvlan = netdev_priv(dev); 659 struct ipvl_addr *addr, *next; 660 661 spin_lock_bh(&ipvlan->port->addrs_lock); 662 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) { 663 ipvlan_ht_addr_del(addr); 664 list_del_rcu(&addr->anode); 665 kfree_rcu(addr, rcu); 666 } 667 spin_unlock_bh(&ipvlan->port->addrs_lock); 668 669 ida_free(&ipvlan->port->ida, dev->dev_id); 670 list_del_rcu(&ipvlan->pnode); 671 unregister_netdevice_queue(dev, head); 672 netdev_upper_dev_unlink(ipvlan->phy_dev, dev); 673 } 674 EXPORT_SYMBOL_GPL(ipvlan_link_delete); 675 676 void ipvlan_link_setup(struct net_device *dev) 677 { 678 ether_setup(dev); 679 680 dev->max_mtu = ETH_MAX_MTU; 681 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 682 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE; 683 dev->netdev_ops = &ipvlan_netdev_ops; 684 dev->needs_free_netdev = true; 685 dev->header_ops = &ipvlan_header_ops; 686 dev->ethtool_ops = &ipvlan_ethtool_ops; 687 } 688 EXPORT_SYMBOL_GPL(ipvlan_link_setup); 689 690 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] = 691 { 692 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 }, 693 [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 }, 694 }; 695 696 static struct net *ipvlan_get_link_net(const struct net_device *dev) 697 { 698 struct ipvl_dev *ipvlan = netdev_priv(dev); 699 700 return dev_net(ipvlan->phy_dev); 701 } 702 703 static struct rtnl_link_ops ipvlan_link_ops = { 704 .kind = "ipvlan", 705 .priv_size = sizeof(struct ipvl_dev), 706 707 .setup = ipvlan_link_setup, 708 .newlink = ipvlan_link_new, 709 .dellink = ipvlan_link_delete, 710 .get_link_net = ipvlan_get_link_net, 711 }; 712 713 int ipvlan_link_register(struct rtnl_link_ops *ops) 714 { 715 ops->get_size = ipvlan_nl_getsize; 716 ops->policy = ipvlan_nl_policy; 717 ops->validate = ipvlan_nl_validate; 718 ops->fill_info = ipvlan_nl_fillinfo; 719 ops->changelink = ipvlan_nl_changelink; 720 ops->maxtype = IFLA_IPVLAN_MAX; 721 return rtnl_link_register(ops); 722 } 723 EXPORT_SYMBOL_GPL(ipvlan_link_register); 724 725 static int ipvlan_device_event(struct notifier_block *unused, 726 unsigned long event, void *ptr) 727 { 728 struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr); 729 struct netdev_notifier_pre_changeaddr_info *prechaddr_info; 730 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 731 struct ipvl_dev *ipvlan, *next; 732 struct ipvl_port *port; 733 LIST_HEAD(lst_kill); 734 int err; 735 736 if (!netif_is_ipvlan_port(dev)) 737 return NOTIFY_DONE; 738 739 port = ipvlan_port_get_rtnl(dev); 740 741 switch (event) { 742 case NETDEV_UP: 743 case NETDEV_DOWN: 744 case NETDEV_CHANGE: 745 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 746 netif_stacked_transfer_operstate(ipvlan->phy_dev, 747 ipvlan->dev); 748 break; 749 750 case NETDEV_REGISTER: { 751 struct net *oldnet, *newnet = dev_net(dev); 752 753 oldnet = read_pnet(&port->pnet); 754 if (net_eq(newnet, oldnet)) 755 break; 756 757 write_pnet(&port->pnet, newnet); 758 759 if (port->mode == IPVLAN_MODE_L3S) 760 ipvlan_migrate_l3s_hook(oldnet, newnet); 761 break; 762 } 763 case NETDEV_UNREGISTER: 764 if (dev->reg_state != NETREG_UNREGISTERING) 765 break; 766 767 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode) 768 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev, 769 &lst_kill); 770 unregister_netdevice_many(&lst_kill); 771 break; 772 773 case NETDEV_FEAT_CHANGE: 774 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 775 netif_inherit_tso_max(ipvlan->dev, dev); 776 netdev_update_features(ipvlan->dev); 777 } 778 break; 779 780 case NETDEV_CHANGEMTU: 781 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 782 ipvlan_adjust_mtu(ipvlan, dev); 783 break; 784 785 case NETDEV_PRE_CHANGEADDR: 786 prechaddr_info = ptr; 787 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 788 err = netif_pre_changeaddr_notify(ipvlan->dev, 789 prechaddr_info->dev_addr, 790 extack); 791 if (err) 792 return notifier_from_errno(err); 793 } 794 break; 795 796 case NETDEV_CHANGEADDR: 797 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 798 eth_hw_addr_set(ipvlan->dev, dev->dev_addr); 799 call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev); 800 } 801 break; 802 803 case NETDEV_PRE_TYPE_CHANGE: 804 /* Forbid underlying device to change its type. */ 805 return NOTIFY_BAD; 806 807 case NETDEV_NOTIFY_PEERS: 808 case NETDEV_BONDING_FAILOVER: 809 case NETDEV_RESEND_IGMP: 810 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 811 call_netdevice_notifiers(event, ipvlan->dev); 812 } 813 return NOTIFY_DONE; 814 } 815 816 /* the caller must held the addrs lock */ 817 static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6) 818 { 819 struct ipvl_addr *addr; 820 821 assert_spin_locked(&ipvlan->port->addrs_lock); 822 823 addr = kzalloc(sizeof(struct ipvl_addr), GFP_ATOMIC); 824 if (!addr) 825 return -ENOMEM; 826 827 addr->master = ipvlan; 828 if (!is_v6) { 829 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr)); 830 addr->atype = IPVL_IPV4; 831 #if IS_ENABLED(CONFIG_IPV6) 832 } else { 833 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr)); 834 addr->atype = IPVL_IPV6; 835 #endif 836 } 837 838 list_add_tail_rcu(&addr->anode, &ipvlan->addrs); 839 840 /* If the interface is not up, the address will be added to the hash 841 * list by ipvlan_open. 842 */ 843 if (netif_running(ipvlan->dev)) 844 ipvlan_ht_addr_add(ipvlan, addr); 845 846 return 0; 847 } 848 849 static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6) 850 { 851 struct ipvl_addr *addr; 852 853 spin_lock_bh(&ipvlan->port->addrs_lock); 854 addr = ipvlan_find_addr(ipvlan, iaddr, is_v6); 855 if (!addr) { 856 spin_unlock_bh(&ipvlan->port->addrs_lock); 857 return; 858 } 859 860 ipvlan_ht_addr_del(addr); 861 list_del_rcu(&addr->anode); 862 spin_unlock_bh(&ipvlan->port->addrs_lock); 863 kfree_rcu(addr, rcu); 864 } 865 866 static bool ipvlan_is_valid_dev(const struct net_device *dev) 867 { 868 struct ipvl_dev *ipvlan = netdev_priv(dev); 869 870 if (!netif_is_ipvlan(dev)) 871 return false; 872 873 if (!ipvlan || !ipvlan->port) 874 return false; 875 876 return true; 877 } 878 879 #if IS_ENABLED(CONFIG_IPV6) 880 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 881 { 882 int ret = -EINVAL; 883 884 spin_lock_bh(&ipvlan->port->addrs_lock); 885 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true)) 886 netif_err(ipvlan, ifup, ipvlan->dev, 887 "Failed to add IPv6=%pI6c addr for %s intf\n", 888 ip6_addr, ipvlan->dev->name); 889 else 890 ret = ipvlan_add_addr(ipvlan, ip6_addr, true); 891 spin_unlock_bh(&ipvlan->port->addrs_lock); 892 return ret; 893 } 894 895 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 896 { 897 return ipvlan_del_addr(ipvlan, ip6_addr, true); 898 } 899 900 static int ipvlan_addr6_event(struct notifier_block *unused, 901 unsigned long event, void *ptr) 902 { 903 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr; 904 struct net_device *dev = (struct net_device *)if6->idev->dev; 905 struct ipvl_dev *ipvlan = netdev_priv(dev); 906 907 if (!ipvlan_is_valid_dev(dev)) 908 return NOTIFY_DONE; 909 910 switch (event) { 911 case NETDEV_UP: 912 if (ipvlan_add_addr6(ipvlan, &if6->addr)) 913 return NOTIFY_BAD; 914 break; 915 916 case NETDEV_DOWN: 917 ipvlan_del_addr6(ipvlan, &if6->addr); 918 break; 919 } 920 921 return NOTIFY_OK; 922 } 923 924 static int ipvlan_addr6_validator_event(struct notifier_block *unused, 925 unsigned long event, void *ptr) 926 { 927 struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr; 928 struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev; 929 struct ipvl_dev *ipvlan = netdev_priv(dev); 930 int ret = NOTIFY_OK; 931 932 if (!ipvlan_is_valid_dev(dev)) 933 return NOTIFY_DONE; 934 935 switch (event) { 936 case NETDEV_UP: 937 spin_lock_bh(&ipvlan->port->addrs_lock); 938 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) { 939 NL_SET_ERR_MSG(i6vi->extack, 940 "Address already assigned to an ipvlan device"); 941 ret = notifier_from_errno(-EADDRINUSE); 942 } 943 spin_unlock_bh(&ipvlan->port->addrs_lock); 944 break; 945 } 946 947 return ret; 948 } 949 #endif 950 951 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 952 { 953 int ret = -EINVAL; 954 955 spin_lock_bh(&ipvlan->port->addrs_lock); 956 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false)) 957 netif_err(ipvlan, ifup, ipvlan->dev, 958 "Failed to add IPv4=%pI4 on %s intf.\n", 959 ip4_addr, ipvlan->dev->name); 960 else 961 ret = ipvlan_add_addr(ipvlan, ip4_addr, false); 962 spin_unlock_bh(&ipvlan->port->addrs_lock); 963 return ret; 964 } 965 966 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 967 { 968 return ipvlan_del_addr(ipvlan, ip4_addr, false); 969 } 970 971 static int ipvlan_addr4_event(struct notifier_block *unused, 972 unsigned long event, void *ptr) 973 { 974 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr; 975 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev; 976 struct ipvl_dev *ipvlan = netdev_priv(dev); 977 struct in_addr ip4_addr; 978 979 if (!ipvlan_is_valid_dev(dev)) 980 return NOTIFY_DONE; 981 982 switch (event) { 983 case NETDEV_UP: 984 ip4_addr.s_addr = if4->ifa_address; 985 if (ipvlan_add_addr4(ipvlan, &ip4_addr)) 986 return NOTIFY_BAD; 987 break; 988 989 case NETDEV_DOWN: 990 ip4_addr.s_addr = if4->ifa_address; 991 ipvlan_del_addr4(ipvlan, &ip4_addr); 992 break; 993 } 994 995 return NOTIFY_OK; 996 } 997 998 static int ipvlan_addr4_validator_event(struct notifier_block *unused, 999 unsigned long event, void *ptr) 1000 { 1001 struct in_validator_info *ivi = (struct in_validator_info *)ptr; 1002 struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev; 1003 struct ipvl_dev *ipvlan = netdev_priv(dev); 1004 int ret = NOTIFY_OK; 1005 1006 if (!ipvlan_is_valid_dev(dev)) 1007 return NOTIFY_DONE; 1008 1009 switch (event) { 1010 case NETDEV_UP: 1011 spin_lock_bh(&ipvlan->port->addrs_lock); 1012 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) { 1013 NL_SET_ERR_MSG(ivi->extack, 1014 "Address already assigned to an ipvlan device"); 1015 ret = notifier_from_errno(-EADDRINUSE); 1016 } 1017 spin_unlock_bh(&ipvlan->port->addrs_lock); 1018 break; 1019 } 1020 1021 return ret; 1022 } 1023 1024 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = { 1025 .notifier_call = ipvlan_addr4_event, 1026 }; 1027 1028 static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = { 1029 .notifier_call = ipvlan_addr4_validator_event, 1030 }; 1031 1032 static struct notifier_block ipvlan_notifier_block __read_mostly = { 1033 .notifier_call = ipvlan_device_event, 1034 }; 1035 1036 #if IS_ENABLED(CONFIG_IPV6) 1037 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = { 1038 .notifier_call = ipvlan_addr6_event, 1039 }; 1040 1041 static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = { 1042 .notifier_call = ipvlan_addr6_validator_event, 1043 }; 1044 #endif 1045 1046 static int __init ipvlan_init_module(void) 1047 { 1048 int err; 1049 1050 ipvlan_init_secret(); 1051 register_netdevice_notifier(&ipvlan_notifier_block); 1052 #if IS_ENABLED(CONFIG_IPV6) 1053 register_inet6addr_notifier(&ipvlan_addr6_notifier_block); 1054 register_inet6addr_validator_notifier( 1055 &ipvlan_addr6_vtor_notifier_block); 1056 #endif 1057 register_inetaddr_notifier(&ipvlan_addr4_notifier_block); 1058 register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block); 1059 1060 err = ipvlan_l3s_init(); 1061 if (err < 0) 1062 goto error; 1063 1064 err = ipvlan_link_register(&ipvlan_link_ops); 1065 if (err < 0) { 1066 ipvlan_l3s_cleanup(); 1067 goto error; 1068 } 1069 1070 return 0; 1071 error: 1072 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block); 1073 unregister_inetaddr_validator_notifier( 1074 &ipvlan_addr4_vtor_notifier_block); 1075 #if IS_ENABLED(CONFIG_IPV6) 1076 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block); 1077 unregister_inet6addr_validator_notifier( 1078 &ipvlan_addr6_vtor_notifier_block); 1079 #endif 1080 unregister_netdevice_notifier(&ipvlan_notifier_block); 1081 return err; 1082 } 1083 1084 static void __exit ipvlan_cleanup_module(void) 1085 { 1086 rtnl_link_unregister(&ipvlan_link_ops); 1087 ipvlan_l3s_cleanup(); 1088 unregister_netdevice_notifier(&ipvlan_notifier_block); 1089 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block); 1090 unregister_inetaddr_validator_notifier( 1091 &ipvlan_addr4_vtor_notifier_block); 1092 #if IS_ENABLED(CONFIG_IPV6) 1093 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block); 1094 unregister_inet6addr_validator_notifier( 1095 &ipvlan_addr6_vtor_notifier_block); 1096 #endif 1097 } 1098 1099 module_init(ipvlan_init_module); 1100 module_exit(ipvlan_cleanup_module); 1101 1102 MODULE_LICENSE("GPL"); 1103 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>"); 1104 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs"); 1105 MODULE_ALIAS_RTNL_LINK("ipvlan"); 1106 MODULE_IMPORT_NS("NETDEV_INTERNAL"); 1107