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_obj(struct ipvl_port); 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 dev->needed_headroom = phy_dev->needed_headroom; 150 dev->needed_tailroom = phy_dev->needed_tailroom; 151 152 netdev_lockdep_set_classes(dev); 153 154 ipvlan->pcpu_stats = netdev_alloc_pcpu_stats(struct ipvl_pcpu_stats); 155 if (!ipvlan->pcpu_stats) 156 return -ENOMEM; 157 158 if (!netif_is_ipvlan_port(phy_dev)) { 159 err = ipvlan_port_create(phy_dev); 160 if (err < 0) { 161 free_percpu(ipvlan->pcpu_stats); 162 return err; 163 } 164 } 165 port = ipvlan_port_get_rtnl(phy_dev); 166 port->count += 1; 167 return 0; 168 } 169 170 static void ipvlan_uninit(struct net_device *dev) 171 { 172 struct ipvl_dev *ipvlan = netdev_priv(dev); 173 struct net_device *phy_dev = ipvlan->phy_dev; 174 struct ipvl_port *port; 175 176 free_percpu(ipvlan->pcpu_stats); 177 178 port = ipvlan_port_get_rtnl(phy_dev); 179 port->count -= 1; 180 if (!port->count) 181 ipvlan_port_destroy(port->dev); 182 } 183 184 static int ipvlan_open(struct net_device *dev) 185 { 186 struct ipvl_dev *ipvlan = netdev_priv(dev); 187 struct ipvl_port *port = ipvlan->port; 188 struct ipvl_addr *addr; 189 190 if (ipvlan->port->mode == IPVLAN_MODE_L3 || 191 ipvlan->port->mode == IPVLAN_MODE_L3S) 192 dev->flags |= IFF_NOARP; 193 else 194 dev->flags &= ~IFF_NOARP; 195 196 spin_lock_bh(&port->addrs_lock); 197 list_for_each_entry(addr, &ipvlan->addrs, anode) 198 ipvlan_ht_addr_add(ipvlan, addr); 199 spin_unlock_bh(&port->addrs_lock); 200 201 return 0; 202 } 203 204 static int ipvlan_stop(struct net_device *dev) 205 { 206 struct ipvl_dev *ipvlan = netdev_priv(dev); 207 struct net_device *phy_dev = ipvlan->phy_dev; 208 struct ipvl_addr *addr; 209 210 dev_uc_unsync(phy_dev, dev); 211 dev_mc_unsync(phy_dev, dev); 212 213 spin_lock_bh(&ipvlan->port->addrs_lock); 214 list_for_each_entry(addr, &ipvlan->addrs, anode) 215 ipvlan_ht_addr_del(addr); 216 spin_unlock_bh(&ipvlan->port->addrs_lock); 217 218 return 0; 219 } 220 221 static netdev_tx_t ipvlan_start_xmit(struct sk_buff *skb, 222 struct net_device *dev) 223 { 224 const struct ipvl_dev *ipvlan = netdev_priv(dev); 225 int skblen = skb->len; 226 int ret; 227 228 ret = ipvlan_queue_xmit(skb, dev); 229 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 230 struct ipvl_pcpu_stats *pcptr; 231 232 pcptr = this_cpu_ptr(ipvlan->pcpu_stats); 233 234 u64_stats_update_begin(&pcptr->syncp); 235 u64_stats_inc(&pcptr->tx_pkts); 236 u64_stats_add(&pcptr->tx_bytes, skblen); 237 u64_stats_update_end(&pcptr->syncp); 238 } else { 239 this_cpu_inc(ipvlan->pcpu_stats->tx_drps); 240 } 241 return ret; 242 } 243 244 static netdev_features_t ipvlan_fix_features(struct net_device *dev, 245 netdev_features_t features) 246 { 247 struct ipvl_dev *ipvlan = netdev_priv(dev); 248 249 features |= NETIF_F_ALL_FOR_ALL; 250 features &= (ipvlan->sfeatures | ~IPVLAN_FEATURES); 251 features = netdev_increment_features(ipvlan->phy_dev->features, 252 features, features); 253 features |= IPVLAN_ALWAYS_ON; 254 features &= (IPVLAN_FEATURES | IPVLAN_ALWAYS_ON); 255 256 return features; 257 } 258 259 static void ipvlan_change_rx_flags(struct net_device *dev, int change) 260 { 261 struct ipvl_dev *ipvlan = netdev_priv(dev); 262 struct net_device *phy_dev = ipvlan->phy_dev; 263 264 if (change & IFF_ALLMULTI) 265 dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1); 266 } 267 268 static void ipvlan_set_multicast_mac_filter(struct net_device *dev) 269 { 270 struct ipvl_dev *ipvlan = netdev_priv(dev); 271 272 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 273 bitmap_fill(ipvlan->mac_filters, IPVLAN_MAC_FILTER_SIZE); 274 } else { 275 struct netdev_hw_addr *ha; 276 DECLARE_BITMAP(mc_filters, IPVLAN_MAC_FILTER_SIZE); 277 278 bitmap_zero(mc_filters, IPVLAN_MAC_FILTER_SIZE); 279 netdev_for_each_mc_addr(ha, dev) 280 __set_bit(ipvlan_mac_hash(ha->addr), mc_filters); 281 282 /* Turn-on broadcast bit irrespective of address family, 283 * since broadcast is deferred to a work-queue, hence no 284 * impact on fast-path processing. 285 */ 286 __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters); 287 288 bitmap_copy(ipvlan->mac_filters, mc_filters, 289 IPVLAN_MAC_FILTER_SIZE); 290 } 291 dev_uc_sync(ipvlan->phy_dev, dev); 292 dev_mc_sync(ipvlan->phy_dev, dev); 293 } 294 295 static void ipvlan_get_stats64(struct net_device *dev, 296 struct rtnl_link_stats64 *s) 297 { 298 struct ipvl_dev *ipvlan = netdev_priv(dev); 299 300 if (ipvlan->pcpu_stats) { 301 struct ipvl_pcpu_stats *pcptr; 302 u64 rx_pkts, rx_bytes, rx_mcast, tx_pkts, tx_bytes; 303 u32 rx_errs = 0, tx_drps = 0; 304 u32 strt; 305 int idx; 306 307 for_each_possible_cpu(idx) { 308 pcptr = per_cpu_ptr(ipvlan->pcpu_stats, idx); 309 do { 310 strt = u64_stats_fetch_begin(&pcptr->syncp); 311 rx_pkts = u64_stats_read(&pcptr->rx_pkts); 312 rx_bytes = u64_stats_read(&pcptr->rx_bytes); 313 rx_mcast = u64_stats_read(&pcptr->rx_mcast); 314 tx_pkts = u64_stats_read(&pcptr->tx_pkts); 315 tx_bytes = u64_stats_read(&pcptr->tx_bytes); 316 } while (u64_stats_fetch_retry(&pcptr->syncp, 317 strt)); 318 319 s->rx_packets += rx_pkts; 320 s->rx_bytes += rx_bytes; 321 s->multicast += rx_mcast; 322 s->tx_packets += tx_pkts; 323 s->tx_bytes += tx_bytes; 324 325 /* u32 values are updated without syncp protection. */ 326 rx_errs += READ_ONCE(pcptr->rx_errs); 327 tx_drps += READ_ONCE(pcptr->tx_drps); 328 } 329 s->rx_errors = rx_errs; 330 s->rx_dropped = rx_errs; 331 s->tx_dropped = tx_drps; 332 } 333 s->tx_errors = DEV_STATS_READ(dev, tx_errors); 334 } 335 336 static int ipvlan_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid) 337 { 338 struct ipvl_dev *ipvlan = netdev_priv(dev); 339 struct net_device *phy_dev = ipvlan->phy_dev; 340 341 return vlan_vid_add(phy_dev, proto, vid); 342 } 343 344 static int ipvlan_vlan_rx_kill_vid(struct net_device *dev, __be16 proto, 345 u16 vid) 346 { 347 struct ipvl_dev *ipvlan = netdev_priv(dev); 348 struct net_device *phy_dev = ipvlan->phy_dev; 349 350 vlan_vid_del(phy_dev, proto, vid); 351 return 0; 352 } 353 354 static int ipvlan_get_iflink(const struct net_device *dev) 355 { 356 struct ipvl_dev *ipvlan = netdev_priv(dev); 357 358 return READ_ONCE(ipvlan->phy_dev->ifindex); 359 } 360 361 static const struct net_device_ops ipvlan_netdev_ops = { 362 .ndo_init = ipvlan_init, 363 .ndo_uninit = ipvlan_uninit, 364 .ndo_open = ipvlan_open, 365 .ndo_stop = ipvlan_stop, 366 .ndo_start_xmit = ipvlan_start_xmit, 367 .ndo_fix_features = ipvlan_fix_features, 368 .ndo_change_rx_flags = ipvlan_change_rx_flags, 369 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter, 370 .ndo_get_stats64 = ipvlan_get_stats64, 371 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid, 372 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid, 373 .ndo_get_iflink = ipvlan_get_iflink, 374 }; 375 376 static int ipvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 377 unsigned short type, const void *daddr, 378 const void *saddr, unsigned len) 379 { 380 const struct ipvl_dev *ipvlan = netdev_priv(dev); 381 struct net_device *phy_dev = ipvlan->phy_dev; 382 383 /* TODO Probably use a different field than dev_addr so that the 384 * mac-address on the virtual device is portable and can be carried 385 * while the packets use the mac-addr on the physical device. 386 */ 387 return dev_hard_header(skb, phy_dev, type, daddr, 388 saddr ? : phy_dev->dev_addr, len); 389 } 390 391 static const struct header_ops ipvlan_header_ops = { 392 .create = ipvlan_hard_header, 393 .parse = eth_header_parse, 394 .cache = eth_header_cache, 395 .cache_update = eth_header_cache_update, 396 .parse_protocol = eth_header_parse_protocol, 397 }; 398 399 static void ipvlan_adjust_mtu(struct ipvl_dev *ipvlan, struct net_device *dev) 400 { 401 ipvlan->dev->mtu = dev->mtu; 402 } 403 404 static bool netif_is_ipvlan(const struct net_device *dev) 405 { 406 /* both ipvlan and ipvtap devices use the same netdev_ops */ 407 return dev->netdev_ops == &ipvlan_netdev_ops; 408 } 409 410 static int ipvlan_ethtool_get_link_ksettings(struct net_device *dev, 411 struct ethtool_link_ksettings *cmd) 412 { 413 const struct ipvl_dev *ipvlan = netdev_priv(dev); 414 415 return __ethtool_get_link_ksettings(ipvlan->phy_dev, cmd); 416 } 417 418 static void ipvlan_ethtool_get_drvinfo(struct net_device *dev, 419 struct ethtool_drvinfo *drvinfo) 420 { 421 strscpy(drvinfo->driver, IPVLAN_DRV, sizeof(drvinfo->driver)); 422 strscpy(drvinfo->version, IPV_DRV_VER, sizeof(drvinfo->version)); 423 } 424 425 static u32 ipvlan_ethtool_get_msglevel(struct net_device *dev) 426 { 427 const struct ipvl_dev *ipvlan = netdev_priv(dev); 428 429 return ipvlan->msg_enable; 430 } 431 432 static void ipvlan_ethtool_set_msglevel(struct net_device *dev, u32 value) 433 { 434 struct ipvl_dev *ipvlan = netdev_priv(dev); 435 436 ipvlan->msg_enable = value; 437 } 438 439 static const struct ethtool_ops ipvlan_ethtool_ops = { 440 .get_link = ethtool_op_get_link, 441 .get_link_ksettings = ipvlan_ethtool_get_link_ksettings, 442 .get_drvinfo = ipvlan_ethtool_get_drvinfo, 443 .get_msglevel = ipvlan_ethtool_get_msglevel, 444 .set_msglevel = ipvlan_ethtool_set_msglevel, 445 }; 446 447 static int ipvlan_nl_changelink(struct net_device *dev, 448 struct nlattr *tb[], struct nlattr *data[], 449 struct netlink_ext_ack *extack) 450 { 451 struct ipvl_dev *ipvlan = netdev_priv(dev); 452 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 453 int err = 0; 454 455 if (!data) 456 return 0; 457 if (!ns_capable(dev_net(ipvlan->phy_dev)->user_ns, CAP_NET_ADMIN)) 458 return -EPERM; 459 460 if (data[IFLA_IPVLAN_MODE]) { 461 u16 nmode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 462 463 err = ipvlan_set_port_mode(port, nmode, extack); 464 } 465 466 if (!err && data[IFLA_IPVLAN_FLAGS]) { 467 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]); 468 469 if (flags & IPVLAN_F_PRIVATE) 470 ipvlan_mark_private(port); 471 else 472 ipvlan_clear_private(port); 473 474 if (flags & IPVLAN_F_VEPA) 475 ipvlan_mark_vepa(port); 476 else 477 ipvlan_clear_vepa(port); 478 } 479 480 return err; 481 } 482 483 static size_t ipvlan_nl_getsize(const struct net_device *dev) 484 { 485 return (0 486 + nla_total_size(2) /* IFLA_IPVLAN_MODE */ 487 + nla_total_size(2) /* IFLA_IPVLAN_FLAGS */ 488 ); 489 } 490 491 static int ipvlan_nl_validate(struct nlattr *tb[], struct nlattr *data[], 492 struct netlink_ext_ack *extack) 493 { 494 if (!data) 495 return 0; 496 497 if (data[IFLA_IPVLAN_MODE]) { 498 u16 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 499 500 if (mode >= IPVLAN_MODE_MAX) 501 return -EINVAL; 502 } 503 if (data[IFLA_IPVLAN_FLAGS]) { 504 u16 flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]); 505 506 /* Only two bits are used at this moment. */ 507 if (flags & ~(IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) 508 return -EINVAL; 509 /* Also both flags can't be active at the same time. */ 510 if ((flags & (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) == 511 (IPVLAN_F_PRIVATE | IPVLAN_F_VEPA)) 512 return -EINVAL; 513 } 514 515 return 0; 516 } 517 518 static int ipvlan_nl_fillinfo(struct sk_buff *skb, 519 const struct net_device *dev) 520 { 521 struct ipvl_dev *ipvlan = netdev_priv(dev); 522 struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev); 523 int ret = -EINVAL; 524 525 if (!port) 526 goto err; 527 528 ret = -EMSGSIZE; 529 if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode)) 530 goto err; 531 if (nla_put_u16(skb, IFLA_IPVLAN_FLAGS, port->flags)) 532 goto err; 533 534 return 0; 535 536 err: 537 return ret; 538 } 539 540 int ipvlan_link_new(struct net_device *dev, struct rtnl_newlink_params *params, 541 struct netlink_ext_ack *extack) 542 { 543 struct net *link_net = rtnl_newlink_link_net(params); 544 struct ipvl_dev *ipvlan = netdev_priv(dev); 545 struct nlattr **data = params->data; 546 struct nlattr **tb = params->tb; 547 struct ipvl_port *port; 548 struct net_device *phy_dev; 549 int err; 550 u16 mode = IPVLAN_MODE_L3; 551 552 if (!tb[IFLA_LINK]) 553 return -EINVAL; 554 555 phy_dev = __dev_get_by_index(link_net, nla_get_u32(tb[IFLA_LINK])); 556 if (!phy_dev) 557 return -ENODEV; 558 559 if (netif_is_ipvlan(phy_dev)) { 560 struct ipvl_dev *tmp = netdev_priv(phy_dev); 561 562 phy_dev = tmp->phy_dev; 563 if (!ns_capable(dev_net(phy_dev)->user_ns, CAP_NET_ADMIN)) 564 return -EPERM; 565 } else if (!netif_is_ipvlan_port(phy_dev)) { 566 /* Exit early if the underlying link is invalid or busy */ 567 if (phy_dev->type != ARPHRD_ETHER || 568 phy_dev->flags & IFF_LOOPBACK) { 569 netdev_err(phy_dev, 570 "Master is either lo or non-ether device\n"); 571 return -EINVAL; 572 } 573 574 if (netdev_is_rx_handler_busy(phy_dev)) { 575 netdev_err(phy_dev, "Device is already in use.\n"); 576 return -EBUSY; 577 } 578 } 579 580 ipvlan->phy_dev = phy_dev; 581 ipvlan->dev = dev; 582 ipvlan->sfeatures = IPVLAN_FEATURES; 583 if (!tb[IFLA_MTU]) 584 ipvlan_adjust_mtu(ipvlan, phy_dev); 585 INIT_LIST_HEAD(&ipvlan->addrs); 586 587 /* TODO Probably put random address here to be presented to the 588 * world but keep using the physical-dev address for the outgoing 589 * packets. 590 */ 591 eth_hw_addr_set(dev, phy_dev->dev_addr); 592 593 dev->priv_flags |= IFF_NO_RX_HANDLER; 594 595 err = register_netdevice(dev); 596 if (err < 0) 597 return err; 598 599 /* ipvlan_init() would have created the port, if required */ 600 port = ipvlan_port_get_rtnl(phy_dev); 601 ipvlan->port = port; 602 603 /* If the port-id base is at the MAX value, then wrap it around and 604 * begin from 0x1 again. This may be due to a busy system where lots 605 * of slaves are getting created and deleted. 606 */ 607 if (port->dev_id_start == 0xFFFE) 608 port->dev_id_start = 0x1; 609 610 /* Since L2 address is shared among all IPvlan slaves including 611 * master, use unique 16 bit dev-ids to differentiate among them. 612 * Assign IDs between 0x1 and 0xFFFE (used by the master) to each 613 * slave link [see addrconf_ifid_eui48()]. 614 */ 615 err = ida_alloc_range(&port->ida, port->dev_id_start, 0xFFFD, 616 GFP_KERNEL); 617 if (err < 0) 618 err = ida_alloc_range(&port->ida, 0x1, port->dev_id_start - 1, 619 GFP_KERNEL); 620 if (err < 0) 621 goto unregister_netdev; 622 dev->dev_id = err; 623 624 /* Increment id-base to the next slot for the future assignment */ 625 port->dev_id_start = err + 1; 626 627 err = netdev_upper_dev_link(phy_dev, dev, extack); 628 if (err) 629 goto remove_ida; 630 631 /* Flags are per port and latest update overrides. User has 632 * to be consistent in setting it just like the mode attribute. 633 */ 634 if (data && data[IFLA_IPVLAN_FLAGS]) 635 port->flags = nla_get_u16(data[IFLA_IPVLAN_FLAGS]); 636 637 if (data && data[IFLA_IPVLAN_MODE]) 638 mode = nla_get_u16(data[IFLA_IPVLAN_MODE]); 639 640 err = ipvlan_set_port_mode(port, mode, extack); 641 if (err) 642 goto unlink_netdev; 643 644 list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans); 645 netif_stacked_transfer_operstate(phy_dev, dev); 646 return 0; 647 648 unlink_netdev: 649 netdev_upper_dev_unlink(phy_dev, dev); 650 remove_ida: 651 ida_free(&port->ida, dev->dev_id); 652 unregister_netdev: 653 unregister_netdevice(dev); 654 return err; 655 } 656 EXPORT_SYMBOL_GPL(ipvlan_link_new); 657 658 void ipvlan_link_delete(struct net_device *dev, struct list_head *head) 659 { 660 struct ipvl_dev *ipvlan = netdev_priv(dev); 661 struct ipvl_addr *addr, *next; 662 663 spin_lock_bh(&ipvlan->port->addrs_lock); 664 list_for_each_entry_safe(addr, next, &ipvlan->addrs, anode) { 665 ipvlan_ht_addr_del(addr); 666 list_del_rcu(&addr->anode); 667 kfree_rcu(addr, rcu); 668 } 669 spin_unlock_bh(&ipvlan->port->addrs_lock); 670 671 ida_free(&ipvlan->port->ida, dev->dev_id); 672 list_del_rcu(&ipvlan->pnode); 673 unregister_netdevice_queue(dev, head); 674 netdev_upper_dev_unlink(ipvlan->phy_dev, dev); 675 } 676 EXPORT_SYMBOL_GPL(ipvlan_link_delete); 677 678 void ipvlan_link_setup(struct net_device *dev) 679 { 680 ether_setup(dev); 681 682 dev->max_mtu = ETH_MAX_MTU; 683 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 684 dev->priv_flags |= IFF_UNICAST_FLT | IFF_NO_QUEUE; 685 dev->netdev_ops = &ipvlan_netdev_ops; 686 dev->needs_free_netdev = true; 687 dev->header_ops = &ipvlan_header_ops; 688 dev->ethtool_ops = &ipvlan_ethtool_ops; 689 } 690 EXPORT_SYMBOL_GPL(ipvlan_link_setup); 691 692 static const struct nla_policy ipvlan_nl_policy[IFLA_IPVLAN_MAX + 1] = 693 { 694 [IFLA_IPVLAN_MODE] = { .type = NLA_U16 }, 695 [IFLA_IPVLAN_FLAGS] = { .type = NLA_U16 }, 696 }; 697 698 static struct net *ipvlan_get_link_net(const struct net_device *dev) 699 { 700 struct ipvl_dev *ipvlan = netdev_priv(dev); 701 702 return dev_net(ipvlan->phy_dev); 703 } 704 705 static struct rtnl_link_ops ipvlan_link_ops = { 706 .kind = "ipvlan", 707 .priv_size = sizeof(struct ipvl_dev), 708 709 .setup = ipvlan_link_setup, 710 .newlink = ipvlan_link_new, 711 .dellink = ipvlan_link_delete, 712 .get_link_net = ipvlan_get_link_net, 713 }; 714 715 int ipvlan_link_register(struct rtnl_link_ops *ops) 716 { 717 ops->get_size = ipvlan_nl_getsize; 718 ops->policy = ipvlan_nl_policy; 719 ops->validate = ipvlan_nl_validate; 720 ops->fill_info = ipvlan_nl_fillinfo; 721 ops->changelink = ipvlan_nl_changelink; 722 ops->maxtype = IFLA_IPVLAN_MAX; 723 return rtnl_link_register(ops); 724 } 725 EXPORT_SYMBOL_GPL(ipvlan_link_register); 726 727 static int ipvlan_device_event(struct notifier_block *unused, 728 unsigned long event, void *ptr) 729 { 730 struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr); 731 struct netdev_notifier_pre_changeaddr_info *prechaddr_info; 732 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 733 struct ipvl_dev *ipvlan, *next; 734 struct ipvl_port *port; 735 LIST_HEAD(lst_kill); 736 int err; 737 738 if (!netif_is_ipvlan_port(dev)) 739 return NOTIFY_DONE; 740 741 port = ipvlan_port_get_rtnl(dev); 742 743 switch (event) { 744 case NETDEV_UP: 745 case NETDEV_DOWN: 746 case NETDEV_CHANGE: 747 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 748 netif_stacked_transfer_operstate(ipvlan->phy_dev, 749 ipvlan->dev); 750 break; 751 752 case NETDEV_REGISTER: { 753 struct net *oldnet, *newnet = dev_net(dev); 754 755 oldnet = read_pnet(&port->pnet); 756 if (net_eq(newnet, oldnet)) 757 break; 758 759 write_pnet(&port->pnet, newnet); 760 761 if (port->mode == IPVLAN_MODE_L3S) 762 ipvlan_migrate_l3s_hook(oldnet, newnet); 763 break; 764 } 765 case NETDEV_UNREGISTER: 766 if (dev->reg_state != NETREG_UNREGISTERING) 767 break; 768 769 list_for_each_entry_safe(ipvlan, next, &port->ipvlans, pnode) 770 ipvlan->dev->rtnl_link_ops->dellink(ipvlan->dev, 771 &lst_kill); 772 unregister_netdevice_many(&lst_kill); 773 break; 774 775 case NETDEV_FEAT_CHANGE: 776 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 777 netif_inherit_tso_max(ipvlan->dev, dev); 778 ipvlan->dev->needed_headroom = dev->needed_headroom; 779 ipvlan->dev->needed_tailroom = dev->needed_tailroom; 780 netdev_update_features(ipvlan->dev); 781 } 782 break; 783 784 case NETDEV_CHANGEMTU: 785 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 786 ipvlan_adjust_mtu(ipvlan, dev); 787 break; 788 789 case NETDEV_PRE_CHANGEADDR: 790 prechaddr_info = ptr; 791 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 792 err = netif_pre_changeaddr_notify(ipvlan->dev, 793 prechaddr_info->dev_addr, 794 extack); 795 if (err) 796 return notifier_from_errno(err); 797 } 798 break; 799 800 case NETDEV_CHANGEADDR: 801 list_for_each_entry(ipvlan, &port->ipvlans, pnode) { 802 eth_hw_addr_set(ipvlan->dev, dev->dev_addr); 803 call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev); 804 } 805 break; 806 807 case NETDEV_PRE_TYPE_CHANGE: 808 /* Forbid underlying device to change its type. */ 809 return NOTIFY_BAD; 810 811 case NETDEV_NOTIFY_PEERS: 812 case NETDEV_BONDING_FAILOVER: 813 case NETDEV_RESEND_IGMP: 814 list_for_each_entry(ipvlan, &port->ipvlans, pnode) 815 call_netdevice_notifiers(event, ipvlan->dev); 816 } 817 return NOTIFY_DONE; 818 } 819 820 /* the caller must held the addrs lock */ 821 static int ipvlan_add_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6) 822 { 823 struct ipvl_addr *addr; 824 825 assert_spin_locked(&ipvlan->port->addrs_lock); 826 827 addr = kzalloc_obj(struct ipvl_addr, GFP_ATOMIC); 828 if (!addr) 829 return -ENOMEM; 830 831 addr->master = ipvlan; 832 if (!is_v6) { 833 memcpy(&addr->ip4addr, iaddr, sizeof(struct in_addr)); 834 addr->atype = IPVL_IPV4; 835 #if IS_ENABLED(CONFIG_IPV6) 836 } else { 837 memcpy(&addr->ip6addr, iaddr, sizeof(struct in6_addr)); 838 addr->atype = IPVL_IPV6; 839 #endif 840 } 841 842 list_add_tail_rcu(&addr->anode, &ipvlan->addrs); 843 844 /* If the interface is not up, the address will be added to the hash 845 * list by ipvlan_open. 846 */ 847 if (netif_running(ipvlan->dev)) 848 ipvlan_ht_addr_add(ipvlan, addr); 849 850 return 0; 851 } 852 853 static void ipvlan_del_addr(struct ipvl_dev *ipvlan, void *iaddr, bool is_v6) 854 { 855 struct ipvl_addr *addr; 856 857 spin_lock_bh(&ipvlan->port->addrs_lock); 858 addr = ipvlan_find_addr(ipvlan, iaddr, is_v6); 859 if (!addr) { 860 spin_unlock_bh(&ipvlan->port->addrs_lock); 861 return; 862 } 863 864 ipvlan_ht_addr_del(addr); 865 list_del_rcu(&addr->anode); 866 spin_unlock_bh(&ipvlan->port->addrs_lock); 867 kfree_rcu(addr, rcu); 868 } 869 870 static bool ipvlan_is_valid_dev(const struct net_device *dev) 871 { 872 struct ipvl_dev *ipvlan = netdev_priv(dev); 873 874 if (!netif_is_ipvlan(dev)) 875 return false; 876 877 if (!ipvlan || !ipvlan->port) 878 return false; 879 880 return true; 881 } 882 883 #if IS_ENABLED(CONFIG_IPV6) 884 static int ipvlan_add_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 885 { 886 int ret = -EINVAL; 887 888 spin_lock_bh(&ipvlan->port->addrs_lock); 889 if (ipvlan_addr_busy(ipvlan->port, ip6_addr, true)) 890 netif_err(ipvlan, ifup, ipvlan->dev, 891 "Failed to add IPv6=%pI6c addr for %s intf\n", 892 ip6_addr, ipvlan->dev->name); 893 else 894 ret = ipvlan_add_addr(ipvlan, ip6_addr, true); 895 spin_unlock_bh(&ipvlan->port->addrs_lock); 896 return ret; 897 } 898 899 static void ipvlan_del_addr6(struct ipvl_dev *ipvlan, struct in6_addr *ip6_addr) 900 { 901 return ipvlan_del_addr(ipvlan, ip6_addr, true); 902 } 903 904 static int ipvlan_addr6_event(struct notifier_block *unused, 905 unsigned long event, void *ptr) 906 { 907 struct inet6_ifaddr *if6 = (struct inet6_ifaddr *)ptr; 908 struct net_device *dev = (struct net_device *)if6->idev->dev; 909 struct ipvl_dev *ipvlan = netdev_priv(dev); 910 911 if (!ipvlan_is_valid_dev(dev)) 912 return NOTIFY_DONE; 913 914 switch (event) { 915 case NETDEV_UP: 916 if (ipvlan_add_addr6(ipvlan, &if6->addr)) 917 return NOTIFY_BAD; 918 break; 919 920 case NETDEV_DOWN: 921 ipvlan_del_addr6(ipvlan, &if6->addr); 922 break; 923 } 924 925 return NOTIFY_OK; 926 } 927 928 static int ipvlan_addr6_validator_event(struct notifier_block *unused, 929 unsigned long event, void *ptr) 930 { 931 struct in6_validator_info *i6vi = (struct in6_validator_info *)ptr; 932 struct net_device *dev = (struct net_device *)i6vi->i6vi_dev->dev; 933 struct ipvl_dev *ipvlan = netdev_priv(dev); 934 int ret = NOTIFY_OK; 935 936 if (!ipvlan_is_valid_dev(dev)) 937 return NOTIFY_DONE; 938 939 switch (event) { 940 case NETDEV_UP: 941 spin_lock_bh(&ipvlan->port->addrs_lock); 942 if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) { 943 NL_SET_ERR_MSG(i6vi->extack, 944 "Address already assigned to an ipvlan device"); 945 ret = notifier_from_errno(-EADDRINUSE); 946 } 947 spin_unlock_bh(&ipvlan->port->addrs_lock); 948 break; 949 } 950 951 return ret; 952 } 953 #endif 954 955 static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 956 { 957 int ret = -EINVAL; 958 959 spin_lock_bh(&ipvlan->port->addrs_lock); 960 if (ipvlan_addr_busy(ipvlan->port, ip4_addr, false)) 961 netif_err(ipvlan, ifup, ipvlan->dev, 962 "Failed to add IPv4=%pI4 on %s intf.\n", 963 ip4_addr, ipvlan->dev->name); 964 else 965 ret = ipvlan_add_addr(ipvlan, ip4_addr, false); 966 spin_unlock_bh(&ipvlan->port->addrs_lock); 967 return ret; 968 } 969 970 static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr) 971 { 972 return ipvlan_del_addr(ipvlan, ip4_addr, false); 973 } 974 975 static int ipvlan_addr4_event(struct notifier_block *unused, 976 unsigned long event, void *ptr) 977 { 978 struct in_ifaddr *if4 = (struct in_ifaddr *)ptr; 979 struct net_device *dev = (struct net_device *)if4->ifa_dev->dev; 980 struct ipvl_dev *ipvlan = netdev_priv(dev); 981 struct in_addr ip4_addr; 982 983 if (!ipvlan_is_valid_dev(dev)) 984 return NOTIFY_DONE; 985 986 switch (event) { 987 case NETDEV_UP: 988 ip4_addr.s_addr = if4->ifa_address; 989 if (ipvlan_add_addr4(ipvlan, &ip4_addr)) 990 return NOTIFY_BAD; 991 break; 992 993 case NETDEV_DOWN: 994 ip4_addr.s_addr = if4->ifa_address; 995 ipvlan_del_addr4(ipvlan, &ip4_addr); 996 break; 997 } 998 999 return NOTIFY_OK; 1000 } 1001 1002 static int ipvlan_addr4_validator_event(struct notifier_block *unused, 1003 unsigned long event, void *ptr) 1004 { 1005 struct in_validator_info *ivi = (struct in_validator_info *)ptr; 1006 struct net_device *dev = (struct net_device *)ivi->ivi_dev->dev; 1007 struct ipvl_dev *ipvlan = netdev_priv(dev); 1008 int ret = NOTIFY_OK; 1009 1010 if (!ipvlan_is_valid_dev(dev)) 1011 return NOTIFY_DONE; 1012 1013 switch (event) { 1014 case NETDEV_UP: 1015 spin_lock_bh(&ipvlan->port->addrs_lock); 1016 if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) { 1017 NL_SET_ERR_MSG(ivi->extack, 1018 "Address already assigned to an ipvlan device"); 1019 ret = notifier_from_errno(-EADDRINUSE); 1020 } 1021 spin_unlock_bh(&ipvlan->port->addrs_lock); 1022 break; 1023 } 1024 1025 return ret; 1026 } 1027 1028 static struct notifier_block ipvlan_addr4_notifier_block __read_mostly = { 1029 .notifier_call = ipvlan_addr4_event, 1030 }; 1031 1032 static struct notifier_block ipvlan_addr4_vtor_notifier_block __read_mostly = { 1033 .notifier_call = ipvlan_addr4_validator_event, 1034 }; 1035 1036 static struct notifier_block ipvlan_notifier_block __read_mostly = { 1037 .notifier_call = ipvlan_device_event, 1038 }; 1039 1040 #if IS_ENABLED(CONFIG_IPV6) 1041 static struct notifier_block ipvlan_addr6_notifier_block __read_mostly = { 1042 .notifier_call = ipvlan_addr6_event, 1043 }; 1044 1045 static struct notifier_block ipvlan_addr6_vtor_notifier_block __read_mostly = { 1046 .notifier_call = ipvlan_addr6_validator_event, 1047 }; 1048 #endif 1049 1050 static int __init ipvlan_init_module(void) 1051 { 1052 int err; 1053 1054 ipvlan_init_secret(); 1055 register_netdevice_notifier(&ipvlan_notifier_block); 1056 #if IS_ENABLED(CONFIG_IPV6) 1057 register_inet6addr_notifier(&ipvlan_addr6_notifier_block); 1058 register_inet6addr_validator_notifier( 1059 &ipvlan_addr6_vtor_notifier_block); 1060 #endif 1061 register_inetaddr_notifier(&ipvlan_addr4_notifier_block); 1062 register_inetaddr_validator_notifier(&ipvlan_addr4_vtor_notifier_block); 1063 1064 err = ipvlan_l3s_init(); 1065 if (err < 0) 1066 goto error; 1067 1068 err = ipvlan_link_register(&ipvlan_link_ops); 1069 if (err < 0) { 1070 ipvlan_l3s_cleanup(); 1071 goto error; 1072 } 1073 1074 return 0; 1075 error: 1076 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block); 1077 unregister_inetaddr_validator_notifier( 1078 &ipvlan_addr4_vtor_notifier_block); 1079 #if IS_ENABLED(CONFIG_IPV6) 1080 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block); 1081 unregister_inet6addr_validator_notifier( 1082 &ipvlan_addr6_vtor_notifier_block); 1083 #endif 1084 unregister_netdevice_notifier(&ipvlan_notifier_block); 1085 return err; 1086 } 1087 1088 static void __exit ipvlan_cleanup_module(void) 1089 { 1090 rtnl_link_unregister(&ipvlan_link_ops); 1091 ipvlan_l3s_cleanup(); 1092 unregister_netdevice_notifier(&ipvlan_notifier_block); 1093 unregister_inetaddr_notifier(&ipvlan_addr4_notifier_block); 1094 unregister_inetaddr_validator_notifier( 1095 &ipvlan_addr4_vtor_notifier_block); 1096 #if IS_ENABLED(CONFIG_IPV6) 1097 unregister_inet6addr_notifier(&ipvlan_addr6_notifier_block); 1098 unregister_inet6addr_validator_notifier( 1099 &ipvlan_addr6_vtor_notifier_block); 1100 #endif 1101 } 1102 1103 module_init(ipvlan_init_module); 1104 module_exit(ipvlan_cleanup_module); 1105 1106 MODULE_LICENSE("GPL"); 1107 MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>"); 1108 MODULE_DESCRIPTION("Driver for L3 (IPv6/IPv4) based VLANs"); 1109 MODULE_ALIAS_RTNL_LINK("ipvlan"); 1110 MODULE_IMPORT_NS("NETDEV_INTERNAL"); 1111