1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* -*- linux-c -*- 3 * INET 802.1Q VLAN 4 * Ethernet-type device handling. 5 * 6 * Authors: Ben Greear <greearb@candelatech.com> 7 * Please send support related email to: netdev@vger.kernel.org 8 * VLAN Home Page: http://www.candelatech.com/~greear/vlan.html 9 * 10 * Fixes: Mar 22 2001: Martin Bokaemper <mbokaemper@unispherenetworks.com> 11 * - reset skb->pkt_type on incoming packets when MAC was changed 12 * - see that changed MAC is saddr for outgoing packets 13 * Oct 20, 2001: Ard van Breeman: 14 * - Fix MC-list, finally. 15 * - Flush MC-list on VLAN destroy. 16 */ 17 18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 19 20 #include <linux/module.h> 21 #include <linux/slab.h> 22 #include <linux/skbuff.h> 23 #include <linux/netdevice.h> 24 #include <linux/net_tstamp.h> 25 #include <linux/etherdevice.h> 26 #include <linux/ethtool.h> 27 #include <linux/phy.h> 28 #include <net/arp.h> 29 #include <net/macsec.h> 30 #include <net/netdev_lock.h> 31 32 #include "vlan.h" 33 #include "vlanproc.h" 34 #include <linux/if_vlan.h> 35 #include <linux/netpoll.h> 36 37 /* 38 * Create the VLAN header for an arbitrary protocol layer 39 * 40 * saddr=NULL means use device source address 41 * daddr=NULL means leave destination address (eg unresolved arp) 42 * 43 * This is called when the SKB is moving down the stack towards the 44 * physical devices. 45 */ 46 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev, 47 unsigned short type, 48 const void *daddr, const void *saddr, 49 unsigned int len) 50 { 51 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 52 struct vlan_hdr *vhdr; 53 unsigned int vhdrlen = 0; 54 u16 vlan_tci = 0; 55 int rc; 56 57 if (!(vlan->flags & VLAN_FLAG_REORDER_HDR)) { 58 vhdr = skb_push(skb, VLAN_HLEN); 59 60 vlan_tci = vlan->vlan_id; 61 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority); 62 vhdr->h_vlan_TCI = htons(vlan_tci); 63 64 /* 65 * Set the protocol type. For a packet of type ETH_P_802_3/2 we 66 * put the length in here instead. 67 */ 68 if (type != ETH_P_802_3 && type != ETH_P_802_2) 69 vhdr->h_vlan_encapsulated_proto = htons(type); 70 else 71 vhdr->h_vlan_encapsulated_proto = htons(len); 72 73 skb->protocol = vlan->vlan_proto; 74 type = ntohs(vlan->vlan_proto); 75 vhdrlen = VLAN_HLEN; 76 } 77 78 /* Before delegating work to the lower layer, enter our MAC-address */ 79 if (saddr == NULL) 80 saddr = dev->dev_addr; 81 82 /* Now make the underlying real hard header */ 83 dev = vlan->real_dev; 84 rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen); 85 if (rc > 0) 86 rc += vhdrlen; 87 return rc; 88 } 89 90 static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb) 91 { 92 #ifdef CONFIG_NET_POLL_CONTROLLER 93 return netpoll_send_skb(vlan->netpoll, skb); 94 #else 95 BUG(); 96 return NETDEV_TX_OK; 97 #endif 98 } 99 100 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb, 101 struct net_device *dev) 102 { 103 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 104 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data); 105 unsigned int len; 106 int ret; 107 108 /* Handle non-VLAN frames if they are sent to us, for example by DHCP. 109 * 110 * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING 111 * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs... 112 */ 113 if (vlan->flags & VLAN_FLAG_REORDER_HDR || 114 veth->h_vlan_proto != vlan->vlan_proto) { 115 u16 vlan_tci; 116 vlan_tci = vlan->vlan_id; 117 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority); 118 __vlan_hwaccel_put_tag(skb, vlan->vlan_proto, vlan_tci); 119 } 120 121 skb->dev = vlan->real_dev; 122 len = skb->len; 123 if (unlikely(netpoll_tx_running(dev))) 124 return vlan_netpoll_send_skb(vlan, skb); 125 126 ret = dev_queue_xmit(skb); 127 128 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 129 struct vlan_pcpu_stats *stats; 130 131 stats = this_cpu_ptr(vlan->vlan_pcpu_stats); 132 u64_stats_update_begin(&stats->syncp); 133 u64_stats_inc(&stats->tx_packets); 134 u64_stats_add(&stats->tx_bytes, len); 135 u64_stats_update_end(&stats->syncp); 136 } else { 137 this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped); 138 } 139 140 return ret; 141 } 142 143 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu) 144 { 145 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 146 unsigned int max_mtu = real_dev->mtu; 147 148 if (netif_reduces_vlan_mtu(real_dev)) 149 max_mtu -= VLAN_HLEN; 150 if (max_mtu < new_mtu) 151 return -ERANGE; 152 153 WRITE_ONCE(dev->mtu, new_mtu); 154 155 return 0; 156 } 157 158 void vlan_dev_set_ingress_priority(const struct net_device *dev, 159 u32 skb_prio, u16 vlan_prio) 160 { 161 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 162 163 if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio) 164 vlan->nr_ingress_mappings--; 165 else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio) 166 vlan->nr_ingress_mappings++; 167 168 vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio; 169 } 170 171 int vlan_dev_set_egress_priority(const struct net_device *dev, 172 u32 skb_prio, u16 vlan_prio) 173 { 174 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 175 struct vlan_priority_tci_mapping __rcu **mpp; 176 struct vlan_priority_tci_mapping *mp; 177 struct vlan_priority_tci_mapping *np; 178 u32 bucket = skb_prio & 0xF; 179 u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK; 180 181 /* See if a priority mapping exists.. */ 182 mpp = &vlan->egress_priority_map[bucket]; 183 mp = rtnl_dereference(*mpp); 184 while (mp) { 185 if (mp->priority == skb_prio) { 186 if (!vlan_qos) { 187 rcu_assign_pointer(*mpp, rtnl_dereference(mp->next)); 188 vlan->nr_egress_mappings--; 189 kfree_rcu(mp, rcu); 190 } else { 191 WRITE_ONCE(mp->vlan_qos, vlan_qos); 192 } 193 return 0; 194 } 195 mpp = &mp->next; 196 mp = rtnl_dereference(*mpp); 197 } 198 199 /* Create a new mapping then. */ 200 if (!vlan_qos) 201 return 0; 202 203 np = kmalloc_obj(struct vlan_priority_tci_mapping); 204 if (!np) 205 return -ENOBUFS; 206 207 np->priority = skb_prio; 208 np->vlan_qos = vlan_qos; 209 RCU_INIT_POINTER(np->next, rtnl_dereference(vlan->egress_priority_map[bucket])); 210 rcu_assign_pointer(vlan->egress_priority_map[bucket], np); 211 if (vlan_qos) 212 vlan->nr_egress_mappings++; 213 return 0; 214 } 215 216 /* Flags are defined in the vlan_flags enum in 217 * include/uapi/linux/if_vlan.h file. 218 */ 219 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask) 220 { 221 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 222 u32 old_flags = vlan->flags; 223 224 if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP | 225 VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP | 226 VLAN_FLAG_BRIDGE_BINDING)) 227 return -EINVAL; 228 229 vlan->flags = (old_flags & ~mask) | (flags & mask); 230 231 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) { 232 if (vlan->flags & VLAN_FLAG_GVRP) 233 vlan_gvrp_request_join(dev); 234 else 235 vlan_gvrp_request_leave(dev); 236 } 237 238 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) { 239 if (vlan->flags & VLAN_FLAG_MVRP) 240 vlan_mvrp_request_join(dev); 241 else 242 vlan_mvrp_request_leave(dev); 243 } 244 return 0; 245 } 246 247 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result, size_t size) 248 { 249 strscpy_pad(result, vlan_dev_priv(dev)->real_dev->name, size); 250 } 251 252 bool vlan_dev_inherit_address(struct net_device *dev, 253 struct net_device *real_dev) 254 { 255 if (dev->addr_assign_type != NET_ADDR_STOLEN) 256 return false; 257 258 eth_hw_addr_set(dev, real_dev->dev_addr); 259 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 260 return true; 261 } 262 263 static int vlan_dev_open(struct net_device *dev) 264 { 265 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 266 struct net_device *real_dev = vlan->real_dev; 267 int err; 268 269 if (!(real_dev->flags & IFF_UP) && 270 !(vlan->flags & VLAN_FLAG_LOOSE_BINDING)) 271 return -ENETDOWN; 272 273 /* The explicit open supersedes any deferred link-state sync */ 274 netdev_work_cancel(dev, VLAN_WORK_LINK_STATE); 275 276 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr) && 277 !vlan_dev_inherit_address(dev, real_dev)) { 278 err = dev_uc_add(real_dev, dev->dev_addr); 279 if (err < 0) 280 goto out; 281 } 282 283 ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr); 284 285 if (vlan->flags & VLAN_FLAG_GVRP) 286 vlan_gvrp_request_join(dev); 287 288 if (vlan->flags & VLAN_FLAG_MVRP) 289 vlan_mvrp_request_join(dev); 290 291 if (netif_carrier_ok(real_dev) && 292 !(vlan->flags & VLAN_FLAG_BRIDGE_BINDING)) 293 netif_carrier_on(dev); 294 return 0; 295 296 out: 297 netif_carrier_off(dev); 298 return err; 299 } 300 301 static int vlan_dev_stop(struct net_device *dev) 302 { 303 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 304 struct net_device *real_dev = vlan->real_dev; 305 306 /* The explicit close supersedes any deferred link-state sync */ 307 netdev_work_cancel(dev, VLAN_WORK_LINK_STATE); 308 309 dev_mc_unsync(real_dev, dev); 310 dev_uc_unsync(real_dev, dev); 311 312 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) 313 dev_uc_del(real_dev, dev->dev_addr); 314 315 if (!(vlan->flags & VLAN_FLAG_BRIDGE_BINDING)) 316 netif_carrier_off(dev); 317 return 0; 318 } 319 320 static int vlan_dev_set_mac_address(struct net_device *dev, void *p) 321 { 322 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 323 struct sockaddr *addr = p; 324 int err; 325 326 if (!is_valid_ether_addr(addr->sa_data)) 327 return -EADDRNOTAVAIL; 328 329 if (!(dev->flags & IFF_UP)) 330 goto out; 331 332 if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) { 333 err = dev_uc_add(real_dev, addr->sa_data); 334 if (err < 0) 335 return err; 336 } 337 338 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) 339 dev_uc_del(real_dev, dev->dev_addr); 340 341 out: 342 eth_hw_addr_set(dev, addr->sa_data); 343 return 0; 344 } 345 346 static int vlan_hwtstamp_get(struct net_device *dev, 347 struct kernel_hwtstamp_config *cfg) 348 { 349 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 350 351 return generic_hwtstamp_get_lower(real_dev, cfg); 352 } 353 354 static int vlan_hwtstamp_set(struct net_device *dev, 355 struct kernel_hwtstamp_config *cfg, 356 struct netlink_ext_ack *extack) 357 { 358 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 359 360 if (!net_eq(dev_net(dev), dev_net(real_dev))) 361 return -EOPNOTSUPP; 362 363 return generic_hwtstamp_set_lower(real_dev, cfg, extack); 364 } 365 366 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 367 { 368 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 369 struct ifreq ifrr; 370 int err = -EOPNOTSUPP; 371 372 strscpy_pad(ifrr.ifr_name, real_dev->name, IFNAMSIZ); 373 ifrr.ifr_ifru = ifr->ifr_ifru; 374 375 switch (cmd) { 376 case SIOCGMIIPHY: 377 case SIOCGMIIREG: 378 case SIOCSMIIREG: 379 err = dev_eth_ioctl(real_dev, &ifrr, cmd); 380 break; 381 } 382 383 if (!err) 384 ifr->ifr_ifru = ifrr.ifr_ifru; 385 386 return err; 387 } 388 389 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa) 390 { 391 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 392 const struct net_device_ops *ops = real_dev->netdev_ops; 393 int err = 0; 394 395 if (netif_device_present(real_dev) && ops->ndo_neigh_setup) 396 err = ops->ndo_neigh_setup(real_dev, pa); 397 398 return err; 399 } 400 401 #if IS_ENABLED(CONFIG_FCOE) 402 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid, 403 struct scatterlist *sgl, unsigned int sgc) 404 { 405 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 406 const struct net_device_ops *ops = real_dev->netdev_ops; 407 int rc = 0; 408 409 if (ops->ndo_fcoe_ddp_setup) 410 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc); 411 412 return rc; 413 } 414 415 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid) 416 { 417 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 418 const struct net_device_ops *ops = real_dev->netdev_ops; 419 int len = 0; 420 421 if (ops->ndo_fcoe_ddp_done) 422 len = ops->ndo_fcoe_ddp_done(real_dev, xid); 423 424 return len; 425 } 426 427 static int vlan_dev_fcoe_enable(struct net_device *dev) 428 { 429 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 430 const struct net_device_ops *ops = real_dev->netdev_ops; 431 int rc = -EINVAL; 432 433 if (ops->ndo_fcoe_enable) 434 rc = ops->ndo_fcoe_enable(real_dev); 435 return rc; 436 } 437 438 static int vlan_dev_fcoe_disable(struct net_device *dev) 439 { 440 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 441 const struct net_device_ops *ops = real_dev->netdev_ops; 442 int rc = -EINVAL; 443 444 if (ops->ndo_fcoe_disable) 445 rc = ops->ndo_fcoe_disable(real_dev); 446 return rc; 447 } 448 449 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid, 450 struct scatterlist *sgl, unsigned int sgc) 451 { 452 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 453 const struct net_device_ops *ops = real_dev->netdev_ops; 454 int rc = 0; 455 456 if (ops->ndo_fcoe_ddp_target) 457 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc); 458 459 return rc; 460 } 461 #endif 462 463 #ifdef NETDEV_FCOE_WWNN 464 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type) 465 { 466 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 467 const struct net_device_ops *ops = real_dev->netdev_ops; 468 int rc = -EINVAL; 469 470 if (ops->ndo_fcoe_get_wwn) 471 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type); 472 return rc; 473 } 474 #endif 475 476 static void vlan_dev_change_rx_flags(struct net_device *dev, int change) 477 { 478 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 479 480 if (change & IFF_ALLMULTI) 481 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 482 if (change & IFF_PROMISC) 483 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1); 484 } 485 486 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev) 487 { 488 dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev); 489 dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev); 490 } 491 492 static __be16 vlan_parse_protocol(const struct sk_buff *skb) 493 { 494 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data); 495 496 return __vlan_get_protocol(skb, veth->h_vlan_proto, NULL); 497 } 498 499 static const struct header_ops vlan_header_ops = { 500 .create = vlan_dev_hard_header, 501 .parse = eth_header_parse, 502 .parse_protocol = vlan_parse_protocol, 503 }; 504 505 static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev, 506 unsigned short type, 507 const void *daddr, const void *saddr, 508 unsigned int len) 509 { 510 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 511 struct net_device *real_dev = vlan->real_dev; 512 513 if (saddr == NULL) 514 saddr = dev->dev_addr; 515 516 return dev_hard_header(skb, real_dev, type, daddr, saddr, len); 517 } 518 519 static const struct header_ops vlan_passthru_header_ops = { 520 .create = vlan_passthru_hard_header, 521 .parse = eth_header_parse, 522 .parse_protocol = vlan_parse_protocol, 523 }; 524 525 static const struct device_type vlan_type = { 526 .name = "vlan", 527 }; 528 529 static const struct net_device_ops vlan_netdev_ops; 530 531 static int vlan_dev_init(struct net_device *dev) 532 { 533 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 534 struct net_device *real_dev = vlan->real_dev; 535 536 netif_carrier_off(dev); 537 538 /* IFF_BROADCAST|IFF_MULTICAST; ??? */ 539 dev->flags = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | 540 IFF_MASTER | IFF_SLAVE); 541 dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) | 542 (1<<__LINK_STATE_DORMANT))) | 543 (1<<__LINK_STATE_PRESENT); 544 545 if (vlan->flags & VLAN_FLAG_BRIDGE_BINDING) 546 dev->state |= (1 << __LINK_STATE_NOCARRIER); 547 548 dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG | 549 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE | 550 NETIF_F_GSO_ENCAP_ALL | 551 NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC | 552 NETIF_F_FCOE_CRC | NETIF_F_FSO; 553 554 if (real_dev->vlan_features & NETIF_F_HW_MACSEC) 555 dev->hw_features |= NETIF_F_HW_MACSEC; 556 557 dev->features |= dev->hw_features; 558 dev->lltx = true; 559 dev->fcoe_mtu = true; 560 netif_inherit_tso_max(dev, real_dev); 561 if (dev->features & NETIF_F_VLAN_FEATURES) 562 netdev_warn(real_dev, "VLAN features are set incorrectly. Q-in-Q configurations may not work correctly.\n"); 563 564 dev->vlan_features = real_dev->vlan_features & 565 ~(NETIF_F_FCOE_CRC | NETIF_F_FSO); 566 dev->hw_enc_features = vlan_tnl_features(real_dev); 567 dev->mpls_features = real_dev->mpls_features; 568 569 /* ipv6 shared card related stuff */ 570 dev->dev_id = real_dev->dev_id; 571 572 if (is_zero_ether_addr(dev->dev_addr)) { 573 eth_hw_addr_set(dev, real_dev->dev_addr); 574 dev->addr_assign_type = NET_ADDR_STOLEN; 575 } 576 if (is_zero_ether_addr(dev->broadcast)) 577 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 578 579 #if IS_ENABLED(CONFIG_FCOE) 580 dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid; 581 #endif 582 583 dev->needed_headroom = real_dev->needed_headroom; 584 if (vlan_hw_offload_capable(real_dev->features, vlan->vlan_proto)) { 585 dev->header_ops = &vlan_passthru_header_ops; 586 dev->hard_header_len = real_dev->hard_header_len; 587 } else { 588 dev->header_ops = &vlan_header_ops; 589 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN; 590 } 591 592 dev->netdev_ops = &vlan_netdev_ops; 593 594 SET_NETDEV_DEVTYPE(dev, &vlan_type); 595 596 netdev_lockdep_set_classes(dev); 597 598 vlan->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats); 599 if (!vlan->vlan_pcpu_stats) 600 return -ENOMEM; 601 602 /* Get vlan's reference to real_dev */ 603 netdev_hold(real_dev, &vlan->dev_tracker, GFP_KERNEL); 604 605 return 0; 606 } 607 608 /* Note: this function might be called multiple times for the same device. */ 609 void vlan_dev_free_egress_priority(const struct net_device *dev) 610 { 611 struct vlan_priority_tci_mapping *pm; 612 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 613 int i; 614 615 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { 616 pm = rtnl_dereference(vlan->egress_priority_map[i]); 617 RCU_INIT_POINTER(vlan->egress_priority_map[i], NULL); 618 while (pm) { 619 struct vlan_priority_tci_mapping *next; 620 621 next = rtnl_dereference(pm->next); 622 kfree_rcu(pm, rcu); 623 pm = next; 624 } 625 } 626 vlan->nr_egress_mappings = 0; 627 } 628 629 static void vlan_dev_uninit(struct net_device *dev) 630 { 631 vlan_dev_free_egress_priority(dev); 632 } 633 634 static netdev_features_t vlan_dev_fix_features(struct net_device *dev, 635 netdev_features_t features) 636 { 637 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 638 netdev_features_t old_features = features; 639 netdev_features_t lower_features; 640 641 lower_features = netdev_intersect_features((real_dev->vlan_features | 642 NETIF_F_RXCSUM), 643 real_dev->features); 644 645 /* Add HW_CSUM setting to preserve user ability to control 646 * checksum offload on the vlan device. 647 */ 648 if (lower_features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM)) 649 lower_features |= NETIF_F_HW_CSUM; 650 features = netdev_intersect_features(features, lower_features); 651 features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE); 652 653 return features; 654 } 655 656 static int vlan_ethtool_get_link_ksettings(struct net_device *dev, 657 struct ethtool_link_ksettings *cmd) 658 { 659 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 660 661 return __ethtool_get_link_ksettings(vlan->real_dev, cmd); 662 } 663 664 static void vlan_ethtool_get_drvinfo(struct net_device *dev, 665 struct ethtool_drvinfo *info) 666 { 667 strscpy(info->driver, vlan_fullname, sizeof(info->driver)); 668 strscpy(info->version, vlan_version, sizeof(info->version)); 669 strscpy(info->fw_version, "N/A", sizeof(info->fw_version)); 670 } 671 672 static int vlan_ethtool_get_ts_info(struct net_device *dev, 673 struct kernel_ethtool_ts_info *info) 674 { 675 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 676 return ethtool_get_ts_info_by_layer(vlan->real_dev, info); 677 } 678 679 static void vlan_dev_get_stats64(struct net_device *dev, 680 struct rtnl_link_stats64 *stats) 681 { 682 struct vlan_pcpu_stats *p; 683 u32 rx_errors = 0, tx_dropped = 0; 684 int i; 685 686 for_each_possible_cpu(i) { 687 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes; 688 unsigned int start; 689 690 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i); 691 do { 692 start = u64_stats_fetch_begin(&p->syncp); 693 rxpackets = u64_stats_read(&p->rx_packets); 694 rxbytes = u64_stats_read(&p->rx_bytes); 695 rxmulticast = u64_stats_read(&p->rx_multicast); 696 txpackets = u64_stats_read(&p->tx_packets); 697 txbytes = u64_stats_read(&p->tx_bytes); 698 } while (u64_stats_fetch_retry(&p->syncp, start)); 699 700 stats->rx_packets += rxpackets; 701 stats->rx_bytes += rxbytes; 702 stats->multicast += rxmulticast; 703 stats->tx_packets += txpackets; 704 stats->tx_bytes += txbytes; 705 /* rx_errors & tx_dropped are u32 */ 706 rx_errors += READ_ONCE(p->rx_errors); 707 tx_dropped += READ_ONCE(p->tx_dropped); 708 } 709 stats->rx_errors = rx_errors; 710 stats->tx_dropped = tx_dropped; 711 } 712 713 #ifdef CONFIG_NET_POLL_CONTROLLER 714 static void vlan_dev_poll_controller(struct net_device *dev) 715 { 716 return; 717 } 718 719 static int vlan_dev_netpoll_setup(struct net_device *dev) 720 { 721 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 722 struct net_device *real_dev = vlan->real_dev; 723 struct netpoll *netpoll; 724 int err = 0; 725 726 netpoll = kzalloc_obj(*netpoll); 727 err = -ENOMEM; 728 if (!netpoll) 729 goto out; 730 731 err = __netpoll_setup(netpoll, real_dev); 732 if (err) { 733 kfree(netpoll); 734 goto out; 735 } 736 737 vlan->netpoll = netpoll; 738 739 out: 740 return err; 741 } 742 743 static void vlan_dev_netpoll_cleanup(struct net_device *dev) 744 { 745 struct vlan_dev_priv *vlan= vlan_dev_priv(dev); 746 struct netpoll *netpoll = vlan->netpoll; 747 748 if (!netpoll) 749 return; 750 751 vlan->netpoll = NULL; 752 __netpoll_free(netpoll); 753 } 754 #endif /* CONFIG_NET_POLL_CONTROLLER */ 755 756 static int vlan_dev_get_iflink(const struct net_device *dev) 757 { 758 const struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 759 760 return READ_ONCE(real_dev->ifindex); 761 } 762 763 static int vlan_dev_fill_forward_path(struct net_device_path_ctx *ctx, 764 struct net_device_path *path) 765 { 766 struct vlan_dev_priv *vlan = vlan_dev_priv(ctx->dev); 767 768 path->type = DEV_PATH_VLAN; 769 path->encap.id = vlan->vlan_id; 770 path->encap.proto = vlan->vlan_proto; 771 path->dev = ctx->dev; 772 ctx->dev = vlan->real_dev; 773 if (ctx->num_vlans >= ARRAY_SIZE(ctx->vlan)) 774 return -ENOSPC; 775 776 ctx->vlan[ctx->num_vlans].id = vlan->vlan_id; 777 ctx->vlan[ctx->num_vlans].proto = vlan->vlan_proto; 778 ctx->num_vlans++; 779 780 return 0; 781 } 782 783 #if IS_ENABLED(CONFIG_MACSEC) 784 785 static const struct macsec_ops *vlan_get_macsec_ops(const struct macsec_context *ctx) 786 { 787 return vlan_dev_priv(ctx->netdev)->real_dev->macsec_ops; 788 } 789 790 static int vlan_macsec_offload(int (* const func)(struct macsec_context *), 791 struct macsec_context *ctx) 792 { 793 if (unlikely(!func)) 794 return 0; 795 796 return (*func)(ctx); 797 } 798 799 static int vlan_macsec_dev_open(struct macsec_context *ctx) 800 { 801 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 802 803 if (!ops) 804 return -EOPNOTSUPP; 805 806 return vlan_macsec_offload(ops->mdo_dev_open, ctx); 807 } 808 809 static int vlan_macsec_dev_stop(struct macsec_context *ctx) 810 { 811 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 812 813 if (!ops) 814 return -EOPNOTSUPP; 815 816 return vlan_macsec_offload(ops->mdo_dev_stop, ctx); 817 } 818 819 static int vlan_macsec_add_secy(struct macsec_context *ctx) 820 { 821 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 822 823 if (!ops) 824 return -EOPNOTSUPP; 825 826 return vlan_macsec_offload(ops->mdo_add_secy, ctx); 827 } 828 829 static int vlan_macsec_upd_secy(struct macsec_context *ctx) 830 { 831 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 832 833 if (!ops) 834 return -EOPNOTSUPP; 835 836 return vlan_macsec_offload(ops->mdo_upd_secy, ctx); 837 } 838 839 static int vlan_macsec_del_secy(struct macsec_context *ctx) 840 { 841 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 842 843 if (!ops) 844 return -EOPNOTSUPP; 845 846 return vlan_macsec_offload(ops->mdo_del_secy, ctx); 847 } 848 849 static int vlan_macsec_add_rxsc(struct macsec_context *ctx) 850 { 851 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 852 853 if (!ops) 854 return -EOPNOTSUPP; 855 856 return vlan_macsec_offload(ops->mdo_add_rxsc, ctx); 857 } 858 859 static int vlan_macsec_upd_rxsc(struct macsec_context *ctx) 860 { 861 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 862 863 if (!ops) 864 return -EOPNOTSUPP; 865 866 return vlan_macsec_offload(ops->mdo_upd_rxsc, ctx); 867 } 868 869 static int vlan_macsec_del_rxsc(struct macsec_context *ctx) 870 { 871 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 872 873 if (!ops) 874 return -EOPNOTSUPP; 875 876 return vlan_macsec_offload(ops->mdo_del_rxsc, ctx); 877 } 878 879 static int vlan_macsec_add_rxsa(struct macsec_context *ctx) 880 { 881 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 882 883 if (!ops) 884 return -EOPNOTSUPP; 885 886 return vlan_macsec_offload(ops->mdo_add_rxsa, ctx); 887 } 888 889 static int vlan_macsec_upd_rxsa(struct macsec_context *ctx) 890 { 891 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 892 893 if (!ops) 894 return -EOPNOTSUPP; 895 896 return vlan_macsec_offload(ops->mdo_upd_rxsa, ctx); 897 } 898 899 static int vlan_macsec_del_rxsa(struct macsec_context *ctx) 900 { 901 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 902 903 if (!ops) 904 return -EOPNOTSUPP; 905 906 return vlan_macsec_offload(ops->mdo_del_rxsa, ctx); 907 } 908 909 static int vlan_macsec_add_txsa(struct macsec_context *ctx) 910 { 911 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 912 913 if (!ops) 914 return -EOPNOTSUPP; 915 916 return vlan_macsec_offload(ops->mdo_add_txsa, ctx); 917 } 918 919 static int vlan_macsec_upd_txsa(struct macsec_context *ctx) 920 { 921 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 922 923 if (!ops) 924 return -EOPNOTSUPP; 925 926 return vlan_macsec_offload(ops->mdo_upd_txsa, ctx); 927 } 928 929 static int vlan_macsec_del_txsa(struct macsec_context *ctx) 930 { 931 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 932 933 if (!ops) 934 return -EOPNOTSUPP; 935 936 return vlan_macsec_offload(ops->mdo_del_txsa, ctx); 937 } 938 939 static int vlan_macsec_get_dev_stats(struct macsec_context *ctx) 940 { 941 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 942 943 if (!ops) 944 return -EOPNOTSUPP; 945 946 return vlan_macsec_offload(ops->mdo_get_dev_stats, ctx); 947 } 948 949 static int vlan_macsec_get_tx_sc_stats(struct macsec_context *ctx) 950 { 951 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 952 953 if (!ops) 954 return -EOPNOTSUPP; 955 956 return vlan_macsec_offload(ops->mdo_get_tx_sc_stats, ctx); 957 } 958 959 static int vlan_macsec_get_tx_sa_stats(struct macsec_context *ctx) 960 { 961 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 962 963 if (!ops) 964 return -EOPNOTSUPP; 965 966 return vlan_macsec_offload(ops->mdo_get_tx_sa_stats, ctx); 967 } 968 969 static int vlan_macsec_get_rx_sc_stats(struct macsec_context *ctx) 970 { 971 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 972 973 if (!ops) 974 return -EOPNOTSUPP; 975 976 return vlan_macsec_offload(ops->mdo_get_rx_sc_stats, ctx); 977 } 978 979 static int vlan_macsec_get_rx_sa_stats(struct macsec_context *ctx) 980 { 981 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 982 983 if (!ops) 984 return -EOPNOTSUPP; 985 986 return vlan_macsec_offload(ops->mdo_get_rx_sa_stats, ctx); 987 } 988 989 static const struct macsec_ops macsec_offload_ops = { 990 /* Device wide */ 991 .mdo_dev_open = vlan_macsec_dev_open, 992 .mdo_dev_stop = vlan_macsec_dev_stop, 993 /* SecY */ 994 .mdo_add_secy = vlan_macsec_add_secy, 995 .mdo_upd_secy = vlan_macsec_upd_secy, 996 .mdo_del_secy = vlan_macsec_del_secy, 997 /* Security channels */ 998 .mdo_add_rxsc = vlan_macsec_add_rxsc, 999 .mdo_upd_rxsc = vlan_macsec_upd_rxsc, 1000 .mdo_del_rxsc = vlan_macsec_del_rxsc, 1001 /* Security associations */ 1002 .mdo_add_rxsa = vlan_macsec_add_rxsa, 1003 .mdo_upd_rxsa = vlan_macsec_upd_rxsa, 1004 .mdo_del_rxsa = vlan_macsec_del_rxsa, 1005 .mdo_add_txsa = vlan_macsec_add_txsa, 1006 .mdo_upd_txsa = vlan_macsec_upd_txsa, 1007 .mdo_del_txsa = vlan_macsec_del_txsa, 1008 /* Statistics */ 1009 .mdo_get_dev_stats = vlan_macsec_get_dev_stats, 1010 .mdo_get_tx_sc_stats = vlan_macsec_get_tx_sc_stats, 1011 .mdo_get_tx_sa_stats = vlan_macsec_get_tx_sa_stats, 1012 .mdo_get_rx_sc_stats = vlan_macsec_get_rx_sc_stats, 1013 .mdo_get_rx_sa_stats = vlan_macsec_get_rx_sa_stats, 1014 }; 1015 1016 #endif 1017 1018 static const struct ethtool_ops vlan_ethtool_ops = { 1019 .get_link_ksettings = vlan_ethtool_get_link_ksettings, 1020 .get_drvinfo = vlan_ethtool_get_drvinfo, 1021 .get_link = ethtool_op_get_link, 1022 .get_ts_info = vlan_ethtool_get_ts_info, 1023 }; 1024 1025 static void vlan_transfer_features(struct net_device *dev, 1026 struct net_device *vlandev) 1027 { 1028 struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev); 1029 1030 netif_inherit_tso_max(vlandev, dev); 1031 1032 if (vlan_hw_offload_capable(dev->features, vlan->vlan_proto)) 1033 vlandev->hard_header_len = dev->hard_header_len; 1034 else 1035 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN; 1036 1037 #if IS_ENABLED(CONFIG_FCOE) 1038 vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid; 1039 #endif 1040 1041 vlandev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 1042 vlandev->priv_flags |= (vlan->real_dev->priv_flags & IFF_XMIT_DST_RELEASE); 1043 vlandev->hw_enc_features = vlan_tnl_features(vlan->real_dev); 1044 1045 netdev_update_features(vlandev); 1046 } 1047 1048 static void vlan_dev_work(struct net_device *vlandev, unsigned long events) 1049 { 1050 struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev); 1051 struct net_device *real_dev = vlan->real_dev; 1052 bool loose = vlan->flags & VLAN_FLAG_LOOSE_BINDING; 1053 unsigned int flgs; 1054 1055 if (events & VLAN_WORK_LINK_STATE) { 1056 flgs = netif_get_flags(vlandev); 1057 if (real_dev->flags & IFF_UP) { 1058 if (!(flgs & IFF_UP)) { 1059 if (!loose) 1060 netif_change_flags(vlandev, 1061 flgs | IFF_UP, NULL); 1062 vlan_stacked_transfer_operstate(real_dev, 1063 vlandev, vlan); 1064 } 1065 } else if ((flgs & IFF_UP) && !loose) { 1066 netif_change_flags(vlandev, flgs & ~IFF_UP, NULL); 1067 vlan_stacked_transfer_operstate(real_dev, vlandev, vlan); 1068 } 1069 } 1070 1071 if ((events & VLAN_WORK_MTU) && vlandev->mtu > real_dev->mtu) 1072 netif_set_mtu(vlandev, real_dev->mtu); 1073 1074 if (events & VLAN_WORK_FEATURES) 1075 vlan_transfer_features(real_dev, vlandev); 1076 } 1077 1078 static const struct net_device_ops vlan_netdev_ops = { 1079 .ndo_change_mtu = vlan_dev_change_mtu, 1080 .ndo_init = vlan_dev_init, 1081 .ndo_uninit = vlan_dev_uninit, 1082 .ndo_open = vlan_dev_open, 1083 .ndo_stop = vlan_dev_stop, 1084 .ndo_start_xmit = vlan_dev_hard_start_xmit, 1085 .ndo_validate_addr = eth_validate_addr, 1086 .ndo_set_mac_address = vlan_dev_set_mac_address, 1087 .ndo_set_rx_mode = vlan_dev_set_rx_mode, 1088 .ndo_change_rx_flags = vlan_dev_change_rx_flags, 1089 .ndo_work = vlan_dev_work, 1090 .ndo_eth_ioctl = vlan_dev_ioctl, 1091 .ndo_neigh_setup = vlan_dev_neigh_setup, 1092 .ndo_get_stats64 = vlan_dev_get_stats64, 1093 #if IS_ENABLED(CONFIG_FCOE) 1094 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup, 1095 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done, 1096 .ndo_fcoe_enable = vlan_dev_fcoe_enable, 1097 .ndo_fcoe_disable = vlan_dev_fcoe_disable, 1098 .ndo_fcoe_ddp_target = vlan_dev_fcoe_ddp_target, 1099 #endif 1100 #ifdef NETDEV_FCOE_WWNN 1101 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn, 1102 #endif 1103 #ifdef CONFIG_NET_POLL_CONTROLLER 1104 .ndo_poll_controller = vlan_dev_poll_controller, 1105 .ndo_netpoll_setup = vlan_dev_netpoll_setup, 1106 .ndo_netpoll_cleanup = vlan_dev_netpoll_cleanup, 1107 #endif 1108 .ndo_fix_features = vlan_dev_fix_features, 1109 .ndo_get_iflink = vlan_dev_get_iflink, 1110 .ndo_fill_forward_path = vlan_dev_fill_forward_path, 1111 .ndo_hwtstamp_get = vlan_hwtstamp_get, 1112 .ndo_hwtstamp_set = vlan_hwtstamp_set, 1113 }; 1114 1115 static void vlan_dev_free(struct net_device *dev) 1116 { 1117 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 1118 1119 free_percpu(vlan->vlan_pcpu_stats); 1120 vlan->vlan_pcpu_stats = NULL; 1121 1122 /* Get rid of the vlan's reference to real_dev */ 1123 netdev_put(vlan->real_dev, &vlan->dev_tracker); 1124 } 1125 1126 void vlan_setup(struct net_device *dev) 1127 { 1128 ether_setup(dev); 1129 1130 dev->priv_flags |= IFF_802_1Q_VLAN | IFF_NO_QUEUE; 1131 dev->priv_flags |= IFF_UNICAST_FLT; 1132 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1133 netif_keep_dst(dev); 1134 1135 dev->netdev_ops = &vlan_netdev_ops; 1136 dev->needs_free_netdev = true; 1137 dev->priv_destructor = vlan_dev_free; 1138 dev->ethtool_ops = &vlan_ethtool_ops; 1139 1140 #if IS_ENABLED(CONFIG_MACSEC) 1141 dev->macsec_ops = &macsec_offload_ops; 1142 #endif 1143 dev->min_mtu = 0; 1144 dev->max_mtu = ETH_MAX_MTU; 1145 1146 eth_zero_addr(dev->broadcast); 1147 } 1148