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 30 #include "vlan.h" 31 #include "vlanproc.h" 32 #include <linux/if_vlan.h> 33 #include <linux/netpoll.h> 34 35 /* 36 * Create the VLAN header for an arbitrary protocol layer 37 * 38 * saddr=NULL means use device source address 39 * daddr=NULL means leave destination address (eg unresolved arp) 40 * 41 * This is called when the SKB is moving down the stack towards the 42 * physical devices. 43 */ 44 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev, 45 unsigned short type, 46 const void *daddr, const void *saddr, 47 unsigned int len) 48 { 49 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 50 struct vlan_hdr *vhdr; 51 unsigned int vhdrlen = 0; 52 u16 vlan_tci = 0; 53 int rc; 54 55 if (!(vlan->flags & VLAN_FLAG_REORDER_HDR)) { 56 vhdr = skb_push(skb, VLAN_HLEN); 57 58 vlan_tci = vlan->vlan_id; 59 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority); 60 vhdr->h_vlan_TCI = htons(vlan_tci); 61 62 /* 63 * Set the protocol type. For a packet of type ETH_P_802_3/2 we 64 * put the length in here instead. 65 */ 66 if (type != ETH_P_802_3 && type != ETH_P_802_2) 67 vhdr->h_vlan_encapsulated_proto = htons(type); 68 else 69 vhdr->h_vlan_encapsulated_proto = htons(len); 70 71 skb->protocol = vlan->vlan_proto; 72 type = ntohs(vlan->vlan_proto); 73 vhdrlen = VLAN_HLEN; 74 } 75 76 /* Before delegating work to the lower layer, enter our MAC-address */ 77 if (saddr == NULL) 78 saddr = dev->dev_addr; 79 80 /* Now make the underlying real hard header */ 81 dev = vlan->real_dev; 82 rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen); 83 if (rc > 0) 84 rc += vhdrlen; 85 return rc; 86 } 87 88 static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb) 89 { 90 #ifdef CONFIG_NET_POLL_CONTROLLER 91 return netpoll_send_skb(vlan->netpoll, skb); 92 #else 93 BUG(); 94 return NETDEV_TX_OK; 95 #endif 96 } 97 98 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb, 99 struct net_device *dev) 100 { 101 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 102 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data); 103 unsigned int len; 104 int ret; 105 106 /* Handle non-VLAN frames if they are sent to us, for example by DHCP. 107 * 108 * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING 109 * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs... 110 */ 111 if (veth->h_vlan_proto != vlan->vlan_proto || 112 vlan->flags & VLAN_FLAG_REORDER_HDR) { 113 u16 vlan_tci; 114 vlan_tci = vlan->vlan_id; 115 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority); 116 __vlan_hwaccel_put_tag(skb, vlan->vlan_proto, vlan_tci); 117 } 118 119 skb->dev = vlan->real_dev; 120 len = skb->len; 121 if (unlikely(netpoll_tx_running(dev))) 122 return vlan_netpoll_send_skb(vlan, skb); 123 124 ret = dev_queue_xmit(skb); 125 126 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 127 struct vlan_pcpu_stats *stats; 128 129 stats = this_cpu_ptr(vlan->vlan_pcpu_stats); 130 u64_stats_update_begin(&stats->syncp); 131 u64_stats_inc(&stats->tx_packets); 132 u64_stats_add(&stats->tx_bytes, len); 133 u64_stats_update_end(&stats->syncp); 134 } else { 135 this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped); 136 } 137 138 return ret; 139 } 140 141 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu) 142 { 143 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 144 unsigned int max_mtu = real_dev->mtu; 145 146 if (netif_reduces_vlan_mtu(real_dev)) 147 max_mtu -= VLAN_HLEN; 148 if (max_mtu < new_mtu) 149 return -ERANGE; 150 151 dev->mtu = new_mtu; 152 153 return 0; 154 } 155 156 void vlan_dev_set_ingress_priority(const struct net_device *dev, 157 u32 skb_prio, u16 vlan_prio) 158 { 159 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 160 161 if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio) 162 vlan->nr_ingress_mappings--; 163 else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio) 164 vlan->nr_ingress_mappings++; 165 166 vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio; 167 } 168 169 int vlan_dev_set_egress_priority(const struct net_device *dev, 170 u32 skb_prio, u16 vlan_prio) 171 { 172 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 173 struct vlan_priority_tci_mapping *mp = NULL; 174 struct vlan_priority_tci_mapping *np; 175 u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK; 176 177 /* See if a priority mapping exists.. */ 178 mp = vlan->egress_priority_map[skb_prio & 0xF]; 179 while (mp) { 180 if (mp->priority == skb_prio) { 181 if (mp->vlan_qos && !vlan_qos) 182 vlan->nr_egress_mappings--; 183 else if (!mp->vlan_qos && vlan_qos) 184 vlan->nr_egress_mappings++; 185 mp->vlan_qos = vlan_qos; 186 return 0; 187 } 188 mp = mp->next; 189 } 190 191 /* Create a new mapping then. */ 192 mp = vlan->egress_priority_map[skb_prio & 0xF]; 193 np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL); 194 if (!np) 195 return -ENOBUFS; 196 197 np->next = mp; 198 np->priority = skb_prio; 199 np->vlan_qos = vlan_qos; 200 /* Before inserting this element in hash table, make sure all its fields 201 * are committed to memory. 202 * coupled with smp_rmb() in vlan_dev_get_egress_qos_mask() 203 */ 204 smp_wmb(); 205 vlan->egress_priority_map[skb_prio & 0xF] = np; 206 if (vlan_qos) 207 vlan->nr_egress_mappings++; 208 return 0; 209 } 210 211 /* Flags are defined in the vlan_flags enum in 212 * include/uapi/linux/if_vlan.h file. 213 */ 214 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask) 215 { 216 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 217 u32 old_flags = vlan->flags; 218 219 if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP | 220 VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP | 221 VLAN_FLAG_BRIDGE_BINDING)) 222 return -EINVAL; 223 224 vlan->flags = (old_flags & ~mask) | (flags & mask); 225 226 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) { 227 if (vlan->flags & VLAN_FLAG_GVRP) 228 vlan_gvrp_request_join(dev); 229 else 230 vlan_gvrp_request_leave(dev); 231 } 232 233 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) { 234 if (vlan->flags & VLAN_FLAG_MVRP) 235 vlan_mvrp_request_join(dev); 236 else 237 vlan_mvrp_request_leave(dev); 238 } 239 return 0; 240 } 241 242 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result, size_t size) 243 { 244 strscpy_pad(result, vlan_dev_priv(dev)->real_dev->name, size); 245 } 246 247 bool vlan_dev_inherit_address(struct net_device *dev, 248 struct net_device *real_dev) 249 { 250 if (dev->addr_assign_type != NET_ADDR_STOLEN) 251 return false; 252 253 eth_hw_addr_set(dev, real_dev->dev_addr); 254 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 255 return true; 256 } 257 258 static int vlan_dev_open(struct net_device *dev) 259 { 260 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 261 struct net_device *real_dev = vlan->real_dev; 262 int err; 263 264 if (!(real_dev->flags & IFF_UP) && 265 !(vlan->flags & VLAN_FLAG_LOOSE_BINDING)) 266 return -ENETDOWN; 267 268 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr) && 269 !vlan_dev_inherit_address(dev, real_dev)) { 270 err = dev_uc_add(real_dev, dev->dev_addr); 271 if (err < 0) 272 goto out; 273 } 274 275 if (dev->flags & IFF_ALLMULTI) { 276 err = dev_set_allmulti(real_dev, 1); 277 if (err < 0) 278 goto del_unicast; 279 } 280 if (dev->flags & IFF_PROMISC) { 281 err = dev_set_promiscuity(real_dev, 1); 282 if (err < 0) 283 goto clear_allmulti; 284 } 285 286 ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr); 287 288 if (vlan->flags & VLAN_FLAG_GVRP) 289 vlan_gvrp_request_join(dev); 290 291 if (vlan->flags & VLAN_FLAG_MVRP) 292 vlan_mvrp_request_join(dev); 293 294 if (netif_carrier_ok(real_dev) && 295 !(vlan->flags & VLAN_FLAG_BRIDGE_BINDING)) 296 netif_carrier_on(dev); 297 return 0; 298 299 clear_allmulti: 300 if (dev->flags & IFF_ALLMULTI) 301 dev_set_allmulti(real_dev, -1); 302 del_unicast: 303 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) 304 dev_uc_del(real_dev, dev->dev_addr); 305 out: 306 netif_carrier_off(dev); 307 return err; 308 } 309 310 static int vlan_dev_stop(struct net_device *dev) 311 { 312 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 313 struct net_device *real_dev = vlan->real_dev; 314 315 dev_mc_unsync(real_dev, dev); 316 dev_uc_unsync(real_dev, dev); 317 if (dev->flags & IFF_ALLMULTI) 318 dev_set_allmulti(real_dev, -1); 319 if (dev->flags & IFF_PROMISC) 320 dev_set_promiscuity(real_dev, -1); 321 322 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) 323 dev_uc_del(real_dev, dev->dev_addr); 324 325 if (!(vlan->flags & VLAN_FLAG_BRIDGE_BINDING)) 326 netif_carrier_off(dev); 327 return 0; 328 } 329 330 static int vlan_dev_set_mac_address(struct net_device *dev, void *p) 331 { 332 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 333 struct sockaddr *addr = p; 334 int err; 335 336 if (!is_valid_ether_addr(addr->sa_data)) 337 return -EADDRNOTAVAIL; 338 339 if (!(dev->flags & IFF_UP)) 340 goto out; 341 342 if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) { 343 err = dev_uc_add(real_dev, addr->sa_data); 344 if (err < 0) 345 return err; 346 } 347 348 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) 349 dev_uc_del(real_dev, dev->dev_addr); 350 351 out: 352 eth_hw_addr_set(dev, addr->sa_data); 353 return 0; 354 } 355 356 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 357 { 358 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 359 const struct net_device_ops *ops = real_dev->netdev_ops; 360 struct ifreq ifrr; 361 int err = -EOPNOTSUPP; 362 363 strscpy_pad(ifrr.ifr_name, real_dev->name, IFNAMSIZ); 364 ifrr.ifr_ifru = ifr->ifr_ifru; 365 366 switch (cmd) { 367 case SIOCSHWTSTAMP: 368 if (!net_eq(dev_net(dev), &init_net)) 369 break; 370 fallthrough; 371 case SIOCGMIIPHY: 372 case SIOCGMIIREG: 373 case SIOCSMIIREG: 374 case SIOCGHWTSTAMP: 375 if (netif_device_present(real_dev) && ops->ndo_eth_ioctl) 376 err = ops->ndo_eth_ioctl(real_dev, &ifrr, cmd); 377 break; 378 } 379 380 if (!err) 381 ifr->ifr_ifru = ifrr.ifr_ifru; 382 383 return err; 384 } 385 386 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa) 387 { 388 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 389 const struct net_device_ops *ops = real_dev->netdev_ops; 390 int err = 0; 391 392 if (netif_device_present(real_dev) && ops->ndo_neigh_setup) 393 err = ops->ndo_neigh_setup(real_dev, pa); 394 395 return err; 396 } 397 398 #if IS_ENABLED(CONFIG_FCOE) 399 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid, 400 struct scatterlist *sgl, unsigned int sgc) 401 { 402 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 403 const struct net_device_ops *ops = real_dev->netdev_ops; 404 int rc = 0; 405 406 if (ops->ndo_fcoe_ddp_setup) 407 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc); 408 409 return rc; 410 } 411 412 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid) 413 { 414 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 415 const struct net_device_ops *ops = real_dev->netdev_ops; 416 int len = 0; 417 418 if (ops->ndo_fcoe_ddp_done) 419 len = ops->ndo_fcoe_ddp_done(real_dev, xid); 420 421 return len; 422 } 423 424 static int vlan_dev_fcoe_enable(struct net_device *dev) 425 { 426 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 427 const struct net_device_ops *ops = real_dev->netdev_ops; 428 int rc = -EINVAL; 429 430 if (ops->ndo_fcoe_enable) 431 rc = ops->ndo_fcoe_enable(real_dev); 432 return rc; 433 } 434 435 static int vlan_dev_fcoe_disable(struct net_device *dev) 436 { 437 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 438 const struct net_device_ops *ops = real_dev->netdev_ops; 439 int rc = -EINVAL; 440 441 if (ops->ndo_fcoe_disable) 442 rc = ops->ndo_fcoe_disable(real_dev); 443 return rc; 444 } 445 446 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid, 447 struct scatterlist *sgl, unsigned int sgc) 448 { 449 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 450 const struct net_device_ops *ops = real_dev->netdev_ops; 451 int rc = 0; 452 453 if (ops->ndo_fcoe_ddp_target) 454 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc); 455 456 return rc; 457 } 458 #endif 459 460 #ifdef NETDEV_FCOE_WWNN 461 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type) 462 { 463 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 464 const struct net_device_ops *ops = real_dev->netdev_ops; 465 int rc = -EINVAL; 466 467 if (ops->ndo_fcoe_get_wwn) 468 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type); 469 return rc; 470 } 471 #endif 472 473 static void vlan_dev_change_rx_flags(struct net_device *dev, int change) 474 { 475 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 476 477 if (dev->flags & IFF_UP) { 478 if (change & IFF_ALLMULTI) 479 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 480 if (change & IFF_PROMISC) 481 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1); 482 } 483 } 484 485 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev) 486 { 487 dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev); 488 dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev); 489 } 490 491 /* 492 * vlan network devices have devices nesting below it, and are a special 493 * "super class" of normal network devices; split their locks off into a 494 * separate class since they always nest. 495 */ 496 static struct lock_class_key vlan_netdev_xmit_lock_key; 497 static struct lock_class_key vlan_netdev_addr_lock_key; 498 499 static void vlan_dev_set_lockdep_one(struct net_device *dev, 500 struct netdev_queue *txq, 501 void *unused) 502 { 503 lockdep_set_class(&txq->_xmit_lock, &vlan_netdev_xmit_lock_key); 504 } 505 506 static void vlan_dev_set_lockdep_class(struct net_device *dev) 507 { 508 lockdep_set_class(&dev->addr_list_lock, 509 &vlan_netdev_addr_lock_key); 510 netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, NULL); 511 } 512 513 static __be16 vlan_parse_protocol(const struct sk_buff *skb) 514 { 515 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data); 516 517 return __vlan_get_protocol(skb, veth->h_vlan_proto, NULL); 518 } 519 520 static const struct header_ops vlan_header_ops = { 521 .create = vlan_dev_hard_header, 522 .parse = eth_header_parse, 523 .parse_protocol = vlan_parse_protocol, 524 }; 525 526 static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev, 527 unsigned short type, 528 const void *daddr, const void *saddr, 529 unsigned int len) 530 { 531 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 532 struct net_device *real_dev = vlan->real_dev; 533 534 if (saddr == NULL) 535 saddr = dev->dev_addr; 536 537 return dev_hard_header(skb, real_dev, type, daddr, saddr, len); 538 } 539 540 static const struct header_ops vlan_passthru_header_ops = { 541 .create = vlan_passthru_hard_header, 542 .parse = eth_header_parse, 543 .parse_protocol = vlan_parse_protocol, 544 }; 545 546 static struct device_type vlan_type = { 547 .name = "vlan", 548 }; 549 550 static const struct net_device_ops vlan_netdev_ops; 551 552 static int vlan_dev_init(struct net_device *dev) 553 { 554 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 555 struct net_device *real_dev = vlan->real_dev; 556 557 netif_carrier_off(dev); 558 559 /* IFF_BROADCAST|IFF_MULTICAST; ??? */ 560 dev->flags = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | 561 IFF_MASTER | IFF_SLAVE); 562 dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) | 563 (1<<__LINK_STATE_DORMANT))) | 564 (1<<__LINK_STATE_PRESENT); 565 566 if (vlan->flags & VLAN_FLAG_BRIDGE_BINDING) 567 dev->state |= (1 << __LINK_STATE_NOCARRIER); 568 569 dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG | 570 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE | 571 NETIF_F_GSO_ENCAP_ALL | 572 NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC | 573 NETIF_F_ALL_FCOE; 574 575 dev->features |= dev->hw_features | NETIF_F_LLTX; 576 netif_inherit_tso_max(dev, real_dev); 577 if (dev->features & NETIF_F_VLAN_FEATURES) 578 netdev_warn(real_dev, "VLAN features are set incorrectly. Q-in-Q configurations may not work correctly.\n"); 579 580 dev->vlan_features = real_dev->vlan_features & ~NETIF_F_ALL_FCOE; 581 dev->hw_enc_features = vlan_tnl_features(real_dev); 582 dev->mpls_features = real_dev->mpls_features; 583 584 /* ipv6 shared card related stuff */ 585 dev->dev_id = real_dev->dev_id; 586 587 if (is_zero_ether_addr(dev->dev_addr)) { 588 eth_hw_addr_set(dev, real_dev->dev_addr); 589 dev->addr_assign_type = NET_ADDR_STOLEN; 590 } 591 if (is_zero_ether_addr(dev->broadcast)) 592 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 593 594 #if IS_ENABLED(CONFIG_FCOE) 595 dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid; 596 #endif 597 598 dev->needed_headroom = real_dev->needed_headroom; 599 if (vlan_hw_offload_capable(real_dev->features, vlan->vlan_proto)) { 600 dev->header_ops = &vlan_passthru_header_ops; 601 dev->hard_header_len = real_dev->hard_header_len; 602 } else { 603 dev->header_ops = &vlan_header_ops; 604 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN; 605 } 606 607 dev->netdev_ops = &vlan_netdev_ops; 608 609 SET_NETDEV_DEVTYPE(dev, &vlan_type); 610 611 vlan_dev_set_lockdep_class(dev); 612 613 vlan->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats); 614 if (!vlan->vlan_pcpu_stats) 615 return -ENOMEM; 616 617 /* Get vlan's reference to real_dev */ 618 netdev_hold(real_dev, &vlan->dev_tracker, GFP_KERNEL); 619 620 return 0; 621 } 622 623 /* Note: this function might be called multiple times for the same device. */ 624 void vlan_dev_free_egress_priority(const struct net_device *dev) 625 { 626 struct vlan_priority_tci_mapping *pm; 627 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 628 int i; 629 630 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { 631 while ((pm = vlan->egress_priority_map[i]) != NULL) { 632 vlan->egress_priority_map[i] = pm->next; 633 kfree(pm); 634 } 635 } 636 } 637 638 static void vlan_dev_uninit(struct net_device *dev) 639 { 640 vlan_dev_free_egress_priority(dev); 641 } 642 643 static netdev_features_t vlan_dev_fix_features(struct net_device *dev, 644 netdev_features_t features) 645 { 646 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 647 netdev_features_t old_features = features; 648 netdev_features_t lower_features; 649 650 lower_features = netdev_intersect_features((real_dev->vlan_features | 651 NETIF_F_RXCSUM), 652 real_dev->features); 653 654 /* Add HW_CSUM setting to preserve user ability to control 655 * checksum offload on the vlan device. 656 */ 657 if (lower_features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM)) 658 lower_features |= NETIF_F_HW_CSUM; 659 features = netdev_intersect_features(features, lower_features); 660 features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE); 661 features |= NETIF_F_LLTX; 662 663 return features; 664 } 665 666 static int vlan_ethtool_get_link_ksettings(struct net_device *dev, 667 struct ethtool_link_ksettings *cmd) 668 { 669 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 670 671 return __ethtool_get_link_ksettings(vlan->real_dev, cmd); 672 } 673 674 static void vlan_ethtool_get_drvinfo(struct net_device *dev, 675 struct ethtool_drvinfo *info) 676 { 677 strscpy(info->driver, vlan_fullname, sizeof(info->driver)); 678 strscpy(info->version, vlan_version, sizeof(info->version)); 679 strscpy(info->fw_version, "N/A", sizeof(info->fw_version)); 680 } 681 682 static int vlan_ethtool_get_ts_info(struct net_device *dev, 683 struct ethtool_ts_info *info) 684 { 685 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 686 const struct ethtool_ops *ops = vlan->real_dev->ethtool_ops; 687 struct phy_device *phydev = vlan->real_dev->phydev; 688 689 if (phy_has_tsinfo(phydev)) { 690 return phy_ts_info(phydev, info); 691 } else if (ops->get_ts_info) { 692 return ops->get_ts_info(vlan->real_dev, info); 693 } else { 694 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE | 695 SOF_TIMESTAMPING_SOFTWARE; 696 info->phc_index = -1; 697 } 698 699 return 0; 700 } 701 702 static void vlan_dev_get_stats64(struct net_device *dev, 703 struct rtnl_link_stats64 *stats) 704 { 705 struct vlan_pcpu_stats *p; 706 u32 rx_errors = 0, tx_dropped = 0; 707 int i; 708 709 for_each_possible_cpu(i) { 710 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes; 711 unsigned int start; 712 713 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i); 714 do { 715 start = u64_stats_fetch_begin(&p->syncp); 716 rxpackets = u64_stats_read(&p->rx_packets); 717 rxbytes = u64_stats_read(&p->rx_bytes); 718 rxmulticast = u64_stats_read(&p->rx_multicast); 719 txpackets = u64_stats_read(&p->tx_packets); 720 txbytes = u64_stats_read(&p->tx_bytes); 721 } while (u64_stats_fetch_retry(&p->syncp, start)); 722 723 stats->rx_packets += rxpackets; 724 stats->rx_bytes += rxbytes; 725 stats->multicast += rxmulticast; 726 stats->tx_packets += txpackets; 727 stats->tx_bytes += txbytes; 728 /* rx_errors & tx_dropped are u32 */ 729 rx_errors += READ_ONCE(p->rx_errors); 730 tx_dropped += READ_ONCE(p->tx_dropped); 731 } 732 stats->rx_errors = rx_errors; 733 stats->tx_dropped = tx_dropped; 734 } 735 736 #ifdef CONFIG_NET_POLL_CONTROLLER 737 static void vlan_dev_poll_controller(struct net_device *dev) 738 { 739 return; 740 } 741 742 static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo) 743 { 744 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 745 struct net_device *real_dev = vlan->real_dev; 746 struct netpoll *netpoll; 747 int err = 0; 748 749 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL); 750 err = -ENOMEM; 751 if (!netpoll) 752 goto out; 753 754 err = __netpoll_setup(netpoll, real_dev); 755 if (err) { 756 kfree(netpoll); 757 goto out; 758 } 759 760 vlan->netpoll = netpoll; 761 762 out: 763 return err; 764 } 765 766 static void vlan_dev_netpoll_cleanup(struct net_device *dev) 767 { 768 struct vlan_dev_priv *vlan= vlan_dev_priv(dev); 769 struct netpoll *netpoll = vlan->netpoll; 770 771 if (!netpoll) 772 return; 773 774 vlan->netpoll = NULL; 775 __netpoll_free(netpoll); 776 } 777 #endif /* CONFIG_NET_POLL_CONTROLLER */ 778 779 static int vlan_dev_get_iflink(const struct net_device *dev) 780 { 781 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 782 783 return real_dev->ifindex; 784 } 785 786 static int vlan_dev_fill_forward_path(struct net_device_path_ctx *ctx, 787 struct net_device_path *path) 788 { 789 struct vlan_dev_priv *vlan = vlan_dev_priv(ctx->dev); 790 791 path->type = DEV_PATH_VLAN; 792 path->encap.id = vlan->vlan_id; 793 path->encap.proto = vlan->vlan_proto; 794 path->dev = ctx->dev; 795 ctx->dev = vlan->real_dev; 796 if (ctx->num_vlans >= ARRAY_SIZE(ctx->vlan)) 797 return -ENOSPC; 798 799 ctx->vlan[ctx->num_vlans].id = vlan->vlan_id; 800 ctx->vlan[ctx->num_vlans].proto = vlan->vlan_proto; 801 ctx->num_vlans++; 802 803 return 0; 804 } 805 806 static const struct ethtool_ops vlan_ethtool_ops = { 807 .get_link_ksettings = vlan_ethtool_get_link_ksettings, 808 .get_drvinfo = vlan_ethtool_get_drvinfo, 809 .get_link = ethtool_op_get_link, 810 .get_ts_info = vlan_ethtool_get_ts_info, 811 }; 812 813 static const struct net_device_ops vlan_netdev_ops = { 814 .ndo_change_mtu = vlan_dev_change_mtu, 815 .ndo_init = vlan_dev_init, 816 .ndo_uninit = vlan_dev_uninit, 817 .ndo_open = vlan_dev_open, 818 .ndo_stop = vlan_dev_stop, 819 .ndo_start_xmit = vlan_dev_hard_start_xmit, 820 .ndo_validate_addr = eth_validate_addr, 821 .ndo_set_mac_address = vlan_dev_set_mac_address, 822 .ndo_set_rx_mode = vlan_dev_set_rx_mode, 823 .ndo_change_rx_flags = vlan_dev_change_rx_flags, 824 .ndo_eth_ioctl = vlan_dev_ioctl, 825 .ndo_neigh_setup = vlan_dev_neigh_setup, 826 .ndo_get_stats64 = vlan_dev_get_stats64, 827 #if IS_ENABLED(CONFIG_FCOE) 828 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup, 829 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done, 830 .ndo_fcoe_enable = vlan_dev_fcoe_enable, 831 .ndo_fcoe_disable = vlan_dev_fcoe_disable, 832 .ndo_fcoe_ddp_target = vlan_dev_fcoe_ddp_target, 833 #endif 834 #ifdef NETDEV_FCOE_WWNN 835 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn, 836 #endif 837 #ifdef CONFIG_NET_POLL_CONTROLLER 838 .ndo_poll_controller = vlan_dev_poll_controller, 839 .ndo_netpoll_setup = vlan_dev_netpoll_setup, 840 .ndo_netpoll_cleanup = vlan_dev_netpoll_cleanup, 841 #endif 842 .ndo_fix_features = vlan_dev_fix_features, 843 .ndo_get_iflink = vlan_dev_get_iflink, 844 .ndo_fill_forward_path = vlan_dev_fill_forward_path, 845 }; 846 847 static void vlan_dev_free(struct net_device *dev) 848 { 849 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 850 851 free_percpu(vlan->vlan_pcpu_stats); 852 vlan->vlan_pcpu_stats = NULL; 853 854 /* Get rid of the vlan's reference to real_dev */ 855 netdev_put(vlan->real_dev, &vlan->dev_tracker); 856 } 857 858 void vlan_setup(struct net_device *dev) 859 { 860 ether_setup(dev); 861 862 dev->priv_flags |= IFF_802_1Q_VLAN | IFF_NO_QUEUE; 863 dev->priv_flags |= IFF_UNICAST_FLT; 864 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 865 netif_keep_dst(dev); 866 867 dev->netdev_ops = &vlan_netdev_ops; 868 dev->needs_free_netdev = true; 869 dev->priv_destructor = vlan_dev_free; 870 dev->ethtool_ops = &vlan_ethtool_ops; 871 872 dev->min_mtu = 0; 873 dev->max_mtu = ETH_MAX_MTU; 874 875 eth_zero_addr(dev->broadcast); 876 } 877