1 /* -*- linux-c -*- 2 * INET 802.1Q VLAN 3 * Ethernet-type device handling. 4 * 5 * Authors: Ben Greear <greearb@candelatech.com> 6 * Please send support related email to: netdev@vger.kernel.org 7 * VLAN Home Page: http://www.candelatech.com/~greear/vlan.html 8 * 9 * Fixes: Mar 22 2001: Martin Bokaemper <mbokaemper@unispherenetworks.com> 10 * - reset skb->pkt_type on incoming packets when MAC was changed 11 * - see that changed MAC is saddr for outgoing packets 12 * Oct 20, 2001: Ard van Breeman: 13 * - Fix MC-list, finally. 14 * - Flush MC-list on VLAN destroy. 15 * 16 * 17 * This program is free software; you can redistribute it and/or 18 * modify it under the terms of the GNU General Public License 19 * as published by the Free Software Foundation; either version 20 * 2 of the License, or (at your option) any later version. 21 */ 22 23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 24 25 #include <linux/module.h> 26 #include <linux/slab.h> 27 #include <linux/skbuff.h> 28 #include <linux/netdevice.h> 29 #include <linux/net_tstamp.h> 30 #include <linux/etherdevice.h> 31 #include <linux/ethtool.h> 32 #include <linux/phy.h> 33 #include <net/arp.h> 34 35 #include "vlan.h" 36 #include "vlanproc.h" 37 #include <linux/if_vlan.h> 38 #include <linux/netpoll.h> 39 40 /* 41 * Create the VLAN header for an arbitrary protocol layer 42 * 43 * saddr=NULL means use device source address 44 * daddr=NULL means leave destination address (eg unresolved arp) 45 * 46 * This is called when the SKB is moving down the stack towards the 47 * physical devices. 48 */ 49 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev, 50 unsigned short type, 51 const void *daddr, const void *saddr, 52 unsigned int len) 53 { 54 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 55 struct vlan_hdr *vhdr; 56 unsigned int vhdrlen = 0; 57 u16 vlan_tci = 0; 58 int rc; 59 60 if (!(vlan->flags & VLAN_FLAG_REORDER_HDR)) { 61 vhdr = skb_push(skb, VLAN_HLEN); 62 63 vlan_tci = vlan->vlan_id; 64 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority); 65 vhdr->h_vlan_TCI = htons(vlan_tci); 66 67 /* 68 * Set the protocol type. For a packet of type ETH_P_802_3/2 we 69 * put the length in here instead. 70 */ 71 if (type != ETH_P_802_3 && type != ETH_P_802_2) 72 vhdr->h_vlan_encapsulated_proto = htons(type); 73 else 74 vhdr->h_vlan_encapsulated_proto = htons(len); 75 76 skb->protocol = vlan->vlan_proto; 77 type = ntohs(vlan->vlan_proto); 78 vhdrlen = VLAN_HLEN; 79 } 80 81 /* Before delegating work to the lower layer, enter our MAC-address */ 82 if (saddr == NULL) 83 saddr = dev->dev_addr; 84 85 /* Now make the underlying real hard header */ 86 dev = vlan->real_dev; 87 rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen); 88 if (rc > 0) 89 rc += vhdrlen; 90 return rc; 91 } 92 93 static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb) 94 { 95 #ifdef CONFIG_NET_POLL_CONTROLLER 96 if (vlan->netpoll) 97 netpoll_send_skb(vlan->netpoll, skb); 98 #else 99 BUG(); 100 #endif 101 return NETDEV_TX_OK; 102 } 103 104 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb, 105 struct net_device *dev) 106 { 107 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 108 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data); 109 unsigned int len; 110 int ret; 111 112 /* Handle non-VLAN frames if they are sent to us, for example by DHCP. 113 * 114 * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING 115 * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs... 116 */ 117 if (veth->h_vlan_proto != vlan->vlan_proto || 118 vlan->flags & VLAN_FLAG_REORDER_HDR) { 119 u16 vlan_tci; 120 vlan_tci = vlan->vlan_id; 121 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority); 122 __vlan_hwaccel_put_tag(skb, vlan->vlan_proto, vlan_tci); 123 } 124 125 skb->dev = vlan->real_dev; 126 len = skb->len; 127 if (unlikely(netpoll_tx_running(dev))) 128 return vlan_netpoll_send_skb(vlan, skb); 129 130 ret = dev_queue_xmit(skb); 131 132 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 133 struct vlan_pcpu_stats *stats; 134 135 stats = this_cpu_ptr(vlan->vlan_pcpu_stats); 136 u64_stats_update_begin(&stats->syncp); 137 stats->tx_packets++; 138 stats->tx_bytes += len; 139 u64_stats_update_end(&stats->syncp); 140 } else { 141 this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped); 142 } 143 144 return ret; 145 } 146 147 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu) 148 { 149 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 150 unsigned int max_mtu = real_dev->mtu; 151 152 if (netif_reduces_vlan_mtu(real_dev)) 153 max_mtu -= VLAN_HLEN; 154 if (max_mtu < new_mtu) 155 return -ERANGE; 156 157 dev->mtu = new_mtu; 158 159 return 0; 160 } 161 162 void vlan_dev_set_ingress_priority(const struct net_device *dev, 163 u32 skb_prio, u16 vlan_prio) 164 { 165 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 166 167 if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio) 168 vlan->nr_ingress_mappings--; 169 else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio) 170 vlan->nr_ingress_mappings++; 171 172 vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio; 173 } 174 175 int vlan_dev_set_egress_priority(const struct net_device *dev, 176 u32 skb_prio, u16 vlan_prio) 177 { 178 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 179 struct vlan_priority_tci_mapping *mp = NULL; 180 struct vlan_priority_tci_mapping *np; 181 u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK; 182 183 /* See if a priority mapping exists.. */ 184 mp = vlan->egress_priority_map[skb_prio & 0xF]; 185 while (mp) { 186 if (mp->priority == skb_prio) { 187 if (mp->vlan_qos && !vlan_qos) 188 vlan->nr_egress_mappings--; 189 else if (!mp->vlan_qos && vlan_qos) 190 vlan->nr_egress_mappings++; 191 mp->vlan_qos = vlan_qos; 192 return 0; 193 } 194 mp = mp->next; 195 } 196 197 /* Create a new mapping then. */ 198 mp = vlan->egress_priority_map[skb_prio & 0xF]; 199 np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL); 200 if (!np) 201 return -ENOBUFS; 202 203 np->next = mp; 204 np->priority = skb_prio; 205 np->vlan_qos = vlan_qos; 206 /* Before inserting this element in hash table, make sure all its fields 207 * are committed to memory. 208 * coupled with smp_rmb() in vlan_dev_get_egress_qos_mask() 209 */ 210 smp_wmb(); 211 vlan->egress_priority_map[skb_prio & 0xF] = np; 212 if (vlan_qos) 213 vlan->nr_egress_mappings++; 214 return 0; 215 } 216 217 /* Flags are defined in the vlan_flags enum in 218 * include/uapi/linux/if_vlan.h file. 219 */ 220 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask) 221 { 222 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 223 u32 old_flags = vlan->flags; 224 225 if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP | 226 VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP | 227 VLAN_FLAG_BRIDGE_BINDING)) 228 return -EINVAL; 229 230 vlan->flags = (old_flags & ~mask) | (flags & mask); 231 232 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) { 233 if (vlan->flags & VLAN_FLAG_GVRP) 234 vlan_gvrp_request_join(dev); 235 else 236 vlan_gvrp_request_leave(dev); 237 } 238 239 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) { 240 if (vlan->flags & VLAN_FLAG_MVRP) 241 vlan_mvrp_request_join(dev); 242 else 243 vlan_mvrp_request_leave(dev); 244 } 245 return 0; 246 } 247 248 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result) 249 { 250 strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23); 251 } 252 253 bool vlan_dev_inherit_address(struct net_device *dev, 254 struct net_device *real_dev) 255 { 256 if (dev->addr_assign_type != NET_ADDR_STOLEN) 257 return false; 258 259 ether_addr_copy(dev->dev_addr, real_dev->dev_addr); 260 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 261 return true; 262 } 263 264 static int vlan_dev_open(struct net_device *dev) 265 { 266 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 267 struct net_device *real_dev = vlan->real_dev; 268 int err; 269 270 if (!(real_dev->flags & IFF_UP) && 271 !(vlan->flags & VLAN_FLAG_LOOSE_BINDING)) 272 return -ENETDOWN; 273 274 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr) && 275 !vlan_dev_inherit_address(dev, real_dev)) { 276 err = dev_uc_add(real_dev, dev->dev_addr); 277 if (err < 0) 278 goto out; 279 } 280 281 if (dev->flags & IFF_ALLMULTI) { 282 err = dev_set_allmulti(real_dev, 1); 283 if (err < 0) 284 goto del_unicast; 285 } 286 if (dev->flags & IFF_PROMISC) { 287 err = dev_set_promiscuity(real_dev, 1); 288 if (err < 0) 289 goto clear_allmulti; 290 } 291 292 ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr); 293 294 if (vlan->flags & VLAN_FLAG_GVRP) 295 vlan_gvrp_request_join(dev); 296 297 if (vlan->flags & VLAN_FLAG_MVRP) 298 vlan_mvrp_request_join(dev); 299 300 if (netif_carrier_ok(real_dev) && 301 !(vlan->flags & VLAN_FLAG_BRIDGE_BINDING)) 302 netif_carrier_on(dev); 303 return 0; 304 305 clear_allmulti: 306 if (dev->flags & IFF_ALLMULTI) 307 dev_set_allmulti(real_dev, -1); 308 del_unicast: 309 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) 310 dev_uc_del(real_dev, dev->dev_addr); 311 out: 312 netif_carrier_off(dev); 313 return err; 314 } 315 316 static int vlan_dev_stop(struct net_device *dev) 317 { 318 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 319 struct net_device *real_dev = vlan->real_dev; 320 321 dev_mc_unsync(real_dev, dev); 322 dev_uc_unsync(real_dev, dev); 323 if (dev->flags & IFF_ALLMULTI) 324 dev_set_allmulti(real_dev, -1); 325 if (dev->flags & IFF_PROMISC) 326 dev_set_promiscuity(real_dev, -1); 327 328 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) 329 dev_uc_del(real_dev, dev->dev_addr); 330 331 if (!(vlan->flags & VLAN_FLAG_BRIDGE_BINDING)) 332 netif_carrier_off(dev); 333 return 0; 334 } 335 336 static int vlan_dev_set_mac_address(struct net_device *dev, void *p) 337 { 338 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 339 struct sockaddr *addr = p; 340 int err; 341 342 if (!is_valid_ether_addr(addr->sa_data)) 343 return -EADDRNOTAVAIL; 344 345 if (!(dev->flags & IFF_UP)) 346 goto out; 347 348 if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) { 349 err = dev_uc_add(real_dev, addr->sa_data); 350 if (err < 0) 351 return err; 352 } 353 354 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) 355 dev_uc_del(real_dev, dev->dev_addr); 356 357 out: 358 ether_addr_copy(dev->dev_addr, addr->sa_data); 359 return 0; 360 } 361 362 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 363 { 364 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 365 const struct net_device_ops *ops = real_dev->netdev_ops; 366 struct ifreq ifrr; 367 int err = -EOPNOTSUPP; 368 369 strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ); 370 ifrr.ifr_ifru = ifr->ifr_ifru; 371 372 switch (cmd) { 373 case SIOCSHWTSTAMP: 374 if (!net_eq(dev_net(dev), &init_net)) 375 break; 376 /* fall through */ 377 case SIOCGMIIPHY: 378 case SIOCGMIIREG: 379 case SIOCSMIIREG: 380 case SIOCGHWTSTAMP: 381 if (netif_device_present(real_dev) && ops->ndo_do_ioctl) 382 err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd); 383 break; 384 } 385 386 if (!err) 387 ifr->ifr_ifru = ifrr.ifr_ifru; 388 389 return err; 390 } 391 392 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa) 393 { 394 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 395 const struct net_device_ops *ops = real_dev->netdev_ops; 396 int err = 0; 397 398 if (netif_device_present(real_dev) && ops->ndo_neigh_setup) 399 err = ops->ndo_neigh_setup(real_dev, pa); 400 401 return err; 402 } 403 404 #if IS_ENABLED(CONFIG_FCOE) 405 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid, 406 struct scatterlist *sgl, unsigned int sgc) 407 { 408 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 409 const struct net_device_ops *ops = real_dev->netdev_ops; 410 int rc = 0; 411 412 if (ops->ndo_fcoe_ddp_setup) 413 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc); 414 415 return rc; 416 } 417 418 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid) 419 { 420 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 421 const struct net_device_ops *ops = real_dev->netdev_ops; 422 int len = 0; 423 424 if (ops->ndo_fcoe_ddp_done) 425 len = ops->ndo_fcoe_ddp_done(real_dev, xid); 426 427 return len; 428 } 429 430 static int vlan_dev_fcoe_enable(struct net_device *dev) 431 { 432 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 433 const struct net_device_ops *ops = real_dev->netdev_ops; 434 int rc = -EINVAL; 435 436 if (ops->ndo_fcoe_enable) 437 rc = ops->ndo_fcoe_enable(real_dev); 438 return rc; 439 } 440 441 static int vlan_dev_fcoe_disable(struct net_device *dev) 442 { 443 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 444 const struct net_device_ops *ops = real_dev->netdev_ops; 445 int rc = -EINVAL; 446 447 if (ops->ndo_fcoe_disable) 448 rc = ops->ndo_fcoe_disable(real_dev); 449 return rc; 450 } 451 452 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid, 453 struct scatterlist *sgl, unsigned int sgc) 454 { 455 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 456 const struct net_device_ops *ops = real_dev->netdev_ops; 457 int rc = 0; 458 459 if (ops->ndo_fcoe_ddp_target) 460 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc); 461 462 return rc; 463 } 464 #endif 465 466 #ifdef NETDEV_FCOE_WWNN 467 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type) 468 { 469 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 470 const struct net_device_ops *ops = real_dev->netdev_ops; 471 int rc = -EINVAL; 472 473 if (ops->ndo_fcoe_get_wwn) 474 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type); 475 return rc; 476 } 477 #endif 478 479 static void vlan_dev_change_rx_flags(struct net_device *dev, int change) 480 { 481 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 482 483 if (dev->flags & IFF_UP) { 484 if (change & IFF_ALLMULTI) 485 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 486 if (change & IFF_PROMISC) 487 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1); 488 } 489 } 490 491 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev) 492 { 493 dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev); 494 dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev); 495 } 496 497 /* 498 * vlan network devices have devices nesting below it, and are a special 499 * "super class" of normal network devices; split their locks off into a 500 * separate class since they always nest. 501 */ 502 static struct lock_class_key vlan_netdev_xmit_lock_key; 503 static struct lock_class_key vlan_netdev_addr_lock_key; 504 505 static void vlan_dev_set_lockdep_one(struct net_device *dev, 506 struct netdev_queue *txq, 507 void *_subclass) 508 { 509 lockdep_set_class_and_subclass(&txq->_xmit_lock, 510 &vlan_netdev_xmit_lock_key, 511 *(int *)_subclass); 512 } 513 514 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass) 515 { 516 lockdep_set_class_and_subclass(&dev->addr_list_lock, 517 &vlan_netdev_addr_lock_key, 518 subclass); 519 netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass); 520 } 521 522 static int vlan_dev_get_lock_subclass(struct net_device *dev) 523 { 524 return vlan_dev_priv(dev)->nest_level; 525 } 526 527 static const struct header_ops vlan_header_ops = { 528 .create = vlan_dev_hard_header, 529 .parse = eth_header_parse, 530 }; 531 532 static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev, 533 unsigned short type, 534 const void *daddr, const void *saddr, 535 unsigned int len) 536 { 537 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 538 struct net_device *real_dev = vlan->real_dev; 539 540 if (saddr == NULL) 541 saddr = dev->dev_addr; 542 543 return dev_hard_header(skb, real_dev, type, daddr, saddr, len); 544 } 545 546 static const struct header_ops vlan_passthru_header_ops = { 547 .create = vlan_passthru_hard_header, 548 .parse = eth_header_parse, 549 }; 550 551 static struct device_type vlan_type = { 552 .name = "vlan", 553 }; 554 555 static const struct net_device_ops vlan_netdev_ops; 556 557 static int vlan_dev_init(struct net_device *dev) 558 { 559 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 560 struct net_device *real_dev = vlan->real_dev; 561 562 netif_carrier_off(dev); 563 564 /* IFF_BROADCAST|IFF_MULTICAST; ??? */ 565 dev->flags = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | 566 IFF_MASTER | IFF_SLAVE); 567 dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) | 568 (1<<__LINK_STATE_DORMANT))) | 569 (1<<__LINK_STATE_PRESENT); 570 571 if (vlan->flags & VLAN_FLAG_BRIDGE_BINDING) 572 dev->state |= (1 << __LINK_STATE_NOCARRIER); 573 574 dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG | 575 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE | 576 NETIF_F_GSO_ENCAP_ALL | 577 NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC | 578 NETIF_F_ALL_FCOE; 579 580 dev->features |= dev->hw_features | NETIF_F_LLTX; 581 dev->gso_max_size = real_dev->gso_max_size; 582 dev->gso_max_segs = real_dev->gso_max_segs; 583 if (dev->features & NETIF_F_VLAN_FEATURES) 584 netdev_warn(real_dev, "VLAN features are set incorrectly. Q-in-Q configurations may not work correctly.\n"); 585 586 dev->vlan_features = real_dev->vlan_features & ~NETIF_F_ALL_FCOE; 587 dev->hw_enc_features = vlan_tnl_features(real_dev); 588 589 /* ipv6 shared card related stuff */ 590 dev->dev_id = real_dev->dev_id; 591 592 if (is_zero_ether_addr(dev->dev_addr)) { 593 ether_addr_copy(dev->dev_addr, real_dev->dev_addr); 594 dev->addr_assign_type = NET_ADDR_STOLEN; 595 } 596 if (is_zero_ether_addr(dev->broadcast)) 597 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 598 599 #if IS_ENABLED(CONFIG_FCOE) 600 dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid; 601 #endif 602 603 dev->needed_headroom = real_dev->needed_headroom; 604 if (vlan_hw_offload_capable(real_dev->features, vlan->vlan_proto)) { 605 dev->header_ops = &vlan_passthru_header_ops; 606 dev->hard_header_len = real_dev->hard_header_len; 607 } else { 608 dev->header_ops = &vlan_header_ops; 609 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN; 610 } 611 612 dev->netdev_ops = &vlan_netdev_ops; 613 614 SET_NETDEV_DEVTYPE(dev, &vlan_type); 615 616 vlan_dev_set_lockdep_class(dev, vlan_dev_get_lock_subclass(dev)); 617 618 vlan->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats); 619 if (!vlan->vlan_pcpu_stats) 620 return -ENOMEM; 621 622 return 0; 623 } 624 625 static void vlan_dev_uninit(struct net_device *dev) 626 { 627 struct vlan_priority_tci_mapping *pm; 628 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 629 int i; 630 631 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { 632 while ((pm = vlan->egress_priority_map[i]) != NULL) { 633 vlan->egress_priority_map[i] = pm->next; 634 kfree(pm); 635 } 636 } 637 } 638 639 static netdev_features_t vlan_dev_fix_features(struct net_device *dev, 640 netdev_features_t features) 641 { 642 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 643 netdev_features_t old_features = features; 644 netdev_features_t lower_features; 645 646 lower_features = netdev_intersect_features((real_dev->vlan_features | 647 NETIF_F_RXCSUM), 648 real_dev->features); 649 650 /* Add HW_CSUM setting to preserve user ability to control 651 * checksum offload on the vlan device. 652 */ 653 if (lower_features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM)) 654 lower_features |= NETIF_F_HW_CSUM; 655 features = netdev_intersect_features(features, lower_features); 656 features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE); 657 features |= NETIF_F_LLTX; 658 659 return features; 660 } 661 662 static int vlan_ethtool_get_link_ksettings(struct net_device *dev, 663 struct ethtool_link_ksettings *cmd) 664 { 665 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 666 667 return __ethtool_get_link_ksettings(vlan->real_dev, cmd); 668 } 669 670 static void vlan_ethtool_get_drvinfo(struct net_device *dev, 671 struct ethtool_drvinfo *info) 672 { 673 strlcpy(info->driver, vlan_fullname, sizeof(info->driver)); 674 strlcpy(info->version, vlan_version, sizeof(info->version)); 675 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version)); 676 } 677 678 static int vlan_ethtool_get_ts_info(struct net_device *dev, 679 struct ethtool_ts_info *info) 680 { 681 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 682 const struct ethtool_ops *ops = vlan->real_dev->ethtool_ops; 683 struct phy_device *phydev = vlan->real_dev->phydev; 684 685 if (phydev && phydev->drv && phydev->drv->ts_info) { 686 return phydev->drv->ts_info(phydev, info); 687 } else if (ops->get_ts_info) { 688 return ops->get_ts_info(vlan->real_dev, info); 689 } else { 690 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE | 691 SOF_TIMESTAMPING_SOFTWARE; 692 info->phc_index = -1; 693 } 694 695 return 0; 696 } 697 698 static void vlan_dev_get_stats64(struct net_device *dev, 699 struct rtnl_link_stats64 *stats) 700 { 701 struct vlan_pcpu_stats *p; 702 u32 rx_errors = 0, tx_dropped = 0; 703 int i; 704 705 for_each_possible_cpu(i) { 706 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes; 707 unsigned int start; 708 709 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i); 710 do { 711 start = u64_stats_fetch_begin_irq(&p->syncp); 712 rxpackets = p->rx_packets; 713 rxbytes = p->rx_bytes; 714 rxmulticast = p->rx_multicast; 715 txpackets = p->tx_packets; 716 txbytes = p->tx_bytes; 717 } while (u64_stats_fetch_retry_irq(&p->syncp, start)); 718 719 stats->rx_packets += rxpackets; 720 stats->rx_bytes += rxbytes; 721 stats->multicast += rxmulticast; 722 stats->tx_packets += txpackets; 723 stats->tx_bytes += txbytes; 724 /* rx_errors & tx_dropped are u32 */ 725 rx_errors += p->rx_errors; 726 tx_dropped += p->tx_dropped; 727 } 728 stats->rx_errors = rx_errors; 729 stats->tx_dropped = tx_dropped; 730 } 731 732 #ifdef CONFIG_NET_POLL_CONTROLLER 733 static void vlan_dev_poll_controller(struct net_device *dev) 734 { 735 return; 736 } 737 738 static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo) 739 { 740 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 741 struct net_device *real_dev = vlan->real_dev; 742 struct netpoll *netpoll; 743 int err = 0; 744 745 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL); 746 err = -ENOMEM; 747 if (!netpoll) 748 goto out; 749 750 err = __netpoll_setup(netpoll, real_dev); 751 if (err) { 752 kfree(netpoll); 753 goto out; 754 } 755 756 vlan->netpoll = netpoll; 757 758 out: 759 return err; 760 } 761 762 static void vlan_dev_netpoll_cleanup(struct net_device *dev) 763 { 764 struct vlan_dev_priv *vlan= vlan_dev_priv(dev); 765 struct netpoll *netpoll = vlan->netpoll; 766 767 if (!netpoll) 768 return; 769 770 vlan->netpoll = NULL; 771 __netpoll_free(netpoll); 772 } 773 #endif /* CONFIG_NET_POLL_CONTROLLER */ 774 775 static int vlan_dev_get_iflink(const struct net_device *dev) 776 { 777 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 778 779 return real_dev->ifindex; 780 } 781 782 static const struct ethtool_ops vlan_ethtool_ops = { 783 .get_link_ksettings = vlan_ethtool_get_link_ksettings, 784 .get_drvinfo = vlan_ethtool_get_drvinfo, 785 .get_link = ethtool_op_get_link, 786 .get_ts_info = vlan_ethtool_get_ts_info, 787 }; 788 789 static const struct net_device_ops vlan_netdev_ops = { 790 .ndo_change_mtu = vlan_dev_change_mtu, 791 .ndo_init = vlan_dev_init, 792 .ndo_uninit = vlan_dev_uninit, 793 .ndo_open = vlan_dev_open, 794 .ndo_stop = vlan_dev_stop, 795 .ndo_start_xmit = vlan_dev_hard_start_xmit, 796 .ndo_validate_addr = eth_validate_addr, 797 .ndo_set_mac_address = vlan_dev_set_mac_address, 798 .ndo_set_rx_mode = vlan_dev_set_rx_mode, 799 .ndo_change_rx_flags = vlan_dev_change_rx_flags, 800 .ndo_do_ioctl = vlan_dev_ioctl, 801 .ndo_neigh_setup = vlan_dev_neigh_setup, 802 .ndo_get_stats64 = vlan_dev_get_stats64, 803 #if IS_ENABLED(CONFIG_FCOE) 804 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup, 805 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done, 806 .ndo_fcoe_enable = vlan_dev_fcoe_enable, 807 .ndo_fcoe_disable = vlan_dev_fcoe_disable, 808 .ndo_fcoe_ddp_target = vlan_dev_fcoe_ddp_target, 809 #endif 810 #ifdef NETDEV_FCOE_WWNN 811 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn, 812 #endif 813 #ifdef CONFIG_NET_POLL_CONTROLLER 814 .ndo_poll_controller = vlan_dev_poll_controller, 815 .ndo_netpoll_setup = vlan_dev_netpoll_setup, 816 .ndo_netpoll_cleanup = vlan_dev_netpoll_cleanup, 817 #endif 818 .ndo_fix_features = vlan_dev_fix_features, 819 .ndo_get_lock_subclass = vlan_dev_get_lock_subclass, 820 .ndo_get_iflink = vlan_dev_get_iflink, 821 }; 822 823 static void vlan_dev_free(struct net_device *dev) 824 { 825 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 826 827 free_percpu(vlan->vlan_pcpu_stats); 828 vlan->vlan_pcpu_stats = NULL; 829 } 830 831 void vlan_setup(struct net_device *dev) 832 { 833 ether_setup(dev); 834 835 dev->priv_flags |= IFF_802_1Q_VLAN | IFF_NO_QUEUE; 836 dev->priv_flags |= IFF_UNICAST_FLT; 837 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 838 netif_keep_dst(dev); 839 840 dev->netdev_ops = &vlan_netdev_ops; 841 dev->needs_free_netdev = true; 842 dev->priv_destructor = vlan_dev_free; 843 dev->ethtool_ops = &vlan_ethtool_ops; 844 845 dev->min_mtu = 0; 846 dev->max_mtu = ETH_MAX_MTU; 847 848 eth_zero_addr(dev->broadcast); 849 } 850