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 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) 248 { 249 strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23); 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 ether_addr_copy(dev->dev_addr, 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 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr) && 274 !vlan_dev_inherit_address(dev, real_dev)) { 275 err = dev_uc_add(real_dev, dev->dev_addr); 276 if (err < 0) 277 goto out; 278 } 279 280 if (dev->flags & IFF_ALLMULTI) { 281 err = dev_set_allmulti(real_dev, 1); 282 if (err < 0) 283 goto del_unicast; 284 } 285 if (dev->flags & IFF_PROMISC) { 286 err = dev_set_promiscuity(real_dev, 1); 287 if (err < 0) 288 goto clear_allmulti; 289 } 290 291 ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr); 292 293 if (vlan->flags & VLAN_FLAG_GVRP) 294 vlan_gvrp_request_join(dev); 295 296 if (vlan->flags & VLAN_FLAG_MVRP) 297 vlan_mvrp_request_join(dev); 298 299 if (netif_carrier_ok(real_dev)) 300 netif_carrier_on(dev); 301 return 0; 302 303 clear_allmulti: 304 if (dev->flags & IFF_ALLMULTI) 305 dev_set_allmulti(real_dev, -1); 306 del_unicast: 307 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) 308 dev_uc_del(real_dev, dev->dev_addr); 309 out: 310 netif_carrier_off(dev); 311 return err; 312 } 313 314 static int vlan_dev_stop(struct net_device *dev) 315 { 316 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 317 struct net_device *real_dev = vlan->real_dev; 318 319 dev_mc_unsync(real_dev, dev); 320 dev_uc_unsync(real_dev, dev); 321 if (dev->flags & IFF_ALLMULTI) 322 dev_set_allmulti(real_dev, -1); 323 if (dev->flags & IFF_PROMISC) 324 dev_set_promiscuity(real_dev, -1); 325 326 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) 327 dev_uc_del(real_dev, dev->dev_addr); 328 329 netif_carrier_off(dev); 330 return 0; 331 } 332 333 static int vlan_dev_set_mac_address(struct net_device *dev, void *p) 334 { 335 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 336 struct sockaddr *addr = p; 337 int err; 338 339 if (!is_valid_ether_addr(addr->sa_data)) 340 return -EADDRNOTAVAIL; 341 342 if (!(dev->flags & IFF_UP)) 343 goto out; 344 345 if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) { 346 err = dev_uc_add(real_dev, addr->sa_data); 347 if (err < 0) 348 return err; 349 } 350 351 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) 352 dev_uc_del(real_dev, dev->dev_addr); 353 354 out: 355 ether_addr_copy(dev->dev_addr, addr->sa_data); 356 return 0; 357 } 358 359 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 360 { 361 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 362 const struct net_device_ops *ops = real_dev->netdev_ops; 363 struct ifreq ifrr; 364 int err = -EOPNOTSUPP; 365 366 strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ); 367 ifrr.ifr_ifru = ifr->ifr_ifru; 368 369 switch (cmd) { 370 case SIOCGMIIPHY: 371 case SIOCGMIIREG: 372 case SIOCSMIIREG: 373 case SIOCSHWTSTAMP: 374 case SIOCGHWTSTAMP: 375 if (netif_device_present(real_dev) && ops->ndo_do_ioctl) 376 err = ops->ndo_do_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 *_subclass) 502 { 503 lockdep_set_class_and_subclass(&txq->_xmit_lock, 504 &vlan_netdev_xmit_lock_key, 505 *(int *)_subclass); 506 } 507 508 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass) 509 { 510 lockdep_set_class_and_subclass(&dev->addr_list_lock, 511 &vlan_netdev_addr_lock_key, 512 subclass); 513 netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass); 514 } 515 516 static int vlan_dev_get_lock_subclass(struct net_device *dev) 517 { 518 return vlan_dev_priv(dev)->nest_level; 519 } 520 521 static const struct header_ops vlan_header_ops = { 522 .create = vlan_dev_hard_header, 523 .parse = eth_header_parse, 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 }; 544 545 static struct device_type vlan_type = { 546 .name = "vlan", 547 }; 548 549 static const struct net_device_ops vlan_netdev_ops; 550 551 static int vlan_dev_init(struct net_device *dev) 552 { 553 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 554 555 netif_carrier_off(dev); 556 557 /* IFF_BROADCAST|IFF_MULTICAST; ??? */ 558 dev->flags = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | 559 IFF_MASTER | IFF_SLAVE); 560 dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) | 561 (1<<__LINK_STATE_DORMANT))) | 562 (1<<__LINK_STATE_PRESENT); 563 564 dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG | 565 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE | 566 NETIF_F_GSO_ENCAP_ALL | 567 NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC | 568 NETIF_F_ALL_FCOE; 569 570 dev->features |= dev->hw_features | NETIF_F_LLTX; 571 dev->gso_max_size = real_dev->gso_max_size; 572 dev->gso_max_segs = real_dev->gso_max_segs; 573 if (dev->features & NETIF_F_VLAN_FEATURES) 574 netdev_warn(real_dev, "VLAN features are set incorrectly. Q-in-Q configurations may not work correctly.\n"); 575 576 dev->vlan_features = real_dev->vlan_features & ~NETIF_F_ALL_FCOE; 577 dev->hw_enc_features = vlan_tnl_features(real_dev); 578 579 /* ipv6 shared card related stuff */ 580 dev->dev_id = real_dev->dev_id; 581 582 if (is_zero_ether_addr(dev->dev_addr)) { 583 ether_addr_copy(dev->dev_addr, real_dev->dev_addr); 584 dev->addr_assign_type = NET_ADDR_STOLEN; 585 } 586 if (is_zero_ether_addr(dev->broadcast)) 587 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 588 589 #if IS_ENABLED(CONFIG_FCOE) 590 dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid; 591 #endif 592 593 dev->needed_headroom = real_dev->needed_headroom; 594 if (vlan_hw_offload_capable(real_dev->features, 595 vlan_dev_priv(dev)->vlan_proto)) { 596 dev->header_ops = &vlan_passthru_header_ops; 597 dev->hard_header_len = real_dev->hard_header_len; 598 } else { 599 dev->header_ops = &vlan_header_ops; 600 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN; 601 } 602 603 dev->netdev_ops = &vlan_netdev_ops; 604 605 SET_NETDEV_DEVTYPE(dev, &vlan_type); 606 607 vlan_dev_set_lockdep_class(dev, vlan_dev_get_lock_subclass(dev)); 608 609 vlan_dev_priv(dev)->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats); 610 if (!vlan_dev_priv(dev)->vlan_pcpu_stats) 611 return -ENOMEM; 612 613 return 0; 614 } 615 616 static void vlan_dev_uninit(struct net_device *dev) 617 { 618 struct vlan_priority_tci_mapping *pm; 619 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 620 int i; 621 622 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { 623 while ((pm = vlan->egress_priority_map[i]) != NULL) { 624 vlan->egress_priority_map[i] = pm->next; 625 kfree(pm); 626 } 627 } 628 } 629 630 static netdev_features_t vlan_dev_fix_features(struct net_device *dev, 631 netdev_features_t features) 632 { 633 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 634 netdev_features_t old_features = features; 635 netdev_features_t lower_features; 636 637 lower_features = netdev_intersect_features((real_dev->vlan_features | 638 NETIF_F_RXCSUM), 639 real_dev->features); 640 641 /* Add HW_CSUM setting to preserve user ability to control 642 * checksum offload on the vlan device. 643 */ 644 if (lower_features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM)) 645 lower_features |= NETIF_F_HW_CSUM; 646 features = netdev_intersect_features(features, lower_features); 647 features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE); 648 features |= NETIF_F_LLTX; 649 650 return features; 651 } 652 653 static int vlan_ethtool_get_link_ksettings(struct net_device *dev, 654 struct ethtool_link_ksettings *cmd) 655 { 656 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 657 658 return __ethtool_get_link_ksettings(vlan->real_dev, cmd); 659 } 660 661 static void vlan_ethtool_get_drvinfo(struct net_device *dev, 662 struct ethtool_drvinfo *info) 663 { 664 strlcpy(info->driver, vlan_fullname, sizeof(info->driver)); 665 strlcpy(info->version, vlan_version, sizeof(info->version)); 666 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version)); 667 } 668 669 static int vlan_ethtool_get_ts_info(struct net_device *dev, 670 struct ethtool_ts_info *info) 671 { 672 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 673 const struct ethtool_ops *ops = vlan->real_dev->ethtool_ops; 674 struct phy_device *phydev = vlan->real_dev->phydev; 675 676 if (phydev && phydev->drv && phydev->drv->ts_info) { 677 return phydev->drv->ts_info(phydev, info); 678 } else if (ops->get_ts_info) { 679 return ops->get_ts_info(vlan->real_dev, info); 680 } else { 681 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE | 682 SOF_TIMESTAMPING_SOFTWARE; 683 info->phc_index = -1; 684 } 685 686 return 0; 687 } 688 689 static void vlan_dev_get_stats64(struct net_device *dev, 690 struct rtnl_link_stats64 *stats) 691 { 692 struct vlan_pcpu_stats *p; 693 u32 rx_errors = 0, tx_dropped = 0; 694 int i; 695 696 for_each_possible_cpu(i) { 697 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes; 698 unsigned int start; 699 700 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i); 701 do { 702 start = u64_stats_fetch_begin_irq(&p->syncp); 703 rxpackets = p->rx_packets; 704 rxbytes = p->rx_bytes; 705 rxmulticast = p->rx_multicast; 706 txpackets = p->tx_packets; 707 txbytes = p->tx_bytes; 708 } while (u64_stats_fetch_retry_irq(&p->syncp, start)); 709 710 stats->rx_packets += rxpackets; 711 stats->rx_bytes += rxbytes; 712 stats->multicast += rxmulticast; 713 stats->tx_packets += txpackets; 714 stats->tx_bytes += txbytes; 715 /* rx_errors & tx_dropped are u32 */ 716 rx_errors += p->rx_errors; 717 tx_dropped += p->tx_dropped; 718 } 719 stats->rx_errors = rx_errors; 720 stats->tx_dropped = tx_dropped; 721 } 722 723 #ifdef CONFIG_NET_POLL_CONTROLLER 724 static void vlan_dev_poll_controller(struct net_device *dev) 725 { 726 return; 727 } 728 729 static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo) 730 { 731 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 732 struct net_device *real_dev = vlan->real_dev; 733 struct netpoll *netpoll; 734 int err = 0; 735 736 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL); 737 err = -ENOMEM; 738 if (!netpoll) 739 goto out; 740 741 err = __netpoll_setup(netpoll, real_dev); 742 if (err) { 743 kfree(netpoll); 744 goto out; 745 } 746 747 vlan->netpoll = netpoll; 748 749 out: 750 return err; 751 } 752 753 static void vlan_dev_netpoll_cleanup(struct net_device *dev) 754 { 755 struct vlan_dev_priv *vlan= vlan_dev_priv(dev); 756 struct netpoll *netpoll = vlan->netpoll; 757 758 if (!netpoll) 759 return; 760 761 vlan->netpoll = NULL; 762 __netpoll_free(netpoll); 763 } 764 #endif /* CONFIG_NET_POLL_CONTROLLER */ 765 766 static int vlan_dev_get_iflink(const struct net_device *dev) 767 { 768 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 769 770 return real_dev->ifindex; 771 } 772 773 static const struct ethtool_ops vlan_ethtool_ops = { 774 .get_link_ksettings = vlan_ethtool_get_link_ksettings, 775 .get_drvinfo = vlan_ethtool_get_drvinfo, 776 .get_link = ethtool_op_get_link, 777 .get_ts_info = vlan_ethtool_get_ts_info, 778 }; 779 780 static const struct net_device_ops vlan_netdev_ops = { 781 .ndo_change_mtu = vlan_dev_change_mtu, 782 .ndo_init = vlan_dev_init, 783 .ndo_uninit = vlan_dev_uninit, 784 .ndo_open = vlan_dev_open, 785 .ndo_stop = vlan_dev_stop, 786 .ndo_start_xmit = vlan_dev_hard_start_xmit, 787 .ndo_validate_addr = eth_validate_addr, 788 .ndo_set_mac_address = vlan_dev_set_mac_address, 789 .ndo_set_rx_mode = vlan_dev_set_rx_mode, 790 .ndo_change_rx_flags = vlan_dev_change_rx_flags, 791 .ndo_do_ioctl = vlan_dev_ioctl, 792 .ndo_neigh_setup = vlan_dev_neigh_setup, 793 .ndo_get_stats64 = vlan_dev_get_stats64, 794 #if IS_ENABLED(CONFIG_FCOE) 795 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup, 796 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done, 797 .ndo_fcoe_enable = vlan_dev_fcoe_enable, 798 .ndo_fcoe_disable = vlan_dev_fcoe_disable, 799 .ndo_fcoe_ddp_target = vlan_dev_fcoe_ddp_target, 800 #endif 801 #ifdef NETDEV_FCOE_WWNN 802 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn, 803 #endif 804 #ifdef CONFIG_NET_POLL_CONTROLLER 805 .ndo_poll_controller = vlan_dev_poll_controller, 806 .ndo_netpoll_setup = vlan_dev_netpoll_setup, 807 .ndo_netpoll_cleanup = vlan_dev_netpoll_cleanup, 808 #endif 809 .ndo_fix_features = vlan_dev_fix_features, 810 .ndo_get_lock_subclass = vlan_dev_get_lock_subclass, 811 .ndo_get_iflink = vlan_dev_get_iflink, 812 }; 813 814 static void vlan_dev_free(struct net_device *dev) 815 { 816 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 817 818 free_percpu(vlan->vlan_pcpu_stats); 819 vlan->vlan_pcpu_stats = NULL; 820 } 821 822 void vlan_setup(struct net_device *dev) 823 { 824 ether_setup(dev); 825 826 dev->priv_flags |= IFF_802_1Q_VLAN | IFF_NO_QUEUE; 827 dev->priv_flags |= IFF_UNICAST_FLT; 828 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 829 netif_keep_dst(dev); 830 831 dev->netdev_ops = &vlan_netdev_ops; 832 dev->needs_free_netdev = true; 833 dev->priv_destructor = vlan_dev_free; 834 dev->ethtool_ops = &vlan_ethtool_ops; 835 836 dev->min_mtu = 0; 837 dev->max_mtu = ETH_MAX_MTU; 838 839 eth_zero_addr(dev->broadcast); 840 } 841