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 <net/arp.h> 33 #include <net/switchdev.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 include/linux/if_vlan.h file. */ 218 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask) 219 { 220 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 221 u32 old_flags = vlan->flags; 222 223 if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP | 224 VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP)) 225 return -EINVAL; 226 227 vlan->flags = (old_flags & ~mask) | (flags & mask); 228 229 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) { 230 if (vlan->flags & VLAN_FLAG_GVRP) 231 vlan_gvrp_request_join(dev); 232 else 233 vlan_gvrp_request_leave(dev); 234 } 235 236 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) { 237 if (vlan->flags & VLAN_FLAG_MVRP) 238 vlan_mvrp_request_join(dev); 239 else 240 vlan_mvrp_request_leave(dev); 241 } 242 return 0; 243 } 244 245 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result) 246 { 247 strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23); 248 } 249 250 bool vlan_dev_inherit_address(struct net_device *dev, 251 struct net_device *real_dev) 252 { 253 if (dev->addr_assign_type != NET_ADDR_STOLEN) 254 return false; 255 256 ether_addr_copy(dev->dev_addr, real_dev->dev_addr); 257 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 258 return true; 259 } 260 261 static int vlan_dev_open(struct net_device *dev) 262 { 263 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 264 struct net_device *real_dev = vlan->real_dev; 265 int err; 266 267 if (!(real_dev->flags & IFF_UP) && 268 !(vlan->flags & VLAN_FLAG_LOOSE_BINDING)) 269 return -ENETDOWN; 270 271 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr) && 272 !vlan_dev_inherit_address(dev, real_dev)) { 273 err = dev_uc_add(real_dev, dev->dev_addr); 274 if (err < 0) 275 goto out; 276 } 277 278 if (dev->flags & IFF_ALLMULTI) { 279 err = dev_set_allmulti(real_dev, 1); 280 if (err < 0) 281 goto del_unicast; 282 } 283 if (dev->flags & IFF_PROMISC) { 284 err = dev_set_promiscuity(real_dev, 1); 285 if (err < 0) 286 goto clear_allmulti; 287 } 288 289 ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr); 290 291 if (vlan->flags & VLAN_FLAG_GVRP) 292 vlan_gvrp_request_join(dev); 293 294 if (vlan->flags & VLAN_FLAG_MVRP) 295 vlan_mvrp_request_join(dev); 296 297 if (netif_carrier_ok(real_dev)) 298 netif_carrier_on(dev); 299 return 0; 300 301 clear_allmulti: 302 if (dev->flags & IFF_ALLMULTI) 303 dev_set_allmulti(real_dev, -1); 304 del_unicast: 305 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) 306 dev_uc_del(real_dev, dev->dev_addr); 307 out: 308 netif_carrier_off(dev); 309 return err; 310 } 311 312 static int vlan_dev_stop(struct net_device *dev) 313 { 314 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 315 struct net_device *real_dev = vlan->real_dev; 316 317 dev_mc_unsync(real_dev, dev); 318 dev_uc_unsync(real_dev, dev); 319 if (dev->flags & IFF_ALLMULTI) 320 dev_set_allmulti(real_dev, -1); 321 if (dev->flags & IFF_PROMISC) 322 dev_set_promiscuity(real_dev, -1); 323 324 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) 325 dev_uc_del(real_dev, dev->dev_addr); 326 327 netif_carrier_off(dev); 328 return 0; 329 } 330 331 static int vlan_dev_set_mac_address(struct net_device *dev, void *p) 332 { 333 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 334 struct sockaddr *addr = p; 335 int err; 336 337 if (!is_valid_ether_addr(addr->sa_data)) 338 return -EADDRNOTAVAIL; 339 340 if (!(dev->flags & IFF_UP)) 341 goto out; 342 343 if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) { 344 err = dev_uc_add(real_dev, addr->sa_data); 345 if (err < 0) 346 return err; 347 } 348 349 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) 350 dev_uc_del(real_dev, dev->dev_addr); 351 352 out: 353 ether_addr_copy(dev->dev_addr, addr->sa_data); 354 return 0; 355 } 356 357 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 358 { 359 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 360 const struct net_device_ops *ops = real_dev->netdev_ops; 361 struct ifreq ifrr; 362 int err = -EOPNOTSUPP; 363 364 strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ); 365 ifrr.ifr_ifru = ifr->ifr_ifru; 366 367 switch (cmd) { 368 case SIOCGMIIPHY: 369 case SIOCGMIIREG: 370 case SIOCSMIIREG: 371 case SIOCSHWTSTAMP: 372 case SIOCGHWTSTAMP: 373 if (netif_device_present(real_dev) && ops->ndo_do_ioctl) 374 err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd); 375 break; 376 } 377 378 if (!err) 379 ifr->ifr_ifru = ifrr.ifr_ifru; 380 381 return err; 382 } 383 384 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa) 385 { 386 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 387 const struct net_device_ops *ops = real_dev->netdev_ops; 388 int err = 0; 389 390 if (netif_device_present(real_dev) && ops->ndo_neigh_setup) 391 err = ops->ndo_neigh_setup(real_dev, pa); 392 393 return err; 394 } 395 396 #if IS_ENABLED(CONFIG_FCOE) 397 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid, 398 struct scatterlist *sgl, unsigned int sgc) 399 { 400 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 401 const struct net_device_ops *ops = real_dev->netdev_ops; 402 int rc = 0; 403 404 if (ops->ndo_fcoe_ddp_setup) 405 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc); 406 407 return rc; 408 } 409 410 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid) 411 { 412 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 413 const struct net_device_ops *ops = real_dev->netdev_ops; 414 int len = 0; 415 416 if (ops->ndo_fcoe_ddp_done) 417 len = ops->ndo_fcoe_ddp_done(real_dev, xid); 418 419 return len; 420 } 421 422 static int vlan_dev_fcoe_enable(struct net_device *dev) 423 { 424 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 425 const struct net_device_ops *ops = real_dev->netdev_ops; 426 int rc = -EINVAL; 427 428 if (ops->ndo_fcoe_enable) 429 rc = ops->ndo_fcoe_enable(real_dev); 430 return rc; 431 } 432 433 static int vlan_dev_fcoe_disable(struct net_device *dev) 434 { 435 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 436 const struct net_device_ops *ops = real_dev->netdev_ops; 437 int rc = -EINVAL; 438 439 if (ops->ndo_fcoe_disable) 440 rc = ops->ndo_fcoe_disable(real_dev); 441 return rc; 442 } 443 444 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type) 445 { 446 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 447 const struct net_device_ops *ops = real_dev->netdev_ops; 448 int rc = -EINVAL; 449 450 if (ops->ndo_fcoe_get_wwn) 451 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type); 452 return rc; 453 } 454 455 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid, 456 struct scatterlist *sgl, unsigned int sgc) 457 { 458 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 459 const struct net_device_ops *ops = real_dev->netdev_ops; 460 int rc = 0; 461 462 if (ops->ndo_fcoe_ddp_target) 463 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc); 464 465 return rc; 466 } 467 #endif 468 469 static void vlan_dev_change_rx_flags(struct net_device *dev, int change) 470 { 471 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 472 473 if (dev->flags & IFF_UP) { 474 if (change & IFF_ALLMULTI) 475 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 476 if (change & IFF_PROMISC) 477 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1); 478 } 479 } 480 481 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev) 482 { 483 dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev); 484 dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev); 485 } 486 487 /* 488 * vlan network devices have devices nesting below it, and are a special 489 * "super class" of normal network devices; split their locks off into a 490 * separate class since they always nest. 491 */ 492 static struct lock_class_key vlan_netdev_xmit_lock_key; 493 static struct lock_class_key vlan_netdev_addr_lock_key; 494 495 static void vlan_dev_set_lockdep_one(struct net_device *dev, 496 struct netdev_queue *txq, 497 void *_subclass) 498 { 499 lockdep_set_class_and_subclass(&txq->_xmit_lock, 500 &vlan_netdev_xmit_lock_key, 501 *(int *)_subclass); 502 } 503 504 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass) 505 { 506 lockdep_set_class_and_subclass(&dev->addr_list_lock, 507 &vlan_netdev_addr_lock_key, 508 subclass); 509 netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass); 510 } 511 512 static int vlan_dev_get_lock_subclass(struct net_device *dev) 513 { 514 return vlan_dev_priv(dev)->nest_level; 515 } 516 517 static const struct header_ops vlan_header_ops = { 518 .create = vlan_dev_hard_header, 519 .parse = eth_header_parse, 520 }; 521 522 static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev, 523 unsigned short type, 524 const void *daddr, const void *saddr, 525 unsigned int len) 526 { 527 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 528 struct net_device *real_dev = vlan->real_dev; 529 530 if (saddr == NULL) 531 saddr = dev->dev_addr; 532 533 return dev_hard_header(skb, real_dev, type, daddr, saddr, len); 534 } 535 536 static const struct header_ops vlan_passthru_header_ops = { 537 .create = vlan_passthru_hard_header, 538 .parse = eth_header_parse, 539 }; 540 541 static struct device_type vlan_type = { 542 .name = "vlan", 543 }; 544 545 static const struct net_device_ops vlan_netdev_ops; 546 547 static int vlan_dev_init(struct net_device *dev) 548 { 549 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 550 551 netif_carrier_off(dev); 552 553 /* IFF_BROADCAST|IFF_MULTICAST; ??? */ 554 dev->flags = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | 555 IFF_MASTER | IFF_SLAVE); 556 dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) | 557 (1<<__LINK_STATE_DORMANT))) | 558 (1<<__LINK_STATE_PRESENT); 559 560 dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG | 561 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE | 562 NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC | 563 NETIF_F_ALL_FCOE; 564 565 dev->features |= dev->hw_features | NETIF_F_LLTX; 566 dev->gso_max_size = real_dev->gso_max_size; 567 dev->gso_max_segs = real_dev->gso_max_segs; 568 if (dev->features & NETIF_F_VLAN_FEATURES) 569 netdev_warn(real_dev, "VLAN features are set incorrectly. Q-in-Q configurations may not work correctly.\n"); 570 571 dev->vlan_features = real_dev->vlan_features & ~NETIF_F_ALL_FCOE; 572 573 /* ipv6 shared card related stuff */ 574 dev->dev_id = real_dev->dev_id; 575 576 if (is_zero_ether_addr(dev->dev_addr)) { 577 ether_addr_copy(dev->dev_addr, real_dev->dev_addr); 578 dev->addr_assign_type = NET_ADDR_STOLEN; 579 } 580 if (is_zero_ether_addr(dev->broadcast)) 581 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 582 583 #if IS_ENABLED(CONFIG_FCOE) 584 dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid; 585 #endif 586 587 dev->needed_headroom = real_dev->needed_headroom; 588 if (vlan_hw_offload_capable(real_dev->features, 589 vlan_dev_priv(dev)->vlan_proto)) { 590 dev->header_ops = &vlan_passthru_header_ops; 591 dev->hard_header_len = real_dev->hard_header_len; 592 } else { 593 dev->header_ops = &vlan_header_ops; 594 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN; 595 } 596 597 dev->netdev_ops = &vlan_netdev_ops; 598 599 SET_NETDEV_DEVTYPE(dev, &vlan_type); 600 601 vlan_dev_set_lockdep_class(dev, vlan_dev_get_lock_subclass(dev)); 602 603 vlan_dev_priv(dev)->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats); 604 if (!vlan_dev_priv(dev)->vlan_pcpu_stats) 605 return -ENOMEM; 606 607 return 0; 608 } 609 610 static void vlan_dev_uninit(struct net_device *dev) 611 { 612 struct vlan_priority_tci_mapping *pm; 613 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 614 int i; 615 616 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { 617 while ((pm = vlan->egress_priority_map[i]) != NULL) { 618 vlan->egress_priority_map[i] = pm->next; 619 kfree(pm); 620 } 621 } 622 } 623 624 static netdev_features_t vlan_dev_fix_features(struct net_device *dev, 625 netdev_features_t features) 626 { 627 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 628 netdev_features_t old_features = features; 629 netdev_features_t lower_features; 630 631 lower_features = netdev_intersect_features((real_dev->vlan_features | 632 NETIF_F_RXCSUM), 633 real_dev->features); 634 635 /* Add HW_CSUM setting to preserve user ability to control 636 * checksum offload on the vlan device. 637 */ 638 if (lower_features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM)) 639 lower_features |= NETIF_F_HW_CSUM; 640 features = netdev_intersect_features(features, lower_features); 641 features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE); 642 features |= NETIF_F_LLTX; 643 644 return features; 645 } 646 647 static int vlan_ethtool_get_link_ksettings(struct net_device *dev, 648 struct ethtool_link_ksettings *cmd) 649 { 650 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 651 652 return __ethtool_get_link_ksettings(vlan->real_dev, cmd); 653 } 654 655 static void vlan_ethtool_get_drvinfo(struct net_device *dev, 656 struct ethtool_drvinfo *info) 657 { 658 strlcpy(info->driver, vlan_fullname, sizeof(info->driver)); 659 strlcpy(info->version, vlan_version, sizeof(info->version)); 660 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version)); 661 } 662 663 static int vlan_ethtool_get_ts_info(struct net_device *dev, 664 struct ethtool_ts_info *info) 665 { 666 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 667 const struct ethtool_ops *ops = vlan->real_dev->ethtool_ops; 668 669 if (ops->get_ts_info) { 670 return ops->get_ts_info(vlan->real_dev, info); 671 } else { 672 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE | 673 SOF_TIMESTAMPING_SOFTWARE; 674 info->phc_index = -1; 675 } 676 677 return 0; 678 } 679 680 static void vlan_dev_get_stats64(struct net_device *dev, 681 struct rtnl_link_stats64 *stats) 682 { 683 struct vlan_pcpu_stats *p; 684 u32 rx_errors = 0, tx_dropped = 0; 685 int i; 686 687 for_each_possible_cpu(i) { 688 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes; 689 unsigned int start; 690 691 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i); 692 do { 693 start = u64_stats_fetch_begin_irq(&p->syncp); 694 rxpackets = p->rx_packets; 695 rxbytes = p->rx_bytes; 696 rxmulticast = p->rx_multicast; 697 txpackets = p->tx_packets; 698 txbytes = p->tx_bytes; 699 } while (u64_stats_fetch_retry_irq(&p->syncp, start)); 700 701 stats->rx_packets += rxpackets; 702 stats->rx_bytes += rxbytes; 703 stats->multicast += rxmulticast; 704 stats->tx_packets += txpackets; 705 stats->tx_bytes += txbytes; 706 /* rx_errors & tx_dropped are u32 */ 707 rx_errors += p->rx_errors; 708 tx_dropped += p->tx_dropped; 709 } 710 stats->rx_errors = rx_errors; 711 stats->tx_dropped = tx_dropped; 712 } 713 714 #ifdef CONFIG_NET_POLL_CONTROLLER 715 static void vlan_dev_poll_controller(struct net_device *dev) 716 { 717 return; 718 } 719 720 static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo) 721 { 722 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 723 struct net_device *real_dev = vlan->real_dev; 724 struct netpoll *netpoll; 725 int err = 0; 726 727 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL); 728 err = -ENOMEM; 729 if (!netpoll) 730 goto out; 731 732 err = __netpoll_setup(netpoll, real_dev); 733 if (err) { 734 kfree(netpoll); 735 goto out; 736 } 737 738 vlan->netpoll = netpoll; 739 740 out: 741 return err; 742 } 743 744 static void vlan_dev_netpoll_cleanup(struct net_device *dev) 745 { 746 struct vlan_dev_priv *vlan= vlan_dev_priv(dev); 747 struct netpoll *netpoll = vlan->netpoll; 748 749 if (!netpoll) 750 return; 751 752 vlan->netpoll = NULL; 753 754 __netpoll_free_async(netpoll); 755 } 756 #endif /* CONFIG_NET_POLL_CONTROLLER */ 757 758 static int vlan_dev_get_iflink(const struct net_device *dev) 759 { 760 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 761 762 return real_dev->ifindex; 763 } 764 765 static const struct ethtool_ops vlan_ethtool_ops = { 766 .get_link_ksettings = vlan_ethtool_get_link_ksettings, 767 .get_drvinfo = vlan_ethtool_get_drvinfo, 768 .get_link = ethtool_op_get_link, 769 .get_ts_info = vlan_ethtool_get_ts_info, 770 }; 771 772 static const struct net_device_ops vlan_netdev_ops = { 773 .ndo_change_mtu = vlan_dev_change_mtu, 774 .ndo_init = vlan_dev_init, 775 .ndo_uninit = vlan_dev_uninit, 776 .ndo_open = vlan_dev_open, 777 .ndo_stop = vlan_dev_stop, 778 .ndo_start_xmit = vlan_dev_hard_start_xmit, 779 .ndo_validate_addr = eth_validate_addr, 780 .ndo_set_mac_address = vlan_dev_set_mac_address, 781 .ndo_set_rx_mode = vlan_dev_set_rx_mode, 782 .ndo_change_rx_flags = vlan_dev_change_rx_flags, 783 .ndo_do_ioctl = vlan_dev_ioctl, 784 .ndo_neigh_setup = vlan_dev_neigh_setup, 785 .ndo_get_stats64 = vlan_dev_get_stats64, 786 #if IS_ENABLED(CONFIG_FCOE) 787 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup, 788 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done, 789 .ndo_fcoe_enable = vlan_dev_fcoe_enable, 790 .ndo_fcoe_disable = vlan_dev_fcoe_disable, 791 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn, 792 .ndo_fcoe_ddp_target = vlan_dev_fcoe_ddp_target, 793 #endif 794 #ifdef CONFIG_NET_POLL_CONTROLLER 795 .ndo_poll_controller = vlan_dev_poll_controller, 796 .ndo_netpoll_setup = vlan_dev_netpoll_setup, 797 .ndo_netpoll_cleanup = vlan_dev_netpoll_cleanup, 798 #endif 799 .ndo_fix_features = vlan_dev_fix_features, 800 .ndo_get_lock_subclass = vlan_dev_get_lock_subclass, 801 .ndo_get_iflink = vlan_dev_get_iflink, 802 }; 803 804 static void vlan_dev_free(struct net_device *dev) 805 { 806 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 807 808 free_percpu(vlan->vlan_pcpu_stats); 809 vlan->vlan_pcpu_stats = NULL; 810 } 811 812 void vlan_setup(struct net_device *dev) 813 { 814 ether_setup(dev); 815 816 dev->priv_flags |= IFF_802_1Q_VLAN | IFF_NO_QUEUE; 817 dev->priv_flags |= IFF_UNICAST_FLT; 818 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 819 netif_keep_dst(dev); 820 821 dev->netdev_ops = &vlan_netdev_ops; 822 dev->needs_free_netdev = true; 823 dev->priv_destructor = vlan_dev_free; 824 dev->ethtool_ops = &vlan_ethtool_ops; 825 826 dev->min_mtu = 0; 827 dev->max_mtu = ETH_MAX_MTU; 828 829 eth_zero_addr(dev->broadcast); 830 } 831