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