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 219 * include/uapi/linux/if_vlan.h file. 220 */ 221 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask) 222 { 223 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 224 u32 old_flags = vlan->flags; 225 226 if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP | 227 VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP)) 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 netif_carrier_on(dev); 302 return 0; 303 304 clear_allmulti: 305 if (dev->flags & IFF_ALLMULTI) 306 dev_set_allmulti(real_dev, -1); 307 del_unicast: 308 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) 309 dev_uc_del(real_dev, dev->dev_addr); 310 out: 311 netif_carrier_off(dev); 312 return err; 313 } 314 315 static int vlan_dev_stop(struct net_device *dev) 316 { 317 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 318 struct net_device *real_dev = vlan->real_dev; 319 320 dev_mc_unsync(real_dev, dev); 321 dev_uc_unsync(real_dev, dev); 322 if (dev->flags & IFF_ALLMULTI) 323 dev_set_allmulti(real_dev, -1); 324 if (dev->flags & IFF_PROMISC) 325 dev_set_promiscuity(real_dev, -1); 326 327 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) 328 dev_uc_del(real_dev, dev->dev_addr); 329 330 netif_carrier_off(dev); 331 return 0; 332 } 333 334 static int vlan_dev_set_mac_address(struct net_device *dev, void *p) 335 { 336 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 337 struct sockaddr *addr = p; 338 int err; 339 340 if (!is_valid_ether_addr(addr->sa_data)) 341 return -EADDRNOTAVAIL; 342 343 if (!(dev->flags & IFF_UP)) 344 goto out; 345 346 if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) { 347 err = dev_uc_add(real_dev, addr->sa_data); 348 if (err < 0) 349 return err; 350 } 351 352 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) 353 dev_uc_del(real_dev, dev->dev_addr); 354 355 out: 356 ether_addr_copy(dev->dev_addr, addr->sa_data); 357 return 0; 358 } 359 360 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 361 { 362 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 363 const struct net_device_ops *ops = real_dev->netdev_ops; 364 struct ifreq ifrr; 365 int err = -EOPNOTSUPP; 366 367 strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ); 368 ifrr.ifr_ifru = ifr->ifr_ifru; 369 370 switch (cmd) { 371 case SIOCGMIIPHY: 372 case SIOCGMIIREG: 373 case SIOCSMIIREG: 374 case SIOCSHWTSTAMP: 375 case SIOCGHWTSTAMP: 376 if (netif_device_present(real_dev) && ops->ndo_do_ioctl) 377 err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd); 378 break; 379 } 380 381 if (!err) 382 ifr->ifr_ifru = ifrr.ifr_ifru; 383 384 return err; 385 } 386 387 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa) 388 { 389 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 390 const struct net_device_ops *ops = real_dev->netdev_ops; 391 int err = 0; 392 393 if (netif_device_present(real_dev) && ops->ndo_neigh_setup) 394 err = ops->ndo_neigh_setup(real_dev, pa); 395 396 return err; 397 } 398 399 #if IS_ENABLED(CONFIG_FCOE) 400 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid, 401 struct scatterlist *sgl, unsigned int sgc) 402 { 403 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 404 const struct net_device_ops *ops = real_dev->netdev_ops; 405 int rc = 0; 406 407 if (ops->ndo_fcoe_ddp_setup) 408 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc); 409 410 return rc; 411 } 412 413 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid) 414 { 415 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 416 const struct net_device_ops *ops = real_dev->netdev_ops; 417 int len = 0; 418 419 if (ops->ndo_fcoe_ddp_done) 420 len = ops->ndo_fcoe_ddp_done(real_dev, xid); 421 422 return len; 423 } 424 425 static int vlan_dev_fcoe_enable(struct net_device *dev) 426 { 427 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 428 const struct net_device_ops *ops = real_dev->netdev_ops; 429 int rc = -EINVAL; 430 431 if (ops->ndo_fcoe_enable) 432 rc = ops->ndo_fcoe_enable(real_dev); 433 return rc; 434 } 435 436 static int vlan_dev_fcoe_disable(struct net_device *dev) 437 { 438 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 439 const struct net_device_ops *ops = real_dev->netdev_ops; 440 int rc = -EINVAL; 441 442 if (ops->ndo_fcoe_disable) 443 rc = ops->ndo_fcoe_disable(real_dev); 444 return rc; 445 } 446 447 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type) 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 = -EINVAL; 452 453 if (ops->ndo_fcoe_get_wwn) 454 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type); 455 return rc; 456 } 457 458 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid, 459 struct scatterlist *sgl, unsigned int sgc) 460 { 461 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 462 const struct net_device_ops *ops = real_dev->netdev_ops; 463 int rc = 0; 464 465 if (ops->ndo_fcoe_ddp_target) 466 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc); 467 468 return rc; 469 } 470 #endif 471 472 static void vlan_dev_change_rx_flags(struct net_device *dev, int change) 473 { 474 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 475 476 if (dev->flags & IFF_UP) { 477 if (change & IFF_ALLMULTI) 478 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 479 if (change & IFF_PROMISC) 480 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1); 481 } 482 } 483 484 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev) 485 { 486 dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev); 487 dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev); 488 } 489 490 /* 491 * vlan network devices have devices nesting below it, and are a special 492 * "super class" of normal network devices; split their locks off into a 493 * separate class since they always nest. 494 */ 495 static struct lock_class_key vlan_netdev_xmit_lock_key; 496 static struct lock_class_key vlan_netdev_addr_lock_key; 497 498 static void vlan_dev_set_lockdep_one(struct net_device *dev, 499 struct netdev_queue *txq, 500 void *_subclass) 501 { 502 lockdep_set_class_and_subclass(&txq->_xmit_lock, 503 &vlan_netdev_xmit_lock_key, 504 *(int *)_subclass); 505 } 506 507 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass) 508 { 509 lockdep_set_class_and_subclass(&dev->addr_list_lock, 510 &vlan_netdev_addr_lock_key, 511 subclass); 512 netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass); 513 } 514 515 static int vlan_dev_get_lock_subclass(struct net_device *dev) 516 { 517 return vlan_dev_priv(dev)->nest_level; 518 } 519 520 static const struct header_ops vlan_header_ops = { 521 .create = vlan_dev_hard_header, 522 .parse = eth_header_parse, 523 }; 524 525 static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev, 526 unsigned short type, 527 const void *daddr, const void *saddr, 528 unsigned int len) 529 { 530 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 531 struct net_device *real_dev = vlan->real_dev; 532 533 if (saddr == NULL) 534 saddr = dev->dev_addr; 535 536 return dev_hard_header(skb, real_dev, type, daddr, saddr, len); 537 } 538 539 static const struct header_ops vlan_passthru_header_ops = { 540 .create = vlan_passthru_hard_header, 541 .parse = eth_header_parse, 542 }; 543 544 static struct device_type vlan_type = { 545 .name = "vlan", 546 }; 547 548 static const struct net_device_ops vlan_netdev_ops; 549 550 static int vlan_dev_init(struct net_device *dev) 551 { 552 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 553 554 netif_carrier_off(dev); 555 556 /* IFF_BROADCAST|IFF_MULTICAST; ??? */ 557 dev->flags = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | 558 IFF_MASTER | IFF_SLAVE); 559 dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) | 560 (1<<__LINK_STATE_DORMANT))) | 561 (1<<__LINK_STATE_PRESENT); 562 563 dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG | 564 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE | 565 NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC | 566 NETIF_F_ALL_FCOE; 567 568 dev->features |= dev->hw_features | NETIF_F_LLTX; 569 dev->gso_max_size = real_dev->gso_max_size; 570 dev->gso_max_segs = real_dev->gso_max_segs; 571 if (dev->features & NETIF_F_VLAN_FEATURES) 572 netdev_warn(real_dev, "VLAN features are set incorrectly. Q-in-Q configurations may not work correctly.\n"); 573 574 dev->vlan_features = real_dev->vlan_features & ~NETIF_F_ALL_FCOE; 575 576 /* ipv6 shared card related stuff */ 577 dev->dev_id = real_dev->dev_id; 578 579 if (is_zero_ether_addr(dev->dev_addr)) { 580 ether_addr_copy(dev->dev_addr, real_dev->dev_addr); 581 dev->addr_assign_type = NET_ADDR_STOLEN; 582 } 583 if (is_zero_ether_addr(dev->broadcast)) 584 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 585 586 #if IS_ENABLED(CONFIG_FCOE) 587 dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid; 588 #endif 589 590 dev->needed_headroom = real_dev->needed_headroom; 591 if (vlan_hw_offload_capable(real_dev->features, 592 vlan_dev_priv(dev)->vlan_proto)) { 593 dev->header_ops = &vlan_passthru_header_ops; 594 dev->hard_header_len = real_dev->hard_header_len; 595 } else { 596 dev->header_ops = &vlan_header_ops; 597 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN; 598 } 599 600 dev->netdev_ops = &vlan_netdev_ops; 601 602 SET_NETDEV_DEVTYPE(dev, &vlan_type); 603 604 vlan_dev_set_lockdep_class(dev, vlan_dev_get_lock_subclass(dev)); 605 606 vlan_dev_priv(dev)->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats); 607 if (!vlan_dev_priv(dev)->vlan_pcpu_stats) 608 return -ENOMEM; 609 610 return 0; 611 } 612 613 static void vlan_dev_uninit(struct net_device *dev) 614 { 615 struct vlan_priority_tci_mapping *pm; 616 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 617 int i; 618 619 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { 620 while ((pm = vlan->egress_priority_map[i]) != NULL) { 621 vlan->egress_priority_map[i] = pm->next; 622 kfree(pm); 623 } 624 } 625 } 626 627 static netdev_features_t vlan_dev_fix_features(struct net_device *dev, 628 netdev_features_t features) 629 { 630 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 631 netdev_features_t old_features = features; 632 netdev_features_t lower_features; 633 634 lower_features = netdev_intersect_features((real_dev->vlan_features | 635 NETIF_F_RXCSUM), 636 real_dev->features); 637 638 /* Add HW_CSUM setting to preserve user ability to control 639 * checksum offload on the vlan device. 640 */ 641 if (lower_features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM)) 642 lower_features |= NETIF_F_HW_CSUM; 643 features = netdev_intersect_features(features, lower_features); 644 features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE); 645 features |= NETIF_F_LLTX; 646 647 return features; 648 } 649 650 static int vlan_ethtool_get_link_ksettings(struct net_device *dev, 651 struct ethtool_link_ksettings *cmd) 652 { 653 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 654 655 return __ethtool_get_link_ksettings(vlan->real_dev, cmd); 656 } 657 658 static void vlan_ethtool_get_drvinfo(struct net_device *dev, 659 struct ethtool_drvinfo *info) 660 { 661 strlcpy(info->driver, vlan_fullname, sizeof(info->driver)); 662 strlcpy(info->version, vlan_version, sizeof(info->version)); 663 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version)); 664 } 665 666 static int vlan_ethtool_get_ts_info(struct net_device *dev, 667 struct ethtool_ts_info *info) 668 { 669 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 670 const struct ethtool_ops *ops = vlan->real_dev->ethtool_ops; 671 struct phy_device *phydev = vlan->real_dev->phydev; 672 673 if (phydev && phydev->drv && phydev->drv->ts_info) { 674 return phydev->drv->ts_info(phydev, info); 675 } else if (ops->get_ts_info) { 676 return ops->get_ts_info(vlan->real_dev, info); 677 } else { 678 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE | 679 SOF_TIMESTAMPING_SOFTWARE; 680 info->phc_index = -1; 681 } 682 683 return 0; 684 } 685 686 static void vlan_dev_get_stats64(struct net_device *dev, 687 struct rtnl_link_stats64 *stats) 688 { 689 struct vlan_pcpu_stats *p; 690 u32 rx_errors = 0, tx_dropped = 0; 691 int i; 692 693 for_each_possible_cpu(i) { 694 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes; 695 unsigned int start; 696 697 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i); 698 do { 699 start = u64_stats_fetch_begin_irq(&p->syncp); 700 rxpackets = p->rx_packets; 701 rxbytes = p->rx_bytes; 702 rxmulticast = p->rx_multicast; 703 txpackets = p->tx_packets; 704 txbytes = p->tx_bytes; 705 } while (u64_stats_fetch_retry_irq(&p->syncp, start)); 706 707 stats->rx_packets += rxpackets; 708 stats->rx_bytes += rxbytes; 709 stats->multicast += rxmulticast; 710 stats->tx_packets += txpackets; 711 stats->tx_bytes += txbytes; 712 /* rx_errors & tx_dropped are u32 */ 713 rx_errors += p->rx_errors; 714 tx_dropped += p->tx_dropped; 715 } 716 stats->rx_errors = rx_errors; 717 stats->tx_dropped = tx_dropped; 718 } 719 720 #ifdef CONFIG_NET_POLL_CONTROLLER 721 static void vlan_dev_poll_controller(struct net_device *dev) 722 { 723 return; 724 } 725 726 static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo) 727 { 728 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 729 struct net_device *real_dev = vlan->real_dev; 730 struct netpoll *netpoll; 731 int err = 0; 732 733 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL); 734 err = -ENOMEM; 735 if (!netpoll) 736 goto out; 737 738 err = __netpoll_setup(netpoll, real_dev); 739 if (err) { 740 kfree(netpoll); 741 goto out; 742 } 743 744 vlan->netpoll = netpoll; 745 746 out: 747 return err; 748 } 749 750 static void vlan_dev_netpoll_cleanup(struct net_device *dev) 751 { 752 struct vlan_dev_priv *vlan= vlan_dev_priv(dev); 753 struct netpoll *netpoll = vlan->netpoll; 754 755 if (!netpoll) 756 return; 757 758 vlan->netpoll = NULL; 759 760 __netpoll_free_async(netpoll); 761 } 762 #endif /* CONFIG_NET_POLL_CONTROLLER */ 763 764 static int vlan_dev_get_iflink(const struct net_device *dev) 765 { 766 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 767 768 return real_dev->ifindex; 769 } 770 771 static const struct ethtool_ops vlan_ethtool_ops = { 772 .get_link_ksettings = vlan_ethtool_get_link_ksettings, 773 .get_drvinfo = vlan_ethtool_get_drvinfo, 774 .get_link = ethtool_op_get_link, 775 .get_ts_info = vlan_ethtool_get_ts_info, 776 }; 777 778 static const struct net_device_ops vlan_netdev_ops = { 779 .ndo_change_mtu = vlan_dev_change_mtu, 780 .ndo_init = vlan_dev_init, 781 .ndo_uninit = vlan_dev_uninit, 782 .ndo_open = vlan_dev_open, 783 .ndo_stop = vlan_dev_stop, 784 .ndo_start_xmit = vlan_dev_hard_start_xmit, 785 .ndo_validate_addr = eth_validate_addr, 786 .ndo_set_mac_address = vlan_dev_set_mac_address, 787 .ndo_set_rx_mode = vlan_dev_set_rx_mode, 788 .ndo_change_rx_flags = vlan_dev_change_rx_flags, 789 .ndo_do_ioctl = vlan_dev_ioctl, 790 .ndo_neigh_setup = vlan_dev_neigh_setup, 791 .ndo_get_stats64 = vlan_dev_get_stats64, 792 #if IS_ENABLED(CONFIG_FCOE) 793 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup, 794 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done, 795 .ndo_fcoe_enable = vlan_dev_fcoe_enable, 796 .ndo_fcoe_disable = vlan_dev_fcoe_disable, 797 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn, 798 .ndo_fcoe_ddp_target = vlan_dev_fcoe_ddp_target, 799 #endif 800 #ifdef CONFIG_NET_POLL_CONTROLLER 801 .ndo_poll_controller = vlan_dev_poll_controller, 802 .ndo_netpoll_setup = vlan_dev_netpoll_setup, 803 .ndo_netpoll_cleanup = vlan_dev_netpoll_cleanup, 804 #endif 805 .ndo_fix_features = vlan_dev_fix_features, 806 .ndo_get_lock_subclass = vlan_dev_get_lock_subclass, 807 .ndo_get_iflink = vlan_dev_get_iflink, 808 }; 809 810 static void vlan_dev_free(struct net_device *dev) 811 { 812 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 813 814 free_percpu(vlan->vlan_pcpu_stats); 815 vlan->vlan_pcpu_stats = NULL; 816 } 817 818 void vlan_setup(struct net_device *dev) 819 { 820 ether_setup(dev); 821 822 dev->priv_flags |= IFF_802_1Q_VLAN | IFF_NO_QUEUE; 823 dev->priv_flags |= IFF_UNICAST_FLT; 824 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 825 netif_keep_dst(dev); 826 827 dev->netdev_ops = &vlan_netdev_ops; 828 dev->needs_free_netdev = true; 829 dev->priv_destructor = vlan_dev_free; 830 dev->ethtool_ops = &vlan_ethtool_ops; 831 832 dev->min_mtu = 0; 833 dev->max_mtu = ETH_MAX_MTU; 834 835 eth_zero_addr(dev->broadcast); 836 } 837