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 #include <linux/module.h> 24 #include <linux/slab.h> 25 #include <linux/skbuff.h> 26 #include <linux/netdevice.h> 27 #include <linux/etherdevice.h> 28 #include <linux/ethtool.h> 29 #include <net/arp.h> 30 31 #include "vlan.h" 32 #include "vlanproc.h" 33 #include <linux/if_vlan.h> 34 35 /* 36 * Rebuild the Ethernet MAC header. This is called after an ARP 37 * (or in future other address resolution) has completed on this 38 * sk_buff. We now let ARP fill in the other fields. 39 * 40 * This routine CANNOT use cached dst->neigh! 41 * Really, it is used only when dst->neigh is wrong. 42 * 43 * TODO: This needs a checkup, I'm ignorant here. --BLG 44 */ 45 static int vlan_dev_rebuild_header(struct sk_buff *skb) 46 { 47 struct net_device *dev = skb->dev; 48 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data); 49 50 switch (veth->h_vlan_encapsulated_proto) { 51 #ifdef CONFIG_INET 52 case htons(ETH_P_IP): 53 54 /* TODO: Confirm this will work with VLAN headers... */ 55 return arp_find(veth->h_dest, skb); 56 #endif 57 default: 58 pr_debug("%s: unable to resolve type %X addresses.\n", 59 dev->name, ntohs(veth->h_vlan_encapsulated_proto)); 60 61 memcpy(veth->h_source, dev->dev_addr, ETH_ALEN); 62 break; 63 } 64 65 return 0; 66 } 67 68 static inline struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb) 69 { 70 if (vlan_dev_info(skb->dev)->flags & VLAN_FLAG_REORDER_HDR) { 71 if (skb_cow(skb, skb_headroom(skb)) < 0) 72 skb = NULL; 73 if (skb) { 74 /* Lifted from Gleb's VLAN code... */ 75 memmove(skb->data - ETH_HLEN, 76 skb->data - VLAN_ETH_HLEN, 12); 77 skb->mac_header += VLAN_HLEN; 78 } 79 } 80 81 return skb; 82 } 83 84 static inline void vlan_set_encap_proto(struct sk_buff *skb, 85 struct vlan_hdr *vhdr) 86 { 87 __be16 proto; 88 unsigned char *rawp; 89 90 /* 91 * Was a VLAN packet, grab the encapsulated protocol, which the layer 92 * three protocols care about. 93 */ 94 95 proto = vhdr->h_vlan_encapsulated_proto; 96 if (ntohs(proto) >= 1536) { 97 skb->protocol = proto; 98 return; 99 } 100 101 rawp = skb->data; 102 if (*(unsigned short *)rawp == 0xFFFF) 103 /* 104 * This is a magic hack to spot IPX packets. Older Novell 105 * breaks the protocol design and runs IPX over 802.3 without 106 * an 802.2 LLC layer. We look for FFFF which isn't a used 107 * 802.2 SSAP/DSAP. This won't work for fault tolerant netware 108 * but does for the rest. 109 */ 110 skb->protocol = htons(ETH_P_802_3); 111 else 112 /* 113 * Real 802.2 LLC 114 */ 115 skb->protocol = htons(ETH_P_802_2); 116 } 117 118 /* 119 * Determine the packet's protocol ID. The rule here is that we 120 * assume 802.3 if the type field is short enough to be a length. 121 * This is normal practice and works for any 'now in use' protocol. 122 * 123 * Also, at this point we assume that we ARE dealing exclusively with 124 * VLAN packets, or packets that should be made into VLAN packets based 125 * on a default VLAN ID. 126 * 127 * NOTE: Should be similar to ethernet/eth.c. 128 * 129 * SANITY NOTE: This method is called when a packet is moving up the stack 130 * towards userland. To get here, it would have already passed 131 * through the ethernet/eth.c eth_type_trans() method. 132 * SANITY NOTE 2: We are referencing to the VLAN_HDR frields, which MAY be 133 * stored UNALIGNED in the memory. RISC systems don't like 134 * such cases very much... 135 * SANITY NOTE 2a: According to Dave Miller & Alexey, it will always be 136 * aligned, so there doesn't need to be any of the unaligned 137 * stuff. It has been commented out now... --Ben 138 * 139 */ 140 int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev, 141 struct packet_type *ptype, struct net_device *orig_dev) 142 { 143 struct vlan_hdr *vhdr; 144 struct vlan_pcpu_stats *rx_stats; 145 struct net_device *vlan_dev; 146 u16 vlan_id; 147 u16 vlan_tci; 148 149 skb = skb_share_check(skb, GFP_ATOMIC); 150 if (skb == NULL) 151 goto err_free; 152 153 if (unlikely(!pskb_may_pull(skb, VLAN_HLEN))) 154 goto err_free; 155 156 vhdr = (struct vlan_hdr *)skb->data; 157 vlan_tci = ntohs(vhdr->h_vlan_TCI); 158 vlan_id = vlan_tci & VLAN_VID_MASK; 159 160 rcu_read_lock(); 161 vlan_dev = vlan_find_dev(dev, vlan_id); 162 163 /* If the VLAN device is defined, we use it. 164 * If not, and the VID is 0, it is a 802.1p packet (not 165 * really a VLAN), so we will just netif_rx it later to the 166 * original interface, but with the skb->proto set to the 167 * wrapped proto: we do nothing here. 168 */ 169 170 if (!vlan_dev) { 171 if (vlan_id) { 172 pr_debug("%s: ERROR: No net_device for VID: %u on dev: %s\n", 173 __func__, vlan_id, dev->name); 174 goto err_unlock; 175 } 176 rx_stats = NULL; 177 } else { 178 skb->dev = vlan_dev; 179 180 rx_stats = this_cpu_ptr(vlan_dev_info(skb->dev)->vlan_pcpu_stats); 181 182 u64_stats_update_begin(&rx_stats->syncp); 183 rx_stats->rx_packets++; 184 rx_stats->rx_bytes += skb->len; 185 186 skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tci); 187 188 pr_debug("%s: priority: %u for TCI: %hu\n", 189 __func__, skb->priority, vlan_tci); 190 191 switch (skb->pkt_type) { 192 case PACKET_BROADCAST: 193 /* Yeah, stats collect these together.. */ 194 /* stats->broadcast ++; // no such counter :-( */ 195 break; 196 197 case PACKET_MULTICAST: 198 rx_stats->rx_multicast++; 199 break; 200 201 case PACKET_OTHERHOST: 202 /* Our lower layer thinks this is not local, let's make 203 * sure. 204 * This allows the VLAN to have a different MAC than the 205 * underlying device, and still route correctly. 206 */ 207 if (!compare_ether_addr(eth_hdr(skb)->h_dest, 208 skb->dev->dev_addr)) 209 skb->pkt_type = PACKET_HOST; 210 break; 211 default: 212 break; 213 } 214 u64_stats_update_end(&rx_stats->syncp); 215 } 216 217 skb_pull_rcsum(skb, VLAN_HLEN); 218 vlan_set_encap_proto(skb, vhdr); 219 220 if (vlan_dev) { 221 skb = vlan_check_reorder_header(skb); 222 if (!skb) { 223 rx_stats->rx_errors++; 224 goto err_unlock; 225 } 226 } 227 228 netif_rx(skb); 229 230 rcu_read_unlock(); 231 return NET_RX_SUCCESS; 232 233 err_unlock: 234 rcu_read_unlock(); 235 err_free: 236 atomic_long_inc(&dev->rx_dropped); 237 kfree_skb(skb); 238 return NET_RX_DROP; 239 } 240 241 static inline u16 242 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb) 243 { 244 struct vlan_priority_tci_mapping *mp; 245 246 mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)]; 247 while (mp) { 248 if (mp->priority == skb->priority) { 249 return mp->vlan_qos; /* This should already be shifted 250 * to mask correctly with the 251 * VLAN's TCI */ 252 } 253 mp = mp->next; 254 } 255 return 0; 256 } 257 258 /* 259 * Create the VLAN header for an arbitrary protocol layer 260 * 261 * saddr=NULL means use device source address 262 * daddr=NULL means leave destination address (eg unresolved arp) 263 * 264 * This is called when the SKB is moving down the stack towards the 265 * physical devices. 266 */ 267 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev, 268 unsigned short type, 269 const void *daddr, const void *saddr, 270 unsigned int len) 271 { 272 struct vlan_hdr *vhdr; 273 unsigned int vhdrlen = 0; 274 u16 vlan_tci = 0; 275 int rc; 276 277 if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR)) { 278 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN); 279 280 vlan_tci = vlan_dev_info(dev)->vlan_id; 281 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb); 282 vhdr->h_vlan_TCI = htons(vlan_tci); 283 284 /* 285 * Set the protocol type. For a packet of type ETH_P_802_3/2 we 286 * put the length in here instead. 287 */ 288 if (type != ETH_P_802_3 && type != ETH_P_802_2) 289 vhdr->h_vlan_encapsulated_proto = htons(type); 290 else 291 vhdr->h_vlan_encapsulated_proto = htons(len); 292 293 skb->protocol = htons(ETH_P_8021Q); 294 type = ETH_P_8021Q; 295 vhdrlen = VLAN_HLEN; 296 } 297 298 /* Before delegating work to the lower layer, enter our MAC-address */ 299 if (saddr == NULL) 300 saddr = dev->dev_addr; 301 302 /* Now make the underlying real hard header */ 303 dev = vlan_dev_info(dev)->real_dev; 304 rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen); 305 if (rc > 0) 306 rc += vhdrlen; 307 return rc; 308 } 309 310 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb, 311 struct net_device *dev) 312 { 313 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data); 314 unsigned int len; 315 int ret; 316 317 /* Handle non-VLAN frames if they are sent to us, for example by DHCP. 318 * 319 * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING 320 * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs... 321 */ 322 if (veth->h_vlan_proto != htons(ETH_P_8021Q) || 323 vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) { 324 u16 vlan_tci; 325 vlan_tci = vlan_dev_info(dev)->vlan_id; 326 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb); 327 skb = __vlan_hwaccel_put_tag(skb, vlan_tci); 328 } 329 330 skb_set_dev(skb, vlan_dev_info(dev)->real_dev); 331 len = skb->len; 332 ret = dev_queue_xmit(skb); 333 334 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 335 struct vlan_pcpu_stats *stats; 336 337 stats = this_cpu_ptr(vlan_dev_info(dev)->vlan_pcpu_stats); 338 u64_stats_update_begin(&stats->syncp); 339 stats->tx_packets++; 340 stats->tx_bytes += len; 341 u64_stats_update_begin(&stats->syncp); 342 } else { 343 this_cpu_inc(vlan_dev_info(dev)->vlan_pcpu_stats->tx_dropped); 344 } 345 346 return ret; 347 } 348 349 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu) 350 { 351 /* TODO: gotta make sure the underlying layer can handle it, 352 * maybe an IFF_VLAN_CAPABLE flag for devices? 353 */ 354 if (vlan_dev_info(dev)->real_dev->mtu < new_mtu) 355 return -ERANGE; 356 357 dev->mtu = new_mtu; 358 359 return 0; 360 } 361 362 void vlan_dev_set_ingress_priority(const struct net_device *dev, 363 u32 skb_prio, u16 vlan_prio) 364 { 365 struct vlan_dev_info *vlan = vlan_dev_info(dev); 366 367 if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio) 368 vlan->nr_ingress_mappings--; 369 else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio) 370 vlan->nr_ingress_mappings++; 371 372 vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio; 373 } 374 375 int vlan_dev_set_egress_priority(const struct net_device *dev, 376 u32 skb_prio, u16 vlan_prio) 377 { 378 struct vlan_dev_info *vlan = vlan_dev_info(dev); 379 struct vlan_priority_tci_mapping *mp = NULL; 380 struct vlan_priority_tci_mapping *np; 381 u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK; 382 383 /* See if a priority mapping exists.. */ 384 mp = vlan->egress_priority_map[skb_prio & 0xF]; 385 while (mp) { 386 if (mp->priority == skb_prio) { 387 if (mp->vlan_qos && !vlan_qos) 388 vlan->nr_egress_mappings--; 389 else if (!mp->vlan_qos && vlan_qos) 390 vlan->nr_egress_mappings++; 391 mp->vlan_qos = vlan_qos; 392 return 0; 393 } 394 mp = mp->next; 395 } 396 397 /* Create a new mapping then. */ 398 mp = vlan->egress_priority_map[skb_prio & 0xF]; 399 np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL); 400 if (!np) 401 return -ENOBUFS; 402 403 np->next = mp; 404 np->priority = skb_prio; 405 np->vlan_qos = vlan_qos; 406 vlan->egress_priority_map[skb_prio & 0xF] = np; 407 if (vlan_qos) 408 vlan->nr_egress_mappings++; 409 return 0; 410 } 411 412 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */ 413 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask) 414 { 415 struct vlan_dev_info *vlan = vlan_dev_info(dev); 416 u32 old_flags = vlan->flags; 417 418 if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP | 419 VLAN_FLAG_LOOSE_BINDING)) 420 return -EINVAL; 421 422 vlan->flags = (old_flags & ~mask) | (flags & mask); 423 424 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) { 425 if (vlan->flags & VLAN_FLAG_GVRP) 426 vlan_gvrp_request_join(dev); 427 else 428 vlan_gvrp_request_leave(dev); 429 } 430 return 0; 431 } 432 433 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result) 434 { 435 strncpy(result, vlan_dev_info(dev)->real_dev->name, 23); 436 } 437 438 static int vlan_dev_open(struct net_device *dev) 439 { 440 struct vlan_dev_info *vlan = vlan_dev_info(dev); 441 struct net_device *real_dev = vlan->real_dev; 442 int err; 443 444 if (!(real_dev->flags & IFF_UP) && 445 !(vlan->flags & VLAN_FLAG_LOOSE_BINDING)) 446 return -ENETDOWN; 447 448 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) { 449 err = dev_uc_add(real_dev, dev->dev_addr); 450 if (err < 0) 451 goto out; 452 } 453 454 if (dev->flags & IFF_ALLMULTI) { 455 err = dev_set_allmulti(real_dev, 1); 456 if (err < 0) 457 goto del_unicast; 458 } 459 if (dev->flags & IFF_PROMISC) { 460 err = dev_set_promiscuity(real_dev, 1); 461 if (err < 0) 462 goto clear_allmulti; 463 } 464 465 memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN); 466 467 if (vlan->flags & VLAN_FLAG_GVRP) 468 vlan_gvrp_request_join(dev); 469 470 if (netif_carrier_ok(real_dev)) 471 netif_carrier_on(dev); 472 return 0; 473 474 clear_allmulti: 475 if (dev->flags & IFF_ALLMULTI) 476 dev_set_allmulti(real_dev, -1); 477 del_unicast: 478 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) 479 dev_uc_del(real_dev, dev->dev_addr); 480 out: 481 netif_carrier_off(dev); 482 return err; 483 } 484 485 static int vlan_dev_stop(struct net_device *dev) 486 { 487 struct vlan_dev_info *vlan = vlan_dev_info(dev); 488 struct net_device *real_dev = vlan->real_dev; 489 490 if (vlan->flags & VLAN_FLAG_GVRP) 491 vlan_gvrp_request_leave(dev); 492 493 dev_mc_unsync(real_dev, dev); 494 dev_uc_unsync(real_dev, dev); 495 if (dev->flags & IFF_ALLMULTI) 496 dev_set_allmulti(real_dev, -1); 497 if (dev->flags & IFF_PROMISC) 498 dev_set_promiscuity(real_dev, -1); 499 500 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) 501 dev_uc_del(real_dev, dev->dev_addr); 502 503 netif_carrier_off(dev); 504 return 0; 505 } 506 507 static int vlan_dev_set_mac_address(struct net_device *dev, void *p) 508 { 509 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 510 struct sockaddr *addr = p; 511 int err; 512 513 if (!is_valid_ether_addr(addr->sa_data)) 514 return -EADDRNOTAVAIL; 515 516 if (!(dev->flags & IFF_UP)) 517 goto out; 518 519 if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) { 520 err = dev_uc_add(real_dev, addr->sa_data); 521 if (err < 0) 522 return err; 523 } 524 525 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) 526 dev_uc_del(real_dev, dev->dev_addr); 527 528 out: 529 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); 530 return 0; 531 } 532 533 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 534 { 535 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 536 const struct net_device_ops *ops = real_dev->netdev_ops; 537 struct ifreq ifrr; 538 int err = -EOPNOTSUPP; 539 540 strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ); 541 ifrr.ifr_ifru = ifr->ifr_ifru; 542 543 switch (cmd) { 544 case SIOCGMIIPHY: 545 case SIOCGMIIREG: 546 case SIOCSMIIREG: 547 if (netif_device_present(real_dev) && ops->ndo_do_ioctl) 548 err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd); 549 break; 550 } 551 552 if (!err) 553 ifr->ifr_ifru = ifrr.ifr_ifru; 554 555 return err; 556 } 557 558 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa) 559 { 560 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 561 const struct net_device_ops *ops = real_dev->netdev_ops; 562 int err = 0; 563 564 if (netif_device_present(real_dev) && ops->ndo_neigh_setup) 565 err = ops->ndo_neigh_setup(real_dev, pa); 566 567 return err; 568 } 569 570 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 571 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid, 572 struct scatterlist *sgl, unsigned int sgc) 573 { 574 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 575 const struct net_device_ops *ops = real_dev->netdev_ops; 576 int rc = 0; 577 578 if (ops->ndo_fcoe_ddp_setup) 579 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc); 580 581 return rc; 582 } 583 584 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid) 585 { 586 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 587 const struct net_device_ops *ops = real_dev->netdev_ops; 588 int len = 0; 589 590 if (ops->ndo_fcoe_ddp_done) 591 len = ops->ndo_fcoe_ddp_done(real_dev, xid); 592 593 return len; 594 } 595 596 static int vlan_dev_fcoe_enable(struct net_device *dev) 597 { 598 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 599 const struct net_device_ops *ops = real_dev->netdev_ops; 600 int rc = -EINVAL; 601 602 if (ops->ndo_fcoe_enable) 603 rc = ops->ndo_fcoe_enable(real_dev); 604 return rc; 605 } 606 607 static int vlan_dev_fcoe_disable(struct net_device *dev) 608 { 609 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 610 const struct net_device_ops *ops = real_dev->netdev_ops; 611 int rc = -EINVAL; 612 613 if (ops->ndo_fcoe_disable) 614 rc = ops->ndo_fcoe_disable(real_dev); 615 return rc; 616 } 617 618 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type) 619 { 620 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 621 const struct net_device_ops *ops = real_dev->netdev_ops; 622 int rc = -EINVAL; 623 624 if (ops->ndo_fcoe_get_wwn) 625 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type); 626 return rc; 627 } 628 #endif 629 630 static void vlan_dev_change_rx_flags(struct net_device *dev, int change) 631 { 632 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 633 634 if (change & IFF_ALLMULTI) 635 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 636 if (change & IFF_PROMISC) 637 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1); 638 } 639 640 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev) 641 { 642 dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev); 643 dev_uc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev); 644 } 645 646 /* 647 * vlan network devices have devices nesting below it, and are a special 648 * "super class" of normal network devices; split their locks off into a 649 * separate class since they always nest. 650 */ 651 static struct lock_class_key vlan_netdev_xmit_lock_key; 652 static struct lock_class_key vlan_netdev_addr_lock_key; 653 654 static void vlan_dev_set_lockdep_one(struct net_device *dev, 655 struct netdev_queue *txq, 656 void *_subclass) 657 { 658 lockdep_set_class_and_subclass(&txq->_xmit_lock, 659 &vlan_netdev_xmit_lock_key, 660 *(int *)_subclass); 661 } 662 663 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass) 664 { 665 lockdep_set_class_and_subclass(&dev->addr_list_lock, 666 &vlan_netdev_addr_lock_key, 667 subclass); 668 netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass); 669 } 670 671 static const struct header_ops vlan_header_ops = { 672 .create = vlan_dev_hard_header, 673 .rebuild = vlan_dev_rebuild_header, 674 .parse = eth_header_parse, 675 }; 676 677 static const struct net_device_ops vlan_netdev_ops; 678 679 static int vlan_dev_init(struct net_device *dev) 680 { 681 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 682 int subclass = 0; 683 684 netif_carrier_off(dev); 685 686 /* IFF_BROADCAST|IFF_MULTICAST; ??? */ 687 dev->flags = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | 688 IFF_MASTER | IFF_SLAVE); 689 dev->iflink = real_dev->ifindex; 690 dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) | 691 (1<<__LINK_STATE_DORMANT))) | 692 (1<<__LINK_STATE_PRESENT); 693 694 dev->features |= real_dev->features & real_dev->vlan_features; 695 dev->features |= NETIF_F_LLTX; 696 dev->gso_max_size = real_dev->gso_max_size; 697 698 /* ipv6 shared card related stuff */ 699 dev->dev_id = real_dev->dev_id; 700 701 if (is_zero_ether_addr(dev->dev_addr)) 702 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len); 703 if (is_zero_ether_addr(dev->broadcast)) 704 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 705 706 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 707 dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid; 708 #endif 709 710 if (real_dev->features & NETIF_F_HW_VLAN_TX) { 711 dev->header_ops = real_dev->header_ops; 712 dev->hard_header_len = real_dev->hard_header_len; 713 } else { 714 dev->header_ops = &vlan_header_ops; 715 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN; 716 } 717 718 dev->netdev_ops = &vlan_netdev_ops; 719 720 if (is_vlan_dev(real_dev)) 721 subclass = 1; 722 723 vlan_dev_set_lockdep_class(dev, subclass); 724 725 vlan_dev_info(dev)->vlan_pcpu_stats = alloc_percpu(struct vlan_pcpu_stats); 726 if (!vlan_dev_info(dev)->vlan_pcpu_stats) 727 return -ENOMEM; 728 729 return 0; 730 } 731 732 static void vlan_dev_uninit(struct net_device *dev) 733 { 734 struct vlan_priority_tci_mapping *pm; 735 struct vlan_dev_info *vlan = vlan_dev_info(dev); 736 int i; 737 738 free_percpu(vlan->vlan_pcpu_stats); 739 vlan->vlan_pcpu_stats = NULL; 740 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { 741 while ((pm = vlan->egress_priority_map[i]) != NULL) { 742 vlan->egress_priority_map[i] = pm->next; 743 kfree(pm); 744 } 745 } 746 } 747 748 static int vlan_ethtool_get_settings(struct net_device *dev, 749 struct ethtool_cmd *cmd) 750 { 751 const struct vlan_dev_info *vlan = vlan_dev_info(dev); 752 return dev_ethtool_get_settings(vlan->real_dev, cmd); 753 } 754 755 static void vlan_ethtool_get_drvinfo(struct net_device *dev, 756 struct ethtool_drvinfo *info) 757 { 758 strcpy(info->driver, vlan_fullname); 759 strcpy(info->version, vlan_version); 760 strcpy(info->fw_version, "N/A"); 761 } 762 763 static u32 vlan_ethtool_get_rx_csum(struct net_device *dev) 764 { 765 const struct vlan_dev_info *vlan = vlan_dev_info(dev); 766 return dev_ethtool_get_rx_csum(vlan->real_dev); 767 } 768 769 static u32 vlan_ethtool_get_flags(struct net_device *dev) 770 { 771 const struct vlan_dev_info *vlan = vlan_dev_info(dev); 772 return dev_ethtool_get_flags(vlan->real_dev); 773 } 774 775 static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) 776 { 777 778 if (vlan_dev_info(dev)->vlan_pcpu_stats) { 779 struct vlan_pcpu_stats *p; 780 u32 rx_errors = 0, tx_dropped = 0; 781 int i; 782 783 for_each_possible_cpu(i) { 784 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes; 785 unsigned int start; 786 787 p = per_cpu_ptr(vlan_dev_info(dev)->vlan_pcpu_stats, i); 788 do { 789 start = u64_stats_fetch_begin_bh(&p->syncp); 790 rxpackets = p->rx_packets; 791 rxbytes = p->rx_bytes; 792 rxmulticast = p->rx_multicast; 793 txpackets = p->tx_packets; 794 txbytes = p->tx_bytes; 795 } while (u64_stats_fetch_retry_bh(&p->syncp, start)); 796 797 stats->rx_packets += rxpackets; 798 stats->rx_bytes += rxbytes; 799 stats->multicast += rxmulticast; 800 stats->tx_packets += txpackets; 801 stats->tx_bytes += txbytes; 802 /* rx_errors & tx_dropped are u32 */ 803 rx_errors += p->rx_errors; 804 tx_dropped += p->tx_dropped; 805 } 806 stats->rx_errors = rx_errors; 807 stats->tx_dropped = tx_dropped; 808 } 809 return stats; 810 } 811 812 static int vlan_ethtool_set_tso(struct net_device *dev, u32 data) 813 { 814 if (data) { 815 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 816 817 /* Underlying device must support TSO for VLAN-tagged packets 818 * and must have TSO enabled now. 819 */ 820 if (!(real_dev->vlan_features & NETIF_F_TSO)) 821 return -EOPNOTSUPP; 822 if (!(real_dev->features & NETIF_F_TSO)) 823 return -EINVAL; 824 dev->features |= NETIF_F_TSO; 825 } else { 826 dev->features &= ~NETIF_F_TSO; 827 } 828 return 0; 829 } 830 831 static const struct ethtool_ops vlan_ethtool_ops = { 832 .get_settings = vlan_ethtool_get_settings, 833 .get_drvinfo = vlan_ethtool_get_drvinfo, 834 .get_link = ethtool_op_get_link, 835 .get_rx_csum = vlan_ethtool_get_rx_csum, 836 .get_flags = vlan_ethtool_get_flags, 837 .set_tso = vlan_ethtool_set_tso, 838 }; 839 840 static const struct net_device_ops vlan_netdev_ops = { 841 .ndo_change_mtu = vlan_dev_change_mtu, 842 .ndo_init = vlan_dev_init, 843 .ndo_uninit = vlan_dev_uninit, 844 .ndo_open = vlan_dev_open, 845 .ndo_stop = vlan_dev_stop, 846 .ndo_start_xmit = vlan_dev_hard_start_xmit, 847 .ndo_validate_addr = eth_validate_addr, 848 .ndo_set_mac_address = vlan_dev_set_mac_address, 849 .ndo_set_rx_mode = vlan_dev_set_rx_mode, 850 .ndo_set_multicast_list = vlan_dev_set_rx_mode, 851 .ndo_change_rx_flags = vlan_dev_change_rx_flags, 852 .ndo_do_ioctl = vlan_dev_ioctl, 853 .ndo_neigh_setup = vlan_dev_neigh_setup, 854 .ndo_get_stats64 = vlan_dev_get_stats64, 855 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 856 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup, 857 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done, 858 .ndo_fcoe_enable = vlan_dev_fcoe_enable, 859 .ndo_fcoe_disable = vlan_dev_fcoe_disable, 860 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn, 861 #endif 862 }; 863 864 void vlan_setup(struct net_device *dev) 865 { 866 ether_setup(dev); 867 868 dev->priv_flags |= IFF_802_1Q_VLAN; 869 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 870 dev->tx_queue_len = 0; 871 872 dev->netdev_ops = &vlan_netdev_ops; 873 dev->destructor = free_netdev; 874 dev->ethtool_ops = &vlan_ethtool_ops; 875 876 memset(dev->broadcast, 0, ETH_ALEN); 877 } 878