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/skbuff.h> 25 #include <linux/netdevice.h> 26 #include <linux/etherdevice.h> 27 #include <linux/ethtool.h> 28 #include <net/arp.h> 29 30 #include "vlan.h" 31 #include "vlanproc.h" 32 #include <linux/if_vlan.h> 33 34 /* 35 * Rebuild the Ethernet MAC header. This is called after an ARP 36 * (or in future other address resolution) has completed on this 37 * sk_buff. We now let ARP fill in the other fields. 38 * 39 * This routine CANNOT use cached dst->neigh! 40 * Really, it is used only when dst->neigh is wrong. 41 * 42 * TODO: This needs a checkup, I'm ignorant here. --BLG 43 */ 44 static int vlan_dev_rebuild_header(struct sk_buff *skb) 45 { 46 struct net_device *dev = skb->dev; 47 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data); 48 49 switch (veth->h_vlan_encapsulated_proto) { 50 #ifdef CONFIG_INET 51 case htons(ETH_P_IP): 52 53 /* TODO: Confirm this will work with VLAN headers... */ 54 return arp_find(veth->h_dest, skb); 55 #endif 56 default: 57 pr_debug("%s: unable to resolve type %X addresses.\n", 58 dev->name, ntohs(veth->h_vlan_encapsulated_proto)); 59 60 memcpy(veth->h_source, dev->dev_addr, ETH_ALEN); 61 break; 62 } 63 64 return 0; 65 } 66 67 static inline struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb) 68 { 69 if (vlan_dev_info(skb->dev)->flags & VLAN_FLAG_REORDER_HDR) { 70 if (skb_cow(skb, skb_headroom(skb)) < 0) 71 skb = NULL; 72 if (skb) { 73 /* Lifted from Gleb's VLAN code... */ 74 memmove(skb->data - ETH_HLEN, 75 skb->data - VLAN_ETH_HLEN, 12); 76 skb->mac_header += VLAN_HLEN; 77 } 78 } 79 80 return skb; 81 } 82 83 static inline void vlan_set_encap_proto(struct sk_buff *skb, 84 struct vlan_hdr *vhdr) 85 { 86 __be16 proto; 87 unsigned char *rawp; 88 89 /* 90 * Was a VLAN packet, grab the encapsulated protocol, which the layer 91 * three protocols care about. 92 */ 93 94 proto = vhdr->h_vlan_encapsulated_proto; 95 if (ntohs(proto) >= 1536) { 96 skb->protocol = proto; 97 return; 98 } 99 100 rawp = skb->data; 101 if (*(unsigned short *)rawp == 0xFFFF) 102 /* 103 * This is a magic hack to spot IPX packets. Older Novell 104 * breaks the protocol design and runs IPX over 802.3 without 105 * an 802.2 LLC layer. We look for FFFF which isn't a used 106 * 802.2 SSAP/DSAP. This won't work for fault tolerant netware 107 * but does for the rest. 108 */ 109 skb->protocol = htons(ETH_P_802_3); 110 else 111 /* 112 * Real 802.2 LLC 113 */ 114 skb->protocol = htons(ETH_P_802_2); 115 } 116 117 /* 118 * Determine the packet's protocol ID. The rule here is that we 119 * assume 802.3 if the type field is short enough to be a length. 120 * This is normal practice and works for any 'now in use' protocol. 121 * 122 * Also, at this point we assume that we ARE dealing exclusively with 123 * VLAN packets, or packets that should be made into VLAN packets based 124 * on a default VLAN ID. 125 * 126 * NOTE: Should be similar to ethernet/eth.c. 127 * 128 * SANITY NOTE: This method is called when a packet is moving up the stack 129 * towards userland. To get here, it would have already passed 130 * through the ethernet/eth.c eth_type_trans() method. 131 * SANITY NOTE 2: We are referencing to the VLAN_HDR frields, which MAY be 132 * stored UNALIGNED in the memory. RISC systems don't like 133 * such cases very much... 134 * SANITY NOTE 2a: According to Dave Miller & Alexey, it will always be 135 * aligned, so there doesn't need to be any of the unaligned 136 * stuff. It has been commented out now... --Ben 137 * 138 */ 139 int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev, 140 struct packet_type *ptype, struct net_device *orig_dev) 141 { 142 struct vlan_hdr *vhdr; 143 struct vlan_rx_stats *rx_stats; 144 u16 vlan_id; 145 u16 vlan_tci; 146 147 skb = skb_share_check(skb, GFP_ATOMIC); 148 if (skb == NULL) 149 goto err_free; 150 151 if (unlikely(!pskb_may_pull(skb, VLAN_HLEN))) 152 goto err_free; 153 154 vhdr = (struct vlan_hdr *)skb->data; 155 vlan_tci = ntohs(vhdr->h_vlan_TCI); 156 vlan_id = vlan_tci & VLAN_VID_MASK; 157 158 rcu_read_lock(); 159 skb->dev = __find_vlan_dev(dev, vlan_id); 160 if (!skb->dev) { 161 pr_debug("%s: ERROR: No net_device for VID: %u on dev: %s\n", 162 __func__, vlan_id, dev->name); 163 goto err_unlock; 164 } 165 166 rx_stats = per_cpu_ptr(vlan_dev_info(skb->dev)->vlan_rx_stats, 167 smp_processor_id()); 168 rx_stats->rx_packets++; 169 rx_stats->rx_bytes += skb->len; 170 171 skb_pull_rcsum(skb, VLAN_HLEN); 172 173 skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tci); 174 175 pr_debug("%s: priority: %u for TCI: %hu\n", 176 __func__, skb->priority, vlan_tci); 177 178 switch (skb->pkt_type) { 179 case PACKET_BROADCAST: /* Yeah, stats collect these together.. */ 180 /* stats->broadcast ++; // no such counter :-( */ 181 break; 182 183 case PACKET_MULTICAST: 184 rx_stats->multicast++; 185 break; 186 187 case PACKET_OTHERHOST: 188 /* Our lower layer thinks this is not local, let's make sure. 189 * This allows the VLAN to have a different MAC than the 190 * underlying device, and still route correctly. 191 */ 192 if (!compare_ether_addr(eth_hdr(skb)->h_dest, 193 skb->dev->dev_addr)) 194 skb->pkt_type = PACKET_HOST; 195 break; 196 default: 197 break; 198 } 199 200 vlan_set_encap_proto(skb, vhdr); 201 202 skb = vlan_check_reorder_header(skb); 203 if (!skb) { 204 rx_stats->rx_errors++; 205 goto err_unlock; 206 } 207 208 netif_rx(skb); 209 rcu_read_unlock(); 210 return NET_RX_SUCCESS; 211 212 err_unlock: 213 rcu_read_unlock(); 214 err_free: 215 kfree_skb(skb); 216 return NET_RX_DROP; 217 } 218 219 static inline u16 220 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb) 221 { 222 struct vlan_priority_tci_mapping *mp; 223 224 mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)]; 225 while (mp) { 226 if (mp->priority == skb->priority) { 227 return mp->vlan_qos; /* This should already be shifted 228 * to mask correctly with the 229 * VLAN's TCI */ 230 } 231 mp = mp->next; 232 } 233 return 0; 234 } 235 236 /* 237 * Create the VLAN header for an arbitrary protocol layer 238 * 239 * saddr=NULL means use device source address 240 * daddr=NULL means leave destination address (eg unresolved arp) 241 * 242 * This is called when the SKB is moving down the stack towards the 243 * physical devices. 244 */ 245 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev, 246 unsigned short type, 247 const void *daddr, const void *saddr, 248 unsigned int len) 249 { 250 struct vlan_hdr *vhdr; 251 unsigned int vhdrlen = 0; 252 u16 vlan_tci = 0; 253 int rc; 254 255 if (WARN_ON(skb_headroom(skb) < dev->hard_header_len)) 256 return -ENOSPC; 257 258 if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR)) { 259 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN); 260 261 vlan_tci = vlan_dev_info(dev)->vlan_id; 262 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb); 263 vhdr->h_vlan_TCI = htons(vlan_tci); 264 265 /* 266 * Set the protocol type. For a packet of type ETH_P_802_3 we 267 * put the length in here instead. It is up to the 802.2 268 * layer to carry protocol information. 269 */ 270 if (type != ETH_P_802_3) 271 vhdr->h_vlan_encapsulated_proto = htons(type); 272 else 273 vhdr->h_vlan_encapsulated_proto = htons(len); 274 275 skb->protocol = htons(ETH_P_8021Q); 276 type = ETH_P_8021Q; 277 vhdrlen = VLAN_HLEN; 278 } 279 280 /* Before delegating work to the lower layer, enter our MAC-address */ 281 if (saddr == NULL) 282 saddr = dev->dev_addr; 283 284 /* Now make the underlying real hard header */ 285 dev = vlan_dev_info(dev)->real_dev; 286 rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen); 287 if (rc > 0) 288 rc += vhdrlen; 289 return rc; 290 } 291 292 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb, 293 struct net_device *dev) 294 { 295 int i = skb_get_queue_mapping(skb); 296 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 297 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data); 298 unsigned int len; 299 int ret; 300 301 /* Handle non-VLAN frames if they are sent to us, for example by DHCP. 302 * 303 * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING 304 * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs... 305 */ 306 if (veth->h_vlan_proto != htons(ETH_P_8021Q) || 307 vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) { 308 unsigned int orig_headroom = skb_headroom(skb); 309 u16 vlan_tci; 310 311 vlan_dev_info(dev)->cnt_encap_on_xmit++; 312 313 vlan_tci = vlan_dev_info(dev)->vlan_id; 314 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb); 315 skb = __vlan_put_tag(skb, vlan_tci); 316 if (!skb) { 317 txq->tx_dropped++; 318 return NETDEV_TX_OK; 319 } 320 321 if (orig_headroom < VLAN_HLEN) 322 vlan_dev_info(dev)->cnt_inc_headroom_on_tx++; 323 } 324 325 326 skb->dev = vlan_dev_info(dev)->real_dev; 327 len = skb->len; 328 ret = dev_queue_xmit(skb); 329 330 if (likely(ret == NET_XMIT_SUCCESS)) { 331 txq->tx_packets++; 332 txq->tx_bytes += len; 333 } else 334 txq->tx_dropped++; 335 336 return ret; 337 } 338 339 static netdev_tx_t vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb, 340 struct net_device *dev) 341 { 342 int i = skb_get_queue_mapping(skb); 343 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 344 u16 vlan_tci; 345 unsigned int len; 346 int ret; 347 348 vlan_tci = vlan_dev_info(dev)->vlan_id; 349 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb); 350 skb = __vlan_hwaccel_put_tag(skb, vlan_tci); 351 352 skb->dev = vlan_dev_info(dev)->real_dev; 353 len = skb->len; 354 ret = dev_queue_xmit(skb); 355 356 if (likely(ret == NET_XMIT_SUCCESS)) { 357 txq->tx_packets++; 358 txq->tx_bytes += len; 359 } else 360 txq->tx_dropped++; 361 362 return ret; 363 } 364 365 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu) 366 { 367 /* TODO: gotta make sure the underlying layer can handle it, 368 * maybe an IFF_VLAN_CAPABLE flag for devices? 369 */ 370 if (vlan_dev_info(dev)->real_dev->mtu < new_mtu) 371 return -ERANGE; 372 373 dev->mtu = new_mtu; 374 375 return 0; 376 } 377 378 void vlan_dev_set_ingress_priority(const struct net_device *dev, 379 u32 skb_prio, u16 vlan_prio) 380 { 381 struct vlan_dev_info *vlan = vlan_dev_info(dev); 382 383 if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio) 384 vlan->nr_ingress_mappings--; 385 else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio) 386 vlan->nr_ingress_mappings++; 387 388 vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio; 389 } 390 391 int vlan_dev_set_egress_priority(const struct net_device *dev, 392 u32 skb_prio, u16 vlan_prio) 393 { 394 struct vlan_dev_info *vlan = vlan_dev_info(dev); 395 struct vlan_priority_tci_mapping *mp = NULL; 396 struct vlan_priority_tci_mapping *np; 397 u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK; 398 399 /* See if a priority mapping exists.. */ 400 mp = vlan->egress_priority_map[skb_prio & 0xF]; 401 while (mp) { 402 if (mp->priority == skb_prio) { 403 if (mp->vlan_qos && !vlan_qos) 404 vlan->nr_egress_mappings--; 405 else if (!mp->vlan_qos && vlan_qos) 406 vlan->nr_egress_mappings++; 407 mp->vlan_qos = vlan_qos; 408 return 0; 409 } 410 mp = mp->next; 411 } 412 413 /* Create a new mapping then. */ 414 mp = vlan->egress_priority_map[skb_prio & 0xF]; 415 np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL); 416 if (!np) 417 return -ENOBUFS; 418 419 np->next = mp; 420 np->priority = skb_prio; 421 np->vlan_qos = vlan_qos; 422 vlan->egress_priority_map[skb_prio & 0xF] = np; 423 if (vlan_qos) 424 vlan->nr_egress_mappings++; 425 return 0; 426 } 427 428 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */ 429 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask) 430 { 431 struct vlan_dev_info *vlan = vlan_dev_info(dev); 432 u32 old_flags = vlan->flags; 433 434 if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP | 435 VLAN_FLAG_LOOSE_BINDING)) 436 return -EINVAL; 437 438 vlan->flags = (old_flags & ~mask) | (flags & mask); 439 440 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) { 441 if (vlan->flags & VLAN_FLAG_GVRP) 442 vlan_gvrp_request_join(dev); 443 else 444 vlan_gvrp_request_leave(dev); 445 } 446 return 0; 447 } 448 449 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result) 450 { 451 strncpy(result, vlan_dev_info(dev)->real_dev->name, 23); 452 } 453 454 static int vlan_dev_open(struct net_device *dev) 455 { 456 struct vlan_dev_info *vlan = vlan_dev_info(dev); 457 struct net_device *real_dev = vlan->real_dev; 458 int err; 459 460 if (!(real_dev->flags & IFF_UP) && 461 !(vlan->flags & VLAN_FLAG_LOOSE_BINDING)) 462 return -ENETDOWN; 463 464 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) { 465 err = dev_unicast_add(real_dev, dev->dev_addr); 466 if (err < 0) 467 goto out; 468 } 469 470 if (dev->flags & IFF_ALLMULTI) { 471 err = dev_set_allmulti(real_dev, 1); 472 if (err < 0) 473 goto del_unicast; 474 } 475 if (dev->flags & IFF_PROMISC) { 476 err = dev_set_promiscuity(real_dev, 1); 477 if (err < 0) 478 goto clear_allmulti; 479 } 480 481 memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN); 482 483 if (vlan->flags & VLAN_FLAG_GVRP) 484 vlan_gvrp_request_join(dev); 485 486 netif_carrier_on(dev); 487 return 0; 488 489 clear_allmulti: 490 if (dev->flags & IFF_ALLMULTI) 491 dev_set_allmulti(real_dev, -1); 492 del_unicast: 493 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) 494 dev_unicast_delete(real_dev, dev->dev_addr); 495 out: 496 netif_carrier_off(dev); 497 return err; 498 } 499 500 static int vlan_dev_stop(struct net_device *dev) 501 { 502 struct vlan_dev_info *vlan = vlan_dev_info(dev); 503 struct net_device *real_dev = vlan->real_dev; 504 505 if (vlan->flags & VLAN_FLAG_GVRP) 506 vlan_gvrp_request_leave(dev); 507 508 dev_mc_unsync(real_dev, dev); 509 dev_unicast_unsync(real_dev, dev); 510 if (dev->flags & IFF_ALLMULTI) 511 dev_set_allmulti(real_dev, -1); 512 if (dev->flags & IFF_PROMISC) 513 dev_set_promiscuity(real_dev, -1); 514 515 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) 516 dev_unicast_delete(real_dev, dev->dev_addr); 517 518 netif_carrier_off(dev); 519 return 0; 520 } 521 522 static int vlan_dev_set_mac_address(struct net_device *dev, void *p) 523 { 524 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 525 struct sockaddr *addr = p; 526 int err; 527 528 if (!is_valid_ether_addr(addr->sa_data)) 529 return -EADDRNOTAVAIL; 530 531 if (!(dev->flags & IFF_UP)) 532 goto out; 533 534 if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) { 535 err = dev_unicast_add(real_dev, addr->sa_data); 536 if (err < 0) 537 return err; 538 } 539 540 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) 541 dev_unicast_delete(real_dev, dev->dev_addr); 542 543 out: 544 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); 545 return 0; 546 } 547 548 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 549 { 550 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 551 const struct net_device_ops *ops = real_dev->netdev_ops; 552 struct ifreq ifrr; 553 int err = -EOPNOTSUPP; 554 555 strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ); 556 ifrr.ifr_ifru = ifr->ifr_ifru; 557 558 switch (cmd) { 559 case SIOCGMIIPHY: 560 case SIOCGMIIREG: 561 case SIOCSMIIREG: 562 if (netif_device_present(real_dev) && ops->ndo_do_ioctl) 563 err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd); 564 break; 565 } 566 567 if (!err) 568 ifr->ifr_ifru = ifrr.ifr_ifru; 569 570 return err; 571 } 572 573 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa) 574 { 575 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 576 const struct net_device_ops *ops = real_dev->netdev_ops; 577 int err = 0; 578 579 if (netif_device_present(real_dev) && ops->ndo_neigh_setup) 580 err = ops->ndo_neigh_setup(real_dev, pa); 581 582 return err; 583 } 584 585 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 586 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid, 587 struct scatterlist *sgl, unsigned int sgc) 588 { 589 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 590 const struct net_device_ops *ops = real_dev->netdev_ops; 591 int rc = 0; 592 593 if (ops->ndo_fcoe_ddp_setup) 594 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc); 595 596 return rc; 597 } 598 599 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid) 600 { 601 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 602 const struct net_device_ops *ops = real_dev->netdev_ops; 603 int len = 0; 604 605 if (ops->ndo_fcoe_ddp_done) 606 len = ops->ndo_fcoe_ddp_done(real_dev, xid); 607 608 return len; 609 } 610 611 static int vlan_dev_fcoe_enable(struct net_device *dev) 612 { 613 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 614 const struct net_device_ops *ops = real_dev->netdev_ops; 615 int rc = -EINVAL; 616 617 if (ops->ndo_fcoe_enable) 618 rc = ops->ndo_fcoe_enable(real_dev); 619 return rc; 620 } 621 622 static int vlan_dev_fcoe_disable(struct net_device *dev) 623 { 624 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 625 const struct net_device_ops *ops = real_dev->netdev_ops; 626 int rc = -EINVAL; 627 628 if (ops->ndo_fcoe_disable) 629 rc = ops->ndo_fcoe_disable(real_dev); 630 return rc; 631 } 632 633 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type) 634 { 635 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 636 const struct net_device_ops *ops = real_dev->netdev_ops; 637 int rc = -EINVAL; 638 639 if (ops->ndo_fcoe_get_wwn) 640 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type); 641 return rc; 642 } 643 #endif 644 645 static void vlan_dev_change_rx_flags(struct net_device *dev, int change) 646 { 647 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 648 649 if (change & IFF_ALLMULTI) 650 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 651 if (change & IFF_PROMISC) 652 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1); 653 } 654 655 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev) 656 { 657 dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev); 658 dev_unicast_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev); 659 } 660 661 /* 662 * vlan network devices have devices nesting below it, and are a special 663 * "super class" of normal network devices; split their locks off into a 664 * separate class since they always nest. 665 */ 666 static struct lock_class_key vlan_netdev_xmit_lock_key; 667 static struct lock_class_key vlan_netdev_addr_lock_key; 668 669 static void vlan_dev_set_lockdep_one(struct net_device *dev, 670 struct netdev_queue *txq, 671 void *_subclass) 672 { 673 lockdep_set_class_and_subclass(&txq->_xmit_lock, 674 &vlan_netdev_xmit_lock_key, 675 *(int *)_subclass); 676 } 677 678 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass) 679 { 680 lockdep_set_class_and_subclass(&dev->addr_list_lock, 681 &vlan_netdev_addr_lock_key, 682 subclass); 683 netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass); 684 } 685 686 static const struct header_ops vlan_header_ops = { 687 .create = vlan_dev_hard_header, 688 .rebuild = vlan_dev_rebuild_header, 689 .parse = eth_header_parse, 690 }; 691 692 static const struct net_device_ops vlan_netdev_ops, vlan_netdev_accel_ops; 693 694 static int vlan_dev_init(struct net_device *dev) 695 { 696 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 697 int subclass = 0; 698 699 netif_carrier_off(dev); 700 701 /* IFF_BROADCAST|IFF_MULTICAST; ??? */ 702 dev->flags = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI); 703 dev->iflink = real_dev->ifindex; 704 dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) | 705 (1<<__LINK_STATE_DORMANT))) | 706 (1<<__LINK_STATE_PRESENT); 707 708 dev->features |= real_dev->features & real_dev->vlan_features; 709 dev->gso_max_size = real_dev->gso_max_size; 710 711 /* ipv6 shared card related stuff */ 712 dev->dev_id = real_dev->dev_id; 713 714 if (is_zero_ether_addr(dev->dev_addr)) 715 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len); 716 if (is_zero_ether_addr(dev->broadcast)) 717 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 718 719 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 720 dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid; 721 #endif 722 723 if (real_dev->features & NETIF_F_HW_VLAN_TX) { 724 dev->header_ops = real_dev->header_ops; 725 dev->hard_header_len = real_dev->hard_header_len; 726 dev->netdev_ops = &vlan_netdev_accel_ops; 727 } else { 728 dev->header_ops = &vlan_header_ops; 729 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN; 730 dev->netdev_ops = &vlan_netdev_ops; 731 } 732 733 if (is_vlan_dev(real_dev)) 734 subclass = 1; 735 736 vlan_dev_set_lockdep_class(dev, subclass); 737 738 vlan_dev_info(dev)->vlan_rx_stats = alloc_percpu(struct vlan_rx_stats); 739 if (!vlan_dev_info(dev)->vlan_rx_stats) 740 return -ENOMEM; 741 742 return 0; 743 } 744 745 static void vlan_dev_uninit(struct net_device *dev) 746 { 747 struct vlan_priority_tci_mapping *pm; 748 struct vlan_dev_info *vlan = vlan_dev_info(dev); 749 int i; 750 751 free_percpu(vlan->vlan_rx_stats); 752 vlan->vlan_rx_stats = NULL; 753 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { 754 while ((pm = vlan->egress_priority_map[i]) != NULL) { 755 vlan->egress_priority_map[i] = pm->next; 756 kfree(pm); 757 } 758 } 759 } 760 761 static int vlan_ethtool_get_settings(struct net_device *dev, 762 struct ethtool_cmd *cmd) 763 { 764 const struct vlan_dev_info *vlan = vlan_dev_info(dev); 765 return dev_ethtool_get_settings(vlan->real_dev, cmd); 766 } 767 768 static void vlan_ethtool_get_drvinfo(struct net_device *dev, 769 struct ethtool_drvinfo *info) 770 { 771 strcpy(info->driver, vlan_fullname); 772 strcpy(info->version, vlan_version); 773 strcpy(info->fw_version, "N/A"); 774 } 775 776 static u32 vlan_ethtool_get_rx_csum(struct net_device *dev) 777 { 778 const struct vlan_dev_info *vlan = vlan_dev_info(dev); 779 return dev_ethtool_get_rx_csum(vlan->real_dev); 780 } 781 782 static u32 vlan_ethtool_get_flags(struct net_device *dev) 783 { 784 const struct vlan_dev_info *vlan = vlan_dev_info(dev); 785 return dev_ethtool_get_flags(vlan->real_dev); 786 } 787 788 static struct net_device_stats *vlan_dev_get_stats(struct net_device *dev) 789 { 790 struct net_device_stats *stats = &dev->stats; 791 792 dev_txq_stats_fold(dev, stats); 793 794 if (vlan_dev_info(dev)->vlan_rx_stats) { 795 struct vlan_rx_stats *p, rx = {0}; 796 int i; 797 798 for_each_possible_cpu(i) { 799 p = per_cpu_ptr(vlan_dev_info(dev)->vlan_rx_stats, i); 800 rx.rx_packets += p->rx_packets; 801 rx.rx_bytes += p->rx_bytes; 802 rx.rx_errors += p->rx_errors; 803 rx.multicast += p->multicast; 804 } 805 stats->rx_packets = rx.rx_packets; 806 stats->rx_bytes = rx.rx_bytes; 807 stats->rx_errors = rx.rx_errors; 808 stats->multicast = rx.multicast; 809 } 810 return stats; 811 } 812 813 static const struct ethtool_ops vlan_ethtool_ops = { 814 .get_settings = vlan_ethtool_get_settings, 815 .get_drvinfo = vlan_ethtool_get_drvinfo, 816 .get_link = ethtool_op_get_link, 817 .get_rx_csum = vlan_ethtool_get_rx_csum, 818 .get_flags = vlan_ethtool_get_flags, 819 }; 820 821 static const struct net_device_ops vlan_netdev_ops = { 822 .ndo_change_mtu = vlan_dev_change_mtu, 823 .ndo_init = vlan_dev_init, 824 .ndo_uninit = vlan_dev_uninit, 825 .ndo_open = vlan_dev_open, 826 .ndo_stop = vlan_dev_stop, 827 .ndo_start_xmit = vlan_dev_hard_start_xmit, 828 .ndo_validate_addr = eth_validate_addr, 829 .ndo_set_mac_address = vlan_dev_set_mac_address, 830 .ndo_set_rx_mode = vlan_dev_set_rx_mode, 831 .ndo_set_multicast_list = vlan_dev_set_rx_mode, 832 .ndo_change_rx_flags = vlan_dev_change_rx_flags, 833 .ndo_do_ioctl = vlan_dev_ioctl, 834 .ndo_neigh_setup = vlan_dev_neigh_setup, 835 .ndo_get_stats = vlan_dev_get_stats, 836 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 837 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup, 838 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done, 839 .ndo_fcoe_enable = vlan_dev_fcoe_enable, 840 .ndo_fcoe_disable = vlan_dev_fcoe_disable, 841 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn, 842 #endif 843 }; 844 845 static const struct net_device_ops vlan_netdev_accel_ops = { 846 .ndo_change_mtu = vlan_dev_change_mtu, 847 .ndo_init = vlan_dev_init, 848 .ndo_uninit = vlan_dev_uninit, 849 .ndo_open = vlan_dev_open, 850 .ndo_stop = vlan_dev_stop, 851 .ndo_start_xmit = vlan_dev_hwaccel_hard_start_xmit, 852 .ndo_validate_addr = eth_validate_addr, 853 .ndo_set_mac_address = vlan_dev_set_mac_address, 854 .ndo_set_rx_mode = vlan_dev_set_rx_mode, 855 .ndo_set_multicast_list = vlan_dev_set_rx_mode, 856 .ndo_change_rx_flags = vlan_dev_change_rx_flags, 857 .ndo_do_ioctl = vlan_dev_ioctl, 858 .ndo_neigh_setup = vlan_dev_neigh_setup, 859 .ndo_get_stats = vlan_dev_get_stats, 860 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 861 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup, 862 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done, 863 .ndo_fcoe_enable = vlan_dev_fcoe_enable, 864 .ndo_fcoe_disable = vlan_dev_fcoe_disable, 865 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn, 866 #endif 867 }; 868 869 void vlan_setup(struct net_device *dev) 870 { 871 ether_setup(dev); 872 873 dev->priv_flags |= IFF_802_1Q_VLAN; 874 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 875 dev->tx_queue_len = 0; 876 877 dev->netdev_ops = &vlan_netdev_ops; 878 dev->destructor = free_netdev; 879 dev->ethtool_ops = &vlan_ethtool_ops; 880 881 memset(dev->broadcast, 0, ETH_ALEN); 882 } 883