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_rx_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 = __find_vlan_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 = per_cpu_ptr(vlan_dev_info(skb->dev)->vlan_rx_stats, 181 smp_processor_id()); 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 rcu_read_unlock(); 230 return NET_RX_SUCCESS; 231 232 err_unlock: 233 rcu_read_unlock(); 234 err_free: 235 kfree_skb(skb); 236 return NET_RX_DROP; 237 } 238 239 static inline u16 240 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb) 241 { 242 struct vlan_priority_tci_mapping *mp; 243 244 mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)]; 245 while (mp) { 246 if (mp->priority == skb->priority) { 247 return mp->vlan_qos; /* This should already be shifted 248 * to mask correctly with the 249 * VLAN's TCI */ 250 } 251 mp = mp->next; 252 } 253 return 0; 254 } 255 256 /* 257 * Create the VLAN header for an arbitrary protocol layer 258 * 259 * saddr=NULL means use device source address 260 * daddr=NULL means leave destination address (eg unresolved arp) 261 * 262 * This is called when the SKB is moving down the stack towards the 263 * physical devices. 264 */ 265 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev, 266 unsigned short type, 267 const void *daddr, const void *saddr, 268 unsigned int len) 269 { 270 struct vlan_hdr *vhdr; 271 unsigned int vhdrlen = 0; 272 u16 vlan_tci = 0; 273 int rc; 274 275 if (WARN_ON(skb_headroom(skb) < dev->hard_header_len)) 276 return -ENOSPC; 277 278 if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR)) { 279 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN); 280 281 vlan_tci = vlan_dev_info(dev)->vlan_id; 282 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb); 283 vhdr->h_vlan_TCI = htons(vlan_tci); 284 285 /* 286 * Set the protocol type. For a packet of type ETH_P_802_3/2 we 287 * put the length in here instead. 288 */ 289 if (type != ETH_P_802_3 && type != ETH_P_802_2) 290 vhdr->h_vlan_encapsulated_proto = htons(type); 291 else 292 vhdr->h_vlan_encapsulated_proto = htons(len); 293 294 skb->protocol = htons(ETH_P_8021Q); 295 type = ETH_P_8021Q; 296 vhdrlen = VLAN_HLEN; 297 } 298 299 /* Before delegating work to the lower layer, enter our MAC-address */ 300 if (saddr == NULL) 301 saddr = dev->dev_addr; 302 303 /* Now make the underlying real hard header */ 304 dev = vlan_dev_info(dev)->real_dev; 305 rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen); 306 if (rc > 0) 307 rc += vhdrlen; 308 return rc; 309 } 310 311 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb, 312 struct net_device *dev) 313 { 314 int i = skb_get_queue_mapping(skb); 315 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 316 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data); 317 unsigned int len; 318 int ret; 319 320 /* Handle non-VLAN frames if they are sent to us, for example by DHCP. 321 * 322 * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING 323 * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs... 324 */ 325 if (veth->h_vlan_proto != htons(ETH_P_8021Q) || 326 vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) { 327 unsigned int orig_headroom = skb_headroom(skb); 328 u16 vlan_tci; 329 330 vlan_dev_info(dev)->cnt_encap_on_xmit++; 331 332 vlan_tci = vlan_dev_info(dev)->vlan_id; 333 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb); 334 skb = __vlan_put_tag(skb, vlan_tci); 335 if (!skb) { 336 txq->tx_dropped++; 337 return NETDEV_TX_OK; 338 } 339 340 if (orig_headroom < VLAN_HLEN) 341 vlan_dev_info(dev)->cnt_inc_headroom_on_tx++; 342 } 343 344 345 skb_set_dev(skb, vlan_dev_info(dev)->real_dev); 346 len = skb->len; 347 ret = dev_queue_xmit(skb); 348 349 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 350 txq->tx_packets++; 351 txq->tx_bytes += len; 352 } else 353 txq->tx_dropped++; 354 355 return ret; 356 } 357 358 static netdev_tx_t vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb, 359 struct net_device *dev) 360 { 361 int i = skb_get_queue_mapping(skb); 362 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 363 u16 vlan_tci; 364 unsigned int len; 365 int ret; 366 367 vlan_tci = vlan_dev_info(dev)->vlan_id; 368 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb); 369 skb = __vlan_hwaccel_put_tag(skb, vlan_tci); 370 371 skb->dev = vlan_dev_info(dev)->real_dev; 372 len = skb->len; 373 ret = dev_queue_xmit(skb); 374 375 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 376 txq->tx_packets++; 377 txq->tx_bytes += len; 378 } else 379 txq->tx_dropped++; 380 381 return ret; 382 } 383 384 static u16 vlan_dev_select_queue(struct net_device *dev, struct sk_buff *skb) 385 { 386 struct net_device *rdev = vlan_dev_info(dev)->real_dev; 387 const struct net_device_ops *ops = rdev->netdev_ops; 388 389 return ops->ndo_select_queue(rdev, skb); 390 } 391 392 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu) 393 { 394 /* TODO: gotta make sure the underlying layer can handle it, 395 * maybe an IFF_VLAN_CAPABLE flag for devices? 396 */ 397 if (vlan_dev_info(dev)->real_dev->mtu < new_mtu) 398 return -ERANGE; 399 400 dev->mtu = new_mtu; 401 402 return 0; 403 } 404 405 void vlan_dev_set_ingress_priority(const struct net_device *dev, 406 u32 skb_prio, u16 vlan_prio) 407 { 408 struct vlan_dev_info *vlan = vlan_dev_info(dev); 409 410 if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio) 411 vlan->nr_ingress_mappings--; 412 else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio) 413 vlan->nr_ingress_mappings++; 414 415 vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio; 416 } 417 418 int vlan_dev_set_egress_priority(const struct net_device *dev, 419 u32 skb_prio, u16 vlan_prio) 420 { 421 struct vlan_dev_info *vlan = vlan_dev_info(dev); 422 struct vlan_priority_tci_mapping *mp = NULL; 423 struct vlan_priority_tci_mapping *np; 424 u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK; 425 426 /* See if a priority mapping exists.. */ 427 mp = vlan->egress_priority_map[skb_prio & 0xF]; 428 while (mp) { 429 if (mp->priority == skb_prio) { 430 if (mp->vlan_qos && !vlan_qos) 431 vlan->nr_egress_mappings--; 432 else if (!mp->vlan_qos && vlan_qos) 433 vlan->nr_egress_mappings++; 434 mp->vlan_qos = vlan_qos; 435 return 0; 436 } 437 mp = mp->next; 438 } 439 440 /* Create a new mapping then. */ 441 mp = vlan->egress_priority_map[skb_prio & 0xF]; 442 np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL); 443 if (!np) 444 return -ENOBUFS; 445 446 np->next = mp; 447 np->priority = skb_prio; 448 np->vlan_qos = vlan_qos; 449 vlan->egress_priority_map[skb_prio & 0xF] = np; 450 if (vlan_qos) 451 vlan->nr_egress_mappings++; 452 return 0; 453 } 454 455 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */ 456 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask) 457 { 458 struct vlan_dev_info *vlan = vlan_dev_info(dev); 459 u32 old_flags = vlan->flags; 460 461 if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP | 462 VLAN_FLAG_LOOSE_BINDING)) 463 return -EINVAL; 464 465 vlan->flags = (old_flags & ~mask) | (flags & mask); 466 467 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) { 468 if (vlan->flags & VLAN_FLAG_GVRP) 469 vlan_gvrp_request_join(dev); 470 else 471 vlan_gvrp_request_leave(dev); 472 } 473 return 0; 474 } 475 476 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result) 477 { 478 strncpy(result, vlan_dev_info(dev)->real_dev->name, 23); 479 } 480 481 static int vlan_dev_open(struct net_device *dev) 482 { 483 struct vlan_dev_info *vlan = vlan_dev_info(dev); 484 struct net_device *real_dev = vlan->real_dev; 485 int err; 486 487 if (!(real_dev->flags & IFF_UP) && 488 !(vlan->flags & VLAN_FLAG_LOOSE_BINDING)) 489 return -ENETDOWN; 490 491 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) { 492 err = dev_uc_add(real_dev, dev->dev_addr); 493 if (err < 0) 494 goto out; 495 } 496 497 if (dev->flags & IFF_ALLMULTI) { 498 err = dev_set_allmulti(real_dev, 1); 499 if (err < 0) 500 goto del_unicast; 501 } 502 if (dev->flags & IFF_PROMISC) { 503 err = dev_set_promiscuity(real_dev, 1); 504 if (err < 0) 505 goto clear_allmulti; 506 } 507 508 memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN); 509 510 if (vlan->flags & VLAN_FLAG_GVRP) 511 vlan_gvrp_request_join(dev); 512 513 if (netif_carrier_ok(real_dev)) 514 netif_carrier_on(dev); 515 return 0; 516 517 clear_allmulti: 518 if (dev->flags & IFF_ALLMULTI) 519 dev_set_allmulti(real_dev, -1); 520 del_unicast: 521 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) 522 dev_uc_del(real_dev, dev->dev_addr); 523 out: 524 netif_carrier_off(dev); 525 return err; 526 } 527 528 static int vlan_dev_stop(struct net_device *dev) 529 { 530 struct vlan_dev_info *vlan = vlan_dev_info(dev); 531 struct net_device *real_dev = vlan->real_dev; 532 533 if (vlan->flags & VLAN_FLAG_GVRP) 534 vlan_gvrp_request_leave(dev); 535 536 dev_mc_unsync(real_dev, dev); 537 dev_uc_unsync(real_dev, dev); 538 if (dev->flags & IFF_ALLMULTI) 539 dev_set_allmulti(real_dev, -1); 540 if (dev->flags & IFF_PROMISC) 541 dev_set_promiscuity(real_dev, -1); 542 543 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) 544 dev_uc_del(real_dev, dev->dev_addr); 545 546 netif_carrier_off(dev); 547 return 0; 548 } 549 550 static int vlan_dev_set_mac_address(struct net_device *dev, void *p) 551 { 552 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 553 struct sockaddr *addr = p; 554 int err; 555 556 if (!is_valid_ether_addr(addr->sa_data)) 557 return -EADDRNOTAVAIL; 558 559 if (!(dev->flags & IFF_UP)) 560 goto out; 561 562 if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) { 563 err = dev_uc_add(real_dev, addr->sa_data); 564 if (err < 0) 565 return err; 566 } 567 568 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) 569 dev_uc_del(real_dev, dev->dev_addr); 570 571 out: 572 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); 573 return 0; 574 } 575 576 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 577 { 578 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 579 const struct net_device_ops *ops = real_dev->netdev_ops; 580 struct ifreq ifrr; 581 int err = -EOPNOTSUPP; 582 583 strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ); 584 ifrr.ifr_ifru = ifr->ifr_ifru; 585 586 switch (cmd) { 587 case SIOCGMIIPHY: 588 case SIOCGMIIREG: 589 case SIOCSMIIREG: 590 if (netif_device_present(real_dev) && ops->ndo_do_ioctl) 591 err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd); 592 break; 593 } 594 595 if (!err) 596 ifr->ifr_ifru = ifrr.ifr_ifru; 597 598 return err; 599 } 600 601 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa) 602 { 603 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 604 const struct net_device_ops *ops = real_dev->netdev_ops; 605 int err = 0; 606 607 if (netif_device_present(real_dev) && ops->ndo_neigh_setup) 608 err = ops->ndo_neigh_setup(real_dev, pa); 609 610 return err; 611 } 612 613 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 614 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid, 615 struct scatterlist *sgl, unsigned int sgc) 616 { 617 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 618 const struct net_device_ops *ops = real_dev->netdev_ops; 619 int rc = 0; 620 621 if (ops->ndo_fcoe_ddp_setup) 622 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc); 623 624 return rc; 625 } 626 627 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid) 628 { 629 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 630 const struct net_device_ops *ops = real_dev->netdev_ops; 631 int len = 0; 632 633 if (ops->ndo_fcoe_ddp_done) 634 len = ops->ndo_fcoe_ddp_done(real_dev, xid); 635 636 return len; 637 } 638 639 static int vlan_dev_fcoe_enable(struct net_device *dev) 640 { 641 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 642 const struct net_device_ops *ops = real_dev->netdev_ops; 643 int rc = -EINVAL; 644 645 if (ops->ndo_fcoe_enable) 646 rc = ops->ndo_fcoe_enable(real_dev); 647 return rc; 648 } 649 650 static int vlan_dev_fcoe_disable(struct net_device *dev) 651 { 652 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 653 const struct net_device_ops *ops = real_dev->netdev_ops; 654 int rc = -EINVAL; 655 656 if (ops->ndo_fcoe_disable) 657 rc = ops->ndo_fcoe_disable(real_dev); 658 return rc; 659 } 660 661 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type) 662 { 663 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 664 const struct net_device_ops *ops = real_dev->netdev_ops; 665 int rc = -EINVAL; 666 667 if (ops->ndo_fcoe_get_wwn) 668 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type); 669 return rc; 670 } 671 #endif 672 673 static void vlan_dev_change_rx_flags(struct net_device *dev, int change) 674 { 675 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 676 677 if (change & IFF_ALLMULTI) 678 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 679 if (change & IFF_PROMISC) 680 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1); 681 } 682 683 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev) 684 { 685 dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev); 686 dev_uc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev); 687 } 688 689 /* 690 * vlan network devices have devices nesting below it, and are a special 691 * "super class" of normal network devices; split their locks off into a 692 * separate class since they always nest. 693 */ 694 static struct lock_class_key vlan_netdev_xmit_lock_key; 695 static struct lock_class_key vlan_netdev_addr_lock_key; 696 697 static void vlan_dev_set_lockdep_one(struct net_device *dev, 698 struct netdev_queue *txq, 699 void *_subclass) 700 { 701 lockdep_set_class_and_subclass(&txq->_xmit_lock, 702 &vlan_netdev_xmit_lock_key, 703 *(int *)_subclass); 704 } 705 706 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass) 707 { 708 lockdep_set_class_and_subclass(&dev->addr_list_lock, 709 &vlan_netdev_addr_lock_key, 710 subclass); 711 netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass); 712 } 713 714 static const struct header_ops vlan_header_ops = { 715 .create = vlan_dev_hard_header, 716 .rebuild = vlan_dev_rebuild_header, 717 .parse = eth_header_parse, 718 }; 719 720 static const struct net_device_ops vlan_netdev_ops, vlan_netdev_accel_ops, 721 vlan_netdev_ops_sq, vlan_netdev_accel_ops_sq; 722 723 static int vlan_dev_init(struct net_device *dev) 724 { 725 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 726 int subclass = 0; 727 728 netif_carrier_off(dev); 729 730 /* IFF_BROADCAST|IFF_MULTICAST; ??? */ 731 dev->flags = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | 732 IFF_MASTER | IFF_SLAVE); 733 dev->iflink = real_dev->ifindex; 734 dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) | 735 (1<<__LINK_STATE_DORMANT))) | 736 (1<<__LINK_STATE_PRESENT); 737 738 dev->features |= real_dev->features & real_dev->vlan_features; 739 dev->gso_max_size = real_dev->gso_max_size; 740 741 /* ipv6 shared card related stuff */ 742 dev->dev_id = real_dev->dev_id; 743 744 if (is_zero_ether_addr(dev->dev_addr)) 745 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len); 746 if (is_zero_ether_addr(dev->broadcast)) 747 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 748 749 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 750 dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid; 751 #endif 752 753 if (real_dev->features & NETIF_F_HW_VLAN_TX) { 754 dev->header_ops = real_dev->header_ops; 755 dev->hard_header_len = real_dev->hard_header_len; 756 if (real_dev->netdev_ops->ndo_select_queue) 757 dev->netdev_ops = &vlan_netdev_accel_ops_sq; 758 else 759 dev->netdev_ops = &vlan_netdev_accel_ops; 760 } else { 761 dev->header_ops = &vlan_header_ops; 762 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN; 763 if (real_dev->netdev_ops->ndo_select_queue) 764 dev->netdev_ops = &vlan_netdev_ops_sq; 765 else 766 dev->netdev_ops = &vlan_netdev_ops; 767 } 768 769 if (is_vlan_dev(real_dev)) 770 subclass = 1; 771 772 vlan_dev_set_lockdep_class(dev, subclass); 773 774 vlan_dev_info(dev)->vlan_rx_stats = alloc_percpu(struct vlan_rx_stats); 775 if (!vlan_dev_info(dev)->vlan_rx_stats) 776 return -ENOMEM; 777 778 return 0; 779 } 780 781 static void vlan_dev_uninit(struct net_device *dev) 782 { 783 struct vlan_priority_tci_mapping *pm; 784 struct vlan_dev_info *vlan = vlan_dev_info(dev); 785 int i; 786 787 free_percpu(vlan->vlan_rx_stats); 788 vlan->vlan_rx_stats = NULL; 789 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { 790 while ((pm = vlan->egress_priority_map[i]) != NULL) { 791 vlan->egress_priority_map[i] = pm->next; 792 kfree(pm); 793 } 794 } 795 } 796 797 static int vlan_ethtool_get_settings(struct net_device *dev, 798 struct ethtool_cmd *cmd) 799 { 800 const struct vlan_dev_info *vlan = vlan_dev_info(dev); 801 return dev_ethtool_get_settings(vlan->real_dev, cmd); 802 } 803 804 static void vlan_ethtool_get_drvinfo(struct net_device *dev, 805 struct ethtool_drvinfo *info) 806 { 807 strcpy(info->driver, vlan_fullname); 808 strcpy(info->version, vlan_version); 809 strcpy(info->fw_version, "N/A"); 810 } 811 812 static u32 vlan_ethtool_get_rx_csum(struct net_device *dev) 813 { 814 const struct vlan_dev_info *vlan = vlan_dev_info(dev); 815 return dev_ethtool_get_rx_csum(vlan->real_dev); 816 } 817 818 static u32 vlan_ethtool_get_flags(struct net_device *dev) 819 { 820 const struct vlan_dev_info *vlan = vlan_dev_info(dev); 821 return dev_ethtool_get_flags(vlan->real_dev); 822 } 823 824 static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) 825 { 826 dev_txq_stats_fold(dev, stats); 827 828 if (vlan_dev_info(dev)->vlan_rx_stats) { 829 struct vlan_rx_stats *p, accum = {0}; 830 int i; 831 832 for_each_possible_cpu(i) { 833 u64 rxpackets, rxbytes, rxmulticast; 834 unsigned int start; 835 836 p = per_cpu_ptr(vlan_dev_info(dev)->vlan_rx_stats, i); 837 do { 838 start = u64_stats_fetch_begin_bh(&p->syncp); 839 rxpackets = p->rx_packets; 840 rxbytes = p->rx_bytes; 841 rxmulticast = p->rx_multicast; 842 } while (u64_stats_fetch_retry_bh(&p->syncp, start)); 843 accum.rx_packets += rxpackets; 844 accum.rx_bytes += rxbytes; 845 accum.rx_multicast += rxmulticast; 846 /* rx_errors is an ulong, not protected by syncp */ 847 accum.rx_errors += p->rx_errors; 848 } 849 stats->rx_packets = accum.rx_packets; 850 stats->rx_bytes = accum.rx_bytes; 851 stats->rx_errors = accum.rx_errors; 852 stats->multicast = accum.rx_multicast; 853 } 854 return stats; 855 } 856 857 static int vlan_ethtool_set_tso(struct net_device *dev, u32 data) 858 { 859 if (data) { 860 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 861 862 /* Underlying device must support TSO for VLAN-tagged packets 863 * and must have TSO enabled now. 864 */ 865 if (!(real_dev->vlan_features & NETIF_F_TSO)) 866 return -EOPNOTSUPP; 867 if (!(real_dev->features & NETIF_F_TSO)) 868 return -EINVAL; 869 dev->features |= NETIF_F_TSO; 870 } else { 871 dev->features &= ~NETIF_F_TSO; 872 } 873 return 0; 874 } 875 876 static const struct ethtool_ops vlan_ethtool_ops = { 877 .get_settings = vlan_ethtool_get_settings, 878 .get_drvinfo = vlan_ethtool_get_drvinfo, 879 .get_link = ethtool_op_get_link, 880 .get_rx_csum = vlan_ethtool_get_rx_csum, 881 .get_flags = vlan_ethtool_get_flags, 882 .set_tso = vlan_ethtool_set_tso, 883 }; 884 885 static const struct net_device_ops vlan_netdev_ops = { 886 .ndo_change_mtu = vlan_dev_change_mtu, 887 .ndo_init = vlan_dev_init, 888 .ndo_uninit = vlan_dev_uninit, 889 .ndo_open = vlan_dev_open, 890 .ndo_stop = vlan_dev_stop, 891 .ndo_start_xmit = vlan_dev_hard_start_xmit, 892 .ndo_validate_addr = eth_validate_addr, 893 .ndo_set_mac_address = vlan_dev_set_mac_address, 894 .ndo_set_rx_mode = vlan_dev_set_rx_mode, 895 .ndo_set_multicast_list = vlan_dev_set_rx_mode, 896 .ndo_change_rx_flags = vlan_dev_change_rx_flags, 897 .ndo_do_ioctl = vlan_dev_ioctl, 898 .ndo_neigh_setup = vlan_dev_neigh_setup, 899 .ndo_get_stats64 = vlan_dev_get_stats64, 900 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 901 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup, 902 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done, 903 .ndo_fcoe_enable = vlan_dev_fcoe_enable, 904 .ndo_fcoe_disable = vlan_dev_fcoe_disable, 905 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn, 906 #endif 907 }; 908 909 static const struct net_device_ops vlan_netdev_accel_ops = { 910 .ndo_change_mtu = vlan_dev_change_mtu, 911 .ndo_init = vlan_dev_init, 912 .ndo_uninit = vlan_dev_uninit, 913 .ndo_open = vlan_dev_open, 914 .ndo_stop = vlan_dev_stop, 915 .ndo_start_xmit = vlan_dev_hwaccel_hard_start_xmit, 916 .ndo_validate_addr = eth_validate_addr, 917 .ndo_set_mac_address = vlan_dev_set_mac_address, 918 .ndo_set_rx_mode = vlan_dev_set_rx_mode, 919 .ndo_set_multicast_list = vlan_dev_set_rx_mode, 920 .ndo_change_rx_flags = vlan_dev_change_rx_flags, 921 .ndo_do_ioctl = vlan_dev_ioctl, 922 .ndo_neigh_setup = vlan_dev_neigh_setup, 923 .ndo_get_stats64 = vlan_dev_get_stats64, 924 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 925 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup, 926 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done, 927 .ndo_fcoe_enable = vlan_dev_fcoe_enable, 928 .ndo_fcoe_disable = vlan_dev_fcoe_disable, 929 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn, 930 #endif 931 }; 932 933 static const struct net_device_ops vlan_netdev_ops_sq = { 934 .ndo_select_queue = vlan_dev_select_queue, 935 .ndo_change_mtu = vlan_dev_change_mtu, 936 .ndo_init = vlan_dev_init, 937 .ndo_uninit = vlan_dev_uninit, 938 .ndo_open = vlan_dev_open, 939 .ndo_stop = vlan_dev_stop, 940 .ndo_start_xmit = vlan_dev_hard_start_xmit, 941 .ndo_validate_addr = eth_validate_addr, 942 .ndo_set_mac_address = vlan_dev_set_mac_address, 943 .ndo_set_rx_mode = vlan_dev_set_rx_mode, 944 .ndo_set_multicast_list = vlan_dev_set_rx_mode, 945 .ndo_change_rx_flags = vlan_dev_change_rx_flags, 946 .ndo_do_ioctl = vlan_dev_ioctl, 947 .ndo_neigh_setup = vlan_dev_neigh_setup, 948 .ndo_get_stats64 = vlan_dev_get_stats64, 949 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 950 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup, 951 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done, 952 .ndo_fcoe_enable = vlan_dev_fcoe_enable, 953 .ndo_fcoe_disable = vlan_dev_fcoe_disable, 954 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn, 955 #endif 956 }; 957 958 static const struct net_device_ops vlan_netdev_accel_ops_sq = { 959 .ndo_select_queue = vlan_dev_select_queue, 960 .ndo_change_mtu = vlan_dev_change_mtu, 961 .ndo_init = vlan_dev_init, 962 .ndo_uninit = vlan_dev_uninit, 963 .ndo_open = vlan_dev_open, 964 .ndo_stop = vlan_dev_stop, 965 .ndo_start_xmit = vlan_dev_hwaccel_hard_start_xmit, 966 .ndo_validate_addr = eth_validate_addr, 967 .ndo_set_mac_address = vlan_dev_set_mac_address, 968 .ndo_set_rx_mode = vlan_dev_set_rx_mode, 969 .ndo_set_multicast_list = vlan_dev_set_rx_mode, 970 .ndo_change_rx_flags = vlan_dev_change_rx_flags, 971 .ndo_do_ioctl = vlan_dev_ioctl, 972 .ndo_neigh_setup = vlan_dev_neigh_setup, 973 .ndo_get_stats64 = vlan_dev_get_stats64, 974 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 975 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup, 976 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done, 977 .ndo_fcoe_enable = vlan_dev_fcoe_enable, 978 .ndo_fcoe_disable = vlan_dev_fcoe_disable, 979 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn, 980 #endif 981 }; 982 983 void vlan_setup(struct net_device *dev) 984 { 985 ether_setup(dev); 986 987 dev->priv_flags |= IFF_802_1Q_VLAN; 988 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 989 dev->tx_queue_len = 0; 990 991 dev->netdev_ops = &vlan_netdev_ops; 992 dev->destructor = free_netdev; 993 dev->ethtool_ops = &vlan_ethtool_ops; 994 995 memset(dev->broadcast, 0, ETH_ALEN); 996 } 997