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 = 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_rx_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 (WARN_ON(skb_headroom(skb) < dev->hard_header_len)) 278 return -ENOSPC; 279 280 if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR)) { 281 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN); 282 283 vlan_tci = vlan_dev_info(dev)->vlan_id; 284 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb); 285 vhdr->h_vlan_TCI = htons(vlan_tci); 286 287 /* 288 * Set the protocol type. For a packet of type ETH_P_802_3/2 we 289 * put the length in here instead. 290 */ 291 if (type != ETH_P_802_3 && type != ETH_P_802_2) 292 vhdr->h_vlan_encapsulated_proto = htons(type); 293 else 294 vhdr->h_vlan_encapsulated_proto = htons(len); 295 296 skb->protocol = htons(ETH_P_8021Q); 297 type = ETH_P_8021Q; 298 vhdrlen = VLAN_HLEN; 299 } 300 301 /* Before delegating work to the lower layer, enter our MAC-address */ 302 if (saddr == NULL) 303 saddr = dev->dev_addr; 304 305 /* Now make the underlying real hard header */ 306 dev = vlan_dev_info(dev)->real_dev; 307 rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen); 308 if (rc > 0) 309 rc += vhdrlen; 310 return rc; 311 } 312 313 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb, 314 struct net_device *dev) 315 { 316 int i = skb_get_queue_mapping(skb); 317 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 318 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data); 319 unsigned int len; 320 int ret; 321 322 /* Handle non-VLAN frames if they are sent to us, for example by DHCP. 323 * 324 * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING 325 * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs... 326 */ 327 if (veth->h_vlan_proto != htons(ETH_P_8021Q) || 328 vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) { 329 unsigned int orig_headroom = skb_headroom(skb); 330 u16 vlan_tci; 331 332 vlan_dev_info(dev)->cnt_encap_on_xmit++; 333 334 vlan_tci = vlan_dev_info(dev)->vlan_id; 335 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb); 336 skb = __vlan_put_tag(skb, vlan_tci); 337 if (!skb) { 338 txq->tx_dropped++; 339 return NETDEV_TX_OK; 340 } 341 342 if (orig_headroom < VLAN_HLEN) 343 vlan_dev_info(dev)->cnt_inc_headroom_on_tx++; 344 } 345 346 347 skb_set_dev(skb, vlan_dev_info(dev)->real_dev); 348 len = skb->len; 349 ret = dev_queue_xmit(skb); 350 351 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 352 txq->tx_packets++; 353 txq->tx_bytes += len; 354 } else 355 txq->tx_dropped++; 356 357 return ret; 358 } 359 360 static netdev_tx_t vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb, 361 struct net_device *dev) 362 { 363 int i = skb_get_queue_mapping(skb); 364 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 365 u16 vlan_tci; 366 unsigned int len; 367 int ret; 368 369 vlan_tci = vlan_dev_info(dev)->vlan_id; 370 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb); 371 skb = __vlan_hwaccel_put_tag(skb, vlan_tci); 372 373 skb->dev = vlan_dev_info(dev)->real_dev; 374 len = skb->len; 375 ret = dev_queue_xmit(skb); 376 377 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 378 txq->tx_packets++; 379 txq->tx_bytes += len; 380 } else 381 txq->tx_dropped++; 382 383 return ret; 384 } 385 386 static u16 vlan_dev_select_queue(struct net_device *dev, struct sk_buff *skb) 387 { 388 struct net_device *rdev = vlan_dev_info(dev)->real_dev; 389 const struct net_device_ops *ops = rdev->netdev_ops; 390 391 return ops->ndo_select_queue(rdev, skb); 392 } 393 394 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu) 395 { 396 /* TODO: gotta make sure the underlying layer can handle it, 397 * maybe an IFF_VLAN_CAPABLE flag for devices? 398 */ 399 if (vlan_dev_info(dev)->real_dev->mtu < new_mtu) 400 return -ERANGE; 401 402 dev->mtu = new_mtu; 403 404 return 0; 405 } 406 407 void vlan_dev_set_ingress_priority(const struct net_device *dev, 408 u32 skb_prio, u16 vlan_prio) 409 { 410 struct vlan_dev_info *vlan = vlan_dev_info(dev); 411 412 if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio) 413 vlan->nr_ingress_mappings--; 414 else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio) 415 vlan->nr_ingress_mappings++; 416 417 vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio; 418 } 419 420 int vlan_dev_set_egress_priority(const struct net_device *dev, 421 u32 skb_prio, u16 vlan_prio) 422 { 423 struct vlan_dev_info *vlan = vlan_dev_info(dev); 424 struct vlan_priority_tci_mapping *mp = NULL; 425 struct vlan_priority_tci_mapping *np; 426 u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK; 427 428 /* See if a priority mapping exists.. */ 429 mp = vlan->egress_priority_map[skb_prio & 0xF]; 430 while (mp) { 431 if (mp->priority == skb_prio) { 432 if (mp->vlan_qos && !vlan_qos) 433 vlan->nr_egress_mappings--; 434 else if (!mp->vlan_qos && vlan_qos) 435 vlan->nr_egress_mappings++; 436 mp->vlan_qos = vlan_qos; 437 return 0; 438 } 439 mp = mp->next; 440 } 441 442 /* Create a new mapping then. */ 443 mp = vlan->egress_priority_map[skb_prio & 0xF]; 444 np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL); 445 if (!np) 446 return -ENOBUFS; 447 448 np->next = mp; 449 np->priority = skb_prio; 450 np->vlan_qos = vlan_qos; 451 vlan->egress_priority_map[skb_prio & 0xF] = np; 452 if (vlan_qos) 453 vlan->nr_egress_mappings++; 454 return 0; 455 } 456 457 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */ 458 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask) 459 { 460 struct vlan_dev_info *vlan = vlan_dev_info(dev); 461 u32 old_flags = vlan->flags; 462 463 if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP | 464 VLAN_FLAG_LOOSE_BINDING)) 465 return -EINVAL; 466 467 vlan->flags = (old_flags & ~mask) | (flags & mask); 468 469 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) { 470 if (vlan->flags & VLAN_FLAG_GVRP) 471 vlan_gvrp_request_join(dev); 472 else 473 vlan_gvrp_request_leave(dev); 474 } 475 return 0; 476 } 477 478 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result) 479 { 480 strncpy(result, vlan_dev_info(dev)->real_dev->name, 23); 481 } 482 483 static int vlan_dev_open(struct net_device *dev) 484 { 485 struct vlan_dev_info *vlan = vlan_dev_info(dev); 486 struct net_device *real_dev = vlan->real_dev; 487 int err; 488 489 if (!(real_dev->flags & IFF_UP) && 490 !(vlan->flags & VLAN_FLAG_LOOSE_BINDING)) 491 return -ENETDOWN; 492 493 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) { 494 err = dev_uc_add(real_dev, dev->dev_addr); 495 if (err < 0) 496 goto out; 497 } 498 499 if (dev->flags & IFF_ALLMULTI) { 500 err = dev_set_allmulti(real_dev, 1); 501 if (err < 0) 502 goto del_unicast; 503 } 504 if (dev->flags & IFF_PROMISC) { 505 err = dev_set_promiscuity(real_dev, 1); 506 if (err < 0) 507 goto clear_allmulti; 508 } 509 510 memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN); 511 512 if (vlan->flags & VLAN_FLAG_GVRP) 513 vlan_gvrp_request_join(dev); 514 515 if (netif_carrier_ok(real_dev)) 516 netif_carrier_on(dev); 517 return 0; 518 519 clear_allmulti: 520 if (dev->flags & IFF_ALLMULTI) 521 dev_set_allmulti(real_dev, -1); 522 del_unicast: 523 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) 524 dev_uc_del(real_dev, dev->dev_addr); 525 out: 526 netif_carrier_off(dev); 527 return err; 528 } 529 530 static int vlan_dev_stop(struct net_device *dev) 531 { 532 struct vlan_dev_info *vlan = vlan_dev_info(dev); 533 struct net_device *real_dev = vlan->real_dev; 534 535 if (vlan->flags & VLAN_FLAG_GVRP) 536 vlan_gvrp_request_leave(dev); 537 538 dev_mc_unsync(real_dev, dev); 539 dev_uc_unsync(real_dev, dev); 540 if (dev->flags & IFF_ALLMULTI) 541 dev_set_allmulti(real_dev, -1); 542 if (dev->flags & IFF_PROMISC) 543 dev_set_promiscuity(real_dev, -1); 544 545 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) 546 dev_uc_del(real_dev, dev->dev_addr); 547 548 netif_carrier_off(dev); 549 return 0; 550 } 551 552 static int vlan_dev_set_mac_address(struct net_device *dev, void *p) 553 { 554 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 555 struct sockaddr *addr = p; 556 int err; 557 558 if (!is_valid_ether_addr(addr->sa_data)) 559 return -EADDRNOTAVAIL; 560 561 if (!(dev->flags & IFF_UP)) 562 goto out; 563 564 if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) { 565 err = dev_uc_add(real_dev, addr->sa_data); 566 if (err < 0) 567 return err; 568 } 569 570 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) 571 dev_uc_del(real_dev, dev->dev_addr); 572 573 out: 574 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); 575 return 0; 576 } 577 578 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 579 { 580 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 581 const struct net_device_ops *ops = real_dev->netdev_ops; 582 struct ifreq ifrr; 583 int err = -EOPNOTSUPP; 584 585 strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ); 586 ifrr.ifr_ifru = ifr->ifr_ifru; 587 588 switch (cmd) { 589 case SIOCGMIIPHY: 590 case SIOCGMIIREG: 591 case SIOCSMIIREG: 592 if (netif_device_present(real_dev) && ops->ndo_do_ioctl) 593 err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd); 594 break; 595 } 596 597 if (!err) 598 ifr->ifr_ifru = ifrr.ifr_ifru; 599 600 return err; 601 } 602 603 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa) 604 { 605 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 606 const struct net_device_ops *ops = real_dev->netdev_ops; 607 int err = 0; 608 609 if (netif_device_present(real_dev) && ops->ndo_neigh_setup) 610 err = ops->ndo_neigh_setup(real_dev, pa); 611 612 return err; 613 } 614 615 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 616 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid, 617 struct scatterlist *sgl, unsigned int sgc) 618 { 619 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 620 const struct net_device_ops *ops = real_dev->netdev_ops; 621 int rc = 0; 622 623 if (ops->ndo_fcoe_ddp_setup) 624 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc); 625 626 return rc; 627 } 628 629 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid) 630 { 631 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 632 const struct net_device_ops *ops = real_dev->netdev_ops; 633 int len = 0; 634 635 if (ops->ndo_fcoe_ddp_done) 636 len = ops->ndo_fcoe_ddp_done(real_dev, xid); 637 638 return len; 639 } 640 641 static int vlan_dev_fcoe_enable(struct net_device *dev) 642 { 643 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 644 const struct net_device_ops *ops = real_dev->netdev_ops; 645 int rc = -EINVAL; 646 647 if (ops->ndo_fcoe_enable) 648 rc = ops->ndo_fcoe_enable(real_dev); 649 return rc; 650 } 651 652 static int vlan_dev_fcoe_disable(struct net_device *dev) 653 { 654 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 655 const struct net_device_ops *ops = real_dev->netdev_ops; 656 int rc = -EINVAL; 657 658 if (ops->ndo_fcoe_disable) 659 rc = ops->ndo_fcoe_disable(real_dev); 660 return rc; 661 } 662 663 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type) 664 { 665 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 666 const struct net_device_ops *ops = real_dev->netdev_ops; 667 int rc = -EINVAL; 668 669 if (ops->ndo_fcoe_get_wwn) 670 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type); 671 return rc; 672 } 673 #endif 674 675 static void vlan_dev_change_rx_flags(struct net_device *dev, int change) 676 { 677 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 678 679 if (change & IFF_ALLMULTI) 680 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 681 if (change & IFF_PROMISC) 682 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1); 683 } 684 685 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev) 686 { 687 dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev); 688 dev_uc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev); 689 } 690 691 /* 692 * vlan network devices have devices nesting below it, and are a special 693 * "super class" of normal network devices; split their locks off into a 694 * separate class since they always nest. 695 */ 696 static struct lock_class_key vlan_netdev_xmit_lock_key; 697 static struct lock_class_key vlan_netdev_addr_lock_key; 698 699 static void vlan_dev_set_lockdep_one(struct net_device *dev, 700 struct netdev_queue *txq, 701 void *_subclass) 702 { 703 lockdep_set_class_and_subclass(&txq->_xmit_lock, 704 &vlan_netdev_xmit_lock_key, 705 *(int *)_subclass); 706 } 707 708 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass) 709 { 710 lockdep_set_class_and_subclass(&dev->addr_list_lock, 711 &vlan_netdev_addr_lock_key, 712 subclass); 713 netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass); 714 } 715 716 static const struct header_ops vlan_header_ops = { 717 .create = vlan_dev_hard_header, 718 .rebuild = vlan_dev_rebuild_header, 719 .parse = eth_header_parse, 720 }; 721 722 static const struct net_device_ops vlan_netdev_ops, vlan_netdev_accel_ops, 723 vlan_netdev_ops_sq, vlan_netdev_accel_ops_sq; 724 725 static int vlan_dev_init(struct net_device *dev) 726 { 727 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 728 int subclass = 0; 729 730 netif_carrier_off(dev); 731 732 /* IFF_BROADCAST|IFF_MULTICAST; ??? */ 733 dev->flags = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | 734 IFF_MASTER | IFF_SLAVE); 735 dev->iflink = real_dev->ifindex; 736 dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) | 737 (1<<__LINK_STATE_DORMANT))) | 738 (1<<__LINK_STATE_PRESENT); 739 740 dev->features |= real_dev->features & real_dev->vlan_features; 741 dev->gso_max_size = real_dev->gso_max_size; 742 743 /* ipv6 shared card related stuff */ 744 dev->dev_id = real_dev->dev_id; 745 746 if (is_zero_ether_addr(dev->dev_addr)) 747 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len); 748 if (is_zero_ether_addr(dev->broadcast)) 749 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 750 751 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 752 dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid; 753 #endif 754 755 if (real_dev->features & NETIF_F_HW_VLAN_TX) { 756 dev->header_ops = real_dev->header_ops; 757 dev->hard_header_len = real_dev->hard_header_len; 758 if (real_dev->netdev_ops->ndo_select_queue) 759 dev->netdev_ops = &vlan_netdev_accel_ops_sq; 760 else 761 dev->netdev_ops = &vlan_netdev_accel_ops; 762 } else { 763 dev->header_ops = &vlan_header_ops; 764 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN; 765 if (real_dev->netdev_ops->ndo_select_queue) 766 dev->netdev_ops = &vlan_netdev_ops_sq; 767 else 768 dev->netdev_ops = &vlan_netdev_ops; 769 } 770 771 if (is_vlan_dev(real_dev)) 772 subclass = 1; 773 774 vlan_dev_set_lockdep_class(dev, subclass); 775 776 vlan_dev_info(dev)->vlan_rx_stats = alloc_percpu(struct vlan_rx_stats); 777 if (!vlan_dev_info(dev)->vlan_rx_stats) 778 return -ENOMEM; 779 780 return 0; 781 } 782 783 static void vlan_dev_uninit(struct net_device *dev) 784 { 785 struct vlan_priority_tci_mapping *pm; 786 struct vlan_dev_info *vlan = vlan_dev_info(dev); 787 int i; 788 789 free_percpu(vlan->vlan_rx_stats); 790 vlan->vlan_rx_stats = NULL; 791 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { 792 while ((pm = vlan->egress_priority_map[i]) != NULL) { 793 vlan->egress_priority_map[i] = pm->next; 794 kfree(pm); 795 } 796 } 797 } 798 799 static int vlan_ethtool_get_settings(struct net_device *dev, 800 struct ethtool_cmd *cmd) 801 { 802 const struct vlan_dev_info *vlan = vlan_dev_info(dev); 803 return dev_ethtool_get_settings(vlan->real_dev, cmd); 804 } 805 806 static void vlan_ethtool_get_drvinfo(struct net_device *dev, 807 struct ethtool_drvinfo *info) 808 { 809 strcpy(info->driver, vlan_fullname); 810 strcpy(info->version, vlan_version); 811 strcpy(info->fw_version, "N/A"); 812 } 813 814 static u32 vlan_ethtool_get_rx_csum(struct net_device *dev) 815 { 816 const struct vlan_dev_info *vlan = vlan_dev_info(dev); 817 return dev_ethtool_get_rx_csum(vlan->real_dev); 818 } 819 820 static u32 vlan_ethtool_get_flags(struct net_device *dev) 821 { 822 const struct vlan_dev_info *vlan = vlan_dev_info(dev); 823 return dev_ethtool_get_flags(vlan->real_dev); 824 } 825 826 static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) 827 { 828 dev_txq_stats_fold(dev, stats); 829 830 if (vlan_dev_info(dev)->vlan_rx_stats) { 831 struct vlan_rx_stats *p, accum = {0}; 832 int i; 833 834 for_each_possible_cpu(i) { 835 u64 rxpackets, rxbytes, rxmulticast; 836 unsigned int start; 837 838 p = per_cpu_ptr(vlan_dev_info(dev)->vlan_rx_stats, i); 839 do { 840 start = u64_stats_fetch_begin_bh(&p->syncp); 841 rxpackets = p->rx_packets; 842 rxbytes = p->rx_bytes; 843 rxmulticast = p->rx_multicast; 844 } while (u64_stats_fetch_retry_bh(&p->syncp, start)); 845 accum.rx_packets += rxpackets; 846 accum.rx_bytes += rxbytes; 847 accum.rx_multicast += rxmulticast; 848 /* rx_errors is ulong, not protected by syncp */ 849 accum.rx_errors += p->rx_errors; 850 } 851 stats->rx_packets = accum.rx_packets; 852 stats->rx_bytes = accum.rx_bytes; 853 stats->rx_errors = accum.rx_errors; 854 stats->multicast = accum.rx_multicast; 855 } 856 return stats; 857 } 858 859 static int vlan_ethtool_set_tso(struct net_device *dev, u32 data) 860 { 861 if (data) { 862 struct net_device *real_dev = vlan_dev_info(dev)->real_dev; 863 864 /* Underlying device must support TSO for VLAN-tagged packets 865 * and must have TSO enabled now. 866 */ 867 if (!(real_dev->vlan_features & NETIF_F_TSO)) 868 return -EOPNOTSUPP; 869 if (!(real_dev->features & NETIF_F_TSO)) 870 return -EINVAL; 871 dev->features |= NETIF_F_TSO; 872 } else { 873 dev->features &= ~NETIF_F_TSO; 874 } 875 return 0; 876 } 877 878 static const struct ethtool_ops vlan_ethtool_ops = { 879 .get_settings = vlan_ethtool_get_settings, 880 .get_drvinfo = vlan_ethtool_get_drvinfo, 881 .get_link = ethtool_op_get_link, 882 .get_rx_csum = vlan_ethtool_get_rx_csum, 883 .get_flags = vlan_ethtool_get_flags, 884 .set_tso = vlan_ethtool_set_tso, 885 }; 886 887 static const struct net_device_ops vlan_netdev_ops = { 888 .ndo_change_mtu = vlan_dev_change_mtu, 889 .ndo_init = vlan_dev_init, 890 .ndo_uninit = vlan_dev_uninit, 891 .ndo_open = vlan_dev_open, 892 .ndo_stop = vlan_dev_stop, 893 .ndo_start_xmit = vlan_dev_hard_start_xmit, 894 .ndo_validate_addr = eth_validate_addr, 895 .ndo_set_mac_address = vlan_dev_set_mac_address, 896 .ndo_set_rx_mode = vlan_dev_set_rx_mode, 897 .ndo_set_multicast_list = vlan_dev_set_rx_mode, 898 .ndo_change_rx_flags = vlan_dev_change_rx_flags, 899 .ndo_do_ioctl = vlan_dev_ioctl, 900 .ndo_neigh_setup = vlan_dev_neigh_setup, 901 .ndo_get_stats64 = vlan_dev_get_stats64, 902 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 903 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup, 904 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done, 905 .ndo_fcoe_enable = vlan_dev_fcoe_enable, 906 .ndo_fcoe_disable = vlan_dev_fcoe_disable, 907 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn, 908 #endif 909 }; 910 911 static const struct net_device_ops vlan_netdev_accel_ops = { 912 .ndo_change_mtu = vlan_dev_change_mtu, 913 .ndo_init = vlan_dev_init, 914 .ndo_uninit = vlan_dev_uninit, 915 .ndo_open = vlan_dev_open, 916 .ndo_stop = vlan_dev_stop, 917 .ndo_start_xmit = vlan_dev_hwaccel_hard_start_xmit, 918 .ndo_validate_addr = eth_validate_addr, 919 .ndo_set_mac_address = vlan_dev_set_mac_address, 920 .ndo_set_rx_mode = vlan_dev_set_rx_mode, 921 .ndo_set_multicast_list = vlan_dev_set_rx_mode, 922 .ndo_change_rx_flags = vlan_dev_change_rx_flags, 923 .ndo_do_ioctl = vlan_dev_ioctl, 924 .ndo_neigh_setup = vlan_dev_neigh_setup, 925 .ndo_get_stats64 = vlan_dev_get_stats64, 926 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 927 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup, 928 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done, 929 .ndo_fcoe_enable = vlan_dev_fcoe_enable, 930 .ndo_fcoe_disable = vlan_dev_fcoe_disable, 931 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn, 932 #endif 933 }; 934 935 static const struct net_device_ops vlan_netdev_ops_sq = { 936 .ndo_select_queue = vlan_dev_select_queue, 937 .ndo_change_mtu = vlan_dev_change_mtu, 938 .ndo_init = vlan_dev_init, 939 .ndo_uninit = vlan_dev_uninit, 940 .ndo_open = vlan_dev_open, 941 .ndo_stop = vlan_dev_stop, 942 .ndo_start_xmit = vlan_dev_hard_start_xmit, 943 .ndo_validate_addr = eth_validate_addr, 944 .ndo_set_mac_address = vlan_dev_set_mac_address, 945 .ndo_set_rx_mode = vlan_dev_set_rx_mode, 946 .ndo_set_multicast_list = vlan_dev_set_rx_mode, 947 .ndo_change_rx_flags = vlan_dev_change_rx_flags, 948 .ndo_do_ioctl = vlan_dev_ioctl, 949 .ndo_neigh_setup = vlan_dev_neigh_setup, 950 .ndo_get_stats64 = vlan_dev_get_stats64, 951 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 952 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup, 953 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done, 954 .ndo_fcoe_enable = vlan_dev_fcoe_enable, 955 .ndo_fcoe_disable = vlan_dev_fcoe_disable, 956 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn, 957 #endif 958 }; 959 960 static const struct net_device_ops vlan_netdev_accel_ops_sq = { 961 .ndo_select_queue = vlan_dev_select_queue, 962 .ndo_change_mtu = vlan_dev_change_mtu, 963 .ndo_init = vlan_dev_init, 964 .ndo_uninit = vlan_dev_uninit, 965 .ndo_open = vlan_dev_open, 966 .ndo_stop = vlan_dev_stop, 967 .ndo_start_xmit = vlan_dev_hwaccel_hard_start_xmit, 968 .ndo_validate_addr = eth_validate_addr, 969 .ndo_set_mac_address = vlan_dev_set_mac_address, 970 .ndo_set_rx_mode = vlan_dev_set_rx_mode, 971 .ndo_set_multicast_list = vlan_dev_set_rx_mode, 972 .ndo_change_rx_flags = vlan_dev_change_rx_flags, 973 .ndo_do_ioctl = vlan_dev_ioctl, 974 .ndo_neigh_setup = vlan_dev_neigh_setup, 975 .ndo_get_stats64 = vlan_dev_get_stats64, 976 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 977 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup, 978 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done, 979 .ndo_fcoe_enable = vlan_dev_fcoe_enable, 980 .ndo_fcoe_disable = vlan_dev_fcoe_disable, 981 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn, 982 #endif 983 }; 984 985 void vlan_setup(struct net_device *dev) 986 { 987 ether_setup(dev); 988 989 dev->priv_flags |= IFF_802_1Q_VLAN; 990 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 991 dev->tx_queue_len = 0; 992 993 dev->netdev_ops = &vlan_netdev_ops; 994 dev->destructor = free_netdev; 995 dev->ethtool_ops = &vlan_ethtool_ops; 996 997 memset(dev->broadcast, 0, ETH_ALEN); 998 } 999