1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* -*- linux-c -*- 3 * INET 802.1Q VLAN 4 * Ethernet-type device handling. 5 * 6 * Authors: Ben Greear <greearb@candelatech.com> 7 * Please send support related email to: netdev@vger.kernel.org 8 * VLAN Home Page: http://www.candelatech.com/~greear/vlan.html 9 * 10 * Fixes: Mar 22 2001: Martin Bokaemper <mbokaemper@unispherenetworks.com> 11 * - reset skb->pkt_type on incoming packets when MAC was changed 12 * - see that changed MAC is saddr for outgoing packets 13 * Oct 20, 2001: Ard van Breeman: 14 * - Fix MC-list, finally. 15 * - Flush MC-list on VLAN destroy. 16 */ 17 18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 19 20 #include <linux/module.h> 21 #include <linux/slab.h> 22 #include <linux/skbuff.h> 23 #include <linux/netdevice.h> 24 #include <linux/net_tstamp.h> 25 #include <linux/etherdevice.h> 26 #include <linux/ethtool.h> 27 #include <linux/phy.h> 28 #include <net/arp.h> 29 #include <net/macsec.h> 30 31 #include "vlan.h" 32 #include "vlanproc.h" 33 #include <linux/if_vlan.h> 34 #include <linux/netpoll.h> 35 36 /* 37 * Create the VLAN header for an arbitrary protocol layer 38 * 39 * saddr=NULL means use device source address 40 * daddr=NULL means leave destination address (eg unresolved arp) 41 * 42 * This is called when the SKB is moving down the stack towards the 43 * physical devices. 44 */ 45 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev, 46 unsigned short type, 47 const void *daddr, const void *saddr, 48 unsigned int len) 49 { 50 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 51 struct vlan_hdr *vhdr; 52 unsigned int vhdrlen = 0; 53 u16 vlan_tci = 0; 54 int rc; 55 56 if (!(vlan->flags & VLAN_FLAG_REORDER_HDR)) { 57 vhdr = skb_push(skb, VLAN_HLEN); 58 59 vlan_tci = vlan->vlan_id; 60 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority); 61 vhdr->h_vlan_TCI = htons(vlan_tci); 62 63 /* 64 * Set the protocol type. For a packet of type ETH_P_802_3/2 we 65 * put the length in here instead. 66 */ 67 if (type != ETH_P_802_3 && type != ETH_P_802_2) 68 vhdr->h_vlan_encapsulated_proto = htons(type); 69 else 70 vhdr->h_vlan_encapsulated_proto = htons(len); 71 72 skb->protocol = vlan->vlan_proto; 73 type = ntohs(vlan->vlan_proto); 74 vhdrlen = VLAN_HLEN; 75 } 76 77 /* Before delegating work to the lower layer, enter our MAC-address */ 78 if (saddr == NULL) 79 saddr = dev->dev_addr; 80 81 /* Now make the underlying real hard header */ 82 dev = vlan->real_dev; 83 rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen); 84 if (rc > 0) 85 rc += vhdrlen; 86 return rc; 87 } 88 89 static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb) 90 { 91 #ifdef CONFIG_NET_POLL_CONTROLLER 92 return netpoll_send_skb(vlan->netpoll, skb); 93 #else 94 BUG(); 95 return NETDEV_TX_OK; 96 #endif 97 } 98 99 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb, 100 struct net_device *dev) 101 { 102 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 103 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data); 104 unsigned int len; 105 int ret; 106 107 /* Handle non-VLAN frames if they are sent to us, for example by DHCP. 108 * 109 * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING 110 * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs... 111 */ 112 if (vlan->flags & VLAN_FLAG_REORDER_HDR || 113 veth->h_vlan_proto != vlan->vlan_proto) { 114 u16 vlan_tci; 115 vlan_tci = vlan->vlan_id; 116 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority); 117 __vlan_hwaccel_put_tag(skb, vlan->vlan_proto, vlan_tci); 118 } 119 120 skb->dev = vlan->real_dev; 121 len = skb->len; 122 if (unlikely(netpoll_tx_running(dev))) 123 return vlan_netpoll_send_skb(vlan, skb); 124 125 ret = dev_queue_xmit(skb); 126 127 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 128 struct vlan_pcpu_stats *stats; 129 130 stats = this_cpu_ptr(vlan->vlan_pcpu_stats); 131 u64_stats_update_begin(&stats->syncp); 132 u64_stats_inc(&stats->tx_packets); 133 u64_stats_add(&stats->tx_bytes, len); 134 u64_stats_update_end(&stats->syncp); 135 } else { 136 this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped); 137 } 138 139 return ret; 140 } 141 142 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu) 143 { 144 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 145 unsigned int max_mtu = real_dev->mtu; 146 147 if (netif_reduces_vlan_mtu(real_dev)) 148 max_mtu -= VLAN_HLEN; 149 if (max_mtu < new_mtu) 150 return -ERANGE; 151 152 dev->mtu = new_mtu; 153 154 return 0; 155 } 156 157 void vlan_dev_set_ingress_priority(const struct net_device *dev, 158 u32 skb_prio, u16 vlan_prio) 159 { 160 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 161 162 if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio) 163 vlan->nr_ingress_mappings--; 164 else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio) 165 vlan->nr_ingress_mappings++; 166 167 vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio; 168 } 169 170 int vlan_dev_set_egress_priority(const struct net_device *dev, 171 u32 skb_prio, u16 vlan_prio) 172 { 173 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 174 struct vlan_priority_tci_mapping *mp = NULL; 175 struct vlan_priority_tci_mapping *np; 176 u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK; 177 178 /* See if a priority mapping exists.. */ 179 mp = vlan->egress_priority_map[skb_prio & 0xF]; 180 while (mp) { 181 if (mp->priority == skb_prio) { 182 if (mp->vlan_qos && !vlan_qos) 183 vlan->nr_egress_mappings--; 184 else if (!mp->vlan_qos && vlan_qos) 185 vlan->nr_egress_mappings++; 186 mp->vlan_qos = vlan_qos; 187 return 0; 188 } 189 mp = mp->next; 190 } 191 192 /* Create a new mapping then. */ 193 mp = vlan->egress_priority_map[skb_prio & 0xF]; 194 np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL); 195 if (!np) 196 return -ENOBUFS; 197 198 np->next = mp; 199 np->priority = skb_prio; 200 np->vlan_qos = vlan_qos; 201 /* Before inserting this element in hash table, make sure all its fields 202 * are committed to memory. 203 * coupled with smp_rmb() in vlan_dev_get_egress_qos_mask() 204 */ 205 smp_wmb(); 206 vlan->egress_priority_map[skb_prio & 0xF] = np; 207 if (vlan_qos) 208 vlan->nr_egress_mappings++; 209 return 0; 210 } 211 212 /* Flags are defined in the vlan_flags enum in 213 * include/uapi/linux/if_vlan.h file. 214 */ 215 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask) 216 { 217 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 218 u32 old_flags = vlan->flags; 219 220 if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP | 221 VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP | 222 VLAN_FLAG_BRIDGE_BINDING)) 223 return -EINVAL; 224 225 vlan->flags = (old_flags & ~mask) | (flags & mask); 226 227 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) { 228 if (vlan->flags & VLAN_FLAG_GVRP) 229 vlan_gvrp_request_join(dev); 230 else 231 vlan_gvrp_request_leave(dev); 232 } 233 234 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) { 235 if (vlan->flags & VLAN_FLAG_MVRP) 236 vlan_mvrp_request_join(dev); 237 else 238 vlan_mvrp_request_leave(dev); 239 } 240 return 0; 241 } 242 243 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result, size_t size) 244 { 245 strscpy_pad(result, vlan_dev_priv(dev)->real_dev->name, size); 246 } 247 248 bool vlan_dev_inherit_address(struct net_device *dev, 249 struct net_device *real_dev) 250 { 251 if (dev->addr_assign_type != NET_ADDR_STOLEN) 252 return false; 253 254 eth_hw_addr_set(dev, real_dev->dev_addr); 255 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 256 return true; 257 } 258 259 static int vlan_dev_open(struct net_device *dev) 260 { 261 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 262 struct net_device *real_dev = vlan->real_dev; 263 int err; 264 265 if (!(real_dev->flags & IFF_UP) && 266 !(vlan->flags & VLAN_FLAG_LOOSE_BINDING)) 267 return -ENETDOWN; 268 269 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr) && 270 !vlan_dev_inherit_address(dev, real_dev)) { 271 err = dev_uc_add(real_dev, dev->dev_addr); 272 if (err < 0) 273 goto out; 274 } 275 276 if (dev->flags & IFF_ALLMULTI) { 277 err = dev_set_allmulti(real_dev, 1); 278 if (err < 0) 279 goto del_unicast; 280 } 281 if (dev->flags & IFF_PROMISC) { 282 err = dev_set_promiscuity(real_dev, 1); 283 if (err < 0) 284 goto clear_allmulti; 285 } 286 287 ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr); 288 289 if (vlan->flags & VLAN_FLAG_GVRP) 290 vlan_gvrp_request_join(dev); 291 292 if (vlan->flags & VLAN_FLAG_MVRP) 293 vlan_mvrp_request_join(dev); 294 295 if (netif_carrier_ok(real_dev) && 296 !(vlan->flags & VLAN_FLAG_BRIDGE_BINDING)) 297 netif_carrier_on(dev); 298 return 0; 299 300 clear_allmulti: 301 if (dev->flags & IFF_ALLMULTI) 302 dev_set_allmulti(real_dev, -1); 303 del_unicast: 304 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) 305 dev_uc_del(real_dev, dev->dev_addr); 306 out: 307 netif_carrier_off(dev); 308 return err; 309 } 310 311 static int vlan_dev_stop(struct net_device *dev) 312 { 313 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 314 struct net_device *real_dev = vlan->real_dev; 315 316 dev_mc_unsync(real_dev, dev); 317 dev_uc_unsync(real_dev, dev); 318 if (dev->flags & IFF_ALLMULTI) 319 dev_set_allmulti(real_dev, -1); 320 if (dev->flags & IFF_PROMISC) 321 dev_set_promiscuity(real_dev, -1); 322 323 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) 324 dev_uc_del(real_dev, dev->dev_addr); 325 326 if (!(vlan->flags & VLAN_FLAG_BRIDGE_BINDING)) 327 netif_carrier_off(dev); 328 return 0; 329 } 330 331 static int vlan_dev_set_mac_address(struct net_device *dev, void *p) 332 { 333 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 334 struct sockaddr *addr = p; 335 int err; 336 337 if (!is_valid_ether_addr(addr->sa_data)) 338 return -EADDRNOTAVAIL; 339 340 if (!(dev->flags & IFF_UP)) 341 goto out; 342 343 if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) { 344 err = dev_uc_add(real_dev, addr->sa_data); 345 if (err < 0) 346 return err; 347 } 348 349 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) 350 dev_uc_del(real_dev, dev->dev_addr); 351 352 out: 353 eth_hw_addr_set(dev, addr->sa_data); 354 return 0; 355 } 356 357 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 358 { 359 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 360 const struct net_device_ops *ops = real_dev->netdev_ops; 361 struct ifreq ifrr; 362 int err = -EOPNOTSUPP; 363 364 strscpy_pad(ifrr.ifr_name, real_dev->name, IFNAMSIZ); 365 ifrr.ifr_ifru = ifr->ifr_ifru; 366 367 switch (cmd) { 368 case SIOCSHWTSTAMP: 369 if (!net_eq(dev_net(dev), dev_net(real_dev))) 370 break; 371 fallthrough; 372 case SIOCGMIIPHY: 373 case SIOCGMIIREG: 374 case SIOCSMIIREG: 375 case SIOCGHWTSTAMP: 376 if (netif_device_present(real_dev) && ops->ndo_eth_ioctl) 377 err = ops->ndo_eth_ioctl(real_dev, &ifrr, cmd); 378 break; 379 } 380 381 if (!err) 382 ifr->ifr_ifru = ifrr.ifr_ifru; 383 384 return err; 385 } 386 387 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa) 388 { 389 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 390 const struct net_device_ops *ops = real_dev->netdev_ops; 391 int err = 0; 392 393 if (netif_device_present(real_dev) && ops->ndo_neigh_setup) 394 err = ops->ndo_neigh_setup(real_dev, pa); 395 396 return err; 397 } 398 399 #if IS_ENABLED(CONFIG_FCOE) 400 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid, 401 struct scatterlist *sgl, unsigned int sgc) 402 { 403 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 404 const struct net_device_ops *ops = real_dev->netdev_ops; 405 int rc = 0; 406 407 if (ops->ndo_fcoe_ddp_setup) 408 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc); 409 410 return rc; 411 } 412 413 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid) 414 { 415 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 416 const struct net_device_ops *ops = real_dev->netdev_ops; 417 int len = 0; 418 419 if (ops->ndo_fcoe_ddp_done) 420 len = ops->ndo_fcoe_ddp_done(real_dev, xid); 421 422 return len; 423 } 424 425 static int vlan_dev_fcoe_enable(struct net_device *dev) 426 { 427 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 428 const struct net_device_ops *ops = real_dev->netdev_ops; 429 int rc = -EINVAL; 430 431 if (ops->ndo_fcoe_enable) 432 rc = ops->ndo_fcoe_enable(real_dev); 433 return rc; 434 } 435 436 static int vlan_dev_fcoe_disable(struct net_device *dev) 437 { 438 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 439 const struct net_device_ops *ops = real_dev->netdev_ops; 440 int rc = -EINVAL; 441 442 if (ops->ndo_fcoe_disable) 443 rc = ops->ndo_fcoe_disable(real_dev); 444 return rc; 445 } 446 447 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid, 448 struct scatterlist *sgl, unsigned int sgc) 449 { 450 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 451 const struct net_device_ops *ops = real_dev->netdev_ops; 452 int rc = 0; 453 454 if (ops->ndo_fcoe_ddp_target) 455 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc); 456 457 return rc; 458 } 459 #endif 460 461 #ifdef NETDEV_FCOE_WWNN 462 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type) 463 { 464 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 465 const struct net_device_ops *ops = real_dev->netdev_ops; 466 int rc = -EINVAL; 467 468 if (ops->ndo_fcoe_get_wwn) 469 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type); 470 return rc; 471 } 472 #endif 473 474 static void vlan_dev_change_rx_flags(struct net_device *dev, int change) 475 { 476 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 477 478 if (dev->flags & IFF_UP) { 479 if (change & IFF_ALLMULTI) 480 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 481 if (change & IFF_PROMISC) 482 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1); 483 } 484 } 485 486 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev) 487 { 488 dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev); 489 dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev); 490 } 491 492 /* 493 * vlan network devices have devices nesting below it, and are a special 494 * "super class" of normal network devices; split their locks off into a 495 * separate class since they always nest. 496 */ 497 static struct lock_class_key vlan_netdev_xmit_lock_key; 498 static struct lock_class_key vlan_netdev_addr_lock_key; 499 500 static void vlan_dev_set_lockdep_one(struct net_device *dev, 501 struct netdev_queue *txq, 502 void *unused) 503 { 504 lockdep_set_class(&txq->_xmit_lock, &vlan_netdev_xmit_lock_key); 505 } 506 507 static void vlan_dev_set_lockdep_class(struct net_device *dev) 508 { 509 lockdep_set_class(&dev->addr_list_lock, 510 &vlan_netdev_addr_lock_key); 511 netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, NULL); 512 } 513 514 static __be16 vlan_parse_protocol(const struct sk_buff *skb) 515 { 516 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data); 517 518 return __vlan_get_protocol(skb, veth->h_vlan_proto, NULL); 519 } 520 521 static const struct header_ops vlan_header_ops = { 522 .create = vlan_dev_hard_header, 523 .parse = eth_header_parse, 524 .parse_protocol = vlan_parse_protocol, 525 }; 526 527 static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev, 528 unsigned short type, 529 const void *daddr, const void *saddr, 530 unsigned int len) 531 { 532 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 533 struct net_device *real_dev = vlan->real_dev; 534 535 if (saddr == NULL) 536 saddr = dev->dev_addr; 537 538 return dev_hard_header(skb, real_dev, type, daddr, saddr, len); 539 } 540 541 static const struct header_ops vlan_passthru_header_ops = { 542 .create = vlan_passthru_hard_header, 543 .parse = eth_header_parse, 544 .parse_protocol = vlan_parse_protocol, 545 }; 546 547 static struct device_type vlan_type = { 548 .name = "vlan", 549 }; 550 551 static const struct net_device_ops vlan_netdev_ops; 552 553 static int vlan_dev_init(struct net_device *dev) 554 { 555 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 556 struct net_device *real_dev = vlan->real_dev; 557 558 netif_carrier_off(dev); 559 560 /* IFF_BROADCAST|IFF_MULTICAST; ??? */ 561 dev->flags = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | 562 IFF_MASTER | IFF_SLAVE); 563 dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) | 564 (1<<__LINK_STATE_DORMANT))) | 565 (1<<__LINK_STATE_PRESENT); 566 567 if (vlan->flags & VLAN_FLAG_BRIDGE_BINDING) 568 dev->state |= (1 << __LINK_STATE_NOCARRIER); 569 570 dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG | 571 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE | 572 NETIF_F_GSO_ENCAP_ALL | 573 NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC | 574 NETIF_F_ALL_FCOE; 575 576 if (real_dev->vlan_features & NETIF_F_HW_MACSEC) 577 dev->hw_features |= NETIF_F_HW_MACSEC; 578 579 dev->features |= dev->hw_features | NETIF_F_LLTX; 580 netif_inherit_tso_max(dev, real_dev); 581 if (dev->features & NETIF_F_VLAN_FEATURES) 582 netdev_warn(real_dev, "VLAN features are set incorrectly. Q-in-Q configurations may not work correctly.\n"); 583 584 dev->vlan_features = real_dev->vlan_features & ~NETIF_F_ALL_FCOE; 585 dev->hw_enc_features = vlan_tnl_features(real_dev); 586 dev->mpls_features = real_dev->mpls_features; 587 588 /* ipv6 shared card related stuff */ 589 dev->dev_id = real_dev->dev_id; 590 591 if (is_zero_ether_addr(dev->dev_addr)) { 592 eth_hw_addr_set(dev, real_dev->dev_addr); 593 dev->addr_assign_type = NET_ADDR_STOLEN; 594 } 595 if (is_zero_ether_addr(dev->broadcast)) 596 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 597 598 #if IS_ENABLED(CONFIG_FCOE) 599 dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid; 600 #endif 601 602 dev->needed_headroom = real_dev->needed_headroom; 603 if (vlan_hw_offload_capable(real_dev->features, vlan->vlan_proto)) { 604 dev->header_ops = &vlan_passthru_header_ops; 605 dev->hard_header_len = real_dev->hard_header_len; 606 } else { 607 dev->header_ops = &vlan_header_ops; 608 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN; 609 } 610 611 dev->netdev_ops = &vlan_netdev_ops; 612 613 SET_NETDEV_DEVTYPE(dev, &vlan_type); 614 615 vlan_dev_set_lockdep_class(dev); 616 617 vlan->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats); 618 if (!vlan->vlan_pcpu_stats) 619 return -ENOMEM; 620 621 /* Get vlan's reference to real_dev */ 622 netdev_hold(real_dev, &vlan->dev_tracker, GFP_KERNEL); 623 624 return 0; 625 } 626 627 /* Note: this function might be called multiple times for the same device. */ 628 void vlan_dev_free_egress_priority(const struct net_device *dev) 629 { 630 struct vlan_priority_tci_mapping *pm; 631 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 632 int i; 633 634 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { 635 while ((pm = vlan->egress_priority_map[i]) != NULL) { 636 vlan->egress_priority_map[i] = pm->next; 637 kfree(pm); 638 } 639 } 640 } 641 642 static void vlan_dev_uninit(struct net_device *dev) 643 { 644 vlan_dev_free_egress_priority(dev); 645 } 646 647 static netdev_features_t vlan_dev_fix_features(struct net_device *dev, 648 netdev_features_t features) 649 { 650 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 651 netdev_features_t old_features = features; 652 netdev_features_t lower_features; 653 654 lower_features = netdev_intersect_features((real_dev->vlan_features | 655 NETIF_F_RXCSUM), 656 real_dev->features); 657 658 /* Add HW_CSUM setting to preserve user ability to control 659 * checksum offload on the vlan device. 660 */ 661 if (lower_features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM)) 662 lower_features |= NETIF_F_HW_CSUM; 663 features = netdev_intersect_features(features, lower_features); 664 features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE); 665 features |= NETIF_F_LLTX; 666 667 return features; 668 } 669 670 static int vlan_ethtool_get_link_ksettings(struct net_device *dev, 671 struct ethtool_link_ksettings *cmd) 672 { 673 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 674 675 return __ethtool_get_link_ksettings(vlan->real_dev, cmd); 676 } 677 678 static void vlan_ethtool_get_drvinfo(struct net_device *dev, 679 struct ethtool_drvinfo *info) 680 { 681 strscpy(info->driver, vlan_fullname, sizeof(info->driver)); 682 strscpy(info->version, vlan_version, sizeof(info->version)); 683 strscpy(info->fw_version, "N/A", sizeof(info->fw_version)); 684 } 685 686 static int vlan_ethtool_get_ts_info(struct net_device *dev, 687 struct ethtool_ts_info *info) 688 { 689 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 690 const struct ethtool_ops *ops = vlan->real_dev->ethtool_ops; 691 struct phy_device *phydev = vlan->real_dev->phydev; 692 693 if (phy_has_tsinfo(phydev)) { 694 return phy_ts_info(phydev, info); 695 } else if (ops->get_ts_info) { 696 return ops->get_ts_info(vlan->real_dev, info); 697 } else { 698 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE | 699 SOF_TIMESTAMPING_SOFTWARE; 700 info->phc_index = -1; 701 } 702 703 return 0; 704 } 705 706 static void vlan_dev_get_stats64(struct net_device *dev, 707 struct rtnl_link_stats64 *stats) 708 { 709 struct vlan_pcpu_stats *p; 710 u32 rx_errors = 0, tx_dropped = 0; 711 int i; 712 713 for_each_possible_cpu(i) { 714 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes; 715 unsigned int start; 716 717 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i); 718 do { 719 start = u64_stats_fetch_begin(&p->syncp); 720 rxpackets = u64_stats_read(&p->rx_packets); 721 rxbytes = u64_stats_read(&p->rx_bytes); 722 rxmulticast = u64_stats_read(&p->rx_multicast); 723 txpackets = u64_stats_read(&p->tx_packets); 724 txbytes = u64_stats_read(&p->tx_bytes); 725 } while (u64_stats_fetch_retry(&p->syncp, start)); 726 727 stats->rx_packets += rxpackets; 728 stats->rx_bytes += rxbytes; 729 stats->multicast += rxmulticast; 730 stats->tx_packets += txpackets; 731 stats->tx_bytes += txbytes; 732 /* rx_errors & tx_dropped are u32 */ 733 rx_errors += READ_ONCE(p->rx_errors); 734 tx_dropped += READ_ONCE(p->tx_dropped); 735 } 736 stats->rx_errors = rx_errors; 737 stats->tx_dropped = tx_dropped; 738 } 739 740 #ifdef CONFIG_NET_POLL_CONTROLLER 741 static void vlan_dev_poll_controller(struct net_device *dev) 742 { 743 return; 744 } 745 746 static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo) 747 { 748 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 749 struct net_device *real_dev = vlan->real_dev; 750 struct netpoll *netpoll; 751 int err = 0; 752 753 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL); 754 err = -ENOMEM; 755 if (!netpoll) 756 goto out; 757 758 err = __netpoll_setup(netpoll, real_dev); 759 if (err) { 760 kfree(netpoll); 761 goto out; 762 } 763 764 vlan->netpoll = netpoll; 765 766 out: 767 return err; 768 } 769 770 static void vlan_dev_netpoll_cleanup(struct net_device *dev) 771 { 772 struct vlan_dev_priv *vlan= vlan_dev_priv(dev); 773 struct netpoll *netpoll = vlan->netpoll; 774 775 if (!netpoll) 776 return; 777 778 vlan->netpoll = NULL; 779 __netpoll_free(netpoll); 780 } 781 #endif /* CONFIG_NET_POLL_CONTROLLER */ 782 783 static int vlan_dev_get_iflink(const struct net_device *dev) 784 { 785 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 786 787 return real_dev->ifindex; 788 } 789 790 static int vlan_dev_fill_forward_path(struct net_device_path_ctx *ctx, 791 struct net_device_path *path) 792 { 793 struct vlan_dev_priv *vlan = vlan_dev_priv(ctx->dev); 794 795 path->type = DEV_PATH_VLAN; 796 path->encap.id = vlan->vlan_id; 797 path->encap.proto = vlan->vlan_proto; 798 path->dev = ctx->dev; 799 ctx->dev = vlan->real_dev; 800 if (ctx->num_vlans >= ARRAY_SIZE(ctx->vlan)) 801 return -ENOSPC; 802 803 ctx->vlan[ctx->num_vlans].id = vlan->vlan_id; 804 ctx->vlan[ctx->num_vlans].proto = vlan->vlan_proto; 805 ctx->num_vlans++; 806 807 return 0; 808 } 809 810 #if IS_ENABLED(CONFIG_MACSEC) 811 812 static const struct macsec_ops *vlan_get_macsec_ops(const struct macsec_context *ctx) 813 { 814 return vlan_dev_priv(ctx->netdev)->real_dev->macsec_ops; 815 } 816 817 static int vlan_macsec_offload(int (* const func)(struct macsec_context *), 818 struct macsec_context *ctx) 819 { 820 if (unlikely(!func)) 821 return 0; 822 823 return (*func)(ctx); 824 } 825 826 static int vlan_macsec_dev_open(struct macsec_context *ctx) 827 { 828 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 829 830 if (!ops) 831 return -EOPNOTSUPP; 832 833 return vlan_macsec_offload(ops->mdo_dev_open, ctx); 834 } 835 836 static int vlan_macsec_dev_stop(struct macsec_context *ctx) 837 { 838 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 839 840 if (!ops) 841 return -EOPNOTSUPP; 842 843 return vlan_macsec_offload(ops->mdo_dev_stop, ctx); 844 } 845 846 static int vlan_macsec_add_secy(struct macsec_context *ctx) 847 { 848 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 849 850 if (!ops) 851 return -EOPNOTSUPP; 852 853 return vlan_macsec_offload(ops->mdo_add_secy, ctx); 854 } 855 856 static int vlan_macsec_upd_secy(struct macsec_context *ctx) 857 { 858 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 859 860 if (!ops) 861 return -EOPNOTSUPP; 862 863 return vlan_macsec_offload(ops->mdo_upd_secy, ctx); 864 } 865 866 static int vlan_macsec_del_secy(struct macsec_context *ctx) 867 { 868 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 869 870 if (!ops) 871 return -EOPNOTSUPP; 872 873 return vlan_macsec_offload(ops->mdo_del_secy, ctx); 874 } 875 876 static int vlan_macsec_add_rxsc(struct macsec_context *ctx) 877 { 878 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 879 880 if (!ops) 881 return -EOPNOTSUPP; 882 883 return vlan_macsec_offload(ops->mdo_add_rxsc, ctx); 884 } 885 886 static int vlan_macsec_upd_rxsc(struct macsec_context *ctx) 887 { 888 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 889 890 if (!ops) 891 return -EOPNOTSUPP; 892 893 return vlan_macsec_offload(ops->mdo_upd_rxsc, ctx); 894 } 895 896 static int vlan_macsec_del_rxsc(struct macsec_context *ctx) 897 { 898 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 899 900 if (!ops) 901 return -EOPNOTSUPP; 902 903 return vlan_macsec_offload(ops->mdo_del_rxsc, ctx); 904 } 905 906 static int vlan_macsec_add_rxsa(struct macsec_context *ctx) 907 { 908 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 909 910 if (!ops) 911 return -EOPNOTSUPP; 912 913 return vlan_macsec_offload(ops->mdo_add_rxsa, ctx); 914 } 915 916 static int vlan_macsec_upd_rxsa(struct macsec_context *ctx) 917 { 918 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 919 920 if (!ops) 921 return -EOPNOTSUPP; 922 923 return vlan_macsec_offload(ops->mdo_upd_rxsa, ctx); 924 } 925 926 static int vlan_macsec_del_rxsa(struct macsec_context *ctx) 927 { 928 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 929 930 if (!ops) 931 return -EOPNOTSUPP; 932 933 return vlan_macsec_offload(ops->mdo_del_rxsa, ctx); 934 } 935 936 static int vlan_macsec_add_txsa(struct macsec_context *ctx) 937 { 938 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 939 940 if (!ops) 941 return -EOPNOTSUPP; 942 943 return vlan_macsec_offload(ops->mdo_add_txsa, ctx); 944 } 945 946 static int vlan_macsec_upd_txsa(struct macsec_context *ctx) 947 { 948 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 949 950 if (!ops) 951 return -EOPNOTSUPP; 952 953 return vlan_macsec_offload(ops->mdo_upd_txsa, ctx); 954 } 955 956 static int vlan_macsec_del_txsa(struct macsec_context *ctx) 957 { 958 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 959 960 if (!ops) 961 return -EOPNOTSUPP; 962 963 return vlan_macsec_offload(ops->mdo_del_txsa, ctx); 964 } 965 966 static int vlan_macsec_get_dev_stats(struct macsec_context *ctx) 967 { 968 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 969 970 if (!ops) 971 return -EOPNOTSUPP; 972 973 return vlan_macsec_offload(ops->mdo_get_dev_stats, ctx); 974 } 975 976 static int vlan_macsec_get_tx_sc_stats(struct macsec_context *ctx) 977 { 978 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 979 980 if (!ops) 981 return -EOPNOTSUPP; 982 983 return vlan_macsec_offload(ops->mdo_get_tx_sc_stats, ctx); 984 } 985 986 static int vlan_macsec_get_tx_sa_stats(struct macsec_context *ctx) 987 { 988 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 989 990 if (!ops) 991 return -EOPNOTSUPP; 992 993 return vlan_macsec_offload(ops->mdo_get_tx_sa_stats, ctx); 994 } 995 996 static int vlan_macsec_get_rx_sc_stats(struct macsec_context *ctx) 997 { 998 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 999 1000 if (!ops) 1001 return -EOPNOTSUPP; 1002 1003 return vlan_macsec_offload(ops->mdo_get_rx_sc_stats, ctx); 1004 } 1005 1006 static int vlan_macsec_get_rx_sa_stats(struct macsec_context *ctx) 1007 { 1008 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 1009 1010 if (!ops) 1011 return -EOPNOTSUPP; 1012 1013 return vlan_macsec_offload(ops->mdo_get_rx_sa_stats, ctx); 1014 } 1015 1016 static const struct macsec_ops macsec_offload_ops = { 1017 /* Device wide */ 1018 .mdo_dev_open = vlan_macsec_dev_open, 1019 .mdo_dev_stop = vlan_macsec_dev_stop, 1020 /* SecY */ 1021 .mdo_add_secy = vlan_macsec_add_secy, 1022 .mdo_upd_secy = vlan_macsec_upd_secy, 1023 .mdo_del_secy = vlan_macsec_del_secy, 1024 /* Security channels */ 1025 .mdo_add_rxsc = vlan_macsec_add_rxsc, 1026 .mdo_upd_rxsc = vlan_macsec_upd_rxsc, 1027 .mdo_del_rxsc = vlan_macsec_del_rxsc, 1028 /* Security associations */ 1029 .mdo_add_rxsa = vlan_macsec_add_rxsa, 1030 .mdo_upd_rxsa = vlan_macsec_upd_rxsa, 1031 .mdo_del_rxsa = vlan_macsec_del_rxsa, 1032 .mdo_add_txsa = vlan_macsec_add_txsa, 1033 .mdo_upd_txsa = vlan_macsec_upd_txsa, 1034 .mdo_del_txsa = vlan_macsec_del_txsa, 1035 /* Statistics */ 1036 .mdo_get_dev_stats = vlan_macsec_get_dev_stats, 1037 .mdo_get_tx_sc_stats = vlan_macsec_get_tx_sc_stats, 1038 .mdo_get_tx_sa_stats = vlan_macsec_get_tx_sa_stats, 1039 .mdo_get_rx_sc_stats = vlan_macsec_get_rx_sc_stats, 1040 .mdo_get_rx_sa_stats = vlan_macsec_get_rx_sa_stats, 1041 }; 1042 1043 #endif 1044 1045 static const struct ethtool_ops vlan_ethtool_ops = { 1046 .get_link_ksettings = vlan_ethtool_get_link_ksettings, 1047 .get_drvinfo = vlan_ethtool_get_drvinfo, 1048 .get_link = ethtool_op_get_link, 1049 .get_ts_info = vlan_ethtool_get_ts_info, 1050 }; 1051 1052 static const struct net_device_ops vlan_netdev_ops = { 1053 .ndo_change_mtu = vlan_dev_change_mtu, 1054 .ndo_init = vlan_dev_init, 1055 .ndo_uninit = vlan_dev_uninit, 1056 .ndo_open = vlan_dev_open, 1057 .ndo_stop = vlan_dev_stop, 1058 .ndo_start_xmit = vlan_dev_hard_start_xmit, 1059 .ndo_validate_addr = eth_validate_addr, 1060 .ndo_set_mac_address = vlan_dev_set_mac_address, 1061 .ndo_set_rx_mode = vlan_dev_set_rx_mode, 1062 .ndo_change_rx_flags = vlan_dev_change_rx_flags, 1063 .ndo_eth_ioctl = vlan_dev_ioctl, 1064 .ndo_neigh_setup = vlan_dev_neigh_setup, 1065 .ndo_get_stats64 = vlan_dev_get_stats64, 1066 #if IS_ENABLED(CONFIG_FCOE) 1067 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup, 1068 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done, 1069 .ndo_fcoe_enable = vlan_dev_fcoe_enable, 1070 .ndo_fcoe_disable = vlan_dev_fcoe_disable, 1071 .ndo_fcoe_ddp_target = vlan_dev_fcoe_ddp_target, 1072 #endif 1073 #ifdef NETDEV_FCOE_WWNN 1074 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn, 1075 #endif 1076 #ifdef CONFIG_NET_POLL_CONTROLLER 1077 .ndo_poll_controller = vlan_dev_poll_controller, 1078 .ndo_netpoll_setup = vlan_dev_netpoll_setup, 1079 .ndo_netpoll_cleanup = vlan_dev_netpoll_cleanup, 1080 #endif 1081 .ndo_fix_features = vlan_dev_fix_features, 1082 .ndo_get_iflink = vlan_dev_get_iflink, 1083 .ndo_fill_forward_path = vlan_dev_fill_forward_path, 1084 }; 1085 1086 static void vlan_dev_free(struct net_device *dev) 1087 { 1088 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 1089 1090 free_percpu(vlan->vlan_pcpu_stats); 1091 vlan->vlan_pcpu_stats = NULL; 1092 1093 /* Get rid of the vlan's reference to real_dev */ 1094 netdev_put(vlan->real_dev, &vlan->dev_tracker); 1095 } 1096 1097 void vlan_setup(struct net_device *dev) 1098 { 1099 ether_setup(dev); 1100 1101 dev->priv_flags |= IFF_802_1Q_VLAN | IFF_NO_QUEUE; 1102 dev->priv_flags |= IFF_UNICAST_FLT; 1103 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1104 netif_keep_dst(dev); 1105 1106 dev->netdev_ops = &vlan_netdev_ops; 1107 dev->needs_free_netdev = true; 1108 dev->priv_destructor = vlan_dev_free; 1109 dev->ethtool_ops = &vlan_ethtool_ops; 1110 1111 #if IS_ENABLED(CONFIG_MACSEC) 1112 dev->macsec_ops = &macsec_offload_ops; 1113 #endif 1114 dev->min_mtu = 0; 1115 dev->max_mtu = ETH_MAX_MTU; 1116 1117 eth_zero_addr(dev->broadcast); 1118 } 1119