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 WRITE_ONCE(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_hwtstamp_get(struct net_device *dev, 358 struct kernel_hwtstamp_config *cfg) 359 { 360 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 361 362 return generic_hwtstamp_get_lower(real_dev, cfg); 363 } 364 365 static int vlan_hwtstamp_set(struct net_device *dev, 366 struct kernel_hwtstamp_config *cfg, 367 struct netlink_ext_ack *extack) 368 { 369 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 370 371 if (!net_eq(dev_net(dev), dev_net(real_dev))) 372 return -EOPNOTSUPP; 373 374 return generic_hwtstamp_set_lower(real_dev, cfg, extack); 375 } 376 377 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 378 { 379 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 380 const struct net_device_ops *ops = real_dev->netdev_ops; 381 struct ifreq ifrr; 382 int err = -EOPNOTSUPP; 383 384 strscpy_pad(ifrr.ifr_name, real_dev->name, IFNAMSIZ); 385 ifrr.ifr_ifru = ifr->ifr_ifru; 386 387 switch (cmd) { 388 case SIOCGMIIPHY: 389 case SIOCGMIIREG: 390 case SIOCSMIIREG: 391 if (netif_device_present(real_dev) && ops->ndo_eth_ioctl) 392 err = ops->ndo_eth_ioctl(real_dev, &ifrr, cmd); 393 break; 394 } 395 396 if (!err) 397 ifr->ifr_ifru = ifrr.ifr_ifru; 398 399 return err; 400 } 401 402 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa) 403 { 404 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 405 const struct net_device_ops *ops = real_dev->netdev_ops; 406 int err = 0; 407 408 if (netif_device_present(real_dev) && ops->ndo_neigh_setup) 409 err = ops->ndo_neigh_setup(real_dev, pa); 410 411 return err; 412 } 413 414 #if IS_ENABLED(CONFIG_FCOE) 415 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid, 416 struct scatterlist *sgl, unsigned int sgc) 417 { 418 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 419 const struct net_device_ops *ops = real_dev->netdev_ops; 420 int rc = 0; 421 422 if (ops->ndo_fcoe_ddp_setup) 423 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc); 424 425 return rc; 426 } 427 428 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid) 429 { 430 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 431 const struct net_device_ops *ops = real_dev->netdev_ops; 432 int len = 0; 433 434 if (ops->ndo_fcoe_ddp_done) 435 len = ops->ndo_fcoe_ddp_done(real_dev, xid); 436 437 return len; 438 } 439 440 static int vlan_dev_fcoe_enable(struct net_device *dev) 441 { 442 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 443 const struct net_device_ops *ops = real_dev->netdev_ops; 444 int rc = -EINVAL; 445 446 if (ops->ndo_fcoe_enable) 447 rc = ops->ndo_fcoe_enable(real_dev); 448 return rc; 449 } 450 451 static int vlan_dev_fcoe_disable(struct net_device *dev) 452 { 453 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 454 const struct net_device_ops *ops = real_dev->netdev_ops; 455 int rc = -EINVAL; 456 457 if (ops->ndo_fcoe_disable) 458 rc = ops->ndo_fcoe_disable(real_dev); 459 return rc; 460 } 461 462 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid, 463 struct scatterlist *sgl, unsigned int sgc) 464 { 465 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 466 const struct net_device_ops *ops = real_dev->netdev_ops; 467 int rc = 0; 468 469 if (ops->ndo_fcoe_ddp_target) 470 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc); 471 472 return rc; 473 } 474 #endif 475 476 #ifdef NETDEV_FCOE_WWNN 477 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type) 478 { 479 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 480 const struct net_device_ops *ops = real_dev->netdev_ops; 481 int rc = -EINVAL; 482 483 if (ops->ndo_fcoe_get_wwn) 484 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type); 485 return rc; 486 } 487 #endif 488 489 static void vlan_dev_change_rx_flags(struct net_device *dev, int change) 490 { 491 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 492 493 if (dev->flags & IFF_UP) { 494 if (change & IFF_ALLMULTI) 495 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 496 if (change & IFF_PROMISC) 497 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1); 498 } 499 } 500 501 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev) 502 { 503 dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev); 504 dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev); 505 } 506 507 static __be16 vlan_parse_protocol(const struct sk_buff *skb) 508 { 509 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data); 510 511 return __vlan_get_protocol(skb, veth->h_vlan_proto, NULL); 512 } 513 514 static const struct header_ops vlan_header_ops = { 515 .create = vlan_dev_hard_header, 516 .parse = eth_header_parse, 517 .parse_protocol = vlan_parse_protocol, 518 }; 519 520 static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev, 521 unsigned short type, 522 const void *daddr, const void *saddr, 523 unsigned int len) 524 { 525 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 526 struct net_device *real_dev = vlan->real_dev; 527 528 if (saddr == NULL) 529 saddr = dev->dev_addr; 530 531 return dev_hard_header(skb, real_dev, type, daddr, saddr, len); 532 } 533 534 static const struct header_ops vlan_passthru_header_ops = { 535 .create = vlan_passthru_hard_header, 536 .parse = eth_header_parse, 537 .parse_protocol = vlan_parse_protocol, 538 }; 539 540 static const struct device_type vlan_type = { 541 .name = "vlan", 542 }; 543 544 static const struct net_device_ops vlan_netdev_ops; 545 546 static int vlan_dev_init(struct net_device *dev) 547 { 548 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 549 struct net_device *real_dev = vlan->real_dev; 550 551 netif_carrier_off(dev); 552 553 /* IFF_BROADCAST|IFF_MULTICAST; ??? */ 554 dev->flags = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | 555 IFF_MASTER | IFF_SLAVE); 556 dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) | 557 (1<<__LINK_STATE_DORMANT))) | 558 (1<<__LINK_STATE_PRESENT); 559 560 if (vlan->flags & VLAN_FLAG_BRIDGE_BINDING) 561 dev->state |= (1 << __LINK_STATE_NOCARRIER); 562 563 dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG | 564 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE | 565 NETIF_F_GSO_ENCAP_ALL | 566 NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC | 567 NETIF_F_FCOE_CRC | NETIF_F_FSO; 568 569 if (real_dev->vlan_features & NETIF_F_HW_MACSEC) 570 dev->hw_features |= NETIF_F_HW_MACSEC; 571 572 dev->features |= dev->hw_features; 573 dev->lltx = true; 574 dev->fcoe_mtu = true; 575 netif_inherit_tso_max(dev, real_dev); 576 if (dev->features & NETIF_F_VLAN_FEATURES) 577 netdev_warn(real_dev, "VLAN features are set incorrectly. Q-in-Q configurations may not work correctly.\n"); 578 579 dev->vlan_features = real_dev->vlan_features & 580 ~(NETIF_F_FCOE_CRC | NETIF_F_FSO); 581 dev->hw_enc_features = vlan_tnl_features(real_dev); 582 dev->mpls_features = real_dev->mpls_features; 583 584 /* ipv6 shared card related stuff */ 585 dev->dev_id = real_dev->dev_id; 586 587 if (is_zero_ether_addr(dev->dev_addr)) { 588 eth_hw_addr_set(dev, real_dev->dev_addr); 589 dev->addr_assign_type = NET_ADDR_STOLEN; 590 } 591 if (is_zero_ether_addr(dev->broadcast)) 592 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 593 594 #if IS_ENABLED(CONFIG_FCOE) 595 dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid; 596 #endif 597 598 dev->needed_headroom = real_dev->needed_headroom; 599 if (vlan_hw_offload_capable(real_dev->features, vlan->vlan_proto)) { 600 dev->header_ops = &vlan_passthru_header_ops; 601 dev->hard_header_len = real_dev->hard_header_len; 602 } else { 603 dev->header_ops = &vlan_header_ops; 604 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN; 605 } 606 607 dev->netdev_ops = &vlan_netdev_ops; 608 609 SET_NETDEV_DEVTYPE(dev, &vlan_type); 610 611 netdev_lockdep_set_classes(dev); 612 613 vlan->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats); 614 if (!vlan->vlan_pcpu_stats) 615 return -ENOMEM; 616 617 /* Get vlan's reference to real_dev */ 618 netdev_hold(real_dev, &vlan->dev_tracker, GFP_KERNEL); 619 620 return 0; 621 } 622 623 /* Note: this function might be called multiple times for the same device. */ 624 void vlan_dev_free_egress_priority(const struct net_device *dev) 625 { 626 struct vlan_priority_tci_mapping *pm; 627 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 628 int i; 629 630 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { 631 while ((pm = vlan->egress_priority_map[i]) != NULL) { 632 vlan->egress_priority_map[i] = pm->next; 633 kfree(pm); 634 } 635 } 636 } 637 638 static void vlan_dev_uninit(struct net_device *dev) 639 { 640 vlan_dev_free_egress_priority(dev); 641 } 642 643 static netdev_features_t vlan_dev_fix_features(struct net_device *dev, 644 netdev_features_t features) 645 { 646 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 647 netdev_features_t old_features = features; 648 netdev_features_t lower_features; 649 650 lower_features = netdev_intersect_features((real_dev->vlan_features | 651 NETIF_F_RXCSUM), 652 real_dev->features); 653 654 /* Add HW_CSUM setting to preserve user ability to control 655 * checksum offload on the vlan device. 656 */ 657 if (lower_features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM)) 658 lower_features |= NETIF_F_HW_CSUM; 659 features = netdev_intersect_features(features, lower_features); 660 features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE); 661 662 return features; 663 } 664 665 static int vlan_ethtool_get_link_ksettings(struct net_device *dev, 666 struct ethtool_link_ksettings *cmd) 667 { 668 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 669 670 return __ethtool_get_link_ksettings(vlan->real_dev, cmd); 671 } 672 673 static void vlan_ethtool_get_drvinfo(struct net_device *dev, 674 struct ethtool_drvinfo *info) 675 { 676 strscpy(info->driver, vlan_fullname, sizeof(info->driver)); 677 strscpy(info->version, vlan_version, sizeof(info->version)); 678 strscpy(info->fw_version, "N/A", sizeof(info->fw_version)); 679 } 680 681 static int vlan_ethtool_get_ts_info(struct net_device *dev, 682 struct kernel_ethtool_ts_info *info) 683 { 684 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 685 return ethtool_get_ts_info_by_layer(vlan->real_dev, info); 686 } 687 688 static void vlan_dev_get_stats64(struct net_device *dev, 689 struct rtnl_link_stats64 *stats) 690 { 691 struct vlan_pcpu_stats *p; 692 u32 rx_errors = 0, tx_dropped = 0; 693 int i; 694 695 for_each_possible_cpu(i) { 696 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes; 697 unsigned int start; 698 699 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i); 700 do { 701 start = u64_stats_fetch_begin(&p->syncp); 702 rxpackets = u64_stats_read(&p->rx_packets); 703 rxbytes = u64_stats_read(&p->rx_bytes); 704 rxmulticast = u64_stats_read(&p->rx_multicast); 705 txpackets = u64_stats_read(&p->tx_packets); 706 txbytes = u64_stats_read(&p->tx_bytes); 707 } while (u64_stats_fetch_retry(&p->syncp, start)); 708 709 stats->rx_packets += rxpackets; 710 stats->rx_bytes += rxbytes; 711 stats->multicast += rxmulticast; 712 stats->tx_packets += txpackets; 713 stats->tx_bytes += txbytes; 714 /* rx_errors & tx_dropped are u32 */ 715 rx_errors += READ_ONCE(p->rx_errors); 716 tx_dropped += READ_ONCE(p->tx_dropped); 717 } 718 stats->rx_errors = rx_errors; 719 stats->tx_dropped = tx_dropped; 720 } 721 722 #ifdef CONFIG_NET_POLL_CONTROLLER 723 static void vlan_dev_poll_controller(struct net_device *dev) 724 { 725 return; 726 } 727 728 static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo) 729 { 730 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 731 struct net_device *real_dev = vlan->real_dev; 732 struct netpoll *netpoll; 733 int err = 0; 734 735 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL); 736 err = -ENOMEM; 737 if (!netpoll) 738 goto out; 739 740 err = __netpoll_setup(netpoll, real_dev); 741 if (err) { 742 kfree(netpoll); 743 goto out; 744 } 745 746 vlan->netpoll = netpoll; 747 748 out: 749 return err; 750 } 751 752 static void vlan_dev_netpoll_cleanup(struct net_device *dev) 753 { 754 struct vlan_dev_priv *vlan= vlan_dev_priv(dev); 755 struct netpoll *netpoll = vlan->netpoll; 756 757 if (!netpoll) 758 return; 759 760 vlan->netpoll = NULL; 761 __netpoll_free(netpoll); 762 } 763 #endif /* CONFIG_NET_POLL_CONTROLLER */ 764 765 static int vlan_dev_get_iflink(const struct net_device *dev) 766 { 767 const struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 768 769 return READ_ONCE(real_dev->ifindex); 770 } 771 772 static int vlan_dev_fill_forward_path(struct net_device_path_ctx *ctx, 773 struct net_device_path *path) 774 { 775 struct vlan_dev_priv *vlan = vlan_dev_priv(ctx->dev); 776 777 path->type = DEV_PATH_VLAN; 778 path->encap.id = vlan->vlan_id; 779 path->encap.proto = vlan->vlan_proto; 780 path->dev = ctx->dev; 781 ctx->dev = vlan->real_dev; 782 if (ctx->num_vlans >= ARRAY_SIZE(ctx->vlan)) 783 return -ENOSPC; 784 785 ctx->vlan[ctx->num_vlans].id = vlan->vlan_id; 786 ctx->vlan[ctx->num_vlans].proto = vlan->vlan_proto; 787 ctx->num_vlans++; 788 789 return 0; 790 } 791 792 #if IS_ENABLED(CONFIG_MACSEC) 793 794 static const struct macsec_ops *vlan_get_macsec_ops(const struct macsec_context *ctx) 795 { 796 return vlan_dev_priv(ctx->netdev)->real_dev->macsec_ops; 797 } 798 799 static int vlan_macsec_offload(int (* const func)(struct macsec_context *), 800 struct macsec_context *ctx) 801 { 802 if (unlikely(!func)) 803 return 0; 804 805 return (*func)(ctx); 806 } 807 808 static int vlan_macsec_dev_open(struct macsec_context *ctx) 809 { 810 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 811 812 if (!ops) 813 return -EOPNOTSUPP; 814 815 return vlan_macsec_offload(ops->mdo_dev_open, ctx); 816 } 817 818 static int vlan_macsec_dev_stop(struct macsec_context *ctx) 819 { 820 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 821 822 if (!ops) 823 return -EOPNOTSUPP; 824 825 return vlan_macsec_offload(ops->mdo_dev_stop, ctx); 826 } 827 828 static int vlan_macsec_add_secy(struct macsec_context *ctx) 829 { 830 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 831 832 if (!ops) 833 return -EOPNOTSUPP; 834 835 return vlan_macsec_offload(ops->mdo_add_secy, ctx); 836 } 837 838 static int vlan_macsec_upd_secy(struct macsec_context *ctx) 839 { 840 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 841 842 if (!ops) 843 return -EOPNOTSUPP; 844 845 return vlan_macsec_offload(ops->mdo_upd_secy, ctx); 846 } 847 848 static int vlan_macsec_del_secy(struct macsec_context *ctx) 849 { 850 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 851 852 if (!ops) 853 return -EOPNOTSUPP; 854 855 return vlan_macsec_offload(ops->mdo_del_secy, ctx); 856 } 857 858 static int vlan_macsec_add_rxsc(struct macsec_context *ctx) 859 { 860 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 861 862 if (!ops) 863 return -EOPNOTSUPP; 864 865 return vlan_macsec_offload(ops->mdo_add_rxsc, ctx); 866 } 867 868 static int vlan_macsec_upd_rxsc(struct macsec_context *ctx) 869 { 870 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 871 872 if (!ops) 873 return -EOPNOTSUPP; 874 875 return vlan_macsec_offload(ops->mdo_upd_rxsc, ctx); 876 } 877 878 static int vlan_macsec_del_rxsc(struct macsec_context *ctx) 879 { 880 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 881 882 if (!ops) 883 return -EOPNOTSUPP; 884 885 return vlan_macsec_offload(ops->mdo_del_rxsc, ctx); 886 } 887 888 static int vlan_macsec_add_rxsa(struct macsec_context *ctx) 889 { 890 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 891 892 if (!ops) 893 return -EOPNOTSUPP; 894 895 return vlan_macsec_offload(ops->mdo_add_rxsa, ctx); 896 } 897 898 static int vlan_macsec_upd_rxsa(struct macsec_context *ctx) 899 { 900 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 901 902 if (!ops) 903 return -EOPNOTSUPP; 904 905 return vlan_macsec_offload(ops->mdo_upd_rxsa, ctx); 906 } 907 908 static int vlan_macsec_del_rxsa(struct macsec_context *ctx) 909 { 910 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 911 912 if (!ops) 913 return -EOPNOTSUPP; 914 915 return vlan_macsec_offload(ops->mdo_del_rxsa, ctx); 916 } 917 918 static int vlan_macsec_add_txsa(struct macsec_context *ctx) 919 { 920 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 921 922 if (!ops) 923 return -EOPNOTSUPP; 924 925 return vlan_macsec_offload(ops->mdo_add_txsa, ctx); 926 } 927 928 static int vlan_macsec_upd_txsa(struct macsec_context *ctx) 929 { 930 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 931 932 if (!ops) 933 return -EOPNOTSUPP; 934 935 return vlan_macsec_offload(ops->mdo_upd_txsa, ctx); 936 } 937 938 static int vlan_macsec_del_txsa(struct macsec_context *ctx) 939 { 940 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 941 942 if (!ops) 943 return -EOPNOTSUPP; 944 945 return vlan_macsec_offload(ops->mdo_del_txsa, ctx); 946 } 947 948 static int vlan_macsec_get_dev_stats(struct macsec_context *ctx) 949 { 950 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 951 952 if (!ops) 953 return -EOPNOTSUPP; 954 955 return vlan_macsec_offload(ops->mdo_get_dev_stats, ctx); 956 } 957 958 static int vlan_macsec_get_tx_sc_stats(struct macsec_context *ctx) 959 { 960 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 961 962 if (!ops) 963 return -EOPNOTSUPP; 964 965 return vlan_macsec_offload(ops->mdo_get_tx_sc_stats, ctx); 966 } 967 968 static int vlan_macsec_get_tx_sa_stats(struct macsec_context *ctx) 969 { 970 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 971 972 if (!ops) 973 return -EOPNOTSUPP; 974 975 return vlan_macsec_offload(ops->mdo_get_tx_sa_stats, ctx); 976 } 977 978 static int vlan_macsec_get_rx_sc_stats(struct macsec_context *ctx) 979 { 980 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 981 982 if (!ops) 983 return -EOPNOTSUPP; 984 985 return vlan_macsec_offload(ops->mdo_get_rx_sc_stats, ctx); 986 } 987 988 static int vlan_macsec_get_rx_sa_stats(struct macsec_context *ctx) 989 { 990 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 991 992 if (!ops) 993 return -EOPNOTSUPP; 994 995 return vlan_macsec_offload(ops->mdo_get_rx_sa_stats, ctx); 996 } 997 998 static const struct macsec_ops macsec_offload_ops = { 999 /* Device wide */ 1000 .mdo_dev_open = vlan_macsec_dev_open, 1001 .mdo_dev_stop = vlan_macsec_dev_stop, 1002 /* SecY */ 1003 .mdo_add_secy = vlan_macsec_add_secy, 1004 .mdo_upd_secy = vlan_macsec_upd_secy, 1005 .mdo_del_secy = vlan_macsec_del_secy, 1006 /* Security channels */ 1007 .mdo_add_rxsc = vlan_macsec_add_rxsc, 1008 .mdo_upd_rxsc = vlan_macsec_upd_rxsc, 1009 .mdo_del_rxsc = vlan_macsec_del_rxsc, 1010 /* Security associations */ 1011 .mdo_add_rxsa = vlan_macsec_add_rxsa, 1012 .mdo_upd_rxsa = vlan_macsec_upd_rxsa, 1013 .mdo_del_rxsa = vlan_macsec_del_rxsa, 1014 .mdo_add_txsa = vlan_macsec_add_txsa, 1015 .mdo_upd_txsa = vlan_macsec_upd_txsa, 1016 .mdo_del_txsa = vlan_macsec_del_txsa, 1017 /* Statistics */ 1018 .mdo_get_dev_stats = vlan_macsec_get_dev_stats, 1019 .mdo_get_tx_sc_stats = vlan_macsec_get_tx_sc_stats, 1020 .mdo_get_tx_sa_stats = vlan_macsec_get_tx_sa_stats, 1021 .mdo_get_rx_sc_stats = vlan_macsec_get_rx_sc_stats, 1022 .mdo_get_rx_sa_stats = vlan_macsec_get_rx_sa_stats, 1023 }; 1024 1025 #endif 1026 1027 static const struct ethtool_ops vlan_ethtool_ops = { 1028 .get_link_ksettings = vlan_ethtool_get_link_ksettings, 1029 .get_drvinfo = vlan_ethtool_get_drvinfo, 1030 .get_link = ethtool_op_get_link, 1031 .get_ts_info = vlan_ethtool_get_ts_info, 1032 }; 1033 1034 static const struct net_device_ops vlan_netdev_ops = { 1035 .ndo_change_mtu = vlan_dev_change_mtu, 1036 .ndo_init = vlan_dev_init, 1037 .ndo_uninit = vlan_dev_uninit, 1038 .ndo_open = vlan_dev_open, 1039 .ndo_stop = vlan_dev_stop, 1040 .ndo_start_xmit = vlan_dev_hard_start_xmit, 1041 .ndo_validate_addr = eth_validate_addr, 1042 .ndo_set_mac_address = vlan_dev_set_mac_address, 1043 .ndo_set_rx_mode = vlan_dev_set_rx_mode, 1044 .ndo_change_rx_flags = vlan_dev_change_rx_flags, 1045 .ndo_eth_ioctl = vlan_dev_ioctl, 1046 .ndo_neigh_setup = vlan_dev_neigh_setup, 1047 .ndo_get_stats64 = vlan_dev_get_stats64, 1048 #if IS_ENABLED(CONFIG_FCOE) 1049 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup, 1050 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done, 1051 .ndo_fcoe_enable = vlan_dev_fcoe_enable, 1052 .ndo_fcoe_disable = vlan_dev_fcoe_disable, 1053 .ndo_fcoe_ddp_target = vlan_dev_fcoe_ddp_target, 1054 #endif 1055 #ifdef NETDEV_FCOE_WWNN 1056 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn, 1057 #endif 1058 #ifdef CONFIG_NET_POLL_CONTROLLER 1059 .ndo_poll_controller = vlan_dev_poll_controller, 1060 .ndo_netpoll_setup = vlan_dev_netpoll_setup, 1061 .ndo_netpoll_cleanup = vlan_dev_netpoll_cleanup, 1062 #endif 1063 .ndo_fix_features = vlan_dev_fix_features, 1064 .ndo_get_iflink = vlan_dev_get_iflink, 1065 .ndo_fill_forward_path = vlan_dev_fill_forward_path, 1066 .ndo_hwtstamp_get = vlan_hwtstamp_get, 1067 .ndo_hwtstamp_set = vlan_hwtstamp_set, 1068 }; 1069 1070 static void vlan_dev_free(struct net_device *dev) 1071 { 1072 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 1073 1074 free_percpu(vlan->vlan_pcpu_stats); 1075 vlan->vlan_pcpu_stats = NULL; 1076 1077 /* Get rid of the vlan's reference to real_dev */ 1078 netdev_put(vlan->real_dev, &vlan->dev_tracker); 1079 } 1080 1081 void vlan_setup(struct net_device *dev) 1082 { 1083 ether_setup(dev); 1084 1085 dev->priv_flags |= IFF_802_1Q_VLAN | IFF_NO_QUEUE; 1086 dev->priv_flags |= IFF_UNICAST_FLT; 1087 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1088 netif_keep_dst(dev); 1089 1090 dev->netdev_ops = &vlan_netdev_ops; 1091 dev->needs_free_netdev = true; 1092 dev->priv_destructor = vlan_dev_free; 1093 dev->ethtool_ops = &vlan_ethtool_ops; 1094 1095 #if IS_ENABLED(CONFIG_MACSEC) 1096 dev->macsec_ops = &macsec_offload_ops; 1097 #endif 1098 dev->min_mtu = 0; 1099 dev->max_mtu = ETH_MAX_MTU; 1100 1101 eth_zero_addr(dev->broadcast); 1102 } 1103