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 #include <net/netdev_lock.h> 31 32 #include "vlan.h" 33 #include "vlanproc.h" 34 #include <linux/if_vlan.h> 35 #include <linux/netpoll.h> 36 37 /* 38 * Create the VLAN header for an arbitrary protocol layer 39 * 40 * saddr=NULL means use device source address 41 * daddr=NULL means leave destination address (eg unresolved arp) 42 * 43 * This is called when the SKB is moving down the stack towards the 44 * physical devices. 45 */ 46 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev, 47 unsigned short type, 48 const void *daddr, const void *saddr, 49 unsigned int len) 50 { 51 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 52 struct vlan_hdr *vhdr; 53 unsigned int vhdrlen = 0; 54 u16 vlan_tci = 0; 55 int rc; 56 57 if (!(vlan->flags & VLAN_FLAG_REORDER_HDR)) { 58 unsigned int hlen = READ_ONCE(dev->hard_header_len) + 59 READ_ONCE(dev->needed_headroom); 60 61 if (skb_cow_head(skb, hlen) < 0) 62 return -ENOMEM; 63 vhdr = skb_push(skb, VLAN_HLEN); 64 65 vlan_tci = vlan->vlan_id; 66 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority); 67 vhdr->h_vlan_TCI = htons(vlan_tci); 68 69 /* 70 * Set the protocol type. For a packet of type ETH_P_802_3/2 we 71 * put the length in here instead. 72 */ 73 if (type != ETH_P_802_3 && type != ETH_P_802_2) 74 vhdr->h_vlan_encapsulated_proto = htons(type); 75 else 76 vhdr->h_vlan_encapsulated_proto = htons(len); 77 78 skb->protocol = vlan->vlan_proto; 79 type = ntohs(vlan->vlan_proto); 80 vhdrlen = VLAN_HLEN; 81 } 82 83 /* Before delegating work to the lower layer, enter our MAC-address */ 84 if (saddr == NULL) 85 saddr = dev->dev_addr; 86 87 /* Now make the underlying real hard header */ 88 dev = vlan->real_dev; 89 rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen); 90 if (rc > 0) 91 rc += vhdrlen; 92 return rc; 93 } 94 95 static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb) 96 { 97 #ifdef CONFIG_NET_POLL_CONTROLLER 98 return netpoll_send_skb(vlan->netpoll, skb); 99 #else 100 BUG(); 101 return NETDEV_TX_OK; 102 #endif 103 } 104 105 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb, 106 struct net_device *dev) 107 { 108 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 109 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data); 110 unsigned int len; 111 int ret; 112 113 /* Handle non-VLAN frames if they are sent to us, for example by DHCP. 114 * 115 * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING 116 * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs... 117 */ 118 if (vlan->flags & VLAN_FLAG_REORDER_HDR || 119 veth->h_vlan_proto != vlan->vlan_proto) { 120 u16 vlan_tci; 121 vlan_tci = vlan->vlan_id; 122 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority); 123 __vlan_hwaccel_put_tag(skb, vlan->vlan_proto, vlan_tci); 124 } 125 126 skb->dev = vlan->real_dev; 127 len = skb->len; 128 if (unlikely(netpoll_tx_running(dev))) 129 return vlan_netpoll_send_skb(vlan, skb); 130 131 ret = dev_queue_xmit(skb); 132 133 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { 134 struct vlan_pcpu_stats *stats; 135 136 stats = this_cpu_ptr(vlan->vlan_pcpu_stats); 137 u64_stats_update_begin(&stats->syncp); 138 u64_stats_inc(&stats->tx_packets); 139 u64_stats_add(&stats->tx_bytes, len); 140 u64_stats_update_end(&stats->syncp); 141 } else { 142 this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped); 143 } 144 145 return ret; 146 } 147 148 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu) 149 { 150 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 151 unsigned int max_mtu = real_dev->mtu; 152 153 if (netif_reduces_vlan_mtu(real_dev)) 154 max_mtu -= VLAN_HLEN; 155 if (max_mtu < new_mtu) 156 return -ERANGE; 157 158 WRITE_ONCE(dev->mtu, new_mtu); 159 160 return 0; 161 } 162 163 void vlan_dev_set_ingress_priority(const struct net_device *dev, 164 u32 skb_prio, u16 vlan_prio) 165 { 166 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 167 168 if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio) 169 vlan->nr_ingress_mappings--; 170 else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio) 171 vlan->nr_ingress_mappings++; 172 173 vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio; 174 } 175 176 int vlan_dev_set_egress_priority(const struct net_device *dev, 177 u32 skb_prio, u16 vlan_prio) 178 { 179 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 180 struct vlan_priority_tci_mapping __rcu **mpp; 181 struct vlan_priority_tci_mapping *mp; 182 struct vlan_priority_tci_mapping *np; 183 u32 bucket = skb_prio & 0xF; 184 u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK; 185 186 /* See if a priority mapping exists.. */ 187 mpp = &vlan->egress_priority_map[bucket]; 188 mp = rtnl_dereference(*mpp); 189 while (mp) { 190 if (mp->priority == skb_prio) { 191 if (!vlan_qos) { 192 rcu_assign_pointer(*mpp, rtnl_dereference(mp->next)); 193 vlan->nr_egress_mappings--; 194 kfree_rcu(mp, rcu); 195 } else { 196 WRITE_ONCE(mp->vlan_qos, vlan_qos); 197 } 198 return 0; 199 } 200 mpp = &mp->next; 201 mp = rtnl_dereference(*mpp); 202 } 203 204 /* Create a new mapping then. */ 205 if (!vlan_qos) 206 return 0; 207 208 np = kmalloc_obj(struct vlan_priority_tci_mapping); 209 if (!np) 210 return -ENOBUFS; 211 212 np->priority = skb_prio; 213 np->vlan_qos = vlan_qos; 214 RCU_INIT_POINTER(np->next, rtnl_dereference(vlan->egress_priority_map[bucket])); 215 rcu_assign_pointer(vlan->egress_priority_map[bucket], np); 216 if (vlan_qos) 217 vlan->nr_egress_mappings++; 218 return 0; 219 } 220 221 /* Flags are defined in the vlan_flags enum in 222 * include/uapi/linux/if_vlan.h file. 223 */ 224 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask) 225 { 226 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 227 u32 old_flags = vlan->flags; 228 229 if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP | 230 VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP | 231 VLAN_FLAG_BRIDGE_BINDING)) 232 return -EINVAL; 233 234 vlan->flags = (old_flags & ~mask) | (flags & mask); 235 236 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) { 237 if (vlan->flags & VLAN_FLAG_GVRP) 238 vlan_gvrp_request_join(dev); 239 else 240 vlan_gvrp_request_leave(dev); 241 } 242 243 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) { 244 if (vlan->flags & VLAN_FLAG_MVRP) 245 vlan_mvrp_request_join(dev); 246 else 247 vlan_mvrp_request_leave(dev); 248 } 249 return 0; 250 } 251 252 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result, size_t size) 253 { 254 strscpy_pad(result, vlan_dev_priv(dev)->real_dev->name, size); 255 } 256 257 bool vlan_dev_inherit_address(struct net_device *dev, 258 struct net_device *real_dev) 259 { 260 if (dev->addr_assign_type != NET_ADDR_STOLEN) 261 return false; 262 263 eth_hw_addr_set(dev, real_dev->dev_addr); 264 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 265 return true; 266 } 267 268 static int vlan_dev_open(struct net_device *dev) 269 { 270 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 271 struct net_device *real_dev = vlan->real_dev; 272 int err; 273 274 if (!(real_dev->flags & IFF_UP) && 275 !(vlan->flags & VLAN_FLAG_LOOSE_BINDING)) 276 return -ENETDOWN; 277 278 /* The explicit open supersedes any deferred link-state sync */ 279 netdev_work_cancel(dev, VLAN_WORK_LINK_STATE); 280 281 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr) && 282 !vlan_dev_inherit_address(dev, real_dev)) { 283 err = dev_uc_add(real_dev, dev->dev_addr); 284 if (err < 0) 285 goto out; 286 } 287 288 ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr); 289 290 if (vlan->flags & VLAN_FLAG_GVRP) 291 vlan_gvrp_request_join(dev); 292 293 if (vlan->flags & VLAN_FLAG_MVRP) 294 vlan_mvrp_request_join(dev); 295 296 if (netif_carrier_ok(real_dev) && 297 !(vlan->flags & VLAN_FLAG_BRIDGE_BINDING)) 298 netif_carrier_on(dev); 299 return 0; 300 301 out: 302 netif_carrier_off(dev); 303 return err; 304 } 305 306 static int vlan_dev_stop(struct net_device *dev) 307 { 308 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 309 struct net_device *real_dev = vlan->real_dev; 310 311 /* The explicit close supersedes any deferred link-state sync */ 312 netdev_work_cancel(dev, VLAN_WORK_LINK_STATE); 313 314 dev_mc_unsync(real_dev, dev); 315 dev_uc_unsync(real_dev, dev); 316 317 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) 318 dev_uc_del(real_dev, dev->dev_addr); 319 320 if (!(vlan->flags & VLAN_FLAG_BRIDGE_BINDING)) 321 netif_carrier_off(dev); 322 return 0; 323 } 324 325 static int vlan_dev_set_mac_address(struct net_device *dev, void *p) 326 { 327 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 328 struct sockaddr *addr = p; 329 int err; 330 331 if (!is_valid_ether_addr(addr->sa_data)) 332 return -EADDRNOTAVAIL; 333 334 if (!(dev->flags & IFF_UP)) 335 goto out; 336 337 if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) { 338 err = dev_uc_add(real_dev, addr->sa_data); 339 if (err < 0) 340 return err; 341 } 342 343 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) 344 dev_uc_del(real_dev, dev->dev_addr); 345 346 out: 347 eth_hw_addr_set(dev, addr->sa_data); 348 return 0; 349 } 350 351 static int vlan_hwtstamp_get(struct net_device *dev, 352 struct kernel_hwtstamp_config *cfg) 353 { 354 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 355 356 return generic_hwtstamp_get_lower(real_dev, cfg); 357 } 358 359 static int vlan_hwtstamp_set(struct net_device *dev, 360 struct kernel_hwtstamp_config *cfg, 361 struct netlink_ext_ack *extack) 362 { 363 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 364 365 if (!net_eq(dev_net(dev), dev_net(real_dev))) 366 return -EOPNOTSUPP; 367 368 return generic_hwtstamp_set_lower(real_dev, cfg, extack); 369 } 370 371 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 372 { 373 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 374 struct ifreq ifrr; 375 int err = -EOPNOTSUPP; 376 377 strscpy_pad(ifrr.ifr_name, real_dev->name, IFNAMSIZ); 378 ifrr.ifr_ifru = ifr->ifr_ifru; 379 380 switch (cmd) { 381 case SIOCGMIIPHY: 382 case SIOCGMIIREG: 383 case SIOCSMIIREG: 384 err = dev_eth_ioctl(real_dev, &ifrr, cmd); 385 break; 386 } 387 388 if (!err) 389 ifr->ifr_ifru = ifrr.ifr_ifru; 390 391 return err; 392 } 393 394 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa) 395 { 396 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 397 const struct net_device_ops *ops = real_dev->netdev_ops; 398 int err = 0; 399 400 if (netif_device_present(real_dev) && ops->ndo_neigh_setup) 401 err = ops->ndo_neigh_setup(real_dev, pa); 402 403 return err; 404 } 405 406 #if IS_ENABLED(CONFIG_FCOE) 407 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid, 408 struct scatterlist *sgl, unsigned int sgc) 409 { 410 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 411 const struct net_device_ops *ops = real_dev->netdev_ops; 412 int rc = 0; 413 414 if (ops->ndo_fcoe_ddp_setup) 415 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc); 416 417 return rc; 418 } 419 420 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid) 421 { 422 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 423 const struct net_device_ops *ops = real_dev->netdev_ops; 424 int len = 0; 425 426 if (ops->ndo_fcoe_ddp_done) 427 len = ops->ndo_fcoe_ddp_done(real_dev, xid); 428 429 return len; 430 } 431 432 static int vlan_dev_fcoe_enable(struct net_device *dev) 433 { 434 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 435 const struct net_device_ops *ops = real_dev->netdev_ops; 436 int rc = -EINVAL; 437 438 if (ops->ndo_fcoe_enable) 439 rc = ops->ndo_fcoe_enable(real_dev); 440 return rc; 441 } 442 443 static int vlan_dev_fcoe_disable(struct net_device *dev) 444 { 445 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 446 const struct net_device_ops *ops = real_dev->netdev_ops; 447 int rc = -EINVAL; 448 449 if (ops->ndo_fcoe_disable) 450 rc = ops->ndo_fcoe_disable(real_dev); 451 return rc; 452 } 453 454 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid, 455 struct scatterlist *sgl, unsigned int sgc) 456 { 457 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 458 const struct net_device_ops *ops = real_dev->netdev_ops; 459 int rc = 0; 460 461 if (ops->ndo_fcoe_ddp_target) 462 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc); 463 464 return rc; 465 } 466 #endif 467 468 #ifdef NETDEV_FCOE_WWNN 469 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type) 470 { 471 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 472 const struct net_device_ops *ops = real_dev->netdev_ops; 473 int rc = -EINVAL; 474 475 if (ops->ndo_fcoe_get_wwn) 476 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type); 477 return rc; 478 } 479 #endif 480 481 static void vlan_dev_change_rx_flags(struct net_device *dev, int change) 482 { 483 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 484 485 if (change & IFF_ALLMULTI) 486 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); 487 if (change & IFF_PROMISC) 488 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1); 489 } 490 491 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev) 492 { 493 dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev); 494 dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev); 495 } 496 497 static __be16 vlan_parse_protocol(const struct sk_buff *skb) 498 { 499 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data); 500 501 return __vlan_get_protocol(skb, veth->h_vlan_proto, NULL); 502 } 503 504 static const struct header_ops vlan_header_ops = { 505 .create = vlan_dev_hard_header, 506 .parse = eth_header_parse, 507 .parse_protocol = vlan_parse_protocol, 508 }; 509 510 static const struct device_type vlan_type = { 511 .name = "vlan", 512 }; 513 514 static const struct net_device_ops vlan_netdev_ops; 515 516 static int vlan_dev_init(struct net_device *dev) 517 { 518 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 519 struct net_device *real_dev = vlan->real_dev; 520 521 netif_carrier_off(dev); 522 523 /* IFF_BROADCAST|IFF_MULTICAST; ??? */ 524 dev->flags = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | 525 IFF_MASTER | IFF_SLAVE); 526 dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) | 527 (1<<__LINK_STATE_DORMANT))) | 528 (1<<__LINK_STATE_PRESENT); 529 530 if (vlan->flags & VLAN_FLAG_BRIDGE_BINDING) 531 dev->state |= (1 << __LINK_STATE_NOCARRIER); 532 533 dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG | 534 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE | 535 NETIF_F_GSO_ENCAP_ALL | 536 NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC | 537 NETIF_F_FCOE_CRC | NETIF_F_FSO; 538 539 if (real_dev->vlan_features & NETIF_F_HW_MACSEC) 540 dev->hw_features |= NETIF_F_HW_MACSEC; 541 542 dev->features |= dev->hw_features; 543 dev->lltx = true; 544 dev->fcoe_mtu = true; 545 netif_inherit_tso_max(dev, real_dev); 546 if (dev->features & NETIF_F_VLAN_FEATURES) 547 netdev_warn(real_dev, "VLAN features are set incorrectly. Q-in-Q configurations may not work correctly.\n"); 548 549 dev->vlan_features = real_dev->vlan_features & 550 ~(NETIF_F_FCOE_CRC | NETIF_F_FSO); 551 dev->hw_enc_features = vlan_tnl_features(real_dev); 552 dev->mpls_features = real_dev->mpls_features; 553 554 /* ipv6 shared card related stuff */ 555 dev->dev_id = real_dev->dev_id; 556 557 if (is_zero_ether_addr(dev->dev_addr)) { 558 eth_hw_addr_set(dev, real_dev->dev_addr); 559 dev->addr_assign_type = NET_ADDR_STOLEN; 560 } 561 if (is_zero_ether_addr(dev->broadcast)) 562 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); 563 564 #if IS_ENABLED(CONFIG_FCOE) 565 dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid; 566 #endif 567 568 dev->needed_headroom = real_dev->needed_headroom + VLAN_HLEN; 569 dev->needed_tailroom = real_dev->needed_tailroom; 570 dev->header_ops = &vlan_header_ops; 571 dev->hard_header_len = real_dev->hard_header_len; 572 573 dev->netdev_ops = &vlan_netdev_ops; 574 575 SET_NETDEV_DEVTYPE(dev, &vlan_type); 576 577 netdev_lockdep_set_classes(dev); 578 579 vlan->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats); 580 if (!vlan->vlan_pcpu_stats) 581 return -ENOMEM; 582 583 /* Get vlan's reference to real_dev */ 584 netdev_hold(real_dev, &vlan->dev_tracker, GFP_KERNEL); 585 586 return 0; 587 } 588 589 /* Note: this function might be called multiple times for the same device. */ 590 void vlan_dev_free_egress_priority(const struct net_device *dev) 591 { 592 struct vlan_priority_tci_mapping *pm; 593 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 594 int i; 595 596 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { 597 pm = rtnl_dereference(vlan->egress_priority_map[i]); 598 RCU_INIT_POINTER(vlan->egress_priority_map[i], NULL); 599 while (pm) { 600 struct vlan_priority_tci_mapping *next; 601 602 next = rtnl_dereference(pm->next); 603 kfree_rcu(pm, rcu); 604 pm = next; 605 } 606 } 607 vlan->nr_egress_mappings = 0; 608 } 609 610 static void vlan_dev_uninit(struct net_device *dev) 611 { 612 vlan_dev_free_egress_priority(dev); 613 } 614 615 static netdev_features_t vlan_dev_fix_features(struct net_device *dev, 616 netdev_features_t features) 617 { 618 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 619 netdev_features_t old_features = features; 620 netdev_features_t lower_features; 621 622 lower_features = netdev_intersect_features((real_dev->vlan_features | 623 NETIF_F_RXCSUM), 624 real_dev->features); 625 626 /* Add HW_CSUM setting to preserve user ability to control 627 * checksum offload on the vlan device. 628 */ 629 if (lower_features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM)) 630 lower_features |= NETIF_F_HW_CSUM; 631 features = netdev_intersect_features(features, lower_features); 632 features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE); 633 634 return features; 635 } 636 637 static int vlan_ethtool_get_link_ksettings(struct net_device *dev, 638 struct ethtool_link_ksettings *cmd) 639 { 640 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 641 642 return __ethtool_get_link_ksettings(vlan->real_dev, cmd); 643 } 644 645 static void vlan_ethtool_get_drvinfo(struct net_device *dev, 646 struct ethtool_drvinfo *info) 647 { 648 strscpy(info->driver, vlan_fullname, sizeof(info->driver)); 649 strscpy(info->version, vlan_version, sizeof(info->version)); 650 strscpy(info->fw_version, "N/A", sizeof(info->fw_version)); 651 } 652 653 static int vlan_ethtool_get_ts_info(struct net_device *dev, 654 struct kernel_ethtool_ts_info *info) 655 { 656 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 657 return ethtool_get_ts_info_by_layer(vlan->real_dev, info); 658 } 659 660 static void vlan_dev_get_stats64(struct net_device *dev, 661 struct rtnl_link_stats64 *stats) 662 { 663 struct vlan_pcpu_stats *p; 664 u32 rx_errors = 0, tx_dropped = 0; 665 int i; 666 667 for_each_possible_cpu(i) { 668 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes; 669 unsigned int start; 670 671 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i); 672 do { 673 start = u64_stats_fetch_begin(&p->syncp); 674 rxpackets = u64_stats_read(&p->rx_packets); 675 rxbytes = u64_stats_read(&p->rx_bytes); 676 rxmulticast = u64_stats_read(&p->rx_multicast); 677 txpackets = u64_stats_read(&p->tx_packets); 678 txbytes = u64_stats_read(&p->tx_bytes); 679 } while (u64_stats_fetch_retry(&p->syncp, start)); 680 681 stats->rx_packets += rxpackets; 682 stats->rx_bytes += rxbytes; 683 stats->multicast += rxmulticast; 684 stats->tx_packets += txpackets; 685 stats->tx_bytes += txbytes; 686 /* rx_errors & tx_dropped are u32 */ 687 rx_errors += READ_ONCE(p->rx_errors); 688 tx_dropped += READ_ONCE(p->tx_dropped); 689 } 690 stats->rx_errors = rx_errors; 691 stats->tx_dropped = tx_dropped; 692 } 693 694 #ifdef CONFIG_NET_POLL_CONTROLLER 695 static void vlan_dev_poll_controller(struct net_device *dev) 696 { 697 return; 698 } 699 700 static int vlan_dev_netpoll_setup(struct net_device *dev) 701 { 702 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 703 struct net_device *real_dev = vlan->real_dev; 704 struct netpoll *netpoll; 705 int err = 0; 706 707 netpoll = kzalloc_obj(*netpoll); 708 err = -ENOMEM; 709 if (!netpoll) 710 goto out; 711 712 err = __netpoll_setup(netpoll, real_dev); 713 if (err) { 714 kfree(netpoll); 715 goto out; 716 } 717 718 vlan->netpoll = netpoll; 719 720 out: 721 return err; 722 } 723 724 static void vlan_dev_netpoll_cleanup(struct net_device *dev) 725 { 726 struct vlan_dev_priv *vlan= vlan_dev_priv(dev); 727 struct netpoll *netpoll = vlan->netpoll; 728 729 if (!netpoll) 730 return; 731 732 vlan->netpoll = NULL; 733 __netpoll_free(netpoll); 734 } 735 #endif /* CONFIG_NET_POLL_CONTROLLER */ 736 737 static int vlan_dev_get_iflink(const struct net_device *dev) 738 { 739 const struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; 740 741 return READ_ONCE(real_dev->ifindex); 742 } 743 744 static int vlan_dev_fill_forward_path(struct net_device_path_ctx *ctx, 745 struct net_device_path *path) 746 { 747 struct vlan_dev_priv *vlan = vlan_dev_priv(ctx->dev); 748 749 path->type = DEV_PATH_VLAN; 750 path->encap.id = vlan->vlan_id; 751 path->encap.proto = vlan->vlan_proto; 752 path->dev = ctx->dev; 753 ctx->dev = vlan->real_dev; 754 if (ctx->num_vlans >= ARRAY_SIZE(ctx->vlan)) 755 return -ENOSPC; 756 757 ctx->vlan[ctx->num_vlans].id = vlan->vlan_id; 758 ctx->vlan[ctx->num_vlans].proto = vlan->vlan_proto; 759 ctx->num_vlans++; 760 761 return 0; 762 } 763 764 #if IS_ENABLED(CONFIG_MACSEC) 765 766 static const struct macsec_ops *vlan_get_macsec_ops(const struct macsec_context *ctx) 767 { 768 return vlan_dev_priv(ctx->netdev)->real_dev->macsec_ops; 769 } 770 771 static int vlan_macsec_offload(int (* const func)(struct macsec_context *), 772 struct macsec_context *ctx) 773 { 774 if (unlikely(!func)) 775 return 0; 776 777 return (*func)(ctx); 778 } 779 780 static int vlan_macsec_dev_open(struct macsec_context *ctx) 781 { 782 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 783 784 if (!ops) 785 return -EOPNOTSUPP; 786 787 return vlan_macsec_offload(ops->mdo_dev_open, ctx); 788 } 789 790 static int vlan_macsec_dev_stop(struct macsec_context *ctx) 791 { 792 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 793 794 if (!ops) 795 return -EOPNOTSUPP; 796 797 return vlan_macsec_offload(ops->mdo_dev_stop, ctx); 798 } 799 800 static int vlan_macsec_add_secy(struct macsec_context *ctx) 801 { 802 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 803 804 if (!ops) 805 return -EOPNOTSUPP; 806 807 return vlan_macsec_offload(ops->mdo_add_secy, ctx); 808 } 809 810 static int vlan_macsec_upd_secy(struct macsec_context *ctx) 811 { 812 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 813 814 if (!ops) 815 return -EOPNOTSUPP; 816 817 return vlan_macsec_offload(ops->mdo_upd_secy, ctx); 818 } 819 820 static int vlan_macsec_del_secy(struct macsec_context *ctx) 821 { 822 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 823 824 if (!ops) 825 return -EOPNOTSUPP; 826 827 return vlan_macsec_offload(ops->mdo_del_secy, ctx); 828 } 829 830 static int vlan_macsec_add_rxsc(struct macsec_context *ctx) 831 { 832 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 833 834 if (!ops) 835 return -EOPNOTSUPP; 836 837 return vlan_macsec_offload(ops->mdo_add_rxsc, ctx); 838 } 839 840 static int vlan_macsec_upd_rxsc(struct macsec_context *ctx) 841 { 842 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 843 844 if (!ops) 845 return -EOPNOTSUPP; 846 847 return vlan_macsec_offload(ops->mdo_upd_rxsc, ctx); 848 } 849 850 static int vlan_macsec_del_rxsc(struct macsec_context *ctx) 851 { 852 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 853 854 if (!ops) 855 return -EOPNOTSUPP; 856 857 return vlan_macsec_offload(ops->mdo_del_rxsc, ctx); 858 } 859 860 static int vlan_macsec_add_rxsa(struct macsec_context *ctx) 861 { 862 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 863 864 if (!ops) 865 return -EOPNOTSUPP; 866 867 return vlan_macsec_offload(ops->mdo_add_rxsa, ctx); 868 } 869 870 static int vlan_macsec_upd_rxsa(struct macsec_context *ctx) 871 { 872 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 873 874 if (!ops) 875 return -EOPNOTSUPP; 876 877 return vlan_macsec_offload(ops->mdo_upd_rxsa, ctx); 878 } 879 880 static int vlan_macsec_del_rxsa(struct macsec_context *ctx) 881 { 882 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 883 884 if (!ops) 885 return -EOPNOTSUPP; 886 887 return vlan_macsec_offload(ops->mdo_del_rxsa, ctx); 888 } 889 890 static int vlan_macsec_add_txsa(struct macsec_context *ctx) 891 { 892 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 893 894 if (!ops) 895 return -EOPNOTSUPP; 896 897 return vlan_macsec_offload(ops->mdo_add_txsa, ctx); 898 } 899 900 static int vlan_macsec_upd_txsa(struct macsec_context *ctx) 901 { 902 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 903 904 if (!ops) 905 return -EOPNOTSUPP; 906 907 return vlan_macsec_offload(ops->mdo_upd_txsa, ctx); 908 } 909 910 static int vlan_macsec_del_txsa(struct macsec_context *ctx) 911 { 912 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 913 914 if (!ops) 915 return -EOPNOTSUPP; 916 917 return vlan_macsec_offload(ops->mdo_del_txsa, ctx); 918 } 919 920 static int vlan_macsec_get_dev_stats(struct macsec_context *ctx) 921 { 922 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 923 924 if (!ops) 925 return -EOPNOTSUPP; 926 927 return vlan_macsec_offload(ops->mdo_get_dev_stats, ctx); 928 } 929 930 static int vlan_macsec_get_tx_sc_stats(struct macsec_context *ctx) 931 { 932 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 933 934 if (!ops) 935 return -EOPNOTSUPP; 936 937 return vlan_macsec_offload(ops->mdo_get_tx_sc_stats, ctx); 938 } 939 940 static int vlan_macsec_get_tx_sa_stats(struct macsec_context *ctx) 941 { 942 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 943 944 if (!ops) 945 return -EOPNOTSUPP; 946 947 return vlan_macsec_offload(ops->mdo_get_tx_sa_stats, ctx); 948 } 949 950 static int vlan_macsec_get_rx_sc_stats(struct macsec_context *ctx) 951 { 952 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 953 954 if (!ops) 955 return -EOPNOTSUPP; 956 957 return vlan_macsec_offload(ops->mdo_get_rx_sc_stats, ctx); 958 } 959 960 static int vlan_macsec_get_rx_sa_stats(struct macsec_context *ctx) 961 { 962 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx); 963 964 if (!ops) 965 return -EOPNOTSUPP; 966 967 return vlan_macsec_offload(ops->mdo_get_rx_sa_stats, ctx); 968 } 969 970 static const struct macsec_ops macsec_offload_ops = { 971 /* Device wide */ 972 .mdo_dev_open = vlan_macsec_dev_open, 973 .mdo_dev_stop = vlan_macsec_dev_stop, 974 /* SecY */ 975 .mdo_add_secy = vlan_macsec_add_secy, 976 .mdo_upd_secy = vlan_macsec_upd_secy, 977 .mdo_del_secy = vlan_macsec_del_secy, 978 /* Security channels */ 979 .mdo_add_rxsc = vlan_macsec_add_rxsc, 980 .mdo_upd_rxsc = vlan_macsec_upd_rxsc, 981 .mdo_del_rxsc = vlan_macsec_del_rxsc, 982 /* Security associations */ 983 .mdo_add_rxsa = vlan_macsec_add_rxsa, 984 .mdo_upd_rxsa = vlan_macsec_upd_rxsa, 985 .mdo_del_rxsa = vlan_macsec_del_rxsa, 986 .mdo_add_txsa = vlan_macsec_add_txsa, 987 .mdo_upd_txsa = vlan_macsec_upd_txsa, 988 .mdo_del_txsa = vlan_macsec_del_txsa, 989 /* Statistics */ 990 .mdo_get_dev_stats = vlan_macsec_get_dev_stats, 991 .mdo_get_tx_sc_stats = vlan_macsec_get_tx_sc_stats, 992 .mdo_get_tx_sa_stats = vlan_macsec_get_tx_sa_stats, 993 .mdo_get_rx_sc_stats = vlan_macsec_get_rx_sc_stats, 994 .mdo_get_rx_sa_stats = vlan_macsec_get_rx_sa_stats, 995 }; 996 997 #endif 998 999 static const struct ethtool_ops vlan_ethtool_ops = { 1000 .get_link_ksettings = vlan_ethtool_get_link_ksettings, 1001 .get_drvinfo = vlan_ethtool_get_drvinfo, 1002 .get_link = ethtool_op_get_link, 1003 .get_ts_info = vlan_ethtool_get_ts_info, 1004 }; 1005 1006 static void vlan_transfer_features(struct net_device *dev, 1007 struct net_device *vlandev) 1008 { 1009 struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev); 1010 1011 netif_inherit_tso_max(vlandev, dev); 1012 1013 vlandev->needed_headroom = dev->needed_headroom + VLAN_HLEN; 1014 vlandev->needed_tailroom = dev->needed_tailroom; 1015 vlandev->hard_header_len = dev->hard_header_len; 1016 1017 #if IS_ENABLED(CONFIG_FCOE) 1018 vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid; 1019 #endif 1020 1021 vlandev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 1022 vlandev->priv_flags |= (vlan->real_dev->priv_flags & IFF_XMIT_DST_RELEASE); 1023 vlandev->hw_enc_features = vlan_tnl_features(vlan->real_dev); 1024 1025 netdev_update_features(vlandev); 1026 } 1027 1028 static void vlan_dev_work(struct net_device *vlandev, unsigned long events) 1029 { 1030 struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev); 1031 struct net_device *real_dev = vlan->real_dev; 1032 bool loose = vlan->flags & VLAN_FLAG_LOOSE_BINDING; 1033 unsigned int flgs; 1034 1035 if (events & VLAN_WORK_LINK_STATE) { 1036 flgs = netif_get_flags(vlandev); 1037 if (real_dev->flags & IFF_UP) { 1038 if (!(flgs & IFF_UP)) { 1039 if (!loose) 1040 netif_change_flags(vlandev, 1041 flgs | IFF_UP, NULL); 1042 vlan_stacked_transfer_operstate(real_dev, 1043 vlandev, vlan); 1044 } 1045 } else if ((flgs & IFF_UP) && !loose) { 1046 netif_change_flags(vlandev, flgs & ~IFF_UP, NULL); 1047 vlan_stacked_transfer_operstate(real_dev, vlandev, vlan); 1048 } 1049 } 1050 1051 if ((events & VLAN_WORK_MTU) && vlandev->mtu > real_dev->mtu) 1052 netif_set_mtu(vlandev, real_dev->mtu); 1053 1054 if (events & VLAN_WORK_FEATURES) 1055 vlan_transfer_features(real_dev, vlandev); 1056 } 1057 1058 static const struct net_device_ops vlan_netdev_ops = { 1059 .ndo_change_mtu = vlan_dev_change_mtu, 1060 .ndo_init = vlan_dev_init, 1061 .ndo_uninit = vlan_dev_uninit, 1062 .ndo_open = vlan_dev_open, 1063 .ndo_stop = vlan_dev_stop, 1064 .ndo_start_xmit = vlan_dev_hard_start_xmit, 1065 .ndo_validate_addr = eth_validate_addr, 1066 .ndo_set_mac_address = vlan_dev_set_mac_address, 1067 .ndo_set_rx_mode = vlan_dev_set_rx_mode, 1068 .ndo_change_rx_flags = vlan_dev_change_rx_flags, 1069 .ndo_work = vlan_dev_work, 1070 .ndo_eth_ioctl = vlan_dev_ioctl, 1071 .ndo_neigh_setup = vlan_dev_neigh_setup, 1072 .ndo_get_stats64 = vlan_dev_get_stats64, 1073 #if IS_ENABLED(CONFIG_FCOE) 1074 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup, 1075 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done, 1076 .ndo_fcoe_enable = vlan_dev_fcoe_enable, 1077 .ndo_fcoe_disable = vlan_dev_fcoe_disable, 1078 .ndo_fcoe_ddp_target = vlan_dev_fcoe_ddp_target, 1079 #endif 1080 #ifdef NETDEV_FCOE_WWNN 1081 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn, 1082 #endif 1083 #ifdef CONFIG_NET_POLL_CONTROLLER 1084 .ndo_poll_controller = vlan_dev_poll_controller, 1085 .ndo_netpoll_setup = vlan_dev_netpoll_setup, 1086 .ndo_netpoll_cleanup = vlan_dev_netpoll_cleanup, 1087 #endif 1088 .ndo_fix_features = vlan_dev_fix_features, 1089 .ndo_get_iflink = vlan_dev_get_iflink, 1090 .ndo_fill_forward_path = vlan_dev_fill_forward_path, 1091 .ndo_hwtstamp_get = vlan_hwtstamp_get, 1092 .ndo_hwtstamp_set = vlan_hwtstamp_set, 1093 }; 1094 1095 static void vlan_dev_free(struct net_device *dev) 1096 { 1097 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 1098 1099 free_percpu(vlan->vlan_pcpu_stats); 1100 vlan->vlan_pcpu_stats = NULL; 1101 1102 /* Get rid of the vlan's reference to real_dev */ 1103 netdev_put(vlan->real_dev, &vlan->dev_tracker); 1104 } 1105 1106 void vlan_setup(struct net_device *dev) 1107 { 1108 ether_setup(dev); 1109 1110 dev->priv_flags |= IFF_802_1Q_VLAN | IFF_NO_QUEUE; 1111 dev->priv_flags |= IFF_UNICAST_FLT; 1112 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1113 netif_keep_dst(dev); 1114 1115 dev->netdev_ops = &vlan_netdev_ops; 1116 dev->needs_free_netdev = true; 1117 dev->priv_destructor = vlan_dev_free; 1118 dev->ethtool_ops = &vlan_ethtool_ops; 1119 1120 #if IS_ENABLED(CONFIG_MACSEC) 1121 dev->macsec_ops = &macsec_offload_ops; 1122 #endif 1123 dev->min_mtu = 0; 1124 dev->max_mtu = ETH_MAX_MTU; 1125 1126 eth_zero_addr(dev->broadcast); 1127 } 1128