net/8021q/vlan_dev.c

   1 /* -*- linux-c -*-
   2  * INET         802.1Q VLAN
   3  *              Ethernet-type device handling.
   4  *
   5  * Authors:     Ben Greear <greearb@candelatech.com>
   6  *              Please send support related email to: netdev@vger.kernel.org
   7  *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
   8  *
   9  * Fixes:       Mar 22 2001: Martin Bokaemper <mbokaemper@unispherenetworks.com>
  10  *                - reset skb->pkt_type on incoming packets when MAC was changed
  11  *                - see that changed MAC is saddr for outgoing packets
  12  *              Oct 20, 2001:  Ard van Breeman:
  13  *                - Fix MC-list, finally.
  14  *                - Flush MC-list on VLAN destroy.
  15  *
  16  *
  17  *              This program is free software; you can redistribute it and/or
  18  *              modify it under the terms of the GNU General Public License
  19  *              as published by the Free Software Foundation; either version
  20  *              2 of the License, or (at your option) any later version.
  21  */
  22
  23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  24
  25 #include <linux/module.h>
  26 #include <linux/slab.h>
  27 #include <linux/skbuff.h>
  28 #include <linux/netdevice.h>
  29 #include <linux/net_tstamp.h>
  30 #include <linux/etherdevice.h>
  31 #include <linux/ethtool.h>
  32 #include <net/arp.h>
  33 #include <net/switchdev.h>
  34
  35 #include "vlan.h"
  36 #include "vlanproc.h"
  37 #include <linux/if_vlan.h>
  38 #include <linux/netpoll.h>
  39
  40 /*
  41  *      Create the VLAN header for an arbitrary protocol layer
  42  *
  43  *      saddr=NULL      means use device source address
  44  *      daddr=NULL      means leave destination address (eg unresolved arp)
  45  *
  46  *  This is called when the SKB is moving down the stack towards the
  47  *  physical devices.
  48  */
  49 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
  50                                 unsigned short type,
  51                                 const void *daddr, const void *saddr,
  52                                 unsigned int len)
  53 {
  54         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
  55         struct vlan_hdr *vhdr;
  56         unsigned int vhdrlen = 0;
  57         u16 vlan_tci = 0;
  58         int rc;
  59
  60         if (!(vlan->flags & VLAN_FLAG_REORDER_HDR)) {
  61                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
  62
  63                 vlan_tci = vlan->vlan_id;
  64                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
  65                 vhdr->h_vlan_TCI = htons(vlan_tci);
  66
  67                 /*
  68                  *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
  69                  *  put the length in here instead.
  70                  */
  71                 if (type != ETH_P_802_3 && type != ETH_P_802_2)
  72                         vhdr->h_vlan_encapsulated_proto = htons(type);
  73                 else
  74                         vhdr->h_vlan_encapsulated_proto = htons(len);
  75
  76                 skb->protocol = vlan->vlan_proto;
  77                 type = ntohs(vlan->vlan_proto);
  78                 vhdrlen = VLAN_HLEN;
  79         }
  80
  81         /* Before delegating work to the lower layer, enter our MAC-address */
  82         if (saddr == NULL)
  83                 saddr = dev->dev_addr;
  84
  85         /* Now make the underlying real hard header */
  86         dev = vlan->real_dev;
  87         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
  88         if (rc > 0)
  89                 rc += vhdrlen;
  90         return rc;
  91 }
  92
  93 static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb)
  94 {
  95 #ifdef CONFIG_NET_POLL_CONTROLLER
  96         if (vlan->netpoll)
  97                 netpoll_send_skb(vlan->netpoll, skb);
  98 #else
  99         BUG();
 100 #endif
 101         return NETDEV_TX_OK;
 102 }
 103
 104 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
 105                                             struct net_device *dev)
 106 {
 107         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 108         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 109         unsigned int len;
 110         int ret;
 111
 112         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
 113          *
 114          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
 115          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
 116          */
 117         if (veth->h_vlan_proto != vlan->vlan_proto ||
 118             vlan->flags & VLAN_FLAG_REORDER_HDR) {
 119                 u16 vlan_tci;
 120                 vlan_tci = vlan->vlan_id;
 121                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
 122                 __vlan_hwaccel_put_tag(skb, vlan->vlan_proto, vlan_tci);
 123         }
 124
 125         skb->dev = vlan->real_dev;
 126         len = skb->len;
 127         if (unlikely(netpoll_tx_running(dev)))
 128                 return vlan_netpoll_send_skb(vlan, skb);
 129
 130         ret = dev_queue_xmit(skb);
 131
 132         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 133                 struct vlan_pcpu_stats *stats;
 134
 135                 stats = this_cpu_ptr(vlan->vlan_pcpu_stats);
 136                 u64_stats_update_begin(&stats->syncp);
 137                 stats->tx_packets++;
 138                 stats->tx_bytes += len;
 139                 u64_stats_update_end(&stats->syncp);
 140         } else {
 141                 this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped);
 142         }
 143
 144         return ret;
 145 }
 146
 147 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
 148 {
 149         /* TODO: gotta make sure the underlying layer can handle it,
 150          * maybe an IFF_VLAN_CAPABLE flag for devices?
 151          */
 152         if (vlan_dev_priv(dev)->real_dev->mtu < new_mtu)
 153                 return -ERANGE;
 154
 155         dev->mtu = new_mtu;
 156
 157         return 0;
 158 }
 159
 160 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 161                                    u32 skb_prio, u16 vlan_prio)
 162 {
 163         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 164
 165         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
 166                 vlan->nr_ingress_mappings--;
 167         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
 168                 vlan->nr_ingress_mappings++;
 169
 170         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 171 }
 172
 173 int vlan_dev_set_egress_priority(const struct net_device *dev,
 174                                  u32 skb_prio, u16 vlan_prio)
 175 {
 176         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 177         struct vlan_priority_tci_mapping *mp = NULL;
 178         struct vlan_priority_tci_mapping *np;
 179         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
 180
 181         /* See if a priority mapping exists.. */
 182         mp = vlan->egress_priority_map[skb_prio & 0xF];
 183         while (mp) {
 184                 if (mp->priority == skb_prio) {
 185                         if (mp->vlan_qos && !vlan_qos)
 186                                 vlan->nr_egress_mappings--;
 187                         else if (!mp->vlan_qos && vlan_qos)
 188                                 vlan->nr_egress_mappings++;
 189                         mp->vlan_qos = vlan_qos;
 190                         return 0;
 191                 }
 192                 mp = mp->next;
 193         }
 194
 195         /* Create a new mapping then. */
 196         mp = vlan->egress_priority_map[skb_prio & 0xF];
 197         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 198         if (!np)
 199                 return -ENOBUFS;
 200
 201         np->next = mp;
 202         np->priority = skb_prio;
 203         np->vlan_qos = vlan_qos;
 204         /* Before inserting this element in hash table, make sure all its fields
 205          * are committed to memory.
 206          * coupled with smp_rmb() in vlan_dev_get_egress_qos_mask()
 207          */
 208         smp_wmb();
 209         vlan->egress_priority_map[skb_prio & 0xF] = np;
 210         if (vlan_qos)
 211                 vlan->nr_egress_mappings++;
 212         return 0;
 213 }
 214
 215 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
 216 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 217 {
 218         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 219         u32 old_flags = vlan->flags;
 220
 221         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
 222                      VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
 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)
 244 {
 245         strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23);
 246 }
 247
 248 static int vlan_dev_open(struct net_device *dev)
 249 {
 250         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 251         struct net_device *real_dev = vlan->real_dev;
 252         int err;
 253
 254         if (!(real_dev->flags & IFF_UP) &&
 255             !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 256                 return -ENETDOWN;
 257
 258         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) {
 259                 err = dev_uc_add(real_dev, dev->dev_addr);
 260                 if (err < 0)
 261                         goto out;
 262         }
 263
 264         if (dev->flags & IFF_ALLMULTI) {
 265                 err = dev_set_allmulti(real_dev, 1);
 266                 if (err < 0)
 267                         goto del_unicast;
 268         }
 269         if (dev->flags & IFF_PROMISC) {
 270                 err = dev_set_promiscuity(real_dev, 1);
 271                 if (err < 0)
 272                         goto clear_allmulti;
 273         }
 274
 275         ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr);
 276
 277         if (vlan->flags & VLAN_FLAG_GVRP)
 278                 vlan_gvrp_request_join(dev);
 279
 280         if (vlan->flags & VLAN_FLAG_MVRP)
 281                 vlan_mvrp_request_join(dev);
 282
 283         if (netif_carrier_ok(real_dev))
 284                 netif_carrier_on(dev);
 285         return 0;
 286
 287 clear_allmulti:
 288         if (dev->flags & IFF_ALLMULTI)
 289                 dev_set_allmulti(real_dev, -1);
 290 del_unicast:
 291         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 292                 dev_uc_del(real_dev, dev->dev_addr);
 293 out:
 294         netif_carrier_off(dev);
 295         return err;
 296 }
 297
 298 static int vlan_dev_stop(struct net_device *dev)
 299 {
 300         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 301         struct net_device *real_dev = vlan->real_dev;
 302
 303         dev_mc_unsync(real_dev, dev);
 304         dev_uc_unsync(real_dev, dev);
 305         if (dev->flags & IFF_ALLMULTI)
 306                 dev_set_allmulti(real_dev, -1);
 307         if (dev->flags & IFF_PROMISC)
 308                 dev_set_promiscuity(real_dev, -1);
 309
 310         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 311                 dev_uc_del(real_dev, dev->dev_addr);
 312
 313         netif_carrier_off(dev);
 314         return 0;
 315 }
 316
 317 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 318 {
 319         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 320         struct sockaddr *addr = p;
 321         int err;
 322
 323         if (!is_valid_ether_addr(addr->sa_data))
 324                 return -EADDRNOTAVAIL;
 325
 326         if (!(dev->flags & IFF_UP))
 327                 goto out;
 328
 329         if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) {
 330                 err = dev_uc_add(real_dev, addr->sa_data);
 331                 if (err < 0)
 332                         return err;
 333         }
 334
 335         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 336                 dev_uc_del(real_dev, dev->dev_addr);
 337
 338 out:
 339         ether_addr_copy(dev->dev_addr, addr->sa_data);
 340         return 0;
 341 }
 342
 343 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 344 {
 345         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 346         const struct net_device_ops *ops = real_dev->netdev_ops;
 347         struct ifreq ifrr;
 348         int err = -EOPNOTSUPP;
 349
 350         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 351         ifrr.ifr_ifru = ifr->ifr_ifru;
 352
 353         switch (cmd) {
 354         case SIOCGMIIPHY:
 355         case SIOCGMIIREG:
 356         case SIOCSMIIREG:
 357         case SIOCSHWTSTAMP:
 358         case SIOCGHWTSTAMP:
 359                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
 360                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
 361                 break;
 362         }
 363
 364         if (!err)
 365                 ifr->ifr_ifru = ifrr.ifr_ifru;
 366
 367         return err;
 368 }
 369
 370 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
 371 {
 372         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 373         const struct net_device_ops *ops = real_dev->netdev_ops;
 374         int err = 0;
 375
 376         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
 377                 err = ops->ndo_neigh_setup(real_dev, pa);
 378
 379         return err;
 380 }
 381
 382 #if IS_ENABLED(CONFIG_FCOE)
 383 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
 384                                    struct scatterlist *sgl, unsigned int sgc)
 385 {
 386         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 387         const struct net_device_ops *ops = real_dev->netdev_ops;
 388         int rc = 0;
 389
 390         if (ops->ndo_fcoe_ddp_setup)
 391                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
 392
 393         return rc;
 394 }
 395
 396 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
 397 {
 398         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 399         const struct net_device_ops *ops = real_dev->netdev_ops;
 400         int len = 0;
 401
 402         if (ops->ndo_fcoe_ddp_done)
 403                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
 404
 405         return len;
 406 }
 407
 408 static int vlan_dev_fcoe_enable(struct net_device *dev)
 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 = -EINVAL;
 413
 414         if (ops->ndo_fcoe_enable)
 415                 rc = ops->ndo_fcoe_enable(real_dev);
 416         return rc;
 417 }
 418
 419 static int vlan_dev_fcoe_disable(struct net_device *dev)
 420 {
 421         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 422         const struct net_device_ops *ops = real_dev->netdev_ops;
 423         int rc = -EINVAL;
 424
 425         if (ops->ndo_fcoe_disable)
 426                 rc = ops->ndo_fcoe_disable(real_dev);
 427         return rc;
 428 }
 429
 430 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
 431 {
 432         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 433         const struct net_device_ops *ops = real_dev->netdev_ops;
 434         int rc = -EINVAL;
 435
 436         if (ops->ndo_fcoe_get_wwn)
 437                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
 438         return rc;
 439 }
 440
 441 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
 442                                     struct scatterlist *sgl, unsigned int sgc)
 443 {
 444         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 445         const struct net_device_ops *ops = real_dev->netdev_ops;
 446         int rc = 0;
 447
 448         if (ops->ndo_fcoe_ddp_target)
 449                 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
 450
 451         return rc;
 452 }
 453 #endif
 454
 455 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 456 {
 457         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 458
 459         if (dev->flags & IFF_UP) {
 460                 if (change & IFF_ALLMULTI)
 461                         dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 462                 if (change & IFF_PROMISC)
 463                         dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 464         }
 465 }
 466
 467 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 468 {
 469         dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 470         dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 471 }
 472
 473 /*
 474  * vlan network devices have devices nesting below it, and are a special
 475  * "super class" of normal network devices; split their locks off into a
 476  * separate class since they always nest.
 477  */
 478 static struct lock_class_key vlan_netdev_xmit_lock_key;
 479 static struct lock_class_key vlan_netdev_addr_lock_key;
 480
 481 static void vlan_dev_set_lockdep_one(struct net_device *dev,
 482                                      struct netdev_queue *txq,
 483                                      void *_subclass)
 484 {
 485         lockdep_set_class_and_subclass(&txq->_xmit_lock,
 486                                        &vlan_netdev_xmit_lock_key,
 487                                        *(int *)_subclass);
 488 }
 489
 490 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
 491 {
 492         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 493                                        &vlan_netdev_addr_lock_key,
 494                                        subclass);
 495         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
 496 }
 497
 498 static int vlan_dev_get_lock_subclass(struct net_device *dev)
 499 {
 500         return vlan_dev_priv(dev)->nest_level;
 501 }
 502
 503 static const struct header_ops vlan_header_ops = {
 504         .create  = vlan_dev_hard_header,
 505         .parse   = eth_header_parse,
 506 };
 507
 508 static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
 509                                      unsigned short type,
 510                                      const void *daddr, const void *saddr,
 511                                      unsigned int len)
 512 {
 513         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 514         struct net_device *real_dev = vlan->real_dev;
 515
 516         if (saddr == NULL)
 517                 saddr = dev->dev_addr;
 518
 519         return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
 520 }
 521
 522 static const struct header_ops vlan_passthru_header_ops = {
 523         .create  = vlan_passthru_hard_header,
 524         .parse   = eth_header_parse,
 525 };
 526
 527 static struct device_type vlan_type = {
 528         .name   = "vlan",
 529 };
 530
 531 static const struct net_device_ops vlan_netdev_ops;
 532
 533 static int vlan_dev_init(struct net_device *dev)
 534 {
 535         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 536
 537         netif_carrier_off(dev);
 538
 539         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 540         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
 541                                           IFF_MASTER | IFF_SLAVE);
 542         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 543                                           (1<<__LINK_STATE_DORMANT))) |
 544                       (1<<__LINK_STATE_PRESENT);
 545
 546         dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG |
 547                            NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
 548                            NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC |
 549                            NETIF_F_ALL_FCOE;
 550
 551         dev->features |= real_dev->vlan_features | NETIF_F_LLTX |
 552                          NETIF_F_GSO_SOFTWARE;
 553         dev->gso_max_size = real_dev->gso_max_size;
 554         dev->gso_max_segs = real_dev->gso_max_segs;
 555         if (dev->features & NETIF_F_VLAN_FEATURES)
 556                 netdev_warn(real_dev, "VLAN features are set incorrectly.  Q-in-Q configurations may not work correctly.\n");
 557
 558         dev->vlan_features = real_dev->vlan_features & ~NETIF_F_ALL_FCOE;
 559
 560         /* ipv6 shared card related stuff */
 561         dev->dev_id = real_dev->dev_id;
 562
 563         if (is_zero_ether_addr(dev->dev_addr))
 564                 eth_hw_addr_inherit(dev, real_dev);
 565         if (is_zero_ether_addr(dev->broadcast))
 566                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 567
 568 #if IS_ENABLED(CONFIG_FCOE)
 569         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
 570 #endif
 571
 572         dev->needed_headroom = real_dev->needed_headroom;
 573         if (vlan_hw_offload_capable(real_dev->features,
 574                                     vlan_dev_priv(dev)->vlan_proto)) {
 575                 dev->header_ops      = &vlan_passthru_header_ops;
 576                 dev->hard_header_len = real_dev->hard_header_len;
 577         } else {
 578                 dev->header_ops      = &vlan_header_ops;
 579                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 580         }
 581
 582         dev->netdev_ops = &vlan_netdev_ops;
 583
 584         SET_NETDEV_DEVTYPE(dev, &vlan_type);
 585
 586         vlan_dev_set_lockdep_class(dev, vlan_dev_get_lock_subclass(dev));
 587
 588         vlan_dev_priv(dev)->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 589         if (!vlan_dev_priv(dev)->vlan_pcpu_stats)
 590                 return -ENOMEM;
 591
 592         return 0;
 593 }
 594
 595 static void vlan_dev_uninit(struct net_device *dev)
 596 {
 597         struct vlan_priority_tci_mapping *pm;
 598         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 599         int i;
 600
 601         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 602                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 603                         vlan->egress_priority_map[i] = pm->next;
 604                         kfree(pm);
 605                 }
 606         }
 607 }
 608
 609 static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
 610         netdev_features_t features)
 611 {
 612         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 613         netdev_features_t old_features = features;
 614
 615         features = netdev_intersect_features(features, real_dev->vlan_features);
 616         features |= NETIF_F_RXCSUM;
 617         features = netdev_intersect_features(features, real_dev->features);
 618
 619         features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE);
 620         features |= NETIF_F_LLTX;
 621
 622         return features;
 623 }
 624
 625 static int vlan_ethtool_get_link_ksettings(struct net_device *dev,
 626                                            struct ethtool_link_ksettings *cmd)
 627 {
 628         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 629
 630         return __ethtool_get_link_ksettings(vlan->real_dev, cmd);
 631 }
 632
 633 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
 634                                      struct ethtool_drvinfo *info)
 635 {
 636         strlcpy(info->driver, vlan_fullname, sizeof(info->driver));
 637         strlcpy(info->version, vlan_version, sizeof(info->version));
 638         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
 639 }
 640
 641 static int vlan_ethtool_get_ts_info(struct net_device *dev,
 642                                     struct ethtool_ts_info *info)
 643 {
 644         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 645         const struct ethtool_ops *ops = vlan->real_dev->ethtool_ops;
 646
 647         if (ops->get_ts_info) {
 648                 return ops->get_ts_info(vlan->real_dev, info);
 649         } else {
 650                 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
 651                         SOF_TIMESTAMPING_SOFTWARE;
 652                 info->phc_index = -1;
 653         }
 654
 655         return 0;
 656 }
 657
 658 static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 659 {
 660         struct vlan_pcpu_stats *p;
 661         u32 rx_errors = 0, tx_dropped = 0;
 662         int i;
 663
 664         for_each_possible_cpu(i) {
 665                 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
 666                 unsigned int start;
 667
 668                 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
 669                 do {
 670                         start = u64_stats_fetch_begin_irq(&p->syncp);
 671                         rxpackets       = p->rx_packets;
 672                         rxbytes         = p->rx_bytes;
 673                         rxmulticast     = p->rx_multicast;
 674                         txpackets       = p->tx_packets;
 675                         txbytes         = p->tx_bytes;
 676                 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
 677
 678                 stats->rx_packets       += rxpackets;
 679                 stats->rx_bytes         += rxbytes;
 680                 stats->multicast        += rxmulticast;
 681                 stats->tx_packets       += txpackets;
 682                 stats->tx_bytes         += txbytes;
 683                 /* rx_errors & tx_dropped are u32 */
 684                 rx_errors       += p->rx_errors;
 685                 tx_dropped      += p->tx_dropped;
 686         }
 687         stats->rx_errors  = rx_errors;
 688         stats->tx_dropped = tx_dropped;
 689
 690         return stats;
 691 }
 692
 693 #ifdef CONFIG_NET_POLL_CONTROLLER
 694 static void vlan_dev_poll_controller(struct net_device *dev)
 695 {
 696         return;
 697 }
 698
 699 static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
 700 {
 701         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 702         struct net_device *real_dev = vlan->real_dev;
 703         struct netpoll *netpoll;
 704         int err = 0;
 705
 706         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 707         err = -ENOMEM;
 708         if (!netpoll)
 709                 goto out;
 710
 711         err = __netpoll_setup(netpoll, real_dev);
 712         if (err) {
 713                 kfree(netpoll);
 714                 goto out;
 715         }
 716
 717         vlan->netpoll = netpoll;
 718
 719 out:
 720         return err;
 721 }
 722
 723 static void vlan_dev_netpoll_cleanup(struct net_device *dev)
 724 {
 725         struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
 726         struct netpoll *netpoll = vlan->netpoll;
 727
 728         if (!netpoll)
 729                 return;
 730
 731         vlan->netpoll = NULL;
 732
 733         __netpoll_free_async(netpoll);
 734 }
 735 #endif /* CONFIG_NET_POLL_CONTROLLER */
 736
 737 static int vlan_dev_get_iflink(const struct net_device *dev)
 738 {
 739         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 740
 741         return real_dev->ifindex;
 742 }
 743
 744 static const struct ethtool_ops vlan_ethtool_ops = {
 745         .get_link_ksettings     = vlan_ethtool_get_link_ksettings,
 746         .get_drvinfo            = vlan_ethtool_get_drvinfo,
 747         .get_link               = ethtool_op_get_link,
 748         .get_ts_info            = vlan_ethtool_get_ts_info,
 749 };
 750
 751 static const struct net_device_ops vlan_netdev_ops = {
 752         .ndo_change_mtu         = vlan_dev_change_mtu,
 753         .ndo_init               = vlan_dev_init,
 754         .ndo_uninit             = vlan_dev_uninit,
 755         .ndo_open               = vlan_dev_open,
 756         .ndo_stop               = vlan_dev_stop,
 757         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
 758         .ndo_validate_addr      = eth_validate_addr,
 759         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 760         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 761         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 762         .ndo_do_ioctl           = vlan_dev_ioctl,
 763         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 764         .ndo_get_stats64        = vlan_dev_get_stats64,
 765 #if IS_ENABLED(CONFIG_FCOE)
 766         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 767         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 768         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 769         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 770         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 771         .ndo_fcoe_ddp_target    = vlan_dev_fcoe_ddp_target,
 772 #endif
 773 #ifdef CONFIG_NET_POLL_CONTROLLER
 774         .ndo_poll_controller    = vlan_dev_poll_controller,
 775         .ndo_netpoll_setup      = vlan_dev_netpoll_setup,
 776         .ndo_netpoll_cleanup    = vlan_dev_netpoll_cleanup,
 777 #endif
 778         .ndo_fix_features       = vlan_dev_fix_features,
 779         .ndo_fdb_add            = switchdev_port_fdb_add,
 780         .ndo_fdb_del            = switchdev_port_fdb_del,
 781         .ndo_fdb_dump           = switchdev_port_fdb_dump,
 782         .ndo_bridge_setlink     = switchdev_port_bridge_setlink,
 783         .ndo_bridge_getlink     = switchdev_port_bridge_getlink,
 784         .ndo_bridge_dellink     = switchdev_port_bridge_dellink,
 785         .ndo_get_lock_subclass  = vlan_dev_get_lock_subclass,
 786         .ndo_get_iflink         = vlan_dev_get_iflink,
 787 };
 788
 789 static void vlan_dev_free(struct net_device *dev)
 790 {
 791         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 792
 793         free_percpu(vlan->vlan_pcpu_stats);
 794         vlan->vlan_pcpu_stats = NULL;
 795         free_netdev(dev);
 796 }
 797
 798 void vlan_setup(struct net_device *dev)
 799 {
 800         ether_setup(dev);
 801
 802         dev->priv_flags         |= IFF_802_1Q_VLAN | IFF_NO_QUEUE;
 803         dev->priv_flags         |= IFF_UNICAST_FLT;
 804         dev->priv_flags         &= ~IFF_TX_SKB_SHARING;
 805         netif_keep_dst(dev);
 806
 807         dev->netdev_ops         = &vlan_netdev_ops;
 808         dev->destructor         = vlan_dev_free;
 809         dev->ethtool_ops        = &vlan_ethtool_ops;
 810
 811         eth_zero_addr(dev->broadcast);
 812 }