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 <linux/phy.h>
  33 #include <net/arp.h>
  34 #include <net/switchdev.h>
  35
  36 #include "vlan.h"
  37 #include "vlanproc.h"
  38 #include <linux/if_vlan.h>
  39 #include <linux/netpoll.h>
  40
  41 /*
  42  *      Create the VLAN header for an arbitrary protocol layer
  43  *
  44  *      saddr=NULL      means use device source address
  45  *      daddr=NULL      means leave destination address (eg unresolved arp)
  46  *
  47  *  This is called when the SKB is moving down the stack towards the
  48  *  physical devices.
  49  */
  50 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
  51                                 unsigned short type,
  52                                 const void *daddr, const void *saddr,
  53                                 unsigned int len)
  54 {
  55         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
  56         struct vlan_hdr *vhdr;
  57         unsigned int vhdrlen = 0;
  58         u16 vlan_tci = 0;
  59         int rc;
  60
  61         if (!(vlan->flags & VLAN_FLAG_REORDER_HDR)) {
  62                 vhdr = skb_push(skb, VLAN_HLEN);
  63
  64                 vlan_tci = vlan->vlan_id;
  65                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
  66                 vhdr->h_vlan_TCI = htons(vlan_tci);
  67
  68                 /*
  69                  *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
  70                  *  put the length in here instead.
  71                  */
  72                 if (type != ETH_P_802_3 && type != ETH_P_802_2)
  73                         vhdr->h_vlan_encapsulated_proto = htons(type);
  74                 else
  75                         vhdr->h_vlan_encapsulated_proto = htons(len);
  76
  77                 skb->protocol = vlan->vlan_proto;
  78                 type = ntohs(vlan->vlan_proto);
  79                 vhdrlen = VLAN_HLEN;
  80         }
  81
  82         /* Before delegating work to the lower layer, enter our MAC-address */
  83         if (saddr == NULL)
  84                 saddr = dev->dev_addr;
  85
  86         /* Now make the underlying real hard header */
  87         dev = vlan->real_dev;
  88         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
  89         if (rc > 0)
  90                 rc += vhdrlen;
  91         return rc;
  92 }
  93
  94 static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb)
  95 {
  96 #ifdef CONFIG_NET_POLL_CONTROLLER
  97         if (vlan->netpoll)
  98                 netpoll_send_skb(vlan->netpoll, skb);
  99 #else
 100         BUG();
 101 #endif
 102         return NETDEV_TX_OK;
 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 (veth->h_vlan_proto != vlan->vlan_proto ||
 119             vlan->flags & VLAN_FLAG_REORDER_HDR) {
 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                 stats->tx_packets++;
 139                 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         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 *mp = NULL;
 181         struct vlan_priority_tci_mapping *np;
 182         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
 183
 184         /* See if a priority mapping exists.. */
 185         mp = vlan->egress_priority_map[skb_prio & 0xF];
 186         while (mp) {
 187                 if (mp->priority == skb_prio) {
 188                         if (mp->vlan_qos && !vlan_qos)
 189                                 vlan->nr_egress_mappings--;
 190                         else if (!mp->vlan_qos && vlan_qos)
 191                                 vlan->nr_egress_mappings++;
 192                         mp->vlan_qos = vlan_qos;
 193                         return 0;
 194                 }
 195                 mp = mp->next;
 196         }
 197
 198         /* Create a new mapping then. */
 199         mp = vlan->egress_priority_map[skb_prio & 0xF];
 200         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 201         if (!np)
 202                 return -ENOBUFS;
 203
 204         np->next = mp;
 205         np->priority = skb_prio;
 206         np->vlan_qos = vlan_qos;
 207         /* Before inserting this element in hash table, make sure all its fields
 208          * are committed to memory.
 209          * coupled with smp_rmb() in vlan_dev_get_egress_qos_mask()
 210          */
 211         smp_wmb();
 212         vlan->egress_priority_map[skb_prio & 0xF] = np;
 213         if (vlan_qos)
 214                 vlan->nr_egress_mappings++;
 215         return 0;
 216 }
 217
 218 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
 219 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 220 {
 221         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 222         u32 old_flags = vlan->flags;
 223
 224         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
 225                      VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
 226                 return -EINVAL;
 227
 228         vlan->flags = (old_flags & ~mask) | (flags & mask);
 229
 230         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
 231                 if (vlan->flags & VLAN_FLAG_GVRP)
 232                         vlan_gvrp_request_join(dev);
 233                 else
 234                         vlan_gvrp_request_leave(dev);
 235         }
 236
 237         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) {
 238                 if (vlan->flags & VLAN_FLAG_MVRP)
 239                         vlan_mvrp_request_join(dev);
 240                 else
 241                         vlan_mvrp_request_leave(dev);
 242         }
 243         return 0;
 244 }
 245
 246 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
 247 {
 248         strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23);
 249 }
 250
 251 bool vlan_dev_inherit_address(struct net_device *dev,
 252                               struct net_device *real_dev)
 253 {
 254         if (dev->addr_assign_type != NET_ADDR_STOLEN)
 255                 return false;
 256
 257         ether_addr_copy(dev->dev_addr, real_dev->dev_addr);
 258         call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
 259         return true;
 260 }
 261
 262 static int vlan_dev_open(struct net_device *dev)
 263 {
 264         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 265         struct net_device *real_dev = vlan->real_dev;
 266         int err;
 267
 268         if (!(real_dev->flags & IFF_UP) &&
 269             !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 270                 return -ENETDOWN;
 271
 272         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr) &&
 273             !vlan_dev_inherit_address(dev, real_dev)) {
 274                 err = dev_uc_add(real_dev, dev->dev_addr);
 275                 if (err < 0)
 276                         goto out;
 277         }
 278
 279         if (dev->flags & IFF_ALLMULTI) {
 280                 err = dev_set_allmulti(real_dev, 1);
 281                 if (err < 0)
 282                         goto del_unicast;
 283         }
 284         if (dev->flags & IFF_PROMISC) {
 285                 err = dev_set_promiscuity(real_dev, 1);
 286                 if (err < 0)
 287                         goto clear_allmulti;
 288         }
 289
 290         ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr);
 291
 292         if (vlan->flags & VLAN_FLAG_GVRP)
 293                 vlan_gvrp_request_join(dev);
 294
 295         if (vlan->flags & VLAN_FLAG_MVRP)
 296                 vlan_mvrp_request_join(dev);
 297
 298         if (netif_carrier_ok(real_dev))
 299                 netif_carrier_on(dev);
 300         return 0;
 301
 302 clear_allmulti:
 303         if (dev->flags & IFF_ALLMULTI)
 304                 dev_set_allmulti(real_dev, -1);
 305 del_unicast:
 306         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 307                 dev_uc_del(real_dev, dev->dev_addr);
 308 out:
 309         netif_carrier_off(dev);
 310         return err;
 311 }
 312
 313 static int vlan_dev_stop(struct net_device *dev)
 314 {
 315         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 316         struct net_device *real_dev = vlan->real_dev;
 317
 318         dev_mc_unsync(real_dev, dev);
 319         dev_uc_unsync(real_dev, dev);
 320         if (dev->flags & IFF_ALLMULTI)
 321                 dev_set_allmulti(real_dev, -1);
 322         if (dev->flags & IFF_PROMISC)
 323                 dev_set_promiscuity(real_dev, -1);
 324
 325         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 326                 dev_uc_del(real_dev, dev->dev_addr);
 327
 328         netif_carrier_off(dev);
 329         return 0;
 330 }
 331
 332 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 333 {
 334         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 335         struct sockaddr *addr = p;
 336         int err;
 337
 338         if (!is_valid_ether_addr(addr->sa_data))
 339                 return -EADDRNOTAVAIL;
 340
 341         if (!(dev->flags & IFF_UP))
 342                 goto out;
 343
 344         if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) {
 345                 err = dev_uc_add(real_dev, addr->sa_data);
 346                 if (err < 0)
 347                         return err;
 348         }
 349
 350         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 351                 dev_uc_del(real_dev, dev->dev_addr);
 352
 353 out:
 354         ether_addr_copy(dev->dev_addr, addr->sa_data);
 355         return 0;
 356 }
 357
 358 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 359 {
 360         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 361         const struct net_device_ops *ops = real_dev->netdev_ops;
 362         struct ifreq ifrr;
 363         int err = -EOPNOTSUPP;
 364
 365         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 366         ifrr.ifr_ifru = ifr->ifr_ifru;
 367
 368         switch (cmd) {
 369         case SIOCGMIIPHY:
 370         case SIOCGMIIREG:
 371         case SIOCSMIIREG:
 372         case SIOCSHWTSTAMP:
 373         case SIOCGHWTSTAMP:
 374                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
 375                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
 376                 break;
 377         }
 378
 379         if (!err)
 380                 ifr->ifr_ifru = ifrr.ifr_ifru;
 381
 382         return err;
 383 }
 384
 385 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
 386 {
 387         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 388         const struct net_device_ops *ops = real_dev->netdev_ops;
 389         int err = 0;
 390
 391         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
 392                 err = ops->ndo_neigh_setup(real_dev, pa);
 393
 394         return err;
 395 }
 396
 397 #if IS_ENABLED(CONFIG_FCOE)
 398 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
 399                                    struct scatterlist *sgl, unsigned int sgc)
 400 {
 401         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 402         const struct net_device_ops *ops = real_dev->netdev_ops;
 403         int rc = 0;
 404
 405         if (ops->ndo_fcoe_ddp_setup)
 406                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
 407
 408         return rc;
 409 }
 410
 411 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
 412 {
 413         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 414         const struct net_device_ops *ops = real_dev->netdev_ops;
 415         int len = 0;
 416
 417         if (ops->ndo_fcoe_ddp_done)
 418                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
 419
 420         return len;
 421 }
 422
 423 static int vlan_dev_fcoe_enable(struct net_device *dev)
 424 {
 425         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 426         const struct net_device_ops *ops = real_dev->netdev_ops;
 427         int rc = -EINVAL;
 428
 429         if (ops->ndo_fcoe_enable)
 430                 rc = ops->ndo_fcoe_enable(real_dev);
 431         return rc;
 432 }
 433
 434 static int vlan_dev_fcoe_disable(struct net_device *dev)
 435 {
 436         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 437         const struct net_device_ops *ops = real_dev->netdev_ops;
 438         int rc = -EINVAL;
 439
 440         if (ops->ndo_fcoe_disable)
 441                 rc = ops->ndo_fcoe_disable(real_dev);
 442         return rc;
 443 }
 444
 445 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
 446 {
 447         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 448         const struct net_device_ops *ops = real_dev->netdev_ops;
 449         int rc = -EINVAL;
 450
 451         if (ops->ndo_fcoe_get_wwn)
 452                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
 453         return rc;
 454 }
 455
 456 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
 457                                     struct scatterlist *sgl, unsigned int sgc)
 458 {
 459         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 460         const struct net_device_ops *ops = real_dev->netdev_ops;
 461         int rc = 0;
 462
 463         if (ops->ndo_fcoe_ddp_target)
 464                 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
 465
 466         return rc;
 467 }
 468 #endif
 469
 470 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 471 {
 472         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 473
 474         if (dev->flags & IFF_UP) {
 475                 if (change & IFF_ALLMULTI)
 476                         dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 477                 if (change & IFF_PROMISC)
 478                         dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 479         }
 480 }
 481
 482 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 483 {
 484         dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 485         dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 486 }
 487
 488 /*
 489  * vlan network devices have devices nesting below it, and are a special
 490  * "super class" of normal network devices; split their locks off into a
 491  * separate class since they always nest.
 492  */
 493 static struct lock_class_key vlan_netdev_xmit_lock_key;
 494 static struct lock_class_key vlan_netdev_addr_lock_key;
 495
 496 static void vlan_dev_set_lockdep_one(struct net_device *dev,
 497                                      struct netdev_queue *txq,
 498                                      void *_subclass)
 499 {
 500         lockdep_set_class_and_subclass(&txq->_xmit_lock,
 501                                        &vlan_netdev_xmit_lock_key,
 502                                        *(int *)_subclass);
 503 }
 504
 505 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
 506 {
 507         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 508                                        &vlan_netdev_addr_lock_key,
 509                                        subclass);
 510         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
 511 }
 512
 513 static int vlan_dev_get_lock_subclass(struct net_device *dev)
 514 {
 515         return vlan_dev_priv(dev)->nest_level;
 516 }
 517
 518 static const struct header_ops vlan_header_ops = {
 519         .create  = vlan_dev_hard_header,
 520         .parse   = eth_header_parse,
 521 };
 522
 523 static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
 524                                      unsigned short type,
 525                                      const void *daddr, const void *saddr,
 526                                      unsigned int len)
 527 {
 528         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 529         struct net_device *real_dev = vlan->real_dev;
 530
 531         if (saddr == NULL)
 532                 saddr = dev->dev_addr;
 533
 534         return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
 535 }
 536
 537 static const struct header_ops vlan_passthru_header_ops = {
 538         .create  = vlan_passthru_hard_header,
 539         .parse   = eth_header_parse,
 540 };
 541
 542 static struct device_type vlan_type = {
 543         .name   = "vlan",
 544 };
 545
 546 static const struct net_device_ops vlan_netdev_ops;
 547
 548 static int vlan_dev_init(struct net_device *dev)
 549 {
 550         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 551
 552         netif_carrier_off(dev);
 553
 554         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 555         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
 556                                           IFF_MASTER | IFF_SLAVE);
 557         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 558                                           (1<<__LINK_STATE_DORMANT))) |
 559                       (1<<__LINK_STATE_PRESENT);
 560
 561         dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG |
 562                            NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
 563                            NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC |
 564                            NETIF_F_ALL_FCOE;
 565
 566         dev->features |= dev->hw_features | NETIF_F_LLTX;
 567         dev->gso_max_size = real_dev->gso_max_size;
 568         dev->gso_max_segs = real_dev->gso_max_segs;
 569         if (dev->features & NETIF_F_VLAN_FEATURES)
 570                 netdev_warn(real_dev, "VLAN features are set incorrectly.  Q-in-Q configurations may not work correctly.\n");
 571
 572         dev->vlan_features = real_dev->vlan_features & ~NETIF_F_ALL_FCOE;
 573
 574         /* ipv6 shared card related stuff */
 575         dev->dev_id = real_dev->dev_id;
 576
 577         if (is_zero_ether_addr(dev->dev_addr)) {
 578                 ether_addr_copy(dev->dev_addr, real_dev->dev_addr);
 579                 dev->addr_assign_type = NET_ADDR_STOLEN;
 580         }
 581         if (is_zero_ether_addr(dev->broadcast))
 582                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 583
 584 #if IS_ENABLED(CONFIG_FCOE)
 585         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
 586 #endif
 587
 588         dev->needed_headroom = real_dev->needed_headroom;
 589         if (vlan_hw_offload_capable(real_dev->features,
 590                                     vlan_dev_priv(dev)->vlan_proto)) {
 591                 dev->header_ops      = &vlan_passthru_header_ops;
 592                 dev->hard_header_len = real_dev->hard_header_len;
 593         } else {
 594                 dev->header_ops      = &vlan_header_ops;
 595                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 596         }
 597
 598         dev->netdev_ops = &vlan_netdev_ops;
 599
 600         SET_NETDEV_DEVTYPE(dev, &vlan_type);
 601
 602         vlan_dev_set_lockdep_class(dev, vlan_dev_get_lock_subclass(dev));
 603
 604         vlan_dev_priv(dev)->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 605         if (!vlan_dev_priv(dev)->vlan_pcpu_stats)
 606                 return -ENOMEM;
 607
 608         return 0;
 609 }
 610
 611 static void vlan_dev_uninit(struct net_device *dev)
 612 {
 613         struct vlan_priority_tci_mapping *pm;
 614         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 615         int i;
 616
 617         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 618                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 619                         vlan->egress_priority_map[i] = pm->next;
 620                         kfree(pm);
 621                 }
 622         }
 623 }
 624
 625 static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
 626         netdev_features_t features)
 627 {
 628         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 629         netdev_features_t old_features = features;
 630         netdev_features_t lower_features;
 631
 632         lower_features = netdev_intersect_features((real_dev->vlan_features |
 633                                                     NETIF_F_RXCSUM),
 634                                                    real_dev->features);
 635
 636         /* Add HW_CSUM setting to preserve user ability to control
 637          * checksum offload on the vlan device.
 638          */
 639         if (lower_features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
 640                 lower_features |= NETIF_F_HW_CSUM;
 641         features = netdev_intersect_features(features, lower_features);
 642         features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE);
 643         features |= NETIF_F_LLTX;
 644
 645         return features;
 646 }
 647
 648 static int vlan_ethtool_get_link_ksettings(struct net_device *dev,
 649                                            struct ethtool_link_ksettings *cmd)
 650 {
 651         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 652
 653         return __ethtool_get_link_ksettings(vlan->real_dev, cmd);
 654 }
 655
 656 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
 657                                      struct ethtool_drvinfo *info)
 658 {
 659         strlcpy(info->driver, vlan_fullname, sizeof(info->driver));
 660         strlcpy(info->version, vlan_version, sizeof(info->version));
 661         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
 662 }
 663
 664 static int vlan_ethtool_get_ts_info(struct net_device *dev,
 665                                     struct ethtool_ts_info *info)
 666 {
 667         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 668         const struct ethtool_ops *ops = vlan->real_dev->ethtool_ops;
 669         struct phy_device *phydev = vlan->real_dev->phydev;
 670
 671         if (phydev && phydev->drv && phydev->drv->ts_info) {
 672                  return phydev->drv->ts_info(phydev, info);
 673         } else if (ops->get_ts_info) {
 674                 return ops->get_ts_info(vlan->real_dev, info);
 675         } else {
 676                 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
 677                         SOF_TIMESTAMPING_SOFTWARE;
 678                 info->phc_index = -1;
 679         }
 680
 681         return 0;
 682 }
 683
 684 static void vlan_dev_get_stats64(struct net_device *dev,
 685                                  struct rtnl_link_stats64 *stats)
 686 {
 687         struct vlan_pcpu_stats *p;
 688         u32 rx_errors = 0, tx_dropped = 0;
 689         int i;
 690
 691         for_each_possible_cpu(i) {
 692                 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
 693                 unsigned int start;
 694
 695                 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
 696                 do {
 697                         start = u64_stats_fetch_begin_irq(&p->syncp);
 698                         rxpackets       = p->rx_packets;
 699                         rxbytes         = p->rx_bytes;
 700                         rxmulticast     = p->rx_multicast;
 701                         txpackets       = p->tx_packets;
 702                         txbytes         = p->tx_bytes;
 703                 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
 704
 705                 stats->rx_packets       += rxpackets;
 706                 stats->rx_bytes         += rxbytes;
 707                 stats->multicast        += rxmulticast;
 708                 stats->tx_packets       += txpackets;
 709                 stats->tx_bytes         += txbytes;
 710                 /* rx_errors & tx_dropped are u32 */
 711                 rx_errors       += p->rx_errors;
 712                 tx_dropped      += p->tx_dropped;
 713         }
 714         stats->rx_errors  = rx_errors;
 715         stats->tx_dropped = tx_dropped;
 716 }
 717
 718 #ifdef CONFIG_NET_POLL_CONTROLLER
 719 static void vlan_dev_poll_controller(struct net_device *dev)
 720 {
 721         return;
 722 }
 723
 724 static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
 725 {
 726         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 727         struct net_device *real_dev = vlan->real_dev;
 728         struct netpoll *netpoll;
 729         int err = 0;
 730
 731         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 732         err = -ENOMEM;
 733         if (!netpoll)
 734                 goto out;
 735
 736         err = __netpoll_setup(netpoll, real_dev);
 737         if (err) {
 738                 kfree(netpoll);
 739                 goto out;
 740         }
 741
 742         vlan->netpoll = netpoll;
 743
 744 out:
 745         return err;
 746 }
 747
 748 static void vlan_dev_netpoll_cleanup(struct net_device *dev)
 749 {
 750         struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
 751         struct netpoll *netpoll = vlan->netpoll;
 752
 753         if (!netpoll)
 754                 return;
 755
 756         vlan->netpoll = NULL;
 757
 758         __netpoll_free_async(netpoll);
 759 }
 760 #endif /* CONFIG_NET_POLL_CONTROLLER */
 761
 762 static int vlan_dev_get_iflink(const struct net_device *dev)
 763 {
 764         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 765
 766         return real_dev->ifindex;
 767 }
 768
 769 static const struct ethtool_ops vlan_ethtool_ops = {
 770         .get_link_ksettings     = vlan_ethtool_get_link_ksettings,
 771         .get_drvinfo            = vlan_ethtool_get_drvinfo,
 772         .get_link               = ethtool_op_get_link,
 773         .get_ts_info            = vlan_ethtool_get_ts_info,
 774 };
 775
 776 static const struct net_device_ops vlan_netdev_ops = {
 777         .ndo_change_mtu         = vlan_dev_change_mtu,
 778         .ndo_init               = vlan_dev_init,
 779         .ndo_uninit             = vlan_dev_uninit,
 780         .ndo_open               = vlan_dev_open,
 781         .ndo_stop               = vlan_dev_stop,
 782         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
 783         .ndo_validate_addr      = eth_validate_addr,
 784         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 785         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 786         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 787         .ndo_do_ioctl           = vlan_dev_ioctl,
 788         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 789         .ndo_get_stats64        = vlan_dev_get_stats64,
 790 #if IS_ENABLED(CONFIG_FCOE)
 791         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 792         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 793         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 794         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 795         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 796         .ndo_fcoe_ddp_target    = vlan_dev_fcoe_ddp_target,
 797 #endif
 798 #ifdef CONFIG_NET_POLL_CONTROLLER
 799         .ndo_poll_controller    = vlan_dev_poll_controller,
 800         .ndo_netpoll_setup      = vlan_dev_netpoll_setup,
 801         .ndo_netpoll_cleanup    = vlan_dev_netpoll_cleanup,
 802 #endif
 803         .ndo_fix_features       = vlan_dev_fix_features,
 804         .ndo_get_lock_subclass  = vlan_dev_get_lock_subclass,
 805         .ndo_get_iflink         = vlan_dev_get_iflink,
 806 };
 807
 808 static void vlan_dev_free(struct net_device *dev)
 809 {
 810         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 811
 812         free_percpu(vlan->vlan_pcpu_stats);
 813         vlan->vlan_pcpu_stats = NULL;
 814 }
 815
 816 void vlan_setup(struct net_device *dev)
 817 {
 818         ether_setup(dev);
 819
 820         dev->priv_flags         |= IFF_802_1Q_VLAN | IFF_NO_QUEUE;
 821         dev->priv_flags         |= IFF_UNICAST_FLT;
 822         dev->priv_flags         &= ~IFF_TX_SKB_SHARING;
 823         netif_keep_dst(dev);
 824
 825         dev->netdev_ops         = &vlan_netdev_ops;
 826         dev->needs_free_netdev  = true;
 827         dev->priv_destructor    = vlan_dev_free;
 828         dev->ethtool_ops        = &vlan_ethtool_ops;
 829
 830         dev->min_mtu            = 0;
 831         dev->max_mtu            = ETH_MAX_MTU;
 832
 833         eth_zero_addr(dev->broadcast);
 834 }