net/8021q/vlan_dev.c

   1 /* -*- linux-c -*-
   2  * INET         802.1Q VLAN
   3  *              Ethernet-type device handling.
   4  *
   5  * Authors:     Ben Greear <[email protected]>
   6  *              Please send support related email to: [email protected]
   7  *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
   8  *
   9  * Fixes:       Mar 22 2001: Martin Bokaemper <[email protected]>
  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
  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 = 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         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 150         unsigned int max_mtu = real_dev->mtu;
 151
 152         if (netif_reduces_vlan_mtu(real_dev))
 153                 max_mtu -= VLAN_HLEN;
 154         if (max_mtu < new_mtu)
 155                 return -ERANGE;
 156
 157         dev->mtu = new_mtu;
 158
 159         return 0;
 160 }
 161
 162 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 163                                    u32 skb_prio, u16 vlan_prio)
 164 {
 165         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 166
 167         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
 168                 vlan->nr_ingress_mappings--;
 169         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
 170                 vlan->nr_ingress_mappings++;
 171
 172         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 173 }
 174
 175 int vlan_dev_set_egress_priority(const struct net_device *dev,
 176                                  u32 skb_prio, u16 vlan_prio)
 177 {
 178         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 179         struct vlan_priority_tci_mapping *mp = NULL;
 180         struct vlan_priority_tci_mapping *np;
 181         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
 182
 183         /* See if a priority mapping exists.. */
 184         mp = vlan->egress_priority_map[skb_prio & 0xF];
 185         while (mp) {
 186                 if (mp->priority == skb_prio) {
 187                         if (mp->vlan_qos && !vlan_qos)
 188                                 vlan->nr_egress_mappings--;
 189                         else if (!mp->vlan_qos && vlan_qos)
 190                                 vlan->nr_egress_mappings++;
 191                         mp->vlan_qos = vlan_qos;
 192                         return 0;
 193                 }
 194                 mp = mp->next;
 195         }
 196
 197         /* Create a new mapping then. */
 198         mp = vlan->egress_priority_map[skb_prio & 0xF];
 199         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 200         if (!np)
 201                 return -ENOBUFS;
 202
 203         np->next = mp;
 204         np->priority = skb_prio;
 205         np->vlan_qos = vlan_qos;
 206         /* Before inserting this element in hash table, make sure all its fields
 207          * are committed to memory.
 208          * coupled with smp_rmb() in vlan_dev_get_egress_qos_mask()
 209          */
 210         smp_wmb();
 211         vlan->egress_priority_map[skb_prio & 0xF] = np;
 212         if (vlan_qos)
 213                 vlan->nr_egress_mappings++;
 214         return 0;
 215 }
 216
 217 /* Flags are defined in the vlan_flags enum in
 218  * include/uapi/linux/if_vlan.h file.
 219  */
 220 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 221 {
 222         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 223         u32 old_flags = vlan->flags;
 224
 225         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
 226                      VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
 227                 return -EINVAL;
 228
 229         vlan->flags = (old_flags & ~mask) | (flags & mask);
 230
 231         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
 232                 if (vlan->flags & VLAN_FLAG_GVRP)
 233                         vlan_gvrp_request_join(dev);
 234                 else
 235                         vlan_gvrp_request_leave(dev);
 236         }
 237
 238         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) {
 239                 if (vlan->flags & VLAN_FLAG_MVRP)
 240                         vlan_mvrp_request_join(dev);
 241                 else
 242                         vlan_mvrp_request_leave(dev);
 243         }
 244         return 0;
 245 }
 246
 247 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
 248 {
 249         strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23);
 250 }
 251
 252 bool vlan_dev_inherit_address(struct net_device *dev,
 253                               struct net_device *real_dev)
 254 {
 255         if (dev->addr_assign_type != NET_ADDR_STOLEN)
 256                 return false;
 257
 258         ether_addr_copy(dev->dev_addr, real_dev->dev_addr);
 259         call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
 260         return true;
 261 }
 262
 263 static int vlan_dev_open(struct net_device *dev)
 264 {
 265         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 266         struct net_device *real_dev = vlan->real_dev;
 267         int err;
 268
 269         if (!(real_dev->flags & IFF_UP) &&
 270             !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 271                 return -ENETDOWN;
 272
 273         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr) &&
 274             !vlan_dev_inherit_address(dev, real_dev)) {
 275                 err = dev_uc_add(real_dev, dev->dev_addr);
 276                 if (err < 0)
 277                         goto out;
 278         }
 279
 280         if (dev->flags & IFF_ALLMULTI) {
 281                 err = dev_set_allmulti(real_dev, 1);
 282                 if (err < 0)
 283                         goto del_unicast;
 284         }
 285         if (dev->flags & IFF_PROMISC) {
 286                 err = dev_set_promiscuity(real_dev, 1);
 287                 if (err < 0)
 288                         goto clear_allmulti;
 289         }
 290
 291         ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr);
 292
 293         if (vlan->flags & VLAN_FLAG_GVRP)
 294                 vlan_gvrp_request_join(dev);
 295
 296         if (vlan->flags & VLAN_FLAG_MVRP)
 297                 vlan_mvrp_request_join(dev);
 298
 299         if (netif_carrier_ok(real_dev))
 300                 netif_carrier_on(dev);
 301         return 0;
 302
 303 clear_allmulti:
 304         if (dev->flags & IFF_ALLMULTI)
 305                 dev_set_allmulti(real_dev, -1);
 306 del_unicast:
 307         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 308                 dev_uc_del(real_dev, dev->dev_addr);
 309 out:
 310         netif_carrier_off(dev);
 311         return err;
 312 }
 313
 314 static int vlan_dev_stop(struct net_device *dev)
 315 {
 316         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 317         struct net_device *real_dev = vlan->real_dev;
 318
 319         dev_mc_unsync(real_dev, dev);
 320         dev_uc_unsync(real_dev, dev);
 321         if (dev->flags & IFF_ALLMULTI)
 322                 dev_set_allmulti(real_dev, -1);
 323         if (dev->flags & IFF_PROMISC)
 324                 dev_set_promiscuity(real_dev, -1);
 325
 326         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 327                 dev_uc_del(real_dev, dev->dev_addr);
 328
 329         netif_carrier_off(dev);
 330         return 0;
 331 }
 332
 333 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 334 {
 335         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 336         struct sockaddr *addr = p;
 337         int err;
 338
 339         if (!is_valid_ether_addr(addr->sa_data))
 340                 return -EADDRNOTAVAIL;
 341
 342         if (!(dev->flags & IFF_UP))
 343                 goto out;
 344
 345         if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) {
 346                 err = dev_uc_add(real_dev, addr->sa_data);
 347                 if (err < 0)
 348                         return err;
 349         }
 350
 351         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 352                 dev_uc_del(real_dev, dev->dev_addr);
 353
 354 out:
 355         ether_addr_copy(dev->dev_addr, addr->sa_data);
 356         return 0;
 357 }
 358
 359 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 360 {
 361         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 362         const struct net_device_ops *ops = real_dev->netdev_ops;
 363         struct ifreq ifrr;
 364         int err = -EOPNOTSUPP;
 365
 366         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 367         ifrr.ifr_ifru = ifr->ifr_ifru;
 368
 369         switch (cmd) {
 370         case SIOCGMIIPHY:
 371         case SIOCGMIIREG:
 372         case SIOCSMIIREG:
 373         case SIOCSHWTSTAMP:
 374         case SIOCGHWTSTAMP:
 375                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
 376                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
 377                 break;
 378         }
 379
 380         if (!err)
 381                 ifr->ifr_ifru = ifrr.ifr_ifru;
 382
 383         return err;
 384 }
 385
 386 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
 387 {
 388         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 389         const struct net_device_ops *ops = real_dev->netdev_ops;
 390         int err = 0;
 391
 392         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
 393                 err = ops->ndo_neigh_setup(real_dev, pa);
 394
 395         return err;
 396 }
 397
 398 #if IS_ENABLED(CONFIG_FCOE)
 399 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
 400                                    struct scatterlist *sgl, unsigned int sgc)
 401 {
 402         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 403         const struct net_device_ops *ops = real_dev->netdev_ops;
 404         int rc = 0;
 405
 406         if (ops->ndo_fcoe_ddp_setup)
 407                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
 408
 409         return rc;
 410 }
 411
 412 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
 413 {
 414         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 415         const struct net_device_ops *ops = real_dev->netdev_ops;
 416         int len = 0;
 417
 418         if (ops->ndo_fcoe_ddp_done)
 419                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
 420
 421         return len;
 422 }
 423
 424 static int vlan_dev_fcoe_enable(struct net_device *dev)
 425 {
 426         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 427         const struct net_device_ops *ops = real_dev->netdev_ops;
 428         int rc = -EINVAL;
 429
 430         if (ops->ndo_fcoe_enable)
 431                 rc = ops->ndo_fcoe_enable(real_dev);
 432         return rc;
 433 }
 434
 435 static int vlan_dev_fcoe_disable(struct net_device *dev)
 436 {
 437         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 438         const struct net_device_ops *ops = real_dev->netdev_ops;
 439         int rc = -EINVAL;
 440
 441         if (ops->ndo_fcoe_disable)
 442                 rc = ops->ndo_fcoe_disable(real_dev);
 443         return rc;
 444 }
 445
 446 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
 447 {
 448         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 449         const struct net_device_ops *ops = real_dev->netdev_ops;
 450         int rc = -EINVAL;
 451
 452         if (ops->ndo_fcoe_get_wwn)
 453                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
 454         return rc;
 455 }
 456
 457 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
 458                                     struct scatterlist *sgl, unsigned int sgc)
 459 {
 460         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 461         const struct net_device_ops *ops = real_dev->netdev_ops;
 462         int rc = 0;
 463
 464         if (ops->ndo_fcoe_ddp_target)
 465                 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
 466
 467         return rc;
 468 }
 469 #endif
 470
 471 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 472 {
 473         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 474
 475         if (dev->flags & IFF_UP) {
 476                 if (change & IFF_ALLMULTI)
 477                         dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 478                 if (change & IFF_PROMISC)
 479                         dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 480         }
 481 }
 482
 483 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 484 {
 485         dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 486         dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 487 }
 488
 489 /*
 490  * vlan network devices have devices nesting below it, and are a special
 491  * "super class" of normal network devices; split their locks off into a
 492  * separate class since they always nest.
 493  */
 494 static struct lock_class_key vlan_netdev_xmit_lock_key;
 495 static struct lock_class_key vlan_netdev_addr_lock_key;
 496
 497 static void vlan_dev_set_lockdep_one(struct net_device *dev,
 498                                      struct netdev_queue *txq,
 499                                      void *_subclass)
 500 {
 501         lockdep_set_class_and_subclass(&txq->_xmit_lock,
 502                                        &vlan_netdev_xmit_lock_key,
 503                                        *(int *)_subclass);
 504 }
 505
 506 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
 507 {
 508         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 509                                        &vlan_netdev_addr_lock_key,
 510                                        subclass);
 511         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
 512 }
 513
 514 static int vlan_dev_get_lock_subclass(struct net_device *dev)
 515 {
 516         return vlan_dev_priv(dev)->nest_level;
 517 }
 518
 519 static const struct header_ops vlan_header_ops = {
 520         .create  = vlan_dev_hard_header,
 521         .parse   = eth_header_parse,
 522 };
 523
 524 static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
 525                                      unsigned short type,
 526                                      const void *daddr, const void *saddr,
 527                                      unsigned int len)
 528 {
 529         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 530         struct net_device *real_dev = vlan->real_dev;
 531
 532         if (saddr == NULL)
 533                 saddr = dev->dev_addr;
 534
 535         return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
 536 }
 537
 538 static const struct header_ops vlan_passthru_header_ops = {
 539         .create  = vlan_passthru_hard_header,
 540         .parse   = eth_header_parse,
 541 };
 542
 543 static struct device_type vlan_type = {
 544         .name   = "vlan",
 545 };
 546
 547 static const struct net_device_ops vlan_netdev_ops;
 548
 549 static int vlan_dev_init(struct net_device *dev)
 550 {
 551         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 552
 553         netif_carrier_off(dev);
 554
 555         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 556         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
 557                                           IFF_MASTER | IFF_SLAVE);
 558         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 559                                           (1<<__LINK_STATE_DORMANT))) |
 560                       (1<<__LINK_STATE_PRESENT);
 561
 562         dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG |
 563                            NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
 564                            NETIF_F_GSO_ENCAP_ALL |
 565                            NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC |
 566                            NETIF_F_ALL_FCOE;
 567
 568         dev->features |= dev->hw_features | NETIF_F_LLTX;
 569         dev->gso_max_size = real_dev->gso_max_size;
 570         dev->gso_max_segs = real_dev->gso_max_segs;
 571         if (dev->features & NETIF_F_VLAN_FEATURES)
 572                 netdev_warn(real_dev, "VLAN features are set incorrectly.  Q-in-Q configurations may not work correctly.\n");
 573
 574         dev->vlan_features = real_dev->vlan_features & ~NETIF_F_ALL_FCOE;
 575         dev->hw_enc_features = vlan_tnl_features(real_dev);
 576
 577         /* ipv6 shared card related stuff */
 578         dev->dev_id = real_dev->dev_id;
 579
 580         if (is_zero_ether_addr(dev->dev_addr)) {
 581                 ether_addr_copy(dev->dev_addr, real_dev->dev_addr);
 582                 dev->addr_assign_type = NET_ADDR_STOLEN;
 583         }
 584         if (is_zero_ether_addr(dev->broadcast))
 585                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 586
 587 #if IS_ENABLED(CONFIG_FCOE)
 588         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
 589 #endif
 590
 591         dev->needed_headroom = real_dev->needed_headroom;
 592         if (vlan_hw_offload_capable(real_dev->features,
 593                                     vlan_dev_priv(dev)->vlan_proto)) {
 594                 dev->header_ops      = &vlan_passthru_header_ops;
 595                 dev->hard_header_len = real_dev->hard_header_len;
 596         } else {
 597                 dev->header_ops      = &vlan_header_ops;
 598                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 599         }
 600
 601         dev->netdev_ops = &vlan_netdev_ops;
 602
 603         SET_NETDEV_DEVTYPE(dev, &vlan_type);
 604
 605         vlan_dev_set_lockdep_class(dev, vlan_dev_get_lock_subclass(dev));
 606
 607         vlan_dev_priv(dev)->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 608         if (!vlan_dev_priv(dev)->vlan_pcpu_stats)
 609                 return -ENOMEM;
 610
 611         return 0;
 612 }
 613
 614 static void vlan_dev_uninit(struct net_device *dev)
 615 {
 616         struct vlan_priority_tci_mapping *pm;
 617         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 618         int i;
 619
 620         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 621                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 622                         vlan->egress_priority_map[i] = pm->next;
 623                         kfree(pm);
 624                 }
 625         }
 626 }
 627
 628 static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
 629         netdev_features_t features)
 630 {
 631         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 632         netdev_features_t old_features = features;
 633         netdev_features_t lower_features;
 634
 635         lower_features = netdev_intersect_features((real_dev->vlan_features |
 636                                                     NETIF_F_RXCSUM),
 637                                                    real_dev->features);
 638
 639         /* Add HW_CSUM setting to preserve user ability to control
 640          * checksum offload on the vlan device.
 641          */
 642         if (lower_features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
 643                 lower_features |= NETIF_F_HW_CSUM;
 644         features = netdev_intersect_features(features, lower_features);
 645         features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE);
 646         features |= NETIF_F_LLTX;
 647
 648         return features;
 649 }
 650
 651 static int vlan_ethtool_get_link_ksettings(struct net_device *dev,
 652                                            struct ethtool_link_ksettings *cmd)
 653 {
 654         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 655
 656         return __ethtool_get_link_ksettings(vlan->real_dev, cmd);
 657 }
 658
 659 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
 660                                      struct ethtool_drvinfo *info)
 661 {
 662         strlcpy(info->driver, vlan_fullname, sizeof(info->driver));
 663         strlcpy(info->version, vlan_version, sizeof(info->version));
 664         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
 665 }
 666
 667 static int vlan_ethtool_get_ts_info(struct net_device *dev,
 668                                     struct ethtool_ts_info *info)
 669 {
 670         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 671         const struct ethtool_ops *ops = vlan->real_dev->ethtool_ops;
 672         struct phy_device *phydev = vlan->real_dev->phydev;
 673
 674         if (phydev && phydev->drv && phydev->drv->ts_info) {
 675                  return phydev->drv->ts_info(phydev, info);
 676         } else if (ops->get_ts_info) {
 677                 return ops->get_ts_info(vlan->real_dev, info);
 678         } else {
 679                 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
 680                         SOF_TIMESTAMPING_SOFTWARE;
 681                 info->phc_index = -1;
 682         }
 683
 684         return 0;
 685 }
 686
 687 static void vlan_dev_get_stats64(struct net_device *dev,
 688                                  struct rtnl_link_stats64 *stats)
 689 {
 690         struct vlan_pcpu_stats *p;
 691         u32 rx_errors = 0, tx_dropped = 0;
 692         int i;
 693
 694         for_each_possible_cpu(i) {
 695                 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
 696                 unsigned int start;
 697
 698                 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
 699                 do {
 700                         start = u64_stats_fetch_begin_irq(&p->syncp);
 701                         rxpackets       = p->rx_packets;
 702                         rxbytes         = p->rx_bytes;
 703                         rxmulticast     = p->rx_multicast;
 704                         txpackets       = p->tx_packets;
 705                         txbytes         = p->tx_bytes;
 706                 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
 707
 708                 stats->rx_packets       += rxpackets;
 709                 stats->rx_bytes         += rxbytes;
 710                 stats->multicast        += rxmulticast;
 711                 stats->tx_packets       += txpackets;
 712                 stats->tx_bytes         += txbytes;
 713                 /* rx_errors & tx_dropped are u32 */
 714                 rx_errors       += p->rx_errors;
 715                 tx_dropped      += p->tx_dropped;
 716         }
 717         stats->rx_errors  = rx_errors;
 718         stats->tx_dropped = tx_dropped;
 719 }
 720
 721 #ifdef CONFIG_NET_POLL_CONTROLLER
 722 static void vlan_dev_poll_controller(struct net_device *dev)
 723 {
 724         return;
 725 }
 726
 727 static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
 728 {
 729         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 730         struct net_device *real_dev = vlan->real_dev;
 731         struct netpoll *netpoll;
 732         int err = 0;
 733
 734         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 735         err = -ENOMEM;
 736         if (!netpoll)
 737                 goto out;
 738
 739         err = __netpoll_setup(netpoll, real_dev);
 740         if (err) {
 741                 kfree(netpoll);
 742                 goto out;
 743         }
 744
 745         vlan->netpoll = netpoll;
 746
 747 out:
 748         return err;
 749 }
 750
 751 static void vlan_dev_netpoll_cleanup(struct net_device *dev)
 752 {
 753         struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
 754         struct netpoll *netpoll = vlan->netpoll;
 755
 756         if (!netpoll)
 757                 return;
 758
 759         vlan->netpoll = NULL;
 760         __netpoll_free(netpoll);
 761 }
 762 #endif /* CONFIG_NET_POLL_CONTROLLER */
 763
 764 static int vlan_dev_get_iflink(const struct net_device *dev)
 765 {
 766         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 767
 768         return real_dev->ifindex;
 769 }
 770
 771 static const struct ethtool_ops vlan_ethtool_ops = {
 772         .get_link_ksettings     = vlan_ethtool_get_link_ksettings,
 773         .get_drvinfo            = vlan_ethtool_get_drvinfo,
 774         .get_link               = ethtool_op_get_link,
 775         .get_ts_info            = vlan_ethtool_get_ts_info,
 776 };
 777
 778 static const struct net_device_ops vlan_netdev_ops = {
 779         .ndo_change_mtu         = vlan_dev_change_mtu,
 780         .ndo_init               = vlan_dev_init,
 781         .ndo_uninit             = vlan_dev_uninit,
 782         .ndo_open               = vlan_dev_open,
 783         .ndo_stop               = vlan_dev_stop,
 784         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
 785         .ndo_validate_addr      = eth_validate_addr,
 786         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 787         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 788         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 789         .ndo_do_ioctl           = vlan_dev_ioctl,
 790         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 791         .ndo_get_stats64        = vlan_dev_get_stats64,
 792 #if IS_ENABLED(CONFIG_FCOE)
 793         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 794         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 795         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 796         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 797         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 798         .ndo_fcoe_ddp_target    = vlan_dev_fcoe_ddp_target,
 799 #endif
 800 #ifdef CONFIG_NET_POLL_CONTROLLER
 801         .ndo_poll_controller    = vlan_dev_poll_controller,
 802         .ndo_netpoll_setup      = vlan_dev_netpoll_setup,
 803         .ndo_netpoll_cleanup    = vlan_dev_netpoll_cleanup,
 804 #endif
 805         .ndo_fix_features       = vlan_dev_fix_features,
 806         .ndo_get_lock_subclass  = vlan_dev_get_lock_subclass,
 807         .ndo_get_iflink         = vlan_dev_get_iflink,
 808 };
 809
 810 static void vlan_dev_free(struct net_device *dev)
 811 {
 812         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 813
 814         free_percpu(vlan->vlan_pcpu_stats);
 815         vlan->vlan_pcpu_stats = NULL;
 816 }
 817
 818 void vlan_setup(struct net_device *dev)
 819 {
 820         ether_setup(dev);
 821
 822         dev->priv_flags         |= IFF_802_1Q_VLAN | IFF_NO_QUEUE;
 823         dev->priv_flags         |= IFF_UNICAST_FLT;
 824         dev->priv_flags         &= ~IFF_TX_SKB_SHARING;
 825         netif_keep_dst(dev);
 826
 827         dev->netdev_ops         = &vlan_netdev_ops;
 828         dev->needs_free_netdev  = true;
 829         dev->priv_destructor    = vlan_dev_free;
 830         dev->ethtool_ops        = &vlan_ethtool_ops;
 831
 832         dev->min_mtu            = 0;
 833         dev->max_mtu            = ETH_MAX_MTU;
 834
 835         eth_zero_addr(dev->broadcast);
 836 }