net/8021q/vlan_dev.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* -*- linux-c -*-
   3  * INET         802.1Q VLAN
   4  *              Ethernet-type device handling.
   5  *
   6  * Authors:     Ben Greear <greearb@candelatech.com>
   7  *              Please send support related email to: netdev@vger.kernel.org
   8  *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
   9  *
  10  * Fixes:       Mar 22 2001: Martin Bokaemper <mbokaemper@unispherenetworks.com>
  11  *                - reset skb->pkt_type on incoming packets when MAC was changed
  12  *                - see that changed MAC is saddr for outgoing packets
  13  *              Oct 20, 2001:  Ard van Breeman:
  14  *                - Fix MC-list, finally.
  15  *                - Flush MC-list on VLAN destroy.
  16  */
  17
  18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  19
  20 #include <linux/module.h>
  21 #include <linux/slab.h>
  22 #include <linux/skbuff.h>
  23 #include <linux/netdevice.h>
  24 #include <linux/net_tstamp.h>
  25 #include <linux/etherdevice.h>
  26 #include <linux/ethtool.h>
  27 #include <linux/phy.h>
  28 #include <net/arp.h>
  29 #include <net/macsec.h>
  30
  31 #include "vlan.h"
  32 #include "vlanproc.h"
  33 #include <linux/if_vlan.h>
  34 #include <linux/netpoll.h>
  35
  36 /*
  37  *      Create the VLAN header for an arbitrary protocol layer
  38  *
  39  *      saddr=NULL      means use device source address
  40  *      daddr=NULL      means leave destination address (eg unresolved arp)
  41  *
  42  *  This is called when the SKB is moving down the stack towards the
  43  *  physical devices.
  44  */
  45 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
  46                                 unsigned short type,
  47                                 const void *daddr, const void *saddr,
  48                                 unsigned int len)
  49 {
  50         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
  51         struct vlan_hdr *vhdr;
  52         unsigned int vhdrlen = 0;
  53         u16 vlan_tci = 0;
  54         int rc;
  55
  56         if (!(vlan->flags & VLAN_FLAG_REORDER_HDR)) {
  57                 vhdr = skb_push(skb, VLAN_HLEN);
  58
  59                 vlan_tci = vlan->vlan_id;
  60                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
  61                 vhdr->h_vlan_TCI = htons(vlan_tci);
  62
  63                 /*
  64                  *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
  65                  *  put the length in here instead.
  66                  */
  67                 if (type != ETH_P_802_3 && type != ETH_P_802_2)
  68                         vhdr->h_vlan_encapsulated_proto = htons(type);
  69                 else
  70                         vhdr->h_vlan_encapsulated_proto = htons(len);
  71
  72                 skb->protocol = vlan->vlan_proto;
  73                 type = ntohs(vlan->vlan_proto);
  74                 vhdrlen = VLAN_HLEN;
  75         }
  76
  77         /* Before delegating work to the lower layer, enter our MAC-address */
  78         if (saddr == NULL)
  79                 saddr = dev->dev_addr;
  80
  81         /* Now make the underlying real hard header */
  82         dev = vlan->real_dev;
  83         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
  84         if (rc > 0)
  85                 rc += vhdrlen;
  86         return rc;
  87 }
  88
  89 static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb)
  90 {
  91 #ifdef CONFIG_NET_POLL_CONTROLLER
  92         return netpoll_send_skb(vlan->netpoll, skb);
  93 #else
  94         BUG();
  95         return NETDEV_TX_OK;
  96 #endif
  97 }
  98
  99 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
 100                                             struct net_device *dev)
 101 {
 102         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 103         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 104         unsigned int len;
 105         int ret;
 106
 107         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
 108          *
 109          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
 110          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
 111          */
 112         if (vlan->flags & VLAN_FLAG_REORDER_HDR ||
 113             veth->h_vlan_proto != vlan->vlan_proto) {
 114                 u16 vlan_tci;
 115                 vlan_tci = vlan->vlan_id;
 116                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
 117                 __vlan_hwaccel_put_tag(skb, vlan->vlan_proto, vlan_tci);
 118         }
 119
 120         skb->dev = vlan->real_dev;
 121         len = skb->len;
 122         if (unlikely(netpoll_tx_running(dev)))
 123                 return vlan_netpoll_send_skb(vlan, skb);
 124
 125         ret = dev_queue_xmit(skb);
 126
 127         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 128                 struct vlan_pcpu_stats *stats;
 129
 130                 stats = this_cpu_ptr(vlan->vlan_pcpu_stats);
 131                 u64_stats_update_begin(&stats->syncp);
 132                 u64_stats_inc(&stats->tx_packets);
 133                 u64_stats_add(&stats->tx_bytes, len);
 134                 u64_stats_update_end(&stats->syncp);
 135         } else {
 136                 this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped);
 137         }
 138
 139         return ret;
 140 }
 141
 142 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
 143 {
 144         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 145         unsigned int max_mtu = real_dev->mtu;
 146
 147         if (netif_reduces_vlan_mtu(real_dev))
 148                 max_mtu -= VLAN_HLEN;
 149         if (max_mtu < new_mtu)
 150                 return -ERANGE;
 151
 152         dev->mtu = new_mtu;
 153
 154         return 0;
 155 }
 156
 157 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 158                                    u32 skb_prio, u16 vlan_prio)
 159 {
 160         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 161
 162         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
 163                 vlan->nr_ingress_mappings--;
 164         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
 165                 vlan->nr_ingress_mappings++;
 166
 167         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 168 }
 169
 170 int vlan_dev_set_egress_priority(const struct net_device *dev,
 171                                  u32 skb_prio, u16 vlan_prio)
 172 {
 173         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 174         struct vlan_priority_tci_mapping *mp = NULL;
 175         struct vlan_priority_tci_mapping *np;
 176         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
 177
 178         /* See if a priority mapping exists.. */
 179         mp = vlan->egress_priority_map[skb_prio & 0xF];
 180         while (mp) {
 181                 if (mp->priority == skb_prio) {
 182                         if (mp->vlan_qos && !vlan_qos)
 183                                 vlan->nr_egress_mappings--;
 184                         else if (!mp->vlan_qos && vlan_qos)
 185                                 vlan->nr_egress_mappings++;
 186                         mp->vlan_qos = vlan_qos;
 187                         return 0;
 188                 }
 189                 mp = mp->next;
 190         }
 191
 192         /* Create a new mapping then. */
 193         mp = vlan->egress_priority_map[skb_prio & 0xF];
 194         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 195         if (!np)
 196                 return -ENOBUFS;
 197
 198         np->next = mp;
 199         np->priority = skb_prio;
 200         np->vlan_qos = vlan_qos;
 201         /* Before inserting this element in hash table, make sure all its fields
 202          * are committed to memory.
 203          * coupled with smp_rmb() in vlan_dev_get_egress_qos_mask()
 204          */
 205         smp_wmb();
 206         vlan->egress_priority_map[skb_prio & 0xF] = np;
 207         if (vlan_qos)
 208                 vlan->nr_egress_mappings++;
 209         return 0;
 210 }
 211
 212 /* Flags are defined in the vlan_flags enum in
 213  * include/uapi/linux/if_vlan.h file.
 214  */
 215 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 216 {
 217         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 218         u32 old_flags = vlan->flags;
 219
 220         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
 221                      VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP |
 222                      VLAN_FLAG_BRIDGE_BINDING))
 223                 return -EINVAL;
 224
 225         vlan->flags = (old_flags & ~mask) | (flags & mask);
 226
 227         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
 228                 if (vlan->flags & VLAN_FLAG_GVRP)
 229                         vlan_gvrp_request_join(dev);
 230                 else
 231                         vlan_gvrp_request_leave(dev);
 232         }
 233
 234         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) {
 235                 if (vlan->flags & VLAN_FLAG_MVRP)
 236                         vlan_mvrp_request_join(dev);
 237                 else
 238                         vlan_mvrp_request_leave(dev);
 239         }
 240         return 0;
 241 }
 242
 243 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result, size_t size)
 244 {
 245         strscpy_pad(result, vlan_dev_priv(dev)->real_dev->name, size);
 246 }
 247
 248 bool vlan_dev_inherit_address(struct net_device *dev,
 249                               struct net_device *real_dev)
 250 {
 251         if (dev->addr_assign_type != NET_ADDR_STOLEN)
 252                 return false;
 253
 254         eth_hw_addr_set(dev, real_dev->dev_addr);
 255         call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
 256         return true;
 257 }
 258
 259 static int vlan_dev_open(struct net_device *dev)
 260 {
 261         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 262         struct net_device *real_dev = vlan->real_dev;
 263         int err;
 264
 265         if (!(real_dev->flags & IFF_UP) &&
 266             !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 267                 return -ENETDOWN;
 268
 269         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr) &&
 270             !vlan_dev_inherit_address(dev, real_dev)) {
 271                 err = dev_uc_add(real_dev, dev->dev_addr);
 272                 if (err < 0)
 273                         goto out;
 274         }
 275
 276         if (dev->flags & IFF_ALLMULTI) {
 277                 err = dev_set_allmulti(real_dev, 1);
 278                 if (err < 0)
 279                         goto del_unicast;
 280         }
 281         if (dev->flags & IFF_PROMISC) {
 282                 err = dev_set_promiscuity(real_dev, 1);
 283                 if (err < 0)
 284                         goto clear_allmulti;
 285         }
 286
 287         ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr);
 288
 289         if (vlan->flags & VLAN_FLAG_GVRP)
 290                 vlan_gvrp_request_join(dev);
 291
 292         if (vlan->flags & VLAN_FLAG_MVRP)
 293                 vlan_mvrp_request_join(dev);
 294
 295         if (netif_carrier_ok(real_dev) &&
 296             !(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
 297                 netif_carrier_on(dev);
 298         return 0;
 299
 300 clear_allmulti:
 301         if (dev->flags & IFF_ALLMULTI)
 302                 dev_set_allmulti(real_dev, -1);
 303 del_unicast:
 304         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 305                 dev_uc_del(real_dev, dev->dev_addr);
 306 out:
 307         netif_carrier_off(dev);
 308         return err;
 309 }
 310
 311 static int vlan_dev_stop(struct net_device *dev)
 312 {
 313         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 314         struct net_device *real_dev = vlan->real_dev;
 315
 316         dev_mc_unsync(real_dev, dev);
 317         dev_uc_unsync(real_dev, dev);
 318         if (dev->flags & IFF_ALLMULTI)
 319                 dev_set_allmulti(real_dev, -1);
 320         if (dev->flags & IFF_PROMISC)
 321                 dev_set_promiscuity(real_dev, -1);
 322
 323         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 324                 dev_uc_del(real_dev, dev->dev_addr);
 325
 326         if (!(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
 327                 netif_carrier_off(dev);
 328         return 0;
 329 }
 330
 331 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 332 {
 333         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 334         struct sockaddr *addr = p;
 335         int err;
 336
 337         if (!is_valid_ether_addr(addr->sa_data))
 338                 return -EADDRNOTAVAIL;
 339
 340         if (!(dev->flags & IFF_UP))
 341                 goto out;
 342
 343         if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) {
 344                 err = dev_uc_add(real_dev, addr->sa_data);
 345                 if (err < 0)
 346                         return err;
 347         }
 348
 349         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 350                 dev_uc_del(real_dev, dev->dev_addr);
 351
 352 out:
 353         eth_hw_addr_set(dev, addr->sa_data);
 354         return 0;
 355 }
 356
 357 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 358 {
 359         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 360         const struct net_device_ops *ops = real_dev->netdev_ops;
 361         struct ifreq ifrr;
 362         int err = -EOPNOTSUPP;
 363
 364         strscpy_pad(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 365         ifrr.ifr_ifru = ifr->ifr_ifru;
 366
 367         switch (cmd) {
 368         case SIOCSHWTSTAMP:
 369                 if (!net_eq(dev_net(dev), dev_net(real_dev)))
 370                         break;
 371                 fallthrough;
 372         case SIOCGMIIPHY:
 373         case SIOCGMIIREG:
 374         case SIOCSMIIREG:
 375         case SIOCGHWTSTAMP:
 376                 if (netif_device_present(real_dev) && ops->ndo_eth_ioctl)
 377                         err = ops->ndo_eth_ioctl(real_dev, &ifrr, cmd);
 378                 break;
 379         }
 380
 381         if (!err)
 382                 ifr->ifr_ifru = ifrr.ifr_ifru;
 383
 384         return err;
 385 }
 386
 387 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
 388 {
 389         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 390         const struct net_device_ops *ops = real_dev->netdev_ops;
 391         int err = 0;
 392
 393         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
 394                 err = ops->ndo_neigh_setup(real_dev, pa);
 395
 396         return err;
 397 }
 398
 399 #if IS_ENABLED(CONFIG_FCOE)
 400 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
 401                                    struct scatterlist *sgl, unsigned int sgc)
 402 {
 403         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 404         const struct net_device_ops *ops = real_dev->netdev_ops;
 405         int rc = 0;
 406
 407         if (ops->ndo_fcoe_ddp_setup)
 408                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
 409
 410         return rc;
 411 }
 412
 413 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
 414 {
 415         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 416         const struct net_device_ops *ops = real_dev->netdev_ops;
 417         int len = 0;
 418
 419         if (ops->ndo_fcoe_ddp_done)
 420                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
 421
 422         return len;
 423 }
 424
 425 static int vlan_dev_fcoe_enable(struct net_device *dev)
 426 {
 427         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 428         const struct net_device_ops *ops = real_dev->netdev_ops;
 429         int rc = -EINVAL;
 430
 431         if (ops->ndo_fcoe_enable)
 432                 rc = ops->ndo_fcoe_enable(real_dev);
 433         return rc;
 434 }
 435
 436 static int vlan_dev_fcoe_disable(struct net_device *dev)
 437 {
 438         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 439         const struct net_device_ops *ops = real_dev->netdev_ops;
 440         int rc = -EINVAL;
 441
 442         if (ops->ndo_fcoe_disable)
 443                 rc = ops->ndo_fcoe_disable(real_dev);
 444         return rc;
 445 }
 446
 447 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
 448                                     struct scatterlist *sgl, unsigned int sgc)
 449 {
 450         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 451         const struct net_device_ops *ops = real_dev->netdev_ops;
 452         int rc = 0;
 453
 454         if (ops->ndo_fcoe_ddp_target)
 455                 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
 456
 457         return rc;
 458 }
 459 #endif
 460
 461 #ifdef NETDEV_FCOE_WWNN
 462 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
 463 {
 464         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 465         const struct net_device_ops *ops = real_dev->netdev_ops;
 466         int rc = -EINVAL;
 467
 468         if (ops->ndo_fcoe_get_wwn)
 469                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
 470         return rc;
 471 }
 472 #endif
 473
 474 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 475 {
 476         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 477
 478         if (dev->flags & IFF_UP) {
 479                 if (change & IFF_ALLMULTI)
 480                         dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 481                 if (change & IFF_PROMISC)
 482                         dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 483         }
 484 }
 485
 486 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 487 {
 488         dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 489         dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 490 }
 491
 492 /*
 493  * vlan network devices have devices nesting below it, and are a special
 494  * "super class" of normal network devices; split their locks off into a
 495  * separate class since they always nest.
 496  */
 497 static struct lock_class_key vlan_netdev_xmit_lock_key;
 498 static struct lock_class_key vlan_netdev_addr_lock_key;
 499
 500 static void vlan_dev_set_lockdep_one(struct net_device *dev,
 501                                      struct netdev_queue *txq,
 502                                      void *unused)
 503 {
 504         lockdep_set_class(&txq->_xmit_lock, &vlan_netdev_xmit_lock_key);
 505 }
 506
 507 static void vlan_dev_set_lockdep_class(struct net_device *dev)
 508 {
 509         lockdep_set_class(&dev->addr_list_lock,
 510                           &vlan_netdev_addr_lock_key);
 511         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, NULL);
 512 }
 513
 514 static __be16 vlan_parse_protocol(const struct sk_buff *skb)
 515 {
 516         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 517
 518         return __vlan_get_protocol(skb, veth->h_vlan_proto, NULL);
 519 }
 520
 521 static const struct header_ops vlan_header_ops = {
 522         .create  = vlan_dev_hard_header,
 523         .parse   = eth_header_parse,
 524         .parse_protocol = vlan_parse_protocol,
 525 };
 526
 527 static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
 528                                      unsigned short type,
 529                                      const void *daddr, const void *saddr,
 530                                      unsigned int len)
 531 {
 532         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 533         struct net_device *real_dev = vlan->real_dev;
 534
 535         if (saddr == NULL)
 536                 saddr = dev->dev_addr;
 537
 538         return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
 539 }
 540
 541 static const struct header_ops vlan_passthru_header_ops = {
 542         .create  = vlan_passthru_hard_header,
 543         .parse   = eth_header_parse,
 544         .parse_protocol = vlan_parse_protocol,
 545 };
 546
 547 static struct device_type vlan_type = {
 548         .name   = "vlan",
 549 };
 550
 551 static const struct net_device_ops vlan_netdev_ops;
 552
 553 static int vlan_dev_init(struct net_device *dev)
 554 {
 555         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 556         struct net_device *real_dev = vlan->real_dev;
 557
 558         netif_carrier_off(dev);
 559
 560         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 561         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
 562                                           IFF_MASTER | IFF_SLAVE);
 563         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 564                                           (1<<__LINK_STATE_DORMANT))) |
 565                       (1<<__LINK_STATE_PRESENT);
 566
 567         if (vlan->flags & VLAN_FLAG_BRIDGE_BINDING)
 568                 dev->state |= (1 << __LINK_STATE_NOCARRIER);
 569
 570         dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG |
 571                            NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
 572                            NETIF_F_GSO_ENCAP_ALL |
 573                            NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC |
 574                            NETIF_F_ALL_FCOE;
 575
 576         if (real_dev->vlan_features & NETIF_F_HW_MACSEC)
 577                 dev->hw_features |= NETIF_F_HW_MACSEC;
 578
 579         dev->features |= dev->hw_features | NETIF_F_LLTX;
 580         netif_inherit_tso_max(dev, real_dev);
 581         if (dev->features & NETIF_F_VLAN_FEATURES)
 582                 netdev_warn(real_dev, "VLAN features are set incorrectly.  Q-in-Q configurations may not work correctly.\n");
 583
 584         dev->vlan_features = real_dev->vlan_features & ~NETIF_F_ALL_FCOE;
 585         dev->hw_enc_features = vlan_tnl_features(real_dev);
 586         dev->mpls_features = real_dev->mpls_features;
 587
 588         /* ipv6 shared card related stuff */
 589         dev->dev_id = real_dev->dev_id;
 590
 591         if (is_zero_ether_addr(dev->dev_addr)) {
 592                 eth_hw_addr_set(dev, real_dev->dev_addr);
 593                 dev->addr_assign_type = NET_ADDR_STOLEN;
 594         }
 595         if (is_zero_ether_addr(dev->broadcast))
 596                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 597
 598 #if IS_ENABLED(CONFIG_FCOE)
 599         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
 600 #endif
 601
 602         dev->needed_headroom = real_dev->needed_headroom;
 603         if (vlan_hw_offload_capable(real_dev->features, vlan->vlan_proto)) {
 604                 dev->header_ops      = &vlan_passthru_header_ops;
 605                 dev->hard_header_len = real_dev->hard_header_len;
 606         } else {
 607                 dev->header_ops      = &vlan_header_ops;
 608                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 609         }
 610
 611         dev->netdev_ops = &vlan_netdev_ops;
 612
 613         SET_NETDEV_DEVTYPE(dev, &vlan_type);
 614
 615         vlan_dev_set_lockdep_class(dev);
 616
 617         vlan->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 618         if (!vlan->vlan_pcpu_stats)
 619                 return -ENOMEM;
 620
 621         /* Get vlan's reference to real_dev */
 622         netdev_hold(real_dev, &vlan->dev_tracker, GFP_KERNEL);
 623
 624         return 0;
 625 }
 626
 627 /* Note: this function might be called multiple times for the same device. */
 628 void vlan_dev_free_egress_priority(const struct net_device *dev)
 629 {
 630         struct vlan_priority_tci_mapping *pm;
 631         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 632         int i;
 633
 634         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 635                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 636                         vlan->egress_priority_map[i] = pm->next;
 637                         kfree(pm);
 638                 }
 639         }
 640 }
 641
 642 static void vlan_dev_uninit(struct net_device *dev)
 643 {
 644         vlan_dev_free_egress_priority(dev);
 645 }
 646
 647 static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
 648         netdev_features_t features)
 649 {
 650         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 651         netdev_features_t old_features = features;
 652         netdev_features_t lower_features;
 653
 654         lower_features = netdev_intersect_features((real_dev->vlan_features |
 655                                                     NETIF_F_RXCSUM),
 656                                                    real_dev->features);
 657
 658         /* Add HW_CSUM setting to preserve user ability to control
 659          * checksum offload on the vlan device.
 660          */
 661         if (lower_features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
 662                 lower_features |= NETIF_F_HW_CSUM;
 663         features = netdev_intersect_features(features, lower_features);
 664         features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE);
 665         features |= NETIF_F_LLTX;
 666
 667         return features;
 668 }
 669
 670 static int vlan_ethtool_get_link_ksettings(struct net_device *dev,
 671                                            struct ethtool_link_ksettings *cmd)
 672 {
 673         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 674
 675         return __ethtool_get_link_ksettings(vlan->real_dev, cmd);
 676 }
 677
 678 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
 679                                      struct ethtool_drvinfo *info)
 680 {
 681         strscpy(info->driver, vlan_fullname, sizeof(info->driver));
 682         strscpy(info->version, vlan_version, sizeof(info->version));
 683         strscpy(info->fw_version, "N/A", sizeof(info->fw_version));
 684 }
 685
 686 static int vlan_ethtool_get_ts_info(struct net_device *dev,
 687                                     struct ethtool_ts_info *info)
 688 {
 689         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 690         const struct ethtool_ops *ops = vlan->real_dev->ethtool_ops;
 691         struct phy_device *phydev = vlan->real_dev->phydev;
 692
 693         if (phy_has_tsinfo(phydev)) {
 694                 return phy_ts_info(phydev, info);
 695         } else if (ops->get_ts_info) {
 696                 return ops->get_ts_info(vlan->real_dev, info);
 697         } else {
 698                 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
 699                         SOF_TIMESTAMPING_SOFTWARE;
 700                 info->phc_index = -1;
 701         }
 702
 703         return 0;
 704 }
 705
 706 static void vlan_dev_get_stats64(struct net_device *dev,
 707                                  struct rtnl_link_stats64 *stats)
 708 {
 709         struct vlan_pcpu_stats *p;
 710         u32 rx_errors = 0, tx_dropped = 0;
 711         int i;
 712
 713         for_each_possible_cpu(i) {
 714                 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
 715                 unsigned int start;
 716
 717                 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
 718                 do {
 719                         start = u64_stats_fetch_begin(&p->syncp);
 720                         rxpackets       = u64_stats_read(&p->rx_packets);
 721                         rxbytes         = u64_stats_read(&p->rx_bytes);
 722                         rxmulticast     = u64_stats_read(&p->rx_multicast);
 723                         txpackets       = u64_stats_read(&p->tx_packets);
 724                         txbytes         = u64_stats_read(&p->tx_bytes);
 725                 } while (u64_stats_fetch_retry(&p->syncp, start));
 726
 727                 stats->rx_packets       += rxpackets;
 728                 stats->rx_bytes         += rxbytes;
 729                 stats->multicast        += rxmulticast;
 730                 stats->tx_packets       += txpackets;
 731                 stats->tx_bytes         += txbytes;
 732                 /* rx_errors & tx_dropped are u32 */
 733                 rx_errors       += READ_ONCE(p->rx_errors);
 734                 tx_dropped      += READ_ONCE(p->tx_dropped);
 735         }
 736         stats->rx_errors  = rx_errors;
 737         stats->tx_dropped = tx_dropped;
 738 }
 739
 740 #ifdef CONFIG_NET_POLL_CONTROLLER
 741 static void vlan_dev_poll_controller(struct net_device *dev)
 742 {
 743         return;
 744 }
 745
 746 static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
 747 {
 748         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 749         struct net_device *real_dev = vlan->real_dev;
 750         struct netpoll *netpoll;
 751         int err = 0;
 752
 753         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 754         err = -ENOMEM;
 755         if (!netpoll)
 756                 goto out;
 757
 758         err = __netpoll_setup(netpoll, real_dev);
 759         if (err) {
 760                 kfree(netpoll);
 761                 goto out;
 762         }
 763
 764         vlan->netpoll = netpoll;
 765
 766 out:
 767         return err;
 768 }
 769
 770 static void vlan_dev_netpoll_cleanup(struct net_device *dev)
 771 {
 772         struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
 773         struct netpoll *netpoll = vlan->netpoll;
 774
 775         if (!netpoll)
 776                 return;
 777
 778         vlan->netpoll = NULL;
 779         __netpoll_free(netpoll);
 780 }
 781 #endif /* CONFIG_NET_POLL_CONTROLLER */
 782
 783 static int vlan_dev_get_iflink(const struct net_device *dev)
 784 {
 785         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 786
 787         return real_dev->ifindex;
 788 }
 789
 790 static int vlan_dev_fill_forward_path(struct net_device_path_ctx *ctx,
 791                                       struct net_device_path *path)
 792 {
 793         struct vlan_dev_priv *vlan = vlan_dev_priv(ctx->dev);
 794
 795         path->type = DEV_PATH_VLAN;
 796         path->encap.id = vlan->vlan_id;
 797         path->encap.proto = vlan->vlan_proto;
 798         path->dev = ctx->dev;
 799         ctx->dev = vlan->real_dev;
 800         if (ctx->num_vlans >= ARRAY_SIZE(ctx->vlan))
 801                 return -ENOSPC;
 802
 803         ctx->vlan[ctx->num_vlans].id = vlan->vlan_id;
 804         ctx->vlan[ctx->num_vlans].proto = vlan->vlan_proto;
 805         ctx->num_vlans++;
 806
 807         return 0;
 808 }
 809
 810 #if IS_ENABLED(CONFIG_MACSEC)
 811
 812 static const struct macsec_ops *vlan_get_macsec_ops(const struct macsec_context *ctx)
 813 {
 814         return vlan_dev_priv(ctx->netdev)->real_dev->macsec_ops;
 815 }
 816
 817 static int vlan_macsec_offload(int (* const func)(struct macsec_context *),
 818                                struct macsec_context *ctx)
 819 {
 820         if (unlikely(!func))
 821                 return 0;
 822
 823         return (*func)(ctx);
 824 }
 825
 826 static int vlan_macsec_dev_open(struct macsec_context *ctx)
 827 {
 828         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 829
 830         if (!ops)
 831                 return -EOPNOTSUPP;
 832
 833         return vlan_macsec_offload(ops->mdo_dev_open, ctx);
 834 }
 835
 836 static int vlan_macsec_dev_stop(struct macsec_context *ctx)
 837 {
 838         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 839
 840         if (!ops)
 841                 return -EOPNOTSUPP;
 842
 843         return vlan_macsec_offload(ops->mdo_dev_stop, ctx);
 844 }
 845
 846 static int vlan_macsec_add_secy(struct macsec_context *ctx)
 847 {
 848         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 849
 850         if (!ops)
 851                 return -EOPNOTSUPP;
 852
 853         return vlan_macsec_offload(ops->mdo_add_secy, ctx);
 854 }
 855
 856 static int vlan_macsec_upd_secy(struct macsec_context *ctx)
 857 {
 858         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 859
 860         if (!ops)
 861                 return -EOPNOTSUPP;
 862
 863         return vlan_macsec_offload(ops->mdo_upd_secy, ctx);
 864 }
 865
 866 static int vlan_macsec_del_secy(struct macsec_context *ctx)
 867 {
 868         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 869
 870         if (!ops)
 871                 return -EOPNOTSUPP;
 872
 873         return vlan_macsec_offload(ops->mdo_del_secy, ctx);
 874 }
 875
 876 static int vlan_macsec_add_rxsc(struct macsec_context *ctx)
 877 {
 878         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 879
 880         if (!ops)
 881                 return -EOPNOTSUPP;
 882
 883         return vlan_macsec_offload(ops->mdo_add_rxsc, ctx);
 884 }
 885
 886 static int vlan_macsec_upd_rxsc(struct macsec_context *ctx)
 887 {
 888         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 889
 890         if (!ops)
 891                 return -EOPNOTSUPP;
 892
 893         return vlan_macsec_offload(ops->mdo_upd_rxsc, ctx);
 894 }
 895
 896 static int vlan_macsec_del_rxsc(struct macsec_context *ctx)
 897 {
 898         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 899
 900         if (!ops)
 901                 return -EOPNOTSUPP;
 902
 903         return vlan_macsec_offload(ops->mdo_del_rxsc, ctx);
 904 }
 905
 906 static int vlan_macsec_add_rxsa(struct macsec_context *ctx)
 907 {
 908         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 909
 910         if (!ops)
 911                 return -EOPNOTSUPP;
 912
 913         return vlan_macsec_offload(ops->mdo_add_rxsa, ctx);
 914 }
 915
 916 static int vlan_macsec_upd_rxsa(struct macsec_context *ctx)
 917 {
 918         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 919
 920         if (!ops)
 921                 return -EOPNOTSUPP;
 922
 923         return vlan_macsec_offload(ops->mdo_upd_rxsa, ctx);
 924 }
 925
 926 static int vlan_macsec_del_rxsa(struct macsec_context *ctx)
 927 {
 928         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 929
 930         if (!ops)
 931                 return -EOPNOTSUPP;
 932
 933         return vlan_macsec_offload(ops->mdo_del_rxsa, ctx);
 934 }
 935
 936 static int vlan_macsec_add_txsa(struct macsec_context *ctx)
 937 {
 938         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 939
 940         if (!ops)
 941                 return -EOPNOTSUPP;
 942
 943         return vlan_macsec_offload(ops->mdo_add_txsa, ctx);
 944 }
 945
 946 static int vlan_macsec_upd_txsa(struct macsec_context *ctx)
 947 {
 948         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 949
 950         if (!ops)
 951                 return -EOPNOTSUPP;
 952
 953         return vlan_macsec_offload(ops->mdo_upd_txsa, ctx);
 954 }
 955
 956 static int vlan_macsec_del_txsa(struct macsec_context *ctx)
 957 {
 958         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 959
 960         if (!ops)
 961                 return -EOPNOTSUPP;
 962
 963         return vlan_macsec_offload(ops->mdo_del_txsa, ctx);
 964 }
 965
 966 static int vlan_macsec_get_dev_stats(struct macsec_context *ctx)
 967 {
 968         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 969
 970         if (!ops)
 971                 return -EOPNOTSUPP;
 972
 973         return vlan_macsec_offload(ops->mdo_get_dev_stats, ctx);
 974 }
 975
 976 static int vlan_macsec_get_tx_sc_stats(struct macsec_context *ctx)
 977 {
 978         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 979
 980         if (!ops)
 981                 return -EOPNOTSUPP;
 982
 983         return vlan_macsec_offload(ops->mdo_get_tx_sc_stats, ctx);
 984 }
 985
 986 static int vlan_macsec_get_tx_sa_stats(struct macsec_context *ctx)
 987 {
 988         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 989
 990         if (!ops)
 991                 return -EOPNOTSUPP;
 992
 993         return vlan_macsec_offload(ops->mdo_get_tx_sa_stats, ctx);
 994 }
 995
 996 static int vlan_macsec_get_rx_sc_stats(struct macsec_context *ctx)
 997 {
 998         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 999
1000         if (!ops)
1001                 return -EOPNOTSUPP;
1002
1003         return vlan_macsec_offload(ops->mdo_get_rx_sc_stats, ctx);
1004 }
1005
1006 static int vlan_macsec_get_rx_sa_stats(struct macsec_context *ctx)
1007 {
1008         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
1009
1010         if (!ops)
1011                 return -EOPNOTSUPP;
1012
1013         return vlan_macsec_offload(ops->mdo_get_rx_sa_stats, ctx);
1014 }
1015
1016 static const struct macsec_ops macsec_offload_ops = {
1017         /* Device wide */
1018         .mdo_dev_open = vlan_macsec_dev_open,
1019         .mdo_dev_stop = vlan_macsec_dev_stop,
1020         /* SecY */
1021         .mdo_add_secy = vlan_macsec_add_secy,
1022         .mdo_upd_secy = vlan_macsec_upd_secy,
1023         .mdo_del_secy = vlan_macsec_del_secy,
1024         /* Security channels */
1025         .mdo_add_rxsc = vlan_macsec_add_rxsc,
1026         .mdo_upd_rxsc = vlan_macsec_upd_rxsc,
1027         .mdo_del_rxsc = vlan_macsec_del_rxsc,
1028         /* Security associations */
1029         .mdo_add_rxsa = vlan_macsec_add_rxsa,
1030         .mdo_upd_rxsa = vlan_macsec_upd_rxsa,
1031         .mdo_del_rxsa = vlan_macsec_del_rxsa,
1032         .mdo_add_txsa = vlan_macsec_add_txsa,
1033         .mdo_upd_txsa = vlan_macsec_upd_txsa,
1034         .mdo_del_txsa = vlan_macsec_del_txsa,
1035         /* Statistics */
1036         .mdo_get_dev_stats = vlan_macsec_get_dev_stats,
1037         .mdo_get_tx_sc_stats = vlan_macsec_get_tx_sc_stats,
1038         .mdo_get_tx_sa_stats = vlan_macsec_get_tx_sa_stats,
1039         .mdo_get_rx_sc_stats = vlan_macsec_get_rx_sc_stats,
1040         .mdo_get_rx_sa_stats = vlan_macsec_get_rx_sa_stats,
1041 };
1042
1043 #endif
1044
1045 static const struct ethtool_ops vlan_ethtool_ops = {
1046         .get_link_ksettings     = vlan_ethtool_get_link_ksettings,
1047         .get_drvinfo            = vlan_ethtool_get_drvinfo,
1048         .get_link               = ethtool_op_get_link,
1049         .get_ts_info            = vlan_ethtool_get_ts_info,
1050 };
1051
1052 static const struct net_device_ops vlan_netdev_ops = {
1053         .ndo_change_mtu         = vlan_dev_change_mtu,
1054         .ndo_init               = vlan_dev_init,
1055         .ndo_uninit             = vlan_dev_uninit,
1056         .ndo_open               = vlan_dev_open,
1057         .ndo_stop               = vlan_dev_stop,
1058         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
1059         .ndo_validate_addr      = eth_validate_addr,
1060         .ndo_set_mac_address    = vlan_dev_set_mac_address,
1061         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
1062         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
1063         .ndo_eth_ioctl          = vlan_dev_ioctl,
1064         .ndo_neigh_setup        = vlan_dev_neigh_setup,
1065         .ndo_get_stats64        = vlan_dev_get_stats64,
1066 #if IS_ENABLED(CONFIG_FCOE)
1067         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
1068         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
1069         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
1070         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
1071         .ndo_fcoe_ddp_target    = vlan_dev_fcoe_ddp_target,
1072 #endif
1073 #ifdef NETDEV_FCOE_WWNN
1074         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
1075 #endif
1076 #ifdef CONFIG_NET_POLL_CONTROLLER
1077         .ndo_poll_controller    = vlan_dev_poll_controller,
1078         .ndo_netpoll_setup      = vlan_dev_netpoll_setup,
1079         .ndo_netpoll_cleanup    = vlan_dev_netpoll_cleanup,
1080 #endif
1081         .ndo_fix_features       = vlan_dev_fix_features,
1082         .ndo_get_iflink         = vlan_dev_get_iflink,
1083         .ndo_fill_forward_path  = vlan_dev_fill_forward_path,
1084 };
1085
1086 static void vlan_dev_free(struct net_device *dev)
1087 {
1088         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
1089
1090         free_percpu(vlan->vlan_pcpu_stats);
1091         vlan->vlan_pcpu_stats = NULL;
1092
1093         /* Get rid of the vlan's reference to real_dev */
1094         netdev_put(vlan->real_dev, &vlan->dev_tracker);
1095 }
1096
1097 void vlan_setup(struct net_device *dev)
1098 {
1099         ether_setup(dev);
1100
1101         dev->priv_flags         |= IFF_802_1Q_VLAN | IFF_NO_QUEUE;
1102         dev->priv_flags         |= IFF_UNICAST_FLT;
1103         dev->priv_flags         &= ~IFF_TX_SKB_SHARING;
1104         netif_keep_dst(dev);
1105
1106         dev->netdev_ops         = &vlan_netdev_ops;
1107         dev->needs_free_netdev  = true;
1108         dev->priv_destructor    = vlan_dev_free;
1109         dev->ethtool_ops        = &vlan_ethtool_ops;
1110
1111 #if IS_ENABLED(CONFIG_MACSEC)
1112         dev->macsec_ops         = &macsec_offload_ops;
1113 #endif
1114         dev->min_mtu            = 0;
1115         dev->max_mtu            = ETH_MAX_MTU;
1116
1117         eth_zero_addr(dev->broadcast);
1118 }