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 <[email protected]>
   7  *              Please send support related email to: [email protected]
   8  *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
   9  *
  10  * Fixes:       Mar 22 2001: Martin Bokaemper <[email protected]>
  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         WRITE_ONCE(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_hwtstamp_get(struct net_device *dev,
 358                              struct kernel_hwtstamp_config *cfg)
 359 {
 360         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 361
 362         return generic_hwtstamp_get_lower(real_dev, cfg);
 363 }
 364
 365 static int vlan_hwtstamp_set(struct net_device *dev,
 366                              struct kernel_hwtstamp_config *cfg,
 367                              struct netlink_ext_ack *extack)
 368 {
 369         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 370
 371         if (!net_eq(dev_net(dev), dev_net(real_dev)))
 372                 return -EOPNOTSUPP;
 373
 374         return generic_hwtstamp_set_lower(real_dev, cfg, extack);
 375 }
 376
 377 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 378 {
 379         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 380         const struct net_device_ops *ops = real_dev->netdev_ops;
 381         struct ifreq ifrr;
 382         int err = -EOPNOTSUPP;
 383
 384         strscpy_pad(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 385         ifrr.ifr_ifru = ifr->ifr_ifru;
 386
 387         switch (cmd) {
 388         case SIOCGMIIPHY:
 389         case SIOCGMIIREG:
 390         case SIOCSMIIREG:
 391                 if (netif_device_present(real_dev) && ops->ndo_eth_ioctl)
 392                         err = ops->ndo_eth_ioctl(real_dev, &ifrr, cmd);
 393                 break;
 394         }
 395
 396         if (!err)
 397                 ifr->ifr_ifru = ifrr.ifr_ifru;
 398
 399         return err;
 400 }
 401
 402 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
 403 {
 404         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 405         const struct net_device_ops *ops = real_dev->netdev_ops;
 406         int err = 0;
 407
 408         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
 409                 err = ops->ndo_neigh_setup(real_dev, pa);
 410
 411         return err;
 412 }
 413
 414 #if IS_ENABLED(CONFIG_FCOE)
 415 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
 416                                    struct scatterlist *sgl, unsigned int sgc)
 417 {
 418         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 419         const struct net_device_ops *ops = real_dev->netdev_ops;
 420         int rc = 0;
 421
 422         if (ops->ndo_fcoe_ddp_setup)
 423                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
 424
 425         return rc;
 426 }
 427
 428 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
 429 {
 430         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 431         const struct net_device_ops *ops = real_dev->netdev_ops;
 432         int len = 0;
 433
 434         if (ops->ndo_fcoe_ddp_done)
 435                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
 436
 437         return len;
 438 }
 439
 440 static int vlan_dev_fcoe_enable(struct net_device *dev)
 441 {
 442         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 443         const struct net_device_ops *ops = real_dev->netdev_ops;
 444         int rc = -EINVAL;
 445
 446         if (ops->ndo_fcoe_enable)
 447                 rc = ops->ndo_fcoe_enable(real_dev);
 448         return rc;
 449 }
 450
 451 static int vlan_dev_fcoe_disable(struct net_device *dev)
 452 {
 453         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 454         const struct net_device_ops *ops = real_dev->netdev_ops;
 455         int rc = -EINVAL;
 456
 457         if (ops->ndo_fcoe_disable)
 458                 rc = ops->ndo_fcoe_disable(real_dev);
 459         return rc;
 460 }
 461
 462 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
 463                                     struct scatterlist *sgl, unsigned int sgc)
 464 {
 465         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 466         const struct net_device_ops *ops = real_dev->netdev_ops;
 467         int rc = 0;
 468
 469         if (ops->ndo_fcoe_ddp_target)
 470                 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
 471
 472         return rc;
 473 }
 474 #endif
 475
 476 #ifdef NETDEV_FCOE_WWNN
 477 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
 478 {
 479         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 480         const struct net_device_ops *ops = real_dev->netdev_ops;
 481         int rc = -EINVAL;
 482
 483         if (ops->ndo_fcoe_get_wwn)
 484                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
 485         return rc;
 486 }
 487 #endif
 488
 489 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 490 {
 491         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 492
 493         if (dev->flags & IFF_UP) {
 494                 if (change & IFF_ALLMULTI)
 495                         dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 496                 if (change & IFF_PROMISC)
 497                         dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 498         }
 499 }
 500
 501 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 502 {
 503         dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 504         dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 505 }
 506
 507 static __be16 vlan_parse_protocol(const struct sk_buff *skb)
 508 {
 509         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 510
 511         return __vlan_get_protocol(skb, veth->h_vlan_proto, NULL);
 512 }
 513
 514 static const struct header_ops vlan_header_ops = {
 515         .create  = vlan_dev_hard_header,
 516         .parse   = eth_header_parse,
 517         .parse_protocol = vlan_parse_protocol,
 518 };
 519
 520 static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
 521                                      unsigned short type,
 522                                      const void *daddr, const void *saddr,
 523                                      unsigned int len)
 524 {
 525         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 526         struct net_device *real_dev = vlan->real_dev;
 527
 528         if (saddr == NULL)
 529                 saddr = dev->dev_addr;
 530
 531         return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
 532 }
 533
 534 static const struct header_ops vlan_passthru_header_ops = {
 535         .create  = vlan_passthru_hard_header,
 536         .parse   = eth_header_parse,
 537         .parse_protocol = vlan_parse_protocol,
 538 };
 539
 540 static const struct device_type vlan_type = {
 541         .name   = "vlan",
 542 };
 543
 544 static const struct net_device_ops vlan_netdev_ops;
 545
 546 static int vlan_dev_init(struct net_device *dev)
 547 {
 548         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 549         struct net_device *real_dev = vlan->real_dev;
 550
 551         netif_carrier_off(dev);
 552
 553         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 554         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
 555                                           IFF_MASTER | IFF_SLAVE);
 556         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 557                                           (1<<__LINK_STATE_DORMANT))) |
 558                       (1<<__LINK_STATE_PRESENT);
 559
 560         if (vlan->flags & VLAN_FLAG_BRIDGE_BINDING)
 561                 dev->state |= (1 << __LINK_STATE_NOCARRIER);
 562
 563         dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG |
 564                            NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
 565                            NETIF_F_GSO_ENCAP_ALL |
 566                            NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC |
 567                            NETIF_F_FCOE_CRC | NETIF_F_FSO;
 568
 569         if (real_dev->vlan_features & NETIF_F_HW_MACSEC)
 570                 dev->hw_features |= NETIF_F_HW_MACSEC;
 571
 572         dev->features |= dev->hw_features;
 573         dev->lltx = true;
 574         dev->fcoe_mtu = true;
 575         netif_inherit_tso_max(dev, real_dev);
 576         if (dev->features & NETIF_F_VLAN_FEATURES)
 577                 netdev_warn(real_dev, "VLAN features are set incorrectly.  Q-in-Q configurations may not work correctly.\n");
 578
 579         dev->vlan_features = real_dev->vlan_features &
 580                              ~(NETIF_F_FCOE_CRC | NETIF_F_FSO);
 581         dev->hw_enc_features = vlan_tnl_features(real_dev);
 582         dev->mpls_features = real_dev->mpls_features;
 583
 584         /* ipv6 shared card related stuff */
 585         dev->dev_id = real_dev->dev_id;
 586
 587         if (is_zero_ether_addr(dev->dev_addr)) {
 588                 eth_hw_addr_set(dev, real_dev->dev_addr);
 589                 dev->addr_assign_type = NET_ADDR_STOLEN;
 590         }
 591         if (is_zero_ether_addr(dev->broadcast))
 592                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 593
 594 #if IS_ENABLED(CONFIG_FCOE)
 595         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
 596 #endif
 597
 598         dev->needed_headroom = real_dev->needed_headroom;
 599         if (vlan_hw_offload_capable(real_dev->features, vlan->vlan_proto)) {
 600                 dev->header_ops      = &vlan_passthru_header_ops;
 601                 dev->hard_header_len = real_dev->hard_header_len;
 602         } else {
 603                 dev->header_ops      = &vlan_header_ops;
 604                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 605         }
 606
 607         dev->netdev_ops = &vlan_netdev_ops;
 608
 609         SET_NETDEV_DEVTYPE(dev, &vlan_type);
 610
 611         netdev_lockdep_set_classes(dev);
 612
 613         vlan->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 614         if (!vlan->vlan_pcpu_stats)
 615                 return -ENOMEM;
 616
 617         /* Get vlan's reference to real_dev */
 618         netdev_hold(real_dev, &vlan->dev_tracker, GFP_KERNEL);
 619
 620         return 0;
 621 }
 622
 623 /* Note: this function might be called multiple times for the same device. */
 624 void vlan_dev_free_egress_priority(const struct net_device *dev)
 625 {
 626         struct vlan_priority_tci_mapping *pm;
 627         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 628         int i;
 629
 630         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 631                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 632                         vlan->egress_priority_map[i] = pm->next;
 633                         kfree(pm);
 634                 }
 635         }
 636 }
 637
 638 static void vlan_dev_uninit(struct net_device *dev)
 639 {
 640         vlan_dev_free_egress_priority(dev);
 641 }
 642
 643 static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
 644         netdev_features_t features)
 645 {
 646         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 647         netdev_features_t old_features = features;
 648         netdev_features_t lower_features;
 649
 650         lower_features = netdev_intersect_features((real_dev->vlan_features |
 651                                                     NETIF_F_RXCSUM),
 652                                                    real_dev->features);
 653
 654         /* Add HW_CSUM setting to preserve user ability to control
 655          * checksum offload on the vlan device.
 656          */
 657         if (lower_features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
 658                 lower_features |= NETIF_F_HW_CSUM;
 659         features = netdev_intersect_features(features, lower_features);
 660         features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE);
 661
 662         return features;
 663 }
 664
 665 static int vlan_ethtool_get_link_ksettings(struct net_device *dev,
 666                                            struct ethtool_link_ksettings *cmd)
 667 {
 668         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 669
 670         return __ethtool_get_link_ksettings(vlan->real_dev, cmd);
 671 }
 672
 673 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
 674                                      struct ethtool_drvinfo *info)
 675 {
 676         strscpy(info->driver, vlan_fullname, sizeof(info->driver));
 677         strscpy(info->version, vlan_version, sizeof(info->version));
 678         strscpy(info->fw_version, "N/A", sizeof(info->fw_version));
 679 }
 680
 681 static int vlan_ethtool_get_ts_info(struct net_device *dev,
 682                                     struct kernel_ethtool_ts_info *info)
 683 {
 684         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 685         return ethtool_get_ts_info_by_layer(vlan->real_dev, info);
 686 }
 687
 688 static void vlan_dev_get_stats64(struct net_device *dev,
 689                                  struct rtnl_link_stats64 *stats)
 690 {
 691         struct vlan_pcpu_stats *p;
 692         u32 rx_errors = 0, tx_dropped = 0;
 693         int i;
 694
 695         for_each_possible_cpu(i) {
 696                 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
 697                 unsigned int start;
 698
 699                 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
 700                 do {
 701                         start = u64_stats_fetch_begin(&p->syncp);
 702                         rxpackets       = u64_stats_read(&p->rx_packets);
 703                         rxbytes         = u64_stats_read(&p->rx_bytes);
 704                         rxmulticast     = u64_stats_read(&p->rx_multicast);
 705                         txpackets       = u64_stats_read(&p->tx_packets);
 706                         txbytes         = u64_stats_read(&p->tx_bytes);
 707                 } while (u64_stats_fetch_retry(&p->syncp, start));
 708
 709                 stats->rx_packets       += rxpackets;
 710                 stats->rx_bytes         += rxbytes;
 711                 stats->multicast        += rxmulticast;
 712                 stats->tx_packets       += txpackets;
 713                 stats->tx_bytes         += txbytes;
 714                 /* rx_errors & tx_dropped are u32 */
 715                 rx_errors       += READ_ONCE(p->rx_errors);
 716                 tx_dropped      += READ_ONCE(p->tx_dropped);
 717         }
 718         stats->rx_errors  = rx_errors;
 719         stats->tx_dropped = tx_dropped;
 720 }
 721
 722 #ifdef CONFIG_NET_POLL_CONTROLLER
 723 static void vlan_dev_poll_controller(struct net_device *dev)
 724 {
 725         return;
 726 }
 727
 728 static int vlan_dev_netpoll_setup(struct net_device *dev)
 729 {
 730         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 731         struct net_device *real_dev = vlan->real_dev;
 732         struct netpoll *netpoll;
 733         int err = 0;
 734
 735         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 736         err = -ENOMEM;
 737         if (!netpoll)
 738                 goto out;
 739
 740         err = __netpoll_setup(netpoll, real_dev);
 741         if (err) {
 742                 kfree(netpoll);
 743                 goto out;
 744         }
 745
 746         vlan->netpoll = netpoll;
 747
 748 out:
 749         return err;
 750 }
 751
 752 static void vlan_dev_netpoll_cleanup(struct net_device *dev)
 753 {
 754         struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
 755         struct netpoll *netpoll = vlan->netpoll;
 756
 757         if (!netpoll)
 758                 return;
 759
 760         vlan->netpoll = NULL;
 761         __netpoll_free(netpoll);
 762 }
 763 #endif /* CONFIG_NET_POLL_CONTROLLER */
 764
 765 static int vlan_dev_get_iflink(const struct net_device *dev)
 766 {
 767         const struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 768
 769         return READ_ONCE(real_dev->ifindex);
 770 }
 771
 772 static int vlan_dev_fill_forward_path(struct net_device_path_ctx *ctx,
 773                                       struct net_device_path *path)
 774 {
 775         struct vlan_dev_priv *vlan = vlan_dev_priv(ctx->dev);
 776
 777         path->type = DEV_PATH_VLAN;
 778         path->encap.id = vlan->vlan_id;
 779         path->encap.proto = vlan->vlan_proto;
 780         path->dev = ctx->dev;
 781         ctx->dev = vlan->real_dev;
 782         if (ctx->num_vlans >= ARRAY_SIZE(ctx->vlan))
 783                 return -ENOSPC;
 784
 785         ctx->vlan[ctx->num_vlans].id = vlan->vlan_id;
 786         ctx->vlan[ctx->num_vlans].proto = vlan->vlan_proto;
 787         ctx->num_vlans++;
 788
 789         return 0;
 790 }
 791
 792 #if IS_ENABLED(CONFIG_MACSEC)
 793
 794 static const struct macsec_ops *vlan_get_macsec_ops(const struct macsec_context *ctx)
 795 {
 796         return vlan_dev_priv(ctx->netdev)->real_dev->macsec_ops;
 797 }
 798
 799 static int vlan_macsec_offload(int (* const func)(struct macsec_context *),
 800                                struct macsec_context *ctx)
 801 {
 802         if (unlikely(!func))
 803                 return 0;
 804
 805         return (*func)(ctx);
 806 }
 807
 808 static int vlan_macsec_dev_open(struct macsec_context *ctx)
 809 {
 810         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 811
 812         if (!ops)
 813                 return -EOPNOTSUPP;
 814
 815         return vlan_macsec_offload(ops->mdo_dev_open, ctx);
 816 }
 817
 818 static int vlan_macsec_dev_stop(struct macsec_context *ctx)
 819 {
 820         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 821
 822         if (!ops)
 823                 return -EOPNOTSUPP;
 824
 825         return vlan_macsec_offload(ops->mdo_dev_stop, ctx);
 826 }
 827
 828 static int vlan_macsec_add_secy(struct macsec_context *ctx)
 829 {
 830         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 831
 832         if (!ops)
 833                 return -EOPNOTSUPP;
 834
 835         return vlan_macsec_offload(ops->mdo_add_secy, ctx);
 836 }
 837
 838 static int vlan_macsec_upd_secy(struct macsec_context *ctx)
 839 {
 840         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 841
 842         if (!ops)
 843                 return -EOPNOTSUPP;
 844
 845         return vlan_macsec_offload(ops->mdo_upd_secy, ctx);
 846 }
 847
 848 static int vlan_macsec_del_secy(struct macsec_context *ctx)
 849 {
 850         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 851
 852         if (!ops)
 853                 return -EOPNOTSUPP;
 854
 855         return vlan_macsec_offload(ops->mdo_del_secy, ctx);
 856 }
 857
 858 static int vlan_macsec_add_rxsc(struct macsec_context *ctx)
 859 {
 860         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 861
 862         if (!ops)
 863                 return -EOPNOTSUPP;
 864
 865         return vlan_macsec_offload(ops->mdo_add_rxsc, ctx);
 866 }
 867
 868 static int vlan_macsec_upd_rxsc(struct macsec_context *ctx)
 869 {
 870         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 871
 872         if (!ops)
 873                 return -EOPNOTSUPP;
 874
 875         return vlan_macsec_offload(ops->mdo_upd_rxsc, ctx);
 876 }
 877
 878 static int vlan_macsec_del_rxsc(struct macsec_context *ctx)
 879 {
 880         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 881
 882         if (!ops)
 883                 return -EOPNOTSUPP;
 884
 885         return vlan_macsec_offload(ops->mdo_del_rxsc, ctx);
 886 }
 887
 888 static int vlan_macsec_add_rxsa(struct macsec_context *ctx)
 889 {
 890         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 891
 892         if (!ops)
 893                 return -EOPNOTSUPP;
 894
 895         return vlan_macsec_offload(ops->mdo_add_rxsa, ctx);
 896 }
 897
 898 static int vlan_macsec_upd_rxsa(struct macsec_context *ctx)
 899 {
 900         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 901
 902         if (!ops)
 903                 return -EOPNOTSUPP;
 904
 905         return vlan_macsec_offload(ops->mdo_upd_rxsa, ctx);
 906 }
 907
 908 static int vlan_macsec_del_rxsa(struct macsec_context *ctx)
 909 {
 910         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 911
 912         if (!ops)
 913                 return -EOPNOTSUPP;
 914
 915         return vlan_macsec_offload(ops->mdo_del_rxsa, ctx);
 916 }
 917
 918 static int vlan_macsec_add_txsa(struct macsec_context *ctx)
 919 {
 920         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 921
 922         if (!ops)
 923                 return -EOPNOTSUPP;
 924
 925         return vlan_macsec_offload(ops->mdo_add_txsa, ctx);
 926 }
 927
 928 static int vlan_macsec_upd_txsa(struct macsec_context *ctx)
 929 {
 930         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 931
 932         if (!ops)
 933                 return -EOPNOTSUPP;
 934
 935         return vlan_macsec_offload(ops->mdo_upd_txsa, ctx);
 936 }
 937
 938 static int vlan_macsec_del_txsa(struct macsec_context *ctx)
 939 {
 940         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 941
 942         if (!ops)
 943                 return -EOPNOTSUPP;
 944
 945         return vlan_macsec_offload(ops->mdo_del_txsa, ctx);
 946 }
 947
 948 static int vlan_macsec_get_dev_stats(struct macsec_context *ctx)
 949 {
 950         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 951
 952         if (!ops)
 953                 return -EOPNOTSUPP;
 954
 955         return vlan_macsec_offload(ops->mdo_get_dev_stats, ctx);
 956 }
 957
 958 static int vlan_macsec_get_tx_sc_stats(struct macsec_context *ctx)
 959 {
 960         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 961
 962         if (!ops)
 963                 return -EOPNOTSUPP;
 964
 965         return vlan_macsec_offload(ops->mdo_get_tx_sc_stats, ctx);
 966 }
 967
 968 static int vlan_macsec_get_tx_sa_stats(struct macsec_context *ctx)
 969 {
 970         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 971
 972         if (!ops)
 973                 return -EOPNOTSUPP;
 974
 975         return vlan_macsec_offload(ops->mdo_get_tx_sa_stats, ctx);
 976 }
 977
 978 static int vlan_macsec_get_rx_sc_stats(struct macsec_context *ctx)
 979 {
 980         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 981
 982         if (!ops)
 983                 return -EOPNOTSUPP;
 984
 985         return vlan_macsec_offload(ops->mdo_get_rx_sc_stats, ctx);
 986 }
 987
 988 static int vlan_macsec_get_rx_sa_stats(struct macsec_context *ctx)
 989 {
 990         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 991
 992         if (!ops)
 993                 return -EOPNOTSUPP;
 994
 995         return vlan_macsec_offload(ops->mdo_get_rx_sa_stats, ctx);
 996 }
 997
 998 static const struct macsec_ops macsec_offload_ops = {
 999         /* Device wide */
1000         .mdo_dev_open = vlan_macsec_dev_open,
1001         .mdo_dev_stop = vlan_macsec_dev_stop,
1002         /* SecY */
1003         .mdo_add_secy = vlan_macsec_add_secy,
1004         .mdo_upd_secy = vlan_macsec_upd_secy,
1005         .mdo_del_secy = vlan_macsec_del_secy,
1006         /* Security channels */
1007         .mdo_add_rxsc = vlan_macsec_add_rxsc,
1008         .mdo_upd_rxsc = vlan_macsec_upd_rxsc,
1009         .mdo_del_rxsc = vlan_macsec_del_rxsc,
1010         /* Security associations */
1011         .mdo_add_rxsa = vlan_macsec_add_rxsa,
1012         .mdo_upd_rxsa = vlan_macsec_upd_rxsa,
1013         .mdo_del_rxsa = vlan_macsec_del_rxsa,
1014         .mdo_add_txsa = vlan_macsec_add_txsa,
1015         .mdo_upd_txsa = vlan_macsec_upd_txsa,
1016         .mdo_del_txsa = vlan_macsec_del_txsa,
1017         /* Statistics */
1018         .mdo_get_dev_stats = vlan_macsec_get_dev_stats,
1019         .mdo_get_tx_sc_stats = vlan_macsec_get_tx_sc_stats,
1020         .mdo_get_tx_sa_stats = vlan_macsec_get_tx_sa_stats,
1021         .mdo_get_rx_sc_stats = vlan_macsec_get_rx_sc_stats,
1022         .mdo_get_rx_sa_stats = vlan_macsec_get_rx_sa_stats,
1023 };
1024
1025 #endif
1026
1027 static const struct ethtool_ops vlan_ethtool_ops = {
1028         .get_link_ksettings     = vlan_ethtool_get_link_ksettings,
1029         .get_drvinfo            = vlan_ethtool_get_drvinfo,
1030         .get_link               = ethtool_op_get_link,
1031         .get_ts_info            = vlan_ethtool_get_ts_info,
1032 };
1033
1034 static const struct net_device_ops vlan_netdev_ops = {
1035         .ndo_change_mtu         = vlan_dev_change_mtu,
1036         .ndo_init               = vlan_dev_init,
1037         .ndo_uninit             = vlan_dev_uninit,
1038         .ndo_open               = vlan_dev_open,
1039         .ndo_stop               = vlan_dev_stop,
1040         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
1041         .ndo_validate_addr      = eth_validate_addr,
1042         .ndo_set_mac_address    = vlan_dev_set_mac_address,
1043         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
1044         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
1045         .ndo_eth_ioctl          = vlan_dev_ioctl,
1046         .ndo_neigh_setup        = vlan_dev_neigh_setup,
1047         .ndo_get_stats64        = vlan_dev_get_stats64,
1048 #if IS_ENABLED(CONFIG_FCOE)
1049         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
1050         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
1051         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
1052         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
1053         .ndo_fcoe_ddp_target    = vlan_dev_fcoe_ddp_target,
1054 #endif
1055 #ifdef NETDEV_FCOE_WWNN
1056         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
1057 #endif
1058 #ifdef CONFIG_NET_POLL_CONTROLLER
1059         .ndo_poll_controller    = vlan_dev_poll_controller,
1060         .ndo_netpoll_setup      = vlan_dev_netpoll_setup,
1061         .ndo_netpoll_cleanup    = vlan_dev_netpoll_cleanup,
1062 #endif
1063         .ndo_fix_features       = vlan_dev_fix_features,
1064         .ndo_get_iflink         = vlan_dev_get_iflink,
1065         .ndo_fill_forward_path  = vlan_dev_fill_forward_path,
1066         .ndo_hwtstamp_get       = vlan_hwtstamp_get,
1067         .ndo_hwtstamp_set       = vlan_hwtstamp_set,
1068 };
1069
1070 static void vlan_dev_free(struct net_device *dev)
1071 {
1072         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
1073
1074         free_percpu(vlan->vlan_pcpu_stats);
1075         vlan->vlan_pcpu_stats = NULL;
1076
1077         /* Get rid of the vlan's reference to real_dev */
1078         netdev_put(vlan->real_dev, &vlan->dev_tracker);
1079 }
1080
1081 void vlan_setup(struct net_device *dev)
1082 {
1083         ether_setup(dev);
1084
1085         dev->priv_flags         |= IFF_802_1Q_VLAN | IFF_NO_QUEUE;
1086         dev->priv_flags         |= IFF_UNICAST_FLT;
1087         dev->priv_flags         &= ~IFF_TX_SKB_SHARING;
1088         netif_keep_dst(dev);
1089
1090         dev->netdev_ops         = &vlan_netdev_ops;
1091         dev->needs_free_netdev  = true;
1092         dev->priv_destructor    = vlan_dev_free;
1093         dev->ethtool_ops        = &vlan_ethtool_ops;
1094
1095 #if IS_ENABLED(CONFIG_MACSEC)
1096         dev->macsec_ops         = &macsec_offload_ops;
1097 #endif
1098         dev->min_mtu            = 0;
1099         dev->max_mtu            = ETH_MAX_MTU;
1100
1101         eth_zero_addr(dev->broadcast);
1102 }