net/bridge/br_vlan.c

   1 #include <linux/kernel.h>
   2 #include <linux/netdevice.h>
   3 #include <linux/rtnetlink.h>
   4 #include <linux/slab.h>
   5 #include <net/switchdev.h>
   6
   7 #include "br_private.h"
   8
   9 static void __vlan_add_pvid(struct net_port_vlans *v, u16 vid)
  10 {
  11         if (v->pvid == vid)
  12                 return;
  13
  14         smp_wmb();
  15         v->pvid = vid;
  16 }
  17
  18 static void __vlan_delete_pvid(struct net_port_vlans *v, u16 vid)
  19 {
  20         if (v->pvid != vid)
  21                 return;
  22
  23         smp_wmb();
  24         v->pvid = 0;
  25 }
  26
  27 static void __vlan_add_flags(struct net_port_vlans *v, u16 vid, u16 flags)
  28 {
  29         if (flags & BRIDGE_VLAN_INFO_PVID)
  30                 __vlan_add_pvid(v, vid);
  31         else
  32                 __vlan_delete_pvid(v, vid);
  33
  34         if (flags & BRIDGE_VLAN_INFO_UNTAGGED)
  35                 set_bit(vid, v->untagged_bitmap);
  36         else
  37                 clear_bit(vid, v->untagged_bitmap);
  38 }
  39
  40 static int __vlan_vid_add(struct net_device *dev, struct net_bridge *br,
  41                           u16 vid, u16 flags)
  42 {
  43         const struct net_device_ops *ops = dev->netdev_ops;
  44         int err;
  45
  46         /* If driver uses VLAN ndo ops, use 8021q to install vid
  47          * on device, otherwise try switchdev ops to install vid.
  48          */
  49
  50         if (ops->ndo_vlan_rx_add_vid) {
  51                 err = vlan_vid_add(dev, br->vlan_proto, vid);
  52         } else {
  53                 struct switchdev_obj vlan_obj = {
  54                         .id = SWITCHDEV_OBJ_PORT_VLAN,
  55                         .u.vlan = {
  56                                 .flags = flags,
  57                                 .vid_begin = vid,
  58                                 .vid_end = vid,
  59                         },
  60                 };
  61
  62                 err = switchdev_port_obj_add(dev, &vlan_obj);
  63                 if (err == -EOPNOTSUPP)
  64                         err = 0;
  65         }
  66
  67         return err;
  68 }
  69
  70 static int __vlan_add(struct net_port_vlans *v, u16 vid, u16 flags)
  71 {
  72         struct net_bridge_port *p = NULL;
  73         struct net_bridge *br;
  74         struct net_device *dev;
  75         int err;
  76
  77         if (test_bit(vid, v->vlan_bitmap)) {
  78                 __vlan_add_flags(v, vid, flags);
  79                 return 0;
  80         }
  81
  82         if (v->port_idx) {
  83                 p = v->parent.port;
  84                 br = p->br;
  85                 dev = p->dev;
  86         } else {
  87                 br = v->parent.br;
  88                 dev = br->dev;
  89         }
  90
  91         if (p) {
  92                 /* Add VLAN to the device filter if it is supported.
  93                  * This ensures tagged traffic enters the bridge when
  94                  * promiscuous mode is disabled by br_manage_promisc().
  95                  */
  96                 err = __vlan_vid_add(dev, br, vid, flags);
  97                 if (err)
  98                         return err;
  99         }
 100
 101         err = br_fdb_insert(br, p, dev->dev_addr, vid);
 102         if (err) {
 103                 br_err(br, "failed insert local address into bridge "
 104                        "forwarding table\n");
 105                 goto out_filt;
 106         }
 107
 108         set_bit(vid, v->vlan_bitmap);
 109         v->num_vlans++;
 110         __vlan_add_flags(v, vid, flags);
 111
 112         return 0;
 113
 114 out_filt:
 115         if (p)
 116                 vlan_vid_del(dev, br->vlan_proto, vid);
 117         return err;
 118 }
 119
 120 static int __vlan_vid_del(struct net_device *dev, struct net_bridge *br,
 121                           u16 vid)
 122 {
 123         const struct net_device_ops *ops = dev->netdev_ops;
 124         int err = 0;
 125
 126         /* If driver uses VLAN ndo ops, use 8021q to delete vid
 127          * on device, otherwise try switchdev ops to delete vid.
 128          */
 129
 130         if (ops->ndo_vlan_rx_kill_vid) {
 131                 vlan_vid_del(dev, br->vlan_proto, vid);
 132         } else {
 133                 struct switchdev_obj vlan_obj = {
 134                         .id = SWITCHDEV_OBJ_PORT_VLAN,
 135                         .u.vlan = {
 136                                 .vid_begin = vid,
 137                                 .vid_end = vid,
 138                         },
 139                 };
 140
 141                 err = switchdev_port_obj_del(dev, &vlan_obj);
 142                 if (err == -EOPNOTSUPP)
 143                         err = 0;
 144         }
 145
 146         return err;
 147 }
 148
 149 static int __vlan_del(struct net_port_vlans *v, u16 vid)
 150 {
 151         if (!test_bit(vid, v->vlan_bitmap))
 152                 return -EINVAL;
 153
 154         __vlan_delete_pvid(v, vid);
 155         clear_bit(vid, v->untagged_bitmap);
 156
 157         if (v->port_idx) {
 158                 struct net_bridge_port *p = v->parent.port;
 159                 int err;
 160
 161                 err = __vlan_vid_del(p->dev, p->br, vid);
 162                 if (err)
 163                         return err;
 164         }
 165
 166         clear_bit(vid, v->vlan_bitmap);
 167         v->num_vlans--;
 168         if (bitmap_empty(v->vlan_bitmap, VLAN_N_VID)) {
 169                 if (v->port_idx)
 170                         RCU_INIT_POINTER(v->parent.port->vlan_info, NULL);
 171                 else
 172                         RCU_INIT_POINTER(v->parent.br->vlan_info, NULL);
 173                 kfree_rcu(v, rcu);
 174         }
 175         return 0;
 176 }
 177
 178 static void __vlan_flush(struct net_port_vlans *v)
 179 {
 180         smp_wmb();
 181         v->pvid = 0;
 182         bitmap_zero(v->vlan_bitmap, VLAN_N_VID);
 183         if (v->port_idx)
 184                 RCU_INIT_POINTER(v->parent.port->vlan_info, NULL);
 185         else
 186                 RCU_INIT_POINTER(v->parent.br->vlan_info, NULL);
 187         kfree_rcu(v, rcu);
 188 }
 189
 190 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 191                                const struct net_port_vlans *pv,
 192                                struct sk_buff *skb)
 193 {
 194         u16 vid;
 195
 196         /* If this packet was not filtered at input, let it pass */
 197         if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
 198                 goto out;
 199
 200         /* Vlan filter table must be configured at this point.  The
 201          * only exception is the bridge is set in promisc mode and the
 202          * packet is destined for the bridge device.  In this case
 203          * pass the packet as is.
 204          */
 205         if (!pv) {
 206                 if ((br->dev->flags & IFF_PROMISC) && skb->dev == br->dev) {
 207                         goto out;
 208                 } else {
 209                         kfree_skb(skb);
 210                         return NULL;
 211                 }
 212         }
 213
 214         /* At this point, we know that the frame was filtered and contains
 215          * a valid vlan id.  If the vlan id is set in the untagged bitmap,
 216          * send untagged; otherwise, send tagged.
 217          */
 218         br_vlan_get_tag(skb, &vid);
 219         if (test_bit(vid, pv->untagged_bitmap))
 220                 skb->vlan_tci = 0;
 221
 222 out:
 223         return skb;
 224 }
 225
 226 /* Called under RCU */
 227 bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
 228                         struct sk_buff *skb, u16 *vid)
 229 {
 230         bool tagged;
 231         __be16 proto;
 232
 233         /* If VLAN filtering is disabled on the bridge, all packets are
 234          * permitted.
 235          */
 236         if (!br->vlan_enabled) {
 237                 BR_INPUT_SKB_CB(skb)->vlan_filtered = false;
 238                 return true;
 239         }
 240
 241         /* If there are no vlan in the permitted list, all packets are
 242          * rejected.
 243          */
 244         if (!v)
 245                 goto drop;
 246
 247         BR_INPUT_SKB_CB(skb)->vlan_filtered = true;
 248         proto = br->vlan_proto;
 249
 250         /* If vlan tx offload is disabled on bridge device and frame was
 251          * sent from vlan device on the bridge device, it does not have
 252          * HW accelerated vlan tag.
 253          */
 254         if (unlikely(!skb_vlan_tag_present(skb) &&
 255                      skb->protocol == proto)) {
 256                 skb = skb_vlan_untag(skb);
 257                 if (unlikely(!skb))
 258                         return false;
 259         }
 260
 261         if (!br_vlan_get_tag(skb, vid)) {
 262                 /* Tagged frame */
 263                 if (skb->vlan_proto != proto) {
 264                         /* Protocol-mismatch, empty out vlan_tci for new tag */
 265                         skb_push(skb, ETH_HLEN);
 266                         skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto,
 267                                                         skb_vlan_tag_get(skb));
 268                         if (unlikely(!skb))
 269                                 return false;
 270
 271                         skb_pull(skb, ETH_HLEN);
 272                         skb_reset_mac_len(skb);
 273                         *vid = 0;
 274                         tagged = false;
 275                 } else {
 276                         tagged = true;
 277                 }
 278         } else {
 279                 /* Untagged frame */
 280                 tagged = false;
 281         }
 282
 283         if (!*vid) {
 284                 u16 pvid = br_get_pvid(v);
 285
 286                 /* Frame had a tag with VID 0 or did not have a tag.
 287                  * See if pvid is set on this port.  That tells us which
 288                  * vlan untagged or priority-tagged traffic belongs to.
 289                  */
 290                 if (!pvid)
 291                         goto drop;
 292
 293                 /* PVID is set on this port.  Any untagged or priority-tagged
 294                  * ingress frame is considered to belong to this vlan.
 295                  */
 296                 *vid = pvid;
 297                 if (likely(!tagged))
 298                         /* Untagged Frame. */
 299                         __vlan_hwaccel_put_tag(skb, proto, pvid);
 300                 else
 301                         /* Priority-tagged Frame.
 302                          * At this point, We know that skb->vlan_tci had
 303                          * VLAN_TAG_PRESENT bit and its VID field was 0x000.
 304                          * We update only VID field and preserve PCP field.
 305                          */
 306                         skb->vlan_tci |= pvid;
 307
 308                 return true;
 309         }
 310
 311         /* Frame had a valid vlan tag.  See if vlan is allowed */
 312         if (test_bit(*vid, v->vlan_bitmap))
 313                 return true;
 314 drop:
 315         kfree_skb(skb);
 316         return false;
 317 }
 318
 319 /* Called under RCU. */
 320 bool br_allowed_egress(struct net_bridge *br,
 321                        const struct net_port_vlans *v,
 322                        const struct sk_buff *skb)
 323 {
 324         u16 vid;
 325
 326         /* If this packet was not filtered at input, let it pass */
 327         if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
 328                 return true;
 329
 330         if (!v)
 331                 return false;
 332
 333         br_vlan_get_tag(skb, &vid);
 334         if (test_bit(vid, v->vlan_bitmap))
 335                 return true;
 336
 337         return false;
 338 }
 339
 340 /* Called under RCU */
 341 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid)
 342 {
 343         struct net_bridge *br = p->br;
 344         struct net_port_vlans *v;
 345
 346         /* If filtering was disabled at input, let it pass. */
 347         if (!br->vlan_enabled)
 348                 return true;
 349
 350         v = rcu_dereference(p->vlan_info);
 351         if (!v)
 352                 return false;
 353
 354         if (!br_vlan_get_tag(skb, vid) && skb->vlan_proto != br->vlan_proto)
 355                 *vid = 0;
 356
 357         if (!*vid) {
 358                 *vid = br_get_pvid(v);
 359                 if (!*vid)
 360                         return false;
 361
 362                 return true;
 363         }
 364
 365         if (test_bit(*vid, v->vlan_bitmap))
 366                 return true;
 367
 368         return false;
 369 }
 370
 371 /* Must be protected by RTNL.
 372  * Must be called with vid in range from 1 to 4094 inclusive.
 373  */
 374 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 375 {
 376         struct net_port_vlans *pv = NULL;
 377         int err;
 378
 379         ASSERT_RTNL();
 380
 381         pv = rtnl_dereference(br->vlan_info);
 382         if (pv)
 383                 return __vlan_add(pv, vid, flags);
 384
 385         /* Create port vlan infomration
 386          */
 387         pv = kzalloc(sizeof(*pv), GFP_KERNEL);
 388         if (!pv)
 389                 return -ENOMEM;
 390
 391         pv->parent.br = br;
 392         err = __vlan_add(pv, vid, flags);
 393         if (err)
 394                 goto out;
 395
 396         rcu_assign_pointer(br->vlan_info, pv);
 397         return 0;
 398 out:
 399         kfree(pv);
 400         return err;
 401 }
 402
 403 /* Must be protected by RTNL.
 404  * Must be called with vid in range from 1 to 4094 inclusive.
 405  */
 406 int br_vlan_delete(struct net_bridge *br, u16 vid)
 407 {
 408         struct net_port_vlans *pv;
 409
 410         ASSERT_RTNL();
 411
 412         pv = rtnl_dereference(br->vlan_info);
 413         if (!pv)
 414                 return -EINVAL;
 415
 416         br_fdb_find_delete_local(br, NULL, br->dev->dev_addr, vid);
 417
 418         __vlan_del(pv, vid);
 419         return 0;
 420 }
 421
 422 void br_vlan_flush(struct net_bridge *br)
 423 {
 424         struct net_port_vlans *pv;
 425
 426         ASSERT_RTNL();
 427         pv = rtnl_dereference(br->vlan_info);
 428         if (!pv)
 429                 return;
 430
 431         __vlan_flush(pv);
 432 }
 433
 434 bool br_vlan_find(struct net_bridge *br, u16 vid)
 435 {
 436         struct net_port_vlans *pv;
 437         bool found = false;
 438
 439         rcu_read_lock();
 440         pv = rcu_dereference(br->vlan_info);
 441
 442         if (!pv)
 443                 goto out;
 444
 445         if (test_bit(vid, pv->vlan_bitmap))
 446                 found = true;
 447
 448 out:
 449         rcu_read_unlock();
 450         return found;
 451 }
 452
 453 /* Must be protected by RTNL. */
 454 static void recalculate_group_addr(struct net_bridge *br)
 455 {
 456         if (br->group_addr_set)
 457                 return;
 458
 459         spin_lock_bh(&br->lock);
 460         if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q)) {
 461                 /* Bridge Group Address */
 462                 br->group_addr[5] = 0x00;
 463         } else { /* vlan_enabled && ETH_P_8021AD */
 464                 /* Provider Bridge Group Address */
 465                 br->group_addr[5] = 0x08;
 466         }
 467         spin_unlock_bh(&br->lock);
 468 }
 469
 470 /* Must be protected by RTNL. */
 471 void br_recalculate_fwd_mask(struct net_bridge *br)
 472 {
 473         if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q))
 474                 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
 475         else /* vlan_enabled && ETH_P_8021AD */
 476                 br->group_fwd_mask_required = BR_GROUPFWD_8021AD &
 477                                               ~(1u << br->group_addr[5]);
 478 }
 479
 480 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
 481 {
 482         if (br->vlan_enabled == val)
 483                 return 0;
 484
 485         br->vlan_enabled = val;
 486         br_manage_promisc(br);
 487         recalculate_group_addr(br);
 488         br_recalculate_fwd_mask(br);
 489
 490         return 0;
 491 }
 492
 493 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
 494 {
 495         if (!rtnl_trylock())
 496                 return restart_syscall();
 497
 498         __br_vlan_filter_toggle(br, val);
 499         rtnl_unlock();
 500
 501         return 0;
 502 }
 503
 504 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto)
 505 {
 506         int err = 0;
 507         struct net_bridge_port *p;
 508         struct net_port_vlans *pv;
 509         __be16 oldproto;
 510         u16 vid, errvid;
 511
 512         if (br->vlan_proto == proto)
 513                 return 0;
 514
 515         /* Add VLANs for the new proto to the device filter. */
 516         list_for_each_entry(p, &br->port_list, list) {
 517                 pv = rtnl_dereference(p->vlan_info);
 518                 if (!pv)
 519                         continue;
 520
 521                 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
 522                         err = vlan_vid_add(p->dev, proto, vid);
 523                         if (err)
 524                                 goto err_filt;
 525                 }
 526         }
 527
 528         oldproto = br->vlan_proto;
 529         br->vlan_proto = proto;
 530
 531         recalculate_group_addr(br);
 532         br_recalculate_fwd_mask(br);
 533
 534         /* Delete VLANs for the old proto from the device filter. */
 535         list_for_each_entry(p, &br->port_list, list) {
 536                 pv = rtnl_dereference(p->vlan_info);
 537                 if (!pv)
 538                         continue;
 539
 540                 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID)
 541                         vlan_vid_del(p->dev, oldproto, vid);
 542         }
 543
 544         return 0;
 545
 546 err_filt:
 547         errvid = vid;
 548         for_each_set_bit(vid, pv->vlan_bitmap, errvid)
 549                 vlan_vid_del(p->dev, proto, vid);
 550
 551         list_for_each_entry_continue_reverse(p, &br->port_list, list) {
 552                 pv = rtnl_dereference(p->vlan_info);
 553                 if (!pv)
 554                         continue;
 555
 556                 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID)
 557                         vlan_vid_del(p->dev, proto, vid);
 558         }
 559
 560         return err;
 561 }
 562
 563 int br_vlan_set_proto(struct net_bridge *br, unsigned long val)
 564 {
 565         int err;
 566
 567         if (val != ETH_P_8021Q && val != ETH_P_8021AD)
 568                 return -EPROTONOSUPPORT;
 569
 570         if (!rtnl_trylock())
 571                 return restart_syscall();
 572
 573         err = __br_vlan_set_proto(br, htons(val));
 574         rtnl_unlock();
 575
 576         return err;
 577 }
 578
 579 static bool vlan_default_pvid(struct net_port_vlans *pv, u16 vid)
 580 {
 581         return pv && vid == pv->pvid && test_bit(vid, pv->untagged_bitmap);
 582 }
 583
 584 static void br_vlan_disable_default_pvid(struct net_bridge *br)
 585 {
 586         struct net_bridge_port *p;
 587         u16 pvid = br->default_pvid;
 588
 589         /* Disable default_pvid on all ports where it is still
 590          * configured.
 591          */
 592         if (vlan_default_pvid(br_get_vlan_info(br), pvid))
 593                 br_vlan_delete(br, pvid);
 594
 595         list_for_each_entry(p, &br->port_list, list) {
 596                 if (vlan_default_pvid(nbp_get_vlan_info(p), pvid))
 597                         nbp_vlan_delete(p, pvid);
 598         }
 599
 600         br->default_pvid = 0;
 601 }
 602
 603 static int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid)
 604 {
 605         struct net_bridge_port *p;
 606         u16 old_pvid;
 607         int err = 0;
 608         unsigned long *changed;
 609
 610         changed = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
 611                           GFP_KERNEL);
 612         if (!changed)
 613                 return -ENOMEM;
 614
 615         old_pvid = br->default_pvid;
 616
 617         /* Update default_pvid config only if we do not conflict with
 618          * user configuration.
 619          */
 620         if ((!old_pvid || vlan_default_pvid(br_get_vlan_info(br), old_pvid)) &&
 621             !br_vlan_find(br, pvid)) {
 622                 err = br_vlan_add(br, pvid,
 623                                   BRIDGE_VLAN_INFO_PVID |
 624                                   BRIDGE_VLAN_INFO_UNTAGGED);
 625                 if (err)
 626                         goto out;
 627                 br_vlan_delete(br, old_pvid);
 628                 set_bit(0, changed);
 629         }
 630
 631         list_for_each_entry(p, &br->port_list, list) {
 632                 /* Update default_pvid config only if we do not conflict with
 633                  * user configuration.
 634                  */
 635                 if ((old_pvid &&
 636                      !vlan_default_pvid(nbp_get_vlan_info(p), old_pvid)) ||
 637                     nbp_vlan_find(p, pvid))
 638                         continue;
 639
 640                 err = nbp_vlan_add(p, pvid,
 641                                    BRIDGE_VLAN_INFO_PVID |
 642                                    BRIDGE_VLAN_INFO_UNTAGGED);
 643                 if (err)
 644                         goto err_port;
 645                 nbp_vlan_delete(p, old_pvid);
 646                 set_bit(p->port_no, changed);
 647         }
 648
 649         br->default_pvid = pvid;
 650
 651 out:
 652         kfree(changed);
 653         return err;
 654
 655 err_port:
 656         list_for_each_entry_continue_reverse(p, &br->port_list, list) {
 657                 if (!test_bit(p->port_no, changed))
 658                         continue;
 659
 660                 if (old_pvid)
 661                         nbp_vlan_add(p, old_pvid,
 662                                      BRIDGE_VLAN_INFO_PVID |
 663                                      BRIDGE_VLAN_INFO_UNTAGGED);
 664                 nbp_vlan_delete(p, pvid);
 665         }
 666
 667         if (test_bit(0, changed)) {
 668                 if (old_pvid)
 669                         br_vlan_add(br, old_pvid,
 670                                     BRIDGE_VLAN_INFO_PVID |
 671                                     BRIDGE_VLAN_INFO_UNTAGGED);
 672                 br_vlan_delete(br, pvid);
 673         }
 674         goto out;
 675 }
 676
 677 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val)
 678 {
 679         u16 pvid = val;
 680         int err = 0;
 681
 682         if (val >= VLAN_VID_MASK)
 683                 return -EINVAL;
 684
 685         if (!rtnl_trylock())
 686                 return restart_syscall();
 687
 688         if (pvid == br->default_pvid)
 689                 goto unlock;
 690
 691         /* Only allow default pvid change when filtering is disabled */
 692         if (br->vlan_enabled) {
 693                 pr_info_once("Please disable vlan filtering to change default_pvid\n");
 694                 err = -EPERM;
 695                 goto unlock;
 696         }
 697
 698         if (!pvid)
 699                 br_vlan_disable_default_pvid(br);
 700         else
 701                 err = __br_vlan_set_default_pvid(br, pvid);
 702
 703 unlock:
 704         rtnl_unlock();
 705         return err;
 706 }
 707
 708 int br_vlan_init(struct net_bridge *br)
 709 {
 710         br->vlan_proto = htons(ETH_P_8021Q);
 711         br->default_pvid = 1;
 712         return br_vlan_add(br, 1,
 713                            BRIDGE_VLAN_INFO_PVID | BRIDGE_VLAN_INFO_UNTAGGED);
 714 }
 715
 716 /* Must be protected by RTNL.
 717  * Must be called with vid in range from 1 to 4094 inclusive.
 718  */
 719 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 720 {
 721         struct net_port_vlans *pv = NULL;
 722         int err;
 723
 724         ASSERT_RTNL();
 725
 726         pv = rtnl_dereference(port->vlan_info);
 727         if (pv)
 728                 return __vlan_add(pv, vid, flags);
 729
 730         /* Create port vlan infomration
 731          */
 732         pv = kzalloc(sizeof(*pv), GFP_KERNEL);
 733         if (!pv) {
 734                 err = -ENOMEM;
 735                 goto clean_up;
 736         }
 737
 738         pv->port_idx = port->port_no;
 739         pv->parent.port = port;
 740         err = __vlan_add(pv, vid, flags);
 741         if (err)
 742                 goto clean_up;
 743
 744         rcu_assign_pointer(port->vlan_info, pv);
 745         return 0;
 746
 747 clean_up:
 748         kfree(pv);
 749         return err;
 750 }
 751
 752 /* Must be protected by RTNL.
 753  * Must be called with vid in range from 1 to 4094 inclusive.
 754  */
 755 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 756 {
 757         struct net_port_vlans *pv;
 758
 759         ASSERT_RTNL();
 760
 761         pv = rtnl_dereference(port->vlan_info);
 762         if (!pv)
 763                 return -EINVAL;
 764
 765         br_fdb_find_delete_local(port->br, port, port->dev->dev_addr, vid);
 766         br_fdb_delete_by_port(port->br, port, vid, 0);
 767
 768         return __vlan_del(pv, vid);
 769 }
 770
 771 void nbp_vlan_flush(struct net_bridge_port *port)
 772 {
 773         struct net_port_vlans *pv;
 774         u16 vid;
 775
 776         ASSERT_RTNL();
 777
 778         pv = rtnl_dereference(port->vlan_info);
 779         if (!pv)
 780                 return;
 781
 782         for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID)
 783                 vlan_vid_del(port->dev, port->br->vlan_proto, vid);
 784
 785         __vlan_flush(pv);
 786 }
 787
 788 bool nbp_vlan_find(struct net_bridge_port *port, u16 vid)
 789 {
 790         struct net_port_vlans *pv;
 791         bool found = false;
 792
 793         rcu_read_lock();
 794         pv = rcu_dereference(port->vlan_info);
 795
 796         if (!pv)
 797                 goto out;
 798
 799         if (test_bit(vid, pv->vlan_bitmap))
 800                 found = true;
 801
 802 out:
 803         rcu_read_unlock();
 804         return found;
 805 }
 806
 807 int nbp_vlan_init(struct net_bridge_port *p)
 808 {
 809         return p->br->default_pvid ?
 810                         nbp_vlan_add(p, p->br->default_pvid,
 811                                      BRIDGE_VLAN_INFO_PVID |
 812                                      BRIDGE_VLAN_INFO_UNTAGGED) :
 813                         0;
 814 }