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 inline int br_vlan_cmp(struct rhashtable_compare_arg *arg,
  10                               const void *ptr)
  11 {
  12         const struct net_bridge_vlan *vle = ptr;
  13         u16 vid = *(u16 *)arg->key;
  14
  15         return vle->vid != vid;
  16 }
  17
  18 static const struct rhashtable_params br_vlan_rht_params = {
  19         .head_offset = offsetof(struct net_bridge_vlan, vnode),
  20         .key_offset = offsetof(struct net_bridge_vlan, vid),
  21         .key_len = sizeof(u16),
  22         .nelem_hint = 3,
  23         .locks_mul = 1,
  24         .max_size = VLAN_N_VID,
  25         .obj_cmpfn = br_vlan_cmp,
  26         .automatic_shrinking = true,
  27 };
  28
  29 static struct net_bridge_vlan *br_vlan_lookup(struct rhashtable *tbl, u16 vid)
  30 {
  31         return rhashtable_lookup_fast(tbl, &vid, br_vlan_rht_params);
  32 }
  33
  34 static void __vlan_add_pvid(struct net_bridge_vlan_group *vg, u16 vid)
  35 {
  36         if (vg->pvid == vid)
  37                 return;
  38
  39         smp_wmb();
  40         vg->pvid = vid;
  41 }
  42
  43 static void __vlan_delete_pvid(struct net_bridge_vlan_group *vg, u16 vid)
  44 {
  45         if (vg->pvid != vid)
  46                 return;
  47
  48         smp_wmb();
  49         vg->pvid = 0;
  50 }
  51
  52 static void __vlan_add_flags(struct net_bridge_vlan *v, u16 flags)
  53 {
  54         struct net_bridge_vlan_group *vg;
  55
  56         if (br_vlan_is_master(v))
  57                 vg = v->br->vlgrp;
  58         else
  59                 vg = v->port->vlgrp;
  60
  61         if (flags & BRIDGE_VLAN_INFO_PVID)
  62                 __vlan_add_pvid(vg, v->vid);
  63         else
  64                 __vlan_delete_pvid(vg, v->vid);
  65
  66         if (flags & BRIDGE_VLAN_INFO_UNTAGGED)
  67                 v->flags |= BRIDGE_VLAN_INFO_UNTAGGED;
  68         else
  69                 v->flags &= ~BRIDGE_VLAN_INFO_UNTAGGED;
  70 }
  71
  72 static int __vlan_vid_add(struct net_device *dev, struct net_bridge *br,
  73                           u16 vid, u16 flags)
  74 {
  75         const struct net_device_ops *ops = dev->netdev_ops;
  76         int err;
  77
  78         /* If driver uses VLAN ndo ops, use 8021q to install vid
  79          * on device, otherwise try switchdev ops to install vid.
  80          */
  81
  82         if (ops->ndo_vlan_rx_add_vid) {
  83                 err = vlan_vid_add(dev, br->vlan_proto, vid);
  84         } else {
  85                 struct switchdev_obj_vlan v = {
  86                         .flags = flags,
  87                         .vid_begin = vid,
  88                         .vid_end = vid,
  89                 };
  90
  91                 err = switchdev_port_obj_add(dev, SWITCHDEV_OBJ_PORT_VLAN, &v);
  92                 if (err == -EOPNOTSUPP)
  93                         err = 0;
  94         }
  95
  96         return err;
  97 }
  98
  99 static void __vlan_add_list(struct net_bridge_vlan *v)
 100 {
 101         struct list_head *headp, *hpos;
 102         struct net_bridge_vlan *vent;
 103
 104         headp = br_vlan_is_master(v) ? &v->br->vlgrp->vlan_list :
 105                                        &v->port->vlgrp->vlan_list;
 106         list_for_each_prev(hpos, headp) {
 107                 vent = list_entry(hpos, struct net_bridge_vlan, vlist);
 108                 if (v->vid < vent->vid)
 109                         continue;
 110                 else
 111                         break;
 112         }
 113         list_add(&v->vlist, hpos);
 114 }
 115
 116 static void __vlan_del_list(struct net_bridge_vlan *v)
 117 {
 118         list_del(&v->vlist);
 119 }
 120
 121 static int __vlan_vid_del(struct net_device *dev, struct net_bridge *br,
 122                           u16 vid)
 123 {
 124         const struct net_device_ops *ops = dev->netdev_ops;
 125         int err = 0;
 126
 127         /* If driver uses VLAN ndo ops, use 8021q to delete vid
 128          * on device, otherwise try switchdev ops to delete vid.
 129          */
 130
 131         if (ops->ndo_vlan_rx_kill_vid) {
 132                 vlan_vid_del(dev, br->vlan_proto, vid);
 133         } else {
 134                 struct switchdev_obj_vlan v = {
 135                         .vid_begin = vid,
 136                         .vid_end = vid,
 137                 };
 138
 139                 err = switchdev_port_obj_del(dev, SWITCHDEV_OBJ_PORT_VLAN, &v);
 140                 if (err == -EOPNOTSUPP)
 141                         err = 0;
 142         }
 143
 144         return err;
 145 }
 146
 147 /* This is the shared VLAN add function which works for both ports and bridge
 148  * devices. There are four possible calls to this function in terms of the
 149  * vlan entry type:
 150  * 1. vlan is being added on a port (no master flags, global entry exists)
 151  * 2. vlan is being added on a bridge (both master and brvlan flags)
 152  * 3. vlan is being added on a port, but a global entry didn't exist which
 153  *    is being created right now (master flag set, brvlan flag unset), the
 154  *    global entry is used for global per-vlan features, but not for filtering
 155  * 4. same as 3 but with both master and brvlan flags set so the entry
 156  *    will be used for filtering in both the port and the bridge
 157  */
 158 static int __vlan_add(struct net_bridge_vlan *v, u16 flags)
 159 {
 160         struct net_bridge_vlan *masterv = NULL;
 161         struct net_bridge_port *p = NULL;
 162         struct rhashtable *tbl;
 163         struct net_device *dev;
 164         struct net_bridge *br;
 165         int err;
 166
 167         if (br_vlan_is_master(v)) {
 168                 br = v->br;
 169                 dev = br->dev;
 170                 tbl = &br->vlgrp->vlan_hash;
 171         } else {
 172                 p = v->port;
 173                 br = p->br;
 174                 dev = p->dev;
 175                 tbl = &p->vlgrp->vlan_hash;
 176         }
 177
 178         if (p) {
 179                 u16 master_flags = flags;
 180
 181                 /* Add VLAN to the device filter if it is supported.
 182                  * This ensures tagged traffic enters the bridge when
 183                  * promiscuous mode is disabled by br_manage_promisc().
 184                  */
 185                 err = __vlan_vid_add(dev, br, v->vid, flags);
 186                 if (err)
 187                         goto out;
 188
 189                 /* need to work on the master vlan too */
 190                 if (flags & BRIDGE_VLAN_INFO_MASTER) {
 191                         master_flags |= BRIDGE_VLAN_INFO_BRENTRY;
 192                         err = br_vlan_add(br, v->vid, master_flags);
 193                         if (err)
 194                                 goto out_filt;
 195                 }
 196
 197                 masterv = br_vlan_find(br->vlgrp, v->vid);
 198                 if (!masterv) {
 199                         /* missing global ctx, create it now */
 200                         err = br_vlan_add(br, v->vid, master_flags);
 201                         if (err)
 202                                 goto out_filt;
 203                         masterv = br_vlan_find(br->vlgrp, v->vid);
 204                         WARN_ON(!masterv);
 205                 }
 206                 atomic_inc(&masterv->refcnt);
 207                 v->brvlan = masterv;
 208         }
 209
 210         /* Add the dev mac only if it's a usable vlan */
 211         if (br_vlan_should_use(v)) {
 212                 err = br_fdb_insert(br, p, dev->dev_addr, v->vid);
 213                 if (err) {
 214                         br_err(br, "failed insert local address into bridge forwarding table\n");
 215                         goto out_filt;
 216                 }
 217         }
 218
 219         err = rhashtable_lookup_insert_fast(tbl, &v->vnode, br_vlan_rht_params);
 220         if (err)
 221                 goto out_fdb_insert;
 222
 223         __vlan_add_list(v);
 224         __vlan_add_flags(v, flags);
 225         if (br_vlan_is_master(v)) {
 226                 if (br_vlan_is_brentry(v))
 227                         br->vlgrp->num_vlans++;
 228         } else {
 229                 p->vlgrp->num_vlans++;
 230         }
 231 out:
 232         return err;
 233
 234 out_fdb_insert:
 235         br_fdb_find_delete_local(br, p, br->dev->dev_addr, v->vid);
 236
 237 out_filt:
 238         if (p) {
 239                 __vlan_vid_del(dev, br, v->vid);
 240                 if (masterv) {
 241                         atomic_dec(&masterv->refcnt);
 242                         v->brvlan = NULL;
 243                 }
 244         }
 245
 246         goto out;
 247 }
 248
 249 static int __vlan_del(struct net_bridge_vlan *v)
 250 {
 251         struct net_bridge_vlan *masterv = v;
 252         struct net_bridge_vlan_group *vg;
 253         struct net_bridge_port *p = NULL;
 254         struct net_bridge *br;
 255         int err = 0;
 256
 257         if (br_vlan_is_master(v)) {
 258                 br = v->br;
 259                 vg = v->br->vlgrp;
 260         } else {
 261                 p = v->port;
 262                 br = p->br;
 263                 vg = v->port->vlgrp;
 264                 masterv = v->brvlan;
 265         }
 266
 267         __vlan_delete_pvid(vg, v->vid);
 268         if (p) {
 269                 err = __vlan_vid_del(p->dev, p->br, v->vid);
 270                 if (err)
 271                         goto out;
 272         }
 273
 274         if (br_vlan_is_master(v)) {
 275                 if (br_vlan_is_brentry(v)) {
 276                         v->flags &= ~BRIDGE_VLAN_INFO_BRENTRY;
 277                         br->vlgrp->num_vlans--;
 278                 }
 279         } else {
 280                 p->vlgrp->num_vlans--;
 281         }
 282
 283         if (masterv != v) {
 284                 rhashtable_remove_fast(&vg->vlan_hash, &v->vnode,
 285                                        br_vlan_rht_params);
 286                 __vlan_del_list(v);
 287                 kfree_rcu(v, rcu);
 288         }
 289
 290         if (atomic_dec_and_test(&masterv->refcnt)) {
 291                 rhashtable_remove_fast(&masterv->br->vlgrp->vlan_hash,
 292                                        &masterv->vnode, br_vlan_rht_params);
 293                 __vlan_del_list(masterv);
 294                 kfree_rcu(masterv, rcu);
 295         }
 296 out:
 297         return err;
 298 }
 299
 300 static void __vlan_flush(struct net_bridge_vlan_group *vlgrp)
 301 {
 302         struct net_bridge_vlan *vlan, *tmp;
 303
 304         __vlan_delete_pvid(vlgrp, vlgrp->pvid);
 305         list_for_each_entry_safe(vlan, tmp, &vlgrp->vlan_list, vlist)
 306                 __vlan_del(vlan);
 307         rhashtable_destroy(&vlgrp->vlan_hash);
 308         kfree(vlgrp);
 309 }
 310
 311 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 312                                struct net_bridge_vlan_group *vg,
 313                                struct sk_buff *skb)
 314 {
 315         struct net_bridge_vlan *v;
 316         u16 vid;
 317
 318         /* If this packet was not filtered at input, let it pass */
 319         if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
 320                 goto out;
 321
 322         /* At this point, we know that the frame was filtered and contains
 323          * a valid vlan id.  If the vlan id has untagged flag set,
 324          * send untagged; otherwise, send tagged.
 325          */
 326         br_vlan_get_tag(skb, &vid);
 327         v = br_vlan_find(vg, vid);
 328         /* Vlan entry must be configured at this point.  The
 329          * only exception is the bridge is set in promisc mode and the
 330          * packet is destined for the bridge device.  In this case
 331          * pass the packet as is.
 332          */
 333         if (!v || !br_vlan_should_use(v)) {
 334                 if ((br->dev->flags & IFF_PROMISC) && skb->dev == br->dev) {
 335                         goto out;
 336                 } else {
 337                         kfree_skb(skb);
 338                         return NULL;
 339                 }
 340         }
 341         if (v->flags & BRIDGE_VLAN_INFO_UNTAGGED)
 342                 skb->vlan_tci = 0;
 343
 344 out:
 345         return skb;
 346 }
 347
 348 /* Called under RCU */
 349 static bool __allowed_ingress(struct net_bridge_vlan_group *vg, __be16 proto,
 350                               struct sk_buff *skb, u16 *vid)
 351 {
 352         const struct net_bridge_vlan *v;
 353         bool tagged;
 354
 355         BR_INPUT_SKB_CB(skb)->vlan_filtered = true;
 356         /* If vlan tx offload is disabled on bridge device and frame was
 357          * sent from vlan device on the bridge device, it does not have
 358          * HW accelerated vlan tag.
 359          */
 360         if (unlikely(!skb_vlan_tag_present(skb) &&
 361                      skb->protocol == proto)) {
 362                 skb = skb_vlan_untag(skb);
 363                 if (unlikely(!skb))
 364                         return false;
 365         }
 366
 367         if (!br_vlan_get_tag(skb, vid)) {
 368                 /* Tagged frame */
 369                 if (skb->vlan_proto != proto) {
 370                         /* Protocol-mismatch, empty out vlan_tci for new tag */
 371                         skb_push(skb, ETH_HLEN);
 372                         skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto,
 373                                                         skb_vlan_tag_get(skb));
 374                         if (unlikely(!skb))
 375                                 return false;
 376
 377                         skb_pull(skb, ETH_HLEN);
 378                         skb_reset_mac_len(skb);
 379                         *vid = 0;
 380                         tagged = false;
 381                 } else {
 382                         tagged = true;
 383                 }
 384         } else {
 385                 /* Untagged frame */
 386                 tagged = false;
 387         }
 388
 389         if (!*vid) {
 390                 u16 pvid = br_get_pvid(vg);
 391
 392                 /* Frame had a tag with VID 0 or did not have a tag.
 393                  * See if pvid is set on this port.  That tells us which
 394                  * vlan untagged or priority-tagged traffic belongs to.
 395                  */
 396                 if (!pvid)
 397                         goto drop;
 398
 399                 /* PVID is set on this port.  Any untagged or priority-tagged
 400                  * ingress frame is considered to belong to this vlan.
 401                  */
 402                 *vid = pvid;
 403                 if (likely(!tagged))
 404                         /* Untagged Frame. */
 405                         __vlan_hwaccel_put_tag(skb, proto, pvid);
 406                 else
 407                         /* Priority-tagged Frame.
 408                          * At this point, We know that skb->vlan_tci had
 409                          * VLAN_TAG_PRESENT bit and its VID field was 0x000.
 410                          * We update only VID field and preserve PCP field.
 411                          */
 412                         skb->vlan_tci |= pvid;
 413
 414                 return true;
 415         }
 416
 417         /* Frame had a valid vlan tag.  See if vlan is allowed */
 418         v = br_vlan_find(vg, *vid);
 419         if (v && br_vlan_should_use(v))
 420                 return true;
 421 drop:
 422         kfree_skb(skb);
 423         return false;
 424 }
 425
 426 bool br_allowed_ingress(const struct net_bridge *br,
 427                         struct net_bridge_vlan_group *vg, struct sk_buff *skb,
 428                         u16 *vid)
 429 {
 430         /* If VLAN filtering is disabled on the bridge, all packets are
 431          * permitted.
 432          */
 433         if (!br->vlan_enabled) {
 434                 BR_INPUT_SKB_CB(skb)->vlan_filtered = false;
 435                 return true;
 436         }
 437
 438         return __allowed_ingress(vg, br->vlan_proto, skb, vid);
 439 }
 440
 441 /* Called under RCU. */
 442 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 443                        const struct sk_buff *skb)
 444 {
 445         const struct net_bridge_vlan *v;
 446         u16 vid;
 447
 448         /* If this packet was not filtered at input, let it pass */
 449         if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
 450                 return true;
 451
 452         br_vlan_get_tag(skb, &vid);
 453         v = br_vlan_find(vg, vid);
 454         if (v && br_vlan_should_use(v))
 455                 return true;
 456
 457         return false;
 458 }
 459
 460 /* Called under RCU */
 461 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid)
 462 {
 463         struct net_bridge_vlan_group *vg;
 464         struct net_bridge *br = p->br;
 465
 466         /* If filtering was disabled at input, let it pass. */
 467         if (!br->vlan_enabled)
 468                 return true;
 469
 470         vg = p->vlgrp;
 471         if (!vg || !vg->num_vlans)
 472                 return false;
 473
 474         if (!br_vlan_get_tag(skb, vid) && skb->vlan_proto != br->vlan_proto)
 475                 *vid = 0;
 476
 477         if (!*vid) {
 478                 *vid = br_get_pvid(vg);
 479                 if (!*vid)
 480                         return false;
 481
 482                 return true;
 483         }
 484
 485         if (br_vlan_find(vg, *vid))
 486                 return true;
 487
 488         return false;
 489 }
 490
 491 /* Must be protected by RTNL.
 492  * Must be called with vid in range from 1 to 4094 inclusive.
 493  */
 494 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 495 {
 496         struct net_bridge_vlan *vlan;
 497         int ret;
 498
 499         ASSERT_RTNL();
 500
 501         vlan = br_vlan_find(br->vlgrp, vid);
 502         if (vlan) {
 503                 if (!br_vlan_is_brentry(vlan)) {
 504                         /* Trying to change flags of non-existent bridge vlan */
 505                         if (!(flags & BRIDGE_VLAN_INFO_BRENTRY))
 506                                 return -EINVAL;
 507                         /* It was only kept for port vlans, now make it real */
 508                         ret = br_fdb_insert(br, NULL, br->dev->dev_addr,
 509                                             vlan->vid);
 510                         if (ret) {
 511                                 br_err(br, "failed insert local address into bridge forwarding table\n");
 512                                 return ret;
 513                         }
 514                         atomic_inc(&vlan->refcnt);
 515                         vlan->flags |= BRIDGE_VLAN_INFO_BRENTRY;
 516                         br->vlgrp->num_vlans++;
 517                 }
 518                 __vlan_add_flags(vlan, flags);
 519                 return 0;
 520         }
 521
 522         vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
 523         if (!vlan)
 524                 return -ENOMEM;
 525
 526         vlan->vid = vid;
 527         vlan->flags = flags | BRIDGE_VLAN_INFO_MASTER;
 528         vlan->flags &= ~BRIDGE_VLAN_INFO_PVID;
 529         vlan->br = br;
 530         if (flags & BRIDGE_VLAN_INFO_BRENTRY)
 531                 atomic_set(&vlan->refcnt, 1);
 532         ret = __vlan_add(vlan, flags);
 533         if (ret)
 534                 kfree(vlan);
 535
 536         return ret;
 537 }
 538
 539 /* Must be protected by RTNL.
 540  * Must be called with vid in range from 1 to 4094 inclusive.
 541  */
 542 int br_vlan_delete(struct net_bridge *br, u16 vid)
 543 {
 544         struct net_bridge_vlan *v;
 545
 546         ASSERT_RTNL();
 547
 548         v = br_vlan_find(br->vlgrp, vid);
 549         if (!v || !br_vlan_is_brentry(v))
 550                 return -ENOENT;
 551
 552         br_fdb_find_delete_local(br, NULL, br->dev->dev_addr, vid);
 553
 554         return __vlan_del(v);
 555 }
 556
 557 void br_vlan_flush(struct net_bridge *br)
 558 {
 559         ASSERT_RTNL();
 560
 561         __vlan_flush(br_vlan_group(br));
 562 }
 563
 564 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid)
 565 {
 566         if (!vg)
 567                 return NULL;
 568
 569         return br_vlan_lookup(&vg->vlan_hash, vid);
 570 }
 571
 572 /* Must be protected by RTNL. */
 573 static void recalculate_group_addr(struct net_bridge *br)
 574 {
 575         if (br->group_addr_set)
 576                 return;
 577
 578         spin_lock_bh(&br->lock);
 579         if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q)) {
 580                 /* Bridge Group Address */
 581                 br->group_addr[5] = 0x00;
 582         } else { /* vlan_enabled && ETH_P_8021AD */
 583                 /* Provider Bridge Group Address */
 584                 br->group_addr[5] = 0x08;
 585         }
 586         spin_unlock_bh(&br->lock);
 587 }
 588
 589 /* Must be protected by RTNL. */
 590 void br_recalculate_fwd_mask(struct net_bridge *br)
 591 {
 592         if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q))
 593                 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
 594         else /* vlan_enabled && ETH_P_8021AD */
 595                 br->group_fwd_mask_required = BR_GROUPFWD_8021AD &
 596                                               ~(1u << br->group_addr[5]);
 597 }
 598
 599 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
 600 {
 601         if (br->vlan_enabled == val)
 602                 return 0;
 603
 604         br->vlan_enabled = val;
 605         br_manage_promisc(br);
 606         recalculate_group_addr(br);
 607         br_recalculate_fwd_mask(br);
 608
 609         return 0;
 610 }
 611
 612 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
 613 {
 614         if (!rtnl_trylock())
 615                 return restart_syscall();
 616
 617         __br_vlan_filter_toggle(br, val);
 618         rtnl_unlock();
 619
 620         return 0;
 621 }
 622
 623 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto)
 624 {
 625         int err = 0;
 626         struct net_bridge_port *p;
 627         struct net_bridge_vlan *vlan;
 628         __be16 oldproto;
 629
 630         if (br->vlan_proto == proto)
 631                 return 0;
 632
 633         /* Add VLANs for the new proto to the device filter. */
 634         list_for_each_entry(p, &br->port_list, list) {
 635                 list_for_each_entry(vlan, &p->vlgrp->vlan_list, vlist) {
 636                         err = vlan_vid_add(p->dev, proto, vlan->vid);
 637                         if (err)
 638                                 goto err_filt;
 639                 }
 640         }
 641
 642         oldproto = br->vlan_proto;
 643         br->vlan_proto = proto;
 644
 645         recalculate_group_addr(br);
 646         br_recalculate_fwd_mask(br);
 647
 648         /* Delete VLANs for the old proto from the device filter. */
 649         list_for_each_entry(p, &br->port_list, list)
 650                 list_for_each_entry(vlan, &p->vlgrp->vlan_list, vlist)
 651                         vlan_vid_del(p->dev, oldproto, vlan->vid);
 652
 653         return 0;
 654
 655 err_filt:
 656         list_for_each_entry_continue_reverse(vlan, &p->vlgrp->vlan_list, vlist)
 657                 vlan_vid_del(p->dev, proto, vlan->vid);
 658
 659         list_for_each_entry_continue_reverse(p, &br->port_list, list)
 660                 list_for_each_entry(vlan, &p->vlgrp->vlan_list, vlist)
 661                         vlan_vid_del(p->dev, proto, vlan->vid);
 662
 663         return err;
 664 }
 665
 666 int br_vlan_set_proto(struct net_bridge *br, unsigned long val)
 667 {
 668         int err;
 669
 670         if (val != ETH_P_8021Q && val != ETH_P_8021AD)
 671                 return -EPROTONOSUPPORT;
 672
 673         if (!rtnl_trylock())
 674                 return restart_syscall();
 675
 676         err = __br_vlan_set_proto(br, htons(val));
 677         rtnl_unlock();
 678
 679         return err;
 680 }
 681
 682 static bool vlan_default_pvid(struct net_bridge_vlan_group *vg, u16 vid)
 683 {
 684         struct net_bridge_vlan *v;
 685
 686         if (vid != vg->pvid)
 687                 return false;
 688
 689         v = br_vlan_lookup(&vg->vlan_hash, vid);
 690         if (v && br_vlan_should_use(v) &&
 691             (v->flags & BRIDGE_VLAN_INFO_UNTAGGED))
 692                 return true;
 693
 694         return false;
 695 }
 696
 697 static void br_vlan_disable_default_pvid(struct net_bridge *br)
 698 {
 699         struct net_bridge_port *p;
 700         u16 pvid = br->default_pvid;
 701
 702         /* Disable default_pvid on all ports where it is still
 703          * configured.
 704          */
 705         if (vlan_default_pvid(br->vlgrp, pvid))
 706                 br_vlan_delete(br, pvid);
 707
 708         list_for_each_entry(p, &br->port_list, list) {
 709                 if (vlan_default_pvid(p->vlgrp, pvid))
 710                         nbp_vlan_delete(p, pvid);
 711         }
 712
 713         br->default_pvid = 0;
 714 }
 715
 716 static int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid)
 717 {
 718         const struct net_bridge_vlan *pvent;
 719         struct net_bridge_port *p;
 720         u16 old_pvid;
 721         int err = 0;
 722         unsigned long *changed;
 723
 724         changed = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
 725                           GFP_KERNEL);
 726         if (!changed)
 727                 return -ENOMEM;
 728
 729         old_pvid = br->default_pvid;
 730
 731         /* Update default_pvid config only if we do not conflict with
 732          * user configuration.
 733          */
 734         pvent = br_vlan_find(br->vlgrp, pvid);
 735         if ((!old_pvid || vlan_default_pvid(br->vlgrp, old_pvid)) &&
 736             (!pvent || !br_vlan_should_use(pvent))) {
 737                 err = br_vlan_add(br, pvid,
 738                                   BRIDGE_VLAN_INFO_PVID |
 739                                   BRIDGE_VLAN_INFO_UNTAGGED |
 740                                   BRIDGE_VLAN_INFO_BRENTRY);
 741                 if (err)
 742                         goto out;
 743                 br_vlan_delete(br, old_pvid);
 744                 set_bit(0, changed);
 745         }
 746
 747         list_for_each_entry(p, &br->port_list, list) {
 748                 /* Update default_pvid config only if we do not conflict with
 749                  * user configuration.
 750                  */
 751                 if ((old_pvid &&
 752                      !vlan_default_pvid(p->vlgrp, old_pvid)) ||
 753                     br_vlan_find(p->vlgrp, pvid))
 754                         continue;
 755
 756                 err = nbp_vlan_add(p, pvid,
 757                                    BRIDGE_VLAN_INFO_PVID |
 758                                    BRIDGE_VLAN_INFO_UNTAGGED);
 759                 if (err)
 760                         goto err_port;
 761                 nbp_vlan_delete(p, old_pvid);
 762                 set_bit(p->port_no, changed);
 763         }
 764
 765         br->default_pvid = pvid;
 766
 767 out:
 768         kfree(changed);
 769         return err;
 770
 771 err_port:
 772         list_for_each_entry_continue_reverse(p, &br->port_list, list) {
 773                 if (!test_bit(p->port_no, changed))
 774                         continue;
 775
 776                 if (old_pvid)
 777                         nbp_vlan_add(p, old_pvid,
 778                                      BRIDGE_VLAN_INFO_PVID |
 779                                      BRIDGE_VLAN_INFO_UNTAGGED);
 780                 nbp_vlan_delete(p, pvid);
 781         }
 782
 783         if (test_bit(0, changed)) {
 784                 if (old_pvid)
 785                         br_vlan_add(br, old_pvid,
 786                                     BRIDGE_VLAN_INFO_PVID |
 787                                     BRIDGE_VLAN_INFO_UNTAGGED |
 788                                     BRIDGE_VLAN_INFO_BRENTRY);
 789                 br_vlan_delete(br, pvid);
 790         }
 791         goto out;
 792 }
 793
 794 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val)
 795 {
 796         u16 pvid = val;
 797         int err = 0;
 798
 799         if (val >= VLAN_VID_MASK)
 800                 return -EINVAL;
 801
 802         if (!rtnl_trylock())
 803                 return restart_syscall();
 804
 805         if (pvid == br->default_pvid)
 806                 goto unlock;
 807
 808         /* Only allow default pvid change when filtering is disabled */
 809         if (br->vlan_enabled) {
 810                 pr_info_once("Please disable vlan filtering to change default_pvid\n");
 811                 err = -EPERM;
 812                 goto unlock;
 813         }
 814
 815         if (!pvid)
 816                 br_vlan_disable_default_pvid(br);
 817         else
 818                 err = __br_vlan_set_default_pvid(br, pvid);
 819
 820 unlock:
 821         rtnl_unlock();
 822         return err;
 823 }
 824
 825 int br_vlan_init(struct net_bridge *br)
 826 {
 827         int ret = -ENOMEM;
 828
 829         br->vlgrp = kzalloc(sizeof(struct net_bridge_vlan_group), GFP_KERNEL);
 830         if (!br->vlgrp)
 831                 goto out;
 832         ret = rhashtable_init(&br->vlgrp->vlan_hash, &br_vlan_rht_params);
 833         if (ret)
 834                 goto err_rhtbl;
 835         INIT_LIST_HEAD(&br->vlgrp->vlan_list);
 836         br->vlan_proto = htons(ETH_P_8021Q);
 837         br->default_pvid = 1;
 838         ret = br_vlan_add(br, 1,
 839                           BRIDGE_VLAN_INFO_PVID | BRIDGE_VLAN_INFO_UNTAGGED |
 840                           BRIDGE_VLAN_INFO_BRENTRY);
 841         if (ret)
 842                 goto err_vlan_add;
 843
 844 out:
 845         return ret;
 846
 847 err_vlan_add:
 848         rhashtable_destroy(&br->vlgrp->vlan_hash);
 849 err_rhtbl:
 850         kfree(br->vlgrp);
 851
 852         goto out;
 853 }
 854
 855 int nbp_vlan_init(struct net_bridge_port *p)
 856 {
 857         struct net_bridge_vlan_group *vg;
 858         int ret = -ENOMEM;
 859
 860         vg = kzalloc(sizeof(struct net_bridge_vlan_group), GFP_KERNEL);
 861         if (!vg)
 862                 goto out;
 863
 864         ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params);
 865         if (ret)
 866                 goto err_rhtbl;
 867         INIT_LIST_HEAD(&vg->vlan_list);
 868         /* Make sure everything's committed before publishing vg */
 869         smp_wmb();
 870         p->vlgrp = vg;
 871         if (p->br->default_pvid) {
 872                 ret = nbp_vlan_add(p, p->br->default_pvid,
 873                                    BRIDGE_VLAN_INFO_PVID |
 874                                    BRIDGE_VLAN_INFO_UNTAGGED);
 875                 if (ret)
 876                         goto err_vlan_add;
 877         }
 878 out:
 879         return ret;
 880
 881 err_vlan_add:
 882         rhashtable_destroy(&vg->vlan_hash);
 883 err_rhtbl:
 884         kfree(vg);
 885
 886         goto out;
 887 }
 888
 889 /* Must be protected by RTNL.
 890  * Must be called with vid in range from 1 to 4094 inclusive.
 891  */
 892 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 893 {
 894         struct net_bridge_vlan *vlan;
 895         int ret;
 896
 897         ASSERT_RTNL();
 898
 899         vlan = br_vlan_find(port->vlgrp, vid);
 900         if (vlan) {
 901                 __vlan_add_flags(vlan, flags);
 902                 return 0;
 903         }
 904
 905         vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
 906         if (!vlan)
 907                 return -ENOMEM;
 908
 909         vlan->vid = vid;
 910         vlan->port = port;
 911         ret = __vlan_add(vlan, flags);
 912         if (ret)
 913                 kfree(vlan);
 914
 915         return ret;
 916 }
 917
 918 /* Must be protected by RTNL.
 919  * Must be called with vid in range from 1 to 4094 inclusive.
 920  */
 921 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 922 {
 923         struct net_bridge_vlan *v;
 924
 925         ASSERT_RTNL();
 926
 927         v = br_vlan_find(port->vlgrp, vid);
 928         if (!v)
 929                 return -ENOENT;
 930         br_fdb_find_delete_local(port->br, port, port->dev->dev_addr, vid);
 931         br_fdb_delete_by_port(port->br, port, vid, 0);
 932
 933         return __vlan_del(v);
 934 }
 935
 936 void nbp_vlan_flush(struct net_bridge_port *port)
 937 {
 938         struct net_bridge_vlan *vlan;
 939
 940         ASSERT_RTNL();
 941
 942         list_for_each_entry(vlan, &port->vlgrp->vlan_list, vlist)
 943                 vlan_vid_del(port->dev, port->br->vlan_proto, vlan->vid);
 944
 945         __vlan_flush(nbp_vlan_group(port));
 946 }