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_port_vlan v = {
  86                         .flags = flags,
  87                         .vid_begin = vid,
  88                         .vid_end = vid,
  89                 };
  90
  91                 err = switchdev_port_obj_add(dev, SWITCHDEV_OBJ_ID_PORT_VLAN,
  92                                              &v.obj);
  93                 if (err == -EOPNOTSUPP)
  94                         err = 0;
  95         }
  96
  97         return err;
  98 }
  99
 100 static void __vlan_add_list(struct net_bridge_vlan *v)
 101 {
 102         struct list_head *headp, *hpos;
 103         struct net_bridge_vlan *vent;
 104
 105         headp = br_vlan_is_master(v) ? &v->br->vlgrp->vlan_list :
 106                                        &v->port->vlgrp->vlan_list;
 107         list_for_each_prev(hpos, headp) {
 108                 vent = list_entry(hpos, struct net_bridge_vlan, vlist);
 109                 if (v->vid < vent->vid)
 110                         continue;
 111                 else
 112                         break;
 113         }
 114         list_add(&v->vlist, hpos);
 115 }
 116
 117 static void __vlan_del_list(struct net_bridge_vlan *v)
 118 {
 119         list_del(&v->vlist);
 120 }
 121
 122 static int __vlan_vid_del(struct net_device *dev, struct net_bridge *br,
 123                           u16 vid)
 124 {
 125         const struct net_device_ops *ops = dev->netdev_ops;
 126         int err = 0;
 127
 128         /* If driver uses VLAN ndo ops, use 8021q to delete vid
 129          * on device, otherwise try switchdev ops to delete vid.
 130          */
 131
 132         if (ops->ndo_vlan_rx_kill_vid) {
 133                 vlan_vid_del(dev, br->vlan_proto, vid);
 134         } else {
 135                 struct switchdev_obj_port_vlan v = {
 136                         .vid_begin = vid,
 137                         .vid_end = vid,
 138                 };
 139
 140                 err = switchdev_port_obj_del(dev, SWITCHDEV_OBJ_ID_PORT_VLAN,
 141                                              &v.obj);
 142                 if (err == -EOPNOTSUPP)
 143                         err = 0;
 144         }
 145
 146         return err;
 147 }
 148
 149 /* This is the shared VLAN add function which works for both ports and bridge
 150  * devices. There are four possible calls to this function in terms of the
 151  * vlan entry type:
 152  * 1. vlan is being added on a port (no master flags, global entry exists)
 153  * 2. vlan is being added on a bridge (both master and brvlan flags)
 154  * 3. vlan is being added on a port, but a global entry didn't exist which
 155  *    is being created right now (master flag set, brvlan flag unset), the
 156  *    global entry is used for global per-vlan features, but not for filtering
 157  * 4. same as 3 but with both master and brvlan flags set so the entry
 158  *    will be used for filtering in both the port and the bridge
 159  */
 160 static int __vlan_add(struct net_bridge_vlan *v, u16 flags)
 161 {
 162         struct net_bridge_vlan *masterv = NULL;
 163         struct net_bridge_port *p = NULL;
 164         struct rhashtable *tbl;
 165         struct net_device *dev;
 166         struct net_bridge *br;
 167         int err;
 168
 169         if (br_vlan_is_master(v)) {
 170                 br = v->br;
 171                 dev = br->dev;
 172                 tbl = &br->vlgrp->vlan_hash;
 173         } else {
 174                 p = v->port;
 175                 br = p->br;
 176                 dev = p->dev;
 177                 tbl = &p->vlgrp->vlan_hash;
 178         }
 179
 180         if (p) {
 181                 u16 master_flags = flags;
 182
 183                 /* Add VLAN to the device filter if it is supported.
 184                  * This ensures tagged traffic enters the bridge when
 185                  * promiscuous mode is disabled by br_manage_promisc().
 186                  */
 187                 err = __vlan_vid_add(dev, br, v->vid, flags);
 188                 if (err)
 189                         goto out;
 190
 191                 /* need to work on the master vlan too */
 192                 if (flags & BRIDGE_VLAN_INFO_MASTER) {
 193                         master_flags |= BRIDGE_VLAN_INFO_BRENTRY;
 194                         err = br_vlan_add(br, v->vid, master_flags);
 195                         if (err)
 196                                 goto out_filt;
 197                 }
 198
 199                 masterv = br_vlan_find(br->vlgrp, v->vid);
 200                 if (!masterv) {
 201                         /* missing global ctx, create it now */
 202                         err = br_vlan_add(br, v->vid, 0);
 203                         if (err)
 204                                 goto out_filt;
 205                         masterv = br_vlan_find(br->vlgrp, v->vid);
 206                         WARN_ON(!masterv);
 207                 }
 208                 atomic_inc(&masterv->refcnt);
 209                 v->brvlan = masterv;
 210         }
 211
 212         /* Add the dev mac only if it's a usable vlan */
 213         if (br_vlan_should_use(v)) {
 214                 err = br_fdb_insert(br, p, dev->dev_addr, v->vid);
 215                 if (err) {
 216                         br_err(br, "failed insert local address into bridge forwarding table\n");
 217                         goto out_filt;
 218                 }
 219         }
 220
 221         err = rhashtable_lookup_insert_fast(tbl, &v->vnode, br_vlan_rht_params);
 222         if (err)
 223                 goto out_fdb_insert;
 224
 225         __vlan_add_list(v);
 226         __vlan_add_flags(v, flags);
 227         if (br_vlan_is_master(v)) {
 228                 if (br_vlan_is_brentry(v))
 229                         br->vlgrp->num_vlans++;
 230         } else {
 231                 p->vlgrp->num_vlans++;
 232         }
 233 out:
 234         return err;
 235
 236 out_fdb_insert:
 237         br_fdb_find_delete_local(br, p, br->dev->dev_addr, v->vid);
 238
 239 out_filt:
 240         if (p) {
 241                 __vlan_vid_del(dev, br, v->vid);
 242                 if (masterv) {
 243                         atomic_dec(&masterv->refcnt);
 244                         v->brvlan = NULL;
 245                 }
 246         }
 247
 248         goto out;
 249 }
 250
 251 static int __vlan_del(struct net_bridge_vlan *v)
 252 {
 253         struct net_bridge_vlan *masterv = v;
 254         struct net_bridge_vlan_group *vg;
 255         struct net_bridge_port *p = NULL;
 256         struct net_bridge *br;
 257         int err = 0;
 258
 259         if (br_vlan_is_master(v)) {
 260                 br = v->br;
 261                 vg = v->br->vlgrp;
 262         } else {
 263                 p = v->port;
 264                 br = p->br;
 265                 vg = v->port->vlgrp;
 266                 masterv = v->brvlan;
 267         }
 268
 269         __vlan_delete_pvid(vg, v->vid);
 270         if (p) {
 271                 err = __vlan_vid_del(p->dev, p->br, v->vid);
 272                 if (err)
 273                         goto out;
 274         }
 275
 276         if (br_vlan_is_master(v)) {
 277                 if (br_vlan_is_brentry(v)) {
 278                         v->flags &= ~BRIDGE_VLAN_INFO_BRENTRY;
 279                         br->vlgrp->num_vlans--;
 280                 }
 281         } else {
 282                 p->vlgrp->num_vlans--;
 283         }
 284
 285         if (masterv != v) {
 286                 rhashtable_remove_fast(&vg->vlan_hash, &v->vnode,
 287                                        br_vlan_rht_params);
 288                 __vlan_del_list(v);
 289                 kfree_rcu(v, rcu);
 290         }
 291
 292         if (atomic_dec_and_test(&masterv->refcnt)) {
 293                 rhashtable_remove_fast(&masterv->br->vlgrp->vlan_hash,
 294                                        &masterv->vnode, br_vlan_rht_params);
 295                 __vlan_del_list(masterv);
 296                 kfree_rcu(masterv, rcu);
 297         }
 298 out:
 299         return err;
 300 }
 301
 302 static void __vlan_flush(struct net_bridge_vlan_group *vlgrp)
 303 {
 304         struct net_bridge_vlan *vlan, *tmp;
 305
 306         __vlan_delete_pvid(vlgrp, vlgrp->pvid);
 307         list_for_each_entry_safe(vlan, tmp, &vlgrp->vlan_list, vlist)
 308                 __vlan_del(vlan);
 309         rhashtable_destroy(&vlgrp->vlan_hash);
 310         kfree(vlgrp);
 311 }
 312
 313 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 314                                struct net_bridge_vlan_group *vg,
 315                                struct sk_buff *skb)
 316 {
 317         struct net_bridge_vlan *v;
 318         u16 vid;
 319
 320         /* If this packet was not filtered at input, let it pass */
 321         if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
 322                 goto out;
 323
 324         /* At this point, we know that the frame was filtered and contains
 325          * a valid vlan id.  If the vlan id has untagged flag set,
 326          * send untagged; otherwise, send tagged.
 327          */
 328         br_vlan_get_tag(skb, &vid);
 329         v = br_vlan_find(vg, vid);
 330         /* Vlan entry must be configured at this point.  The
 331          * only exception is the bridge is set in promisc mode and the
 332          * packet is destined for the bridge device.  In this case
 333          * pass the packet as is.
 334          */
 335         if (!v || !br_vlan_should_use(v)) {
 336                 if ((br->dev->flags & IFF_PROMISC) && skb->dev == br->dev) {
 337                         goto out;
 338                 } else {
 339                         kfree_skb(skb);
 340                         return NULL;
 341                 }
 342         }
 343         if (v->flags & BRIDGE_VLAN_INFO_UNTAGGED)
 344                 skb->vlan_tci = 0;
 345
 346 out:
 347         return skb;
 348 }
 349
 350 /* Called under RCU */
 351 static bool __allowed_ingress(struct net_bridge_vlan_group *vg, __be16 proto,
 352                               struct sk_buff *skb, u16 *vid)
 353 {
 354         const struct net_bridge_vlan *v;
 355         bool tagged;
 356
 357         BR_INPUT_SKB_CB(skb)->vlan_filtered = true;
 358         /* If vlan tx offload is disabled on bridge device and frame was
 359          * sent from vlan device on the bridge device, it does not have
 360          * HW accelerated vlan tag.
 361          */
 362         if (unlikely(!skb_vlan_tag_present(skb) &&
 363                      skb->protocol == proto)) {
 364                 skb = skb_vlan_untag(skb);
 365                 if (unlikely(!skb))
 366                         return false;
 367         }
 368
 369         if (!br_vlan_get_tag(skb, vid)) {
 370                 /* Tagged frame */
 371                 if (skb->vlan_proto != proto) {
 372                         /* Protocol-mismatch, empty out vlan_tci for new tag */
 373                         skb_push(skb, ETH_HLEN);
 374                         skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto,
 375                                                         skb_vlan_tag_get(skb));
 376                         if (unlikely(!skb))
 377                                 return false;
 378
 379                         skb_pull(skb, ETH_HLEN);
 380                         skb_reset_mac_len(skb);
 381                         *vid = 0;
 382                         tagged = false;
 383                 } else {
 384                         tagged = true;
 385                 }
 386         } else {
 387                 /* Untagged frame */
 388                 tagged = false;
 389         }
 390
 391         if (!*vid) {
 392                 u16 pvid = br_get_pvid(vg);
 393
 394                 /* Frame had a tag with VID 0 or did not have a tag.
 395                  * See if pvid is set on this port.  That tells us which
 396                  * vlan untagged or priority-tagged traffic belongs to.
 397                  */
 398                 if (!pvid)
 399                         goto drop;
 400
 401                 /* PVID is set on this port.  Any untagged or priority-tagged
 402                  * ingress frame is considered to belong to this vlan.
 403                  */
 404                 *vid = pvid;
 405                 if (likely(!tagged))
 406                         /* Untagged Frame. */
 407                         __vlan_hwaccel_put_tag(skb, proto, pvid);
 408                 else
 409                         /* Priority-tagged Frame.
 410                          * At this point, We know that skb->vlan_tci had
 411                          * VLAN_TAG_PRESENT bit and its VID field was 0x000.
 412                          * We update only VID field and preserve PCP field.
 413                          */
 414                         skb->vlan_tci |= pvid;
 415
 416                 return true;
 417         }
 418
 419         /* Frame had a valid vlan tag.  See if vlan is allowed */
 420         v = br_vlan_find(vg, *vid);
 421         if (v && br_vlan_should_use(v))
 422                 return true;
 423 drop:
 424         kfree_skb(skb);
 425         return false;
 426 }
 427
 428 bool br_allowed_ingress(const struct net_bridge *br,
 429                         struct net_bridge_vlan_group *vg, struct sk_buff *skb,
 430                         u16 *vid)
 431 {
 432         /* If VLAN filtering is disabled on the bridge, all packets are
 433          * permitted.
 434          */
 435         if (!br->vlan_enabled) {
 436                 BR_INPUT_SKB_CB(skb)->vlan_filtered = false;
 437                 return true;
 438         }
 439
 440         return __allowed_ingress(vg, br->vlan_proto, skb, vid);
 441 }
 442
 443 /* Called under RCU. */
 444 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 445                        const struct sk_buff *skb)
 446 {
 447         const struct net_bridge_vlan *v;
 448         u16 vid;
 449
 450         /* If this packet was not filtered at input, let it pass */
 451         if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
 452                 return true;
 453
 454         br_vlan_get_tag(skb, &vid);
 455         v = br_vlan_find(vg, vid);
 456         if (v && br_vlan_should_use(v))
 457                 return true;
 458
 459         return false;
 460 }
 461
 462 /* Called under RCU */
 463 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid)
 464 {
 465         struct net_bridge_vlan_group *vg;
 466         struct net_bridge *br = p->br;
 467
 468         /* If filtering was disabled at input, let it pass. */
 469         if (!br->vlan_enabled)
 470                 return true;
 471
 472         vg = p->vlgrp;
 473         if (!vg || !vg->num_vlans)
 474                 return false;
 475
 476         if (!br_vlan_get_tag(skb, vid) && skb->vlan_proto != br->vlan_proto)
 477                 *vid = 0;
 478
 479         if (!*vid) {
 480                 *vid = br_get_pvid(vg);
 481                 if (!*vid)
 482                         return false;
 483
 484                 return true;
 485         }
 486
 487         if (br_vlan_find(vg, *vid))
 488                 return true;
 489
 490         return false;
 491 }
 492
 493 /* Must be protected by RTNL.
 494  * Must be called with vid in range from 1 to 4094 inclusive.
 495  */
 496 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 497 {
 498         struct net_bridge_vlan *vlan;
 499         int ret;
 500
 501         ASSERT_RTNL();
 502
 503         vlan = br_vlan_find(br->vlgrp, vid);
 504         if (vlan) {
 505                 if (!br_vlan_is_brentry(vlan)) {
 506                         /* Trying to change flags of non-existent bridge vlan */
 507                         if (!(flags & BRIDGE_VLAN_INFO_BRENTRY))
 508                                 return -EINVAL;
 509                         /* It was only kept for port vlans, now make it real */
 510                         ret = br_fdb_insert(br, NULL, br->dev->dev_addr,
 511                                             vlan->vid);
 512                         if (ret) {
 513                                 br_err(br, "failed insert local address into bridge forwarding table\n");
 514                                 return ret;
 515                         }
 516                         atomic_inc(&vlan->refcnt);
 517                         vlan->flags |= BRIDGE_VLAN_INFO_BRENTRY;
 518                         br->vlgrp->num_vlans++;
 519                 }
 520                 __vlan_add_flags(vlan, flags);
 521                 return 0;
 522         }
 523
 524         vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
 525         if (!vlan)
 526                 return -ENOMEM;
 527
 528         vlan->vid = vid;
 529         vlan->flags = flags | BRIDGE_VLAN_INFO_MASTER;
 530         vlan->flags &= ~BRIDGE_VLAN_INFO_PVID;
 531         vlan->br = br;
 532         if (flags & BRIDGE_VLAN_INFO_BRENTRY)
 533                 atomic_set(&vlan->refcnt, 1);
 534         ret = __vlan_add(vlan, flags);
 535         if (ret)
 536                 kfree(vlan);
 537
 538         return ret;
 539 }
 540
 541 /* Must be protected by RTNL.
 542  * Must be called with vid in range from 1 to 4094 inclusive.
 543  */
 544 int br_vlan_delete(struct net_bridge *br, u16 vid)
 545 {
 546         struct net_bridge_vlan *v;
 547
 548         ASSERT_RTNL();
 549
 550         v = br_vlan_find(br->vlgrp, vid);
 551         if (!v || !br_vlan_is_brentry(v))
 552                 return -ENOENT;
 553
 554         br_fdb_find_delete_local(br, NULL, br->dev->dev_addr, vid);
 555
 556         return __vlan_del(v);
 557 }
 558
 559 void br_vlan_flush(struct net_bridge *br)
 560 {
 561         ASSERT_RTNL();
 562
 563         __vlan_flush(br_vlan_group(br));
 564 }
 565
 566 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid)
 567 {
 568         if (!vg)
 569                 return NULL;
 570
 571         return br_vlan_lookup(&vg->vlan_hash, vid);
 572 }
 573
 574 /* Must be protected by RTNL. */
 575 static void recalculate_group_addr(struct net_bridge *br)
 576 {
 577         if (br->group_addr_set)
 578                 return;
 579
 580         spin_lock_bh(&br->lock);
 581         if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q)) {
 582                 /* Bridge Group Address */
 583                 br->group_addr[5] = 0x00;
 584         } else { /* vlan_enabled && ETH_P_8021AD */
 585                 /* Provider Bridge Group Address */
 586                 br->group_addr[5] = 0x08;
 587         }
 588         spin_unlock_bh(&br->lock);
 589 }
 590
 591 /* Must be protected by RTNL. */
 592 void br_recalculate_fwd_mask(struct net_bridge *br)
 593 {
 594         if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q))
 595                 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
 596         else /* vlan_enabled && ETH_P_8021AD */
 597                 br->group_fwd_mask_required = BR_GROUPFWD_8021AD &
 598                                               ~(1u << br->group_addr[5]);
 599 }
 600
 601 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
 602 {
 603         if (br->vlan_enabled == val)
 604                 return 0;
 605
 606         br->vlan_enabled = val;
 607         br_manage_promisc(br);
 608         recalculate_group_addr(br);
 609         br_recalculate_fwd_mask(br);
 610
 611         return 0;
 612 }
 613
 614 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
 615 {
 616         if (!rtnl_trylock())
 617                 return restart_syscall();
 618
 619         __br_vlan_filter_toggle(br, val);
 620         rtnl_unlock();
 621
 622         return 0;
 623 }
 624
 625 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto)
 626 {
 627         int err = 0;
 628         struct net_bridge_port *p;
 629         struct net_bridge_vlan *vlan;
 630         __be16 oldproto;
 631
 632         if (br->vlan_proto == proto)
 633                 return 0;
 634
 635         /* Add VLANs for the new proto to the device filter. */
 636         list_for_each_entry(p, &br->port_list, list) {
 637                 list_for_each_entry(vlan, &p->vlgrp->vlan_list, vlist) {
 638                         err = vlan_vid_add(p->dev, proto, vlan->vid);
 639                         if (err)
 640                                 goto err_filt;
 641                 }
 642         }
 643
 644         oldproto = br->vlan_proto;
 645         br->vlan_proto = proto;
 646
 647         recalculate_group_addr(br);
 648         br_recalculate_fwd_mask(br);
 649
 650         /* Delete VLANs for the old proto from the device filter. */
 651         list_for_each_entry(p, &br->port_list, list)
 652                 list_for_each_entry(vlan, &p->vlgrp->vlan_list, vlist)
 653                         vlan_vid_del(p->dev, oldproto, vlan->vid);
 654
 655         return 0;
 656
 657 err_filt:
 658         list_for_each_entry_continue_reverse(vlan, &p->vlgrp->vlan_list, vlist)
 659                 vlan_vid_del(p->dev, proto, vlan->vid);
 660
 661         list_for_each_entry_continue_reverse(p, &br->port_list, list)
 662                 list_for_each_entry(vlan, &p->vlgrp->vlan_list, vlist)
 663                         vlan_vid_del(p->dev, proto, vlan->vid);
 664
 665         return err;
 666 }
 667
 668 int br_vlan_set_proto(struct net_bridge *br, unsigned long val)
 669 {
 670         int err;
 671
 672         if (val != ETH_P_8021Q && val != ETH_P_8021AD)
 673                 return -EPROTONOSUPPORT;
 674
 675         if (!rtnl_trylock())
 676                 return restart_syscall();
 677
 678         err = __br_vlan_set_proto(br, htons(val));
 679         rtnl_unlock();
 680
 681         return err;
 682 }
 683
 684 static bool vlan_default_pvid(struct net_bridge_vlan_group *vg, u16 vid)
 685 {
 686         struct net_bridge_vlan *v;
 687
 688         if (vid != vg->pvid)
 689                 return false;
 690
 691         v = br_vlan_lookup(&vg->vlan_hash, vid);
 692         if (v && br_vlan_should_use(v) &&
 693             (v->flags & BRIDGE_VLAN_INFO_UNTAGGED))
 694                 return true;
 695
 696         return false;
 697 }
 698
 699 static void br_vlan_disable_default_pvid(struct net_bridge *br)
 700 {
 701         struct net_bridge_port *p;
 702         u16 pvid = br->default_pvid;
 703
 704         /* Disable default_pvid on all ports where it is still
 705          * configured.
 706          */
 707         if (vlan_default_pvid(br->vlgrp, pvid))
 708                 br_vlan_delete(br, pvid);
 709
 710         list_for_each_entry(p, &br->port_list, list) {
 711                 if (vlan_default_pvid(p->vlgrp, pvid))
 712                         nbp_vlan_delete(p, pvid);
 713         }
 714
 715         br->default_pvid = 0;
 716 }
 717
 718 static int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid)
 719 {
 720         const struct net_bridge_vlan *pvent;
 721         struct net_bridge_port *p;
 722         u16 old_pvid;
 723         int err = 0;
 724         unsigned long *changed;
 725
 726         changed = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
 727                           GFP_KERNEL);
 728         if (!changed)
 729                 return -ENOMEM;
 730
 731         old_pvid = br->default_pvid;
 732
 733         /* Update default_pvid config only if we do not conflict with
 734          * user configuration.
 735          */
 736         pvent = br_vlan_find(br->vlgrp, pvid);
 737         if ((!old_pvid || vlan_default_pvid(br->vlgrp, old_pvid)) &&
 738             (!pvent || !br_vlan_should_use(pvent))) {
 739                 err = br_vlan_add(br, pvid,
 740                                   BRIDGE_VLAN_INFO_PVID |
 741                                   BRIDGE_VLAN_INFO_UNTAGGED |
 742                                   BRIDGE_VLAN_INFO_BRENTRY);
 743                 if (err)
 744                         goto out;
 745                 br_vlan_delete(br, old_pvid);
 746                 set_bit(0, changed);
 747         }
 748
 749         list_for_each_entry(p, &br->port_list, list) {
 750                 /* Update default_pvid config only if we do not conflict with
 751                  * user configuration.
 752                  */
 753                 if ((old_pvid &&
 754                      !vlan_default_pvid(p->vlgrp, old_pvid)) ||
 755                     br_vlan_find(p->vlgrp, pvid))
 756                         continue;
 757
 758                 err = nbp_vlan_add(p, pvid,
 759                                    BRIDGE_VLAN_INFO_PVID |
 760                                    BRIDGE_VLAN_INFO_UNTAGGED);
 761                 if (err)
 762                         goto err_port;
 763                 nbp_vlan_delete(p, old_pvid);
 764                 set_bit(p->port_no, changed);
 765         }
 766
 767         br->default_pvid = pvid;
 768
 769 out:
 770         kfree(changed);
 771         return err;
 772
 773 err_port:
 774         list_for_each_entry_continue_reverse(p, &br->port_list, list) {
 775                 if (!test_bit(p->port_no, changed))
 776                         continue;
 777
 778                 if (old_pvid)
 779                         nbp_vlan_add(p, old_pvid,
 780                                      BRIDGE_VLAN_INFO_PVID |
 781                                      BRIDGE_VLAN_INFO_UNTAGGED);
 782                 nbp_vlan_delete(p, pvid);
 783         }
 784
 785         if (test_bit(0, changed)) {
 786                 if (old_pvid)
 787                         br_vlan_add(br, old_pvid,
 788                                     BRIDGE_VLAN_INFO_PVID |
 789                                     BRIDGE_VLAN_INFO_UNTAGGED |
 790                                     BRIDGE_VLAN_INFO_BRENTRY);
 791                 br_vlan_delete(br, pvid);
 792         }
 793         goto out;
 794 }
 795
 796 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val)
 797 {
 798         u16 pvid = val;
 799         int err = 0;
 800
 801         if (val >= VLAN_VID_MASK)
 802                 return -EINVAL;
 803
 804         if (!rtnl_trylock())
 805                 return restart_syscall();
 806
 807         if (pvid == br->default_pvid)
 808                 goto unlock;
 809
 810         /* Only allow default pvid change when filtering is disabled */
 811         if (br->vlan_enabled) {
 812                 pr_info_once("Please disable vlan filtering to change default_pvid\n");
 813                 err = -EPERM;
 814                 goto unlock;
 815         }
 816
 817         if (!pvid)
 818                 br_vlan_disable_default_pvid(br);
 819         else
 820                 err = __br_vlan_set_default_pvid(br, pvid);
 821
 822 unlock:
 823         rtnl_unlock();
 824         return err;
 825 }
 826
 827 int br_vlan_init(struct net_bridge *br)
 828 {
 829         int ret = -ENOMEM;
 830
 831         br->vlgrp = kzalloc(sizeof(struct net_bridge_vlan_group), GFP_KERNEL);
 832         if (!br->vlgrp)
 833                 goto out;
 834         ret = rhashtable_init(&br->vlgrp->vlan_hash, &br_vlan_rht_params);
 835         if (ret)
 836                 goto err_rhtbl;
 837         INIT_LIST_HEAD(&br->vlgrp->vlan_list);
 838         br->vlan_proto = htons(ETH_P_8021Q);
 839         br->default_pvid = 1;
 840         ret = br_vlan_add(br, 1,
 841                           BRIDGE_VLAN_INFO_PVID | BRIDGE_VLAN_INFO_UNTAGGED |
 842                           BRIDGE_VLAN_INFO_BRENTRY);
 843         if (ret)
 844                 goto err_vlan_add;
 845
 846 out:
 847         return ret;
 848
 849 err_vlan_add:
 850         rhashtable_destroy(&br->vlgrp->vlan_hash);
 851 err_rhtbl:
 852         kfree(br->vlgrp);
 853
 854         goto out;
 855 }
 856
 857 int nbp_vlan_init(struct net_bridge_port *p)
 858 {
 859         struct net_bridge_vlan_group *vg;
 860         int ret = -ENOMEM;
 861
 862         vg = kzalloc(sizeof(struct net_bridge_vlan_group), GFP_KERNEL);
 863         if (!vg)
 864                 goto out;
 865
 866         ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params);
 867         if (ret)
 868                 goto err_rhtbl;
 869         INIT_LIST_HEAD(&vg->vlan_list);
 870         /* Make sure everything's committed before publishing vg */
 871         smp_wmb();
 872         p->vlgrp = vg;
 873         if (p->br->default_pvid) {
 874                 ret = nbp_vlan_add(p, p->br->default_pvid,
 875                                    BRIDGE_VLAN_INFO_PVID |
 876                                    BRIDGE_VLAN_INFO_UNTAGGED);
 877                 if (ret)
 878                         goto err_vlan_add;
 879         }
 880 out:
 881         return ret;
 882
 883 err_vlan_add:
 884         rhashtable_destroy(&vg->vlan_hash);
 885 err_rhtbl:
 886         kfree(vg);
 887
 888         goto out;
 889 }
 890
 891 /* Must be protected by RTNL.
 892  * Must be called with vid in range from 1 to 4094 inclusive.
 893  */
 894 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 895 {
 896         struct net_bridge_vlan *vlan;
 897         int ret;
 898
 899         ASSERT_RTNL();
 900
 901         vlan = br_vlan_find(port->vlgrp, vid);
 902         if (vlan) {
 903                 __vlan_add_flags(vlan, flags);
 904                 return 0;
 905         }
 906
 907         vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
 908         if (!vlan)
 909                 return -ENOMEM;
 910
 911         vlan->vid = vid;
 912         vlan->port = port;
 913         ret = __vlan_add(vlan, flags);
 914         if (ret)
 915                 kfree(vlan);
 916
 917         return ret;
 918 }
 919
 920 /* Must be protected by RTNL.
 921  * Must be called with vid in range from 1 to 4094 inclusive.
 922  */
 923 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 924 {
 925         struct net_bridge_vlan *v;
 926
 927         ASSERT_RTNL();
 928
 929         v = br_vlan_find(port->vlgrp, vid);
 930         if (!v)
 931                 return -ENOENT;
 932         br_fdb_find_delete_local(port->br, port, port->dev->dev_addr, vid);
 933         br_fdb_delete_by_port(port->br, port, vid, 0);
 934
 935         return __vlan_del(v);
 936 }
 937
 938 void nbp_vlan_flush(struct net_bridge_port *port)
 939 {
 940         struct net_bridge_vlan *vlan;
 941
 942         ASSERT_RTNL();
 943
 944         list_for_each_entry(vlan, &port->vlgrp->vlan_list, vlist)
 945                 vlan_vid_del(port->dev, port->br->vlan_proto, vlan->vid);
 946
 947         __vlan_flush(nbp_vlan_group(port));
 948 }