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         struct switchdev_obj_port_vlan v = {
  76                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
  77                 .flags = flags,
  78                 .vid_begin = vid,
  79                 .vid_end = vid,
  80         };
  81         int err;
  82
  83         /* Try switchdev op first. In case it is not supported, fallback to
  84          * 8021q add.
  85          */
  86         err = switchdev_port_obj_add(dev, &v.obj);
  87         if (err == -EOPNOTSUPP)
  88                 return vlan_vid_add(dev, br->vlan_proto, vid);
  89         return err;
  90 }
  91
  92 static void __vlan_add_list(struct net_bridge_vlan *v)
  93 {
  94         struct list_head *headp, *hpos;
  95         struct net_bridge_vlan *vent;
  96
  97         headp = br_vlan_is_master(v) ? &v->br->vlgrp->vlan_list :
  98                                        &v->port->vlgrp->vlan_list;
  99         list_for_each_prev(hpos, headp) {
 100                 vent = list_entry(hpos, struct net_bridge_vlan, vlist);
 101                 if (v->vid < vent->vid)
 102                         continue;
 103                 else
 104                         break;
 105         }
 106         list_add_rcu(&v->vlist, hpos);
 107 }
 108
 109 static void __vlan_del_list(struct net_bridge_vlan *v)
 110 {
 111         list_del_rcu(&v->vlist);
 112 }
 113
 114 static int __vlan_vid_del(struct net_device *dev, struct net_bridge *br,
 115                           u16 vid)
 116 {
 117         struct switchdev_obj_port_vlan v = {
 118                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
 119                 .vid_begin = vid,
 120                 .vid_end = vid,
 121         };
 122         int err;
 123
 124         /* Try switchdev op first. In case it is not supported, fallback to
 125          * 8021q del.
 126          */
 127         err = switchdev_port_obj_del(dev, &v.obj);
 128         if (err == -EOPNOTSUPP) {
 129                 vlan_vid_del(dev, br->vlan_proto, vid);
 130                 return 0;
 131         }
 132         return err;
 133 }
 134
 135 /* Returns a master vlan, if it didn't exist it gets created. In all cases a
 136  * a reference is taken to the master vlan before returning.
 137  */
 138 static struct net_bridge_vlan *br_vlan_get_master(struct net_bridge *br, u16 vid)
 139 {
 140         struct net_bridge_vlan *masterv;
 141
 142         masterv = br_vlan_find(br->vlgrp, vid);
 143         if (!masterv) {
 144                 /* missing global ctx, create it now */
 145                 if (br_vlan_add(br, vid, 0))
 146                         return NULL;
 147                 masterv = br_vlan_find(br->vlgrp, vid);
 148                 if (WARN_ON(!masterv))
 149                         return NULL;
 150         }
 151         atomic_inc(&masterv->refcnt);
 152
 153         return masterv;
 154 }
 155
 156 static void br_vlan_put_master(struct net_bridge_vlan *masterv)
 157 {
 158         if (!br_vlan_is_master(masterv))
 159                 return;
 160
 161         if (atomic_dec_and_test(&masterv->refcnt)) {
 162                 rhashtable_remove_fast(&masterv->br->vlgrp->vlan_hash,
 163                                        &masterv->vnode, br_vlan_rht_params);
 164                 __vlan_del_list(masterv);
 165                 kfree_rcu(masterv, rcu);
 166         }
 167 }
 168
 169 /* This is the shared VLAN add function which works for both ports and bridge
 170  * devices. There are four possible calls to this function in terms of the
 171  * vlan entry type:
 172  * 1. vlan is being added on a port (no master flags, global entry exists)
 173  * 2. vlan is being added on a bridge (both master and brvlan flags)
 174  * 3. vlan is being added on a port, but a global entry didn't exist which
 175  *    is being created right now (master flag set, brvlan flag unset), the
 176  *    global entry is used for global per-vlan features, but not for filtering
 177  * 4. same as 3 but with both master and brvlan flags set so the entry
 178  *    will be used for filtering in both the port and the bridge
 179  */
 180 static int __vlan_add(struct net_bridge_vlan *v, u16 flags)
 181 {
 182         struct net_bridge_vlan *masterv = NULL;
 183         struct net_bridge_port *p = NULL;
 184         struct net_bridge_vlan_group *vg;
 185         struct net_device *dev;
 186         struct net_bridge *br;
 187         int err;
 188
 189         if (br_vlan_is_master(v)) {
 190                 br = v->br;
 191                 dev = br->dev;
 192                 vg = br->vlgrp;
 193         } else {
 194                 p = v->port;
 195                 br = p->br;
 196                 dev = p->dev;
 197                 vg = p->vlgrp;
 198         }
 199
 200         if (p) {
 201                 /* Add VLAN to the device filter if it is supported.
 202                  * This ensures tagged traffic enters the bridge when
 203                  * promiscuous mode is disabled by br_manage_promisc().
 204                  */
 205                 err = __vlan_vid_add(dev, br, v->vid, flags);
 206                 if (err)
 207                         goto out;
 208
 209                 /* need to work on the master vlan too */
 210                 if (flags & BRIDGE_VLAN_INFO_MASTER) {
 211                         err = br_vlan_add(br, v->vid, flags |
 212                                                       BRIDGE_VLAN_INFO_BRENTRY);
 213                         if (err)
 214                                 goto out_filt;
 215                 }
 216
 217                 masterv = br_vlan_get_master(br, v->vid);
 218                 if (!masterv)
 219                         goto out_filt;
 220                 v->brvlan = masterv;
 221         }
 222
 223         /* Add the dev mac and count the vlan only if it's usable */
 224         if (br_vlan_should_use(v)) {
 225                 err = br_fdb_insert(br, p, dev->dev_addr, v->vid);
 226                 if (err) {
 227                         br_err(br, "failed insert local address into bridge forwarding table\n");
 228                         goto out_filt;
 229                 }
 230                 vg->num_vlans++;
 231         }
 232
 233         err = rhashtable_lookup_insert_fast(&vg->vlan_hash, &v->vnode,
 234                                             br_vlan_rht_params);
 235         if (err)
 236                 goto out_fdb_insert;
 237
 238         __vlan_add_list(v);
 239         __vlan_add_flags(v, flags);
 240 out:
 241         return err;
 242
 243 out_fdb_insert:
 244         if (br_vlan_should_use(v)) {
 245                 br_fdb_find_delete_local(br, p, dev->dev_addr, v->vid);
 246                 vg->num_vlans--;
 247         }
 248
 249 out_filt:
 250         if (p) {
 251                 __vlan_vid_del(dev, br, v->vid);
 252                 if (masterv) {
 253                         br_vlan_put_master(masterv);
 254                         v->brvlan = NULL;
 255                 }
 256         }
 257
 258         goto out;
 259 }
 260
 261 static int __vlan_del(struct net_bridge_vlan *v)
 262 {
 263         struct net_bridge_vlan *masterv = v;
 264         struct net_bridge_vlan_group *vg;
 265         struct net_bridge_port *p = NULL;
 266         int err = 0;
 267
 268         if (br_vlan_is_master(v)) {
 269                 vg = v->br->vlgrp;
 270         } else {
 271                 p = v->port;
 272                 vg = v->port->vlgrp;
 273                 masterv = v->brvlan;
 274         }
 275
 276         __vlan_delete_pvid(vg, v->vid);
 277         if (p) {
 278                 err = __vlan_vid_del(p->dev, p->br, v->vid);
 279                 if (err)
 280                         goto out;
 281         }
 282
 283         if (br_vlan_should_use(v)) {
 284                 v->flags &= ~BRIDGE_VLAN_INFO_BRENTRY;
 285                 vg->num_vlans--;
 286         }
 287
 288         if (masterv != v) {
 289                 rhashtable_remove_fast(&vg->vlan_hash, &v->vnode,
 290                                        br_vlan_rht_params);
 291                 __vlan_del_list(v);
 292                 kfree_rcu(v, rcu);
 293         }
 294
 295         br_vlan_put_master(masterv);
 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         br_fdb_delete_by_port(br, NULL, vid, 0);
 554
 555         return __vlan_del(v);
 556 }
 557
 558 void br_vlan_flush(struct net_bridge *br)
 559 {
 560         ASSERT_RTNL();
 561
 562         __vlan_flush(br_vlan_group(br));
 563 }
 564
 565 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid)
 566 {
 567         if (!vg)
 568                 return NULL;
 569
 570         return br_vlan_lookup(&vg->vlan_hash, vid);
 571 }
 572
 573 /* Must be protected by RTNL. */
 574 static void recalculate_group_addr(struct net_bridge *br)
 575 {
 576         if (br->group_addr_set)
 577                 return;
 578
 579         spin_lock_bh(&br->lock);
 580         if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q)) {
 581                 /* Bridge Group Address */
 582                 br->group_addr[5] = 0x00;
 583         } else { /* vlan_enabled && ETH_P_8021AD */
 584                 /* Provider Bridge Group Address */
 585                 br->group_addr[5] = 0x08;
 586         }
 587         spin_unlock_bh(&br->lock);
 588 }
 589
 590 /* Must be protected by RTNL. */
 591 void br_recalculate_fwd_mask(struct net_bridge *br)
 592 {
 593         if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q))
 594                 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
 595         else /* vlan_enabled && ETH_P_8021AD */
 596                 br->group_fwd_mask_required = BR_GROUPFWD_8021AD &
 597                                               ~(1u << br->group_addr[5]);
 598 }
 599
 600 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
 601 {
 602         if (br->vlan_enabled == val)
 603                 return 0;
 604
 605         br->vlan_enabled = val;
 606         br_manage_promisc(br);
 607         recalculate_group_addr(br);
 608         br_recalculate_fwd_mask(br);
 609
 610         return 0;
 611 }
 612
 613 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
 614 {
 615         if (!rtnl_trylock())
 616                 return restart_syscall();
 617
 618         __br_vlan_filter_toggle(br, val);
 619         rtnl_unlock();
 620
 621         return 0;
 622 }
 623
 624 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto)
 625 {
 626         int err = 0;
 627         struct net_bridge_port *p;
 628         struct net_bridge_vlan *vlan;
 629         __be16 oldproto;
 630
 631         if (br->vlan_proto == proto)
 632                 return 0;
 633
 634         /* Add VLANs for the new proto to the device filter. */
 635         list_for_each_entry(p, &br->port_list, list) {
 636                 list_for_each_entry(vlan, &p->vlgrp->vlan_list, vlist) {
 637                         err = vlan_vid_add(p->dev, proto, vlan->vid);
 638                         if (err)
 639                                 goto err_filt;
 640                 }
 641         }
 642
 643         oldproto = br->vlan_proto;
 644         br->vlan_proto = proto;
 645
 646         recalculate_group_addr(br);
 647         br_recalculate_fwd_mask(br);
 648
 649         /* Delete VLANs for the old proto from the device filter. */
 650         list_for_each_entry(p, &br->port_list, list)
 651                 list_for_each_entry(vlan, &p->vlgrp->vlan_list, vlist)
 652                         vlan_vid_del(p->dev, oldproto, vlan->vid);
 653
 654         return 0;
 655
 656 err_filt:
 657         list_for_each_entry_continue_reverse(vlan, &p->vlgrp->vlan_list, vlist)
 658                 vlan_vid_del(p->dev, proto, vlan->vid);
 659
 660         list_for_each_entry_continue_reverse(p, &br->port_list, list)
 661                 list_for_each_entry(vlan, &p->vlgrp->vlan_list, vlist)
 662                         vlan_vid_del(p->dev, proto, vlan->vid);
 663
 664         return err;
 665 }
 666
 667 int br_vlan_set_proto(struct net_bridge *br, unsigned long val)
 668 {
 669         int err;
 670
 671         if (val != ETH_P_8021Q && val != ETH_P_8021AD)
 672                 return -EPROTONOSUPPORT;
 673
 674         if (!rtnl_trylock())
 675                 return restart_syscall();
 676
 677         err = __br_vlan_set_proto(br, htons(val));
 678         rtnl_unlock();
 679
 680         return err;
 681 }
 682
 683 static bool vlan_default_pvid(struct net_bridge_vlan_group *vg, u16 vid)
 684 {
 685         struct net_bridge_vlan *v;
 686
 687         if (vid != vg->pvid)
 688                 return false;
 689
 690         v = br_vlan_lookup(&vg->vlan_hash, vid);
 691         if (v && br_vlan_should_use(v) &&
 692             (v->flags & BRIDGE_VLAN_INFO_UNTAGGED))
 693                 return true;
 694
 695         return false;
 696 }
 697
 698 static void br_vlan_disable_default_pvid(struct net_bridge *br)
 699 {
 700         struct net_bridge_port *p;
 701         u16 pvid = br->default_pvid;
 702
 703         /* Disable default_pvid on all ports where it is still
 704          * configured.
 705          */
 706         if (vlan_default_pvid(br->vlgrp, pvid))
 707                 br_vlan_delete(br, pvid);
 708
 709         list_for_each_entry(p, &br->port_list, list) {
 710                 if (vlan_default_pvid(p->vlgrp, pvid))
 711                         nbp_vlan_delete(p, pvid);
 712         }
 713
 714         br->default_pvid = 0;
 715 }
 716
 717 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid)
 718 {
 719         const struct net_bridge_vlan *pvent;
 720         struct net_bridge_port *p;
 721         u16 old_pvid;
 722         int err = 0;
 723         unsigned long *changed;
 724
 725         if (!pvid) {
 726                 br_vlan_disable_default_pvid(br);
 727                 return 0;
 728         }
 729
 730         changed = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
 731                           GFP_KERNEL);
 732         if (!changed)
 733                 return -ENOMEM;
 734
 735         old_pvid = br->default_pvid;
 736
 737         /* Update default_pvid config only if we do not conflict with
 738          * user configuration.
 739          */
 740         pvent = br_vlan_find(br->vlgrp, pvid);
 741         if ((!old_pvid || vlan_default_pvid(br->vlgrp, old_pvid)) &&
 742             (!pvent || !br_vlan_should_use(pvent))) {
 743                 err = br_vlan_add(br, pvid,
 744                                   BRIDGE_VLAN_INFO_PVID |
 745                                   BRIDGE_VLAN_INFO_UNTAGGED |
 746                                   BRIDGE_VLAN_INFO_BRENTRY);
 747                 if (err)
 748                         goto out;
 749                 br_vlan_delete(br, old_pvid);
 750                 set_bit(0, changed);
 751         }
 752
 753         list_for_each_entry(p, &br->port_list, list) {
 754                 /* Update default_pvid config only if we do not conflict with
 755                  * user configuration.
 756                  */
 757                 if ((old_pvid &&
 758                      !vlan_default_pvid(p->vlgrp, old_pvid)) ||
 759                     br_vlan_find(p->vlgrp, pvid))
 760                         continue;
 761
 762                 err = nbp_vlan_add(p, pvid,
 763                                    BRIDGE_VLAN_INFO_PVID |
 764                                    BRIDGE_VLAN_INFO_UNTAGGED);
 765                 if (err)
 766                         goto err_port;
 767                 nbp_vlan_delete(p, old_pvid);
 768                 set_bit(p->port_no, changed);
 769         }
 770
 771         br->default_pvid = pvid;
 772
 773 out:
 774         kfree(changed);
 775         return err;
 776
 777 err_port:
 778         list_for_each_entry_continue_reverse(p, &br->port_list, list) {
 779                 if (!test_bit(p->port_no, changed))
 780                         continue;
 781
 782                 if (old_pvid)
 783                         nbp_vlan_add(p, old_pvid,
 784                                      BRIDGE_VLAN_INFO_PVID |
 785                                      BRIDGE_VLAN_INFO_UNTAGGED);
 786                 nbp_vlan_delete(p, pvid);
 787         }
 788
 789         if (test_bit(0, changed)) {
 790                 if (old_pvid)
 791                         br_vlan_add(br, old_pvid,
 792                                     BRIDGE_VLAN_INFO_PVID |
 793                                     BRIDGE_VLAN_INFO_UNTAGGED |
 794                                     BRIDGE_VLAN_INFO_BRENTRY);
 795                 br_vlan_delete(br, pvid);
 796         }
 797         goto out;
 798 }
 799
 800 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val)
 801 {
 802         u16 pvid = val;
 803         int err = 0;
 804
 805         if (val >= VLAN_VID_MASK)
 806                 return -EINVAL;
 807
 808         if (!rtnl_trylock())
 809                 return restart_syscall();
 810
 811         if (pvid == br->default_pvid)
 812                 goto unlock;
 813
 814         /* Only allow default pvid change when filtering is disabled */
 815         if (br->vlan_enabled) {
 816                 pr_info_once("Please disable vlan filtering to change default_pvid\n");
 817                 err = -EPERM;
 818                 goto unlock;
 819         }
 820         err = __br_vlan_set_default_pvid(br, pvid);
 821 unlock:
 822         rtnl_unlock();
 823         return err;
 824 }
 825
 826 int br_vlan_init(struct net_bridge *br)
 827 {
 828         int ret = -ENOMEM;
 829
 830         br->vlgrp = kzalloc(sizeof(struct net_bridge_vlan_group), GFP_KERNEL);
 831         if (!br->vlgrp)
 832                 goto out;
 833         ret = rhashtable_init(&br->vlgrp->vlan_hash, &br_vlan_rht_params);
 834         if (ret)
 835                 goto err_rhtbl;
 836         INIT_LIST_HEAD(&br->vlgrp->vlan_list);
 837         br->vlan_proto = htons(ETH_P_8021Q);
 838         br->default_pvid = 1;
 839         ret = br_vlan_add(br, 1,
 840                           BRIDGE_VLAN_INFO_PVID | BRIDGE_VLAN_INFO_UNTAGGED |
 841                           BRIDGE_VLAN_INFO_BRENTRY);
 842         if (ret)
 843                 goto err_vlan_add;
 844
 845 out:
 846         return ret;
 847
 848 err_vlan_add:
 849         rhashtable_destroy(&br->vlgrp->vlan_hash);
 850 err_rhtbl:
 851         kfree(br->vlgrp);
 852
 853         goto out;
 854 }
 855
 856 int nbp_vlan_init(struct net_bridge_port *p)
 857 {
 858         struct net_bridge_vlan_group *vg;
 859         int ret = -ENOMEM;
 860
 861         vg = kzalloc(sizeof(struct net_bridge_vlan_group), GFP_KERNEL);
 862         if (!vg)
 863                 goto out;
 864
 865         ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params);
 866         if (ret)
 867                 goto err_rhtbl;
 868         INIT_LIST_HEAD(&vg->vlan_list);
 869         /* Make sure everything's committed before publishing vg */
 870         smp_wmb();
 871         p->vlgrp = vg;
 872         if (p->br->default_pvid) {
 873                 ret = nbp_vlan_add(p, p->br->default_pvid,
 874                                    BRIDGE_VLAN_INFO_PVID |
 875                                    BRIDGE_VLAN_INFO_UNTAGGED);
 876                 if (ret)
 877                         goto err_vlan_add;
 878         }
 879 out:
 880         return ret;
 881
 882 err_vlan_add:
 883         rhashtable_destroy(&vg->vlan_hash);
 884 err_rhtbl:
 885         kfree(vg);
 886
 887         goto out;
 888 }
 889
 890 /* Must be protected by RTNL.
 891  * Must be called with vid in range from 1 to 4094 inclusive.
 892  */
 893 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 894 {
 895         struct net_bridge_vlan *vlan;
 896         int ret;
 897
 898         ASSERT_RTNL();
 899
 900         vlan = br_vlan_find(port->vlgrp, vid);
 901         if (vlan) {
 902                 __vlan_add_flags(vlan, flags);
 903                 return 0;
 904         }
 905
 906         vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
 907         if (!vlan)
 908                 return -ENOMEM;
 909
 910         vlan->vid = vid;
 911         vlan->port = port;
 912         ret = __vlan_add(vlan, flags);
 913         if (ret)
 914                 kfree(vlan);
 915
 916         return ret;
 917 }
 918
 919 /* Must be protected by RTNL.
 920  * Must be called with vid in range from 1 to 4094 inclusive.
 921  */
 922 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 923 {
 924         struct net_bridge_vlan *v;
 925
 926         ASSERT_RTNL();
 927
 928         v = br_vlan_find(port->vlgrp, vid);
 929         if (!v)
 930                 return -ENOENT;
 931         br_fdb_find_delete_local(port->br, port, port->dev->dev_addr, vid);
 932         br_fdb_delete_by_port(port->br, port, vid, 0);
 933
 934         return __vlan_del(v);
 935 }
 936
 937 void nbp_vlan_flush(struct net_bridge_port *port)
 938 {
 939         struct net_bridge_vlan *vlan;
 940
 941         ASSERT_RTNL();
 942
 943         list_for_each_entry(vlan, &port->vlgrp->vlan_list, vlist)
 944                 vlan_vid_del(port->dev, port->br->vlan_proto, vlan->vid);
 945
 946         __vlan_flush(nbp_vlan_group(port));
 947 }