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 #include "br_private_tunnel.h"
   9
  10 static inline int br_vlan_cmp(struct rhashtable_compare_arg *arg,
  11                               const void *ptr)
  12 {
  13         const struct net_bridge_vlan *vle = ptr;
  14         u16 vid = *(u16 *)arg->key;
  15
  16         return vle->vid != vid;
  17 }
  18
  19 static const struct rhashtable_params br_vlan_rht_params = {
  20         .head_offset = offsetof(struct net_bridge_vlan, vnode),
  21         .key_offset = offsetof(struct net_bridge_vlan, vid),
  22         .key_len = sizeof(u16),
  23         .nelem_hint = 3,
  24         .locks_mul = 1,
  25         .max_size = VLAN_N_VID,
  26         .obj_cmpfn = br_vlan_cmp,
  27         .automatic_shrinking = true,
  28 };
  29
  30 static struct net_bridge_vlan *br_vlan_lookup(struct rhashtable *tbl, u16 vid)
  31 {
  32         return rhashtable_lookup_fast(tbl, &vid, br_vlan_rht_params);
  33 }
  34
  35 static bool __vlan_add_pvid(struct net_bridge_vlan_group *vg, u16 vid)
  36 {
  37         if (vg->pvid == vid)
  38                 return false;
  39
  40         smp_wmb();
  41         vg->pvid = vid;
  42
  43         return true;
  44 }
  45
  46 static bool __vlan_delete_pvid(struct net_bridge_vlan_group *vg, u16 vid)
  47 {
  48         if (vg->pvid != vid)
  49                 return false;
  50
  51         smp_wmb();
  52         vg->pvid = 0;
  53
  54         return true;
  55 }
  56
  57 /* return true if anything changed, false otherwise */
  58 static bool __vlan_add_flags(struct net_bridge_vlan *v, u16 flags)
  59 {
  60         struct net_bridge_vlan_group *vg;
  61         u16 old_flags = v->flags;
  62         bool ret;
  63
  64         if (br_vlan_is_master(v))
  65                 vg = br_vlan_group(v->br);
  66         else
  67                 vg = nbp_vlan_group(v->port);
  68
  69         if (flags & BRIDGE_VLAN_INFO_PVID)
  70                 ret = __vlan_add_pvid(vg, v->vid);
  71         else
  72                 ret = __vlan_delete_pvid(vg, v->vid);
  73
  74         if (flags & BRIDGE_VLAN_INFO_UNTAGGED)
  75                 v->flags |= BRIDGE_VLAN_INFO_UNTAGGED;
  76         else
  77                 v->flags &= ~BRIDGE_VLAN_INFO_UNTAGGED;
  78
  79         return ret || !!(old_flags ^ v->flags);
  80 }
  81
  82 static int __vlan_vid_add(struct net_device *dev, struct net_bridge *br,
  83                           u16 vid, u16 flags)
  84 {
  85         struct switchdev_obj_port_vlan v = {
  86                 .obj.orig_dev = dev,
  87                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
  88                 .flags = flags,
  89                 .vid_begin = vid,
  90                 .vid_end = vid,
  91         };
  92         int err;
  93
  94         /* Try switchdev op first. In case it is not supported, fallback to
  95          * 8021q add.
  96          */
  97         err = switchdev_port_obj_add(dev, &v.obj);
  98         if (err == -EOPNOTSUPP)
  99                 return vlan_vid_add(dev, br->vlan_proto, vid);
 100         return err;
 101 }
 102
 103 static void __vlan_add_list(struct net_bridge_vlan *v)
 104 {
 105         struct net_bridge_vlan_group *vg;
 106         struct list_head *headp, *hpos;
 107         struct net_bridge_vlan *vent;
 108
 109         if (br_vlan_is_master(v))
 110                 vg = br_vlan_group(v->br);
 111         else
 112                 vg = nbp_vlan_group(v->port);
 113
 114         headp = &vg->vlan_list;
 115         list_for_each_prev(hpos, headp) {
 116                 vent = list_entry(hpos, struct net_bridge_vlan, vlist);
 117                 if (v->vid < vent->vid)
 118                         continue;
 119                 else
 120                         break;
 121         }
 122         list_add_rcu(&v->vlist, hpos);
 123 }
 124
 125 static void __vlan_del_list(struct net_bridge_vlan *v)
 126 {
 127         list_del_rcu(&v->vlist);
 128 }
 129
 130 static int __vlan_vid_del(struct net_device *dev, struct net_bridge *br,
 131                           u16 vid)
 132 {
 133         struct switchdev_obj_port_vlan v = {
 134                 .obj.orig_dev = dev,
 135                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
 136                 .vid_begin = vid,
 137                 .vid_end = vid,
 138         };
 139         int err;
 140
 141         /* Try switchdev op first. In case it is not supported, fallback to
 142          * 8021q del.
 143          */
 144         err = switchdev_port_obj_del(dev, &v.obj);
 145         if (err == -EOPNOTSUPP) {
 146                 vlan_vid_del(dev, br->vlan_proto, vid);
 147                 return 0;
 148         }
 149         return err;
 150 }
 151
 152 /* Returns a master vlan, if it didn't exist it gets created. In all cases a
 153  * a reference is taken to the master vlan before returning.
 154  */
 155 static struct net_bridge_vlan *br_vlan_get_master(struct net_bridge *br, u16 vid)
 156 {
 157         struct net_bridge_vlan_group *vg;
 158         struct net_bridge_vlan *masterv;
 159
 160         vg = br_vlan_group(br);
 161         masterv = br_vlan_find(vg, vid);
 162         if (!masterv) {
 163                 bool changed;
 164
 165                 /* missing global ctx, create it now */
 166                 if (br_vlan_add(br, vid, 0, &changed))
 167                         return NULL;
 168                 masterv = br_vlan_find(vg, vid);
 169                 if (WARN_ON(!masterv))
 170                         return NULL;
 171                 refcount_set(&masterv->refcnt, 1);
 172                 return masterv;
 173         }
 174         refcount_inc(&masterv->refcnt);
 175
 176         return masterv;
 177 }
 178
 179 static void br_master_vlan_rcu_free(struct rcu_head *rcu)
 180 {
 181         struct net_bridge_vlan *v;
 182
 183         v = container_of(rcu, struct net_bridge_vlan, rcu);
 184         WARN_ON(!br_vlan_is_master(v));
 185         free_percpu(v->stats);
 186         v->stats = NULL;
 187         kfree(v);
 188 }
 189
 190 static void br_vlan_put_master(struct net_bridge_vlan *masterv)
 191 {
 192         struct net_bridge_vlan_group *vg;
 193
 194         if (!br_vlan_is_master(masterv))
 195                 return;
 196
 197         vg = br_vlan_group(masterv->br);
 198         if (refcount_dec_and_test(&masterv->refcnt)) {
 199                 rhashtable_remove_fast(&vg->vlan_hash,
 200                                        &masterv->vnode, br_vlan_rht_params);
 201                 __vlan_del_list(masterv);
 202                 call_rcu(&masterv->rcu, br_master_vlan_rcu_free);
 203         }
 204 }
 205
 206 /* This is the shared VLAN add function which works for both ports and bridge
 207  * devices. There are four possible calls to this function in terms of the
 208  * vlan entry type:
 209  * 1. vlan is being added on a port (no master flags, global entry exists)
 210  * 2. vlan is being added on a bridge (both master and brentry flags)
 211  * 3. vlan is being added on a port, but a global entry didn't exist which
 212  *    is being created right now (master flag set, brentry flag unset), the
 213  *    global entry is used for global per-vlan features, but not for filtering
 214  * 4. same as 3 but with both master and brentry flags set so the entry
 215  *    will be used for filtering in both the port and the bridge
 216  */
 217 static int __vlan_add(struct net_bridge_vlan *v, u16 flags)
 218 {
 219         struct net_bridge_vlan *masterv = NULL;
 220         struct net_bridge_port *p = NULL;
 221         struct net_bridge_vlan_group *vg;
 222         struct net_device *dev;
 223         struct net_bridge *br;
 224         int err;
 225
 226         if (br_vlan_is_master(v)) {
 227                 br = v->br;
 228                 dev = br->dev;
 229                 vg = br_vlan_group(br);
 230         } else {
 231                 p = v->port;
 232                 br = p->br;
 233                 dev = p->dev;
 234                 vg = nbp_vlan_group(p);
 235         }
 236
 237         if (p) {
 238                 /* Add VLAN to the device filter if it is supported.
 239                  * This ensures tagged traffic enters the bridge when
 240                  * promiscuous mode is disabled by br_manage_promisc().
 241                  */
 242                 err = __vlan_vid_add(dev, br, v->vid, flags);
 243                 if (err)
 244                         goto out;
 245
 246                 /* need to work on the master vlan too */
 247                 if (flags & BRIDGE_VLAN_INFO_MASTER) {
 248                         bool changed;
 249
 250                         err = br_vlan_add(br, v->vid,
 251                                           flags | BRIDGE_VLAN_INFO_BRENTRY,
 252                                           &changed);
 253                         if (err)
 254                                 goto out_filt;
 255                 }
 256
 257                 masterv = br_vlan_get_master(br, v->vid);
 258                 if (!masterv)
 259                         goto out_filt;
 260                 v->brvlan = masterv;
 261                 v->stats = masterv->stats;
 262         }
 263
 264         /* Add the dev mac and count the vlan only if it's usable */
 265         if (br_vlan_should_use(v)) {
 266                 err = br_fdb_insert(br, p, dev->dev_addr, v->vid);
 267                 if (err) {
 268                         br_err(br, "failed insert local address into bridge forwarding table\n");
 269                         goto out_filt;
 270                 }
 271                 vg->num_vlans++;
 272         }
 273
 274         err = rhashtable_lookup_insert_fast(&vg->vlan_hash, &v->vnode,
 275                                             br_vlan_rht_params);
 276         if (err)
 277                 goto out_fdb_insert;
 278
 279         __vlan_add_list(v);
 280         __vlan_add_flags(v, flags);
 281 out:
 282         return err;
 283
 284 out_fdb_insert:
 285         if (br_vlan_should_use(v)) {
 286                 br_fdb_find_delete_local(br, p, dev->dev_addr, v->vid);
 287                 vg->num_vlans--;
 288         }
 289
 290 out_filt:
 291         if (p) {
 292                 __vlan_vid_del(dev, br, v->vid);
 293                 if (masterv) {
 294                         br_vlan_put_master(masterv);
 295                         v->brvlan = NULL;
 296                 }
 297         }
 298
 299         goto out;
 300 }
 301
 302 static int __vlan_del(struct net_bridge_vlan *v)
 303 {
 304         struct net_bridge_vlan *masterv = v;
 305         struct net_bridge_vlan_group *vg;
 306         struct net_bridge_port *p = NULL;
 307         int err = 0;
 308
 309         if (br_vlan_is_master(v)) {
 310                 vg = br_vlan_group(v->br);
 311         } else {
 312                 p = v->port;
 313                 vg = nbp_vlan_group(v->port);
 314                 masterv = v->brvlan;
 315         }
 316
 317         __vlan_delete_pvid(vg, v->vid);
 318         if (p) {
 319                 err = __vlan_vid_del(p->dev, p->br, v->vid);
 320                 if (err)
 321                         goto out;
 322         }
 323
 324         if (br_vlan_should_use(v)) {
 325                 v->flags &= ~BRIDGE_VLAN_INFO_BRENTRY;
 326                 vg->num_vlans--;
 327         }
 328
 329         if (masterv != v) {
 330                 vlan_tunnel_info_del(vg, v);
 331                 rhashtable_remove_fast(&vg->vlan_hash, &v->vnode,
 332                                        br_vlan_rht_params);
 333                 __vlan_del_list(v);
 334                 kfree_rcu(v, rcu);
 335         }
 336
 337         br_vlan_put_master(masterv);
 338 out:
 339         return err;
 340 }
 341
 342 static void __vlan_group_free(struct net_bridge_vlan_group *vg)
 343 {
 344         WARN_ON(!list_empty(&vg->vlan_list));
 345         rhashtable_destroy(&vg->vlan_hash);
 346         vlan_tunnel_deinit(vg);
 347         kfree(vg);
 348 }
 349
 350 static void __vlan_flush(struct net_bridge_vlan_group *vg)
 351 {
 352         struct net_bridge_vlan *vlan, *tmp;
 353
 354         __vlan_delete_pvid(vg, vg->pvid);
 355         list_for_each_entry_safe(vlan, tmp, &vg->vlan_list, vlist)
 356                 __vlan_del(vlan);
 357 }
 358
 359 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 360                                const struct net_bridge_port *p,
 361                                struct net_bridge_vlan_group *vg,
 362                                struct sk_buff *skb)
 363 {
 364         struct br_vlan_stats *stats;
 365         struct net_bridge_vlan *v;
 366         u16 vid;
 367
 368         /* If this packet was not filtered at input, let it pass */
 369         if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
 370                 goto out;
 371
 372         /* At this point, we know that the frame was filtered and contains
 373          * a valid vlan id.  If the vlan id has untagged flag set,
 374          * send untagged; otherwise, send tagged.
 375          */
 376         br_vlan_get_tag(skb, &vid);
 377         v = br_vlan_find(vg, vid);
 378         /* Vlan entry must be configured at this point.  The
 379          * only exception is the bridge is set in promisc mode and the
 380          * packet is destined for the bridge device.  In this case
 381          * pass the packet as is.
 382          */
 383         if (!v || !br_vlan_should_use(v)) {
 384                 if ((br->dev->flags & IFF_PROMISC) && skb->dev == br->dev) {
 385                         goto out;
 386                 } else {
 387                         kfree_skb(skb);
 388                         return NULL;
 389                 }
 390         }
 391         if (br_opt_get(br, BROPT_VLAN_STATS_ENABLED)) {
 392                 stats = this_cpu_ptr(v->stats);
 393                 u64_stats_update_begin(&stats->syncp);
 394                 stats->tx_bytes += skb->len;
 395                 stats->tx_packets++;
 396                 u64_stats_update_end(&stats->syncp);
 397         }
 398
 399         if (v->flags & BRIDGE_VLAN_INFO_UNTAGGED)
 400                 skb->vlan_tci = 0;
 401
 402         if (p && (p->flags & BR_VLAN_TUNNEL) &&
 403             br_handle_egress_vlan_tunnel(skb, v)) {
 404                 kfree_skb(skb);
 405                 return NULL;
 406         }
 407 out:
 408         return skb;
 409 }
 410
 411 /* Called under RCU */
 412 static bool __allowed_ingress(const struct net_bridge *br,
 413                               struct net_bridge_vlan_group *vg,
 414                               struct sk_buff *skb, u16 *vid)
 415 {
 416         struct br_vlan_stats *stats;
 417         struct net_bridge_vlan *v;
 418         bool tagged;
 419
 420         BR_INPUT_SKB_CB(skb)->vlan_filtered = true;
 421         /* If vlan tx offload is disabled on bridge device and frame was
 422          * sent from vlan device on the bridge device, it does not have
 423          * HW accelerated vlan tag.
 424          */
 425         if (unlikely(!skb_vlan_tag_present(skb) &&
 426                      skb->protocol == br->vlan_proto)) {
 427                 skb = skb_vlan_untag(skb);
 428                 if (unlikely(!skb))
 429                         return false;
 430         }
 431
 432         if (!br_vlan_get_tag(skb, vid)) {
 433                 /* Tagged frame */
 434                 if (skb->vlan_proto != br->vlan_proto) {
 435                         /* Protocol-mismatch, empty out vlan_tci for new tag */
 436                         skb_push(skb, ETH_HLEN);
 437                         skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto,
 438                                                         skb_vlan_tag_get(skb));
 439                         if (unlikely(!skb))
 440                                 return false;
 441
 442                         skb_pull(skb, ETH_HLEN);
 443                         skb_reset_mac_len(skb);
 444                         *vid = 0;
 445                         tagged = false;
 446                 } else {
 447                         tagged = true;
 448                 }
 449         } else {
 450                 /* Untagged frame */
 451                 tagged = false;
 452         }
 453
 454         if (!*vid) {
 455                 u16 pvid = br_get_pvid(vg);
 456
 457                 /* Frame had a tag with VID 0 or did not have a tag.
 458                  * See if pvid is set on this port.  That tells us which
 459                  * vlan untagged or priority-tagged traffic belongs to.
 460                  */
 461                 if (!pvid)
 462                         goto drop;
 463
 464                 /* PVID is set on this port.  Any untagged or priority-tagged
 465                  * ingress frame is considered to belong to this vlan.
 466                  */
 467                 *vid = pvid;
 468                 if (likely(!tagged))
 469                         /* Untagged Frame. */
 470                         __vlan_hwaccel_put_tag(skb, br->vlan_proto, pvid);
 471                 else
 472                         /* Priority-tagged Frame.
 473                          * At this point, We know that skb->vlan_tci had
 474                          * VLAN_TAG_PRESENT bit and its VID field was 0x000.
 475                          * We update only VID field and preserve PCP field.
 476                          */
 477                         skb->vlan_tci |= pvid;
 478
 479                 /* if stats are disabled we can avoid the lookup */
 480                 if (!br_opt_get(br, BROPT_VLAN_STATS_ENABLED))
 481                         return true;
 482         }
 483         v = br_vlan_find(vg, *vid);
 484         if (!v || !br_vlan_should_use(v))
 485                 goto drop;
 486
 487         if (br_opt_get(br, BROPT_VLAN_STATS_ENABLED)) {
 488                 stats = this_cpu_ptr(v->stats);
 489                 u64_stats_update_begin(&stats->syncp);
 490                 stats->rx_bytes += skb->len;
 491                 stats->rx_packets++;
 492                 u64_stats_update_end(&stats->syncp);
 493         }
 494
 495         return true;
 496
 497 drop:
 498         kfree_skb(skb);
 499         return false;
 500 }
 501
 502 bool br_allowed_ingress(const struct net_bridge *br,
 503                         struct net_bridge_vlan_group *vg, struct sk_buff *skb,
 504                         u16 *vid)
 505 {
 506         /* If VLAN filtering is disabled on the bridge, all packets are
 507          * permitted.
 508          */
 509         if (!br_opt_get(br, BROPT_VLAN_ENABLED)) {
 510                 BR_INPUT_SKB_CB(skb)->vlan_filtered = false;
 511                 return true;
 512         }
 513
 514         return __allowed_ingress(br, vg, skb, vid);
 515 }
 516
 517 /* Called under RCU. */
 518 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 519                        const struct sk_buff *skb)
 520 {
 521         const struct net_bridge_vlan *v;
 522         u16 vid;
 523
 524         /* If this packet was not filtered at input, let it pass */
 525         if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
 526                 return true;
 527
 528         br_vlan_get_tag(skb, &vid);
 529         v = br_vlan_find(vg, vid);
 530         if (v && br_vlan_should_use(v))
 531                 return true;
 532
 533         return false;
 534 }
 535
 536 /* Called under RCU */
 537 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid)
 538 {
 539         struct net_bridge_vlan_group *vg;
 540         struct net_bridge *br = p->br;
 541
 542         /* If filtering was disabled at input, let it pass. */
 543         if (!br_opt_get(br, BROPT_VLAN_ENABLED))
 544                 return true;
 545
 546         vg = nbp_vlan_group_rcu(p);
 547         if (!vg || !vg->num_vlans)
 548                 return false;
 549
 550         if (!br_vlan_get_tag(skb, vid) && skb->vlan_proto != br->vlan_proto)
 551                 *vid = 0;
 552
 553         if (!*vid) {
 554                 *vid = br_get_pvid(vg);
 555                 if (!*vid)
 556                         return false;
 557
 558                 return true;
 559         }
 560
 561         if (br_vlan_find(vg, *vid))
 562                 return true;
 563
 564         return false;
 565 }
 566
 567 /* Must be protected by RTNL.
 568  * Must be called with vid in range from 1 to 4094 inclusive.
 569  * changed must be true only if the vlan was created or updated
 570  */
 571 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, bool *changed)
 572 {
 573         struct net_bridge_vlan_group *vg;
 574         struct net_bridge_vlan *vlan;
 575         int ret;
 576
 577         ASSERT_RTNL();
 578
 579         *changed = false;
 580         vg = br_vlan_group(br);
 581         vlan = br_vlan_find(vg, vid);
 582         if (vlan) {
 583                 if (!br_vlan_is_brentry(vlan)) {
 584                         /* Trying to change flags of non-existent bridge vlan */
 585                         if (!(flags & BRIDGE_VLAN_INFO_BRENTRY))
 586                                 return -EINVAL;
 587                         /* It was only kept for port vlans, now make it real */
 588                         ret = br_fdb_insert(br, NULL, br->dev->dev_addr,
 589                                             vlan->vid);
 590                         if (ret) {
 591                                 br_err(br, "failed insert local address into bridge forwarding table\n");
 592                                 return ret;
 593                         }
 594                         refcount_inc(&vlan->refcnt);
 595                         vlan->flags |= BRIDGE_VLAN_INFO_BRENTRY;
 596                         vg->num_vlans++;
 597                         *changed = true;
 598                 }
 599                 if (__vlan_add_flags(vlan, flags))
 600                         *changed = true;
 601
 602                 return 0;
 603         }
 604
 605         vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
 606         if (!vlan)
 607                 return -ENOMEM;
 608
 609         vlan->stats = netdev_alloc_pcpu_stats(struct br_vlan_stats);
 610         if (!vlan->stats) {
 611                 kfree(vlan);
 612                 return -ENOMEM;
 613         }
 614         vlan->vid = vid;
 615         vlan->flags = flags | BRIDGE_VLAN_INFO_MASTER;
 616         vlan->flags &= ~BRIDGE_VLAN_INFO_PVID;
 617         vlan->br = br;
 618         if (flags & BRIDGE_VLAN_INFO_BRENTRY)
 619                 refcount_set(&vlan->refcnt, 1);
 620         ret = __vlan_add(vlan, flags);
 621         if (ret) {
 622                 free_percpu(vlan->stats);
 623                 kfree(vlan);
 624         } else {
 625                 *changed = true;
 626         }
 627
 628         return ret;
 629 }
 630
 631 /* Must be protected by RTNL.
 632  * Must be called with vid in range from 1 to 4094 inclusive.
 633  */
 634 int br_vlan_delete(struct net_bridge *br, u16 vid)
 635 {
 636         struct net_bridge_vlan_group *vg;
 637         struct net_bridge_vlan *v;
 638
 639         ASSERT_RTNL();
 640
 641         vg = br_vlan_group(br);
 642         v = br_vlan_find(vg, vid);
 643         if (!v || !br_vlan_is_brentry(v))
 644                 return -ENOENT;
 645
 646         br_fdb_find_delete_local(br, NULL, br->dev->dev_addr, vid);
 647         br_fdb_delete_by_port(br, NULL, vid, 0);
 648
 649         vlan_tunnel_info_del(vg, v);
 650
 651         return __vlan_del(v);
 652 }
 653
 654 void br_vlan_flush(struct net_bridge *br)
 655 {
 656         struct net_bridge_vlan_group *vg;
 657
 658         ASSERT_RTNL();
 659
 660         /* delete auto-added default pvid local fdb before flushing vlans
 661          * otherwise it will be leaked on bridge device init failure
 662          */
 663         br_fdb_delete_by_port(br, NULL, 0, 1);
 664
 665         vg = br_vlan_group(br);
 666         __vlan_flush(vg);
 667         RCU_INIT_POINTER(br->vlgrp, NULL);
 668         synchronize_rcu();
 669         __vlan_group_free(vg);
 670 }
 671
 672 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid)
 673 {
 674         if (!vg)
 675                 return NULL;
 676
 677         return br_vlan_lookup(&vg->vlan_hash, vid);
 678 }
 679
 680 /* Must be protected by RTNL. */
 681 static void recalculate_group_addr(struct net_bridge *br)
 682 {
 683         if (br->group_addr_set)
 684                 return;
 685
 686         spin_lock_bh(&br->lock);
 687         if (!br_opt_get(br, BROPT_VLAN_ENABLED) ||
 688             br->vlan_proto == htons(ETH_P_8021Q)) {
 689                 /* Bridge Group Address */
 690                 br->group_addr[5] = 0x00;
 691         } else { /* vlan_enabled && ETH_P_8021AD */
 692                 /* Provider Bridge Group Address */
 693                 br->group_addr[5] = 0x08;
 694         }
 695         spin_unlock_bh(&br->lock);
 696 }
 697
 698 /* Must be protected by RTNL. */
 699 void br_recalculate_fwd_mask(struct net_bridge *br)
 700 {
 701         if (!br_opt_get(br, BROPT_VLAN_ENABLED) ||
 702             br->vlan_proto == htons(ETH_P_8021Q))
 703                 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
 704         else /* vlan_enabled && ETH_P_8021AD */
 705                 br->group_fwd_mask_required = BR_GROUPFWD_8021AD &
 706                                               ~(1u << br->group_addr[5]);
 707 }
 708
 709 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
 710 {
 711         struct switchdev_attr attr = {
 712                 .orig_dev = br->dev,
 713                 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
 714                 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
 715                 .u.vlan_filtering = val,
 716         };
 717         int err;
 718
 719         if (br_opt_get(br, BROPT_VLAN_ENABLED) == !!val)
 720                 return 0;
 721
 722         err = switchdev_port_attr_set(br->dev, &attr);
 723         if (err && err != -EOPNOTSUPP)
 724                 return err;
 725
 726         br_opt_toggle(br, BROPT_VLAN_ENABLED, !!val);
 727         br_manage_promisc(br);
 728         recalculate_group_addr(br);
 729         br_recalculate_fwd_mask(br);
 730
 731         return 0;
 732 }
 733
 734 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
 735 {
 736         return __br_vlan_filter_toggle(br, val);
 737 }
 738
 739 bool br_vlan_enabled(const struct net_device *dev)
 740 {
 741         struct net_bridge *br = netdev_priv(dev);
 742
 743         return br_opt_get(br, BROPT_VLAN_ENABLED);
 744 }
 745 EXPORT_SYMBOL_GPL(br_vlan_enabled);
 746
 747 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto)
 748 {
 749         int err = 0;
 750         struct net_bridge_port *p;
 751         struct net_bridge_vlan *vlan;
 752         struct net_bridge_vlan_group *vg;
 753         __be16 oldproto;
 754
 755         if (br->vlan_proto == proto)
 756                 return 0;
 757
 758         /* Add VLANs for the new proto to the device filter. */
 759         list_for_each_entry(p, &br->port_list, list) {
 760                 vg = nbp_vlan_group(p);
 761                 list_for_each_entry(vlan, &vg->vlan_list, vlist) {
 762                         err = vlan_vid_add(p->dev, proto, vlan->vid);
 763                         if (err)
 764                                 goto err_filt;
 765                 }
 766         }
 767
 768         oldproto = br->vlan_proto;
 769         br->vlan_proto = proto;
 770
 771         recalculate_group_addr(br);
 772         br_recalculate_fwd_mask(br);
 773
 774         /* Delete VLANs for the old proto from the device filter. */
 775         list_for_each_entry(p, &br->port_list, list) {
 776                 vg = nbp_vlan_group(p);
 777                 list_for_each_entry(vlan, &vg->vlan_list, vlist)
 778                         vlan_vid_del(p->dev, oldproto, vlan->vid);
 779         }
 780
 781         return 0;
 782
 783 err_filt:
 784         list_for_each_entry_continue_reverse(vlan, &vg->vlan_list, vlist)
 785                 vlan_vid_del(p->dev, proto, vlan->vid);
 786
 787         list_for_each_entry_continue_reverse(p, &br->port_list, list) {
 788                 vg = nbp_vlan_group(p);
 789                 list_for_each_entry(vlan, &vg->vlan_list, vlist)
 790                         vlan_vid_del(p->dev, proto, vlan->vid);
 791         }
 792
 793         return err;
 794 }
 795
 796 int br_vlan_set_proto(struct net_bridge *br, unsigned long val)
 797 {
 798         if (val != ETH_P_8021Q && val != ETH_P_8021AD)
 799                 return -EPROTONOSUPPORT;
 800
 801         return __br_vlan_set_proto(br, htons(val));
 802 }
 803
 804 int br_vlan_set_stats(struct net_bridge *br, unsigned long val)
 805 {
 806         switch (val) {
 807         case 0:
 808         case 1:
 809                 br_opt_toggle(br, BROPT_VLAN_STATS_ENABLED, !!val);
 810                 break;
 811         default:
 812                 return -EINVAL;
 813         }
 814
 815         return 0;
 816 }
 817
 818 static bool vlan_default_pvid(struct net_bridge_vlan_group *vg, u16 vid)
 819 {
 820         struct net_bridge_vlan *v;
 821
 822         if (vid != vg->pvid)
 823                 return false;
 824
 825         v = br_vlan_lookup(&vg->vlan_hash, vid);
 826         if (v && br_vlan_should_use(v) &&
 827             (v->flags & BRIDGE_VLAN_INFO_UNTAGGED))
 828                 return true;
 829
 830         return false;
 831 }
 832
 833 static void br_vlan_disable_default_pvid(struct net_bridge *br)
 834 {
 835         struct net_bridge_port *p;
 836         u16 pvid = br->default_pvid;
 837
 838         /* Disable default_pvid on all ports where it is still
 839          * configured.
 840          */
 841         if (vlan_default_pvid(br_vlan_group(br), pvid))
 842                 br_vlan_delete(br, pvid);
 843
 844         list_for_each_entry(p, &br->port_list, list) {
 845                 if (vlan_default_pvid(nbp_vlan_group(p), pvid))
 846                         nbp_vlan_delete(p, pvid);
 847         }
 848
 849         br->default_pvid = 0;
 850 }
 851
 852 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid)
 853 {
 854         const struct net_bridge_vlan *pvent;
 855         struct net_bridge_vlan_group *vg;
 856         struct net_bridge_port *p;
 857         unsigned long *changed;
 858         bool vlchange;
 859         u16 old_pvid;
 860         int err = 0;
 861
 862         if (!pvid) {
 863                 br_vlan_disable_default_pvid(br);
 864                 return 0;
 865         }
 866
 867         changed = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
 868                           GFP_KERNEL);
 869         if (!changed)
 870                 return -ENOMEM;
 871
 872         old_pvid = br->default_pvid;
 873
 874         /* Update default_pvid config only if we do not conflict with
 875          * user configuration.
 876          */
 877         vg = br_vlan_group(br);
 878         pvent = br_vlan_find(vg, pvid);
 879         if ((!old_pvid || vlan_default_pvid(vg, old_pvid)) &&
 880             (!pvent || !br_vlan_should_use(pvent))) {
 881                 err = br_vlan_add(br, pvid,
 882                                   BRIDGE_VLAN_INFO_PVID |
 883                                   BRIDGE_VLAN_INFO_UNTAGGED |
 884                                   BRIDGE_VLAN_INFO_BRENTRY,
 885                                   &vlchange);
 886                 if (err)
 887                         goto out;
 888                 br_vlan_delete(br, old_pvid);
 889                 set_bit(0, changed);
 890         }
 891
 892         list_for_each_entry(p, &br->port_list, list) {
 893                 /* Update default_pvid config only if we do not conflict with
 894                  * user configuration.
 895                  */
 896                 vg = nbp_vlan_group(p);
 897                 if ((old_pvid &&
 898                      !vlan_default_pvid(vg, old_pvid)) ||
 899                     br_vlan_find(vg, pvid))
 900                         continue;
 901
 902                 err = nbp_vlan_add(p, pvid,
 903                                    BRIDGE_VLAN_INFO_PVID |
 904                                    BRIDGE_VLAN_INFO_UNTAGGED,
 905                                    &vlchange);
 906                 if (err)
 907                         goto err_port;
 908                 nbp_vlan_delete(p, old_pvid);
 909                 set_bit(p->port_no, changed);
 910         }
 911
 912         br->default_pvid = pvid;
 913
 914 out:
 915         kfree(changed);
 916         return err;
 917
 918 err_port:
 919         list_for_each_entry_continue_reverse(p, &br->port_list, list) {
 920                 if (!test_bit(p->port_no, changed))
 921                         continue;
 922
 923                 if (old_pvid)
 924                         nbp_vlan_add(p, old_pvid,
 925                                      BRIDGE_VLAN_INFO_PVID |
 926                                      BRIDGE_VLAN_INFO_UNTAGGED,
 927                                      &vlchange);
 928                 nbp_vlan_delete(p, pvid);
 929         }
 930
 931         if (test_bit(0, changed)) {
 932                 if (old_pvid)
 933                         br_vlan_add(br, old_pvid,
 934                                     BRIDGE_VLAN_INFO_PVID |
 935                                     BRIDGE_VLAN_INFO_UNTAGGED |
 936                                     BRIDGE_VLAN_INFO_BRENTRY,
 937                                     &vlchange);
 938                 br_vlan_delete(br, pvid);
 939         }
 940         goto out;
 941 }
 942
 943 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val)
 944 {
 945         u16 pvid = val;
 946         int err = 0;
 947
 948         if (val >= VLAN_VID_MASK)
 949                 return -EINVAL;
 950
 951         if (pvid == br->default_pvid)
 952                 goto out;
 953
 954         /* Only allow default pvid change when filtering is disabled */
 955         if (br_opt_get(br, BROPT_VLAN_ENABLED)) {
 956                 pr_info_once("Please disable vlan filtering to change default_pvid\n");
 957                 err = -EPERM;
 958                 goto out;
 959         }
 960         err = __br_vlan_set_default_pvid(br, pvid);
 961 out:
 962         return err;
 963 }
 964
 965 int br_vlan_init(struct net_bridge *br)
 966 {
 967         struct net_bridge_vlan_group *vg;
 968         int ret = -ENOMEM;
 969         bool changed;
 970
 971         vg = kzalloc(sizeof(*vg), GFP_KERNEL);
 972         if (!vg)
 973                 goto out;
 974         ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params);
 975         if (ret)
 976                 goto err_rhtbl;
 977         ret = vlan_tunnel_init(vg);
 978         if (ret)
 979                 goto err_tunnel_init;
 980         INIT_LIST_HEAD(&vg->vlan_list);
 981         br->vlan_proto = htons(ETH_P_8021Q);
 982         br->default_pvid = 1;
 983         rcu_assign_pointer(br->vlgrp, vg);
 984         ret = br_vlan_add(br, 1,
 985                           BRIDGE_VLAN_INFO_PVID | BRIDGE_VLAN_INFO_UNTAGGED |
 986                           BRIDGE_VLAN_INFO_BRENTRY, &changed);
 987         if (ret)
 988                 goto err_vlan_add;
 989
 990 out:
 991         return ret;
 992
 993 err_vlan_add:
 994         vlan_tunnel_deinit(vg);
 995 err_tunnel_init:
 996         rhashtable_destroy(&vg->vlan_hash);
 997 err_rhtbl:
 998         kfree(vg);
 999
1000         goto out;
1001 }
1002
1003 int nbp_vlan_init(struct net_bridge_port *p)
1004 {
1005         struct switchdev_attr attr = {
1006                 .orig_dev = p->br->dev,
1007                 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
1008                 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
1009                 .u.vlan_filtering = br_opt_get(p->br, BROPT_VLAN_ENABLED),
1010         };
1011         struct net_bridge_vlan_group *vg;
1012         int ret = -ENOMEM;
1013
1014         vg = kzalloc(sizeof(struct net_bridge_vlan_group), GFP_KERNEL);
1015         if (!vg)
1016                 goto out;
1017
1018         ret = switchdev_port_attr_set(p->dev, &attr);
1019         if (ret && ret != -EOPNOTSUPP)
1020                 goto err_vlan_enabled;
1021
1022         ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params);
1023         if (ret)
1024                 goto err_rhtbl;
1025         ret = vlan_tunnel_init(vg);
1026         if (ret)
1027                 goto err_tunnel_init;
1028         INIT_LIST_HEAD(&vg->vlan_list);
1029         rcu_assign_pointer(p->vlgrp, vg);
1030         if (p->br->default_pvid) {
1031                 bool changed;
1032
1033                 ret = nbp_vlan_add(p, p->br->default_pvid,
1034                                    BRIDGE_VLAN_INFO_PVID |
1035                                    BRIDGE_VLAN_INFO_UNTAGGED,
1036                                    &changed);
1037                 if (ret)
1038                         goto err_vlan_add;
1039         }
1040 out:
1041         return ret;
1042
1043 err_vlan_add:
1044         RCU_INIT_POINTER(p->vlgrp, NULL);
1045         synchronize_rcu();
1046         vlan_tunnel_deinit(vg);
1047 err_tunnel_init:
1048         rhashtable_destroy(&vg->vlan_hash);
1049 err_rhtbl:
1050 err_vlan_enabled:
1051         kfree(vg);
1052
1053         goto out;
1054 }
1055
1056 /* Must be protected by RTNL.
1057  * Must be called with vid in range from 1 to 4094 inclusive.
1058  * changed must be true only if the vlan was created or updated
1059  */
1060 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
1061                  bool *changed)
1062 {
1063         struct switchdev_obj_port_vlan v = {
1064                 .obj.orig_dev = port->dev,
1065                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
1066                 .flags = flags,
1067                 .vid_begin = vid,
1068                 .vid_end = vid,
1069         };
1070         struct net_bridge_vlan *vlan;
1071         int ret;
1072
1073         ASSERT_RTNL();
1074
1075         *changed = false;
1076         vlan = br_vlan_find(nbp_vlan_group(port), vid);
1077         if (vlan) {
1078                 /* Pass the flags to the hardware bridge */
1079                 ret = switchdev_port_obj_add(port->dev, &v.obj);
1080                 if (ret && ret != -EOPNOTSUPP)
1081                         return ret;
1082                 *changed = __vlan_add_flags(vlan, flags);
1083
1084                 return 0;
1085         }
1086
1087         vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
1088         if (!vlan)
1089                 return -ENOMEM;
1090
1091         vlan->vid = vid;
1092         vlan->port = port;
1093         ret = __vlan_add(vlan, flags);
1094         if (ret)
1095                 kfree(vlan);
1096         else
1097                 *changed = true;
1098
1099         return ret;
1100 }
1101
1102 /* Must be protected by RTNL.
1103  * Must be called with vid in range from 1 to 4094 inclusive.
1104  */
1105 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
1106 {
1107         struct net_bridge_vlan *v;
1108
1109         ASSERT_RTNL();
1110
1111         v = br_vlan_find(nbp_vlan_group(port), vid);
1112         if (!v)
1113                 return -ENOENT;
1114         br_fdb_find_delete_local(port->br, port, port->dev->dev_addr, vid);
1115         br_fdb_delete_by_port(port->br, port, vid, 0);
1116
1117         return __vlan_del(v);
1118 }
1119
1120 void nbp_vlan_flush(struct net_bridge_port *port)
1121 {
1122         struct net_bridge_vlan_group *vg;
1123
1124         ASSERT_RTNL();
1125
1126         vg = nbp_vlan_group(port);
1127         __vlan_flush(vg);
1128         RCU_INIT_POINTER(port->vlgrp, NULL);
1129         synchronize_rcu();
1130         __vlan_group_free(vg);
1131 }
1132
1133 void br_vlan_get_stats(const struct net_bridge_vlan *v,
1134                        struct br_vlan_stats *stats)
1135 {
1136         int i;
1137
1138         memset(stats, 0, sizeof(*stats));
1139         for_each_possible_cpu(i) {
1140                 u64 rxpackets, rxbytes, txpackets, txbytes;
1141                 struct br_vlan_stats *cpu_stats;
1142                 unsigned int start;
1143
1144                 cpu_stats = per_cpu_ptr(v->stats, i);
1145                 do {
1146                         start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1147                         rxpackets = cpu_stats->rx_packets;
1148                         rxbytes = cpu_stats->rx_bytes;
1149                         txbytes = cpu_stats->tx_bytes;
1150                         txpackets = cpu_stats->tx_packets;
1151                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
1152
1153                 stats->rx_packets += rxpackets;
1154                 stats->rx_bytes += rxbytes;
1155                 stats->tx_bytes += txbytes;
1156                 stats->tx_packets += txpackets;
1157         }
1158 }