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->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->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->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->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->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         vg = br_vlan_group(br);
 661         __vlan_flush(vg);
 662         RCU_INIT_POINTER(br->vlgrp, NULL);
 663         synchronize_rcu();
 664         __vlan_group_free(vg);
 665 }
 666
 667 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid)
 668 {
 669         if (!vg)
 670                 return NULL;
 671
 672         return br_vlan_lookup(&vg->vlan_hash, vid);
 673 }
 674
 675 /* Must be protected by RTNL. */
 676 static void recalculate_group_addr(struct net_bridge *br)
 677 {
 678         if (br->group_addr_set)
 679                 return;
 680
 681         spin_lock_bh(&br->lock);
 682         if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q)) {
 683                 /* Bridge Group Address */
 684                 br->group_addr[5] = 0x00;
 685         } else { /* vlan_enabled && ETH_P_8021AD */
 686                 /* Provider Bridge Group Address */
 687                 br->group_addr[5] = 0x08;
 688         }
 689         spin_unlock_bh(&br->lock);
 690 }
 691
 692 /* Must be protected by RTNL. */
 693 void br_recalculate_fwd_mask(struct net_bridge *br)
 694 {
 695         if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q))
 696                 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
 697         else /* vlan_enabled && ETH_P_8021AD */
 698                 br->group_fwd_mask_required = BR_GROUPFWD_8021AD &
 699                                               ~(1u << br->group_addr[5]);
 700 }
 701
 702 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
 703 {
 704         struct switchdev_attr attr = {
 705                 .orig_dev = br->dev,
 706                 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
 707                 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
 708                 .u.vlan_filtering = val,
 709         };
 710         int err;
 711
 712         if (br->vlan_enabled == val)
 713                 return 0;
 714
 715         err = switchdev_port_attr_set(br->dev, &attr);
 716         if (err && err != -EOPNOTSUPP)
 717                 return err;
 718
 719         br->vlan_enabled = val;
 720         br_manage_promisc(br);
 721         recalculate_group_addr(br);
 722         br_recalculate_fwd_mask(br);
 723
 724         return 0;
 725 }
 726
 727 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
 728 {
 729         return __br_vlan_filter_toggle(br, val);
 730 }
 731
 732 bool br_vlan_enabled(const struct net_device *dev)
 733 {
 734         struct net_bridge *br = netdev_priv(dev);
 735
 736         return !!br->vlan_enabled;
 737 }
 738 EXPORT_SYMBOL_GPL(br_vlan_enabled);
 739
 740 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto)
 741 {
 742         int err = 0;
 743         struct net_bridge_port *p;
 744         struct net_bridge_vlan *vlan;
 745         struct net_bridge_vlan_group *vg;
 746         __be16 oldproto;
 747
 748         if (br->vlan_proto == proto)
 749                 return 0;
 750
 751         /* Add VLANs for the new proto to the device filter. */
 752         list_for_each_entry(p, &br->port_list, list) {
 753                 vg = nbp_vlan_group(p);
 754                 list_for_each_entry(vlan, &vg->vlan_list, vlist) {
 755                         err = vlan_vid_add(p->dev, proto, vlan->vid);
 756                         if (err)
 757                                 goto err_filt;
 758                 }
 759         }
 760
 761         oldproto = br->vlan_proto;
 762         br->vlan_proto = proto;
 763
 764         recalculate_group_addr(br);
 765         br_recalculate_fwd_mask(br);
 766
 767         /* Delete VLANs for the old proto from the device filter. */
 768         list_for_each_entry(p, &br->port_list, list) {
 769                 vg = nbp_vlan_group(p);
 770                 list_for_each_entry(vlan, &vg->vlan_list, vlist)
 771                         vlan_vid_del(p->dev, oldproto, vlan->vid);
 772         }
 773
 774         return 0;
 775
 776 err_filt:
 777         list_for_each_entry_continue_reverse(vlan, &vg->vlan_list, vlist)
 778                 vlan_vid_del(p->dev, proto, vlan->vid);
 779
 780         list_for_each_entry_continue_reverse(p, &br->port_list, list) {
 781                 vg = nbp_vlan_group(p);
 782                 list_for_each_entry(vlan, &vg->vlan_list, vlist)
 783                         vlan_vid_del(p->dev, proto, vlan->vid);
 784         }
 785
 786         return err;
 787 }
 788
 789 int br_vlan_set_proto(struct net_bridge *br, unsigned long val)
 790 {
 791         if (val != ETH_P_8021Q && val != ETH_P_8021AD)
 792                 return -EPROTONOSUPPORT;
 793
 794         return __br_vlan_set_proto(br, htons(val));
 795 }
 796
 797 int br_vlan_set_stats(struct net_bridge *br, unsigned long val)
 798 {
 799         switch (val) {
 800         case 0:
 801         case 1:
 802                 br->vlan_stats_enabled = val;
 803                 break;
 804         default:
 805                 return -EINVAL;
 806         }
 807
 808         return 0;
 809 }
 810
 811 static bool vlan_default_pvid(struct net_bridge_vlan_group *vg, u16 vid)
 812 {
 813         struct net_bridge_vlan *v;
 814
 815         if (vid != vg->pvid)
 816                 return false;
 817
 818         v = br_vlan_lookup(&vg->vlan_hash, vid);
 819         if (v && br_vlan_should_use(v) &&
 820             (v->flags & BRIDGE_VLAN_INFO_UNTAGGED))
 821                 return true;
 822
 823         return false;
 824 }
 825
 826 static void br_vlan_disable_default_pvid(struct net_bridge *br)
 827 {
 828         struct net_bridge_port *p;
 829         u16 pvid = br->default_pvid;
 830
 831         /* Disable default_pvid on all ports where it is still
 832          * configured.
 833          */
 834         if (vlan_default_pvid(br_vlan_group(br), pvid))
 835                 br_vlan_delete(br, pvid);
 836
 837         list_for_each_entry(p, &br->port_list, list) {
 838                 if (vlan_default_pvid(nbp_vlan_group(p), pvid))
 839                         nbp_vlan_delete(p, pvid);
 840         }
 841
 842         br->default_pvid = 0;
 843 }
 844
 845 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid)
 846 {
 847         const struct net_bridge_vlan *pvent;
 848         struct net_bridge_vlan_group *vg;
 849         struct net_bridge_port *p;
 850         unsigned long *changed;
 851         bool vlchange;
 852         u16 old_pvid;
 853         int err = 0;
 854
 855         if (!pvid) {
 856                 br_vlan_disable_default_pvid(br);
 857                 return 0;
 858         }
 859
 860         changed = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
 861                           GFP_KERNEL);
 862         if (!changed)
 863                 return -ENOMEM;
 864
 865         old_pvid = br->default_pvid;
 866
 867         /* Update default_pvid config only if we do not conflict with
 868          * user configuration.
 869          */
 870         vg = br_vlan_group(br);
 871         pvent = br_vlan_find(vg, pvid);
 872         if ((!old_pvid || vlan_default_pvid(vg, old_pvid)) &&
 873             (!pvent || !br_vlan_should_use(pvent))) {
 874                 err = br_vlan_add(br, pvid,
 875                                   BRIDGE_VLAN_INFO_PVID |
 876                                   BRIDGE_VLAN_INFO_UNTAGGED |
 877                                   BRIDGE_VLAN_INFO_BRENTRY,
 878                                   &vlchange);
 879                 if (err)
 880                         goto out;
 881                 br_vlan_delete(br, old_pvid);
 882                 set_bit(0, changed);
 883         }
 884
 885         list_for_each_entry(p, &br->port_list, list) {
 886                 /* Update default_pvid config only if we do not conflict with
 887                  * user configuration.
 888                  */
 889                 vg = nbp_vlan_group(p);
 890                 if ((old_pvid &&
 891                      !vlan_default_pvid(vg, old_pvid)) ||
 892                     br_vlan_find(vg, pvid))
 893                         continue;
 894
 895                 err = nbp_vlan_add(p, pvid,
 896                                    BRIDGE_VLAN_INFO_PVID |
 897                                    BRIDGE_VLAN_INFO_UNTAGGED,
 898                                    &vlchange);
 899                 if (err)
 900                         goto err_port;
 901                 nbp_vlan_delete(p, old_pvid);
 902                 set_bit(p->port_no, changed);
 903         }
 904
 905         br->default_pvid = pvid;
 906
 907 out:
 908         kfree(changed);
 909         return err;
 910
 911 err_port:
 912         list_for_each_entry_continue_reverse(p, &br->port_list, list) {
 913                 if (!test_bit(p->port_no, changed))
 914                         continue;
 915
 916                 if (old_pvid)
 917                         nbp_vlan_add(p, old_pvid,
 918                                      BRIDGE_VLAN_INFO_PVID |
 919                                      BRIDGE_VLAN_INFO_UNTAGGED,
 920                                      &vlchange);
 921                 nbp_vlan_delete(p, pvid);
 922         }
 923
 924         if (test_bit(0, changed)) {
 925                 if (old_pvid)
 926                         br_vlan_add(br, old_pvid,
 927                                     BRIDGE_VLAN_INFO_PVID |
 928                                     BRIDGE_VLAN_INFO_UNTAGGED |
 929                                     BRIDGE_VLAN_INFO_BRENTRY,
 930                                     &vlchange);
 931                 br_vlan_delete(br, pvid);
 932         }
 933         goto out;
 934 }
 935
 936 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val)
 937 {
 938         u16 pvid = val;
 939         int err = 0;
 940
 941         if (val >= VLAN_VID_MASK)
 942                 return -EINVAL;
 943
 944         if (pvid == br->default_pvid)
 945                 goto out;
 946
 947         /* Only allow default pvid change when filtering is disabled */
 948         if (br->vlan_enabled) {
 949                 pr_info_once("Please disable vlan filtering to change default_pvid\n");
 950                 err = -EPERM;
 951                 goto out;
 952         }
 953         err = __br_vlan_set_default_pvid(br, pvid);
 954 out:
 955         return err;
 956 }
 957
 958 int br_vlan_init(struct net_bridge *br)
 959 {
 960         struct net_bridge_vlan_group *vg;
 961         int ret = -ENOMEM;
 962         bool changed;
 963
 964         vg = kzalloc(sizeof(*vg), GFP_KERNEL);
 965         if (!vg)
 966                 goto out;
 967         ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params);
 968         if (ret)
 969                 goto err_rhtbl;
 970         ret = vlan_tunnel_init(vg);
 971         if (ret)
 972                 goto err_tunnel_init;
 973         INIT_LIST_HEAD(&vg->vlan_list);
 974         br->vlan_proto = htons(ETH_P_8021Q);
 975         br->default_pvid = 1;
 976         rcu_assign_pointer(br->vlgrp, vg);
 977         ret = br_vlan_add(br, 1,
 978                           BRIDGE_VLAN_INFO_PVID | BRIDGE_VLAN_INFO_UNTAGGED |
 979                           BRIDGE_VLAN_INFO_BRENTRY, &changed);
 980         if (ret)
 981                 goto err_vlan_add;
 982
 983 out:
 984         return ret;
 985
 986 err_vlan_add:
 987         vlan_tunnel_deinit(vg);
 988 err_tunnel_init:
 989         rhashtable_destroy(&vg->vlan_hash);
 990 err_rhtbl:
 991         kfree(vg);
 992
 993         goto out;
 994 }
 995
 996 int nbp_vlan_init(struct net_bridge_port *p)
 997 {
 998         struct switchdev_attr attr = {
 999                 .orig_dev = p->br->dev,
1000                 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
1001                 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
1002                 .u.vlan_filtering = p->br->vlan_enabled,
1003         };
1004         struct net_bridge_vlan_group *vg;
1005         int ret = -ENOMEM;
1006
1007         vg = kzalloc(sizeof(struct net_bridge_vlan_group), GFP_KERNEL);
1008         if (!vg)
1009                 goto out;
1010
1011         ret = switchdev_port_attr_set(p->dev, &attr);
1012         if (ret && ret != -EOPNOTSUPP)
1013                 goto err_vlan_enabled;
1014
1015         ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params);
1016         if (ret)
1017                 goto err_rhtbl;
1018         ret = vlan_tunnel_init(vg);
1019         if (ret)
1020                 goto err_tunnel_init;
1021         INIT_LIST_HEAD(&vg->vlan_list);
1022         rcu_assign_pointer(p->vlgrp, vg);
1023         if (p->br->default_pvid) {
1024                 bool changed;
1025
1026                 ret = nbp_vlan_add(p, p->br->default_pvid,
1027                                    BRIDGE_VLAN_INFO_PVID |
1028                                    BRIDGE_VLAN_INFO_UNTAGGED,
1029                                    &changed);
1030                 if (ret)
1031                         goto err_vlan_add;
1032         }
1033 out:
1034         return ret;
1035
1036 err_vlan_add:
1037         RCU_INIT_POINTER(p->vlgrp, NULL);
1038         synchronize_rcu();
1039         vlan_tunnel_deinit(vg);
1040 err_tunnel_init:
1041         rhashtable_destroy(&vg->vlan_hash);
1042 err_rhtbl:
1043 err_vlan_enabled:
1044         kfree(vg);
1045
1046         goto out;
1047 }
1048
1049 /* Must be protected by RTNL.
1050  * Must be called with vid in range from 1 to 4094 inclusive.
1051  * changed must be true only if the vlan was created or updated
1052  */
1053 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
1054                  bool *changed)
1055 {
1056         struct switchdev_obj_port_vlan v = {
1057                 .obj.orig_dev = port->dev,
1058                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
1059                 .flags = flags,
1060                 .vid_begin = vid,
1061                 .vid_end = vid,
1062         };
1063         struct net_bridge_vlan *vlan;
1064         int ret;
1065
1066         ASSERT_RTNL();
1067
1068         *changed = false;
1069         vlan = br_vlan_find(nbp_vlan_group(port), vid);
1070         if (vlan) {
1071                 /* Pass the flags to the hardware bridge */
1072                 ret = switchdev_port_obj_add(port->dev, &v.obj);
1073                 if (ret && ret != -EOPNOTSUPP)
1074                         return ret;
1075                 *changed = __vlan_add_flags(vlan, flags);
1076
1077                 return 0;
1078         }
1079
1080         vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
1081         if (!vlan)
1082                 return -ENOMEM;
1083
1084         vlan->vid = vid;
1085         vlan->port = port;
1086         ret = __vlan_add(vlan, flags);
1087         if (ret)
1088                 kfree(vlan);
1089         else
1090                 *changed = true;
1091
1092         return ret;
1093 }
1094
1095 /* Must be protected by RTNL.
1096  * Must be called with vid in range from 1 to 4094 inclusive.
1097  */
1098 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
1099 {
1100         struct net_bridge_vlan *v;
1101
1102         ASSERT_RTNL();
1103
1104         v = br_vlan_find(nbp_vlan_group(port), vid);
1105         if (!v)
1106                 return -ENOENT;
1107         br_fdb_find_delete_local(port->br, port, port->dev->dev_addr, vid);
1108         br_fdb_delete_by_port(port->br, port, vid, 0);
1109
1110         return __vlan_del(v);
1111 }
1112
1113 void nbp_vlan_flush(struct net_bridge_port *port)
1114 {
1115         struct net_bridge_vlan_group *vg;
1116
1117         ASSERT_RTNL();
1118
1119         vg = nbp_vlan_group(port);
1120         __vlan_flush(vg);
1121         RCU_INIT_POINTER(port->vlgrp, NULL);
1122         synchronize_rcu();
1123         __vlan_group_free(vg);
1124 }
1125
1126 void br_vlan_get_stats(const struct net_bridge_vlan *v,
1127                        struct br_vlan_stats *stats)
1128 {
1129         int i;
1130
1131         memset(stats, 0, sizeof(*stats));
1132         for_each_possible_cpu(i) {
1133                 u64 rxpackets, rxbytes, txpackets, txbytes;
1134                 struct br_vlan_stats *cpu_stats;
1135                 unsigned int start;
1136
1137                 cpu_stats = per_cpu_ptr(v->stats, i);
1138                 do {
1139                         start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1140                         rxpackets = cpu_stats->rx_packets;
1141                         rxbytes = cpu_stats->rx_bytes;
1142                         txbytes = cpu_stats->tx_bytes;
1143                         txpackets = cpu_stats->tx_packets;
1144                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
1145
1146                 stats->rx_packets += rxpackets;
1147                 stats->rx_bytes += rxbytes;
1148                 stats->tx_bytes += txbytes;
1149                 stats->tx_packets += txpackets;
1150         }
1151 }