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