git.rot13.org Git - linux/blob - 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         int err;
  86
  87         /* Try switchdev op first. In case it is not supported, fallback to
  88          * 8021q add.
  89          */
  90         err = br_switchdev_port_vlan_add(dev, vid, flags);
  91         if (err == -EOPNOTSUPP)
  92                 return vlan_vid_add(dev, br->vlan_proto, vid);
  93         return err;
  94 }
  95
  96 static void __vlan_add_list(struct net_bridge_vlan *v)
  97 {
  98         struct net_bridge_vlan_group *vg;
  99         struct list_head *headp, *hpos;
 100         struct net_bridge_vlan *vent;
 101
 102         if (br_vlan_is_master(v))
 103                 vg = br_vlan_group(v->br);
 104         else
 105                 vg = nbp_vlan_group(v->port);
 106
 107         headp = &vg->vlan_list;
 108         list_for_each_prev(hpos, headp) {
 109                 vent = list_entry(hpos, struct net_bridge_vlan, vlist);
 110                 if (v->vid < vent->vid)
 111                         continue;
 112                 else
 113                         break;
 114         }
 115         list_add_rcu(&v->vlist, hpos);
 116 }
 117
 118 static void __vlan_del_list(struct net_bridge_vlan *v)
 119 {
 120         list_del_rcu(&v->vlist);
 121 }
 122
 123 static int __vlan_vid_del(struct net_device *dev, struct net_bridge *br,
 124                           u16 vid)
 125 {
 126         int err;
 127
 128         /* Try switchdev op first. In case it is not supported, fallback to
 129          * 8021q del.
 130          */
 131         err = br_switchdev_port_vlan_del(dev, vid);
 132         if (err == -EOPNOTSUPP) {
 133                 vlan_vid_del(dev, br->vlan_proto, vid);
 134                 return 0;
 135         }
 136         return err;
 137 }
 138
 139 /* Returns a master vlan, if it didn't exist it gets created. In all cases a
 140  * a reference is taken to the master vlan before returning.
 141  */
 142 static struct net_bridge_vlan *br_vlan_get_master(struct net_bridge *br, u16 vid)
 143 {
 144         struct net_bridge_vlan_group *vg;
 145         struct net_bridge_vlan *masterv;
 146
 147         vg = br_vlan_group(br);
 148         masterv = br_vlan_find(vg, vid);
 149         if (!masterv) {
 150                 bool changed;
 151
 152                 /* missing global ctx, create it now */
 153                 if (br_vlan_add(br, vid, 0, &changed))
 154                         return NULL;
 155                 masterv = br_vlan_find(vg, vid);
 156                 if (WARN_ON(!masterv))
 157                         return NULL;
 158                 refcount_set(&masterv->refcnt, 1);
 159                 return masterv;
 160         }
 161         refcount_inc(&masterv->refcnt);
 162
 163         return masterv;
 164 }
 165
 166 static void br_master_vlan_rcu_free(struct rcu_head *rcu)
 167 {
 168         struct net_bridge_vlan *v;
 169
 170         v = container_of(rcu, struct net_bridge_vlan, rcu);
 171         WARN_ON(!br_vlan_is_master(v));
 172         free_percpu(v->stats);
 173         v->stats = NULL;
 174         kfree(v);
 175 }
 176
 177 static void br_vlan_put_master(struct net_bridge_vlan *masterv)
 178 {
 179         struct net_bridge_vlan_group *vg;
 180
 181         if (!br_vlan_is_master(masterv))
 182                 return;
 183
 184         vg = br_vlan_group(masterv->br);
 185         if (refcount_dec_and_test(&masterv->refcnt)) {
 186                 rhashtable_remove_fast(&vg->vlan_hash,
 187                                        &masterv->vnode, br_vlan_rht_params);
 188                 __vlan_del_list(masterv);
 189                 call_rcu(&masterv->rcu, br_master_vlan_rcu_free);
 190         }
 191 }
 192
 193 /* This is the shared VLAN add function which works for both ports and bridge
 194  * devices. There are four possible calls to this function in terms of the
 195  * vlan entry type:
 196  * 1. vlan is being added on a port (no master flags, global entry exists)
 197  * 2. vlan is being added on a bridge (both master and brentry flags)
 198  * 3. vlan is being added on a port, but a global entry didn't exist which
 199  *    is being created right now (master flag set, brentry flag unset), the
 200  *    global entry is used for global per-vlan features, but not for filtering
 201  * 4. same as 3 but with both master and brentry flags set so the entry
 202  *    will be used for filtering in both the port and the bridge
 203  */
 204 static int __vlan_add(struct net_bridge_vlan *v, u16 flags)
 205 {
 206         struct net_bridge_vlan *masterv = NULL;
 207         struct net_bridge_port *p = NULL;
 208         struct net_bridge_vlan_group *vg;
 209         struct net_device *dev;
 210         struct net_bridge *br;
 211         int err;
 212
 213         if (br_vlan_is_master(v)) {
 214                 br = v->br;
 215                 dev = br->dev;
 216                 vg = br_vlan_group(br);
 217         } else {
 218                 p = v->port;
 219                 br = p->br;
 220                 dev = p->dev;
 221                 vg = nbp_vlan_group(p);
 222         }
 223
 224         if (p) {
 225                 /* Add VLAN to the device filter if it is supported.
 226                  * This ensures tagged traffic enters the bridge when
 227                  * promiscuous mode is disabled by br_manage_promisc().
 228                  */
 229                 err = __vlan_vid_add(dev, br, v->vid, flags);
 230                 if (err)
 231                         goto out;
 232
 233                 /* need to work on the master vlan too */
 234                 if (flags & BRIDGE_VLAN_INFO_MASTER) {
 235                         bool changed;
 236
 237                         err = br_vlan_add(br, v->vid,
 238                                           flags | BRIDGE_VLAN_INFO_BRENTRY,
 239                                           &changed);
 240                         if (err)
 241                                 goto out_filt;
 242                 }
 243
 244                 masterv = br_vlan_get_master(br, v->vid);
 245                 if (!masterv)
 246                         goto out_filt;
 247                 v->brvlan = masterv;
 248                 v->stats = masterv->stats;
 249         } else {
 250                 err = br_switchdev_port_vlan_add(dev, v->vid, flags);
 251                 if (err && err != -EOPNOTSUPP)
 252                         goto out;
 253         }
 254
 255         /* Add the dev mac and count the vlan only if it's usable */
 256         if (br_vlan_should_use(v)) {
 257                 err = br_fdb_insert(br, p, dev->dev_addr, v->vid);
 258                 if (err) {
 259                         br_err(br, "failed insert local address into bridge forwarding table\n");
 260                         goto out_filt;
 261                 }
 262                 vg->num_vlans++;
 263         }
 264
 265         err = rhashtable_lookup_insert_fast(&vg->vlan_hash, &v->vnode,
 266                                             br_vlan_rht_params);
 267         if (err)
 268                 goto out_fdb_insert;
 269
 270         __vlan_add_list(v);
 271         __vlan_add_flags(v, flags);
 272 out:
 273         return err;
 274
 275 out_fdb_insert:
 276         if (br_vlan_should_use(v)) {
 277                 br_fdb_find_delete_local(br, p, dev->dev_addr, v->vid);
 278                 vg->num_vlans--;
 279         }
 280
 281 out_filt:
 282         if (p) {
 283                 __vlan_vid_del(dev, br, v->vid);
 284                 if (masterv) {
 285                         br_vlan_put_master(masterv);
 286                         v->brvlan = NULL;
 287                 }
 288         } else {
 289                 br_switchdev_port_vlan_del(dev, v->vid);
 290         }
 291
 292         goto out;
 293 }
 294
 295 static int __vlan_del(struct net_bridge_vlan *v)
 296 {
 297         struct net_bridge_vlan *masterv = v;
 298         struct net_bridge_vlan_group *vg;
 299         struct net_bridge_port *p = NULL;
 300         int err = 0;
 301
 302         if (br_vlan_is_master(v)) {
 303                 vg = br_vlan_group(v->br);
 304         } else {
 305                 p = v->port;
 306                 vg = nbp_vlan_group(v->port);
 307                 masterv = v->brvlan;
 308         }
 309
 310         __vlan_delete_pvid(vg, v->vid);
 311         if (p) {
 312                 err = __vlan_vid_del(p->dev, p->br, v->vid);
 313                 if (err)
 314                         goto out;
 315         } else {
 316                 err = br_switchdev_port_vlan_del(v->br->dev, v->vid);
 317                 if (err && err != -EOPNOTSUPP)
 318                         goto out;
 319                 err = 0;
 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 static int br_vlan_add_existing(struct net_bridge *br,
 566                                 struct net_bridge_vlan_group *vg,
 567                                 struct net_bridge_vlan *vlan,
 568                                 u16 flags, bool *changed)
 569 {
 570         int err;
 571
 572         err = br_switchdev_port_vlan_add(br->dev, vlan->vid, flags);
 573         if (err && err != -EOPNOTSUPP)
 574                 return err;
 575
 576         if (!br_vlan_is_brentry(vlan)) {
 577                 /* Trying to change flags of non-existent bridge vlan */
 578                 if (!(flags & BRIDGE_VLAN_INFO_BRENTRY)) {
 579                         err = -EINVAL;
 580                         goto err_flags;
 581                 }
 582                 /* It was only kept for port vlans, now make it real */
 583                 err = br_fdb_insert(br, NULL, br->dev->dev_addr,
 584                                     vlan->vid);
 585                 if (err) {
 586                         br_err(br, "failed to insert local address into bridge forwarding table\n");
 587                         goto err_fdb_insert;
 588                 }
 589
 590                 refcount_inc(&vlan->refcnt);
 591                 vlan->flags |= BRIDGE_VLAN_INFO_BRENTRY;
 592                 vg->num_vlans++;
 593                 *changed = true;
 594         }
 595
 596         if (__vlan_add_flags(vlan, flags))
 597                 *changed = true;
 598
 599         return 0;
 600
 601 err_fdb_insert:
 602 err_flags:
 603         br_switchdev_port_vlan_del(br->dev, vlan->vid);
 604         return err;
 605 }
 606
 607 /* Must be protected by RTNL.
 608  * Must be called with vid in range from 1 to 4094 inclusive.
 609  * changed must be true only if the vlan was created or updated
 610  */
 611 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, bool *changed)
 612 {
 613         struct net_bridge_vlan_group *vg;
 614         struct net_bridge_vlan *vlan;
 615         int ret;
 616
 617         ASSERT_RTNL();
 618
 619         *changed = false;
 620         vg = br_vlan_group(br);
 621         vlan = br_vlan_find(vg, vid);
 622         if (vlan)
 623                 return br_vlan_add_existing(br, vg, vlan, flags, changed);
 624
 625         vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
 626         if (!vlan)
 627                 return -ENOMEM;
 628
 629         vlan->stats = netdev_alloc_pcpu_stats(struct br_vlan_stats);
 630         if (!vlan->stats) {
 631                 kfree(vlan);
 632                 return -ENOMEM;
 633         }
 634         vlan->vid = vid;
 635         vlan->flags = flags | BRIDGE_VLAN_INFO_MASTER;
 636         vlan->flags &= ~BRIDGE_VLAN_INFO_PVID;
 637         vlan->br = br;
 638         if (flags & BRIDGE_VLAN_INFO_BRENTRY)
 639                 refcount_set(&vlan->refcnt, 1);
 640         ret = __vlan_add(vlan, flags);
 641         if (ret) {
 642                 free_percpu(vlan->stats);
 643                 kfree(vlan);
 644         } else {
 645                 *changed = true;
 646         }
 647
 648         return ret;
 649 }
 650
 651 /* Must be protected by RTNL.
 652  * Must be called with vid in range from 1 to 4094 inclusive.
 653  */
 654 int br_vlan_delete(struct net_bridge *br, u16 vid)
 655 {
 656         struct net_bridge_vlan_group *vg;
 657         struct net_bridge_vlan *v;
 658
 659         ASSERT_RTNL();
 660
 661         vg = br_vlan_group(br);
 662         v = br_vlan_find(vg, vid);
 663         if (!v || !br_vlan_is_brentry(v))
 664                 return -ENOENT;
 665
 666         br_fdb_find_delete_local(br, NULL, br->dev->dev_addr, vid);
 667         br_fdb_delete_by_port(br, NULL, vid, 0);
 668
 669         vlan_tunnel_info_del(vg, v);
 670
 671         return __vlan_del(v);
 672 }
 673
 674 void br_vlan_flush(struct net_bridge *br)
 675 {
 676         struct net_bridge_vlan_group *vg;
 677
 678         ASSERT_RTNL();
 679
 680         vg = br_vlan_group(br);
 681         __vlan_flush(vg);
 682         RCU_INIT_POINTER(br->vlgrp, NULL);
 683         synchronize_rcu();
 684         __vlan_group_free(vg);
 685 }
 686
 687 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid)
 688 {
 689         if (!vg)
 690                 return NULL;
 691
 692         return br_vlan_lookup(&vg->vlan_hash, vid);
 693 }
 694
 695 /* Must be protected by RTNL. */
 696 static void recalculate_group_addr(struct net_bridge *br)
 697 {
 698         if (br->group_addr_set)
 699                 return;
 700
 701         spin_lock_bh(&br->lock);
 702         if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q)) {
 703                 /* Bridge Group Address */
 704                 br->group_addr[5] = 0x00;
 705         } else { /* vlan_enabled && ETH_P_8021AD */
 706                 /* Provider Bridge Group Address */
 707                 br->group_addr[5] = 0x08;
 708         }
 709         spin_unlock_bh(&br->lock);
 710 }
 711
 712 /* Must be protected by RTNL. */
 713 void br_recalculate_fwd_mask(struct net_bridge *br)
 714 {
 715         if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q))
 716                 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
 717         else /* vlan_enabled && ETH_P_8021AD */
 718                 br->group_fwd_mask_required = BR_GROUPFWD_8021AD &
 719                                               ~(1u << br->group_addr[5]);
 720 }
 721
 722 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
 723 {
 724         struct switchdev_attr attr = {
 725                 .orig_dev = br->dev,
 726                 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
 727                 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
 728                 .u.vlan_filtering = val,
 729         };
 730         int err;
 731
 732         if (br->vlan_enabled == val)
 733                 return 0;
 734
 735         err = switchdev_port_attr_set(br->dev, &attr);
 736         if (err && err != -EOPNOTSUPP)
 737                 return err;
 738
 739         br->vlan_enabled = val;
 740         br_manage_promisc(br);
 741         recalculate_group_addr(br);
 742         br_recalculate_fwd_mask(br);
 743
 744         return 0;
 745 }
 746
 747 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
 748 {
 749         return __br_vlan_filter_toggle(br, val);
 750 }
 751
 752 bool br_vlan_enabled(const struct net_device *dev)
 753 {
 754         struct net_bridge *br = netdev_priv(dev);
 755
 756         return !!br->vlan_enabled;
 757 }
 758 EXPORT_SYMBOL_GPL(br_vlan_enabled);
 759
 760 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto)
 761 {
 762         int err = 0;
 763         struct net_bridge_port *p;
 764         struct net_bridge_vlan *vlan;
 765         struct net_bridge_vlan_group *vg;
 766         __be16 oldproto;
 767
 768         if (br->vlan_proto == proto)
 769                 return 0;
 770
 771         /* Add VLANs for the new proto to the device filter. */
 772         list_for_each_entry(p, &br->port_list, list) {
 773                 vg = nbp_vlan_group(p);
 774                 list_for_each_entry(vlan, &vg->vlan_list, vlist) {
 775                         err = vlan_vid_add(p->dev, proto, vlan->vid);
 776                         if (err)
 777                                 goto err_filt;
 778                 }
 779         }
 780
 781         oldproto = br->vlan_proto;
 782         br->vlan_proto = proto;
 783
 784         recalculate_group_addr(br);
 785         br_recalculate_fwd_mask(br);
 786
 787         /* Delete VLANs for the old proto from the device filter. */
 788         list_for_each_entry(p, &br->port_list, list) {
 789                 vg = nbp_vlan_group(p);
 790                 list_for_each_entry(vlan, &vg->vlan_list, vlist)
 791                         vlan_vid_del(p->dev, oldproto, vlan->vid);
 792         }
 793
 794         return 0;
 795
 796 err_filt:
 797         list_for_each_entry_continue_reverse(vlan, &vg->vlan_list, vlist)
 798                 vlan_vid_del(p->dev, proto, vlan->vid);
 799
 800         list_for_each_entry_continue_reverse(p, &br->port_list, list) {
 801                 vg = nbp_vlan_group(p);
 802                 list_for_each_entry(vlan, &vg->vlan_list, vlist)
 803                         vlan_vid_del(p->dev, proto, vlan->vid);
 804         }
 805
 806         return err;
 807 }
 808
 809 int br_vlan_set_proto(struct net_bridge *br, unsigned long val)
 810 {
 811         if (val != ETH_P_8021Q && val != ETH_P_8021AD)
 812                 return -EPROTONOSUPPORT;
 813
 814         return __br_vlan_set_proto(br, htons(val));
 815 }
 816
 817 int br_vlan_set_stats(struct net_bridge *br, unsigned long val)
 818 {
 819         switch (val) {
 820         case 0:
 821         case 1:
 822                 br->vlan_stats_enabled = val;
 823                 break;
 824         default:
 825                 return -EINVAL;
 826         }
 827
 828         return 0;
 829 }
 830
 831 static bool vlan_default_pvid(struct net_bridge_vlan_group *vg, u16 vid)
 832 {
 833         struct net_bridge_vlan *v;
 834
 835         if (vid != vg->pvid)
 836                 return false;
 837
 838         v = br_vlan_lookup(&vg->vlan_hash, vid);
 839         if (v && br_vlan_should_use(v) &&
 840             (v->flags & BRIDGE_VLAN_INFO_UNTAGGED))
 841                 return true;
 842
 843         return false;
 844 }
 845
 846 static void br_vlan_disable_default_pvid(struct net_bridge *br)
 847 {
 848         struct net_bridge_port *p;
 849         u16 pvid = br->default_pvid;
 850
 851         /* Disable default_pvid on all ports where it is still
 852          * configured.
 853          */
 854         if (vlan_default_pvid(br_vlan_group(br), pvid))
 855                 br_vlan_delete(br, pvid);
 856
 857         list_for_each_entry(p, &br->port_list, list) {
 858                 if (vlan_default_pvid(nbp_vlan_group(p), pvid))
 859                         nbp_vlan_delete(p, pvid);
 860         }
 861
 862         br->default_pvid = 0;
 863 }
 864
 865 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid)
 866 {
 867         const struct net_bridge_vlan *pvent;
 868         struct net_bridge_vlan_group *vg;
 869         struct net_bridge_port *p;
 870         unsigned long *changed;
 871         bool vlchange;
 872         u16 old_pvid;
 873         int err = 0;
 874
 875         if (!pvid) {
 876                 br_vlan_disable_default_pvid(br);
 877                 return 0;
 878         }
 879
 880         changed = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
 881                           GFP_KERNEL);
 882         if (!changed)
 883                 return -ENOMEM;
 884
 885         old_pvid = br->default_pvid;
 886
 887         /* Update default_pvid config only if we do not conflict with
 888          * user configuration.
 889          */
 890         vg = br_vlan_group(br);
 891         pvent = br_vlan_find(vg, pvid);
 892         if ((!old_pvid || vlan_default_pvid(vg, old_pvid)) &&
 893             (!pvent || !br_vlan_should_use(pvent))) {
 894                 err = br_vlan_add(br, pvid,
 895                                   BRIDGE_VLAN_INFO_PVID |
 896                                   BRIDGE_VLAN_INFO_UNTAGGED |
 897                                   BRIDGE_VLAN_INFO_BRENTRY,
 898                                   &vlchange);
 899                 if (err)
 900                         goto out;
 901                 br_vlan_delete(br, old_pvid);
 902                 set_bit(0, changed);
 903         }
 904
 905         list_for_each_entry(p, &br->port_list, list) {
 906                 /* Update default_pvid config only if we do not conflict with
 907                  * user configuration.
 908                  */
 909                 vg = nbp_vlan_group(p);
 910                 if ((old_pvid &&
 911                      !vlan_default_pvid(vg, old_pvid)) ||
 912                     br_vlan_find(vg, pvid))
 913                         continue;
 914
 915                 err = nbp_vlan_add(p, pvid,
 916                                    BRIDGE_VLAN_INFO_PVID |
 917                                    BRIDGE_VLAN_INFO_UNTAGGED,
 918                                    &vlchange);
 919                 if (err)
 920                         goto err_port;
 921                 nbp_vlan_delete(p, old_pvid);
 922                 set_bit(p->port_no, changed);
 923         }
 924
 925         br->default_pvid = pvid;
 926
 927 out:
 928         kfree(changed);
 929         return err;
 930
 931 err_port:
 932         list_for_each_entry_continue_reverse(p, &br->port_list, list) {
 933                 if (!test_bit(p->port_no, changed))
 934                         continue;
 935
 936                 if (old_pvid)
 937                         nbp_vlan_add(p, old_pvid,
 938                                      BRIDGE_VLAN_INFO_PVID |
 939                                      BRIDGE_VLAN_INFO_UNTAGGED,
 940                                      &vlchange);
 941                 nbp_vlan_delete(p, pvid);
 942         }
 943
 944         if (test_bit(0, changed)) {
 945                 if (old_pvid)
 946                         br_vlan_add(br, old_pvid,
 947                                     BRIDGE_VLAN_INFO_PVID |
 948                                     BRIDGE_VLAN_INFO_UNTAGGED |
 949                                     BRIDGE_VLAN_INFO_BRENTRY,
 950                                     &vlchange);
 951                 br_vlan_delete(br, pvid);
 952         }
 953         goto out;
 954 }
 955
 956 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val)
 957 {
 958         u16 pvid = val;
 959         int err = 0;
 960
 961         if (val >= VLAN_VID_MASK)
 962                 return -EINVAL;
 963
 964         if (pvid == br->default_pvid)
 965                 goto out;
 966
 967         /* Only allow default pvid change when filtering is disabled */
 968         if (br->vlan_enabled) {
 969                 pr_info_once("Please disable vlan filtering to change default_pvid\n");
 970                 err = -EPERM;
 971                 goto out;
 972         }
 973         err = __br_vlan_set_default_pvid(br, pvid);
 974 out:
 975         return err;
 976 }
 977
 978 int br_vlan_init(struct net_bridge *br)
 979 {
 980         struct net_bridge_vlan_group *vg;
 981         int ret = -ENOMEM;
 982         bool changed;
 983
 984         vg = kzalloc(sizeof(*vg), GFP_KERNEL);
 985         if (!vg)
 986                 goto out;
 987         ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params);
 988         if (ret)
 989                 goto err_rhtbl;
 990         ret = vlan_tunnel_init(vg);
 991         if (ret)
 992                 goto err_tunnel_init;
 993         INIT_LIST_HEAD(&vg->vlan_list);
 994         br->vlan_proto = htons(ETH_P_8021Q);
 995         br->default_pvid = 1;
 996         rcu_assign_pointer(br->vlgrp, vg);
 997         ret = br_vlan_add(br, 1,
 998                           BRIDGE_VLAN_INFO_PVID | BRIDGE_VLAN_INFO_UNTAGGED |
 999                           BRIDGE_VLAN_INFO_BRENTRY, &changed);
1000         if (ret)
1001                 goto err_vlan_add;
1002
1003 out:
1004         return ret;
1005
1006 err_vlan_add:
1007         vlan_tunnel_deinit(vg);
1008 err_tunnel_init:
1009         rhashtable_destroy(&vg->vlan_hash);
1010 err_rhtbl:
1011         kfree(vg);
1012
1013         goto out;
1014 }
1015
1016 int nbp_vlan_init(struct net_bridge_port *p)
1017 {
1018         struct switchdev_attr attr = {
1019                 .orig_dev = p->br->dev,
1020                 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
1021                 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
1022                 .u.vlan_filtering = p->br->vlan_enabled,
1023         };
1024         struct net_bridge_vlan_group *vg;
1025         int ret = -ENOMEM;
1026
1027         vg = kzalloc(sizeof(struct net_bridge_vlan_group), GFP_KERNEL);
1028         if (!vg)
1029                 goto out;
1030
1031         ret = switchdev_port_attr_set(p->dev, &attr);
1032         if (ret && ret != -EOPNOTSUPP)
1033                 goto err_vlan_enabled;
1034
1035         ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params);
1036         if (ret)
1037                 goto err_rhtbl;
1038         ret = vlan_tunnel_init(vg);
1039         if (ret)
1040                 goto err_tunnel_init;
1041         INIT_LIST_HEAD(&vg->vlan_list);
1042         rcu_assign_pointer(p->vlgrp, vg);
1043         if (p->br->default_pvid) {
1044                 bool changed;
1045
1046                 ret = nbp_vlan_add(p, p->br->default_pvid,
1047                                    BRIDGE_VLAN_INFO_PVID |
1048                                    BRIDGE_VLAN_INFO_UNTAGGED,
1049                                    &changed);
1050                 if (ret)
1051                         goto err_vlan_add;
1052         }
1053 out:
1054         return ret;
1055
1056 err_vlan_add:
1057         RCU_INIT_POINTER(p->vlgrp, NULL);
1058         synchronize_rcu();
1059         vlan_tunnel_deinit(vg);
1060 err_tunnel_init:
1061         rhashtable_destroy(&vg->vlan_hash);
1062 err_rhtbl:
1063 err_vlan_enabled:
1064         kfree(vg);
1065
1066         goto out;
1067 }
1068
1069 /* Must be protected by RTNL.
1070  * Must be called with vid in range from 1 to 4094 inclusive.
1071  * changed must be true only if the vlan was created or updated
1072  */
1073 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
1074                  bool *changed)
1075 {
1076         struct net_bridge_vlan *vlan;
1077         int ret;
1078
1079         ASSERT_RTNL();
1080
1081         *changed = false;
1082         vlan = br_vlan_find(nbp_vlan_group(port), vid);
1083         if (vlan) {
1084                 /* Pass the flags to the hardware bridge */
1085                 ret = br_switchdev_port_vlan_add(port->dev, vid, flags);
1086                 if (ret && ret != -EOPNOTSUPP)
1087                         return ret;
1088                 *changed = __vlan_add_flags(vlan, flags);
1089
1090                 return 0;
1091         }
1092
1093         vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
1094         if (!vlan)
1095                 return -ENOMEM;
1096
1097         vlan->vid = vid;
1098         vlan->port = port;
1099         ret = __vlan_add(vlan, flags);
1100         if (ret)
1101                 kfree(vlan);
1102         else
1103                 *changed = true;
1104
1105         return ret;
1106 }
1107
1108 /* Must be protected by RTNL.
1109  * Must be called with vid in range from 1 to 4094 inclusive.
1110  */
1111 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
1112 {
1113         struct net_bridge_vlan *v;
1114
1115         ASSERT_RTNL();
1116
1117         v = br_vlan_find(nbp_vlan_group(port), vid);
1118         if (!v)
1119                 return -ENOENT;
1120         br_fdb_find_delete_local(port->br, port, port->dev->dev_addr, vid);
1121         br_fdb_delete_by_port(port->br, port, vid, 0);
1122
1123         return __vlan_del(v);
1124 }
1125
1126 void nbp_vlan_flush(struct net_bridge_port *port)
1127 {
1128         struct net_bridge_vlan_group *vg;
1129
1130         ASSERT_RTNL();
1131
1132         vg = nbp_vlan_group(port);
1133         __vlan_flush(vg);
1134         RCU_INIT_POINTER(port->vlgrp, NULL);
1135         synchronize_rcu();
1136         __vlan_group_free(vg);
1137 }
1138
1139 void br_vlan_get_stats(const struct net_bridge_vlan *v,
1140                        struct br_vlan_stats *stats)
1141 {
1142         int i;
1143
1144         memset(stats, 0, sizeof(*stats));
1145         for_each_possible_cpu(i) {
1146                 u64 rxpackets, rxbytes, txpackets, txbytes;
1147                 struct br_vlan_stats *cpu_stats;
1148                 unsigned int start;
1149
1150                 cpu_stats = per_cpu_ptr(v->stats, i);
1151                 do {
1152                         start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1153                         rxpackets = cpu_stats->rx_packets;
1154                         rxbytes = cpu_stats->rx_bytes;
1155                         txbytes = cpu_stats->tx_bytes;
1156                         txpackets = cpu_stats->tx_packets;
1157                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
1158
1159                 stats->rx_packets += rxpackets;
1160                 stats->rx_bytes += rxbytes;
1161                 stats->tx_bytes += txbytes;
1162                 stats->tx_packets += txpackets;
1163         }
1164 }
1165
1166 int br_vlan_get_pvid(const struct net_device *dev, u16 *p_pvid)
1167 {
1168         struct net_bridge_vlan_group *vg;
1169
1170         ASSERT_RTNL();
1171         if (netif_is_bridge_master(dev))
1172                 vg = br_vlan_group(netdev_priv(dev));
1173         else
1174                 return -EINVAL;
1175
1176         *p_pvid = br_get_pvid(vg);
1177         return 0;
1178 }
1179 EXPORT_SYMBOL_GPL(br_vlan_get_pvid);
1180
1181 int br_vlan_get_info(const struct net_device *dev, u16 vid,
1182                      struct bridge_vlan_info *p_vinfo)
1183 {
1184         struct net_bridge_vlan_group *vg;
1185         struct net_bridge_vlan *v;
1186         struct net_bridge_port *p;
1187
1188         ASSERT_RTNL();
1189         p = br_port_get_check_rtnl(dev);
1190         if (p)
1191                 vg = nbp_vlan_group(p);
1192         else if (netif_is_bridge_master(dev))
1193                 vg = br_vlan_group(netdev_priv(dev));
1194         else
1195                 return -EINVAL;
1196
1197         v = br_vlan_find(vg, vid);
1198         if (!v)
1199                 return -ENOENT;
1200
1201         p_vinfo->vid = vid;
1202         p_vinfo->flags = v->flags;
1203         return 0;
1204 }
1205 EXPORT_SYMBOL_GPL(br_vlan_get_info);