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 static void nbp_vlan_rcu_free(struct rcu_head *rcu)
 194 {
 195         struct net_bridge_vlan *v;
 196
 197         v = container_of(rcu, struct net_bridge_vlan, rcu);
 198         WARN_ON(br_vlan_is_master(v));
 199         /* if we had per-port stats configured then free them here */
 200         if (v->brvlan->stats != v->stats)
 201                 free_percpu(v->stats);
 202         v->stats = NULL;
 203         kfree(v);
 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                 if (br_opt_get(br, BROPT_VLAN_STATS_PER_PORT)) {
 262                         v->stats = netdev_alloc_pcpu_stats(struct br_vlan_stats);
 263                         if (!v->stats) {
 264                                 err = -ENOMEM;
 265                                 goto out_filt;
 266                         }
 267                 } else {
 268                         v->stats = masterv->stats;
 269                 }
 270         } else {
 271                 err = br_switchdev_port_vlan_add(dev, v->vid, flags);
 272                 if (err && err != -EOPNOTSUPP)
 273                         goto out;
 274         }
 275
 276         /* Add the dev mac and count the vlan only if it's usable */
 277         if (br_vlan_should_use(v)) {
 278                 err = br_fdb_insert(br, p, dev->dev_addr, v->vid);
 279                 if (err) {
 280                         br_err(br, "failed insert local address into bridge forwarding table\n");
 281                         goto out_filt;
 282                 }
 283                 vg->num_vlans++;
 284         }
 285
 286         err = rhashtable_lookup_insert_fast(&vg->vlan_hash, &v->vnode,
 287                                             br_vlan_rht_params);
 288         if (err)
 289                 goto out_fdb_insert;
 290
 291         __vlan_add_list(v);
 292         __vlan_add_flags(v, flags);
 293 out:
 294         return err;
 295
 296 out_fdb_insert:
 297         if (br_vlan_should_use(v)) {
 298                 br_fdb_find_delete_local(br, p, dev->dev_addr, v->vid);
 299                 vg->num_vlans--;
 300         }
 301
 302 out_filt:
 303         if (p) {
 304                 __vlan_vid_del(dev, br, v->vid);
 305                 if (masterv) {
 306                         br_vlan_put_master(masterv);
 307                         v->brvlan = NULL;
 308                 }
 309         } else {
 310                 br_switchdev_port_vlan_del(dev, v->vid);
 311         }
 312
 313         goto out;
 314 }
 315
 316 static int __vlan_del(struct net_bridge_vlan *v)
 317 {
 318         struct net_bridge_vlan *masterv = v;
 319         struct net_bridge_vlan_group *vg;
 320         struct net_bridge_port *p = NULL;
 321         int err = 0;
 322
 323         if (br_vlan_is_master(v)) {
 324                 vg = br_vlan_group(v->br);
 325         } else {
 326                 p = v->port;
 327                 vg = nbp_vlan_group(v->port);
 328                 masterv = v->brvlan;
 329         }
 330
 331         __vlan_delete_pvid(vg, v->vid);
 332         if (p) {
 333                 err = __vlan_vid_del(p->dev, p->br, v->vid);
 334                 if (err)
 335                         goto out;
 336         } else {
 337                 err = br_switchdev_port_vlan_del(v->br->dev, v->vid);
 338                 if (err && err != -EOPNOTSUPP)
 339                         goto out;
 340                 err = 0;
 341         }
 342
 343         if (br_vlan_should_use(v)) {
 344                 v->flags &= ~BRIDGE_VLAN_INFO_BRENTRY;
 345                 vg->num_vlans--;
 346         }
 347
 348         if (masterv != v) {
 349                 vlan_tunnel_info_del(vg, v);
 350                 rhashtable_remove_fast(&vg->vlan_hash, &v->vnode,
 351                                        br_vlan_rht_params);
 352                 __vlan_del_list(v);
 353                 call_rcu(&v->rcu, nbp_vlan_rcu_free);
 354         }
 355
 356         br_vlan_put_master(masterv);
 357 out:
 358         return err;
 359 }
 360
 361 static void __vlan_group_free(struct net_bridge_vlan_group *vg)
 362 {
 363         WARN_ON(!list_empty(&vg->vlan_list));
 364         rhashtable_destroy(&vg->vlan_hash);
 365         vlan_tunnel_deinit(vg);
 366         kfree(vg);
 367 }
 368
 369 static void __vlan_flush(struct net_bridge_vlan_group *vg)
 370 {
 371         struct net_bridge_vlan *vlan, *tmp;
 372
 373         __vlan_delete_pvid(vg, vg->pvid);
 374         list_for_each_entry_safe(vlan, tmp, &vg->vlan_list, vlist)
 375                 __vlan_del(vlan);
 376 }
 377
 378 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 379                                const struct net_bridge_port *p,
 380                                struct net_bridge_vlan_group *vg,
 381                                struct sk_buff *skb)
 382 {
 383         struct br_vlan_stats *stats;
 384         struct net_bridge_vlan *v;
 385         u16 vid;
 386
 387         /* If this packet was not filtered at input, let it pass */
 388         if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
 389                 goto out;
 390
 391         /* At this point, we know that the frame was filtered and contains
 392          * a valid vlan id.  If the vlan id has untagged flag set,
 393          * send untagged; otherwise, send tagged.
 394          */
 395         br_vlan_get_tag(skb, &vid);
 396         v = br_vlan_find(vg, vid);
 397         /* Vlan entry must be configured at this point.  The
 398          * only exception is the bridge is set in promisc mode and the
 399          * packet is destined for the bridge device.  In this case
 400          * pass the packet as is.
 401          */
 402         if (!v || !br_vlan_should_use(v)) {
 403                 if ((br->dev->flags & IFF_PROMISC) && skb->dev == br->dev) {
 404                         goto out;
 405                 } else {
 406                         kfree_skb(skb);
 407                         return NULL;
 408                 }
 409         }
 410         if (br_opt_get(br, BROPT_VLAN_STATS_ENABLED)) {
 411                 stats = this_cpu_ptr(v->stats);
 412                 u64_stats_update_begin(&stats->syncp);
 413                 stats->tx_bytes += skb->len;
 414                 stats->tx_packets++;
 415                 u64_stats_update_end(&stats->syncp);
 416         }
 417
 418         if (v->flags & BRIDGE_VLAN_INFO_UNTAGGED)
 419                 skb->vlan_tci = 0;
 420
 421         if (p && (p->flags & BR_VLAN_TUNNEL) &&
 422             br_handle_egress_vlan_tunnel(skb, v)) {
 423                 kfree_skb(skb);
 424                 return NULL;
 425         }
 426 out:
 427         return skb;
 428 }
 429
 430 /* Called under RCU */
 431 static bool __allowed_ingress(const struct net_bridge *br,
 432                               struct net_bridge_vlan_group *vg,
 433                               struct sk_buff *skb, u16 *vid)
 434 {
 435         struct br_vlan_stats *stats;
 436         struct net_bridge_vlan *v;
 437         bool tagged;
 438
 439         BR_INPUT_SKB_CB(skb)->vlan_filtered = true;
 440         /* If vlan tx offload is disabled on bridge device and frame was
 441          * sent from vlan device on the bridge device, it does not have
 442          * HW accelerated vlan tag.
 443          */
 444         if (unlikely(!skb_vlan_tag_present(skb) &&
 445                      skb->protocol == br->vlan_proto)) {
 446                 skb = skb_vlan_untag(skb);
 447                 if (unlikely(!skb))
 448                         return false;
 449         }
 450
 451         if (!br_vlan_get_tag(skb, vid)) {
 452                 /* Tagged frame */
 453                 if (skb->vlan_proto != br->vlan_proto) {
 454                         /* Protocol-mismatch, empty out vlan_tci for new tag */
 455                         skb_push(skb, ETH_HLEN);
 456                         skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto,
 457                                                         skb_vlan_tag_get(skb));
 458                         if (unlikely(!skb))
 459                                 return false;
 460
 461                         skb_pull(skb, ETH_HLEN);
 462                         skb_reset_mac_len(skb);
 463                         *vid = 0;
 464                         tagged = false;
 465                 } else {
 466                         tagged = true;
 467                 }
 468         } else {
 469                 /* Untagged frame */
 470                 tagged = false;
 471         }
 472
 473         if (!*vid) {
 474                 u16 pvid = br_get_pvid(vg);
 475
 476                 /* Frame had a tag with VID 0 or did not have a tag.
 477                  * See if pvid is set on this port.  That tells us which
 478                  * vlan untagged or priority-tagged traffic belongs to.
 479                  */
 480                 if (!pvid)
 481                         goto drop;
 482
 483                 /* PVID is set on this port.  Any untagged or priority-tagged
 484                  * ingress frame is considered to belong to this vlan.
 485                  */
 486                 *vid = pvid;
 487                 if (likely(!tagged))
 488                         /* Untagged Frame. */
 489                         __vlan_hwaccel_put_tag(skb, br->vlan_proto, pvid);
 490                 else
 491                         /* Priority-tagged Frame.
 492                          * At this point, We know that skb->vlan_tci had
 493                          * VLAN_TAG_PRESENT bit and its VID field was 0x000.
 494                          * We update only VID field and preserve PCP field.
 495                          */
 496                         skb->vlan_tci |= pvid;
 497
 498                 /* if stats are disabled we can avoid the lookup */
 499                 if (!br_opt_get(br, BROPT_VLAN_STATS_ENABLED))
 500                         return true;
 501         }
 502         v = br_vlan_find(vg, *vid);
 503         if (!v || !br_vlan_should_use(v))
 504                 goto drop;
 505
 506         if (br_opt_get(br, BROPT_VLAN_STATS_ENABLED)) {
 507                 stats = this_cpu_ptr(v->stats);
 508                 u64_stats_update_begin(&stats->syncp);
 509                 stats->rx_bytes += skb->len;
 510                 stats->rx_packets++;
 511                 u64_stats_update_end(&stats->syncp);
 512         }
 513
 514         return true;
 515
 516 drop:
 517         kfree_skb(skb);
 518         return false;
 519 }
 520
 521 bool br_allowed_ingress(const struct net_bridge *br,
 522                         struct net_bridge_vlan_group *vg, struct sk_buff *skb,
 523                         u16 *vid)
 524 {
 525         /* If VLAN filtering is disabled on the bridge, all packets are
 526          * permitted.
 527          */
 528         if (!br_opt_get(br, BROPT_VLAN_ENABLED)) {
 529                 BR_INPUT_SKB_CB(skb)->vlan_filtered = false;
 530                 return true;
 531         }
 532
 533         return __allowed_ingress(br, vg, skb, vid);
 534 }
 535
 536 /* Called under RCU. */
 537 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 538                        const struct sk_buff *skb)
 539 {
 540         const struct net_bridge_vlan *v;
 541         u16 vid;
 542
 543         /* If this packet was not filtered at input, let it pass */
 544         if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
 545                 return true;
 546
 547         br_vlan_get_tag(skb, &vid);
 548         v = br_vlan_find(vg, vid);
 549         if (v && br_vlan_should_use(v))
 550                 return true;
 551
 552         return false;
 553 }
 554
 555 /* Called under RCU */
 556 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid)
 557 {
 558         struct net_bridge_vlan_group *vg;
 559         struct net_bridge *br = p->br;
 560
 561         /* If filtering was disabled at input, let it pass. */
 562         if (!br_opt_get(br, BROPT_VLAN_ENABLED))
 563                 return true;
 564
 565         vg = nbp_vlan_group_rcu(p);
 566         if (!vg || !vg->num_vlans)
 567                 return false;
 568
 569         if (!br_vlan_get_tag(skb, vid) && skb->vlan_proto != br->vlan_proto)
 570                 *vid = 0;
 571
 572         if (!*vid) {
 573                 *vid = br_get_pvid(vg);
 574                 if (!*vid)
 575                         return false;
 576
 577                 return true;
 578         }
 579
 580         if (br_vlan_find(vg, *vid))
 581                 return true;
 582
 583         return false;
 584 }
 585
 586 static int br_vlan_add_existing(struct net_bridge *br,
 587                                 struct net_bridge_vlan_group *vg,
 588                                 struct net_bridge_vlan *vlan,
 589                                 u16 flags, bool *changed)
 590 {
 591         int err;
 592
 593         err = br_switchdev_port_vlan_add(br->dev, vlan->vid, flags);
 594         if (err && err != -EOPNOTSUPP)
 595                 return err;
 596
 597         if (!br_vlan_is_brentry(vlan)) {
 598                 /* Trying to change flags of non-existent bridge vlan */
 599                 if (!(flags & BRIDGE_VLAN_INFO_BRENTRY)) {
 600                         err = -EINVAL;
 601                         goto err_flags;
 602                 }
 603                 /* It was only kept for port vlans, now make it real */
 604                 err = br_fdb_insert(br, NULL, br->dev->dev_addr,
 605                                     vlan->vid);
 606                 if (err) {
 607                         br_err(br, "failed to insert local address into bridge forwarding table\n");
 608                         goto err_fdb_insert;
 609                 }
 610
 611                 refcount_inc(&vlan->refcnt);
 612                 vlan->flags |= BRIDGE_VLAN_INFO_BRENTRY;
 613                 vg->num_vlans++;
 614                 *changed = true;
 615         }
 616
 617         if (__vlan_add_flags(vlan, flags))
 618                 *changed = true;
 619
 620         return 0;
 621
 622 err_fdb_insert:
 623 err_flags:
 624         br_switchdev_port_vlan_del(br->dev, vlan->vid);
 625         return err;
 626 }
 627
 628 /* Must be protected by RTNL.
 629  * Must be called with vid in range from 1 to 4094 inclusive.
 630  * changed must be true only if the vlan was created or updated
 631  */
 632 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, bool *changed)
 633 {
 634         struct net_bridge_vlan_group *vg;
 635         struct net_bridge_vlan *vlan;
 636         int ret;
 637
 638         ASSERT_RTNL();
 639
 640         *changed = false;
 641         vg = br_vlan_group(br);
 642         vlan = br_vlan_find(vg, vid);
 643         if (vlan)
 644                 return br_vlan_add_existing(br, vg, vlan, flags, changed);
 645
 646         vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
 647         if (!vlan)
 648                 return -ENOMEM;
 649
 650         vlan->stats = netdev_alloc_pcpu_stats(struct br_vlan_stats);
 651         if (!vlan->stats) {
 652                 kfree(vlan);
 653                 return -ENOMEM;
 654         }
 655         vlan->vid = vid;
 656         vlan->flags = flags | BRIDGE_VLAN_INFO_MASTER;
 657         vlan->flags &= ~BRIDGE_VLAN_INFO_PVID;
 658         vlan->br = br;
 659         if (flags & BRIDGE_VLAN_INFO_BRENTRY)
 660                 refcount_set(&vlan->refcnt, 1);
 661         ret = __vlan_add(vlan, flags);
 662         if (ret) {
 663                 free_percpu(vlan->stats);
 664                 kfree(vlan);
 665         } else {
 666                 *changed = true;
 667         }
 668
 669         return ret;
 670 }
 671
 672 /* Must be protected by RTNL.
 673  * Must be called with vid in range from 1 to 4094 inclusive.
 674  */
 675 int br_vlan_delete(struct net_bridge *br, u16 vid)
 676 {
 677         struct net_bridge_vlan_group *vg;
 678         struct net_bridge_vlan *v;
 679
 680         ASSERT_RTNL();
 681
 682         vg = br_vlan_group(br);
 683         v = br_vlan_find(vg, vid);
 684         if (!v || !br_vlan_is_brentry(v))
 685                 return -ENOENT;
 686
 687         br_fdb_find_delete_local(br, NULL, br->dev->dev_addr, vid);
 688         br_fdb_delete_by_port(br, NULL, vid, 0);
 689
 690         vlan_tunnel_info_del(vg, v);
 691
 692         return __vlan_del(v);
 693 }
 694
 695 void br_vlan_flush(struct net_bridge *br)
 696 {
 697         struct net_bridge_vlan_group *vg;
 698
 699         ASSERT_RTNL();
 700
 701         vg = br_vlan_group(br);
 702         __vlan_flush(vg);
 703         RCU_INIT_POINTER(br->vlgrp, NULL);
 704         synchronize_rcu();
 705         __vlan_group_free(vg);
 706 }
 707
 708 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid)
 709 {
 710         if (!vg)
 711                 return NULL;
 712
 713         return br_vlan_lookup(&vg->vlan_hash, vid);
 714 }
 715
 716 /* Must be protected by RTNL. */
 717 static void recalculate_group_addr(struct net_bridge *br)
 718 {
 719         if (br_opt_get(br, BROPT_GROUP_ADDR_SET))
 720                 return;
 721
 722         spin_lock_bh(&br->lock);
 723         if (!br_opt_get(br, BROPT_VLAN_ENABLED) ||
 724             br->vlan_proto == htons(ETH_P_8021Q)) {
 725                 /* Bridge Group Address */
 726                 br->group_addr[5] = 0x00;
 727         } else { /* vlan_enabled && ETH_P_8021AD */
 728                 /* Provider Bridge Group Address */
 729                 br->group_addr[5] = 0x08;
 730         }
 731         spin_unlock_bh(&br->lock);
 732 }
 733
 734 /* Must be protected by RTNL. */
 735 void br_recalculate_fwd_mask(struct net_bridge *br)
 736 {
 737         if (!br_opt_get(br, BROPT_VLAN_ENABLED) ||
 738             br->vlan_proto == htons(ETH_P_8021Q))
 739                 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
 740         else /* vlan_enabled && ETH_P_8021AD */
 741                 br->group_fwd_mask_required = BR_GROUPFWD_8021AD &
 742                                               ~(1u << br->group_addr[5]);
 743 }
 744
 745 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
 746 {
 747         struct switchdev_attr attr = {
 748                 .orig_dev = br->dev,
 749                 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
 750                 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
 751                 .u.vlan_filtering = val,
 752         };
 753         int err;
 754
 755         if (br_opt_get(br, BROPT_VLAN_ENABLED) == !!val)
 756                 return 0;
 757
 758         err = switchdev_port_attr_set(br->dev, &attr);
 759         if (err && err != -EOPNOTSUPP)
 760                 return err;
 761
 762         br_opt_toggle(br, BROPT_VLAN_ENABLED, !!val);
 763         br_manage_promisc(br);
 764         recalculate_group_addr(br);
 765         br_recalculate_fwd_mask(br);
 766
 767         return 0;
 768 }
 769
 770 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
 771 {
 772         return __br_vlan_filter_toggle(br, val);
 773 }
 774
 775 bool br_vlan_enabled(const struct net_device *dev)
 776 {
 777         struct net_bridge *br = netdev_priv(dev);
 778
 779         return br_opt_get(br, BROPT_VLAN_ENABLED);
 780 }
 781 EXPORT_SYMBOL_GPL(br_vlan_enabled);
 782
 783 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto)
 784 {
 785         int err = 0;
 786         struct net_bridge_port *p;
 787         struct net_bridge_vlan *vlan;
 788         struct net_bridge_vlan_group *vg;
 789         __be16 oldproto;
 790
 791         if (br->vlan_proto == proto)
 792                 return 0;
 793
 794         /* Add VLANs for the new proto to the device filter. */
 795         list_for_each_entry(p, &br->port_list, list) {
 796                 vg = nbp_vlan_group(p);
 797                 list_for_each_entry(vlan, &vg->vlan_list, vlist) {
 798                         err = vlan_vid_add(p->dev, proto, vlan->vid);
 799                         if (err)
 800                                 goto err_filt;
 801                 }
 802         }
 803
 804         oldproto = br->vlan_proto;
 805         br->vlan_proto = proto;
 806
 807         recalculate_group_addr(br);
 808         br_recalculate_fwd_mask(br);
 809
 810         /* Delete VLANs for the old proto from the device filter. */
 811         list_for_each_entry(p, &br->port_list, list) {
 812                 vg = nbp_vlan_group(p);
 813                 list_for_each_entry(vlan, &vg->vlan_list, vlist)
 814                         vlan_vid_del(p->dev, oldproto, vlan->vid);
 815         }
 816
 817         return 0;
 818
 819 err_filt:
 820         list_for_each_entry_continue_reverse(vlan, &vg->vlan_list, vlist)
 821                 vlan_vid_del(p->dev, proto, vlan->vid);
 822
 823         list_for_each_entry_continue_reverse(p, &br->port_list, list) {
 824                 vg = nbp_vlan_group(p);
 825                 list_for_each_entry(vlan, &vg->vlan_list, vlist)
 826                         vlan_vid_del(p->dev, proto, vlan->vid);
 827         }
 828
 829         return err;
 830 }
 831
 832 int br_vlan_set_proto(struct net_bridge *br, unsigned long val)
 833 {
 834         if (val != ETH_P_8021Q && val != ETH_P_8021AD)
 835                 return -EPROTONOSUPPORT;
 836
 837         return __br_vlan_set_proto(br, htons(val));
 838 }
 839
 840 int br_vlan_set_stats(struct net_bridge *br, unsigned long val)
 841 {
 842         switch (val) {
 843         case 0:
 844         case 1:
 845                 br_opt_toggle(br, BROPT_VLAN_STATS_ENABLED, !!val);
 846                 break;
 847         default:
 848                 return -EINVAL;
 849         }
 850
 851         return 0;
 852 }
 853
 854 int br_vlan_set_stats_per_port(struct net_bridge *br, unsigned long val)
 855 {
 856         struct net_bridge_port *p;
 857
 858         /* allow to change the option if there are no port vlans configured */
 859         list_for_each_entry(p, &br->port_list, list) {
 860                 struct net_bridge_vlan_group *vg = nbp_vlan_group(p);
 861
 862                 if (vg->num_vlans)
 863                         return -EBUSY;
 864         }
 865
 866         switch (val) {
 867         case 0:
 868         case 1:
 869                 br_opt_toggle(br, BROPT_VLAN_STATS_PER_PORT, !!val);
 870                 break;
 871         default:
 872                 return -EINVAL;
 873         }
 874
 875         return 0;
 876 }
 877
 878 static bool vlan_default_pvid(struct net_bridge_vlan_group *vg, u16 vid)
 879 {
 880         struct net_bridge_vlan *v;
 881
 882         if (vid != vg->pvid)
 883                 return false;
 884
 885         v = br_vlan_lookup(&vg->vlan_hash, vid);
 886         if (v && br_vlan_should_use(v) &&
 887             (v->flags & BRIDGE_VLAN_INFO_UNTAGGED))
 888                 return true;
 889
 890         return false;
 891 }
 892
 893 static void br_vlan_disable_default_pvid(struct net_bridge *br)
 894 {
 895         struct net_bridge_port *p;
 896         u16 pvid = br->default_pvid;
 897
 898         /* Disable default_pvid on all ports where it is still
 899          * configured.
 900          */
 901         if (vlan_default_pvid(br_vlan_group(br), pvid))
 902                 br_vlan_delete(br, pvid);
 903
 904         list_for_each_entry(p, &br->port_list, list) {
 905                 if (vlan_default_pvid(nbp_vlan_group(p), pvid))
 906                         nbp_vlan_delete(p, pvid);
 907         }
 908
 909         br->default_pvid = 0;
 910 }
 911
 912 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid)
 913 {
 914         const struct net_bridge_vlan *pvent;
 915         struct net_bridge_vlan_group *vg;
 916         struct net_bridge_port *p;
 917         unsigned long *changed;
 918         bool vlchange;
 919         u16 old_pvid;
 920         int err = 0;
 921
 922         if (!pvid) {
 923                 br_vlan_disable_default_pvid(br);
 924                 return 0;
 925         }
 926
 927         changed = bitmap_zalloc(BR_MAX_PORTS, GFP_KERNEL);
 928         if (!changed)
 929                 return -ENOMEM;
 930
 931         old_pvid = br->default_pvid;
 932
 933         /* Update default_pvid config only if we do not conflict with
 934          * user configuration.
 935          */
 936         vg = br_vlan_group(br);
 937         pvent = br_vlan_find(vg, pvid);
 938         if ((!old_pvid || vlan_default_pvid(vg, old_pvid)) &&
 939             (!pvent || !br_vlan_should_use(pvent))) {
 940                 err = br_vlan_add(br, pvid,
 941                                   BRIDGE_VLAN_INFO_PVID |
 942                                   BRIDGE_VLAN_INFO_UNTAGGED |
 943                                   BRIDGE_VLAN_INFO_BRENTRY,
 944                                   &vlchange);
 945                 if (err)
 946                         goto out;
 947                 br_vlan_delete(br, old_pvid);
 948                 set_bit(0, changed);
 949         }
 950
 951         list_for_each_entry(p, &br->port_list, list) {
 952                 /* Update default_pvid config only if we do not conflict with
 953                  * user configuration.
 954                  */
 955                 vg = nbp_vlan_group(p);
 956                 if ((old_pvid &&
 957                      !vlan_default_pvid(vg, old_pvid)) ||
 958                     br_vlan_find(vg, pvid))
 959                         continue;
 960
 961                 err = nbp_vlan_add(p, pvid,
 962                                    BRIDGE_VLAN_INFO_PVID |
 963                                    BRIDGE_VLAN_INFO_UNTAGGED,
 964                                    &vlchange);
 965                 if (err)
 966                         goto err_port;
 967                 nbp_vlan_delete(p, old_pvid);
 968                 set_bit(p->port_no, changed);
 969         }
 970
 971         br->default_pvid = pvid;
 972
 973 out:
 974         bitmap_free(changed);
 975         return err;
 976
 977 err_port:
 978         list_for_each_entry_continue_reverse(p, &br->port_list, list) {
 979                 if (!test_bit(p->port_no, changed))
 980                         continue;
 981
 982                 if (old_pvid)
 983                         nbp_vlan_add(p, old_pvid,
 984                                      BRIDGE_VLAN_INFO_PVID |
 985                                      BRIDGE_VLAN_INFO_UNTAGGED,
 986                                      &vlchange);
 987                 nbp_vlan_delete(p, pvid);
 988         }
 989
 990         if (test_bit(0, changed)) {
 991                 if (old_pvid)
 992                         br_vlan_add(br, old_pvid,
 993                                     BRIDGE_VLAN_INFO_PVID |
 994                                     BRIDGE_VLAN_INFO_UNTAGGED |
 995                                     BRIDGE_VLAN_INFO_BRENTRY,
 996                                     &vlchange);
 997                 br_vlan_delete(br, pvid);
 998         }
 999         goto out;
1000 }
1001
1002 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val)
1003 {
1004         u16 pvid = val;
1005         int err = 0;
1006
1007         if (val >= VLAN_VID_MASK)
1008                 return -EINVAL;
1009
1010         if (pvid == br->default_pvid)
1011                 goto out;
1012
1013         /* Only allow default pvid change when filtering is disabled */
1014         if (br_opt_get(br, BROPT_VLAN_ENABLED)) {
1015                 pr_info_once("Please disable vlan filtering to change default_pvid\n");
1016                 err = -EPERM;
1017                 goto out;
1018         }
1019         err = __br_vlan_set_default_pvid(br, pvid);
1020 out:
1021         return err;
1022 }
1023
1024 int br_vlan_init(struct net_bridge *br)
1025 {
1026         struct net_bridge_vlan_group *vg;
1027         int ret = -ENOMEM;
1028         bool changed;
1029
1030         vg = kzalloc(sizeof(*vg), GFP_KERNEL);
1031         if (!vg)
1032                 goto out;
1033         ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params);
1034         if (ret)
1035                 goto err_rhtbl;
1036         ret = vlan_tunnel_init(vg);
1037         if (ret)
1038                 goto err_tunnel_init;
1039         INIT_LIST_HEAD(&vg->vlan_list);
1040         br->vlan_proto = htons(ETH_P_8021Q);
1041         br->default_pvid = 1;
1042         rcu_assign_pointer(br->vlgrp, vg);
1043         ret = br_vlan_add(br, 1,
1044                           BRIDGE_VLAN_INFO_PVID | BRIDGE_VLAN_INFO_UNTAGGED |
1045                           BRIDGE_VLAN_INFO_BRENTRY, &changed);
1046         if (ret)
1047                 goto err_vlan_add;
1048
1049 out:
1050         return ret;
1051
1052 err_vlan_add:
1053         vlan_tunnel_deinit(vg);
1054 err_tunnel_init:
1055         rhashtable_destroy(&vg->vlan_hash);
1056 err_rhtbl:
1057         kfree(vg);
1058
1059         goto out;
1060 }
1061
1062 int nbp_vlan_init(struct net_bridge_port *p)
1063 {
1064         struct switchdev_attr attr = {
1065                 .orig_dev = p->br->dev,
1066                 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
1067                 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
1068                 .u.vlan_filtering = br_opt_get(p->br, BROPT_VLAN_ENABLED),
1069         };
1070         struct net_bridge_vlan_group *vg;
1071         int ret = -ENOMEM;
1072
1073         vg = kzalloc(sizeof(struct net_bridge_vlan_group), GFP_KERNEL);
1074         if (!vg)
1075                 goto out;
1076
1077         ret = switchdev_port_attr_set(p->dev, &attr);
1078         if (ret && ret != -EOPNOTSUPP)
1079                 goto err_vlan_enabled;
1080
1081         ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params);
1082         if (ret)
1083                 goto err_rhtbl;
1084         ret = vlan_tunnel_init(vg);
1085         if (ret)
1086                 goto err_tunnel_init;
1087         INIT_LIST_HEAD(&vg->vlan_list);
1088         rcu_assign_pointer(p->vlgrp, vg);
1089         if (p->br->default_pvid) {
1090                 bool changed;
1091
1092                 ret = nbp_vlan_add(p, p->br->default_pvid,
1093                                    BRIDGE_VLAN_INFO_PVID |
1094                                    BRIDGE_VLAN_INFO_UNTAGGED,
1095                                    &changed);
1096                 if (ret)
1097                         goto err_vlan_add;
1098         }
1099 out:
1100         return ret;
1101
1102 err_vlan_add:
1103         RCU_INIT_POINTER(p->vlgrp, NULL);
1104         synchronize_rcu();
1105         vlan_tunnel_deinit(vg);
1106 err_tunnel_init:
1107         rhashtable_destroy(&vg->vlan_hash);
1108 err_rhtbl:
1109 err_vlan_enabled:
1110         kfree(vg);
1111
1112         goto out;
1113 }
1114
1115 /* Must be protected by RTNL.
1116  * Must be called with vid in range from 1 to 4094 inclusive.
1117  * changed must be true only if the vlan was created or updated
1118  */
1119 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
1120                  bool *changed)
1121 {
1122         struct net_bridge_vlan *vlan;
1123         int ret;
1124
1125         ASSERT_RTNL();
1126
1127         *changed = false;
1128         vlan = br_vlan_find(nbp_vlan_group(port), vid);
1129         if (vlan) {
1130                 /* Pass the flags to the hardware bridge */
1131                 ret = br_switchdev_port_vlan_add(port->dev, vid, flags);
1132                 if (ret && ret != -EOPNOTSUPP)
1133                         return ret;
1134                 *changed = __vlan_add_flags(vlan, flags);
1135
1136                 return 0;
1137         }
1138
1139         vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
1140         if (!vlan)
1141                 return -ENOMEM;
1142
1143         vlan->vid = vid;
1144         vlan->port = port;
1145         ret = __vlan_add(vlan, flags);
1146         if (ret)
1147                 kfree(vlan);
1148         else
1149                 *changed = true;
1150
1151         return ret;
1152 }
1153
1154 /* Must be protected by RTNL.
1155  * Must be called with vid in range from 1 to 4094 inclusive.
1156  */
1157 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
1158 {
1159         struct net_bridge_vlan *v;
1160
1161         ASSERT_RTNL();
1162
1163         v = br_vlan_find(nbp_vlan_group(port), vid);
1164         if (!v)
1165                 return -ENOENT;
1166         br_fdb_find_delete_local(port->br, port, port->dev->dev_addr, vid);
1167         br_fdb_delete_by_port(port->br, port, vid, 0);
1168
1169         return __vlan_del(v);
1170 }
1171
1172 void nbp_vlan_flush(struct net_bridge_port *port)
1173 {
1174         struct net_bridge_vlan_group *vg;
1175
1176         ASSERT_RTNL();
1177
1178         vg = nbp_vlan_group(port);
1179         __vlan_flush(vg);
1180         RCU_INIT_POINTER(port->vlgrp, NULL);
1181         synchronize_rcu();
1182         __vlan_group_free(vg);
1183 }
1184
1185 void br_vlan_get_stats(const struct net_bridge_vlan *v,
1186                        struct br_vlan_stats *stats)
1187 {
1188         int i;
1189
1190         memset(stats, 0, sizeof(*stats));
1191         for_each_possible_cpu(i) {
1192                 u64 rxpackets, rxbytes, txpackets, txbytes;
1193                 struct br_vlan_stats *cpu_stats;
1194                 unsigned int start;
1195
1196                 cpu_stats = per_cpu_ptr(v->stats, i);
1197                 do {
1198                         start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1199                         rxpackets = cpu_stats->rx_packets;
1200                         rxbytes = cpu_stats->rx_bytes;
1201                         txbytes = cpu_stats->tx_bytes;
1202                         txpackets = cpu_stats->tx_packets;
1203                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
1204
1205                 stats->rx_packets += rxpackets;
1206                 stats->rx_bytes += rxbytes;
1207                 stats->tx_bytes += txbytes;
1208                 stats->tx_packets += txpackets;
1209         }
1210 }
1211
1212 int br_vlan_get_pvid(const struct net_device *dev, u16 *p_pvid)
1213 {
1214         struct net_bridge_vlan_group *vg;
1215
1216         ASSERT_RTNL();
1217         if (netif_is_bridge_master(dev))
1218                 vg = br_vlan_group(netdev_priv(dev));
1219         else
1220                 return -EINVAL;
1221
1222         *p_pvid = br_get_pvid(vg);
1223         return 0;
1224 }
1225 EXPORT_SYMBOL_GPL(br_vlan_get_pvid);
1226
1227 int br_vlan_get_info(const struct net_device *dev, u16 vid,
1228                      struct bridge_vlan_info *p_vinfo)
1229 {
1230         struct net_bridge_vlan_group *vg;
1231         struct net_bridge_vlan *v;
1232         struct net_bridge_port *p;
1233
1234         ASSERT_RTNL();
1235         p = br_port_get_check_rtnl(dev);
1236         if (p)
1237                 vg = nbp_vlan_group(p);
1238         else if (netif_is_bridge_master(dev))
1239                 vg = br_vlan_group(netdev_priv(dev));
1240         else
1241                 return -EINVAL;
1242
1243         v = br_vlan_find(vg, vid);
1244         if (!v)
1245                 return -ENOENT;
1246
1247         p_vinfo->vid = vid;
1248         p_vinfo->flags = v->flags;
1249         return 0;
1250 }
1251 EXPORT_SYMBOL_GPL(br_vlan_get_info);