net/bridge/br_vlan.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 #include <linux/kernel.h>
   3 #include <linux/netdevice.h>
   4 #include <linux/rtnetlink.h>
   5 #include <linux/slab.h>
   6 #include <net/switchdev.h>
   7
   8 #include "br_private.h"
   9 #include "br_private_tunnel.h"
  10
  11 static void nbp_vlan_set_vlan_dev_state(struct net_bridge_port *p, u16 vid);
  12
  13 static inline int br_vlan_cmp(struct rhashtable_compare_arg *arg,
  14                               const void *ptr)
  15 {
  16         const struct net_bridge_vlan *vle = ptr;
  17         u16 vid = *(u16 *)arg->key;
  18
  19         return vle->vid != vid;
  20 }
  21
  22 static const struct rhashtable_params br_vlan_rht_params = {
  23         .head_offset = offsetof(struct net_bridge_vlan, vnode),
  24         .key_offset = offsetof(struct net_bridge_vlan, vid),
  25         .key_len = sizeof(u16),
  26         .nelem_hint = 3,
  27         .max_size = VLAN_N_VID,
  28         .obj_cmpfn = br_vlan_cmp,
  29         .automatic_shrinking = true,
  30 };
  31
  32 static struct net_bridge_vlan *br_vlan_lookup(struct rhashtable *tbl, u16 vid)
  33 {
  34         return rhashtable_lookup_fast(tbl, &vid, br_vlan_rht_params);
  35 }
  36
  37 static bool __vlan_add_pvid(struct net_bridge_vlan_group *vg, u16 vid)
  38 {
  39         if (vg->pvid == vid)
  40                 return false;
  41
  42         smp_wmb();
  43         vg->pvid = vid;
  44
  45         return true;
  46 }
  47
  48 static bool __vlan_delete_pvid(struct net_bridge_vlan_group *vg, u16 vid)
  49 {
  50         if (vg->pvid != vid)
  51                 return false;
  52
  53         smp_wmb();
  54         vg->pvid = 0;
  55
  56         return true;
  57 }
  58
  59 /* return true if anything changed, false otherwise */
  60 static bool __vlan_add_flags(struct net_bridge_vlan *v, u16 flags)
  61 {
  62         struct net_bridge_vlan_group *vg;
  63         u16 old_flags = v->flags;
  64         bool ret;
  65
  66         if (br_vlan_is_master(v))
  67                 vg = br_vlan_group(v->br);
  68         else
  69                 vg = nbp_vlan_group(v->port);
  70
  71         if (flags & BRIDGE_VLAN_INFO_PVID)
  72                 ret = __vlan_add_pvid(vg, v->vid);
  73         else
  74                 ret = __vlan_delete_pvid(vg, v->vid);
  75
  76         if (flags & BRIDGE_VLAN_INFO_UNTAGGED)
  77                 v->flags |= BRIDGE_VLAN_INFO_UNTAGGED;
  78         else
  79                 v->flags &= ~BRIDGE_VLAN_INFO_UNTAGGED;
  80
  81         return ret || !!(old_flags ^ v->flags);
  82 }
  83
  84 static int __vlan_vid_add(struct net_device *dev, struct net_bridge *br,
  85                           struct net_bridge_vlan *v, u16 flags,
  86                           struct netlink_ext_ack *extack)
  87 {
  88         int err;
  89
  90         /* Try switchdev op first. In case it is not supported, fallback to
  91          * 8021q add.
  92          */
  93         err = br_switchdev_port_vlan_add(dev, v->vid, flags, extack);
  94         if (err == -EOPNOTSUPP)
  95                 return vlan_vid_add(dev, br->vlan_proto, v->vid);
  96         v->priv_flags |= BR_VLFLAG_ADDED_BY_SWITCHDEV;
  97         return err;
  98 }
  99
 100 static void __vlan_add_list(struct net_bridge_vlan *v)
 101 {
 102         struct net_bridge_vlan_group *vg;
 103         struct list_head *headp, *hpos;
 104         struct net_bridge_vlan *vent;
 105
 106         if (br_vlan_is_master(v))
 107                 vg = br_vlan_group(v->br);
 108         else
 109                 vg = nbp_vlan_group(v->port);
 110
 111         headp = &vg->vlan_list;
 112         list_for_each_prev(hpos, headp) {
 113                 vent = list_entry(hpos, struct net_bridge_vlan, vlist);
 114                 if (v->vid < vent->vid)
 115                         continue;
 116                 else
 117                         break;
 118         }
 119         list_add_rcu(&v->vlist, hpos);
 120 }
 121
 122 static void __vlan_del_list(struct net_bridge_vlan *v)
 123 {
 124         list_del_rcu(&v->vlist);
 125 }
 126
 127 static int __vlan_vid_del(struct net_device *dev, struct net_bridge *br,
 128                           const struct net_bridge_vlan *v)
 129 {
 130         int err;
 131
 132         /* Try switchdev op first. In case it is not supported, fallback to
 133          * 8021q del.
 134          */
 135         err = br_switchdev_port_vlan_del(dev, v->vid);
 136         if (!(v->priv_flags & BR_VLFLAG_ADDED_BY_SWITCHDEV))
 137                 vlan_vid_del(dev, br->vlan_proto, v->vid);
 138         return err == -EOPNOTSUPP ? 0 : err;
 139 }
 140
 141 /* Returns a master vlan, if it didn't exist it gets created. In all cases a
 142  * a reference is taken to the master vlan before returning.
 143  */
 144 static struct net_bridge_vlan *
 145 br_vlan_get_master(struct net_bridge *br, u16 vid,
 146                    struct netlink_ext_ack *extack)
 147 {
 148         struct net_bridge_vlan_group *vg;
 149         struct net_bridge_vlan *masterv;
 150
 151         vg = br_vlan_group(br);
 152         masterv = br_vlan_find(vg, vid);
 153         if (!masterv) {
 154                 bool changed;
 155
 156                 /* missing global ctx, create it now */
 157                 if (br_vlan_add(br, vid, 0, &changed, extack))
 158                         return NULL;
 159                 masterv = br_vlan_find(vg, vid);
 160                 if (WARN_ON(!masterv))
 161                         return NULL;
 162                 refcount_set(&masterv->refcnt, 1);
 163                 return masterv;
 164         }
 165         refcount_inc(&masterv->refcnt);
 166
 167         return masterv;
 168 }
 169
 170 static void br_master_vlan_rcu_free(struct rcu_head *rcu)
 171 {
 172         struct net_bridge_vlan *v;
 173
 174         v = container_of(rcu, struct net_bridge_vlan, rcu);
 175         WARN_ON(!br_vlan_is_master(v));
 176         free_percpu(v->stats);
 177         v->stats = NULL;
 178         kfree(v);
 179 }
 180
 181 static void br_vlan_put_master(struct net_bridge_vlan *masterv)
 182 {
 183         struct net_bridge_vlan_group *vg;
 184
 185         if (!br_vlan_is_master(masterv))
 186                 return;
 187
 188         vg = br_vlan_group(masterv->br);
 189         if (refcount_dec_and_test(&masterv->refcnt)) {
 190                 rhashtable_remove_fast(&vg->vlan_hash,
 191                                        &masterv->vnode, br_vlan_rht_params);
 192                 __vlan_del_list(masterv);
 193                 call_rcu(&masterv->rcu, br_master_vlan_rcu_free);
 194         }
 195 }
 196
 197 static void nbp_vlan_rcu_free(struct rcu_head *rcu)
 198 {
 199         struct net_bridge_vlan *v;
 200
 201         v = container_of(rcu, struct net_bridge_vlan, rcu);
 202         WARN_ON(br_vlan_is_master(v));
 203         /* if we had per-port stats configured then free them here */
 204         if (v->priv_flags & BR_VLFLAG_PER_PORT_STATS)
 205                 free_percpu(v->stats);
 206         v->stats = NULL;
 207         kfree(v);
 208 }
 209
 210 /* This is the shared VLAN add function which works for both ports and bridge
 211  * devices. There are four possible calls to this function in terms of the
 212  * vlan entry type:
 213  * 1. vlan is being added on a port (no master flags, global entry exists)
 214  * 2. vlan is being added on a bridge (both master and brentry flags)
 215  * 3. vlan is being added on a port, but a global entry didn't exist which
 216  *    is being created right now (master flag set, brentry flag unset), the
 217  *    global entry is used for global per-vlan features, but not for filtering
 218  * 4. same as 3 but with both master and brentry flags set so the entry
 219  *    will be used for filtering in both the port and the bridge
 220  */
 221 static int __vlan_add(struct net_bridge_vlan *v, u16 flags,
 222                       struct netlink_ext_ack *extack)
 223 {
 224         struct net_bridge_vlan *masterv = NULL;
 225         struct net_bridge_port *p = NULL;
 226         struct net_bridge_vlan_group *vg;
 227         struct net_device *dev;
 228         struct net_bridge *br;
 229         int err;
 230
 231         if (br_vlan_is_master(v)) {
 232                 br = v->br;
 233                 dev = br->dev;
 234                 vg = br_vlan_group(br);
 235         } else {
 236                 p = v->port;
 237                 br = p->br;
 238                 dev = p->dev;
 239                 vg = nbp_vlan_group(p);
 240         }
 241
 242         if (p) {
 243                 /* Add VLAN to the device filter if it is supported.
 244                  * This ensures tagged traffic enters the bridge when
 245                  * promiscuous mode is disabled by br_manage_promisc().
 246                  */
 247                 err = __vlan_vid_add(dev, br, v, flags, extack);
 248                 if (err)
 249                         goto out;
 250
 251                 /* need to work on the master vlan too */
 252                 if (flags & BRIDGE_VLAN_INFO_MASTER) {
 253                         bool changed;
 254
 255                         err = br_vlan_add(br, v->vid,
 256                                           flags | BRIDGE_VLAN_INFO_BRENTRY,
 257                                           &changed, extack);
 258                         if (err)
 259                                 goto out_filt;
 260                 }
 261
 262                 masterv = br_vlan_get_master(br, v->vid, extack);
 263                 if (!masterv)
 264                         goto out_filt;
 265                 v->brvlan = masterv;
 266                 if (br_opt_get(br, BROPT_VLAN_STATS_PER_PORT)) {
 267                         v->stats = netdev_alloc_pcpu_stats(struct br_vlan_stats);
 268                         if (!v->stats) {
 269                                 err = -ENOMEM;
 270                                 goto out_filt;
 271                         }
 272                         v->priv_flags |= BR_VLFLAG_PER_PORT_STATS;
 273                 } else {
 274                         v->stats = masterv->stats;
 275                 }
 276         } else {
 277                 err = br_switchdev_port_vlan_add(dev, v->vid, flags, extack);
 278                 if (err && err != -EOPNOTSUPP)
 279                         goto out;
 280         }
 281
 282         /* Add the dev mac and count the vlan only if it's usable */
 283         if (br_vlan_should_use(v)) {
 284                 err = br_fdb_insert(br, p, dev->dev_addr, v->vid);
 285                 if (err) {
 286                         br_err(br, "failed insert local address into bridge forwarding table\n");
 287                         goto out_filt;
 288                 }
 289                 vg->num_vlans++;
 290         }
 291
 292         err = rhashtable_lookup_insert_fast(&vg->vlan_hash, &v->vnode,
 293                                             br_vlan_rht_params);
 294         if (err)
 295                 goto out_fdb_insert;
 296
 297         __vlan_add_list(v);
 298         __vlan_add_flags(v, flags);
 299
 300         if (p)
 301                 nbp_vlan_set_vlan_dev_state(p, v->vid);
 302 out:
 303         return err;
 304
 305 out_fdb_insert:
 306         if (br_vlan_should_use(v)) {
 307                 br_fdb_find_delete_local(br, p, dev->dev_addr, v->vid);
 308                 vg->num_vlans--;
 309         }
 310
 311 out_filt:
 312         if (p) {
 313                 __vlan_vid_del(dev, br, v);
 314                 if (masterv) {
 315                         if (v->stats && masterv->stats != v->stats)
 316                                 free_percpu(v->stats);
 317                         v->stats = NULL;
 318
 319                         br_vlan_put_master(masterv);
 320                         v->brvlan = NULL;
 321                 }
 322         } else {
 323                 br_switchdev_port_vlan_del(dev, v->vid);
 324         }
 325
 326         goto out;
 327 }
 328
 329 static int __vlan_del(struct net_bridge_vlan *v)
 330 {
 331         struct net_bridge_vlan *masterv = v;
 332         struct net_bridge_vlan_group *vg;
 333         struct net_bridge_port *p = NULL;
 334         int err = 0;
 335
 336         if (br_vlan_is_master(v)) {
 337                 vg = br_vlan_group(v->br);
 338         } else {
 339                 p = v->port;
 340                 vg = nbp_vlan_group(v->port);
 341                 masterv = v->brvlan;
 342         }
 343
 344         __vlan_delete_pvid(vg, v->vid);
 345         if (p) {
 346                 err = __vlan_vid_del(p->dev, p->br, v);
 347                 if (err)
 348                         goto out;
 349         } else {
 350                 err = br_switchdev_port_vlan_del(v->br->dev, v->vid);
 351                 if (err && err != -EOPNOTSUPP)
 352                         goto out;
 353                 err = 0;
 354         }
 355
 356         if (br_vlan_should_use(v)) {
 357                 v->flags &= ~BRIDGE_VLAN_INFO_BRENTRY;
 358                 vg->num_vlans--;
 359         }
 360
 361         if (masterv != v) {
 362                 vlan_tunnel_info_del(vg, v);
 363                 rhashtable_remove_fast(&vg->vlan_hash, &v->vnode,
 364                                        br_vlan_rht_params);
 365                 __vlan_del_list(v);
 366                 nbp_vlan_set_vlan_dev_state(p, v->vid);
 367                 call_rcu(&v->rcu, nbp_vlan_rcu_free);
 368         }
 369
 370         br_vlan_put_master(masterv);
 371 out:
 372         return err;
 373 }
 374
 375 static void __vlan_group_free(struct net_bridge_vlan_group *vg)
 376 {
 377         WARN_ON(!list_empty(&vg->vlan_list));
 378         rhashtable_destroy(&vg->vlan_hash);
 379         vlan_tunnel_deinit(vg);
 380         kfree(vg);
 381 }
 382
 383 static void __vlan_flush(struct net_bridge_vlan_group *vg)
 384 {
 385         struct net_bridge_vlan *vlan, *tmp;
 386
 387         __vlan_delete_pvid(vg, vg->pvid);
 388         list_for_each_entry_safe(vlan, tmp, &vg->vlan_list, vlist)
 389                 __vlan_del(vlan);
 390 }
 391
 392 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 393                                const struct net_bridge_port *p,
 394                                struct net_bridge_vlan_group *vg,
 395                                struct sk_buff *skb)
 396 {
 397         struct br_vlan_stats *stats;
 398         struct net_bridge_vlan *v;
 399         u16 vid;
 400
 401         /* If this packet was not filtered at input, let it pass */
 402         if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
 403                 goto out;
 404
 405         /* At this point, we know that the frame was filtered and contains
 406          * a valid vlan id.  If the vlan id has untagged flag set,
 407          * send untagged; otherwise, send tagged.
 408          */
 409         br_vlan_get_tag(skb, &vid);
 410         v = br_vlan_find(vg, vid);
 411         /* Vlan entry must be configured at this point.  The
 412          * only exception is the bridge is set in promisc mode and the
 413          * packet is destined for the bridge device.  In this case
 414          * pass the packet as is.
 415          */
 416         if (!v || !br_vlan_should_use(v)) {
 417                 if ((br->dev->flags & IFF_PROMISC) && skb->dev == br->dev) {
 418                         goto out;
 419                 } else {
 420                         kfree_skb(skb);
 421                         return NULL;
 422                 }
 423         }
 424         if (br_opt_get(br, BROPT_VLAN_STATS_ENABLED)) {
 425                 stats = this_cpu_ptr(v->stats);
 426                 u64_stats_update_begin(&stats->syncp);
 427                 stats->tx_bytes += skb->len;
 428                 stats->tx_packets++;
 429                 u64_stats_update_end(&stats->syncp);
 430         }
 431
 432         if (v->flags & BRIDGE_VLAN_INFO_UNTAGGED)
 433                 __vlan_hwaccel_clear_tag(skb);
 434
 435         if (p && (p->flags & BR_VLAN_TUNNEL) &&
 436             br_handle_egress_vlan_tunnel(skb, v)) {
 437                 kfree_skb(skb);
 438                 return NULL;
 439         }
 440 out:
 441         return skb;
 442 }
 443
 444 /* Called under RCU */
 445 static bool __allowed_ingress(const struct net_bridge *br,
 446                               struct net_bridge_vlan_group *vg,
 447                               struct sk_buff *skb, u16 *vid)
 448 {
 449         struct br_vlan_stats *stats;
 450         struct net_bridge_vlan *v;
 451         bool tagged;
 452
 453         BR_INPUT_SKB_CB(skb)->vlan_filtered = true;
 454         /* If vlan tx offload is disabled on bridge device and frame was
 455          * sent from vlan device on the bridge device, it does not have
 456          * HW accelerated vlan tag.
 457          */
 458         if (unlikely(!skb_vlan_tag_present(skb) &&
 459                      skb->protocol == br->vlan_proto)) {
 460                 skb = skb_vlan_untag(skb);
 461                 if (unlikely(!skb))
 462                         return false;
 463         }
 464
 465         if (!br_vlan_get_tag(skb, vid)) {
 466                 /* Tagged frame */
 467                 if (skb->vlan_proto != br->vlan_proto) {
 468                         /* Protocol-mismatch, empty out vlan_tci for new tag */
 469                         skb_push(skb, ETH_HLEN);
 470                         skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto,
 471                                                         skb_vlan_tag_get(skb));
 472                         if (unlikely(!skb))
 473                                 return false;
 474
 475                         skb_pull(skb, ETH_HLEN);
 476                         skb_reset_mac_len(skb);
 477                         *vid = 0;
 478                         tagged = false;
 479                 } else {
 480                         tagged = true;
 481                 }
 482         } else {
 483                 /* Untagged frame */
 484                 tagged = false;
 485         }
 486
 487         if (!*vid) {
 488                 u16 pvid = br_get_pvid(vg);
 489
 490                 /* Frame had a tag with VID 0 or did not have a tag.
 491                  * See if pvid is set on this port.  That tells us which
 492                  * vlan untagged or priority-tagged traffic belongs to.
 493                  */
 494                 if (!pvid)
 495                         goto drop;
 496
 497                 /* PVID is set on this port.  Any untagged or priority-tagged
 498                  * ingress frame is considered to belong to this vlan.
 499                  */
 500                 *vid = pvid;
 501                 if (likely(!tagged))
 502                         /* Untagged Frame. */
 503                         __vlan_hwaccel_put_tag(skb, br->vlan_proto, pvid);
 504                 else
 505                         /* Priority-tagged Frame.
 506                          * At this point, we know that skb->vlan_tci VID
 507                          * field was 0.
 508                          * We update only VID field and preserve PCP field.
 509                          */
 510                         skb->vlan_tci |= pvid;
 511
 512                 /* if stats are disabled we can avoid the lookup */
 513                 if (!br_opt_get(br, BROPT_VLAN_STATS_ENABLED))
 514                         return true;
 515         }
 516         v = br_vlan_find(vg, *vid);
 517         if (!v || !br_vlan_should_use(v))
 518                 goto drop;
 519
 520         if (br_opt_get(br, BROPT_VLAN_STATS_ENABLED)) {
 521                 stats = this_cpu_ptr(v->stats);
 522                 u64_stats_update_begin(&stats->syncp);
 523                 stats->rx_bytes += skb->len;
 524                 stats->rx_packets++;
 525                 u64_stats_update_end(&stats->syncp);
 526         }
 527
 528         return true;
 529
 530 drop:
 531         kfree_skb(skb);
 532         return false;
 533 }
 534
 535 bool br_allowed_ingress(const struct net_bridge *br,
 536                         struct net_bridge_vlan_group *vg, struct sk_buff *skb,
 537                         u16 *vid)
 538 {
 539         /* If VLAN filtering is disabled on the bridge, all packets are
 540          * permitted.
 541          */
 542         if (!br_opt_get(br, BROPT_VLAN_ENABLED)) {
 543                 BR_INPUT_SKB_CB(skb)->vlan_filtered = false;
 544                 return true;
 545         }
 546
 547         return __allowed_ingress(br, vg, skb, vid);
 548 }
 549
 550 /* Called under RCU. */
 551 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 552                        const struct sk_buff *skb)
 553 {
 554         const struct net_bridge_vlan *v;
 555         u16 vid;
 556
 557         /* If this packet was not filtered at input, let it pass */
 558         if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
 559                 return true;
 560
 561         br_vlan_get_tag(skb, &vid);
 562         v = br_vlan_find(vg, vid);
 563         if (v && br_vlan_should_use(v))
 564                 return true;
 565
 566         return false;
 567 }
 568
 569 /* Called under RCU */
 570 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid)
 571 {
 572         struct net_bridge_vlan_group *vg;
 573         struct net_bridge *br = p->br;
 574
 575         /* If filtering was disabled at input, let it pass. */
 576         if (!br_opt_get(br, BROPT_VLAN_ENABLED))
 577                 return true;
 578
 579         vg = nbp_vlan_group_rcu(p);
 580         if (!vg || !vg->num_vlans)
 581                 return false;
 582
 583         if (!br_vlan_get_tag(skb, vid) && skb->vlan_proto != br->vlan_proto)
 584                 *vid = 0;
 585
 586         if (!*vid) {
 587                 *vid = br_get_pvid(vg);
 588                 if (!*vid)
 589                         return false;
 590
 591                 return true;
 592         }
 593
 594         if (br_vlan_find(vg, *vid))
 595                 return true;
 596
 597         return false;
 598 }
 599
 600 static int br_vlan_add_existing(struct net_bridge *br,
 601                                 struct net_bridge_vlan_group *vg,
 602                                 struct net_bridge_vlan *vlan,
 603                                 u16 flags, bool *changed,
 604                                 struct netlink_ext_ack *extack)
 605 {
 606         int err;
 607
 608         err = br_switchdev_port_vlan_add(br->dev, vlan->vid, flags, extack);
 609         if (err && err != -EOPNOTSUPP)
 610                 return err;
 611
 612         if (!br_vlan_is_brentry(vlan)) {
 613                 /* Trying to change flags of non-existent bridge vlan */
 614                 if (!(flags & BRIDGE_VLAN_INFO_BRENTRY)) {
 615                         err = -EINVAL;
 616                         goto err_flags;
 617                 }
 618                 /* It was only kept for port vlans, now make it real */
 619                 err = br_fdb_insert(br, NULL, br->dev->dev_addr,
 620                                     vlan->vid);
 621                 if (err) {
 622                         br_err(br, "failed to insert local address into bridge forwarding table\n");
 623                         goto err_fdb_insert;
 624                 }
 625
 626                 refcount_inc(&vlan->refcnt);
 627                 vlan->flags |= BRIDGE_VLAN_INFO_BRENTRY;
 628                 vg->num_vlans++;
 629                 *changed = true;
 630         }
 631
 632         if (__vlan_add_flags(vlan, flags))
 633                 *changed = true;
 634
 635         return 0;
 636
 637 err_fdb_insert:
 638 err_flags:
 639         br_switchdev_port_vlan_del(br->dev, vlan->vid);
 640         return err;
 641 }
 642
 643 /* Must be protected by RTNL.
 644  * Must be called with vid in range from 1 to 4094 inclusive.
 645  * changed must be true only if the vlan was created or updated
 646  */
 647 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, bool *changed,
 648                 struct netlink_ext_ack *extack)
 649 {
 650         struct net_bridge_vlan_group *vg;
 651         struct net_bridge_vlan *vlan;
 652         int ret;
 653
 654         ASSERT_RTNL();
 655
 656         *changed = false;
 657         vg = br_vlan_group(br);
 658         vlan = br_vlan_find(vg, vid);
 659         if (vlan)
 660                 return br_vlan_add_existing(br, vg, vlan, flags, changed,
 661                                             extack);
 662
 663         vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
 664         if (!vlan)
 665                 return -ENOMEM;
 666
 667         vlan->stats = netdev_alloc_pcpu_stats(struct br_vlan_stats);
 668         if (!vlan->stats) {
 669                 kfree(vlan);
 670                 return -ENOMEM;
 671         }
 672         vlan->vid = vid;
 673         vlan->flags = flags | BRIDGE_VLAN_INFO_MASTER;
 674         vlan->flags &= ~BRIDGE_VLAN_INFO_PVID;
 675         vlan->br = br;
 676         if (flags & BRIDGE_VLAN_INFO_BRENTRY)
 677                 refcount_set(&vlan->refcnt, 1);
 678         ret = __vlan_add(vlan, flags, extack);
 679         if (ret) {
 680                 free_percpu(vlan->stats);
 681                 kfree(vlan);
 682         } else {
 683                 *changed = true;
 684         }
 685
 686         return ret;
 687 }
 688
 689 /* Must be protected by RTNL.
 690  * Must be called with vid in range from 1 to 4094 inclusive.
 691  */
 692 int br_vlan_delete(struct net_bridge *br, u16 vid)
 693 {
 694         struct net_bridge_vlan_group *vg;
 695         struct net_bridge_vlan *v;
 696
 697         ASSERT_RTNL();
 698
 699         vg = br_vlan_group(br);
 700         v = br_vlan_find(vg, vid);
 701         if (!v || !br_vlan_is_brentry(v))
 702                 return -ENOENT;
 703
 704         br_fdb_find_delete_local(br, NULL, br->dev->dev_addr, vid);
 705         br_fdb_delete_by_port(br, NULL, vid, 0);
 706
 707         vlan_tunnel_info_del(vg, v);
 708
 709         return __vlan_del(v);
 710 }
 711
 712 void br_vlan_flush(struct net_bridge *br)
 713 {
 714         struct net_bridge_vlan_group *vg;
 715
 716         ASSERT_RTNL();
 717
 718         vg = br_vlan_group(br);
 719         __vlan_flush(vg);
 720         RCU_INIT_POINTER(br->vlgrp, NULL);
 721         synchronize_rcu();
 722         __vlan_group_free(vg);
 723 }
 724
 725 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid)
 726 {
 727         if (!vg)
 728                 return NULL;
 729
 730         return br_vlan_lookup(&vg->vlan_hash, vid);
 731 }
 732
 733 /* Must be protected by RTNL. */
 734 static void recalculate_group_addr(struct net_bridge *br)
 735 {
 736         if (br_opt_get(br, BROPT_GROUP_ADDR_SET))
 737                 return;
 738
 739         spin_lock_bh(&br->lock);
 740         if (!br_opt_get(br, BROPT_VLAN_ENABLED) ||
 741             br->vlan_proto == htons(ETH_P_8021Q)) {
 742                 /* Bridge Group Address */
 743                 br->group_addr[5] = 0x00;
 744         } else { /* vlan_enabled && ETH_P_8021AD */
 745                 /* Provider Bridge Group Address */
 746                 br->group_addr[5] = 0x08;
 747         }
 748         spin_unlock_bh(&br->lock);
 749 }
 750
 751 /* Must be protected by RTNL. */
 752 void br_recalculate_fwd_mask(struct net_bridge *br)
 753 {
 754         if (!br_opt_get(br, BROPT_VLAN_ENABLED) ||
 755             br->vlan_proto == htons(ETH_P_8021Q))
 756                 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
 757         else /* vlan_enabled && ETH_P_8021AD */
 758                 br->group_fwd_mask_required = BR_GROUPFWD_8021AD &
 759                                               ~(1u << br->group_addr[5]);
 760 }
 761
 762 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
 763 {
 764         struct switchdev_attr attr = {
 765                 .orig_dev = br->dev,
 766                 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
 767                 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
 768                 .u.vlan_filtering = val,
 769         };
 770         int err;
 771
 772         if (br_opt_get(br, BROPT_VLAN_ENABLED) == !!val)
 773                 return 0;
 774
 775         err = switchdev_port_attr_set(br->dev, &attr);
 776         if (err && err != -EOPNOTSUPP)
 777                 return err;
 778
 779         br_opt_toggle(br, BROPT_VLAN_ENABLED, !!val);
 780         br_manage_promisc(br);
 781         recalculate_group_addr(br);
 782         br_recalculate_fwd_mask(br);
 783
 784         return 0;
 785 }
 786
 787 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
 788 {
 789         return __br_vlan_filter_toggle(br, val);
 790 }
 791
 792 bool br_vlan_enabled(const struct net_device *dev)
 793 {
 794         struct net_bridge *br = netdev_priv(dev);
 795
 796         return br_opt_get(br, BROPT_VLAN_ENABLED);
 797 }
 798 EXPORT_SYMBOL_GPL(br_vlan_enabled);
 799
 800 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto)
 801 {
 802         int err = 0;
 803         struct net_bridge_port *p;
 804         struct net_bridge_vlan *vlan;
 805         struct net_bridge_vlan_group *vg;
 806         __be16 oldproto;
 807
 808         if (br->vlan_proto == proto)
 809                 return 0;
 810
 811         /* Add VLANs for the new proto to the device filter. */
 812         list_for_each_entry(p, &br->port_list, list) {
 813                 vg = nbp_vlan_group(p);
 814                 list_for_each_entry(vlan, &vg->vlan_list, vlist) {
 815                         err = vlan_vid_add(p->dev, proto, vlan->vid);
 816                         if (err)
 817                                 goto err_filt;
 818                 }
 819         }
 820
 821         oldproto = br->vlan_proto;
 822         br->vlan_proto = proto;
 823
 824         recalculate_group_addr(br);
 825         br_recalculate_fwd_mask(br);
 826
 827         /* Delete VLANs for the old proto from the device filter. */
 828         list_for_each_entry(p, &br->port_list, list) {
 829                 vg = nbp_vlan_group(p);
 830                 list_for_each_entry(vlan, &vg->vlan_list, vlist)
 831                         vlan_vid_del(p->dev, oldproto, vlan->vid);
 832         }
 833
 834         return 0;
 835
 836 err_filt:
 837         list_for_each_entry_continue_reverse(vlan, &vg->vlan_list, vlist)
 838                 vlan_vid_del(p->dev, proto, vlan->vid);
 839
 840         list_for_each_entry_continue_reverse(p, &br->port_list, list) {
 841                 vg = nbp_vlan_group(p);
 842                 list_for_each_entry(vlan, &vg->vlan_list, vlist)
 843                         vlan_vid_del(p->dev, proto, vlan->vid);
 844         }
 845
 846         return err;
 847 }
 848
 849 int br_vlan_set_proto(struct net_bridge *br, unsigned long val)
 850 {
 851         if (val != ETH_P_8021Q && val != ETH_P_8021AD)
 852                 return -EPROTONOSUPPORT;
 853
 854         return __br_vlan_set_proto(br, htons(val));
 855 }
 856
 857 int br_vlan_set_stats(struct net_bridge *br, unsigned long val)
 858 {
 859         switch (val) {
 860         case 0:
 861         case 1:
 862                 br_opt_toggle(br, BROPT_VLAN_STATS_ENABLED, !!val);
 863                 break;
 864         default:
 865                 return -EINVAL;
 866         }
 867
 868         return 0;
 869 }
 870
 871 int br_vlan_set_stats_per_port(struct net_bridge *br, unsigned long val)
 872 {
 873         struct net_bridge_port *p;
 874
 875         /* allow to change the option if there are no port vlans configured */
 876         list_for_each_entry(p, &br->port_list, list) {
 877                 struct net_bridge_vlan_group *vg = nbp_vlan_group(p);
 878
 879                 if (vg->num_vlans)
 880                         return -EBUSY;
 881         }
 882
 883         switch (val) {
 884         case 0:
 885         case 1:
 886                 br_opt_toggle(br, BROPT_VLAN_STATS_PER_PORT, !!val);
 887                 break;
 888         default:
 889                 return -EINVAL;
 890         }
 891
 892         return 0;
 893 }
 894
 895 static bool vlan_default_pvid(struct net_bridge_vlan_group *vg, u16 vid)
 896 {
 897         struct net_bridge_vlan *v;
 898
 899         if (vid != vg->pvid)
 900                 return false;
 901
 902         v = br_vlan_lookup(&vg->vlan_hash, vid);
 903         if (v && br_vlan_should_use(v) &&
 904             (v->flags & BRIDGE_VLAN_INFO_UNTAGGED))
 905                 return true;
 906
 907         return false;
 908 }
 909
 910 static void br_vlan_disable_default_pvid(struct net_bridge *br)
 911 {
 912         struct net_bridge_port *p;
 913         u16 pvid = br->default_pvid;
 914
 915         /* Disable default_pvid on all ports where it is still
 916          * configured.
 917          */
 918         if (vlan_default_pvid(br_vlan_group(br), pvid))
 919                 br_vlan_delete(br, pvid);
 920
 921         list_for_each_entry(p, &br->port_list, list) {
 922                 if (vlan_default_pvid(nbp_vlan_group(p), pvid))
 923                         nbp_vlan_delete(p, pvid);
 924         }
 925
 926         br->default_pvid = 0;
 927 }
 928
 929 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid,
 930                                struct netlink_ext_ack *extack)
 931 {
 932         const struct net_bridge_vlan *pvent;
 933         struct net_bridge_vlan_group *vg;
 934         struct net_bridge_port *p;
 935         unsigned long *changed;
 936         bool vlchange;
 937         u16 old_pvid;
 938         int err = 0;
 939
 940         if (!pvid) {
 941                 br_vlan_disable_default_pvid(br);
 942                 return 0;
 943         }
 944
 945         changed = bitmap_zalloc(BR_MAX_PORTS, GFP_KERNEL);
 946         if (!changed)
 947                 return -ENOMEM;
 948
 949         old_pvid = br->default_pvid;
 950
 951         /* Update default_pvid config only if we do not conflict with
 952          * user configuration.
 953          */
 954         vg = br_vlan_group(br);
 955         pvent = br_vlan_find(vg, pvid);
 956         if ((!old_pvid || vlan_default_pvid(vg, old_pvid)) &&
 957             (!pvent || !br_vlan_should_use(pvent))) {
 958                 err = br_vlan_add(br, pvid,
 959                                   BRIDGE_VLAN_INFO_PVID |
 960                                   BRIDGE_VLAN_INFO_UNTAGGED |
 961                                   BRIDGE_VLAN_INFO_BRENTRY,
 962                                   &vlchange, extack);
 963                 if (err)
 964                         goto out;
 965                 br_vlan_delete(br, old_pvid);
 966                 set_bit(0, changed);
 967         }
 968
 969         list_for_each_entry(p, &br->port_list, list) {
 970                 /* Update default_pvid config only if we do not conflict with
 971                  * user configuration.
 972                  */
 973                 vg = nbp_vlan_group(p);
 974                 if ((old_pvid &&
 975                      !vlan_default_pvid(vg, old_pvid)) ||
 976                     br_vlan_find(vg, pvid))
 977                         continue;
 978
 979                 err = nbp_vlan_add(p, pvid,
 980                                    BRIDGE_VLAN_INFO_PVID |
 981                                    BRIDGE_VLAN_INFO_UNTAGGED,
 982                                    &vlchange, extack);
 983                 if (err)
 984                         goto err_port;
 985                 nbp_vlan_delete(p, old_pvid);
 986                 set_bit(p->port_no, changed);
 987         }
 988
 989         br->default_pvid = pvid;
 990
 991 out:
 992         bitmap_free(changed);
 993         return err;
 994
 995 err_port:
 996         list_for_each_entry_continue_reverse(p, &br->port_list, list) {
 997                 if (!test_bit(p->port_no, changed))
 998                         continue;
 999
1000                 if (old_pvid)
1001                         nbp_vlan_add(p, old_pvid,
1002                                      BRIDGE_VLAN_INFO_PVID |
1003                                      BRIDGE_VLAN_INFO_UNTAGGED,
1004                                      &vlchange, NULL);
1005                 nbp_vlan_delete(p, pvid);
1006         }
1007
1008         if (test_bit(0, changed)) {
1009                 if (old_pvid)
1010                         br_vlan_add(br, old_pvid,
1011                                     BRIDGE_VLAN_INFO_PVID |
1012                                     BRIDGE_VLAN_INFO_UNTAGGED |
1013                                     BRIDGE_VLAN_INFO_BRENTRY,
1014                                     &vlchange, NULL);
1015                 br_vlan_delete(br, pvid);
1016         }
1017         goto out;
1018 }
1019
1020 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val)
1021 {
1022         u16 pvid = val;
1023         int err = 0;
1024
1025         if (val >= VLAN_VID_MASK)
1026                 return -EINVAL;
1027
1028         if (pvid == br->default_pvid)
1029                 goto out;
1030
1031         /* Only allow default pvid change when filtering is disabled */
1032         if (br_opt_get(br, BROPT_VLAN_ENABLED)) {
1033                 pr_info_once("Please disable vlan filtering to change default_pvid\n");
1034                 err = -EPERM;
1035                 goto out;
1036         }
1037         err = __br_vlan_set_default_pvid(br, pvid, NULL);
1038 out:
1039         return err;
1040 }
1041
1042 int br_vlan_init(struct net_bridge *br)
1043 {
1044         struct net_bridge_vlan_group *vg;
1045         int ret = -ENOMEM;
1046         bool changed;
1047
1048         vg = kzalloc(sizeof(*vg), GFP_KERNEL);
1049         if (!vg)
1050                 goto out;
1051         ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params);
1052         if (ret)
1053                 goto err_rhtbl;
1054         ret = vlan_tunnel_init(vg);
1055         if (ret)
1056                 goto err_tunnel_init;
1057         INIT_LIST_HEAD(&vg->vlan_list);
1058         br->vlan_proto = htons(ETH_P_8021Q);
1059         br->default_pvid = 1;
1060         rcu_assign_pointer(br->vlgrp, vg);
1061         ret = br_vlan_add(br, 1,
1062                           BRIDGE_VLAN_INFO_PVID | BRIDGE_VLAN_INFO_UNTAGGED |
1063                           BRIDGE_VLAN_INFO_BRENTRY, &changed, NULL);
1064         if (ret)
1065                 goto err_vlan_add;
1066
1067 out:
1068         return ret;
1069
1070 err_vlan_add:
1071         vlan_tunnel_deinit(vg);
1072 err_tunnel_init:
1073         rhashtable_destroy(&vg->vlan_hash);
1074 err_rhtbl:
1075         kfree(vg);
1076
1077         goto out;
1078 }
1079
1080 int nbp_vlan_init(struct net_bridge_port *p, struct netlink_ext_ack *extack)
1081 {
1082         struct switchdev_attr attr = {
1083                 .orig_dev = p->br->dev,
1084                 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
1085                 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
1086                 .u.vlan_filtering = br_opt_get(p->br, BROPT_VLAN_ENABLED),
1087         };
1088         struct net_bridge_vlan_group *vg;
1089         int ret = -ENOMEM;
1090
1091         vg = kzalloc(sizeof(struct net_bridge_vlan_group), GFP_KERNEL);
1092         if (!vg)
1093                 goto out;
1094
1095         ret = switchdev_port_attr_set(p->dev, &attr);
1096         if (ret && ret != -EOPNOTSUPP)
1097                 goto err_vlan_enabled;
1098
1099         ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params);
1100         if (ret)
1101                 goto err_rhtbl;
1102         ret = vlan_tunnel_init(vg);
1103         if (ret)
1104                 goto err_tunnel_init;
1105         INIT_LIST_HEAD(&vg->vlan_list);
1106         rcu_assign_pointer(p->vlgrp, vg);
1107         if (p->br->default_pvid) {
1108                 bool changed;
1109
1110                 ret = nbp_vlan_add(p, p->br->default_pvid,
1111                                    BRIDGE_VLAN_INFO_PVID |
1112                                    BRIDGE_VLAN_INFO_UNTAGGED,
1113                                    &changed, extack);
1114                 if (ret)
1115                         goto err_vlan_add;
1116         }
1117 out:
1118         return ret;
1119
1120 err_vlan_add:
1121         RCU_INIT_POINTER(p->vlgrp, NULL);
1122         synchronize_rcu();
1123         vlan_tunnel_deinit(vg);
1124 err_tunnel_init:
1125         rhashtable_destroy(&vg->vlan_hash);
1126 err_rhtbl:
1127 err_vlan_enabled:
1128         kfree(vg);
1129
1130         goto out;
1131 }
1132
1133 /* Must be protected by RTNL.
1134  * Must be called with vid in range from 1 to 4094 inclusive.
1135  * changed must be true only if the vlan was created or updated
1136  */
1137 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
1138                  bool *changed, struct netlink_ext_ack *extack)
1139 {
1140         struct net_bridge_vlan *vlan;
1141         int ret;
1142
1143         ASSERT_RTNL();
1144
1145         *changed = false;
1146         vlan = br_vlan_find(nbp_vlan_group(port), vid);
1147         if (vlan) {
1148                 /* Pass the flags to the hardware bridge */
1149                 ret = br_switchdev_port_vlan_add(port->dev, vid, flags, extack);
1150                 if (ret && ret != -EOPNOTSUPP)
1151                         return ret;
1152                 *changed = __vlan_add_flags(vlan, flags);
1153
1154                 return 0;
1155         }
1156
1157         vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
1158         if (!vlan)
1159                 return -ENOMEM;
1160
1161         vlan->vid = vid;
1162         vlan->port = port;
1163         ret = __vlan_add(vlan, flags, extack);
1164         if (ret)
1165                 kfree(vlan);
1166         else
1167                 *changed = true;
1168
1169         return ret;
1170 }
1171
1172 /* Must be protected by RTNL.
1173  * Must be called with vid in range from 1 to 4094 inclusive.
1174  */
1175 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
1176 {
1177         struct net_bridge_vlan *v;
1178
1179         ASSERT_RTNL();
1180
1181         v = br_vlan_find(nbp_vlan_group(port), vid);
1182         if (!v)
1183                 return -ENOENT;
1184         br_fdb_find_delete_local(port->br, port, port->dev->dev_addr, vid);
1185         br_fdb_delete_by_port(port->br, port, vid, 0);
1186
1187         return __vlan_del(v);
1188 }
1189
1190 void nbp_vlan_flush(struct net_bridge_port *port)
1191 {
1192         struct net_bridge_vlan_group *vg;
1193
1194         ASSERT_RTNL();
1195
1196         vg = nbp_vlan_group(port);
1197         __vlan_flush(vg);
1198         RCU_INIT_POINTER(port->vlgrp, NULL);
1199         synchronize_rcu();
1200         __vlan_group_free(vg);
1201 }
1202
1203 void br_vlan_get_stats(const struct net_bridge_vlan *v,
1204                        struct br_vlan_stats *stats)
1205 {
1206         int i;
1207
1208         memset(stats, 0, sizeof(*stats));
1209         for_each_possible_cpu(i) {
1210                 u64 rxpackets, rxbytes, txpackets, txbytes;
1211                 struct br_vlan_stats *cpu_stats;
1212                 unsigned int start;
1213
1214                 cpu_stats = per_cpu_ptr(v->stats, i);
1215                 do {
1216                         start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1217                         rxpackets = cpu_stats->rx_packets;
1218                         rxbytes = cpu_stats->rx_bytes;
1219                         txbytes = cpu_stats->tx_bytes;
1220                         txpackets = cpu_stats->tx_packets;
1221                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
1222
1223                 stats->rx_packets += rxpackets;
1224                 stats->rx_bytes += rxbytes;
1225                 stats->tx_bytes += txbytes;
1226                 stats->tx_packets += txpackets;
1227         }
1228 }
1229
1230 int br_vlan_get_pvid(const struct net_device *dev, u16 *p_pvid)
1231 {
1232         struct net_bridge_vlan_group *vg;
1233         struct net_bridge_port *p;
1234
1235         ASSERT_RTNL();
1236         p = br_port_get_check_rtnl(dev);
1237         if (p)
1238                 vg = nbp_vlan_group(p);
1239         else if (netif_is_bridge_master(dev))
1240                 vg = br_vlan_group(netdev_priv(dev));
1241         else
1242                 return -EINVAL;
1243
1244         *p_pvid = br_get_pvid(vg);
1245         return 0;
1246 }
1247 EXPORT_SYMBOL_GPL(br_vlan_get_pvid);
1248
1249 int br_vlan_get_info(const struct net_device *dev, u16 vid,
1250                      struct bridge_vlan_info *p_vinfo)
1251 {
1252         struct net_bridge_vlan_group *vg;
1253         struct net_bridge_vlan *v;
1254         struct net_bridge_port *p;
1255
1256         ASSERT_RTNL();
1257         p = br_port_get_check_rtnl(dev);
1258         if (p)
1259                 vg = nbp_vlan_group(p);
1260         else if (netif_is_bridge_master(dev))
1261                 vg = br_vlan_group(netdev_priv(dev));
1262         else
1263                 return -EINVAL;
1264
1265         v = br_vlan_find(vg, vid);
1266         if (!v)
1267                 return -ENOENT;
1268
1269         p_vinfo->vid = vid;
1270         p_vinfo->flags = v->flags;
1271         return 0;
1272 }
1273 EXPORT_SYMBOL_GPL(br_vlan_get_info);
1274
1275 static int br_vlan_is_bind_vlan_dev(const struct net_device *dev)
1276 {
1277         return is_vlan_dev(dev) &&
1278                 !!(vlan_dev_priv(dev)->flags & VLAN_FLAG_BRIDGE_BINDING);
1279 }
1280
1281 static int br_vlan_is_bind_vlan_dev_fn(struct net_device *dev,
1282                                        __always_unused void *data)
1283 {
1284         return br_vlan_is_bind_vlan_dev(dev);
1285 }
1286
1287 static bool br_vlan_has_upper_bind_vlan_dev(struct net_device *dev)
1288 {
1289         int found;
1290
1291         rcu_read_lock();
1292         found = netdev_walk_all_upper_dev_rcu(dev, br_vlan_is_bind_vlan_dev_fn,
1293                                               NULL);
1294         rcu_read_unlock();
1295
1296         return !!found;
1297 }
1298
1299 struct br_vlan_bind_walk_data {
1300         u16 vid;
1301         struct net_device *result;
1302 };
1303
1304 static int br_vlan_match_bind_vlan_dev_fn(struct net_device *dev,
1305                                           void *data_in)
1306 {
1307         struct br_vlan_bind_walk_data *data = data_in;
1308         int found = 0;
1309
1310         if (br_vlan_is_bind_vlan_dev(dev) &&
1311             vlan_dev_priv(dev)->vlan_id == data->vid) {
1312                 data->result = dev;
1313                 found = 1;
1314         }
1315
1316         return found;
1317 }
1318
1319 static struct net_device *
1320 br_vlan_get_upper_bind_vlan_dev(struct net_device *dev, u16 vid)
1321 {
1322         struct br_vlan_bind_walk_data data = {
1323                 .vid = vid,
1324         };
1325
1326         rcu_read_lock();
1327         netdev_walk_all_upper_dev_rcu(dev, br_vlan_match_bind_vlan_dev_fn,
1328                                       &data);
1329         rcu_read_unlock();
1330
1331         return data.result;
1332 }
1333
1334 static bool br_vlan_is_dev_up(const struct net_device *dev)
1335 {
1336         return  !!(dev->flags & IFF_UP) && netif_oper_up(dev);
1337 }
1338
1339 static void br_vlan_set_vlan_dev_state(const struct net_bridge *br,
1340                                        struct net_device *vlan_dev)
1341 {
1342         u16 vid = vlan_dev_priv(vlan_dev)->vlan_id;
1343         struct net_bridge_vlan_group *vg;
1344         struct net_bridge_port *p;
1345         bool has_carrier = false;
1346
1347         if (!netif_carrier_ok(br->dev)) {
1348                 netif_carrier_off(vlan_dev);
1349                 return;
1350         }
1351
1352         list_for_each_entry(p, &br->port_list, list) {
1353                 vg = nbp_vlan_group(p);
1354                 if (br_vlan_find(vg, vid) && br_vlan_is_dev_up(p->dev)) {
1355                         has_carrier = true;
1356                         break;
1357                 }
1358         }
1359
1360         if (has_carrier)
1361                 netif_carrier_on(vlan_dev);
1362         else
1363                 netif_carrier_off(vlan_dev);
1364 }
1365
1366 static void br_vlan_set_all_vlan_dev_state(struct net_bridge_port *p)
1367 {
1368         struct net_bridge_vlan_group *vg = nbp_vlan_group(p);
1369         struct net_bridge_vlan *vlan;
1370         struct net_device *vlan_dev;
1371
1372         list_for_each_entry(vlan, &vg->vlan_list, vlist) {
1373                 vlan_dev = br_vlan_get_upper_bind_vlan_dev(p->br->dev,
1374                                                            vlan->vid);
1375                 if (vlan_dev) {
1376                         if (br_vlan_is_dev_up(p->dev)) {
1377                                 if (netif_carrier_ok(p->br->dev))
1378                                         netif_carrier_on(vlan_dev);
1379                         } else {
1380                                 br_vlan_set_vlan_dev_state(p->br, vlan_dev);
1381                         }
1382                 }
1383         }
1384 }
1385
1386 static void br_vlan_upper_change(struct net_device *dev,
1387                                  struct net_device *upper_dev,
1388                                  bool linking)
1389 {
1390         struct net_bridge *br = netdev_priv(dev);
1391
1392         if (!br_vlan_is_bind_vlan_dev(upper_dev))
1393                 return;
1394
1395         if (linking) {
1396                 br_vlan_set_vlan_dev_state(br, upper_dev);
1397                 br_opt_toggle(br, BROPT_VLAN_BRIDGE_BINDING, true);
1398         } else {
1399                 br_opt_toggle(br, BROPT_VLAN_BRIDGE_BINDING,
1400                               br_vlan_has_upper_bind_vlan_dev(dev));
1401         }
1402 }
1403
1404 struct br_vlan_link_state_walk_data {
1405         struct net_bridge *br;
1406 };
1407
1408 static int br_vlan_link_state_change_fn(struct net_device *vlan_dev,
1409                                         void *data_in)
1410 {
1411         struct br_vlan_link_state_walk_data *data = data_in;
1412
1413         if (br_vlan_is_bind_vlan_dev(vlan_dev))
1414                 br_vlan_set_vlan_dev_state(data->br, vlan_dev);
1415
1416         return 0;
1417 }
1418
1419 static void br_vlan_link_state_change(struct net_device *dev,
1420                                       struct net_bridge *br)
1421 {
1422         struct br_vlan_link_state_walk_data data = {
1423                 .br = br
1424         };
1425
1426         rcu_read_lock();
1427         netdev_walk_all_upper_dev_rcu(dev, br_vlan_link_state_change_fn,
1428                                       &data);
1429         rcu_read_unlock();
1430 }
1431
1432 /* Must be protected by RTNL. */
1433 static void nbp_vlan_set_vlan_dev_state(struct net_bridge_port *p, u16 vid)
1434 {
1435         struct net_device *vlan_dev;
1436
1437         if (!br_opt_get(p->br, BROPT_VLAN_BRIDGE_BINDING))
1438                 return;
1439
1440         vlan_dev = br_vlan_get_upper_bind_vlan_dev(p->br->dev, vid);
1441         if (vlan_dev)
1442                 br_vlan_set_vlan_dev_state(p->br, vlan_dev);
1443 }
1444
1445 /* Must be protected by RTNL. */
1446 void br_vlan_bridge_event(struct net_device *dev, unsigned long event,
1447                           void *ptr)
1448 {
1449         struct netdev_notifier_changeupper_info *info;
1450         struct net_bridge *br;
1451
1452         switch (event) {
1453         case NETDEV_CHANGEUPPER:
1454                 info = ptr;
1455                 br_vlan_upper_change(dev, info->upper_dev, info->linking);
1456                 break;
1457
1458         case NETDEV_CHANGE:
1459         case NETDEV_UP:
1460                 br = netdev_priv(dev);
1461                 if (!br_opt_get(br, BROPT_VLAN_BRIDGE_BINDING))
1462                         return;
1463                 br_vlan_link_state_change(dev, br);
1464                 break;
1465         }
1466 }
1467
1468 /* Must be protected by RTNL. */
1469 void br_vlan_port_event(struct net_bridge_port *p, unsigned long event)
1470 {
1471         if (!br_opt_get(p->br, BROPT_VLAN_BRIDGE_BINDING))
1472                 return;
1473
1474         switch (event) {
1475         case NETDEV_CHANGE:
1476         case NETDEV_DOWN:
1477         case NETDEV_UP:
1478                 br_vlan_set_all_vlan_dev_state(p);
1479                 break;
1480         }
1481 }