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,
  38                             const struct net_bridge_vlan *v)
  39 {
  40         if (vg->pvid == v->vid)
  41                 return false;
  42
  43         smp_wmb();
  44         br_vlan_set_pvid_state(vg, v->state);
  45         vg->pvid = v->vid;
  46
  47         return true;
  48 }
  49
  50 static bool __vlan_delete_pvid(struct net_bridge_vlan_group *vg, u16 vid)
  51 {
  52         if (vg->pvid != vid)
  53                 return false;
  54
  55         smp_wmb();
  56         vg->pvid = 0;
  57
  58         return true;
  59 }
  60
  61 /* return true if anything changed, false otherwise */
  62 static bool __vlan_add_flags(struct net_bridge_vlan *v, u16 flags)
  63 {
  64         struct net_bridge_vlan_group *vg;
  65         u16 old_flags = v->flags;
  66         bool ret;
  67
  68         if (br_vlan_is_master(v))
  69                 vg = br_vlan_group(v->br);
  70         else
  71                 vg = nbp_vlan_group(v->port);
  72
  73         if (flags & BRIDGE_VLAN_INFO_PVID)
  74                 ret = __vlan_add_pvid(vg, v);
  75         else
  76                 ret = __vlan_delete_pvid(vg, v->vid);
  77
  78         if (flags & BRIDGE_VLAN_INFO_UNTAGGED)
  79                 v->flags |= BRIDGE_VLAN_INFO_UNTAGGED;
  80         else
  81                 v->flags &= ~BRIDGE_VLAN_INFO_UNTAGGED;
  82
  83         return ret || !!(old_flags ^ v->flags);
  84 }
  85
  86 static int __vlan_vid_add(struct net_device *dev, struct net_bridge *br,
  87                           struct net_bridge_vlan *v, u16 flags,
  88                           struct netlink_ext_ack *extack)
  89 {
  90         int err;
  91
  92         /* Try switchdev op first. In case it is not supported, fallback to
  93          * 8021q add.
  94          */
  95         err = br_switchdev_port_vlan_add(dev, v->vid, flags, extack);
  96         if (err == -EOPNOTSUPP)
  97                 return vlan_vid_add(dev, br->vlan_proto, v->vid);
  98         v->priv_flags |= BR_VLFLAG_ADDED_BY_SWITCHDEV;
  99         return err;
 100 }
 101
 102 static void __vlan_add_list(struct net_bridge_vlan *v)
 103 {
 104         struct net_bridge_vlan_group *vg;
 105         struct list_head *headp, *hpos;
 106         struct net_bridge_vlan *vent;
 107
 108         if (br_vlan_is_master(v))
 109                 vg = br_vlan_group(v->br);
 110         else
 111                 vg = nbp_vlan_group(v->port);
 112
 113         headp = &vg->vlan_list;
 114         list_for_each_prev(hpos, headp) {
 115                 vent = list_entry(hpos, struct net_bridge_vlan, vlist);
 116                 if (v->vid >= vent->vid)
 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
 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                 br_multicast_toggle_one_vlan(masterv, false);
 194                 br_multicast_ctx_deinit(&masterv->br_mcast_ctx);
 195                 call_rcu(&masterv->rcu, br_master_vlan_rcu_free);
 196         }
 197 }
 198
 199 static void nbp_vlan_rcu_free(struct rcu_head *rcu)
 200 {
 201         struct net_bridge_vlan *v;
 202
 203         v = container_of(rcu, struct net_bridge_vlan, rcu);
 204         WARN_ON(br_vlan_is_master(v));
 205         /* if we had per-port stats configured then free them here */
 206         if (v->priv_flags & BR_VLFLAG_PER_PORT_STATS)
 207                 free_percpu(v->stats);
 208         v->stats = NULL;
 209         kfree(v);
 210 }
 211
 212 /* This is the shared VLAN add function which works for both ports and bridge
 213  * devices. There are four possible calls to this function in terms of the
 214  * vlan entry type:
 215  * 1. vlan is being added on a port (no master flags, global entry exists)
 216  * 2. vlan is being added on a bridge (both master and brentry flags)
 217  * 3. vlan is being added on a port, but a global entry didn't exist which
 218  *    is being created right now (master flag set, brentry flag unset), the
 219  *    global entry is used for global per-vlan features, but not for filtering
 220  * 4. same as 3 but with both master and brentry flags set so the entry
 221  *    will be used for filtering in both the port and the bridge
 222  */
 223 static int __vlan_add(struct net_bridge_vlan *v, u16 flags,
 224                       struct netlink_ext_ack *extack)
 225 {
 226         struct net_bridge_vlan *masterv = NULL;
 227         struct net_bridge_port *p = NULL;
 228         struct net_bridge_vlan_group *vg;
 229         struct net_device *dev;
 230         struct net_bridge *br;
 231         int err;
 232
 233         if (br_vlan_is_master(v)) {
 234                 br = v->br;
 235                 dev = br->dev;
 236                 vg = br_vlan_group(br);
 237         } else {
 238                 p = v->port;
 239                 br = p->br;
 240                 dev = p->dev;
 241                 vg = nbp_vlan_group(p);
 242         }
 243
 244         if (p) {
 245                 /* Add VLAN to the device filter if it is supported.
 246                  * This ensures tagged traffic enters the bridge when
 247                  * promiscuous mode is disabled by br_manage_promisc().
 248                  */
 249                 err = __vlan_vid_add(dev, br, v, flags, extack);
 250                 if (err)
 251                         goto out;
 252
 253                 /* need to work on the master vlan too */
 254                 if (flags & BRIDGE_VLAN_INFO_MASTER) {
 255                         bool changed;
 256
 257                         err = br_vlan_add(br, v->vid,
 258                                           flags | BRIDGE_VLAN_INFO_BRENTRY,
 259                                           &changed, extack);
 260                         if (err)
 261                                 goto out_filt;
 262
 263                         if (changed)
 264                                 br_vlan_notify(br, NULL, v->vid, 0,
 265                                                RTM_NEWVLAN);
 266                 }
 267
 268                 masterv = br_vlan_get_master(br, v->vid, extack);
 269                 if (!masterv) {
 270                         err = -ENOMEM;
 271                         goto out_filt;
 272                 }
 273                 v->brvlan = masterv;
 274                 if (br_opt_get(br, BROPT_VLAN_STATS_PER_PORT)) {
 275                         v->stats =
 276                              netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
 277                         if (!v->stats) {
 278                                 err = -ENOMEM;
 279                                 goto out_filt;
 280                         }
 281                         v->priv_flags |= BR_VLFLAG_PER_PORT_STATS;
 282                 } else {
 283                         v->stats = masterv->stats;
 284                 }
 285                 br_multicast_port_ctx_init(p, v, &v->port_mcast_ctx);
 286         } else {
 287                 err = br_switchdev_port_vlan_add(dev, v->vid, flags, extack);
 288                 if (err && err != -EOPNOTSUPP)
 289                         goto out;
 290                 br_multicast_ctx_init(br, v, &v->br_mcast_ctx);
 291                 v->priv_flags |= BR_VLFLAG_GLOBAL_MCAST_ENABLED;
 292         }
 293
 294         /* Add the dev mac and count the vlan only if it's usable */
 295         if (br_vlan_should_use(v)) {
 296                 err = br_fdb_add_local(br, p, dev->dev_addr, v->vid);
 297                 if (err) {
 298                         br_err(br, "failed insert local address into bridge forwarding table\n");
 299                         goto out_filt;
 300                 }
 301                 vg->num_vlans++;
 302         }
 303
 304         /* set the state before publishing */
 305         v->state = BR_STATE_FORWARDING;
 306
 307         err = rhashtable_lookup_insert_fast(&vg->vlan_hash, &v->vnode,
 308                                             br_vlan_rht_params);
 309         if (err)
 310                 goto out_fdb_insert;
 311
 312         __vlan_add_list(v);
 313         __vlan_add_flags(v, flags);
 314         br_multicast_toggle_one_vlan(v, true);
 315
 316         if (p)
 317                 nbp_vlan_set_vlan_dev_state(p, v->vid);
 318 out:
 319         return err;
 320
 321 out_fdb_insert:
 322         if (br_vlan_should_use(v)) {
 323                 br_fdb_find_delete_local(br, p, dev->dev_addr, v->vid);
 324                 vg->num_vlans--;
 325         }
 326
 327 out_filt:
 328         if (p) {
 329                 __vlan_vid_del(dev, br, v);
 330                 if (masterv) {
 331                         if (v->stats && masterv->stats != v->stats)
 332                                 free_percpu(v->stats);
 333                         v->stats = NULL;
 334
 335                         br_vlan_put_master(masterv);
 336                         v->brvlan = NULL;
 337                 }
 338         } else {
 339                 br_switchdev_port_vlan_del(dev, v->vid);
 340         }
 341
 342         goto out;
 343 }
 344
 345 static int __vlan_del(struct net_bridge_vlan *v)
 346 {
 347         struct net_bridge_vlan *masterv = v;
 348         struct net_bridge_vlan_group *vg;
 349         struct net_bridge_port *p = NULL;
 350         int err = 0;
 351
 352         if (br_vlan_is_master(v)) {
 353                 vg = br_vlan_group(v->br);
 354         } else {
 355                 p = v->port;
 356                 vg = nbp_vlan_group(v->port);
 357                 masterv = v->brvlan;
 358         }
 359
 360         __vlan_delete_pvid(vg, v->vid);
 361         if (p) {
 362                 err = __vlan_vid_del(p->dev, p->br, v);
 363                 if (err)
 364                         goto out;
 365         } else {
 366                 err = br_switchdev_port_vlan_del(v->br->dev, v->vid);
 367                 if (err && err != -EOPNOTSUPP)
 368                         goto out;
 369                 err = 0;
 370         }
 371
 372         if (br_vlan_should_use(v)) {
 373                 v->flags &= ~BRIDGE_VLAN_INFO_BRENTRY;
 374                 vg->num_vlans--;
 375         }
 376
 377         if (masterv != v) {
 378                 vlan_tunnel_info_del(vg, v);
 379                 rhashtable_remove_fast(&vg->vlan_hash, &v->vnode,
 380                                        br_vlan_rht_params);
 381                 __vlan_del_list(v);
 382                 nbp_vlan_set_vlan_dev_state(p, v->vid);
 383                 br_multicast_toggle_one_vlan(v, false);
 384                 br_multicast_port_ctx_deinit(&v->port_mcast_ctx);
 385                 call_rcu(&v->rcu, nbp_vlan_rcu_free);
 386         }
 387
 388         br_vlan_put_master(masterv);
 389 out:
 390         return err;
 391 }
 392
 393 static void __vlan_group_free(struct net_bridge_vlan_group *vg)
 394 {
 395         WARN_ON(!list_empty(&vg->vlan_list));
 396         rhashtable_destroy(&vg->vlan_hash);
 397         vlan_tunnel_deinit(vg);
 398         kfree(vg);
 399 }
 400
 401 static void __vlan_flush(const struct net_bridge *br,
 402                          const struct net_bridge_port *p,
 403                          struct net_bridge_vlan_group *vg)
 404 {
 405         struct net_bridge_vlan *vlan, *tmp;
 406         u16 v_start = 0, v_end = 0;
 407
 408         __vlan_delete_pvid(vg, vg->pvid);
 409         list_for_each_entry_safe(vlan, tmp, &vg->vlan_list, vlist) {
 410                 /* take care of disjoint ranges */
 411                 if (!v_start) {
 412                         v_start = vlan->vid;
 413                 } else if (vlan->vid - v_end != 1) {
 414                         /* found range end, notify and start next one */
 415                         br_vlan_notify(br, p, v_start, v_end, RTM_DELVLAN);
 416                         v_start = vlan->vid;
 417                 }
 418                 v_end = vlan->vid;
 419
 420                 __vlan_del(vlan);
 421         }
 422
 423         /* notify about the last/whole vlan range */
 424         if (v_start)
 425                 br_vlan_notify(br, p, v_start, v_end, RTM_DELVLAN);
 426 }
 427
 428 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 429                                const struct net_bridge_port *p,
 430                                struct net_bridge_vlan_group *vg,
 431                                struct sk_buff *skb)
 432 {
 433         struct pcpu_sw_netstats *stats;
 434         struct net_bridge_vlan *v;
 435         u16 vid;
 436
 437         /* If this packet was not filtered at input, let it pass */
 438         if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
 439                 goto out;
 440
 441         /* At this point, we know that the frame was filtered and contains
 442          * a valid vlan id.  If the vlan id has untagged flag set,
 443          * send untagged; otherwise, send tagged.
 444          */
 445         br_vlan_get_tag(skb, &vid);
 446         v = br_vlan_find(vg, vid);
 447         /* Vlan entry must be configured at this point.  The
 448          * only exception is the bridge is set in promisc mode and the
 449          * packet is destined for the bridge device.  In this case
 450          * pass the packet as is.
 451          */
 452         if (!v || !br_vlan_should_use(v)) {
 453                 if ((br->dev->flags & IFF_PROMISC) && skb->dev == br->dev) {
 454                         goto out;
 455                 } else {
 456                         kfree_skb(skb);
 457                         return NULL;
 458                 }
 459         }
 460         if (br_opt_get(br, BROPT_VLAN_STATS_ENABLED)) {
 461                 stats = this_cpu_ptr(v->stats);
 462                 u64_stats_update_begin(&stats->syncp);
 463                 stats->tx_bytes += skb->len;
 464                 stats->tx_packets++;
 465                 u64_stats_update_end(&stats->syncp);
 466         }
 467
 468         /* If the skb will be sent using forwarding offload, the assumption is
 469          * that the switchdev will inject the packet into hardware together
 470          * with the bridge VLAN, so that it can be forwarded according to that
 471          * VLAN. The switchdev should deal with popping the VLAN header in
 472          * hardware on each egress port as appropriate. So only strip the VLAN
 473          * header if forwarding offload is not being used.
 474          */
 475         if (v->flags & BRIDGE_VLAN_INFO_UNTAGGED &&
 476             !br_switchdev_frame_uses_tx_fwd_offload(skb))
 477                 __vlan_hwaccel_clear_tag(skb);
 478
 479         if (p && (p->flags & BR_VLAN_TUNNEL) &&
 480             br_handle_egress_vlan_tunnel(skb, v)) {
 481                 kfree_skb(skb);
 482                 return NULL;
 483         }
 484 out:
 485         return skb;
 486 }
 487
 488 /* Called under RCU */
 489 static bool __allowed_ingress(const struct net_bridge *br,
 490                               struct net_bridge_vlan_group *vg,
 491                               struct sk_buff *skb, u16 *vid,
 492                               u8 *state,
 493                               struct net_bridge_vlan **vlan)
 494 {
 495         struct pcpu_sw_netstats *stats;
 496         struct net_bridge_vlan *v;
 497         bool tagged;
 498
 499         BR_INPUT_SKB_CB(skb)->vlan_filtered = true;
 500         /* If vlan tx offload is disabled on bridge device and frame was
 501          * sent from vlan device on the bridge device, it does not have
 502          * HW accelerated vlan tag.
 503          */
 504         if (unlikely(!skb_vlan_tag_present(skb) &&
 505                      skb->protocol == br->vlan_proto)) {
 506                 skb = skb_vlan_untag(skb);
 507                 if (unlikely(!skb))
 508                         return false;
 509         }
 510
 511         if (!br_vlan_get_tag(skb, vid)) {
 512                 /* Tagged frame */
 513                 if (skb->vlan_proto != br->vlan_proto) {
 514                         /* Protocol-mismatch, empty out vlan_tci for new tag */
 515                         skb_push(skb, ETH_HLEN);
 516                         skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto,
 517                                                         skb_vlan_tag_get(skb));
 518                         if (unlikely(!skb))
 519                                 return false;
 520
 521                         skb_pull(skb, ETH_HLEN);
 522                         skb_reset_mac_len(skb);
 523                         *vid = 0;
 524                         tagged = false;
 525                 } else {
 526                         tagged = true;
 527                 }
 528         } else {
 529                 /* Untagged frame */
 530                 tagged = false;
 531         }
 532
 533         if (!*vid) {
 534                 u16 pvid = br_get_pvid(vg);
 535
 536                 /* Frame had a tag with VID 0 or did not have a tag.
 537                  * See if pvid is set on this port.  That tells us which
 538                  * vlan untagged or priority-tagged traffic belongs to.
 539                  */
 540                 if (!pvid)
 541                         goto drop;
 542
 543                 /* PVID is set on this port.  Any untagged or priority-tagged
 544                  * ingress frame is considered to belong to this vlan.
 545                  */
 546                 *vid = pvid;
 547                 if (likely(!tagged))
 548                         /* Untagged Frame. */
 549                         __vlan_hwaccel_put_tag(skb, br->vlan_proto, pvid);
 550                 else
 551                         /* Priority-tagged Frame.
 552                          * At this point, we know that skb->vlan_tci VID
 553                          * field was 0.
 554                          * We update only VID field and preserve PCP field.
 555                          */
 556                         skb->vlan_tci |= pvid;
 557
 558                 /* if snooping and stats are disabled we can avoid the lookup */
 559                 if (!br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED) &&
 560                     !br_opt_get(br, BROPT_VLAN_STATS_ENABLED)) {
 561                         if (*state == BR_STATE_FORWARDING) {
 562                                 *state = br_vlan_get_pvid_state(vg);
 563                                 if (!br_vlan_state_allowed(*state, true))
 564                                         goto drop;
 565                         }
 566                         return true;
 567                 }
 568         }
 569         v = br_vlan_find(vg, *vid);
 570         if (!v || !br_vlan_should_use(v))
 571                 goto drop;
 572
 573         if (*state == BR_STATE_FORWARDING) {
 574                 *state = br_vlan_get_state(v);
 575                 if (!br_vlan_state_allowed(*state, true))
 576                         goto drop;
 577         }
 578
 579         if (br_opt_get(br, BROPT_VLAN_STATS_ENABLED)) {
 580                 stats = this_cpu_ptr(v->stats);
 581                 u64_stats_update_begin(&stats->syncp);
 582                 stats->rx_bytes += skb->len;
 583                 stats->rx_packets++;
 584                 u64_stats_update_end(&stats->syncp);
 585         }
 586
 587         *vlan = v;
 588
 589         return true;
 590
 591 drop:
 592         kfree_skb(skb);
 593         return false;
 594 }
 595
 596 bool br_allowed_ingress(const struct net_bridge *br,
 597                         struct net_bridge_vlan_group *vg, struct sk_buff *skb,
 598                         u16 *vid, u8 *state,
 599                         struct net_bridge_vlan **vlan)
 600 {
 601         /* If VLAN filtering is disabled on the bridge, all packets are
 602          * permitted.
 603          */
 604         *vlan = NULL;
 605         if (!br_opt_get(br, BROPT_VLAN_ENABLED)) {
 606                 BR_INPUT_SKB_CB(skb)->vlan_filtered = false;
 607                 return true;
 608         }
 609
 610         return __allowed_ingress(br, vg, skb, vid, state, vlan);
 611 }
 612
 613 /* Called under RCU. */
 614 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 615                        const struct sk_buff *skb)
 616 {
 617         const struct net_bridge_vlan *v;
 618         u16 vid;
 619
 620         /* If this packet was not filtered at input, let it pass */
 621         if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
 622                 return true;
 623
 624         br_vlan_get_tag(skb, &vid);
 625         v = br_vlan_find(vg, vid);
 626         if (v && br_vlan_should_use(v) &&
 627             br_vlan_state_allowed(br_vlan_get_state(v), false))
 628                 return true;
 629
 630         return false;
 631 }
 632
 633 /* Called under RCU */
 634 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid)
 635 {
 636         struct net_bridge_vlan_group *vg;
 637         struct net_bridge *br = p->br;
 638         struct net_bridge_vlan *v;
 639
 640         /* If filtering was disabled at input, let it pass. */
 641         if (!br_opt_get(br, BROPT_VLAN_ENABLED))
 642                 return true;
 643
 644         vg = nbp_vlan_group_rcu(p);
 645         if (!vg || !vg->num_vlans)
 646                 return false;
 647
 648         if (!br_vlan_get_tag(skb, vid) && skb->vlan_proto != br->vlan_proto)
 649                 *vid = 0;
 650
 651         if (!*vid) {
 652                 *vid = br_get_pvid(vg);
 653                 if (!*vid ||
 654                     !br_vlan_state_allowed(br_vlan_get_pvid_state(vg), true))
 655                         return false;
 656
 657                 return true;
 658         }
 659
 660         v = br_vlan_find(vg, *vid);
 661         if (v && br_vlan_state_allowed(br_vlan_get_state(v), true))
 662                 return true;
 663
 664         return false;
 665 }
 666
 667 static int br_vlan_add_existing(struct net_bridge *br,
 668                                 struct net_bridge_vlan_group *vg,
 669                                 struct net_bridge_vlan *vlan,
 670                                 u16 flags, bool *changed,
 671                                 struct netlink_ext_ack *extack)
 672 {
 673         int err;
 674
 675         err = br_switchdev_port_vlan_add(br->dev, vlan->vid, flags, extack);
 676         if (err && err != -EOPNOTSUPP)
 677                 return err;
 678
 679         if (!br_vlan_is_brentry(vlan)) {
 680                 /* Trying to change flags of non-existent bridge vlan */
 681                 if (!(flags & BRIDGE_VLAN_INFO_BRENTRY)) {
 682                         err = -EINVAL;
 683                         goto err_flags;
 684                 }
 685                 /* It was only kept for port vlans, now make it real */
 686                 err = br_fdb_add_local(br, NULL, br->dev->dev_addr, vlan->vid);
 687                 if (err) {
 688                         br_err(br, "failed to insert local address into bridge forwarding table\n");
 689                         goto err_fdb_insert;
 690                 }
 691
 692                 refcount_inc(&vlan->refcnt);
 693                 vlan->flags |= BRIDGE_VLAN_INFO_BRENTRY;
 694                 vg->num_vlans++;
 695                 *changed = true;
 696                 br_multicast_toggle_one_vlan(vlan, true);
 697         }
 698
 699         if (__vlan_add_flags(vlan, flags))
 700                 *changed = true;
 701
 702         return 0;
 703
 704 err_fdb_insert:
 705 err_flags:
 706         br_switchdev_port_vlan_del(br->dev, vlan->vid);
 707         return err;
 708 }
 709
 710 /* Must be protected by RTNL.
 711  * Must be called with vid in range from 1 to 4094 inclusive.
 712  * changed must be true only if the vlan was created or updated
 713  */
 714 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, bool *changed,
 715                 struct netlink_ext_ack *extack)
 716 {
 717         struct net_bridge_vlan_group *vg;
 718         struct net_bridge_vlan *vlan;
 719         int ret;
 720
 721         ASSERT_RTNL();
 722
 723         *changed = false;
 724         vg = br_vlan_group(br);
 725         vlan = br_vlan_find(vg, vid);
 726         if (vlan)
 727                 return br_vlan_add_existing(br, vg, vlan, flags, changed,
 728                                             extack);
 729
 730         vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
 731         if (!vlan)
 732                 return -ENOMEM;
 733
 734         vlan->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
 735         if (!vlan->stats) {
 736                 kfree(vlan);
 737                 return -ENOMEM;
 738         }
 739         vlan->vid = vid;
 740         vlan->flags = flags | BRIDGE_VLAN_INFO_MASTER;
 741         vlan->flags &= ~BRIDGE_VLAN_INFO_PVID;
 742         vlan->br = br;
 743         if (flags & BRIDGE_VLAN_INFO_BRENTRY)
 744                 refcount_set(&vlan->refcnt, 1);
 745         ret = __vlan_add(vlan, flags, extack);
 746         if (ret) {
 747                 free_percpu(vlan->stats);
 748                 kfree(vlan);
 749         } else {
 750                 *changed = true;
 751         }
 752
 753         return ret;
 754 }
 755
 756 /* Must be protected by RTNL.
 757  * Must be called with vid in range from 1 to 4094 inclusive.
 758  */
 759 int br_vlan_delete(struct net_bridge *br, u16 vid)
 760 {
 761         struct net_bridge_vlan_group *vg;
 762         struct net_bridge_vlan *v;
 763
 764         ASSERT_RTNL();
 765
 766         vg = br_vlan_group(br);
 767         v = br_vlan_find(vg, vid);
 768         if (!v || !br_vlan_is_brentry(v))
 769                 return -ENOENT;
 770
 771         br_fdb_find_delete_local(br, NULL, br->dev->dev_addr, vid);
 772         br_fdb_delete_by_port(br, NULL, vid, 0);
 773
 774         vlan_tunnel_info_del(vg, v);
 775
 776         return __vlan_del(v);
 777 }
 778
 779 void br_vlan_flush(struct net_bridge *br)
 780 {
 781         struct net_bridge_vlan_group *vg;
 782
 783         ASSERT_RTNL();
 784
 785         vg = br_vlan_group(br);
 786         __vlan_flush(br, NULL, vg);
 787         RCU_INIT_POINTER(br->vlgrp, NULL);
 788         synchronize_rcu();
 789         __vlan_group_free(vg);
 790 }
 791
 792 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid)
 793 {
 794         if (!vg)
 795                 return NULL;
 796
 797         return br_vlan_lookup(&vg->vlan_hash, vid);
 798 }
 799
 800 /* Must be protected by RTNL. */
 801 static void recalculate_group_addr(struct net_bridge *br)
 802 {
 803         if (br_opt_get(br, BROPT_GROUP_ADDR_SET))
 804                 return;
 805
 806         spin_lock_bh(&br->lock);
 807         if (!br_opt_get(br, BROPT_VLAN_ENABLED) ||
 808             br->vlan_proto == htons(ETH_P_8021Q)) {
 809                 /* Bridge Group Address */
 810                 br->group_addr[5] = 0x00;
 811         } else { /* vlan_enabled && ETH_P_8021AD */
 812                 /* Provider Bridge Group Address */
 813                 br->group_addr[5] = 0x08;
 814         }
 815         spin_unlock_bh(&br->lock);
 816 }
 817
 818 /* Must be protected by RTNL. */
 819 void br_recalculate_fwd_mask(struct net_bridge *br)
 820 {
 821         if (!br_opt_get(br, BROPT_VLAN_ENABLED) ||
 822             br->vlan_proto == htons(ETH_P_8021Q))
 823                 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
 824         else /* vlan_enabled && ETH_P_8021AD */
 825                 br->group_fwd_mask_required = BR_GROUPFWD_8021AD &
 826                                               ~(1u << br->group_addr[5]);
 827 }
 828
 829 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val,
 830                           struct netlink_ext_ack *extack)
 831 {
 832         struct switchdev_attr attr = {
 833                 .orig_dev = br->dev,
 834                 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
 835                 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
 836                 .u.vlan_filtering = val,
 837         };
 838         int err;
 839
 840         if (br_opt_get(br, BROPT_VLAN_ENABLED) == !!val)
 841                 return 0;
 842
 843         br_opt_toggle(br, BROPT_VLAN_ENABLED, !!val);
 844
 845         err = switchdev_port_attr_set(br->dev, &attr, extack);
 846         if (err && err != -EOPNOTSUPP) {
 847                 br_opt_toggle(br, BROPT_VLAN_ENABLED, !val);
 848                 return err;
 849         }
 850
 851         br_manage_promisc(br);
 852         recalculate_group_addr(br);
 853         br_recalculate_fwd_mask(br);
 854         if (!val && br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) {
 855                 br_info(br, "vlan filtering disabled, automatically disabling multicast vlan snooping\n");
 856                 br_multicast_toggle_vlan_snooping(br, false, NULL);
 857         }
 858
 859         return 0;
 860 }
 861
 862 bool br_vlan_enabled(const struct net_device *dev)
 863 {
 864         struct net_bridge *br = netdev_priv(dev);
 865
 866         return br_opt_get(br, BROPT_VLAN_ENABLED);
 867 }
 868 EXPORT_SYMBOL_GPL(br_vlan_enabled);
 869
 870 int br_vlan_get_proto(const struct net_device *dev, u16 *p_proto)
 871 {
 872         struct net_bridge *br = netdev_priv(dev);
 873
 874         *p_proto = ntohs(br->vlan_proto);
 875
 876         return 0;
 877 }
 878 EXPORT_SYMBOL_GPL(br_vlan_get_proto);
 879
 880 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto,
 881                         struct netlink_ext_ack *extack)
 882 {
 883         struct switchdev_attr attr = {
 884                 .orig_dev = br->dev,
 885                 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_PROTOCOL,
 886                 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
 887                 .u.vlan_protocol = ntohs(proto),
 888         };
 889         int err = 0;
 890         struct net_bridge_port *p;
 891         struct net_bridge_vlan *vlan;
 892         struct net_bridge_vlan_group *vg;
 893         __be16 oldproto = br->vlan_proto;
 894
 895         if (br->vlan_proto == proto)
 896                 return 0;
 897
 898         err = switchdev_port_attr_set(br->dev, &attr, extack);
 899         if (err && err != -EOPNOTSUPP)
 900                 return err;
 901
 902         /* Add VLANs for the new proto to the device filter. */
 903         list_for_each_entry(p, &br->port_list, list) {
 904                 vg = nbp_vlan_group(p);
 905                 list_for_each_entry(vlan, &vg->vlan_list, vlist) {
 906                         err = vlan_vid_add(p->dev, proto, vlan->vid);
 907                         if (err)
 908                                 goto err_filt;
 909                 }
 910         }
 911
 912         br->vlan_proto = proto;
 913
 914         recalculate_group_addr(br);
 915         br_recalculate_fwd_mask(br);
 916
 917         /* Delete VLANs for the old proto from the device filter. */
 918         list_for_each_entry(p, &br->port_list, list) {
 919                 vg = nbp_vlan_group(p);
 920                 list_for_each_entry(vlan, &vg->vlan_list, vlist)
 921                         vlan_vid_del(p->dev, oldproto, vlan->vid);
 922         }
 923
 924         return 0;
 925
 926 err_filt:
 927         attr.u.vlan_protocol = ntohs(oldproto);
 928         switchdev_port_attr_set(br->dev, &attr, NULL);
 929
 930         list_for_each_entry_continue_reverse(vlan, &vg->vlan_list, vlist)
 931                 vlan_vid_del(p->dev, proto, vlan->vid);
 932
 933         list_for_each_entry_continue_reverse(p, &br->port_list, list) {
 934                 vg = nbp_vlan_group(p);
 935                 list_for_each_entry(vlan, &vg->vlan_list, vlist)
 936                         vlan_vid_del(p->dev, proto, vlan->vid);
 937         }
 938
 939         return err;
 940 }
 941
 942 int br_vlan_set_proto(struct net_bridge *br, unsigned long val,
 943                       struct netlink_ext_ack *extack)
 944 {
 945         if (!eth_type_vlan(htons(val)))
 946                 return -EPROTONOSUPPORT;
 947
 948         return __br_vlan_set_proto(br, htons(val), extack);
 949 }
 950
 951 int br_vlan_set_stats(struct net_bridge *br, unsigned long val)
 952 {
 953         switch (val) {
 954         case 0:
 955         case 1:
 956                 br_opt_toggle(br, BROPT_VLAN_STATS_ENABLED, !!val);
 957                 break;
 958         default:
 959                 return -EINVAL;
 960         }
 961
 962         return 0;
 963 }
 964
 965 int br_vlan_set_stats_per_port(struct net_bridge *br, unsigned long val)
 966 {
 967         struct net_bridge_port *p;
 968
 969         /* allow to change the option if there are no port vlans configured */
 970         list_for_each_entry(p, &br->port_list, list) {
 971                 struct net_bridge_vlan_group *vg = nbp_vlan_group(p);
 972
 973                 if (vg->num_vlans)
 974                         return -EBUSY;
 975         }
 976
 977         switch (val) {
 978         case 0:
 979         case 1:
 980                 br_opt_toggle(br, BROPT_VLAN_STATS_PER_PORT, !!val);
 981                 break;
 982         default:
 983                 return -EINVAL;
 984         }
 985
 986         return 0;
 987 }
 988
 989 static bool vlan_default_pvid(struct net_bridge_vlan_group *vg, u16 vid)
 990 {
 991         struct net_bridge_vlan *v;
 992
 993         if (vid != vg->pvid)
 994                 return false;
 995
 996         v = br_vlan_lookup(&vg->vlan_hash, vid);
 997         if (v && br_vlan_should_use(v) &&
 998             (v->flags & BRIDGE_VLAN_INFO_UNTAGGED))
 999                 return true;
1000
1001         return false;
1002 }
1003
1004 static void br_vlan_disable_default_pvid(struct net_bridge *br)
1005 {
1006         struct net_bridge_port *p;
1007         u16 pvid = br->default_pvid;
1008
1009         /* Disable default_pvid on all ports where it is still
1010          * configured.
1011          */
1012         if (vlan_default_pvid(br_vlan_group(br), pvid)) {
1013                 if (!br_vlan_delete(br, pvid))
1014                         br_vlan_notify(br, NULL, pvid, 0, RTM_DELVLAN);
1015         }
1016
1017         list_for_each_entry(p, &br->port_list, list) {
1018                 if (vlan_default_pvid(nbp_vlan_group(p), pvid) &&
1019                     !nbp_vlan_delete(p, pvid))
1020                         br_vlan_notify(br, p, pvid, 0, RTM_DELVLAN);
1021         }
1022
1023         br->default_pvid = 0;
1024 }
1025
1026 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid,
1027                                struct netlink_ext_ack *extack)
1028 {
1029         const struct net_bridge_vlan *pvent;
1030         struct net_bridge_vlan_group *vg;
1031         struct net_bridge_port *p;
1032         unsigned long *changed;
1033         bool vlchange;
1034         u16 old_pvid;
1035         int err = 0;
1036
1037         if (!pvid) {
1038                 br_vlan_disable_default_pvid(br);
1039                 return 0;
1040         }
1041
1042         changed = bitmap_zalloc(BR_MAX_PORTS, GFP_KERNEL);
1043         if (!changed)
1044                 return -ENOMEM;
1045
1046         old_pvid = br->default_pvid;
1047
1048         /* Update default_pvid config only if we do not conflict with
1049          * user configuration.
1050          */
1051         vg = br_vlan_group(br);
1052         pvent = br_vlan_find(vg, pvid);
1053         if ((!old_pvid || vlan_default_pvid(vg, old_pvid)) &&
1054             (!pvent || !br_vlan_should_use(pvent))) {
1055                 err = br_vlan_add(br, pvid,
1056                                   BRIDGE_VLAN_INFO_PVID |
1057                                   BRIDGE_VLAN_INFO_UNTAGGED |
1058                                   BRIDGE_VLAN_INFO_BRENTRY,
1059                                   &vlchange, extack);
1060                 if (err)
1061                         goto out;
1062
1063                 if (br_vlan_delete(br, old_pvid))
1064                         br_vlan_notify(br, NULL, old_pvid, 0, RTM_DELVLAN);
1065                 br_vlan_notify(br, NULL, pvid, 0, RTM_NEWVLAN);
1066                 __set_bit(0, changed);
1067         }
1068
1069         list_for_each_entry(p, &br->port_list, list) {
1070                 /* Update default_pvid config only if we do not conflict with
1071                  * user configuration.
1072                  */
1073                 vg = nbp_vlan_group(p);
1074                 if ((old_pvid &&
1075                      !vlan_default_pvid(vg, old_pvid)) ||
1076                     br_vlan_find(vg, pvid))
1077                         continue;
1078
1079                 err = nbp_vlan_add(p, pvid,
1080                                    BRIDGE_VLAN_INFO_PVID |
1081                                    BRIDGE_VLAN_INFO_UNTAGGED,
1082                                    &vlchange, extack);
1083                 if (err)
1084                         goto err_port;
1085                 if (nbp_vlan_delete(p, old_pvid))
1086                         br_vlan_notify(br, p, old_pvid, 0, RTM_DELVLAN);
1087                 br_vlan_notify(p->br, p, pvid, 0, RTM_NEWVLAN);
1088                 __set_bit(p->port_no, changed);
1089         }
1090
1091         br->default_pvid = pvid;
1092
1093 out:
1094         bitmap_free(changed);
1095         return err;
1096
1097 err_port:
1098         list_for_each_entry_continue_reverse(p, &br->port_list, list) {
1099                 if (!test_bit(p->port_no, changed))
1100                         continue;
1101
1102                 if (old_pvid) {
1103                         nbp_vlan_add(p, old_pvid,
1104                                      BRIDGE_VLAN_INFO_PVID |
1105                                      BRIDGE_VLAN_INFO_UNTAGGED,
1106                                      &vlchange, NULL);
1107                         br_vlan_notify(p->br, p, old_pvid, 0, RTM_NEWVLAN);
1108                 }
1109                 nbp_vlan_delete(p, pvid);
1110                 br_vlan_notify(br, p, pvid, 0, RTM_DELVLAN);
1111         }
1112
1113         if (test_bit(0, changed)) {
1114                 if (old_pvid) {
1115                         br_vlan_add(br, old_pvid,
1116                                     BRIDGE_VLAN_INFO_PVID |
1117                                     BRIDGE_VLAN_INFO_UNTAGGED |
1118                                     BRIDGE_VLAN_INFO_BRENTRY,
1119                                     &vlchange, NULL);
1120                         br_vlan_notify(br, NULL, old_pvid, 0, RTM_NEWVLAN);
1121                 }
1122                 br_vlan_delete(br, pvid);
1123                 br_vlan_notify(br, NULL, pvid, 0, RTM_DELVLAN);
1124         }
1125         goto out;
1126 }
1127
1128 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val,
1129                              struct netlink_ext_ack *extack)
1130 {
1131         u16 pvid = val;
1132         int err = 0;
1133
1134         if (val >= VLAN_VID_MASK)
1135                 return -EINVAL;
1136
1137         if (pvid == br->default_pvid)
1138                 goto out;
1139
1140         /* Only allow default pvid change when filtering is disabled */
1141         if (br_opt_get(br, BROPT_VLAN_ENABLED)) {
1142                 pr_info_once("Please disable vlan filtering to change default_pvid\n");
1143                 err = -EPERM;
1144                 goto out;
1145         }
1146         err = __br_vlan_set_default_pvid(br, pvid, extack);
1147 out:
1148         return err;
1149 }
1150
1151 int br_vlan_init(struct net_bridge *br)
1152 {
1153         struct net_bridge_vlan_group *vg;
1154         int ret = -ENOMEM;
1155
1156         vg = kzalloc(sizeof(*vg), GFP_KERNEL);
1157         if (!vg)
1158                 goto out;
1159         ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params);
1160         if (ret)
1161                 goto err_rhtbl;
1162         ret = vlan_tunnel_init(vg);
1163         if (ret)
1164                 goto err_tunnel_init;
1165         INIT_LIST_HEAD(&vg->vlan_list);
1166         br->vlan_proto = htons(ETH_P_8021Q);
1167         br->default_pvid = 1;
1168         rcu_assign_pointer(br->vlgrp, vg);
1169
1170 out:
1171         return ret;
1172
1173 err_tunnel_init:
1174         rhashtable_destroy(&vg->vlan_hash);
1175 err_rhtbl:
1176         kfree(vg);
1177
1178         goto out;
1179 }
1180
1181 int nbp_vlan_init(struct net_bridge_port *p, struct netlink_ext_ack *extack)
1182 {
1183         struct switchdev_attr attr = {
1184                 .orig_dev = p->br->dev,
1185                 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
1186                 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
1187                 .u.vlan_filtering = br_opt_get(p->br, BROPT_VLAN_ENABLED),
1188         };
1189         struct net_bridge_vlan_group *vg;
1190         int ret = -ENOMEM;
1191
1192         vg = kzalloc(sizeof(struct net_bridge_vlan_group), GFP_KERNEL);
1193         if (!vg)
1194                 goto out;
1195
1196         ret = switchdev_port_attr_set(p->dev, &attr, extack);
1197         if (ret && ret != -EOPNOTSUPP)
1198                 goto err_vlan_enabled;
1199
1200         ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params);
1201         if (ret)
1202                 goto err_rhtbl;
1203         ret = vlan_tunnel_init(vg);
1204         if (ret)
1205                 goto err_tunnel_init;
1206         INIT_LIST_HEAD(&vg->vlan_list);
1207         rcu_assign_pointer(p->vlgrp, vg);
1208         if (p->br->default_pvid) {
1209                 bool changed;
1210
1211                 ret = nbp_vlan_add(p, p->br->default_pvid,
1212                                    BRIDGE_VLAN_INFO_PVID |
1213                                    BRIDGE_VLAN_INFO_UNTAGGED,
1214                                    &changed, extack);
1215                 if (ret)
1216                         goto err_vlan_add;
1217                 br_vlan_notify(p->br, p, p->br->default_pvid, 0, RTM_NEWVLAN);
1218         }
1219 out:
1220         return ret;
1221
1222 err_vlan_add:
1223         RCU_INIT_POINTER(p->vlgrp, NULL);
1224         synchronize_rcu();
1225         vlan_tunnel_deinit(vg);
1226 err_tunnel_init:
1227         rhashtable_destroy(&vg->vlan_hash);
1228 err_rhtbl:
1229 err_vlan_enabled:
1230         kfree(vg);
1231
1232         goto out;
1233 }
1234
1235 /* Must be protected by RTNL.
1236  * Must be called with vid in range from 1 to 4094 inclusive.
1237  * changed must be true only if the vlan was created or updated
1238  */
1239 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
1240                  bool *changed, struct netlink_ext_ack *extack)
1241 {
1242         struct net_bridge_vlan *vlan;
1243         int ret;
1244
1245         ASSERT_RTNL();
1246
1247         *changed = false;
1248         vlan = br_vlan_find(nbp_vlan_group(port), vid);
1249         if (vlan) {
1250                 /* Pass the flags to the hardware bridge */
1251                 ret = br_switchdev_port_vlan_add(port->dev, vid, flags, extack);
1252                 if (ret && ret != -EOPNOTSUPP)
1253                         return ret;
1254                 *changed = __vlan_add_flags(vlan, flags);
1255
1256                 return 0;
1257         }
1258
1259         vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
1260         if (!vlan)
1261                 return -ENOMEM;
1262
1263         vlan->vid = vid;
1264         vlan->port = port;
1265         ret = __vlan_add(vlan, flags, extack);
1266         if (ret)
1267                 kfree(vlan);
1268         else
1269                 *changed = true;
1270
1271         return ret;
1272 }
1273
1274 /* Must be protected by RTNL.
1275  * Must be called with vid in range from 1 to 4094 inclusive.
1276  */
1277 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
1278 {
1279         struct net_bridge_vlan *v;
1280
1281         ASSERT_RTNL();
1282
1283         v = br_vlan_find(nbp_vlan_group(port), vid);
1284         if (!v)
1285                 return -ENOENT;
1286         br_fdb_find_delete_local(port->br, port, port->dev->dev_addr, vid);
1287         br_fdb_delete_by_port(port->br, port, vid, 0);
1288
1289         return __vlan_del(v);
1290 }
1291
1292 void nbp_vlan_flush(struct net_bridge_port *port)
1293 {
1294         struct net_bridge_vlan_group *vg;
1295
1296         ASSERT_RTNL();
1297
1298         vg = nbp_vlan_group(port);
1299         __vlan_flush(port->br, port, vg);
1300         RCU_INIT_POINTER(port->vlgrp, NULL);
1301         synchronize_rcu();
1302         __vlan_group_free(vg);
1303 }
1304
1305 void br_vlan_get_stats(const struct net_bridge_vlan *v,
1306                        struct pcpu_sw_netstats *stats)
1307 {
1308         int i;
1309
1310         memset(stats, 0, sizeof(*stats));
1311         for_each_possible_cpu(i) {
1312                 u64 rxpackets, rxbytes, txpackets, txbytes;
1313                 struct pcpu_sw_netstats *cpu_stats;
1314                 unsigned int start;
1315
1316                 cpu_stats = per_cpu_ptr(v->stats, i);
1317                 do {
1318                         start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1319                         rxpackets = cpu_stats->rx_packets;
1320                         rxbytes = cpu_stats->rx_bytes;
1321                         txbytes = cpu_stats->tx_bytes;
1322                         txpackets = cpu_stats->tx_packets;
1323                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
1324
1325                 stats->rx_packets += rxpackets;
1326                 stats->rx_bytes += rxbytes;
1327                 stats->tx_bytes += txbytes;
1328                 stats->tx_packets += txpackets;
1329         }
1330 }
1331
1332 int br_vlan_get_pvid(const struct net_device *dev, u16 *p_pvid)
1333 {
1334         struct net_bridge_vlan_group *vg;
1335         struct net_bridge_port *p;
1336
1337         ASSERT_RTNL();
1338         p = br_port_get_check_rtnl(dev);
1339         if (p)
1340                 vg = nbp_vlan_group(p);
1341         else if (netif_is_bridge_master(dev))
1342                 vg = br_vlan_group(netdev_priv(dev));
1343         else
1344                 return -EINVAL;
1345
1346         *p_pvid = br_get_pvid(vg);
1347         return 0;
1348 }
1349 EXPORT_SYMBOL_GPL(br_vlan_get_pvid);
1350
1351 int br_vlan_get_pvid_rcu(const struct net_device *dev, u16 *p_pvid)
1352 {
1353         struct net_bridge_vlan_group *vg;
1354         struct net_bridge_port *p;
1355
1356         p = br_port_get_check_rcu(dev);
1357         if (p)
1358                 vg = nbp_vlan_group_rcu(p);
1359         else if (netif_is_bridge_master(dev))
1360                 vg = br_vlan_group_rcu(netdev_priv(dev));
1361         else
1362                 return -EINVAL;
1363
1364         *p_pvid = br_get_pvid(vg);
1365         return 0;
1366 }
1367 EXPORT_SYMBOL_GPL(br_vlan_get_pvid_rcu);
1368
1369 void br_vlan_fill_forward_path_pvid(struct net_bridge *br,
1370                                     struct net_device_path_ctx *ctx,
1371                                     struct net_device_path *path)
1372 {
1373         struct net_bridge_vlan_group *vg;
1374         int idx = ctx->num_vlans - 1;
1375         u16 vid;
1376
1377         path->bridge.vlan_mode = DEV_PATH_BR_VLAN_KEEP;
1378
1379         if (!br_opt_get(br, BROPT_VLAN_ENABLED))
1380                 return;
1381
1382         vg = br_vlan_group(br);
1383
1384         if (idx >= 0 &&
1385             ctx->vlan[idx].proto == br->vlan_proto) {
1386                 vid = ctx->vlan[idx].id;
1387         } else {
1388                 path->bridge.vlan_mode = DEV_PATH_BR_VLAN_TAG;
1389                 vid = br_get_pvid(vg);
1390         }
1391
1392         path->bridge.vlan_id = vid;
1393         path->bridge.vlan_proto = br->vlan_proto;
1394 }
1395
1396 int br_vlan_fill_forward_path_mode(struct net_bridge *br,
1397                                    struct net_bridge_port *dst,
1398                                    struct net_device_path *path)
1399 {
1400         struct net_bridge_vlan_group *vg;
1401         struct net_bridge_vlan *v;
1402
1403         if (!br_opt_get(br, BROPT_VLAN_ENABLED))
1404                 return 0;
1405
1406         vg = nbp_vlan_group_rcu(dst);
1407         v = br_vlan_find(vg, path->bridge.vlan_id);
1408         if (!v || !br_vlan_should_use(v))
1409                 return -EINVAL;
1410
1411         if (!(v->flags & BRIDGE_VLAN_INFO_UNTAGGED))
1412                 return 0;
1413
1414         if (path->bridge.vlan_mode == DEV_PATH_BR_VLAN_TAG)
1415                 path->bridge.vlan_mode = DEV_PATH_BR_VLAN_KEEP;
1416         else if (v->priv_flags & BR_VLFLAG_ADDED_BY_SWITCHDEV)
1417                 path->bridge.vlan_mode = DEV_PATH_BR_VLAN_UNTAG_HW;
1418         else
1419                 path->bridge.vlan_mode = DEV_PATH_BR_VLAN_UNTAG;
1420
1421         return 0;
1422 }
1423
1424 int br_vlan_get_info(const struct net_device *dev, u16 vid,
1425                      struct bridge_vlan_info *p_vinfo)
1426 {
1427         struct net_bridge_vlan_group *vg;
1428         struct net_bridge_vlan *v;
1429         struct net_bridge_port *p;
1430
1431         ASSERT_RTNL();
1432         p = br_port_get_check_rtnl(dev);
1433         if (p)
1434                 vg = nbp_vlan_group(p);
1435         else if (netif_is_bridge_master(dev))
1436                 vg = br_vlan_group(netdev_priv(dev));
1437         else
1438                 return -EINVAL;
1439
1440         v = br_vlan_find(vg, vid);
1441         if (!v)
1442                 return -ENOENT;
1443
1444         p_vinfo->vid = vid;
1445         p_vinfo->flags = v->flags;
1446         if (vid == br_get_pvid(vg))
1447                 p_vinfo->flags |= BRIDGE_VLAN_INFO_PVID;
1448         return 0;
1449 }
1450 EXPORT_SYMBOL_GPL(br_vlan_get_info);
1451
1452 int br_vlan_get_info_rcu(const struct net_device *dev, u16 vid,
1453                          struct bridge_vlan_info *p_vinfo)
1454 {
1455         struct net_bridge_vlan_group *vg;
1456         struct net_bridge_vlan *v;
1457         struct net_bridge_port *p;
1458
1459         p = br_port_get_check_rcu(dev);
1460         if (p)
1461                 vg = nbp_vlan_group_rcu(p);
1462         else if (netif_is_bridge_master(dev))
1463                 vg = br_vlan_group_rcu(netdev_priv(dev));
1464         else
1465                 return -EINVAL;
1466
1467         v = br_vlan_find(vg, vid);
1468         if (!v)
1469                 return -ENOENT;
1470
1471         p_vinfo->vid = vid;
1472         p_vinfo->flags = v->flags;
1473         if (vid == br_get_pvid(vg))
1474                 p_vinfo->flags |= BRIDGE_VLAN_INFO_PVID;
1475         return 0;
1476 }
1477 EXPORT_SYMBOL_GPL(br_vlan_get_info_rcu);
1478
1479 static int br_vlan_is_bind_vlan_dev(const struct net_device *dev)
1480 {
1481         return is_vlan_dev(dev) &&
1482                 !!(vlan_dev_priv(dev)->flags & VLAN_FLAG_BRIDGE_BINDING);
1483 }
1484
1485 static int br_vlan_is_bind_vlan_dev_fn(struct net_device *dev,
1486                                __always_unused struct netdev_nested_priv *priv)
1487 {
1488         return br_vlan_is_bind_vlan_dev(dev);
1489 }
1490
1491 static bool br_vlan_has_upper_bind_vlan_dev(struct net_device *dev)
1492 {
1493         int found;
1494
1495         rcu_read_lock();
1496         found = netdev_walk_all_upper_dev_rcu(dev, br_vlan_is_bind_vlan_dev_fn,
1497                                               NULL);
1498         rcu_read_unlock();
1499
1500         return !!found;
1501 }
1502
1503 struct br_vlan_bind_walk_data {
1504         u16 vid;
1505         struct net_device *result;
1506 };
1507
1508 static int br_vlan_match_bind_vlan_dev_fn(struct net_device *dev,
1509                                           struct netdev_nested_priv *priv)
1510 {
1511         struct br_vlan_bind_walk_data *data = priv->data;
1512         int found = 0;
1513
1514         if (br_vlan_is_bind_vlan_dev(dev) &&
1515             vlan_dev_priv(dev)->vlan_id == data->vid) {
1516                 data->result = dev;
1517                 found = 1;
1518         }
1519
1520         return found;
1521 }
1522
1523 static struct net_device *
1524 br_vlan_get_upper_bind_vlan_dev(struct net_device *dev, u16 vid)
1525 {
1526         struct br_vlan_bind_walk_data data = {
1527                 .vid = vid,
1528         };
1529         struct netdev_nested_priv priv = {
1530                 .data = (void *)&data,
1531         };
1532
1533         rcu_read_lock();
1534         netdev_walk_all_upper_dev_rcu(dev, br_vlan_match_bind_vlan_dev_fn,
1535                                       &priv);
1536         rcu_read_unlock();
1537
1538         return data.result;
1539 }
1540
1541 static bool br_vlan_is_dev_up(const struct net_device *dev)
1542 {
1543         return  !!(dev->flags & IFF_UP) && netif_oper_up(dev);
1544 }
1545
1546 static void br_vlan_set_vlan_dev_state(const struct net_bridge *br,
1547                                        struct net_device *vlan_dev)
1548 {
1549         u16 vid = vlan_dev_priv(vlan_dev)->vlan_id;
1550         struct net_bridge_vlan_group *vg;
1551         struct net_bridge_port *p;
1552         bool has_carrier = false;
1553
1554         if (!netif_carrier_ok(br->dev)) {
1555                 netif_carrier_off(vlan_dev);
1556                 return;
1557         }
1558
1559         list_for_each_entry(p, &br->port_list, list) {
1560                 vg = nbp_vlan_group(p);
1561                 if (br_vlan_find(vg, vid) && br_vlan_is_dev_up(p->dev)) {
1562                         has_carrier = true;
1563                         break;
1564                 }
1565         }
1566
1567         if (has_carrier)
1568                 netif_carrier_on(vlan_dev);
1569         else
1570                 netif_carrier_off(vlan_dev);
1571 }
1572
1573 static void br_vlan_set_all_vlan_dev_state(struct net_bridge_port *p)
1574 {
1575         struct net_bridge_vlan_group *vg = nbp_vlan_group(p);
1576         struct net_bridge_vlan *vlan;
1577         struct net_device *vlan_dev;
1578
1579         list_for_each_entry(vlan, &vg->vlan_list, vlist) {
1580                 vlan_dev = br_vlan_get_upper_bind_vlan_dev(p->br->dev,
1581                                                            vlan->vid);
1582                 if (vlan_dev) {
1583                         if (br_vlan_is_dev_up(p->dev)) {
1584                                 if (netif_carrier_ok(p->br->dev))
1585                                         netif_carrier_on(vlan_dev);
1586                         } else {
1587                                 br_vlan_set_vlan_dev_state(p->br, vlan_dev);
1588                         }
1589                 }
1590         }
1591 }
1592
1593 static void br_vlan_upper_change(struct net_device *dev,
1594                                  struct net_device *upper_dev,
1595                                  bool linking)
1596 {
1597         struct net_bridge *br = netdev_priv(dev);
1598
1599         if (!br_vlan_is_bind_vlan_dev(upper_dev))
1600                 return;
1601
1602         if (linking) {
1603                 br_vlan_set_vlan_dev_state(br, upper_dev);
1604                 br_opt_toggle(br, BROPT_VLAN_BRIDGE_BINDING, true);
1605         } else {
1606                 br_opt_toggle(br, BROPT_VLAN_BRIDGE_BINDING,
1607                               br_vlan_has_upper_bind_vlan_dev(dev));
1608         }
1609 }
1610
1611 struct br_vlan_link_state_walk_data {
1612         struct net_bridge *br;
1613 };
1614
1615 static int br_vlan_link_state_change_fn(struct net_device *vlan_dev,
1616                                         struct netdev_nested_priv *priv)
1617 {
1618         struct br_vlan_link_state_walk_data *data = priv->data;
1619
1620         if (br_vlan_is_bind_vlan_dev(vlan_dev))
1621                 br_vlan_set_vlan_dev_state(data->br, vlan_dev);
1622
1623         return 0;
1624 }
1625
1626 static void br_vlan_link_state_change(struct net_device *dev,
1627                                       struct net_bridge *br)
1628 {
1629         struct br_vlan_link_state_walk_data data = {
1630                 .br = br
1631         };
1632         struct netdev_nested_priv priv = {
1633                 .data = (void *)&data,
1634         };
1635
1636         rcu_read_lock();
1637         netdev_walk_all_upper_dev_rcu(dev, br_vlan_link_state_change_fn,
1638                                       &priv);
1639         rcu_read_unlock();
1640 }
1641
1642 /* Must be protected by RTNL. */
1643 static void nbp_vlan_set_vlan_dev_state(struct net_bridge_port *p, u16 vid)
1644 {
1645         struct net_device *vlan_dev;
1646
1647         if (!br_opt_get(p->br, BROPT_VLAN_BRIDGE_BINDING))
1648                 return;
1649
1650         vlan_dev = br_vlan_get_upper_bind_vlan_dev(p->br->dev, vid);
1651         if (vlan_dev)
1652                 br_vlan_set_vlan_dev_state(p->br, vlan_dev);
1653 }
1654
1655 /* Must be protected by RTNL. */
1656 int br_vlan_bridge_event(struct net_device *dev, unsigned long event, void *ptr)
1657 {
1658         struct netdev_notifier_changeupper_info *info;
1659         struct net_bridge *br = netdev_priv(dev);
1660         int vlcmd = 0, ret = 0;
1661         bool changed = false;
1662
1663         switch (event) {
1664         case NETDEV_REGISTER:
1665                 ret = br_vlan_add(br, br->default_pvid,
1666                                   BRIDGE_VLAN_INFO_PVID |
1667                                   BRIDGE_VLAN_INFO_UNTAGGED |
1668                                   BRIDGE_VLAN_INFO_BRENTRY, &changed, NULL);
1669                 vlcmd = RTM_NEWVLAN;
1670                 break;
1671         case NETDEV_UNREGISTER:
1672                 changed = !br_vlan_delete(br, br->default_pvid);
1673                 vlcmd = RTM_DELVLAN;
1674                 break;
1675         case NETDEV_CHANGEUPPER:
1676                 info = ptr;
1677                 br_vlan_upper_change(dev, info->upper_dev, info->linking);
1678                 break;
1679
1680         case NETDEV_CHANGE:
1681         case NETDEV_UP:
1682                 if (!br_opt_get(br, BROPT_VLAN_BRIDGE_BINDING))
1683                         break;
1684                 br_vlan_link_state_change(dev, br);
1685                 break;
1686         }
1687         if (changed)
1688                 br_vlan_notify(br, NULL, br->default_pvid, 0, vlcmd);
1689
1690         return ret;
1691 }
1692
1693 /* Must be protected by RTNL. */
1694 void br_vlan_port_event(struct net_bridge_port *p, unsigned long event)
1695 {
1696         if (!br_opt_get(p->br, BROPT_VLAN_BRIDGE_BINDING))
1697                 return;
1698
1699         switch (event) {
1700         case NETDEV_CHANGE:
1701         case NETDEV_DOWN:
1702         case NETDEV_UP:
1703                 br_vlan_set_all_vlan_dev_state(p);
1704                 break;
1705         }
1706 }
1707
1708 static bool br_vlan_stats_fill(struct sk_buff *skb,
1709                                const struct net_bridge_vlan *v)
1710 {
1711         struct pcpu_sw_netstats stats;
1712         struct nlattr *nest;
1713
1714         nest = nla_nest_start(skb, BRIDGE_VLANDB_ENTRY_STATS);
1715         if (!nest)
1716                 return false;
1717
1718         br_vlan_get_stats(v, &stats);
1719         if (nla_put_u64_64bit(skb, BRIDGE_VLANDB_STATS_RX_BYTES, stats.rx_bytes,
1720                               BRIDGE_VLANDB_STATS_PAD) ||
1721             nla_put_u64_64bit(skb, BRIDGE_VLANDB_STATS_RX_PACKETS,
1722                               stats.rx_packets, BRIDGE_VLANDB_STATS_PAD) ||
1723             nla_put_u64_64bit(skb, BRIDGE_VLANDB_STATS_TX_BYTES, stats.tx_bytes,
1724                               BRIDGE_VLANDB_STATS_PAD) ||
1725             nla_put_u64_64bit(skb, BRIDGE_VLANDB_STATS_TX_PACKETS,
1726                               stats.tx_packets, BRIDGE_VLANDB_STATS_PAD))
1727                 goto out_err;
1728
1729         nla_nest_end(skb, nest);
1730
1731         return true;
1732
1733 out_err:
1734         nla_nest_cancel(skb, nest);
1735         return false;
1736 }
1737
1738 /* v_opts is used to dump the options which must be equal in the whole range */
1739 static bool br_vlan_fill_vids(struct sk_buff *skb, u16 vid, u16 vid_range,
1740                               const struct net_bridge_vlan *v_opts,
1741                               u16 flags,
1742                               bool dump_stats)
1743 {
1744         struct bridge_vlan_info info;
1745         struct nlattr *nest;
1746
1747         nest = nla_nest_start(skb, BRIDGE_VLANDB_ENTRY);
1748         if (!nest)
1749                 return false;
1750
1751         memset(&info, 0, sizeof(info));
1752         info.vid = vid;
1753         if (flags & BRIDGE_VLAN_INFO_UNTAGGED)
1754                 info.flags |= BRIDGE_VLAN_INFO_UNTAGGED;
1755         if (flags & BRIDGE_VLAN_INFO_PVID)
1756                 info.flags |= BRIDGE_VLAN_INFO_PVID;
1757
1758         if (nla_put(skb, BRIDGE_VLANDB_ENTRY_INFO, sizeof(info), &info))
1759                 goto out_err;
1760
1761         if (vid_range && vid < vid_range &&
1762             !(flags & BRIDGE_VLAN_INFO_PVID) &&
1763             nla_put_u16(skb, BRIDGE_VLANDB_ENTRY_RANGE, vid_range))
1764                 goto out_err;
1765
1766         if (v_opts) {
1767                 if (!br_vlan_opts_fill(skb, v_opts))
1768                         goto out_err;
1769
1770                 if (dump_stats && !br_vlan_stats_fill(skb, v_opts))
1771                         goto out_err;
1772         }
1773
1774         nla_nest_end(skb, nest);
1775
1776         return true;
1777
1778 out_err:
1779         nla_nest_cancel(skb, nest);
1780         return false;
1781 }
1782
1783 static size_t rtnl_vlan_nlmsg_size(void)
1784 {
1785         return NLMSG_ALIGN(sizeof(struct br_vlan_msg))
1786                 + nla_total_size(0) /* BRIDGE_VLANDB_ENTRY */
1787                 + nla_total_size(sizeof(u16)) /* BRIDGE_VLANDB_ENTRY_RANGE */
1788                 + nla_total_size(sizeof(struct bridge_vlan_info)) /* BRIDGE_VLANDB_ENTRY_INFO */
1789                 + br_vlan_opts_nl_size(); /* bridge vlan options */
1790 }
1791
1792 void br_vlan_notify(const struct net_bridge *br,
1793                     const struct net_bridge_port *p,
1794                     u16 vid, u16 vid_range,
1795                     int cmd)
1796 {
1797         struct net_bridge_vlan_group *vg;
1798         struct net_bridge_vlan *v = NULL;
1799         struct br_vlan_msg *bvm;
1800         struct nlmsghdr *nlh;
1801         struct sk_buff *skb;
1802         int err = -ENOBUFS;
1803         struct net *net;
1804         u16 flags = 0;
1805         int ifindex;
1806
1807         /* right now notifications are done only with rtnl held */
1808         ASSERT_RTNL();
1809
1810         if (p) {
1811                 ifindex = p->dev->ifindex;
1812                 vg = nbp_vlan_group(p);
1813                 net = dev_net(p->dev);
1814         } else {
1815                 ifindex = br->dev->ifindex;
1816                 vg = br_vlan_group(br);
1817                 net = dev_net(br->dev);
1818         }
1819
1820         skb = nlmsg_new(rtnl_vlan_nlmsg_size(), GFP_KERNEL);
1821         if (!skb)
1822                 goto out_err;
1823
1824         err = -EMSGSIZE;
1825         nlh = nlmsg_put(skb, 0, 0, cmd, sizeof(*bvm), 0);
1826         if (!nlh)
1827                 goto out_err;
1828         bvm = nlmsg_data(nlh);
1829         memset(bvm, 0, sizeof(*bvm));
1830         bvm->family = AF_BRIDGE;
1831         bvm->ifindex = ifindex;
1832
1833         switch (cmd) {
1834         case RTM_NEWVLAN:
1835                 /* need to find the vlan due to flags/options */
1836                 v = br_vlan_find(vg, vid);
1837                 if (!v || !br_vlan_should_use(v))
1838                         goto out_kfree;
1839
1840                 flags = v->flags;
1841                 if (br_get_pvid(vg) == v->vid)
1842                         flags |= BRIDGE_VLAN_INFO_PVID;
1843                 break;
1844         case RTM_DELVLAN:
1845                 break;
1846         default:
1847                 goto out_kfree;
1848         }
1849
1850         if (!br_vlan_fill_vids(skb, vid, vid_range, v, flags, false))
1851                 goto out_err;
1852
1853         nlmsg_end(skb, nlh);
1854         rtnl_notify(skb, net, 0, RTNLGRP_BRVLAN, NULL, GFP_KERNEL);
1855         return;
1856
1857 out_err:
1858         rtnl_set_sk_err(net, RTNLGRP_BRVLAN, err);
1859 out_kfree:
1860         kfree_skb(skb);
1861 }
1862
1863 /* check if v_curr can enter a range ending in range_end */
1864 bool br_vlan_can_enter_range(const struct net_bridge_vlan *v_curr,
1865                              const struct net_bridge_vlan *range_end)
1866 {
1867         return v_curr->vid - range_end->vid == 1 &&
1868                range_end->flags == v_curr->flags &&
1869                br_vlan_opts_eq_range(v_curr, range_end);
1870 }
1871
1872 static int br_vlan_dump_dev(const struct net_device *dev,
1873                             struct sk_buff *skb,
1874                             struct netlink_callback *cb,
1875                             u32 dump_flags)
1876 {
1877         struct net_bridge_vlan *v, *range_start = NULL, *range_end = NULL;
1878         bool dump_global = !!(dump_flags & BRIDGE_VLANDB_DUMPF_GLOBAL);
1879         bool dump_stats = !!(dump_flags & BRIDGE_VLANDB_DUMPF_STATS);
1880         struct net_bridge_vlan_group *vg;
1881         int idx = 0, s_idx = cb->args[1];
1882         struct nlmsghdr *nlh = NULL;
1883         struct net_bridge_port *p;
1884         struct br_vlan_msg *bvm;
1885         struct net_bridge *br;
1886         int err = 0;
1887         u16 pvid;
1888
1889         if (!netif_is_bridge_master(dev) && !netif_is_bridge_port(dev))
1890                 return -EINVAL;
1891
1892         if (netif_is_bridge_master(dev)) {
1893                 br = netdev_priv(dev);
1894                 vg = br_vlan_group_rcu(br);
1895                 p = NULL;
1896         } else {
1897                 /* global options are dumped only for bridge devices */
1898                 if (dump_global)
1899                         return 0;
1900
1901                 p = br_port_get_rcu(dev);
1902                 if (WARN_ON(!p))
1903                         return -EINVAL;
1904                 vg = nbp_vlan_group_rcu(p);
1905                 br = p->br;
1906         }
1907
1908         if (!vg)
1909                 return 0;
1910
1911         nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1912                         RTM_NEWVLAN, sizeof(*bvm), NLM_F_MULTI);
1913         if (!nlh)
1914                 return -EMSGSIZE;
1915         bvm = nlmsg_data(nlh);
1916         memset(bvm, 0, sizeof(*bvm));
1917         bvm->family = PF_BRIDGE;
1918         bvm->ifindex = dev->ifindex;
1919         pvid = br_get_pvid(vg);
1920
1921         /* idx must stay at range's beginning until it is filled in */
1922         list_for_each_entry_rcu(v, &vg->vlan_list, vlist) {
1923                 if (!dump_global && !br_vlan_should_use(v))
1924                         continue;
1925                 if (idx < s_idx) {
1926                         idx++;
1927                         continue;
1928                 }
1929
1930                 if (!range_start) {
1931                         range_start = v;
1932                         range_end = v;
1933                         continue;
1934                 }
1935
1936                 if (dump_global) {
1937                         if (br_vlan_global_opts_can_enter_range(v, range_end))
1938                                 goto update_end;
1939                         if (!br_vlan_global_opts_fill(skb, range_start->vid,
1940                                                       range_end->vid,
1941                                                       range_start)) {
1942                                 err = -EMSGSIZE;
1943                                 break;
1944                         }
1945                         /* advance number of filled vlans */
1946                         idx += range_end->vid - range_start->vid + 1;
1947
1948                         range_start = v;
1949                 } else if (dump_stats || v->vid == pvid ||
1950                            !br_vlan_can_enter_range(v, range_end)) {
1951                         u16 vlan_flags = br_vlan_flags(range_start, pvid);
1952
1953                         if (!br_vlan_fill_vids(skb, range_start->vid,
1954                                                range_end->vid, range_start,
1955                                                vlan_flags, dump_stats)) {
1956                                 err = -EMSGSIZE;
1957                                 break;
1958                         }
1959                         /* advance number of filled vlans */
1960                         idx += range_end->vid - range_start->vid + 1;
1961
1962                         range_start = v;
1963                 }
1964 update_end:
1965                 range_end = v;
1966         }
1967
1968         /* err will be 0 and range_start will be set in 3 cases here:
1969          * - first vlan (range_start == range_end)
1970          * - last vlan (range_start == range_end, not in range)
1971          * - last vlan range (range_start != range_end, in range)
1972          */
1973         if (!err && range_start) {
1974                 if (dump_global &&
1975                     !br_vlan_global_opts_fill(skb, range_start->vid,
1976                                               range_end->vid, range_start))
1977                         err = -EMSGSIZE;
1978                 else if (!dump_global &&
1979                          !br_vlan_fill_vids(skb, range_start->vid,
1980                                             range_end->vid, range_start,
1981                                             br_vlan_flags(range_start, pvid),
1982                                             dump_stats))
1983                         err = -EMSGSIZE;
1984         }
1985
1986         cb->args[1] = err ? idx : 0;
1987
1988         nlmsg_end(skb, nlh);
1989
1990         return err;
1991 }
1992
1993 static const struct nla_policy br_vlan_db_dump_pol[BRIDGE_VLANDB_DUMP_MAX + 1] = {
1994         [BRIDGE_VLANDB_DUMP_FLAGS] = { .type = NLA_U32 },
1995 };
1996
1997 static int br_vlan_rtm_dump(struct sk_buff *skb, struct netlink_callback *cb)
1998 {
1999         struct nlattr *dtb[BRIDGE_VLANDB_DUMP_MAX + 1];
2000         int idx = 0, err = 0, s_idx = cb->args[0];
2001         struct net *net = sock_net(skb->sk);
2002         struct br_vlan_msg *bvm;
2003         struct net_device *dev;
2004         u32 dump_flags = 0;
2005
2006         err = nlmsg_parse(cb->nlh, sizeof(*bvm), dtb, BRIDGE_VLANDB_DUMP_MAX,
2007                           br_vlan_db_dump_pol, cb->extack);
2008         if (err < 0)
2009                 return err;
2010
2011         bvm = nlmsg_data(cb->nlh);
2012         if (dtb[BRIDGE_VLANDB_DUMP_FLAGS])
2013                 dump_flags = nla_get_u32(dtb[BRIDGE_VLANDB_DUMP_FLAGS]);
2014
2015         rcu_read_lock();
2016         if (bvm->ifindex) {
2017                 dev = dev_get_by_index_rcu(net, bvm->ifindex);
2018                 if (!dev) {
2019                         err = -ENODEV;
2020                         goto out_err;
2021                 }
2022                 err = br_vlan_dump_dev(dev, skb, cb, dump_flags);
2023                 /* if the dump completed without an error we return 0 here */
2024                 if (err != -EMSGSIZE)
2025                         goto out_err;
2026         } else {
2027                 for_each_netdev_rcu(net, dev) {
2028                         if (idx < s_idx)
2029                                 goto skip;
2030
2031                         err = br_vlan_dump_dev(dev, skb, cb, dump_flags);
2032                         if (err == -EMSGSIZE)
2033                                 break;
2034 skip:
2035                         idx++;
2036                 }
2037         }
2038         cb->args[0] = idx;
2039         rcu_read_unlock();
2040
2041         return skb->len;
2042
2043 out_err:
2044         rcu_read_unlock();
2045
2046         return err;
2047 }
2048
2049 static const struct nla_policy br_vlan_db_policy[BRIDGE_VLANDB_ENTRY_MAX + 1] = {
2050         [BRIDGE_VLANDB_ENTRY_INFO]      =
2051                 NLA_POLICY_EXACT_LEN(sizeof(struct bridge_vlan_info)),
2052         [BRIDGE_VLANDB_ENTRY_RANGE]     = { .type = NLA_U16 },
2053         [BRIDGE_VLANDB_ENTRY_STATE]     = { .type = NLA_U8 },
2054         [BRIDGE_VLANDB_ENTRY_TUNNEL_INFO] = { .type = NLA_NESTED },
2055         [BRIDGE_VLANDB_ENTRY_MCAST_ROUTER]      = { .type = NLA_U8 },
2056 };
2057
2058 static int br_vlan_rtm_process_one(struct net_device *dev,
2059                                    const struct nlattr *attr,
2060                                    int cmd, struct netlink_ext_ack *extack)
2061 {
2062         struct bridge_vlan_info *vinfo, vrange_end, *vinfo_last = NULL;
2063         struct nlattr *tb[BRIDGE_VLANDB_ENTRY_MAX + 1];
2064         bool changed = false, skip_processing = false;
2065         struct net_bridge_vlan_group *vg;
2066         struct net_bridge_port *p = NULL;
2067         int err = 0, cmdmap = 0;
2068         struct net_bridge *br;
2069
2070         if (netif_is_bridge_master(dev)) {
2071                 br = netdev_priv(dev);
2072                 vg = br_vlan_group(br);
2073         } else {
2074                 p = br_port_get_rtnl(dev);
2075                 if (WARN_ON(!p))
2076                         return -ENODEV;
2077                 br = p->br;
2078                 vg = nbp_vlan_group(p);
2079         }
2080
2081         if (WARN_ON(!vg))
2082                 return -ENODEV;
2083
2084         err = nla_parse_nested(tb, BRIDGE_VLANDB_ENTRY_MAX, attr,
2085                                br_vlan_db_policy, extack);
2086         if (err)
2087                 return err;
2088
2089         if (!tb[BRIDGE_VLANDB_ENTRY_INFO]) {
2090                 NL_SET_ERR_MSG_MOD(extack, "Missing vlan entry info");
2091                 return -EINVAL;
2092         }
2093         memset(&vrange_end, 0, sizeof(vrange_end));
2094
2095         vinfo = nla_data(tb[BRIDGE_VLANDB_ENTRY_INFO]);
2096         if (vinfo->flags & (BRIDGE_VLAN_INFO_RANGE_BEGIN |
2097                             BRIDGE_VLAN_INFO_RANGE_END)) {
2098                 NL_SET_ERR_MSG_MOD(extack, "Old-style vlan ranges are not allowed when using RTM vlan calls");
2099                 return -EINVAL;
2100         }
2101         if (!br_vlan_valid_id(vinfo->vid, extack))
2102                 return -EINVAL;
2103
2104         if (tb[BRIDGE_VLANDB_ENTRY_RANGE]) {
2105                 vrange_end.vid = nla_get_u16(tb[BRIDGE_VLANDB_ENTRY_RANGE]);
2106                 /* validate user-provided flags without RANGE_BEGIN */
2107                 vrange_end.flags = BRIDGE_VLAN_INFO_RANGE_END | vinfo->flags;
2108                 vinfo->flags |= BRIDGE_VLAN_INFO_RANGE_BEGIN;
2109
2110                 /* vinfo_last is the range start, vinfo the range end */
2111                 vinfo_last = vinfo;
2112                 vinfo = &vrange_end;
2113
2114                 if (!br_vlan_valid_id(vinfo->vid, extack) ||
2115                     !br_vlan_valid_range(vinfo, vinfo_last, extack))
2116                         return -EINVAL;
2117         }
2118
2119         switch (cmd) {
2120         case RTM_NEWVLAN:
2121                 cmdmap = RTM_SETLINK;
2122                 skip_processing = !!(vinfo->flags & BRIDGE_VLAN_INFO_ONLY_OPTS);
2123                 break;
2124         case RTM_DELVLAN:
2125                 cmdmap = RTM_DELLINK;
2126                 break;
2127         }
2128
2129         if (!skip_processing) {
2130                 struct bridge_vlan_info *tmp_last = vinfo_last;
2131
2132                 /* br_process_vlan_info may overwrite vinfo_last */
2133                 err = br_process_vlan_info(br, p, cmdmap, vinfo, &tmp_last,
2134                                            &changed, extack);
2135
2136                 /* notify first if anything changed */
2137                 if (changed)
2138                         br_ifinfo_notify(cmdmap, br, p);
2139
2140                 if (err)
2141                         return err;
2142         }
2143
2144         /* deal with options */
2145         if (cmd == RTM_NEWVLAN) {
2146                 struct net_bridge_vlan *range_start, *range_end;
2147
2148                 if (vinfo_last) {
2149                         range_start = br_vlan_find(vg, vinfo_last->vid);
2150                         range_end = br_vlan_find(vg, vinfo->vid);
2151                 } else {
2152                         range_start = br_vlan_find(vg, vinfo->vid);
2153                         range_end = range_start;
2154                 }
2155
2156                 err = br_vlan_process_options(br, p, range_start, range_end,
2157                                               tb, extack);
2158         }
2159
2160         return err;
2161 }
2162
2163 static int br_vlan_rtm_process(struct sk_buff *skb, struct nlmsghdr *nlh,
2164                                struct netlink_ext_ack *extack)
2165 {
2166         struct net *net = sock_net(skb->sk);
2167         struct br_vlan_msg *bvm;
2168         struct net_device *dev;
2169         struct nlattr *attr;
2170         int err, vlans = 0;
2171         int rem;
2172
2173         /* this should validate the header and check for remaining bytes */
2174         err = nlmsg_parse(nlh, sizeof(*bvm), NULL, BRIDGE_VLANDB_MAX, NULL,
2175                           extack);
2176         if (err < 0)
2177                 return err;
2178
2179         bvm = nlmsg_data(nlh);
2180         dev = __dev_get_by_index(net, bvm->ifindex);
2181         if (!dev)
2182                 return -ENODEV;
2183
2184         if (!netif_is_bridge_master(dev) && !netif_is_bridge_port(dev)) {
2185                 NL_SET_ERR_MSG_MOD(extack, "The device is not a valid bridge or bridge port");
2186                 return -EINVAL;
2187         }
2188
2189         nlmsg_for_each_attr(attr, nlh, sizeof(*bvm), rem) {
2190                 switch (nla_type(attr)) {
2191                 case BRIDGE_VLANDB_ENTRY:
2192                         err = br_vlan_rtm_process_one(dev, attr,
2193                                                       nlh->nlmsg_type,
2194                                                       extack);
2195                         break;
2196                 case BRIDGE_VLANDB_GLOBAL_OPTIONS:
2197                         err = br_vlan_rtm_process_global_options(dev, attr,
2198                                                                  nlh->nlmsg_type,
2199                                                                  extack);
2200                         break;
2201                 default:
2202                         continue;
2203                 }
2204
2205                 vlans++;
2206                 if (err)
2207                         break;
2208         }
2209         if (!vlans) {
2210                 NL_SET_ERR_MSG_MOD(extack, "No vlans found to process");
2211                 err = -EINVAL;
2212         }
2213
2214         return err;
2215 }
2216
2217 void br_vlan_rtnl_init(void)
2218 {
2219         rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_GETVLAN, NULL,
2220                              br_vlan_rtm_dump, 0);
2221         rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_NEWVLAN,
2222                              br_vlan_rtm_process, NULL, 0);
2223         rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_DELVLAN,
2224                              br_vlan_rtm_process, NULL, 0);
2225 }
2226
2227 void br_vlan_rtnl_uninit(void)
2228 {
2229         rtnl_unregister(PF_BRIDGE, RTM_GETVLAN);
2230         rtnl_unregister(PF_BRIDGE, RTM_NEWVLAN);
2231         rtnl_unregister(PF_BRIDGE, RTM_DELVLAN);
2232 }