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_insert(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                                 return br_vlan_state_allowed(*state, true);
 564                         } else {
 565                                 return true;
 566                         }
 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_insert(br, NULL, br->dev->dev_addr,
 687                                     vlan->vid);
 688                 if (err) {
 689                         br_err(br, "failed to insert local address into bridge forwarding table\n");
 690                         goto err_fdb_insert;
 691                 }
 692
 693                 refcount_inc(&vlan->refcnt);
 694                 vlan->flags |= BRIDGE_VLAN_INFO_BRENTRY;
 695                 vg->num_vlans++;
 696                 *changed = true;
 697                 br_multicast_toggle_one_vlan(vlan, true);
 698         }
 699
 700         if (__vlan_add_flags(vlan, flags))
 701                 *changed = true;
 702
 703         return 0;
 704
 705 err_fdb_insert:
 706 err_flags:
 707         br_switchdev_port_vlan_del(br->dev, vlan->vid);
 708         return err;
 709 }
 710
 711 /* Must be protected by RTNL.
 712  * Must be called with vid in range from 1 to 4094 inclusive.
 713  * changed must be true only if the vlan was created or updated
 714  */
 715 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, bool *changed,
 716                 struct netlink_ext_ack *extack)
 717 {
 718         struct net_bridge_vlan_group *vg;
 719         struct net_bridge_vlan *vlan;
 720         int ret;
 721
 722         ASSERT_RTNL();
 723
 724         *changed = false;
 725         vg = br_vlan_group(br);
 726         vlan = br_vlan_find(vg, vid);
 727         if (vlan)
 728                 return br_vlan_add_existing(br, vg, vlan, flags, changed,
 729                                             extack);
 730
 731         vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
 732         if (!vlan)
 733                 return -ENOMEM;
 734
 735         vlan->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
 736         if (!vlan->stats) {
 737                 kfree(vlan);
 738                 return -ENOMEM;
 739         }
 740         vlan->vid = vid;
 741         vlan->flags = flags | BRIDGE_VLAN_INFO_MASTER;
 742         vlan->flags &= ~BRIDGE_VLAN_INFO_PVID;
 743         vlan->br = br;
 744         if (flags & BRIDGE_VLAN_INFO_BRENTRY)
 745                 refcount_set(&vlan->refcnt, 1);
 746         ret = __vlan_add(vlan, flags, extack);
 747         if (ret) {
 748                 free_percpu(vlan->stats);
 749                 kfree(vlan);
 750         } else {
 751                 *changed = true;
 752         }
 753
 754         return ret;
 755 }
 756
 757 /* Must be protected by RTNL.
 758  * Must be called with vid in range from 1 to 4094 inclusive.
 759  */
 760 int br_vlan_delete(struct net_bridge *br, u16 vid)
 761 {
 762         struct net_bridge_vlan_group *vg;
 763         struct net_bridge_vlan *v;
 764
 765         ASSERT_RTNL();
 766
 767         vg = br_vlan_group(br);
 768         v = br_vlan_find(vg, vid);
 769         if (!v || !br_vlan_is_brentry(v))
 770                 return -ENOENT;
 771
 772         br_fdb_find_delete_local(br, NULL, br->dev->dev_addr, vid);
 773         br_fdb_delete_by_port(br, NULL, vid, 0);
 774
 775         vlan_tunnel_info_del(vg, v);
 776
 777         return __vlan_del(v);
 778 }
 779
 780 void br_vlan_flush(struct net_bridge *br)
 781 {
 782         struct net_bridge_vlan_group *vg;
 783
 784         ASSERT_RTNL();
 785
 786         vg = br_vlan_group(br);
 787         __vlan_flush(br, NULL, vg);
 788         RCU_INIT_POINTER(br->vlgrp, NULL);
 789         synchronize_rcu();
 790         __vlan_group_free(vg);
 791 }
 792
 793 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid)
 794 {
 795         if (!vg)
 796                 return NULL;
 797
 798         return br_vlan_lookup(&vg->vlan_hash, vid);
 799 }
 800
 801 /* Must be protected by RTNL. */
 802 static void recalculate_group_addr(struct net_bridge *br)
 803 {
 804         if (br_opt_get(br, BROPT_GROUP_ADDR_SET))
 805                 return;
 806
 807         spin_lock_bh(&br->lock);
 808         if (!br_opt_get(br, BROPT_VLAN_ENABLED) ||
 809             br->vlan_proto == htons(ETH_P_8021Q)) {
 810                 /* Bridge Group Address */
 811                 br->group_addr[5] = 0x00;
 812         } else { /* vlan_enabled && ETH_P_8021AD */
 813                 /* Provider Bridge Group Address */
 814                 br->group_addr[5] = 0x08;
 815         }
 816         spin_unlock_bh(&br->lock);
 817 }
 818
 819 /* Must be protected by RTNL. */
 820 void br_recalculate_fwd_mask(struct net_bridge *br)
 821 {
 822         if (!br_opt_get(br, BROPT_VLAN_ENABLED) ||
 823             br->vlan_proto == htons(ETH_P_8021Q))
 824                 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
 825         else /* vlan_enabled && ETH_P_8021AD */
 826                 br->group_fwd_mask_required = BR_GROUPFWD_8021AD &
 827                                               ~(1u << br->group_addr[5]);
 828 }
 829
 830 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val,
 831                           struct netlink_ext_ack *extack)
 832 {
 833         struct switchdev_attr attr = {
 834                 .orig_dev = br->dev,
 835                 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
 836                 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
 837                 .u.vlan_filtering = val,
 838         };
 839         int err;
 840
 841         if (br_opt_get(br, BROPT_VLAN_ENABLED) == !!val)
 842                 return 0;
 843
 844         br_opt_toggle(br, BROPT_VLAN_ENABLED, !!val);
 845
 846         err = switchdev_port_attr_set(br->dev, &attr, extack);
 847         if (err && err != -EOPNOTSUPP) {
 848                 br_opt_toggle(br, BROPT_VLAN_ENABLED, !val);
 849                 return err;
 850         }
 851
 852         br_manage_promisc(br);
 853         recalculate_group_addr(br);
 854         br_recalculate_fwd_mask(br);
 855         if (!val && br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) {
 856                 br_info(br, "vlan filtering disabled, automatically disabling multicast vlan snooping\n");
 857                 br_multicast_toggle_vlan_snooping(br, false, NULL);
 858         }
 859
 860         return 0;
 861 }
 862
 863 bool br_vlan_enabled(const struct net_device *dev)
 864 {
 865         struct net_bridge *br = netdev_priv(dev);
 866
 867         return br_opt_get(br, BROPT_VLAN_ENABLED);
 868 }
 869 EXPORT_SYMBOL_GPL(br_vlan_enabled);
 870
 871 int br_vlan_get_proto(const struct net_device *dev, u16 *p_proto)
 872 {
 873         struct net_bridge *br = netdev_priv(dev);
 874
 875         *p_proto = ntohs(br->vlan_proto);
 876
 877         return 0;
 878 }
 879 EXPORT_SYMBOL_GPL(br_vlan_get_proto);
 880
 881 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto,
 882                         struct netlink_ext_ack *extack)
 883 {
 884         struct switchdev_attr attr = {
 885                 .orig_dev = br->dev,
 886                 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_PROTOCOL,
 887                 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
 888                 .u.vlan_protocol = ntohs(proto),
 889         };
 890         int err = 0;
 891         struct net_bridge_port *p;
 892         struct net_bridge_vlan *vlan;
 893         struct net_bridge_vlan_group *vg;
 894         __be16 oldproto = br->vlan_proto;
 895
 896         if (br->vlan_proto == proto)
 897                 return 0;
 898
 899         err = switchdev_port_attr_set(br->dev, &attr, extack);
 900         if (err && err != -EOPNOTSUPP)
 901                 return err;
 902
 903         /* Add VLANs for the new proto to the device filter. */
 904         list_for_each_entry(p, &br->port_list, list) {
 905                 vg = nbp_vlan_group(p);
 906                 list_for_each_entry(vlan, &vg->vlan_list, vlist) {
 907                         err = vlan_vid_add(p->dev, proto, vlan->vid);
 908                         if (err)
 909                                 goto err_filt;
 910                 }
 911         }
 912
 913         br->vlan_proto = proto;
 914
 915         recalculate_group_addr(br);
 916         br_recalculate_fwd_mask(br);
 917
 918         /* Delete VLANs for the old proto from the device filter. */
 919         list_for_each_entry(p, &br->port_list, list) {
 920                 vg = nbp_vlan_group(p);
 921                 list_for_each_entry(vlan, &vg->vlan_list, vlist)
 922                         vlan_vid_del(p->dev, oldproto, vlan->vid);
 923         }
 924
 925         return 0;
 926
 927 err_filt:
 928         attr.u.vlan_protocol = ntohs(oldproto);
 929         switchdev_port_attr_set(br->dev, &attr, NULL);
 930
 931         list_for_each_entry_continue_reverse(vlan, &vg->vlan_list, vlist)
 932                 vlan_vid_del(p->dev, proto, vlan->vid);
 933
 934         list_for_each_entry_continue_reverse(p, &br->port_list, list) {
 935                 vg = nbp_vlan_group(p);
 936                 list_for_each_entry(vlan, &vg->vlan_list, vlist)
 937                         vlan_vid_del(p->dev, proto, vlan->vid);
 938         }
 939
 940         return err;
 941 }
 942
 943 int br_vlan_set_proto(struct net_bridge *br, unsigned long val,
 944                       struct netlink_ext_ack *extack)
 945 {
 946         if (!eth_type_vlan(htons(val)))
 947                 return -EPROTONOSUPPORT;
 948
 949         return __br_vlan_set_proto(br, htons(val), extack);
 950 }
 951
 952 int br_vlan_set_stats(struct net_bridge *br, unsigned long val)
 953 {
 954         switch (val) {
 955         case 0:
 956         case 1:
 957                 br_opt_toggle(br, BROPT_VLAN_STATS_ENABLED, !!val);
 958                 break;
 959         default:
 960                 return -EINVAL;
 961         }
 962
 963         return 0;
 964 }
 965
 966 int br_vlan_set_stats_per_port(struct net_bridge *br, unsigned long val)
 967 {
 968         struct net_bridge_port *p;
 969
 970         /* allow to change the option if there are no port vlans configured */
 971         list_for_each_entry(p, &br->port_list, list) {
 972                 struct net_bridge_vlan_group *vg = nbp_vlan_group(p);
 973
 974                 if (vg->num_vlans)
 975                         return -EBUSY;
 976         }
 977
 978         switch (val) {
 979         case 0:
 980         case 1:
 981                 br_opt_toggle(br, BROPT_VLAN_STATS_PER_PORT, !!val);
 982                 break;
 983         default:
 984                 return -EINVAL;
 985         }
 986
 987         return 0;
 988 }
 989
 990 static bool vlan_default_pvid(struct net_bridge_vlan_group *vg, u16 vid)
 991 {
 992         struct net_bridge_vlan *v;
 993
 994         if (vid != vg->pvid)
 995                 return false;
 996
 997         v = br_vlan_lookup(&vg->vlan_hash, vid);
 998         if (v && br_vlan_should_use(v) &&
 999             (v->flags & BRIDGE_VLAN_INFO_UNTAGGED))
1000                 return true;
1001
1002         return false;
1003 }
1004
1005 static void br_vlan_disable_default_pvid(struct net_bridge *br)
1006 {
1007         struct net_bridge_port *p;
1008         u16 pvid = br->default_pvid;
1009
1010         /* Disable default_pvid on all ports where it is still
1011          * configured.
1012          */
1013         if (vlan_default_pvid(br_vlan_group(br), pvid)) {
1014                 if (!br_vlan_delete(br, pvid))
1015                         br_vlan_notify(br, NULL, pvid, 0, RTM_DELVLAN);
1016         }
1017
1018         list_for_each_entry(p, &br->port_list, list) {
1019                 if (vlan_default_pvid(nbp_vlan_group(p), pvid) &&
1020                     !nbp_vlan_delete(p, pvid))
1021                         br_vlan_notify(br, p, pvid, 0, RTM_DELVLAN);
1022         }
1023
1024         br->default_pvid = 0;
1025 }
1026
1027 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid,
1028                                struct netlink_ext_ack *extack)
1029 {
1030         const struct net_bridge_vlan *pvent;
1031         struct net_bridge_vlan_group *vg;
1032         struct net_bridge_port *p;
1033         unsigned long *changed;
1034         bool vlchange;
1035         u16 old_pvid;
1036         int err = 0;
1037
1038         if (!pvid) {
1039                 br_vlan_disable_default_pvid(br);
1040                 return 0;
1041         }
1042
1043         changed = bitmap_zalloc(BR_MAX_PORTS, GFP_KERNEL);
1044         if (!changed)
1045                 return -ENOMEM;
1046
1047         old_pvid = br->default_pvid;
1048
1049         /* Update default_pvid config only if we do not conflict with
1050          * user configuration.
1051          */
1052         vg = br_vlan_group(br);
1053         pvent = br_vlan_find(vg, pvid);
1054         if ((!old_pvid || vlan_default_pvid(vg, old_pvid)) &&
1055             (!pvent || !br_vlan_should_use(pvent))) {
1056                 err = br_vlan_add(br, pvid,
1057                                   BRIDGE_VLAN_INFO_PVID |
1058                                   BRIDGE_VLAN_INFO_UNTAGGED |
1059                                   BRIDGE_VLAN_INFO_BRENTRY,
1060                                   &vlchange, extack);
1061                 if (err)
1062                         goto out;
1063
1064                 if (br_vlan_delete(br, old_pvid))
1065                         br_vlan_notify(br, NULL, old_pvid, 0, RTM_DELVLAN);
1066                 br_vlan_notify(br, NULL, pvid, 0, RTM_NEWVLAN);
1067                 set_bit(0, changed);
1068         }
1069
1070         list_for_each_entry(p, &br->port_list, list) {
1071                 /* Update default_pvid config only if we do not conflict with
1072                  * user configuration.
1073                  */
1074                 vg = nbp_vlan_group(p);
1075                 if ((old_pvid &&
1076                      !vlan_default_pvid(vg, old_pvid)) ||
1077                     br_vlan_find(vg, pvid))
1078                         continue;
1079
1080                 err = nbp_vlan_add(p, pvid,
1081                                    BRIDGE_VLAN_INFO_PVID |
1082                                    BRIDGE_VLAN_INFO_UNTAGGED,
1083                                    &vlchange, extack);
1084                 if (err)
1085                         goto err_port;
1086                 if (nbp_vlan_delete(p, old_pvid))
1087                         br_vlan_notify(br, p, old_pvid, 0, RTM_DELVLAN);
1088                 br_vlan_notify(p->br, p, pvid, 0, RTM_NEWVLAN);
1089                 set_bit(p->port_no, changed);
1090         }
1091
1092         br->default_pvid = pvid;
1093
1094 out:
1095         bitmap_free(changed);
1096         return err;
1097
1098 err_port:
1099         list_for_each_entry_continue_reverse(p, &br->port_list, list) {
1100                 if (!test_bit(p->port_no, changed))
1101                         continue;
1102
1103                 if (old_pvid) {
1104                         nbp_vlan_add(p, old_pvid,
1105                                      BRIDGE_VLAN_INFO_PVID |
1106                                      BRIDGE_VLAN_INFO_UNTAGGED,
1107                                      &vlchange, NULL);
1108                         br_vlan_notify(p->br, p, old_pvid, 0, RTM_NEWVLAN);
1109                 }
1110                 nbp_vlan_delete(p, pvid);
1111                 br_vlan_notify(br, p, pvid, 0, RTM_DELVLAN);
1112         }
1113
1114         if (test_bit(0, changed)) {
1115                 if (old_pvid) {
1116                         br_vlan_add(br, old_pvid,
1117                                     BRIDGE_VLAN_INFO_PVID |
1118                                     BRIDGE_VLAN_INFO_UNTAGGED |
1119                                     BRIDGE_VLAN_INFO_BRENTRY,
1120                                     &vlchange, NULL);
1121                         br_vlan_notify(br, NULL, old_pvid, 0, RTM_NEWVLAN);
1122                 }
1123                 br_vlan_delete(br, pvid);
1124                 br_vlan_notify(br, NULL, pvid, 0, RTM_DELVLAN);
1125         }
1126         goto out;
1127 }
1128
1129 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val,
1130                              struct netlink_ext_ack *extack)
1131 {
1132         u16 pvid = val;
1133         int err = 0;
1134
1135         if (val >= VLAN_VID_MASK)
1136                 return -EINVAL;
1137
1138         if (pvid == br->default_pvid)
1139                 goto out;
1140
1141         /* Only allow default pvid change when filtering is disabled */
1142         if (br_opt_get(br, BROPT_VLAN_ENABLED)) {
1143                 pr_info_once("Please disable vlan filtering to change default_pvid\n");
1144                 err = -EPERM;
1145                 goto out;
1146         }
1147         err = __br_vlan_set_default_pvid(br, pvid, extack);
1148 out:
1149         return err;
1150 }
1151
1152 int br_vlan_init(struct net_bridge *br)
1153 {
1154         struct net_bridge_vlan_group *vg;
1155         int ret = -ENOMEM;
1156
1157         vg = kzalloc(sizeof(*vg), GFP_KERNEL);
1158         if (!vg)
1159                 goto out;
1160         ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params);
1161         if (ret)
1162                 goto err_rhtbl;
1163         ret = vlan_tunnel_init(vg);
1164         if (ret)
1165                 goto err_tunnel_init;
1166         INIT_LIST_HEAD(&vg->vlan_list);
1167         br->vlan_proto = htons(ETH_P_8021Q);
1168         br->default_pvid = 1;
1169         rcu_assign_pointer(br->vlgrp, vg);
1170
1171 out:
1172         return ret;
1173
1174 err_tunnel_init:
1175         rhashtable_destroy(&vg->vlan_hash);
1176 err_rhtbl:
1177         kfree(vg);
1178
1179         goto out;
1180 }
1181
1182 int nbp_vlan_init(struct net_bridge_port *p, struct netlink_ext_ack *extack)
1183 {
1184         struct switchdev_attr attr = {
1185                 .orig_dev = p->br->dev,
1186                 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
1187                 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
1188                 .u.vlan_filtering = br_opt_get(p->br, BROPT_VLAN_ENABLED),
1189         };
1190         struct net_bridge_vlan_group *vg;
1191         int ret = -ENOMEM;
1192
1193         vg = kzalloc(sizeof(struct net_bridge_vlan_group), GFP_KERNEL);
1194         if (!vg)
1195                 goto out;
1196
1197         ret = switchdev_port_attr_set(p->dev, &attr, extack);
1198         if (ret && ret != -EOPNOTSUPP)
1199                 goto err_vlan_enabled;
1200
1201         ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params);
1202         if (ret)
1203                 goto err_rhtbl;
1204         ret = vlan_tunnel_init(vg);
1205         if (ret)
1206                 goto err_tunnel_init;
1207         INIT_LIST_HEAD(&vg->vlan_list);
1208         rcu_assign_pointer(p->vlgrp, vg);
1209         if (p->br->default_pvid) {
1210                 bool changed;
1211
1212                 ret = nbp_vlan_add(p, p->br->default_pvid,
1213                                    BRIDGE_VLAN_INFO_PVID |
1214                                    BRIDGE_VLAN_INFO_UNTAGGED,
1215                                    &changed, extack);
1216                 if (ret)
1217                         goto err_vlan_add;
1218                 br_vlan_notify(p->br, p, p->br->default_pvid, 0, RTM_NEWVLAN);
1219         }
1220 out:
1221         return ret;
1222
1223 err_vlan_add:
1224         RCU_INIT_POINTER(p->vlgrp, NULL);
1225         synchronize_rcu();
1226         vlan_tunnel_deinit(vg);
1227 err_tunnel_init:
1228         rhashtable_destroy(&vg->vlan_hash);
1229 err_rhtbl:
1230 err_vlan_enabled:
1231         kfree(vg);
1232
1233         goto out;
1234 }
1235
1236 /* Must be protected by RTNL.
1237  * Must be called with vid in range from 1 to 4094 inclusive.
1238  * changed must be true only if the vlan was created or updated
1239  */
1240 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
1241                  bool *changed, struct netlink_ext_ack *extack)
1242 {
1243         struct net_bridge_vlan *vlan;
1244         int ret;
1245
1246         ASSERT_RTNL();
1247
1248         *changed = false;
1249         vlan = br_vlan_find(nbp_vlan_group(port), vid);
1250         if (vlan) {
1251                 /* Pass the flags to the hardware bridge */
1252                 ret = br_switchdev_port_vlan_add(port->dev, vid, flags, extack);
1253                 if (ret && ret != -EOPNOTSUPP)
1254                         return ret;
1255                 *changed = __vlan_add_flags(vlan, flags);
1256
1257                 return 0;
1258         }
1259
1260         vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
1261         if (!vlan)
1262                 return -ENOMEM;
1263
1264         vlan->vid = vid;
1265         vlan->port = port;
1266         ret = __vlan_add(vlan, flags, extack);
1267         if (ret)
1268                 kfree(vlan);
1269         else
1270                 *changed = true;
1271
1272         return ret;
1273 }
1274
1275 /* Must be protected by RTNL.
1276  * Must be called with vid in range from 1 to 4094 inclusive.
1277  */
1278 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
1279 {
1280         struct net_bridge_vlan *v;
1281
1282         ASSERT_RTNL();
1283
1284         v = br_vlan_find(nbp_vlan_group(port), vid);
1285         if (!v)
1286                 return -ENOENT;
1287         br_fdb_find_delete_local(port->br, port, port->dev->dev_addr, vid);
1288         br_fdb_delete_by_port(port->br, port, vid, 0);
1289
1290         return __vlan_del(v);
1291 }
1292
1293 void nbp_vlan_flush(struct net_bridge_port *port)
1294 {
1295         struct net_bridge_vlan_group *vg;
1296
1297         ASSERT_RTNL();
1298
1299         vg = nbp_vlan_group(port);
1300         __vlan_flush(port->br, port, vg);
1301         RCU_INIT_POINTER(port->vlgrp, NULL);
1302         synchronize_rcu();
1303         __vlan_group_free(vg);
1304 }
1305
1306 void br_vlan_get_stats(const struct net_bridge_vlan *v,
1307                        struct pcpu_sw_netstats *stats)
1308 {
1309         int i;
1310
1311         memset(stats, 0, sizeof(*stats));
1312         for_each_possible_cpu(i) {
1313                 u64 rxpackets, rxbytes, txpackets, txbytes;
1314                 struct pcpu_sw_netstats *cpu_stats;
1315                 unsigned int start;
1316
1317                 cpu_stats = per_cpu_ptr(v->stats, i);
1318                 do {
1319                         start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1320                         rxpackets = cpu_stats->rx_packets;
1321                         rxbytes = cpu_stats->rx_bytes;
1322                         txbytes = cpu_stats->tx_bytes;
1323                         txpackets = cpu_stats->tx_packets;
1324                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
1325
1326                 stats->rx_packets += rxpackets;
1327                 stats->rx_bytes += rxbytes;
1328                 stats->tx_bytes += txbytes;
1329                 stats->tx_packets += txpackets;
1330         }
1331 }
1332
1333 int br_vlan_get_pvid(const struct net_device *dev, u16 *p_pvid)
1334 {
1335         struct net_bridge_vlan_group *vg;
1336         struct net_bridge_port *p;
1337
1338         ASSERT_RTNL();
1339         p = br_port_get_check_rtnl(dev);
1340         if (p)
1341                 vg = nbp_vlan_group(p);
1342         else if (netif_is_bridge_master(dev))
1343                 vg = br_vlan_group(netdev_priv(dev));
1344         else
1345                 return -EINVAL;
1346
1347         *p_pvid = br_get_pvid(vg);
1348         return 0;
1349 }
1350 EXPORT_SYMBOL_GPL(br_vlan_get_pvid);
1351
1352 int br_vlan_get_pvid_rcu(const struct net_device *dev, u16 *p_pvid)
1353 {
1354         struct net_bridge_vlan_group *vg;
1355         struct net_bridge_port *p;
1356
1357         p = br_port_get_check_rcu(dev);
1358         if (p)
1359                 vg = nbp_vlan_group_rcu(p);
1360         else if (netif_is_bridge_master(dev))
1361                 vg = br_vlan_group_rcu(netdev_priv(dev));
1362         else
1363                 return -EINVAL;
1364
1365         *p_pvid = br_get_pvid(vg);
1366         return 0;
1367 }
1368 EXPORT_SYMBOL_GPL(br_vlan_get_pvid_rcu);
1369
1370 void br_vlan_fill_forward_path_pvid(struct net_bridge *br,
1371                                     struct net_device_path_ctx *ctx,
1372                                     struct net_device_path *path)
1373 {
1374         struct net_bridge_vlan_group *vg;
1375         int idx = ctx->num_vlans - 1;
1376         u16 vid;
1377
1378         path->bridge.vlan_mode = DEV_PATH_BR_VLAN_KEEP;
1379
1380         if (!br_opt_get(br, BROPT_VLAN_ENABLED))
1381                 return;
1382
1383         vg = br_vlan_group(br);
1384
1385         if (idx >= 0 &&
1386             ctx->vlan[idx].proto == br->vlan_proto) {
1387                 vid = ctx->vlan[idx].id;
1388         } else {
1389                 path->bridge.vlan_mode = DEV_PATH_BR_VLAN_TAG;
1390                 vid = br_get_pvid(vg);
1391         }
1392
1393         path->bridge.vlan_id = vid;
1394         path->bridge.vlan_proto = br->vlan_proto;
1395 }
1396
1397 int br_vlan_fill_forward_path_mode(struct net_bridge *br,
1398                                    struct net_bridge_port *dst,
1399                                    struct net_device_path *path)
1400 {
1401         struct net_bridge_vlan_group *vg;
1402         struct net_bridge_vlan *v;
1403
1404         if (!br_opt_get(br, BROPT_VLAN_ENABLED))
1405                 return 0;
1406
1407         vg = nbp_vlan_group_rcu(dst);
1408         v = br_vlan_find(vg, path->bridge.vlan_id);
1409         if (!v || !br_vlan_should_use(v))
1410                 return -EINVAL;
1411
1412         if (!(v->flags & BRIDGE_VLAN_INFO_UNTAGGED))
1413                 return 0;
1414
1415         if (path->bridge.vlan_mode == DEV_PATH_BR_VLAN_TAG)
1416                 path->bridge.vlan_mode = DEV_PATH_BR_VLAN_KEEP;
1417         else if (v->priv_flags & BR_VLFLAG_ADDED_BY_SWITCHDEV)
1418                 path->bridge.vlan_mode = DEV_PATH_BR_VLAN_UNTAG_HW;
1419         else
1420                 path->bridge.vlan_mode = DEV_PATH_BR_VLAN_UNTAG;
1421
1422         return 0;
1423 }
1424
1425 int br_vlan_get_info(const struct net_device *dev, u16 vid,
1426                      struct bridge_vlan_info *p_vinfo)
1427 {
1428         struct net_bridge_vlan_group *vg;
1429         struct net_bridge_vlan *v;
1430         struct net_bridge_port *p;
1431
1432         ASSERT_RTNL();
1433         p = br_port_get_check_rtnl(dev);
1434         if (p)
1435                 vg = nbp_vlan_group(p);
1436         else if (netif_is_bridge_master(dev))
1437                 vg = br_vlan_group(netdev_priv(dev));
1438         else
1439                 return -EINVAL;
1440
1441         v = br_vlan_find(vg, vid);
1442         if (!v)
1443                 return -ENOENT;
1444
1445         p_vinfo->vid = vid;
1446         p_vinfo->flags = v->flags;
1447         if (vid == br_get_pvid(vg))
1448                 p_vinfo->flags |= BRIDGE_VLAN_INFO_PVID;
1449         return 0;
1450 }
1451 EXPORT_SYMBOL_GPL(br_vlan_get_info);
1452
1453 int br_vlan_get_info_rcu(const struct net_device *dev, u16 vid,
1454                          struct bridge_vlan_info *p_vinfo)
1455 {
1456         struct net_bridge_vlan_group *vg;
1457         struct net_bridge_vlan *v;
1458         struct net_bridge_port *p;
1459
1460         p = br_port_get_check_rcu(dev);
1461         if (p)
1462                 vg = nbp_vlan_group_rcu(p);
1463         else if (netif_is_bridge_master(dev))
1464                 vg = br_vlan_group_rcu(netdev_priv(dev));
1465         else
1466                 return -EINVAL;
1467
1468         v = br_vlan_find(vg, vid);
1469         if (!v)
1470                 return -ENOENT;
1471
1472         p_vinfo->vid = vid;
1473         p_vinfo->flags = v->flags;
1474         if (vid == br_get_pvid(vg))
1475                 p_vinfo->flags |= BRIDGE_VLAN_INFO_PVID;
1476         return 0;
1477 }
1478 EXPORT_SYMBOL_GPL(br_vlan_get_info_rcu);
1479
1480 static int br_vlan_is_bind_vlan_dev(const struct net_device *dev)
1481 {
1482         return is_vlan_dev(dev) &&
1483                 !!(vlan_dev_priv(dev)->flags & VLAN_FLAG_BRIDGE_BINDING);
1484 }
1485
1486 static int br_vlan_is_bind_vlan_dev_fn(struct net_device *dev,
1487                                __always_unused struct netdev_nested_priv *priv)
1488 {
1489         return br_vlan_is_bind_vlan_dev(dev);
1490 }
1491
1492 static bool br_vlan_has_upper_bind_vlan_dev(struct net_device *dev)
1493 {
1494         int found;
1495
1496         rcu_read_lock();
1497         found = netdev_walk_all_upper_dev_rcu(dev, br_vlan_is_bind_vlan_dev_fn,
1498                                               NULL);
1499         rcu_read_unlock();
1500
1501         return !!found;
1502 }
1503
1504 struct br_vlan_bind_walk_data {
1505         u16 vid;
1506         struct net_device *result;
1507 };
1508
1509 static int br_vlan_match_bind_vlan_dev_fn(struct net_device *dev,
1510                                           struct netdev_nested_priv *priv)
1511 {
1512         struct br_vlan_bind_walk_data *data = priv->data;
1513         int found = 0;
1514
1515         if (br_vlan_is_bind_vlan_dev(dev) &&
1516             vlan_dev_priv(dev)->vlan_id == data->vid) {
1517                 data->result = dev;
1518                 found = 1;
1519         }
1520
1521         return found;
1522 }
1523
1524 static struct net_device *
1525 br_vlan_get_upper_bind_vlan_dev(struct net_device *dev, u16 vid)
1526 {
1527         struct br_vlan_bind_walk_data data = {
1528                 .vid = vid,
1529         };
1530         struct netdev_nested_priv priv = {
1531                 .data = (void *)&data,
1532         };
1533
1534         rcu_read_lock();
1535         netdev_walk_all_upper_dev_rcu(dev, br_vlan_match_bind_vlan_dev_fn,
1536                                       &priv);
1537         rcu_read_unlock();
1538
1539         return data.result;
1540 }
1541
1542 static bool br_vlan_is_dev_up(const struct net_device *dev)
1543 {
1544         return  !!(dev->flags & IFF_UP) && netif_oper_up(dev);
1545 }
1546
1547 static void br_vlan_set_vlan_dev_state(const struct net_bridge *br,
1548                                        struct net_device *vlan_dev)
1549 {
1550         u16 vid = vlan_dev_priv(vlan_dev)->vlan_id;
1551         struct net_bridge_vlan_group *vg;
1552         struct net_bridge_port *p;
1553         bool has_carrier = false;
1554
1555         if (!netif_carrier_ok(br->dev)) {
1556                 netif_carrier_off(vlan_dev);
1557                 return;
1558         }
1559
1560         list_for_each_entry(p, &br->port_list, list) {
1561                 vg = nbp_vlan_group(p);
1562                 if (br_vlan_find(vg, vid) && br_vlan_is_dev_up(p->dev)) {
1563                         has_carrier = true;
1564                         break;
1565                 }
1566         }
1567
1568         if (has_carrier)
1569                 netif_carrier_on(vlan_dev);
1570         else
1571                 netif_carrier_off(vlan_dev);
1572 }
1573
1574 static void br_vlan_set_all_vlan_dev_state(struct net_bridge_port *p)
1575 {
1576         struct net_bridge_vlan_group *vg = nbp_vlan_group(p);
1577         struct net_bridge_vlan *vlan;
1578         struct net_device *vlan_dev;
1579
1580         list_for_each_entry(vlan, &vg->vlan_list, vlist) {
1581                 vlan_dev = br_vlan_get_upper_bind_vlan_dev(p->br->dev,
1582                                                            vlan->vid);
1583                 if (vlan_dev) {
1584                         if (br_vlan_is_dev_up(p->dev)) {
1585                                 if (netif_carrier_ok(p->br->dev))
1586                                         netif_carrier_on(vlan_dev);
1587                         } else {
1588                                 br_vlan_set_vlan_dev_state(p->br, vlan_dev);
1589                         }
1590                 }
1591         }
1592 }
1593
1594 static void br_vlan_upper_change(struct net_device *dev,
1595                                  struct net_device *upper_dev,
1596                                  bool linking)
1597 {
1598         struct net_bridge *br = netdev_priv(dev);
1599
1600         if (!br_vlan_is_bind_vlan_dev(upper_dev))
1601                 return;
1602
1603         if (linking) {
1604                 br_vlan_set_vlan_dev_state(br, upper_dev);
1605                 br_opt_toggle(br, BROPT_VLAN_BRIDGE_BINDING, true);
1606         } else {
1607                 br_opt_toggle(br, BROPT_VLAN_BRIDGE_BINDING,
1608                               br_vlan_has_upper_bind_vlan_dev(dev));
1609         }
1610 }
1611
1612 struct br_vlan_link_state_walk_data {
1613         struct net_bridge *br;
1614 };
1615
1616 static int br_vlan_link_state_change_fn(struct net_device *vlan_dev,
1617                                         struct netdev_nested_priv *priv)
1618 {
1619         struct br_vlan_link_state_walk_data *data = priv->data;
1620
1621         if (br_vlan_is_bind_vlan_dev(vlan_dev))
1622                 br_vlan_set_vlan_dev_state(data->br, vlan_dev);
1623
1624         return 0;
1625 }
1626
1627 static void br_vlan_link_state_change(struct net_device *dev,
1628                                       struct net_bridge *br)
1629 {
1630         struct br_vlan_link_state_walk_data data = {
1631                 .br = br
1632         };
1633         struct netdev_nested_priv priv = {
1634                 .data = (void *)&data,
1635         };
1636
1637         rcu_read_lock();
1638         netdev_walk_all_upper_dev_rcu(dev, br_vlan_link_state_change_fn,
1639                                       &priv);
1640         rcu_read_unlock();
1641 }
1642
1643 /* Must be protected by RTNL. */
1644 static void nbp_vlan_set_vlan_dev_state(struct net_bridge_port *p, u16 vid)
1645 {
1646         struct net_device *vlan_dev;
1647
1648         if (!br_opt_get(p->br, BROPT_VLAN_BRIDGE_BINDING))
1649                 return;
1650
1651         vlan_dev = br_vlan_get_upper_bind_vlan_dev(p->br->dev, vid);
1652         if (vlan_dev)
1653                 br_vlan_set_vlan_dev_state(p->br, vlan_dev);
1654 }
1655
1656 /* Must be protected by RTNL. */
1657 int br_vlan_bridge_event(struct net_device *dev, unsigned long event, void *ptr)
1658 {
1659         struct netdev_notifier_changeupper_info *info;
1660         struct net_bridge *br = netdev_priv(dev);
1661         int vlcmd = 0, ret = 0;
1662         bool changed = false;
1663
1664         switch (event) {
1665         case NETDEV_REGISTER:
1666                 ret = br_vlan_add(br, br->default_pvid,
1667                                   BRIDGE_VLAN_INFO_PVID |
1668                                   BRIDGE_VLAN_INFO_UNTAGGED |
1669                                   BRIDGE_VLAN_INFO_BRENTRY, &changed, NULL);
1670                 vlcmd = RTM_NEWVLAN;
1671                 break;
1672         case NETDEV_UNREGISTER:
1673                 changed = !br_vlan_delete(br, br->default_pvid);
1674                 vlcmd = RTM_DELVLAN;
1675                 break;
1676         case NETDEV_CHANGEUPPER:
1677                 info = ptr;
1678                 br_vlan_upper_change(dev, info->upper_dev, info->linking);
1679                 break;
1680
1681         case NETDEV_CHANGE:
1682         case NETDEV_UP:
1683                 if (!br_opt_get(br, BROPT_VLAN_BRIDGE_BINDING))
1684                         break;
1685                 br_vlan_link_state_change(dev, br);
1686                 break;
1687         }
1688         if (changed)
1689                 br_vlan_notify(br, NULL, br->default_pvid, 0, vlcmd);
1690
1691         return ret;
1692 }
1693
1694 /* Must be protected by RTNL. */
1695 void br_vlan_port_event(struct net_bridge_port *p, unsigned long event)
1696 {
1697         if (!br_opt_get(p->br, BROPT_VLAN_BRIDGE_BINDING))
1698                 return;
1699
1700         switch (event) {
1701         case NETDEV_CHANGE:
1702         case NETDEV_DOWN:
1703         case NETDEV_UP:
1704                 br_vlan_set_all_vlan_dev_state(p);
1705                 break;
1706         }
1707 }
1708
1709 static bool br_vlan_stats_fill(struct sk_buff *skb,
1710                                const struct net_bridge_vlan *v)
1711 {
1712         struct pcpu_sw_netstats stats;
1713         struct nlattr *nest;
1714
1715         nest = nla_nest_start(skb, BRIDGE_VLANDB_ENTRY_STATS);
1716         if (!nest)
1717                 return false;
1718
1719         br_vlan_get_stats(v, &stats);
1720         if (nla_put_u64_64bit(skb, BRIDGE_VLANDB_STATS_RX_BYTES, stats.rx_bytes,
1721                               BRIDGE_VLANDB_STATS_PAD) ||
1722             nla_put_u64_64bit(skb, BRIDGE_VLANDB_STATS_RX_PACKETS,
1723                               stats.rx_packets, BRIDGE_VLANDB_STATS_PAD) ||
1724             nla_put_u64_64bit(skb, BRIDGE_VLANDB_STATS_TX_BYTES, stats.tx_bytes,
1725                               BRIDGE_VLANDB_STATS_PAD) ||
1726             nla_put_u64_64bit(skb, BRIDGE_VLANDB_STATS_TX_PACKETS,
1727                               stats.tx_packets, BRIDGE_VLANDB_STATS_PAD))
1728                 goto out_err;
1729
1730         nla_nest_end(skb, nest);
1731
1732         return true;
1733
1734 out_err:
1735         nla_nest_cancel(skb, nest);
1736         return false;
1737 }
1738
1739 /* v_opts is used to dump the options which must be equal in the whole range */
1740 static bool br_vlan_fill_vids(struct sk_buff *skb, u16 vid, u16 vid_range,
1741                               const struct net_bridge_vlan *v_opts,
1742                               u16 flags,
1743                               bool dump_stats)
1744 {
1745         struct bridge_vlan_info info;
1746         struct nlattr *nest;
1747
1748         nest = nla_nest_start(skb, BRIDGE_VLANDB_ENTRY);
1749         if (!nest)
1750                 return false;
1751
1752         memset(&info, 0, sizeof(info));
1753         info.vid = vid;
1754         if (flags & BRIDGE_VLAN_INFO_UNTAGGED)
1755                 info.flags |= BRIDGE_VLAN_INFO_UNTAGGED;
1756         if (flags & BRIDGE_VLAN_INFO_PVID)
1757                 info.flags |= BRIDGE_VLAN_INFO_PVID;
1758
1759         if (nla_put(skb, BRIDGE_VLANDB_ENTRY_INFO, sizeof(info), &info))
1760                 goto out_err;
1761
1762         if (vid_range && vid < vid_range &&
1763             !(flags & BRIDGE_VLAN_INFO_PVID) &&
1764             nla_put_u16(skb, BRIDGE_VLANDB_ENTRY_RANGE, vid_range))
1765                 goto out_err;
1766
1767         if (v_opts) {
1768                 if (!br_vlan_opts_fill(skb, v_opts))
1769                         goto out_err;
1770
1771                 if (dump_stats && !br_vlan_stats_fill(skb, v_opts))
1772                         goto out_err;
1773         }
1774
1775         nla_nest_end(skb, nest);
1776
1777         return true;
1778
1779 out_err:
1780         nla_nest_cancel(skb, nest);
1781         return false;
1782 }
1783
1784 static size_t rtnl_vlan_nlmsg_size(void)
1785 {
1786         return NLMSG_ALIGN(sizeof(struct br_vlan_msg))
1787                 + nla_total_size(0) /* BRIDGE_VLANDB_ENTRY */
1788                 + nla_total_size(sizeof(u16)) /* BRIDGE_VLANDB_ENTRY_RANGE */
1789                 + nla_total_size(sizeof(struct bridge_vlan_info)) /* BRIDGE_VLANDB_ENTRY_INFO */
1790                 + br_vlan_opts_nl_size(); /* bridge vlan options */
1791 }
1792
1793 void br_vlan_notify(const struct net_bridge *br,
1794                     const struct net_bridge_port *p,
1795                     u16 vid, u16 vid_range,
1796                     int cmd)
1797 {
1798         struct net_bridge_vlan_group *vg;
1799         struct net_bridge_vlan *v = NULL;
1800         struct br_vlan_msg *bvm;
1801         struct nlmsghdr *nlh;
1802         struct sk_buff *skb;
1803         int err = -ENOBUFS;
1804         struct net *net;
1805         u16 flags = 0;
1806         int ifindex;
1807
1808         /* right now notifications are done only with rtnl held */
1809         ASSERT_RTNL();
1810
1811         if (p) {
1812                 ifindex = p->dev->ifindex;
1813                 vg = nbp_vlan_group(p);
1814                 net = dev_net(p->dev);
1815         } else {
1816                 ifindex = br->dev->ifindex;
1817                 vg = br_vlan_group(br);
1818                 net = dev_net(br->dev);
1819         }
1820
1821         skb = nlmsg_new(rtnl_vlan_nlmsg_size(), GFP_KERNEL);
1822         if (!skb)
1823                 goto out_err;
1824
1825         err = -EMSGSIZE;
1826         nlh = nlmsg_put(skb, 0, 0, cmd, sizeof(*bvm), 0);
1827         if (!nlh)
1828                 goto out_err;
1829         bvm = nlmsg_data(nlh);
1830         memset(bvm, 0, sizeof(*bvm));
1831         bvm->family = AF_BRIDGE;
1832         bvm->ifindex = ifindex;
1833
1834         switch (cmd) {
1835         case RTM_NEWVLAN:
1836                 /* need to find the vlan due to flags/options */
1837                 v = br_vlan_find(vg, vid);
1838                 if (!v || !br_vlan_should_use(v))
1839                         goto out_kfree;
1840
1841                 flags = v->flags;
1842                 if (br_get_pvid(vg) == v->vid)
1843                         flags |= BRIDGE_VLAN_INFO_PVID;
1844                 break;
1845         case RTM_DELVLAN:
1846                 break;
1847         default:
1848                 goto out_kfree;
1849         }
1850
1851         if (!br_vlan_fill_vids(skb, vid, vid_range, v, flags, false))
1852                 goto out_err;
1853
1854         nlmsg_end(skb, nlh);
1855         rtnl_notify(skb, net, 0, RTNLGRP_BRVLAN, NULL, GFP_KERNEL);
1856         return;
1857
1858 out_err:
1859         rtnl_set_sk_err(net, RTNLGRP_BRVLAN, err);
1860 out_kfree:
1861         kfree_skb(skb);
1862 }
1863
1864 static int br_vlan_replay_one(struct notifier_block *nb,
1865                               struct net_device *dev,
1866                               struct switchdev_obj_port_vlan *vlan,
1867                               const void *ctx, unsigned long action,
1868                               struct netlink_ext_ack *extack)
1869 {
1870         struct switchdev_notifier_port_obj_info obj_info = {
1871                 .info = {
1872                         .dev = dev,
1873                         .extack = extack,
1874                         .ctx = ctx,
1875                 },
1876                 .obj = &vlan->obj,
1877         };
1878         int err;
1879
1880         err = nb->notifier_call(nb, action, &obj_info);
1881         return notifier_to_errno(err);
1882 }
1883
1884 int br_vlan_replay(struct net_device *br_dev, struct net_device *dev,
1885                    const void *ctx, bool adding, struct notifier_block *nb,
1886                    struct netlink_ext_ack *extack)
1887 {
1888         struct net_bridge_vlan_group *vg;
1889         struct net_bridge_vlan *v;
1890         struct net_bridge_port *p;
1891         struct net_bridge *br;
1892         unsigned long action;
1893         int err = 0;
1894         u16 pvid;
1895
1896         ASSERT_RTNL();
1897
1898         if (!nb)
1899                 return 0;
1900
1901         if (!netif_is_bridge_master(br_dev))
1902                 return -EINVAL;
1903
1904         if (!netif_is_bridge_master(dev) && !netif_is_bridge_port(dev))
1905                 return -EINVAL;
1906
1907         if (netif_is_bridge_master(dev)) {
1908                 br = netdev_priv(dev);
1909                 vg = br_vlan_group(br);
1910                 p = NULL;
1911         } else {
1912                 p = br_port_get_rtnl(dev);
1913                 if (WARN_ON(!p))
1914                         return -EINVAL;
1915                 vg = nbp_vlan_group(p);
1916                 br = p->br;
1917         }
1918
1919         if (!vg)
1920                 return 0;
1921
1922         if (adding)
1923                 action = SWITCHDEV_PORT_OBJ_ADD;
1924         else
1925                 action = SWITCHDEV_PORT_OBJ_DEL;
1926
1927         pvid = br_get_pvid(vg);
1928
1929         list_for_each_entry(v, &vg->vlan_list, vlist) {
1930                 struct switchdev_obj_port_vlan vlan = {
1931                         .obj.orig_dev = dev,
1932                         .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
1933                         .flags = br_vlan_flags(v, pvid),
1934                         .vid = v->vid,
1935                 };
1936
1937                 if (!br_vlan_should_use(v))
1938                         continue;
1939
1940                 err = br_vlan_replay_one(nb, dev, &vlan, ctx, action, extack);
1941                 if (err)
1942                         return err;
1943         }
1944
1945         return err;
1946 }
1947
1948 /* check if v_curr can enter a range ending in range_end */
1949 bool br_vlan_can_enter_range(const struct net_bridge_vlan *v_curr,
1950                              const struct net_bridge_vlan *range_end)
1951 {
1952         return v_curr->vid - range_end->vid == 1 &&
1953                range_end->flags == v_curr->flags &&
1954                br_vlan_opts_eq_range(v_curr, range_end);
1955 }
1956
1957 static int br_vlan_dump_dev(const struct net_device *dev,
1958                             struct sk_buff *skb,
1959                             struct netlink_callback *cb,
1960                             u32 dump_flags)
1961 {
1962         struct net_bridge_vlan *v, *range_start = NULL, *range_end = NULL;
1963         bool dump_global = !!(dump_flags & BRIDGE_VLANDB_DUMPF_GLOBAL);
1964         bool dump_stats = !!(dump_flags & BRIDGE_VLANDB_DUMPF_STATS);
1965         struct net_bridge_vlan_group *vg;
1966         int idx = 0, s_idx = cb->args[1];
1967         struct nlmsghdr *nlh = NULL;
1968         struct net_bridge_port *p;
1969         struct br_vlan_msg *bvm;
1970         struct net_bridge *br;
1971         int err = 0;
1972         u16 pvid;
1973
1974         if (!netif_is_bridge_master(dev) && !netif_is_bridge_port(dev))
1975                 return -EINVAL;
1976
1977         if (netif_is_bridge_master(dev)) {
1978                 br = netdev_priv(dev);
1979                 vg = br_vlan_group_rcu(br);
1980                 p = NULL;
1981         } else {
1982                 /* global options are dumped only for bridge devices */
1983                 if (dump_global)
1984                         return 0;
1985
1986                 p = br_port_get_rcu(dev);
1987                 if (WARN_ON(!p))
1988                         return -EINVAL;
1989                 vg = nbp_vlan_group_rcu(p);
1990                 br = p->br;
1991         }
1992
1993         if (!vg)
1994                 return 0;
1995
1996         nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1997                         RTM_NEWVLAN, sizeof(*bvm), NLM_F_MULTI);
1998         if (!nlh)
1999                 return -EMSGSIZE;
2000         bvm = nlmsg_data(nlh);
2001         memset(bvm, 0, sizeof(*bvm));
2002         bvm->family = PF_BRIDGE;
2003         bvm->ifindex = dev->ifindex;
2004         pvid = br_get_pvid(vg);
2005
2006         /* idx must stay at range's beginning until it is filled in */
2007         list_for_each_entry_rcu(v, &vg->vlan_list, vlist) {
2008                 if (!dump_global && !br_vlan_should_use(v))
2009                         continue;
2010                 if (idx < s_idx) {
2011                         idx++;
2012                         continue;
2013                 }
2014
2015                 if (!range_start) {
2016                         range_start = v;
2017                         range_end = v;
2018                         continue;
2019                 }
2020
2021                 if (dump_global) {
2022                         if (br_vlan_global_opts_can_enter_range(v, range_end))
2023                                 goto update_end;
2024                         if (!br_vlan_global_opts_fill(skb, range_start->vid,
2025                                                       range_end->vid,
2026                                                       range_start)) {
2027                                 err = -EMSGSIZE;
2028                                 break;
2029                         }
2030                         /* advance number of filled vlans */
2031                         idx += range_end->vid - range_start->vid + 1;
2032
2033                         range_start = v;
2034                 } else if (dump_stats || v->vid == pvid ||
2035                            !br_vlan_can_enter_range(v, range_end)) {
2036                         u16 vlan_flags = br_vlan_flags(range_start, pvid);
2037
2038                         if (!br_vlan_fill_vids(skb, range_start->vid,
2039                                                range_end->vid, range_start,
2040                                                vlan_flags, dump_stats)) {
2041                                 err = -EMSGSIZE;
2042                                 break;
2043                         }
2044                         /* advance number of filled vlans */
2045                         idx += range_end->vid - range_start->vid + 1;
2046
2047                         range_start = v;
2048                 }
2049 update_end:
2050                 range_end = v;
2051         }
2052
2053         /* err will be 0 and range_start will be set in 3 cases here:
2054          * - first vlan (range_start == range_end)
2055          * - last vlan (range_start == range_end, not in range)
2056          * - last vlan range (range_start != range_end, in range)
2057          */
2058         if (!err && range_start) {
2059                 if (dump_global &&
2060                     !br_vlan_global_opts_fill(skb, range_start->vid,
2061                                               range_end->vid, range_start))
2062                         err = -EMSGSIZE;
2063                 else if (!dump_global &&
2064                          !br_vlan_fill_vids(skb, range_start->vid,
2065                                             range_end->vid, range_start,
2066                                             br_vlan_flags(range_start, pvid),
2067                                             dump_stats))
2068                         err = -EMSGSIZE;
2069         }
2070
2071         cb->args[1] = err ? idx : 0;
2072
2073         nlmsg_end(skb, nlh);
2074
2075         return err;
2076 }
2077
2078 static const struct nla_policy br_vlan_db_dump_pol[BRIDGE_VLANDB_DUMP_MAX + 1] = {
2079         [BRIDGE_VLANDB_DUMP_FLAGS] = { .type = NLA_U32 },
2080 };
2081
2082 static int br_vlan_rtm_dump(struct sk_buff *skb, struct netlink_callback *cb)
2083 {
2084         struct nlattr *dtb[BRIDGE_VLANDB_DUMP_MAX + 1];
2085         int idx = 0, err = 0, s_idx = cb->args[0];
2086         struct net *net = sock_net(skb->sk);
2087         struct br_vlan_msg *bvm;
2088         struct net_device *dev;
2089         u32 dump_flags = 0;
2090
2091         err = nlmsg_parse(cb->nlh, sizeof(*bvm), dtb, BRIDGE_VLANDB_DUMP_MAX,
2092                           br_vlan_db_dump_pol, cb->extack);
2093         if (err < 0)
2094                 return err;
2095
2096         bvm = nlmsg_data(cb->nlh);
2097         if (dtb[BRIDGE_VLANDB_DUMP_FLAGS])
2098                 dump_flags = nla_get_u32(dtb[BRIDGE_VLANDB_DUMP_FLAGS]);
2099
2100         rcu_read_lock();
2101         if (bvm->ifindex) {
2102                 dev = dev_get_by_index_rcu(net, bvm->ifindex);
2103                 if (!dev) {
2104                         err = -ENODEV;
2105                         goto out_err;
2106                 }
2107                 err = br_vlan_dump_dev(dev, skb, cb, dump_flags);
2108                 if (err && err != -EMSGSIZE)
2109                         goto out_err;
2110         } else {
2111                 for_each_netdev_rcu(net, dev) {
2112                         if (idx < s_idx)
2113                                 goto skip;
2114
2115                         err = br_vlan_dump_dev(dev, skb, cb, dump_flags);
2116                         if (err == -EMSGSIZE)
2117                                 break;
2118 skip:
2119                         idx++;
2120                 }
2121         }
2122         cb->args[0] = idx;
2123         rcu_read_unlock();
2124
2125         return skb->len;
2126
2127 out_err:
2128         rcu_read_unlock();
2129
2130         return err;
2131 }
2132
2133 static const struct nla_policy br_vlan_db_policy[BRIDGE_VLANDB_ENTRY_MAX + 1] = {
2134         [BRIDGE_VLANDB_ENTRY_INFO]      =
2135                 NLA_POLICY_EXACT_LEN(sizeof(struct bridge_vlan_info)),
2136         [BRIDGE_VLANDB_ENTRY_RANGE]     = { .type = NLA_U16 },
2137         [BRIDGE_VLANDB_ENTRY_STATE]     = { .type = NLA_U8 },
2138         [BRIDGE_VLANDB_ENTRY_TUNNEL_INFO] = { .type = NLA_NESTED },
2139         [BRIDGE_VLANDB_ENTRY_MCAST_ROUTER]      = { .type = NLA_U8 },
2140 };
2141
2142 static int br_vlan_rtm_process_one(struct net_device *dev,
2143                                    const struct nlattr *attr,
2144                                    int cmd, struct netlink_ext_ack *extack)
2145 {
2146         struct bridge_vlan_info *vinfo, vrange_end, *vinfo_last = NULL;
2147         struct nlattr *tb[BRIDGE_VLANDB_ENTRY_MAX + 1];
2148         bool changed = false, skip_processing = false;
2149         struct net_bridge_vlan_group *vg;
2150         struct net_bridge_port *p = NULL;
2151         int err = 0, cmdmap = 0;
2152         struct net_bridge *br;
2153
2154         if (netif_is_bridge_master(dev)) {
2155                 br = netdev_priv(dev);
2156                 vg = br_vlan_group(br);
2157         } else {
2158                 p = br_port_get_rtnl(dev);
2159                 if (WARN_ON(!p))
2160                         return -ENODEV;
2161                 br = p->br;
2162                 vg = nbp_vlan_group(p);
2163         }
2164
2165         if (WARN_ON(!vg))
2166                 return -ENODEV;
2167
2168         err = nla_parse_nested(tb, BRIDGE_VLANDB_ENTRY_MAX, attr,
2169                                br_vlan_db_policy, extack);
2170         if (err)
2171                 return err;
2172
2173         if (!tb[BRIDGE_VLANDB_ENTRY_INFO]) {
2174                 NL_SET_ERR_MSG_MOD(extack, "Missing vlan entry info");
2175                 return -EINVAL;
2176         }
2177         memset(&vrange_end, 0, sizeof(vrange_end));
2178
2179         vinfo = nla_data(tb[BRIDGE_VLANDB_ENTRY_INFO]);
2180         if (vinfo->flags & (BRIDGE_VLAN_INFO_RANGE_BEGIN |
2181                             BRIDGE_VLAN_INFO_RANGE_END)) {
2182                 NL_SET_ERR_MSG_MOD(extack, "Old-style vlan ranges are not allowed when using RTM vlan calls");
2183                 return -EINVAL;
2184         }
2185         if (!br_vlan_valid_id(vinfo->vid, extack))
2186                 return -EINVAL;
2187
2188         if (tb[BRIDGE_VLANDB_ENTRY_RANGE]) {
2189                 vrange_end.vid = nla_get_u16(tb[BRIDGE_VLANDB_ENTRY_RANGE]);
2190                 /* validate user-provided flags without RANGE_BEGIN */
2191                 vrange_end.flags = BRIDGE_VLAN_INFO_RANGE_END | vinfo->flags;
2192                 vinfo->flags |= BRIDGE_VLAN_INFO_RANGE_BEGIN;
2193
2194                 /* vinfo_last is the range start, vinfo the range end */
2195                 vinfo_last = vinfo;
2196                 vinfo = &vrange_end;
2197
2198                 if (!br_vlan_valid_id(vinfo->vid, extack) ||
2199                     !br_vlan_valid_range(vinfo, vinfo_last, extack))
2200                         return -EINVAL;
2201         }
2202
2203         switch (cmd) {
2204         case RTM_NEWVLAN:
2205                 cmdmap = RTM_SETLINK;
2206                 skip_processing = !!(vinfo->flags & BRIDGE_VLAN_INFO_ONLY_OPTS);
2207                 break;
2208         case RTM_DELVLAN:
2209                 cmdmap = RTM_DELLINK;
2210                 break;
2211         }
2212
2213         if (!skip_processing) {
2214                 struct bridge_vlan_info *tmp_last = vinfo_last;
2215
2216                 /* br_process_vlan_info may overwrite vinfo_last */
2217                 err = br_process_vlan_info(br, p, cmdmap, vinfo, &tmp_last,
2218                                            &changed, extack);
2219
2220                 /* notify first if anything changed */
2221                 if (changed)
2222                         br_ifinfo_notify(cmdmap, br, p);
2223
2224                 if (err)
2225                         return err;
2226         }
2227
2228         /* deal with options */
2229         if (cmd == RTM_NEWVLAN) {
2230                 struct net_bridge_vlan *range_start, *range_end;
2231
2232                 if (vinfo_last) {
2233                         range_start = br_vlan_find(vg, vinfo_last->vid);
2234                         range_end = br_vlan_find(vg, vinfo->vid);
2235                 } else {
2236                         range_start = br_vlan_find(vg, vinfo->vid);
2237                         range_end = range_start;
2238                 }
2239
2240                 err = br_vlan_process_options(br, p, range_start, range_end,
2241                                               tb, extack);
2242         }
2243
2244         return err;
2245 }
2246
2247 static int br_vlan_rtm_process(struct sk_buff *skb, struct nlmsghdr *nlh,
2248                                struct netlink_ext_ack *extack)
2249 {
2250         struct net *net = sock_net(skb->sk);
2251         struct br_vlan_msg *bvm;
2252         struct net_device *dev;
2253         struct nlattr *attr;
2254         int err, vlans = 0;
2255         int rem;
2256
2257         /* this should validate the header and check for remaining bytes */
2258         err = nlmsg_parse(nlh, sizeof(*bvm), NULL, BRIDGE_VLANDB_MAX, NULL,
2259                           extack);
2260         if (err < 0)
2261                 return err;
2262
2263         bvm = nlmsg_data(nlh);
2264         dev = __dev_get_by_index(net, bvm->ifindex);
2265         if (!dev)
2266                 return -ENODEV;
2267
2268         if (!netif_is_bridge_master(dev) && !netif_is_bridge_port(dev)) {
2269                 NL_SET_ERR_MSG_MOD(extack, "The device is not a valid bridge or bridge port");
2270                 return -EINVAL;
2271         }
2272
2273         nlmsg_for_each_attr(attr, nlh, sizeof(*bvm), rem) {
2274                 switch (nla_type(attr)) {
2275                 case BRIDGE_VLANDB_ENTRY:
2276                         err = br_vlan_rtm_process_one(dev, attr,
2277                                                       nlh->nlmsg_type,
2278                                                       extack);
2279                         break;
2280                 case BRIDGE_VLANDB_GLOBAL_OPTIONS:
2281                         err = br_vlan_rtm_process_global_options(dev, attr,
2282                                                                  nlh->nlmsg_type,
2283                                                                  extack);
2284                         break;
2285                 default:
2286                         continue;
2287                 }
2288
2289                 vlans++;
2290                 if (err)
2291                         break;
2292         }
2293         if (!vlans) {
2294                 NL_SET_ERR_MSG_MOD(extack, "No vlans found to process");
2295                 err = -EINVAL;
2296         }
2297
2298         return err;
2299 }
2300
2301 void br_vlan_rtnl_init(void)
2302 {
2303         rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_GETVLAN, NULL,
2304                              br_vlan_rtm_dump, 0);
2305         rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_NEWVLAN,
2306                              br_vlan_rtm_process, NULL, 0);
2307         rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_DELVLAN,
2308                              br_vlan_rtm_process, NULL, 0);
2309 }
2310
2311 void br_vlan_rtnl_uninit(void)
2312 {
2313         rtnl_unregister(PF_BRIDGE, RTM_GETVLAN);
2314         rtnl_unregister(PF_BRIDGE, RTM_NEWVLAN);
2315         rtnl_unregister(PF_BRIDGE, RTM_DELVLAN);
2316 }