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