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                         continue;
 118                 else
 119                         break;
 120         }
 121         list_add_rcu(&v->vlist, hpos);
 122 }
 123
 124 static void __vlan_del_list(struct net_bridge_vlan *v)
 125 {
 126         list_del_rcu(&v->vlist);
 127 }
 128
 129 static int __vlan_vid_del(struct net_device *dev, struct net_bridge *br,
 130                           const struct net_bridge_vlan *v)
 131 {
 132         int err;
 133
 134         /* Try switchdev op first. In case it is not supported, fallback to
 135          * 8021q del.
 136          */
 137         err = br_switchdev_port_vlan_del(dev, v->vid);
 138         if (!(v->priv_flags & BR_VLFLAG_ADDED_BY_SWITCHDEV))
 139                 vlan_vid_del(dev, br->vlan_proto, v->vid);
 140         return err == -EOPNOTSUPP ? 0 : err;
 141 }
 142
 143 /* Returns a master vlan, if it didn't exist it gets created. In all cases
 144  * a reference is taken to the master vlan before returning.
 145  */
 146 static struct net_bridge_vlan *
 147 br_vlan_get_master(struct net_bridge *br, u16 vid,
 148                    struct netlink_ext_ack *extack)
 149 {
 150         struct net_bridge_vlan_group *vg;
 151         struct net_bridge_vlan *masterv;
 152
 153         vg = br_vlan_group(br);
 154         masterv = br_vlan_find(vg, vid);
 155         if (!masterv) {
 156                 bool changed;
 157
 158                 /* missing global ctx, create it now */
 159                 if (br_vlan_add(br, vid, 0, &changed, extack))
 160                         return NULL;
 161                 masterv = br_vlan_find(vg, vid);
 162                 if (WARN_ON(!masterv))
 163                         return NULL;
 164                 refcount_set(&masterv->refcnt, 1);
 165                 return masterv;
 166         }
 167         refcount_inc(&masterv->refcnt);
 168
 169         return masterv;
 170 }
 171
 172 static void br_master_vlan_rcu_free(struct rcu_head *rcu)
 173 {
 174         struct net_bridge_vlan *v;
 175
 176         v = container_of(rcu, struct net_bridge_vlan, rcu);
 177         WARN_ON(!br_vlan_is_master(v));
 178         free_percpu(v->stats);
 179         v->stats = NULL;
 180         kfree(v);
 181 }
 182
 183 static void br_vlan_put_master(struct net_bridge_vlan *masterv)
 184 {
 185         struct net_bridge_vlan_group *vg;
 186
 187         if (!br_vlan_is_master(masterv))
 188                 return;
 189
 190         vg = br_vlan_group(masterv->br);
 191         if (refcount_dec_and_test(&masterv->refcnt)) {
 192                 rhashtable_remove_fast(&vg->vlan_hash,
 193                                        &masterv->vnode, br_vlan_rht_params);
 194                 __vlan_del_list(masterv);
 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                         goto out_filt;
 271                 v->brvlan = masterv;
 272                 if (br_opt_get(br, BROPT_VLAN_STATS_PER_PORT)) {
 273                         v->stats =
 274                              netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
 275                         if (!v->stats) {
 276                                 err = -ENOMEM;
 277                                 goto out_filt;
 278                         }
 279                         v->priv_flags |= BR_VLFLAG_PER_PORT_STATS;
 280                 } else {
 281                         v->stats = masterv->stats;
 282                 }
 283         } else {
 284                 err = br_switchdev_port_vlan_add(dev, v->vid, flags, extack);
 285                 if (err && err != -EOPNOTSUPP)
 286                         goto out;
 287         }
 288
 289         /* Add the dev mac and count the vlan only if it's usable */
 290         if (br_vlan_should_use(v)) {
 291                 err = br_fdb_insert(br, p, dev->dev_addr, v->vid);
 292                 if (err) {
 293                         br_err(br, "failed insert local address into bridge forwarding table\n");
 294                         goto out_filt;
 295                 }
 296                 vg->num_vlans++;
 297         }
 298
 299         /* set the state before publishing */
 300         v->state = BR_STATE_FORWARDING;
 301
 302         err = rhashtable_lookup_insert_fast(&vg->vlan_hash, &v->vnode,
 303                                             br_vlan_rht_params);
 304         if (err)
 305                 goto out_fdb_insert;
 306
 307         __vlan_add_list(v);
 308         __vlan_add_flags(v, flags);
 309
 310         if (p)
 311                 nbp_vlan_set_vlan_dev_state(p, v->vid);
 312 out:
 313         return err;
 314
 315 out_fdb_insert:
 316         if (br_vlan_should_use(v)) {
 317                 br_fdb_find_delete_local(br, p, dev->dev_addr, v->vid);
 318                 vg->num_vlans--;
 319         }
 320
 321 out_filt:
 322         if (p) {
 323                 __vlan_vid_del(dev, br, v);
 324                 if (masterv) {
 325                         if (v->stats && masterv->stats != v->stats)
 326                                 free_percpu(v->stats);
 327                         v->stats = NULL;
 328
 329                         br_vlan_put_master(masterv);
 330                         v->brvlan = NULL;
 331                 }
 332         } else {
 333                 br_switchdev_port_vlan_del(dev, v->vid);
 334         }
 335
 336         goto out;
 337 }
 338
 339 static int __vlan_del(struct net_bridge_vlan *v)
 340 {
 341         struct net_bridge_vlan *masterv = v;
 342         struct net_bridge_vlan_group *vg;
 343         struct net_bridge_port *p = NULL;
 344         int err = 0;
 345
 346         if (br_vlan_is_master(v)) {
 347                 vg = br_vlan_group(v->br);
 348         } else {
 349                 p = v->port;
 350                 vg = nbp_vlan_group(v->port);
 351                 masterv = v->brvlan;
 352         }
 353
 354         __vlan_delete_pvid(vg, v->vid);
 355         if (p) {
 356                 err = __vlan_vid_del(p->dev, p->br, v);
 357                 if (err)
 358                         goto out;
 359         } else {
 360                 err = br_switchdev_port_vlan_del(v->br->dev, v->vid);
 361                 if (err && err != -EOPNOTSUPP)
 362                         goto out;
 363                 err = 0;
 364         }
 365
 366         if (br_vlan_should_use(v)) {
 367                 v->flags &= ~BRIDGE_VLAN_INFO_BRENTRY;
 368                 vg->num_vlans--;
 369         }
 370
 371         if (masterv != v) {
 372                 vlan_tunnel_info_del(vg, v);
 373                 rhashtable_remove_fast(&vg->vlan_hash, &v->vnode,
 374                                        br_vlan_rht_params);
 375                 __vlan_del_list(v);
 376                 nbp_vlan_set_vlan_dev_state(p, v->vid);
 377                 call_rcu(&v->rcu, nbp_vlan_rcu_free);
 378         }
 379
 380         br_vlan_put_master(masterv);
 381 out:
 382         return err;
 383 }
 384
 385 static void __vlan_group_free(struct net_bridge_vlan_group *vg)
 386 {
 387         WARN_ON(!list_empty(&vg->vlan_list));
 388         rhashtable_destroy(&vg->vlan_hash);
 389         vlan_tunnel_deinit(vg);
 390         kfree(vg);
 391 }
 392
 393 static void __vlan_flush(const struct net_bridge *br,
 394                          const struct net_bridge_port *p,
 395                          struct net_bridge_vlan_group *vg)
 396 {
 397         struct net_bridge_vlan *vlan, *tmp;
 398         u16 v_start = 0, v_end = 0;
 399
 400         __vlan_delete_pvid(vg, vg->pvid);
 401         list_for_each_entry_safe(vlan, tmp, &vg->vlan_list, vlist) {
 402                 /* take care of disjoint ranges */
 403                 if (!v_start) {
 404                         v_start = vlan->vid;
 405                 } else if (vlan->vid - v_end != 1) {
 406                         /* found range end, notify and start next one */
 407                         br_vlan_notify(br, p, v_start, v_end, RTM_DELVLAN);
 408                         v_start = vlan->vid;
 409                 }
 410                 v_end = vlan->vid;
 411
 412                 __vlan_del(vlan);
 413         }
 414
 415         /* notify about the last/whole vlan range */
 416         if (v_start)
 417                 br_vlan_notify(br, p, v_start, v_end, RTM_DELVLAN);
 418 }
 419
 420 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 421                                const struct net_bridge_port *p,
 422                                struct net_bridge_vlan_group *vg,
 423                                struct sk_buff *skb)
 424 {
 425         struct pcpu_sw_netstats *stats;
 426         struct net_bridge_vlan *v;
 427         u16 vid;
 428
 429         /* If this packet was not filtered at input, let it pass */
 430         if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
 431                 goto out;
 432
 433         /* At this point, we know that the frame was filtered and contains
 434          * a valid vlan id.  If the vlan id has untagged flag set,
 435          * send untagged; otherwise, send tagged.
 436          */
 437         br_vlan_get_tag(skb, &vid);
 438         v = br_vlan_find(vg, vid);
 439         /* Vlan entry must be configured at this point.  The
 440          * only exception is the bridge is set in promisc mode and the
 441          * packet is destined for the bridge device.  In this case
 442          * pass the packet as is.
 443          */
 444         if (!v || !br_vlan_should_use(v)) {
 445                 if ((br->dev->flags & IFF_PROMISC) && skb->dev == br->dev) {
 446                         goto out;
 447                 } else {
 448                         kfree_skb(skb);
 449                         return NULL;
 450                 }
 451         }
 452         if (br_opt_get(br, BROPT_VLAN_STATS_ENABLED)) {
 453                 stats = this_cpu_ptr(v->stats);
 454                 u64_stats_update_begin(&stats->syncp);
 455                 stats->tx_bytes += skb->len;
 456                 stats->tx_packets++;
 457                 u64_stats_update_end(&stats->syncp);
 458         }
 459
 460         if (v->flags & BRIDGE_VLAN_INFO_UNTAGGED)
 461                 __vlan_hwaccel_clear_tag(skb);
 462
 463         if (p && (p->flags & BR_VLAN_TUNNEL) &&
 464             br_handle_egress_vlan_tunnel(skb, v)) {
 465                 kfree_skb(skb);
 466                 return NULL;
 467         }
 468 out:
 469         return skb;
 470 }
 471
 472 /* Called under RCU */
 473 static bool __allowed_ingress(const struct net_bridge *br,
 474                               struct net_bridge_vlan_group *vg,
 475                               struct sk_buff *skb, u16 *vid,
 476                               u8 *state)
 477 {
 478         struct pcpu_sw_netstats *stats;
 479         struct net_bridge_vlan *v;
 480         bool tagged;
 481
 482         BR_INPUT_SKB_CB(skb)->vlan_filtered = true;
 483         /* If vlan tx offload is disabled on bridge device and frame was
 484          * sent from vlan device on the bridge device, it does not have
 485          * HW accelerated vlan tag.
 486          */
 487         if (unlikely(!skb_vlan_tag_present(skb) &&
 488                      skb->protocol == br->vlan_proto)) {
 489                 skb = skb_vlan_untag(skb);
 490                 if (unlikely(!skb))
 491                         return false;
 492         }
 493
 494         if (!br_vlan_get_tag(skb, vid)) {
 495                 /* Tagged frame */
 496                 if (skb->vlan_proto != br->vlan_proto) {
 497                         /* Protocol-mismatch, empty out vlan_tci for new tag */
 498                         skb_push(skb, ETH_HLEN);
 499                         skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto,
 500                                                         skb_vlan_tag_get(skb));
 501                         if (unlikely(!skb))
 502                                 return false;
 503
 504                         skb_pull(skb, ETH_HLEN);
 505                         skb_reset_mac_len(skb);
 506                         *vid = 0;
 507                         tagged = false;
 508                 } else {
 509                         tagged = true;
 510                 }
 511         } else {
 512                 /* Untagged frame */
 513                 tagged = false;
 514         }
 515
 516         if (!*vid) {
 517                 u16 pvid = br_get_pvid(vg);
 518
 519                 /* Frame had a tag with VID 0 or did not have a tag.
 520                  * See if pvid is set on this port.  That tells us which
 521                  * vlan untagged or priority-tagged traffic belongs to.
 522                  */
 523                 if (!pvid)
 524                         goto drop;
 525
 526                 /* PVID is set on this port.  Any untagged or priority-tagged
 527                  * ingress frame is considered to belong to this vlan.
 528                  */
 529                 *vid = pvid;
 530                 if (likely(!tagged))
 531                         /* Untagged Frame. */
 532                         __vlan_hwaccel_put_tag(skb, br->vlan_proto, pvid);
 533                 else
 534                         /* Priority-tagged Frame.
 535                          * At this point, we know that skb->vlan_tci VID
 536                          * field was 0.
 537                          * We update only VID field and preserve PCP field.
 538                          */
 539                         skb->vlan_tci |= pvid;
 540
 541                 /* if stats are disabled we can avoid the lookup */
 542                 if (!br_opt_get(br, BROPT_VLAN_STATS_ENABLED)) {
 543                         if (*state == BR_STATE_FORWARDING) {
 544                                 *state = br_vlan_get_pvid_state(vg);
 545                                 return br_vlan_state_allowed(*state, true);
 546                         } else {
 547                                 return true;
 548                         }
 549                 }
 550         }
 551         v = br_vlan_find(vg, *vid);
 552         if (!v || !br_vlan_should_use(v))
 553                 goto drop;
 554
 555         if (*state == BR_STATE_FORWARDING) {
 556                 *state = br_vlan_get_state(v);
 557                 if (!br_vlan_state_allowed(*state, true))
 558                         goto drop;
 559         }
 560
 561         if (br_opt_get(br, BROPT_VLAN_STATS_ENABLED)) {
 562                 stats = this_cpu_ptr(v->stats);
 563                 u64_stats_update_begin(&stats->syncp);
 564                 stats->rx_bytes += skb->len;
 565                 stats->rx_packets++;
 566                 u64_stats_update_end(&stats->syncp);
 567         }
 568
 569         return true;
 570
 571 drop:
 572         kfree_skb(skb);
 573         return false;
 574 }
 575
 576 bool br_allowed_ingress(const struct net_bridge *br,
 577                         struct net_bridge_vlan_group *vg, struct sk_buff *skb,
 578                         u16 *vid, u8 *state)
 579 {
 580         /* If VLAN filtering is disabled on the bridge, all packets are
 581          * permitted.
 582          */
 583         if (!br_opt_get(br, BROPT_VLAN_ENABLED)) {
 584                 BR_INPUT_SKB_CB(skb)->vlan_filtered = false;
 585                 return true;
 586         }
 587
 588         return __allowed_ingress(br, vg, skb, vid, state);
 589 }
 590
 591 /* Called under RCU. */
 592 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 593                        const struct sk_buff *skb)
 594 {
 595         const struct net_bridge_vlan *v;
 596         u16 vid;
 597
 598         /* If this packet was not filtered at input, let it pass */
 599         if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
 600                 return true;
 601
 602         br_vlan_get_tag(skb, &vid);
 603         v = br_vlan_find(vg, vid);
 604         if (v && br_vlan_should_use(v) &&
 605             br_vlan_state_allowed(br_vlan_get_state(v), false))
 606                 return true;
 607
 608         return false;
 609 }
 610
 611 /* Called under RCU */
 612 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid)
 613 {
 614         struct net_bridge_vlan_group *vg;
 615         struct net_bridge *br = p->br;
 616         struct net_bridge_vlan *v;
 617
 618         /* If filtering was disabled at input, let it pass. */
 619         if (!br_opt_get(br, BROPT_VLAN_ENABLED))
 620                 return true;
 621
 622         vg = nbp_vlan_group_rcu(p);
 623         if (!vg || !vg->num_vlans)
 624                 return false;
 625
 626         if (!br_vlan_get_tag(skb, vid) && skb->vlan_proto != br->vlan_proto)
 627                 *vid = 0;
 628
 629         if (!*vid) {
 630                 *vid = br_get_pvid(vg);
 631                 if (!*vid ||
 632                     !br_vlan_state_allowed(br_vlan_get_pvid_state(vg), true))
 633                         return false;
 634
 635                 return true;
 636         }
 637
 638         v = br_vlan_find(vg, *vid);
 639         if (v && br_vlan_state_allowed(br_vlan_get_state(v), true))
 640                 return true;
 641
 642         return false;
 643 }
 644
 645 static int br_vlan_add_existing(struct net_bridge *br,
 646                                 struct net_bridge_vlan_group *vg,
 647                                 struct net_bridge_vlan *vlan,
 648                                 u16 flags, bool *changed,
 649                                 struct netlink_ext_ack *extack)
 650 {
 651         int err;
 652
 653         err = br_switchdev_port_vlan_add(br->dev, vlan->vid, flags, extack);
 654         if (err && err != -EOPNOTSUPP)
 655                 return err;
 656
 657         if (!br_vlan_is_brentry(vlan)) {
 658                 /* Trying to change flags of non-existent bridge vlan */
 659                 if (!(flags & BRIDGE_VLAN_INFO_BRENTRY)) {
 660                         err = -EINVAL;
 661                         goto err_flags;
 662                 }
 663                 /* It was only kept for port vlans, now make it real */
 664                 err = br_fdb_insert(br, NULL, br->dev->dev_addr,
 665                                     vlan->vid);
 666                 if (err) {
 667                         br_err(br, "failed to insert local address into bridge forwarding table\n");
 668                         goto err_fdb_insert;
 669                 }
 670
 671                 refcount_inc(&vlan->refcnt);
 672                 vlan->flags |= BRIDGE_VLAN_INFO_BRENTRY;
 673                 vg->num_vlans++;
 674                 *changed = true;
 675         }
 676
 677         if (__vlan_add_flags(vlan, flags))
 678                 *changed = true;
 679
 680         return 0;
 681
 682 err_fdb_insert:
 683 err_flags:
 684         br_switchdev_port_vlan_del(br->dev, vlan->vid);
 685         return err;
 686 }
 687
 688 /* Must be protected by RTNL.
 689  * Must be called with vid in range from 1 to 4094 inclusive.
 690  * changed must be true only if the vlan was created or updated
 691  */
 692 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, bool *changed,
 693                 struct netlink_ext_ack *extack)
 694 {
 695         struct net_bridge_vlan_group *vg;
 696         struct net_bridge_vlan *vlan;
 697         int ret;
 698
 699         ASSERT_RTNL();
 700
 701         *changed = false;
 702         vg = br_vlan_group(br);
 703         vlan = br_vlan_find(vg, vid);
 704         if (vlan)
 705                 return br_vlan_add_existing(br, vg, vlan, flags, changed,
 706                                             extack);
 707
 708         vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
 709         if (!vlan)
 710                 return -ENOMEM;
 711
 712         vlan->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
 713         if (!vlan->stats) {
 714                 kfree(vlan);
 715                 return -ENOMEM;
 716         }
 717         vlan->vid = vid;
 718         vlan->flags = flags | BRIDGE_VLAN_INFO_MASTER;
 719         vlan->flags &= ~BRIDGE_VLAN_INFO_PVID;
 720         vlan->br = br;
 721         if (flags & BRIDGE_VLAN_INFO_BRENTRY)
 722                 refcount_set(&vlan->refcnt, 1);
 723         ret = __vlan_add(vlan, flags, extack);
 724         if (ret) {
 725                 free_percpu(vlan->stats);
 726                 kfree(vlan);
 727         } else {
 728                 *changed = true;
 729         }
 730
 731         return ret;
 732 }
 733
 734 /* Must be protected by RTNL.
 735  * Must be called with vid in range from 1 to 4094 inclusive.
 736  */
 737 int br_vlan_delete(struct net_bridge *br, u16 vid)
 738 {
 739         struct net_bridge_vlan_group *vg;
 740         struct net_bridge_vlan *v;
 741
 742         ASSERT_RTNL();
 743
 744         vg = br_vlan_group(br);
 745         v = br_vlan_find(vg, vid);
 746         if (!v || !br_vlan_is_brentry(v))
 747                 return -ENOENT;
 748
 749         br_fdb_find_delete_local(br, NULL, br->dev->dev_addr, vid);
 750         br_fdb_delete_by_port(br, NULL, vid, 0);
 751
 752         vlan_tunnel_info_del(vg, v);
 753
 754         return __vlan_del(v);
 755 }
 756
 757 void br_vlan_flush(struct net_bridge *br)
 758 {
 759         struct net_bridge_vlan_group *vg;
 760
 761         ASSERT_RTNL();
 762
 763         vg = br_vlan_group(br);
 764         __vlan_flush(br, NULL, vg);
 765         RCU_INIT_POINTER(br->vlgrp, NULL);
 766         synchronize_rcu();
 767         __vlan_group_free(vg);
 768 }
 769
 770 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid)
 771 {
 772         if (!vg)
 773                 return NULL;
 774
 775         return br_vlan_lookup(&vg->vlan_hash, vid);
 776 }
 777
 778 /* Must be protected by RTNL. */
 779 static void recalculate_group_addr(struct net_bridge *br)
 780 {
 781         if (br_opt_get(br, BROPT_GROUP_ADDR_SET))
 782                 return;
 783
 784         spin_lock_bh(&br->lock);
 785         if (!br_opt_get(br, BROPT_VLAN_ENABLED) ||
 786             br->vlan_proto == htons(ETH_P_8021Q)) {
 787                 /* Bridge Group Address */
 788                 br->group_addr[5] = 0x00;
 789         } else { /* vlan_enabled && ETH_P_8021AD */
 790                 /* Provider Bridge Group Address */
 791                 br->group_addr[5] = 0x08;
 792         }
 793         spin_unlock_bh(&br->lock);
 794 }
 795
 796 /* Must be protected by RTNL. */
 797 void br_recalculate_fwd_mask(struct net_bridge *br)
 798 {
 799         if (!br_opt_get(br, BROPT_VLAN_ENABLED) ||
 800             br->vlan_proto == htons(ETH_P_8021Q))
 801                 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
 802         else /* vlan_enabled && ETH_P_8021AD */
 803                 br->group_fwd_mask_required = BR_GROUPFWD_8021AD &
 804                                               ~(1u << br->group_addr[5]);
 805 }
 806
 807 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
 808 {
 809         struct switchdev_attr attr = {
 810                 .orig_dev = br->dev,
 811                 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
 812                 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
 813                 .u.vlan_filtering = val,
 814         };
 815         int err;
 816
 817         if (br_opt_get(br, BROPT_VLAN_ENABLED) == !!val)
 818                 return 0;
 819
 820         err = switchdev_port_attr_set(br->dev, &attr);
 821         if (err && err != -EOPNOTSUPP)
 822                 return err;
 823
 824         br_opt_toggle(br, BROPT_VLAN_ENABLED, !!val);
 825         br_manage_promisc(br);
 826         recalculate_group_addr(br);
 827         br_recalculate_fwd_mask(br);
 828
 829         return 0;
 830 }
 831
 832 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
 833 {
 834         return __br_vlan_filter_toggle(br, val);
 835 }
 836
 837 bool br_vlan_enabled(const struct net_device *dev)
 838 {
 839         struct net_bridge *br = netdev_priv(dev);
 840
 841         return br_opt_get(br, BROPT_VLAN_ENABLED);
 842 }
 843 EXPORT_SYMBOL_GPL(br_vlan_enabled);
 844
 845 int br_vlan_get_proto(const struct net_device *dev, u16 *p_proto)
 846 {
 847         struct net_bridge *br = netdev_priv(dev);
 848
 849         *p_proto = ntohs(br->vlan_proto);
 850
 851         return 0;
 852 }
 853 EXPORT_SYMBOL_GPL(br_vlan_get_proto);
 854
 855 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto)
 856 {
 857         struct switchdev_attr attr = {
 858                 .orig_dev = br->dev,
 859                 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_PROTOCOL,
 860                 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
 861                 .u.vlan_protocol = ntohs(proto),
 862         };
 863         int err = 0;
 864         struct net_bridge_port *p;
 865         struct net_bridge_vlan *vlan;
 866         struct net_bridge_vlan_group *vg;
 867         __be16 oldproto = br->vlan_proto;
 868
 869         if (br->vlan_proto == proto)
 870                 return 0;
 871
 872         err = switchdev_port_attr_set(br->dev, &attr);
 873         if (err && err != -EOPNOTSUPP)
 874                 return err;
 875
 876         /* Add VLANs for the new proto to the device filter. */
 877         list_for_each_entry(p, &br->port_list, list) {
 878                 vg = nbp_vlan_group(p);
 879                 list_for_each_entry(vlan, &vg->vlan_list, vlist) {
 880                         err = vlan_vid_add(p->dev, proto, vlan->vid);
 881                         if (err)
 882                                 goto err_filt;
 883                 }
 884         }
 885
 886         br->vlan_proto = proto;
 887
 888         recalculate_group_addr(br);
 889         br_recalculate_fwd_mask(br);
 890
 891         /* Delete VLANs for the old proto from the device filter. */
 892         list_for_each_entry(p, &br->port_list, list) {
 893                 vg = nbp_vlan_group(p);
 894                 list_for_each_entry(vlan, &vg->vlan_list, vlist)
 895                         vlan_vid_del(p->dev, oldproto, vlan->vid);
 896         }
 897
 898         return 0;
 899
 900 err_filt:
 901         attr.u.vlan_protocol = ntohs(oldproto);
 902         switchdev_port_attr_set(br->dev, &attr);
 903
 904         list_for_each_entry_continue_reverse(vlan, &vg->vlan_list, vlist)
 905                 vlan_vid_del(p->dev, proto, vlan->vid);
 906
 907         list_for_each_entry_continue_reverse(p, &br->port_list, list) {
 908                 vg = nbp_vlan_group(p);
 909                 list_for_each_entry(vlan, &vg->vlan_list, vlist)
 910                         vlan_vid_del(p->dev, proto, vlan->vid);
 911         }
 912
 913         return err;
 914 }
 915
 916 int br_vlan_set_proto(struct net_bridge *br, unsigned long val)
 917 {
 918         if (val != ETH_P_8021Q && val != ETH_P_8021AD)
 919                 return -EPROTONOSUPPORT;
 920
 921         return __br_vlan_set_proto(br, htons(val));
 922 }
 923
 924 int br_vlan_set_stats(struct net_bridge *br, unsigned long val)
 925 {
 926         switch (val) {
 927         case 0:
 928         case 1:
 929                 br_opt_toggle(br, BROPT_VLAN_STATS_ENABLED, !!val);
 930                 break;
 931         default:
 932                 return -EINVAL;
 933         }
 934
 935         return 0;
 936 }
 937
 938 int br_vlan_set_stats_per_port(struct net_bridge *br, unsigned long val)
 939 {
 940         struct net_bridge_port *p;
 941
 942         /* allow to change the option if there are no port vlans configured */
 943         list_for_each_entry(p, &br->port_list, list) {
 944                 struct net_bridge_vlan_group *vg = nbp_vlan_group(p);
 945
 946                 if (vg->num_vlans)
 947                         return -EBUSY;
 948         }
 949
 950         switch (val) {
 951         case 0:
 952         case 1:
 953                 br_opt_toggle(br, BROPT_VLAN_STATS_PER_PORT, !!val);
 954                 break;
 955         default:
 956                 return -EINVAL;
 957         }
 958
 959         return 0;
 960 }
 961
 962 static bool vlan_default_pvid(struct net_bridge_vlan_group *vg, u16 vid)
 963 {
 964         struct net_bridge_vlan *v;
 965
 966         if (vid != vg->pvid)
 967                 return false;
 968
 969         v = br_vlan_lookup(&vg->vlan_hash, vid);
 970         if (v && br_vlan_should_use(v) &&
 971             (v->flags & BRIDGE_VLAN_INFO_UNTAGGED))
 972                 return true;
 973
 974         return false;
 975 }
 976
 977 static void br_vlan_disable_default_pvid(struct net_bridge *br)
 978 {
 979         struct net_bridge_port *p;
 980         u16 pvid = br->default_pvid;
 981
 982         /* Disable default_pvid on all ports where it is still
 983          * configured.
 984          */
 985         if (vlan_default_pvid(br_vlan_group(br), pvid)) {
 986                 if (!br_vlan_delete(br, pvid))
 987                         br_vlan_notify(br, NULL, pvid, 0, RTM_DELVLAN);
 988         }
 989
 990         list_for_each_entry(p, &br->port_list, list) {
 991                 if (vlan_default_pvid(nbp_vlan_group(p), pvid) &&
 992                     !nbp_vlan_delete(p, pvid))
 993                         br_vlan_notify(br, p, pvid, 0, RTM_DELVLAN);
 994         }
 995
 996         br->default_pvid = 0;
 997 }
 998
 999 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid,
1000                                struct netlink_ext_ack *extack)
1001 {
1002         const struct net_bridge_vlan *pvent;
1003         struct net_bridge_vlan_group *vg;
1004         struct net_bridge_port *p;
1005         unsigned long *changed;
1006         bool vlchange;
1007         u16 old_pvid;
1008         int err = 0;
1009
1010         if (!pvid) {
1011                 br_vlan_disable_default_pvid(br);
1012                 return 0;
1013         }
1014
1015         changed = bitmap_zalloc(BR_MAX_PORTS, GFP_KERNEL);
1016         if (!changed)
1017                 return -ENOMEM;
1018
1019         old_pvid = br->default_pvid;
1020
1021         /* Update default_pvid config only if we do not conflict with
1022          * user configuration.
1023          */
1024         vg = br_vlan_group(br);
1025         pvent = br_vlan_find(vg, pvid);
1026         if ((!old_pvid || vlan_default_pvid(vg, old_pvid)) &&
1027             (!pvent || !br_vlan_should_use(pvent))) {
1028                 err = br_vlan_add(br, pvid,
1029                                   BRIDGE_VLAN_INFO_PVID |
1030                                   BRIDGE_VLAN_INFO_UNTAGGED |
1031                                   BRIDGE_VLAN_INFO_BRENTRY,
1032                                   &vlchange, extack);
1033                 if (err)
1034                         goto out;
1035
1036                 if (br_vlan_delete(br, old_pvid))
1037                         br_vlan_notify(br, NULL, old_pvid, 0, RTM_DELVLAN);
1038                 br_vlan_notify(br, NULL, pvid, 0, RTM_NEWVLAN);
1039                 set_bit(0, changed);
1040         }
1041
1042         list_for_each_entry(p, &br->port_list, list) {
1043                 /* Update default_pvid config only if we do not conflict with
1044                  * user configuration.
1045                  */
1046                 vg = nbp_vlan_group(p);
1047                 if ((old_pvid &&
1048                      !vlan_default_pvid(vg, old_pvid)) ||
1049                     br_vlan_find(vg, pvid))
1050                         continue;
1051
1052                 err = nbp_vlan_add(p, pvid,
1053                                    BRIDGE_VLAN_INFO_PVID |
1054                                    BRIDGE_VLAN_INFO_UNTAGGED,
1055                                    &vlchange, extack);
1056                 if (err)
1057                         goto err_port;
1058                 if (nbp_vlan_delete(p, old_pvid))
1059                         br_vlan_notify(br, p, old_pvid, 0, RTM_DELVLAN);
1060                 br_vlan_notify(p->br, p, pvid, 0, RTM_NEWVLAN);
1061                 set_bit(p->port_no, changed);
1062         }
1063
1064         br->default_pvid = pvid;
1065
1066 out:
1067         bitmap_free(changed);
1068         return err;
1069
1070 err_port:
1071         list_for_each_entry_continue_reverse(p, &br->port_list, list) {
1072                 if (!test_bit(p->port_no, changed))
1073                         continue;
1074
1075                 if (old_pvid) {
1076                         nbp_vlan_add(p, old_pvid,
1077                                      BRIDGE_VLAN_INFO_PVID |
1078                                      BRIDGE_VLAN_INFO_UNTAGGED,
1079                                      &vlchange, NULL);
1080                         br_vlan_notify(p->br, p, old_pvid, 0, RTM_NEWVLAN);
1081                 }
1082                 nbp_vlan_delete(p, pvid);
1083                 br_vlan_notify(br, p, pvid, 0, RTM_DELVLAN);
1084         }
1085
1086         if (test_bit(0, changed)) {
1087                 if (old_pvid) {
1088                         br_vlan_add(br, old_pvid,
1089                                     BRIDGE_VLAN_INFO_PVID |
1090                                     BRIDGE_VLAN_INFO_UNTAGGED |
1091                                     BRIDGE_VLAN_INFO_BRENTRY,
1092                                     &vlchange, NULL);
1093                         br_vlan_notify(br, NULL, old_pvid, 0, RTM_NEWVLAN);
1094                 }
1095                 br_vlan_delete(br, pvid);
1096                 br_vlan_notify(br, NULL, pvid, 0, RTM_DELVLAN);
1097         }
1098         goto out;
1099 }
1100
1101 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val)
1102 {
1103         u16 pvid = val;
1104         int err = 0;
1105
1106         if (val >= VLAN_VID_MASK)
1107                 return -EINVAL;
1108
1109         if (pvid == br->default_pvid)
1110                 goto out;
1111
1112         /* Only allow default pvid change when filtering is disabled */
1113         if (br_opt_get(br, BROPT_VLAN_ENABLED)) {
1114                 pr_info_once("Please disable vlan filtering to change default_pvid\n");
1115                 err = -EPERM;
1116                 goto out;
1117         }
1118         err = __br_vlan_set_default_pvid(br, pvid, NULL);
1119 out:
1120         return err;
1121 }
1122
1123 int br_vlan_init(struct net_bridge *br)
1124 {
1125         struct net_bridge_vlan_group *vg;
1126         int ret = -ENOMEM;
1127
1128         vg = kzalloc(sizeof(*vg), GFP_KERNEL);
1129         if (!vg)
1130                 goto out;
1131         ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params);
1132         if (ret)
1133                 goto err_rhtbl;
1134         ret = vlan_tunnel_init(vg);
1135         if (ret)
1136                 goto err_tunnel_init;
1137         INIT_LIST_HEAD(&vg->vlan_list);
1138         br->vlan_proto = htons(ETH_P_8021Q);
1139         br->default_pvid = 1;
1140         rcu_assign_pointer(br->vlgrp, vg);
1141
1142 out:
1143         return ret;
1144
1145 err_tunnel_init:
1146         rhashtable_destroy(&vg->vlan_hash);
1147 err_rhtbl:
1148         kfree(vg);
1149
1150         goto out;
1151 }
1152
1153 int nbp_vlan_init(struct net_bridge_port *p, struct netlink_ext_ack *extack)
1154 {
1155         struct switchdev_attr attr = {
1156                 .orig_dev = p->br->dev,
1157                 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
1158                 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
1159                 .u.vlan_filtering = br_opt_get(p->br, BROPT_VLAN_ENABLED),
1160         };
1161         struct net_bridge_vlan_group *vg;
1162         int ret = -ENOMEM;
1163
1164         vg = kzalloc(sizeof(struct net_bridge_vlan_group), GFP_KERNEL);
1165         if (!vg)
1166                 goto out;
1167
1168         ret = switchdev_port_attr_set(p->dev, &attr);
1169         if (ret && ret != -EOPNOTSUPP)
1170                 goto err_vlan_enabled;
1171
1172         ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params);
1173         if (ret)
1174                 goto err_rhtbl;
1175         ret = vlan_tunnel_init(vg);
1176         if (ret)
1177                 goto err_tunnel_init;
1178         INIT_LIST_HEAD(&vg->vlan_list);
1179         rcu_assign_pointer(p->vlgrp, vg);
1180         if (p->br->default_pvid) {
1181                 bool changed;
1182
1183                 ret = nbp_vlan_add(p, p->br->default_pvid,
1184                                    BRIDGE_VLAN_INFO_PVID |
1185                                    BRIDGE_VLAN_INFO_UNTAGGED,
1186                                    &changed, extack);
1187                 if (ret)
1188                         goto err_vlan_add;
1189                 br_vlan_notify(p->br, p, p->br->default_pvid, 0, RTM_NEWVLAN);
1190         }
1191 out:
1192         return ret;
1193
1194 err_vlan_add:
1195         RCU_INIT_POINTER(p->vlgrp, NULL);
1196         synchronize_rcu();
1197         vlan_tunnel_deinit(vg);
1198 err_tunnel_init:
1199         rhashtable_destroy(&vg->vlan_hash);
1200 err_rhtbl:
1201 err_vlan_enabled:
1202         kfree(vg);
1203
1204         goto out;
1205 }
1206
1207 /* Must be protected by RTNL.
1208  * Must be called with vid in range from 1 to 4094 inclusive.
1209  * changed must be true only if the vlan was created or updated
1210  */
1211 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
1212                  bool *changed, struct netlink_ext_ack *extack)
1213 {
1214         struct net_bridge_vlan *vlan;
1215         int ret;
1216
1217         ASSERT_RTNL();
1218
1219         *changed = false;
1220         vlan = br_vlan_find(nbp_vlan_group(port), vid);
1221         if (vlan) {
1222                 /* Pass the flags to the hardware bridge */
1223                 ret = br_switchdev_port_vlan_add(port->dev, vid, flags, extack);
1224                 if (ret && ret != -EOPNOTSUPP)
1225                         return ret;
1226                 *changed = __vlan_add_flags(vlan, flags);
1227
1228                 return 0;
1229         }
1230
1231         vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
1232         if (!vlan)
1233                 return -ENOMEM;
1234
1235         vlan->vid = vid;
1236         vlan->port = port;
1237         ret = __vlan_add(vlan, flags, extack);
1238         if (ret)
1239                 kfree(vlan);
1240         else
1241                 *changed = true;
1242
1243         return ret;
1244 }
1245
1246 /* Must be protected by RTNL.
1247  * Must be called with vid in range from 1 to 4094 inclusive.
1248  */
1249 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
1250 {
1251         struct net_bridge_vlan *v;
1252
1253         ASSERT_RTNL();
1254
1255         v = br_vlan_find(nbp_vlan_group(port), vid);
1256         if (!v)
1257                 return -ENOENT;
1258         br_fdb_find_delete_local(port->br, port, port->dev->dev_addr, vid);
1259         br_fdb_delete_by_port(port->br, port, vid, 0);
1260
1261         return __vlan_del(v);
1262 }
1263
1264 void nbp_vlan_flush(struct net_bridge_port *port)
1265 {
1266         struct net_bridge_vlan_group *vg;
1267
1268         ASSERT_RTNL();
1269
1270         vg = nbp_vlan_group(port);
1271         __vlan_flush(port->br, port, vg);
1272         RCU_INIT_POINTER(port->vlgrp, NULL);
1273         synchronize_rcu();
1274         __vlan_group_free(vg);
1275 }
1276
1277 void br_vlan_get_stats(const struct net_bridge_vlan *v,
1278                        struct pcpu_sw_netstats *stats)
1279 {
1280         int i;
1281
1282         memset(stats, 0, sizeof(*stats));
1283         for_each_possible_cpu(i) {
1284                 u64 rxpackets, rxbytes, txpackets, txbytes;
1285                 struct pcpu_sw_netstats *cpu_stats;
1286                 unsigned int start;
1287
1288                 cpu_stats = per_cpu_ptr(v->stats, i);
1289                 do {
1290                         start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1291                         rxpackets = cpu_stats->rx_packets;
1292                         rxbytes = cpu_stats->rx_bytes;
1293                         txbytes = cpu_stats->tx_bytes;
1294                         txpackets = cpu_stats->tx_packets;
1295                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
1296
1297                 stats->rx_packets += rxpackets;
1298                 stats->rx_bytes += rxbytes;
1299                 stats->tx_bytes += txbytes;
1300                 stats->tx_packets += txpackets;
1301         }
1302 }
1303
1304 int br_vlan_get_pvid(const struct net_device *dev, u16 *p_pvid)
1305 {
1306         struct net_bridge_vlan_group *vg;
1307         struct net_bridge_port *p;
1308
1309         ASSERT_RTNL();
1310         p = br_port_get_check_rtnl(dev);
1311         if (p)
1312                 vg = nbp_vlan_group(p);
1313         else if (netif_is_bridge_master(dev))
1314                 vg = br_vlan_group(netdev_priv(dev));
1315         else
1316                 return -EINVAL;
1317
1318         *p_pvid = br_get_pvid(vg);
1319         return 0;
1320 }
1321 EXPORT_SYMBOL_GPL(br_vlan_get_pvid);
1322
1323 int br_vlan_get_pvid_rcu(const struct net_device *dev, u16 *p_pvid)
1324 {
1325         struct net_bridge_vlan_group *vg;
1326         struct net_bridge_port *p;
1327
1328         p = br_port_get_check_rcu(dev);
1329         if (p)
1330                 vg = nbp_vlan_group_rcu(p);
1331         else if (netif_is_bridge_master(dev))
1332                 vg = br_vlan_group_rcu(netdev_priv(dev));
1333         else
1334                 return -EINVAL;
1335
1336         *p_pvid = br_get_pvid(vg);
1337         return 0;
1338 }
1339 EXPORT_SYMBOL_GPL(br_vlan_get_pvid_rcu);
1340
1341 int br_vlan_get_info(const struct net_device *dev, u16 vid,
1342                      struct bridge_vlan_info *p_vinfo)
1343 {
1344         struct net_bridge_vlan_group *vg;
1345         struct net_bridge_vlan *v;
1346         struct net_bridge_port *p;
1347
1348         ASSERT_RTNL();
1349         p = br_port_get_check_rtnl(dev);
1350         if (p)
1351                 vg = nbp_vlan_group(p);
1352         else if (netif_is_bridge_master(dev))
1353                 vg = br_vlan_group(netdev_priv(dev));
1354         else
1355                 return -EINVAL;
1356
1357         v = br_vlan_find(vg, vid);
1358         if (!v)
1359                 return -ENOENT;
1360
1361         p_vinfo->vid = vid;
1362         p_vinfo->flags = v->flags;
1363         if (vid == br_get_pvid(vg))
1364                 p_vinfo->flags |= BRIDGE_VLAN_INFO_PVID;
1365         return 0;
1366 }
1367 EXPORT_SYMBOL_GPL(br_vlan_get_info);
1368
1369 static int br_vlan_is_bind_vlan_dev(const struct net_device *dev)
1370 {
1371         return is_vlan_dev(dev) &&
1372                 !!(vlan_dev_priv(dev)->flags & VLAN_FLAG_BRIDGE_BINDING);
1373 }
1374
1375 static int br_vlan_is_bind_vlan_dev_fn(struct net_device *dev,
1376                                __always_unused struct netdev_nested_priv *priv)
1377 {
1378         return br_vlan_is_bind_vlan_dev(dev);
1379 }
1380
1381 static bool br_vlan_has_upper_bind_vlan_dev(struct net_device *dev)
1382 {
1383         int found;
1384
1385         rcu_read_lock();
1386         found = netdev_walk_all_upper_dev_rcu(dev, br_vlan_is_bind_vlan_dev_fn,
1387                                               NULL);
1388         rcu_read_unlock();
1389
1390         return !!found;
1391 }
1392
1393 struct br_vlan_bind_walk_data {
1394         u16 vid;
1395         struct net_device *result;
1396 };
1397
1398 static int br_vlan_match_bind_vlan_dev_fn(struct net_device *dev,
1399                                           struct netdev_nested_priv *priv)
1400 {
1401         struct br_vlan_bind_walk_data *data = priv->data;
1402         int found = 0;
1403
1404         if (br_vlan_is_bind_vlan_dev(dev) &&
1405             vlan_dev_priv(dev)->vlan_id == data->vid) {
1406                 data->result = dev;
1407                 found = 1;
1408         }
1409
1410         return found;
1411 }
1412
1413 static struct net_device *
1414 br_vlan_get_upper_bind_vlan_dev(struct net_device *dev, u16 vid)
1415 {
1416         struct br_vlan_bind_walk_data data = {
1417                 .vid = vid,
1418         };
1419         struct netdev_nested_priv priv = {
1420                 .data = (void *)&data,
1421         };
1422
1423         rcu_read_lock();
1424         netdev_walk_all_upper_dev_rcu(dev, br_vlan_match_bind_vlan_dev_fn,
1425                                       &priv);
1426         rcu_read_unlock();
1427
1428         return data.result;
1429 }
1430
1431 static bool br_vlan_is_dev_up(const struct net_device *dev)
1432 {
1433         return  !!(dev->flags & IFF_UP) && netif_oper_up(dev);
1434 }
1435
1436 static void br_vlan_set_vlan_dev_state(const struct net_bridge *br,
1437                                        struct net_device *vlan_dev)
1438 {
1439         u16 vid = vlan_dev_priv(vlan_dev)->vlan_id;
1440         struct net_bridge_vlan_group *vg;
1441         struct net_bridge_port *p;
1442         bool has_carrier = false;
1443
1444         if (!netif_carrier_ok(br->dev)) {
1445                 netif_carrier_off(vlan_dev);
1446                 return;
1447         }
1448
1449         list_for_each_entry(p, &br->port_list, list) {
1450                 vg = nbp_vlan_group(p);
1451                 if (br_vlan_find(vg, vid) && br_vlan_is_dev_up(p->dev)) {
1452                         has_carrier = true;
1453                         break;
1454                 }
1455         }
1456
1457         if (has_carrier)
1458                 netif_carrier_on(vlan_dev);
1459         else
1460                 netif_carrier_off(vlan_dev);
1461 }
1462
1463 static void br_vlan_set_all_vlan_dev_state(struct net_bridge_port *p)
1464 {
1465         struct net_bridge_vlan_group *vg = nbp_vlan_group(p);
1466         struct net_bridge_vlan *vlan;
1467         struct net_device *vlan_dev;
1468
1469         list_for_each_entry(vlan, &vg->vlan_list, vlist) {
1470                 vlan_dev = br_vlan_get_upper_bind_vlan_dev(p->br->dev,
1471                                                            vlan->vid);
1472                 if (vlan_dev) {
1473                         if (br_vlan_is_dev_up(p->dev)) {
1474                                 if (netif_carrier_ok(p->br->dev))
1475                                         netif_carrier_on(vlan_dev);
1476                         } else {
1477                                 br_vlan_set_vlan_dev_state(p->br, vlan_dev);
1478                         }
1479                 }
1480         }
1481 }
1482
1483 static void br_vlan_upper_change(struct net_device *dev,
1484                                  struct net_device *upper_dev,
1485                                  bool linking)
1486 {
1487         struct net_bridge *br = netdev_priv(dev);
1488
1489         if (!br_vlan_is_bind_vlan_dev(upper_dev))
1490                 return;
1491
1492         if (linking) {
1493                 br_vlan_set_vlan_dev_state(br, upper_dev);
1494                 br_opt_toggle(br, BROPT_VLAN_BRIDGE_BINDING, true);
1495         } else {
1496                 br_opt_toggle(br, BROPT_VLAN_BRIDGE_BINDING,
1497                               br_vlan_has_upper_bind_vlan_dev(dev));
1498         }
1499 }
1500
1501 struct br_vlan_link_state_walk_data {
1502         struct net_bridge *br;
1503 };
1504
1505 static int br_vlan_link_state_change_fn(struct net_device *vlan_dev,
1506                                         struct netdev_nested_priv *priv)
1507 {
1508         struct br_vlan_link_state_walk_data *data = priv->data;
1509
1510         if (br_vlan_is_bind_vlan_dev(vlan_dev))
1511                 br_vlan_set_vlan_dev_state(data->br, vlan_dev);
1512
1513         return 0;
1514 }
1515
1516 static void br_vlan_link_state_change(struct net_device *dev,
1517                                       struct net_bridge *br)
1518 {
1519         struct br_vlan_link_state_walk_data data = {
1520                 .br = br
1521         };
1522         struct netdev_nested_priv priv = {
1523                 .data = (void *)&data,
1524         };
1525
1526         rcu_read_lock();
1527         netdev_walk_all_upper_dev_rcu(dev, br_vlan_link_state_change_fn,
1528                                       &priv);
1529         rcu_read_unlock();
1530 }
1531
1532 /* Must be protected by RTNL. */
1533 static void nbp_vlan_set_vlan_dev_state(struct net_bridge_port *p, u16 vid)
1534 {
1535         struct net_device *vlan_dev;
1536
1537         if (!br_opt_get(p->br, BROPT_VLAN_BRIDGE_BINDING))
1538                 return;
1539
1540         vlan_dev = br_vlan_get_upper_bind_vlan_dev(p->br->dev, vid);
1541         if (vlan_dev)
1542                 br_vlan_set_vlan_dev_state(p->br, vlan_dev);
1543 }
1544
1545 /* Must be protected by RTNL. */
1546 int br_vlan_bridge_event(struct net_device *dev, unsigned long event, void *ptr)
1547 {
1548         struct netdev_notifier_changeupper_info *info;
1549         struct net_bridge *br = netdev_priv(dev);
1550         int vlcmd = 0, ret = 0;
1551         bool changed = false;
1552
1553         switch (event) {
1554         case NETDEV_REGISTER:
1555                 ret = br_vlan_add(br, br->default_pvid,
1556                                   BRIDGE_VLAN_INFO_PVID |
1557                                   BRIDGE_VLAN_INFO_UNTAGGED |
1558                                   BRIDGE_VLAN_INFO_BRENTRY, &changed, NULL);
1559                 vlcmd = RTM_NEWVLAN;
1560                 break;
1561         case NETDEV_UNREGISTER:
1562                 changed = !br_vlan_delete(br, br->default_pvid);
1563                 vlcmd = RTM_DELVLAN;
1564                 break;
1565         case NETDEV_CHANGEUPPER:
1566                 info = ptr;
1567                 br_vlan_upper_change(dev, info->upper_dev, info->linking);
1568                 break;
1569
1570         case NETDEV_CHANGE:
1571         case NETDEV_UP:
1572                 if (!br_opt_get(br, BROPT_VLAN_BRIDGE_BINDING))
1573                         break;
1574                 br_vlan_link_state_change(dev, br);
1575                 break;
1576         }
1577         if (changed)
1578                 br_vlan_notify(br, NULL, br->default_pvid, 0, vlcmd);
1579
1580         return ret;
1581 }
1582
1583 /* Must be protected by RTNL. */
1584 void br_vlan_port_event(struct net_bridge_port *p, unsigned long event)
1585 {
1586         if (!br_opt_get(p->br, BROPT_VLAN_BRIDGE_BINDING))
1587                 return;
1588
1589         switch (event) {
1590         case NETDEV_CHANGE:
1591         case NETDEV_DOWN:
1592         case NETDEV_UP:
1593                 br_vlan_set_all_vlan_dev_state(p);
1594                 break;
1595         }
1596 }
1597
1598 static bool br_vlan_stats_fill(struct sk_buff *skb,
1599                                const struct net_bridge_vlan *v)
1600 {
1601         struct pcpu_sw_netstats stats;
1602         struct nlattr *nest;
1603
1604         nest = nla_nest_start(skb, BRIDGE_VLANDB_ENTRY_STATS);
1605         if (!nest)
1606                 return false;
1607
1608         br_vlan_get_stats(v, &stats);
1609         if (nla_put_u64_64bit(skb, BRIDGE_VLANDB_STATS_RX_BYTES, stats.rx_bytes,
1610                               BRIDGE_VLANDB_STATS_PAD) ||
1611             nla_put_u64_64bit(skb, BRIDGE_VLANDB_STATS_RX_PACKETS,
1612                               stats.rx_packets, BRIDGE_VLANDB_STATS_PAD) ||
1613             nla_put_u64_64bit(skb, BRIDGE_VLANDB_STATS_TX_BYTES, stats.tx_bytes,
1614                               BRIDGE_VLANDB_STATS_PAD) ||
1615             nla_put_u64_64bit(skb, BRIDGE_VLANDB_STATS_TX_PACKETS,
1616                               stats.tx_packets, BRIDGE_VLANDB_STATS_PAD))
1617                 goto out_err;
1618
1619         nla_nest_end(skb, nest);
1620
1621         return true;
1622
1623 out_err:
1624         nla_nest_cancel(skb, nest);
1625         return false;
1626 }
1627
1628 /* v_opts is used to dump the options which must be equal in the whole range */
1629 static bool br_vlan_fill_vids(struct sk_buff *skb, u16 vid, u16 vid_range,
1630                               const struct net_bridge_vlan *v_opts,
1631                               u16 flags,
1632                               bool dump_stats)
1633 {
1634         struct bridge_vlan_info info;
1635         struct nlattr *nest;
1636
1637         nest = nla_nest_start(skb, BRIDGE_VLANDB_ENTRY);
1638         if (!nest)
1639                 return false;
1640
1641         memset(&info, 0, sizeof(info));
1642         info.vid = vid;
1643         if (flags & BRIDGE_VLAN_INFO_UNTAGGED)
1644                 info.flags |= BRIDGE_VLAN_INFO_UNTAGGED;
1645         if (flags & BRIDGE_VLAN_INFO_PVID)
1646                 info.flags |= BRIDGE_VLAN_INFO_PVID;
1647
1648         if (nla_put(skb, BRIDGE_VLANDB_ENTRY_INFO, sizeof(info), &info))
1649                 goto out_err;
1650
1651         if (vid_range && vid < vid_range &&
1652             !(flags & BRIDGE_VLAN_INFO_PVID) &&
1653             nla_put_u16(skb, BRIDGE_VLANDB_ENTRY_RANGE, vid_range))
1654                 goto out_err;
1655
1656         if (v_opts) {
1657                 if (!br_vlan_opts_fill(skb, v_opts))
1658                         goto out_err;
1659
1660                 if (dump_stats && !br_vlan_stats_fill(skb, v_opts))
1661                         goto out_err;
1662         }
1663
1664         nla_nest_end(skb, nest);
1665
1666         return true;
1667
1668 out_err:
1669         nla_nest_cancel(skb, nest);
1670         return false;
1671 }
1672
1673 static size_t rtnl_vlan_nlmsg_size(void)
1674 {
1675         return NLMSG_ALIGN(sizeof(struct br_vlan_msg))
1676                 + nla_total_size(0) /* BRIDGE_VLANDB_ENTRY */
1677                 + nla_total_size(sizeof(u16)) /* BRIDGE_VLANDB_ENTRY_RANGE */
1678                 + nla_total_size(sizeof(struct bridge_vlan_info)) /* BRIDGE_VLANDB_ENTRY_INFO */
1679                 + br_vlan_opts_nl_size(); /* bridge vlan options */
1680 }
1681
1682 void br_vlan_notify(const struct net_bridge *br,
1683                     const struct net_bridge_port *p,
1684                     u16 vid, u16 vid_range,
1685                     int cmd)
1686 {
1687         struct net_bridge_vlan_group *vg;
1688         struct net_bridge_vlan *v = NULL;
1689         struct br_vlan_msg *bvm;
1690         struct nlmsghdr *nlh;
1691         struct sk_buff *skb;
1692         int err = -ENOBUFS;
1693         struct net *net;
1694         u16 flags = 0;
1695         int ifindex;
1696
1697         /* right now notifications are done only with rtnl held */
1698         ASSERT_RTNL();
1699
1700         if (p) {
1701                 ifindex = p->dev->ifindex;
1702                 vg = nbp_vlan_group(p);
1703                 net = dev_net(p->dev);
1704         } else {
1705                 ifindex = br->dev->ifindex;
1706                 vg = br_vlan_group(br);
1707                 net = dev_net(br->dev);
1708         }
1709
1710         skb = nlmsg_new(rtnl_vlan_nlmsg_size(), GFP_KERNEL);
1711         if (!skb)
1712                 goto out_err;
1713
1714         err = -EMSGSIZE;
1715         nlh = nlmsg_put(skb, 0, 0, cmd, sizeof(*bvm), 0);
1716         if (!nlh)
1717                 goto out_err;
1718         bvm = nlmsg_data(nlh);
1719         memset(bvm, 0, sizeof(*bvm));
1720         bvm->family = AF_BRIDGE;
1721         bvm->ifindex = ifindex;
1722
1723         switch (cmd) {
1724         case RTM_NEWVLAN:
1725                 /* need to find the vlan due to flags/options */
1726                 v = br_vlan_find(vg, vid);
1727                 if (!v || !br_vlan_should_use(v))
1728                         goto out_kfree;
1729
1730                 flags = v->flags;
1731                 if (br_get_pvid(vg) == v->vid)
1732                         flags |= BRIDGE_VLAN_INFO_PVID;
1733                 break;
1734         case RTM_DELVLAN:
1735                 break;
1736         default:
1737                 goto out_kfree;
1738         }
1739
1740         if (!br_vlan_fill_vids(skb, vid, vid_range, v, flags, false))
1741                 goto out_err;
1742
1743         nlmsg_end(skb, nlh);
1744         rtnl_notify(skb, net, 0, RTNLGRP_BRVLAN, NULL, GFP_KERNEL);
1745         return;
1746
1747 out_err:
1748         rtnl_set_sk_err(net, RTNLGRP_BRVLAN, err);
1749 out_kfree:
1750         kfree_skb(skb);
1751 }
1752
1753 /* check if v_curr can enter a range ending in range_end */
1754 bool br_vlan_can_enter_range(const struct net_bridge_vlan *v_curr,
1755                              const struct net_bridge_vlan *range_end)
1756 {
1757         return v_curr->vid - range_end->vid == 1 &&
1758                range_end->flags == v_curr->flags &&
1759                br_vlan_opts_eq_range(v_curr, range_end);
1760 }
1761
1762 static int br_vlan_dump_dev(const struct net_device *dev,
1763                             struct sk_buff *skb,
1764                             struct netlink_callback *cb,
1765                             u32 dump_flags)
1766 {
1767         struct net_bridge_vlan *v, *range_start = NULL, *range_end = NULL;
1768         bool dump_stats = !!(dump_flags & BRIDGE_VLANDB_DUMPF_STATS);
1769         struct net_bridge_vlan_group *vg;
1770         int idx = 0, s_idx = cb->args[1];
1771         struct nlmsghdr *nlh = NULL;
1772         struct net_bridge_port *p;
1773         struct br_vlan_msg *bvm;
1774         struct net_bridge *br;
1775         int err = 0;
1776         u16 pvid;
1777
1778         if (!netif_is_bridge_master(dev) && !netif_is_bridge_port(dev))
1779                 return -EINVAL;
1780
1781         if (netif_is_bridge_master(dev)) {
1782                 br = netdev_priv(dev);
1783                 vg = br_vlan_group_rcu(br);
1784                 p = NULL;
1785         } else {
1786                 p = br_port_get_rcu(dev);
1787                 if (WARN_ON(!p))
1788                         return -EINVAL;
1789                 vg = nbp_vlan_group_rcu(p);
1790                 br = p->br;
1791         }
1792
1793         if (!vg)
1794                 return 0;
1795
1796         nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1797                         RTM_NEWVLAN, sizeof(*bvm), NLM_F_MULTI);
1798         if (!nlh)
1799                 return -EMSGSIZE;
1800         bvm = nlmsg_data(nlh);
1801         memset(bvm, 0, sizeof(*bvm));
1802         bvm->family = PF_BRIDGE;
1803         bvm->ifindex = dev->ifindex;
1804         pvid = br_get_pvid(vg);
1805
1806         /* idx must stay at range's beginning until it is filled in */
1807         list_for_each_entry_rcu(v, &vg->vlan_list, vlist) {
1808                 if (!br_vlan_should_use(v))
1809                         continue;
1810                 if (idx < s_idx) {
1811                         idx++;
1812                         continue;
1813                 }
1814
1815                 if (!range_start) {
1816                         range_start = v;
1817                         range_end = v;
1818                         continue;
1819                 }
1820
1821                 if (dump_stats || v->vid == pvid ||
1822                     !br_vlan_can_enter_range(v, range_end)) {
1823                         u16 vlan_flags = br_vlan_flags(range_start, pvid);
1824
1825                         if (!br_vlan_fill_vids(skb, range_start->vid,
1826                                                range_end->vid, range_start,
1827                                                vlan_flags, dump_stats)) {
1828                                 err = -EMSGSIZE;
1829                                 break;
1830                         }
1831                         /* advance number of filled vlans */
1832                         idx += range_end->vid - range_start->vid + 1;
1833
1834                         range_start = v;
1835                 }
1836                 range_end = v;
1837         }
1838
1839         /* err will be 0 and range_start will be set in 3 cases here:
1840          * - first vlan (range_start == range_end)
1841          * - last vlan (range_start == range_end, not in range)
1842          * - last vlan range (range_start != range_end, in range)
1843          */
1844         if (!err && range_start &&
1845             !br_vlan_fill_vids(skb, range_start->vid, range_end->vid,
1846                                range_start, br_vlan_flags(range_start, pvid),
1847                                dump_stats))
1848                 err = -EMSGSIZE;
1849
1850         cb->args[1] = err ? idx : 0;
1851
1852         nlmsg_end(skb, nlh);
1853
1854         return err;
1855 }
1856
1857 static const struct nla_policy br_vlan_db_dump_pol[BRIDGE_VLANDB_DUMP_MAX + 1] = {
1858         [BRIDGE_VLANDB_DUMP_FLAGS] = { .type = NLA_U32 },
1859 };
1860
1861 static int br_vlan_rtm_dump(struct sk_buff *skb, struct netlink_callback *cb)
1862 {
1863         struct nlattr *dtb[BRIDGE_VLANDB_DUMP_MAX + 1];
1864         int idx = 0, err = 0, s_idx = cb->args[0];
1865         struct net *net = sock_net(skb->sk);
1866         struct br_vlan_msg *bvm;
1867         struct net_device *dev;
1868         u32 dump_flags = 0;
1869
1870         err = nlmsg_parse(cb->nlh, sizeof(*bvm), dtb, BRIDGE_VLANDB_DUMP_MAX,
1871                           br_vlan_db_dump_pol, cb->extack);
1872         if (err < 0)
1873                 return err;
1874
1875         bvm = nlmsg_data(cb->nlh);
1876         if (dtb[BRIDGE_VLANDB_DUMP_FLAGS])
1877                 dump_flags = nla_get_u32(dtb[BRIDGE_VLANDB_DUMP_FLAGS]);
1878
1879         rcu_read_lock();
1880         if (bvm->ifindex) {
1881                 dev = dev_get_by_index_rcu(net, bvm->ifindex);
1882                 if (!dev) {
1883                         err = -ENODEV;
1884                         goto out_err;
1885                 }
1886                 err = br_vlan_dump_dev(dev, skb, cb, dump_flags);
1887                 if (err && err != -EMSGSIZE)
1888                         goto out_err;
1889         } else {
1890                 for_each_netdev_rcu(net, dev) {
1891                         if (idx < s_idx)
1892                                 goto skip;
1893
1894                         err = br_vlan_dump_dev(dev, skb, cb, dump_flags);
1895                         if (err == -EMSGSIZE)
1896                                 break;
1897 skip:
1898                         idx++;
1899                 }
1900         }
1901         cb->args[0] = idx;
1902         rcu_read_unlock();
1903
1904         return skb->len;
1905
1906 out_err:
1907         rcu_read_unlock();
1908
1909         return err;
1910 }
1911
1912 static const struct nla_policy br_vlan_db_policy[BRIDGE_VLANDB_ENTRY_MAX + 1] = {
1913         [BRIDGE_VLANDB_ENTRY_INFO]      =
1914                 NLA_POLICY_EXACT_LEN(sizeof(struct bridge_vlan_info)),
1915         [BRIDGE_VLANDB_ENTRY_RANGE]     = { .type = NLA_U16 },
1916         [BRIDGE_VLANDB_ENTRY_STATE]     = { .type = NLA_U8 },
1917         [BRIDGE_VLANDB_ENTRY_TUNNEL_INFO] = { .type = NLA_NESTED },
1918 };
1919
1920 static int br_vlan_rtm_process_one(struct net_device *dev,
1921                                    const struct nlattr *attr,
1922                                    int cmd, struct netlink_ext_ack *extack)
1923 {
1924         struct bridge_vlan_info *vinfo, vrange_end, *vinfo_last = NULL;
1925         struct nlattr *tb[BRIDGE_VLANDB_ENTRY_MAX + 1];
1926         bool changed = false, skip_processing = false;
1927         struct net_bridge_vlan_group *vg;
1928         struct net_bridge_port *p = NULL;
1929         int err = 0, cmdmap = 0;
1930         struct net_bridge *br;
1931
1932         if (netif_is_bridge_master(dev)) {
1933                 br = netdev_priv(dev);
1934                 vg = br_vlan_group(br);
1935         } else {
1936                 p = br_port_get_rtnl(dev);
1937                 if (WARN_ON(!p))
1938                         return -ENODEV;
1939                 br = p->br;
1940                 vg = nbp_vlan_group(p);
1941         }
1942
1943         if (WARN_ON(!vg))
1944                 return -ENODEV;
1945
1946         err = nla_parse_nested(tb, BRIDGE_VLANDB_ENTRY_MAX, attr,
1947                                br_vlan_db_policy, extack);
1948         if (err)
1949                 return err;
1950
1951         if (!tb[BRIDGE_VLANDB_ENTRY_INFO]) {
1952                 NL_SET_ERR_MSG_MOD(extack, "Missing vlan entry info");
1953                 return -EINVAL;
1954         }
1955         memset(&vrange_end, 0, sizeof(vrange_end));
1956
1957         vinfo = nla_data(tb[BRIDGE_VLANDB_ENTRY_INFO]);
1958         if (vinfo->flags & (BRIDGE_VLAN_INFO_RANGE_BEGIN |
1959                             BRIDGE_VLAN_INFO_RANGE_END)) {
1960                 NL_SET_ERR_MSG_MOD(extack, "Old-style vlan ranges are not allowed when using RTM vlan calls");
1961                 return -EINVAL;
1962         }
1963         if (!br_vlan_valid_id(vinfo->vid, extack))
1964                 return -EINVAL;
1965
1966         if (tb[BRIDGE_VLANDB_ENTRY_RANGE]) {
1967                 vrange_end.vid = nla_get_u16(tb[BRIDGE_VLANDB_ENTRY_RANGE]);
1968                 /* validate user-provided flags without RANGE_BEGIN */
1969                 vrange_end.flags = BRIDGE_VLAN_INFO_RANGE_END | vinfo->flags;
1970                 vinfo->flags |= BRIDGE_VLAN_INFO_RANGE_BEGIN;
1971
1972                 /* vinfo_last is the range start, vinfo the range end */
1973                 vinfo_last = vinfo;
1974                 vinfo = &vrange_end;
1975
1976                 if (!br_vlan_valid_id(vinfo->vid, extack) ||
1977                     !br_vlan_valid_range(vinfo, vinfo_last, extack))
1978                         return -EINVAL;
1979         }
1980
1981         switch (cmd) {
1982         case RTM_NEWVLAN:
1983                 cmdmap = RTM_SETLINK;
1984                 skip_processing = !!(vinfo->flags & BRIDGE_VLAN_INFO_ONLY_OPTS);
1985                 break;
1986         case RTM_DELVLAN:
1987                 cmdmap = RTM_DELLINK;
1988                 break;
1989         }
1990
1991         if (!skip_processing) {
1992                 struct bridge_vlan_info *tmp_last = vinfo_last;
1993
1994                 /* br_process_vlan_info may overwrite vinfo_last */
1995                 err = br_process_vlan_info(br, p, cmdmap, vinfo, &tmp_last,
1996                                            &changed, extack);
1997
1998                 /* notify first if anything changed */
1999                 if (changed)
2000                         br_ifinfo_notify(cmdmap, br, p);
2001
2002                 if (err)
2003                         return err;
2004         }
2005
2006         /* deal with options */
2007         if (cmd == RTM_NEWVLAN) {
2008                 struct net_bridge_vlan *range_start, *range_end;
2009
2010                 if (vinfo_last) {
2011                         range_start = br_vlan_find(vg, vinfo_last->vid);
2012                         range_end = br_vlan_find(vg, vinfo->vid);
2013                 } else {
2014                         range_start = br_vlan_find(vg, vinfo->vid);
2015                         range_end = range_start;
2016                 }
2017
2018                 err = br_vlan_process_options(br, p, range_start, range_end,
2019                                               tb, extack);
2020         }
2021
2022         return err;
2023 }
2024
2025 static int br_vlan_rtm_process(struct sk_buff *skb, struct nlmsghdr *nlh,
2026                                struct netlink_ext_ack *extack)
2027 {
2028         struct net *net = sock_net(skb->sk);
2029         struct br_vlan_msg *bvm;
2030         struct net_device *dev;
2031         struct nlattr *attr;
2032         int err, vlans = 0;
2033         int rem;
2034
2035         /* this should validate the header and check for remaining bytes */
2036         err = nlmsg_parse(nlh, sizeof(*bvm), NULL, BRIDGE_VLANDB_MAX, NULL,
2037                           extack);
2038         if (err < 0)
2039                 return err;
2040
2041         bvm = nlmsg_data(nlh);
2042         dev = __dev_get_by_index(net, bvm->ifindex);
2043         if (!dev)
2044                 return -ENODEV;
2045
2046         if (!netif_is_bridge_master(dev) && !netif_is_bridge_port(dev)) {
2047                 NL_SET_ERR_MSG_MOD(extack, "The device is not a valid bridge or bridge port");
2048                 return -EINVAL;
2049         }
2050
2051         nlmsg_for_each_attr(attr, nlh, sizeof(*bvm), rem) {
2052                 if (nla_type(attr) != BRIDGE_VLANDB_ENTRY)
2053                         continue;
2054
2055                 vlans++;
2056                 err = br_vlan_rtm_process_one(dev, attr, nlh->nlmsg_type,
2057                                               extack);
2058                 if (err)
2059                         break;
2060         }
2061         if (!vlans) {
2062                 NL_SET_ERR_MSG_MOD(extack, "No vlans found to process");
2063                 err = -EINVAL;
2064         }
2065
2066         return err;
2067 }
2068
2069 void br_vlan_rtnl_init(void)
2070 {
2071         rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_GETVLAN, NULL,
2072                              br_vlan_rtm_dump, 0);
2073         rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_NEWVLAN,
2074                              br_vlan_rtm_process, NULL, 0);
2075         rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_DELVLAN,
2076                              br_vlan_rtm_process, NULL, 0);
2077 }
2078
2079 void br_vlan_rtnl_uninit(void)
2080 {
2081         rtnl_unregister(PF_BRIDGE, RTM_GETVLAN);
2082         rtnl_unregister(PF_BRIDGE, RTM_NEWVLAN);
2083         rtnl_unregister(PF_BRIDGE, RTM_DELVLAN);
2084 }