net/bridge/br_vlan.c

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