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 void __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; 42 43 smp_wmb(); 44 br_vlan_set_pvid_state(vg, v->state); 45 vg->pvid = v->vid; 46 } 47 48 static void __vlan_delete_pvid(struct net_bridge_vlan_group *vg, u16 vid) 49 { 50 if (vg->pvid != vid) 51 return; 52 53 smp_wmb(); 54 vg->pvid = 0; 55 } 56 57 /* Update the BRIDGE_VLAN_INFO_PVID and BRIDGE_VLAN_INFO_UNTAGGED flags of @v. 58 * If @commit is false, return just whether the BRIDGE_VLAN_INFO_PVID and 59 * BRIDGE_VLAN_INFO_UNTAGGED bits of @flags would produce any change onto @v. 60 */ 61 static bool __vlan_flags_update(struct net_bridge_vlan *v, u16 flags, 62 bool commit) 63 { 64 struct net_bridge_vlan_group *vg; 65 bool change; 66 67 if (br_vlan_is_master(v)) 68 vg = br_vlan_group(v->br); 69 else 70 vg = nbp_vlan_group(v->port); 71 72 /* check if anything would be changed on commit */ 73 change = !!(flags & BRIDGE_VLAN_INFO_PVID) == !!(vg->pvid != v->vid) || 74 ((flags ^ v->flags) & BRIDGE_VLAN_INFO_UNTAGGED); 75 76 if (!commit) 77 goto out; 78 79 if (flags & BRIDGE_VLAN_INFO_PVID) 80 __vlan_add_pvid(vg, v); 81 else 82 __vlan_delete_pvid(vg, v->vid); 83 84 if (flags & BRIDGE_VLAN_INFO_UNTAGGED) 85 v->flags |= BRIDGE_VLAN_INFO_UNTAGGED; 86 else 87 v->flags &= ~BRIDGE_VLAN_INFO_UNTAGGED; 88 89 out: 90 return change; 91 } 92 93 static bool __vlan_flags_would_change(struct net_bridge_vlan *v, u16 flags) 94 { 95 return __vlan_flags_update(v, flags, false); 96 } 97 98 static void __vlan_flags_commit(struct net_bridge_vlan *v, u16 flags) 99 { 100 __vlan_flags_update(v, flags, true); 101 } 102 103 static int __vlan_vid_add(struct net_device *dev, struct net_bridge *br, 104 struct net_bridge_vlan *v, u16 flags, 105 struct netlink_ext_ack *extack) 106 { 107 int err; 108 109 /* Try switchdev op first. In case it is not supported, fallback to 110 * 8021q add. 111 */ 112 err = br_switchdev_port_vlan_add(dev, v->vid, flags, false, extack); 113 if (err == -EOPNOTSUPP) 114 return vlan_vid_add(dev, br->vlan_proto, v->vid); 115 v->priv_flags |= BR_VLFLAG_ADDED_BY_SWITCHDEV; 116 return err; 117 } 118 119 static void __vlan_add_list(struct net_bridge_vlan *v) 120 { 121 struct net_bridge_vlan_group *vg; 122 struct list_head *headp, *hpos; 123 struct net_bridge_vlan *vent; 124 125 if (br_vlan_is_master(v)) 126 vg = br_vlan_group(v->br); 127 else 128 vg = nbp_vlan_group(v->port); 129 130 headp = &vg->vlan_list; 131 list_for_each_prev(hpos, headp) { 132 vent = list_entry(hpos, struct net_bridge_vlan, vlist); 133 if (v->vid >= vent->vid) 134 break; 135 } 136 list_add_rcu(&v->vlist, hpos); 137 } 138 139 static void __vlan_del_list(struct net_bridge_vlan *v) 140 { 141 list_del_rcu(&v->vlist); 142 } 143 144 static int __vlan_vid_del(struct net_device *dev, struct net_bridge *br, 145 const struct net_bridge_vlan *v) 146 { 147 int err; 148 149 /* Try switchdev op first. In case it is not supported, fallback to 150 * 8021q del. 151 */ 152 err = br_switchdev_port_vlan_del(dev, v->vid); 153 if (!(v->priv_flags & BR_VLFLAG_ADDED_BY_SWITCHDEV)) 154 vlan_vid_del(dev, br->vlan_proto, v->vid); 155 return err == -EOPNOTSUPP ? 0 : err; 156 } 157 158 /* Returns a master vlan, if it didn't exist it gets created. In all cases 159 * a reference is taken to the master vlan before returning. 160 */ 161 static struct net_bridge_vlan * 162 br_vlan_get_master(struct net_bridge *br, u16 vid, 163 struct netlink_ext_ack *extack) 164 { 165 struct net_bridge_vlan_group *vg; 166 struct net_bridge_vlan *masterv; 167 168 vg = br_vlan_group(br); 169 masterv = br_vlan_find(vg, vid); 170 if (!masterv) { 171 bool changed; 172 173 /* missing global ctx, create it now */ 174 if (br_vlan_add(br, vid, 0, &changed, extack)) 175 return NULL; 176 masterv = br_vlan_find(vg, vid); 177 if (WARN_ON(!masterv)) 178 return NULL; 179 refcount_set(&masterv->refcnt, 1); 180 return masterv; 181 } 182 refcount_inc(&masterv->refcnt); 183 184 return masterv; 185 } 186 187 static void br_master_vlan_rcu_free(struct rcu_head *rcu) 188 { 189 struct net_bridge_vlan *v; 190 191 v = container_of(rcu, struct net_bridge_vlan, rcu); 192 WARN_ON(!br_vlan_is_master(v)); 193 free_percpu(v->stats); 194 v->stats = NULL; 195 kfree(v); 196 } 197 198 static void br_vlan_put_master(struct net_bridge_vlan *masterv) 199 { 200 struct net_bridge_vlan_group *vg; 201 202 if (!br_vlan_is_master(masterv)) 203 return; 204 205 vg = br_vlan_group(masterv->br); 206 if (refcount_dec_and_test(&masterv->refcnt)) { 207 rhashtable_remove_fast(&vg->vlan_hash, 208 &masterv->vnode, br_vlan_rht_params); 209 __vlan_del_list(masterv); 210 br_multicast_toggle_one_vlan(masterv, false); 211 br_multicast_ctx_deinit(&masterv->br_mcast_ctx); 212 call_rcu(&masterv->rcu, br_master_vlan_rcu_free); 213 } 214 } 215 216 static void nbp_vlan_rcu_free(struct rcu_head *rcu) 217 { 218 struct net_bridge_vlan *v; 219 220 v = container_of(rcu, struct net_bridge_vlan, rcu); 221 WARN_ON(br_vlan_is_master(v)); 222 /* if we had per-port stats configured then free them here */ 223 if (v->priv_flags & BR_VLFLAG_PER_PORT_STATS) 224 free_percpu(v->stats); 225 v->stats = NULL; 226 kfree(v); 227 } 228 229 static void br_vlan_init_state(struct net_bridge_vlan *v) 230 { 231 struct net_bridge *br; 232 233 if (br_vlan_is_master(v)) 234 br = v->br; 235 else 236 br = v->port->br; 237 238 if (br_opt_get(br, BROPT_MST_ENABLED)) { 239 br_mst_vlan_init_state(v); 240 return; 241 } 242 243 v->state = BR_STATE_FORWARDING; 244 v->msti = 0; 245 } 246 247 /* This is the shared VLAN add function which works for both ports and bridge 248 * devices. There are four possible calls to this function in terms of the 249 * vlan entry type: 250 * 1. vlan is being added on a port (no master flags, global entry exists) 251 * 2. vlan is being added on a bridge (both master and brentry flags) 252 * 3. vlan is being added on a port, but a global entry didn't exist which 253 * is being created right now (master flag set, brentry flag unset), the 254 * global entry is used for global per-vlan features, but not for filtering 255 * 4. same as 3 but with both master and brentry flags set so the entry 256 * will be used for filtering in both the port and the bridge 257 */ 258 static int __vlan_add(struct net_bridge_vlan *v, u16 flags, 259 struct netlink_ext_ack *extack) 260 { 261 struct net_bridge_vlan *masterv = NULL; 262 struct net_bridge_port *p = NULL; 263 struct net_bridge_vlan_group *vg; 264 struct net_device *dev; 265 struct net_bridge *br; 266 int err; 267 268 if (br_vlan_is_master(v)) { 269 br = v->br; 270 dev = br->dev; 271 vg = br_vlan_group(br); 272 } else { 273 p = v->port; 274 br = p->br; 275 dev = p->dev; 276 vg = nbp_vlan_group(p); 277 } 278 279 if (p) { 280 /* Add VLAN to the device filter if it is supported. 281 * This ensures tagged traffic enters the bridge when 282 * promiscuous mode is disabled by br_manage_promisc(). 283 */ 284 err = __vlan_vid_add(dev, br, v, flags, extack); 285 if (err) 286 goto out; 287 288 /* need to work on the master vlan too */ 289 if (flags & BRIDGE_VLAN_INFO_MASTER) { 290 bool changed; 291 292 err = br_vlan_add(br, v->vid, 293 flags | BRIDGE_VLAN_INFO_BRENTRY, 294 &changed, extack); 295 if (err) 296 goto out_filt; 297 298 if (changed) 299 br_vlan_notify(br, NULL, v->vid, 0, 300 RTM_NEWVLAN); 301 } 302 303 masterv = br_vlan_get_master(br, v->vid, extack); 304 if (!masterv) { 305 err = -ENOMEM; 306 goto out_filt; 307 } 308 v->brvlan = masterv; 309 if (br_opt_get(br, BROPT_VLAN_STATS_PER_PORT)) { 310 v->stats = 311 netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 312 if (!v->stats) { 313 err = -ENOMEM; 314 goto out_filt; 315 } 316 v->priv_flags |= BR_VLFLAG_PER_PORT_STATS; 317 } else { 318 v->stats = masterv->stats; 319 } 320 br_multicast_port_ctx_init(p, v, &v->port_mcast_ctx); 321 } else { 322 if (br_vlan_should_use(v)) { 323 err = br_switchdev_port_vlan_add(dev, v->vid, flags, 324 false, extack); 325 if (err && err != -EOPNOTSUPP) 326 goto out; 327 } 328 br_multicast_ctx_init(br, v, &v->br_mcast_ctx); 329 v->priv_flags |= BR_VLFLAG_GLOBAL_MCAST_ENABLED; 330 } 331 332 /* Add the dev mac and count the vlan only if it's usable */ 333 if (br_vlan_should_use(v)) { 334 err = br_fdb_add_local(br, p, dev->dev_addr, v->vid); 335 if (err) { 336 br_err(br, "failed insert local address into bridge forwarding table\n"); 337 goto out_filt; 338 } 339 vg->num_vlans++; 340 } 341 342 /* set the state before publishing */ 343 br_vlan_init_state(v); 344 345 err = rhashtable_lookup_insert_fast(&vg->vlan_hash, &v->vnode, 346 br_vlan_rht_params); 347 if (err) 348 goto out_fdb_insert; 349 350 __vlan_add_list(v); 351 __vlan_flags_commit(v, flags); 352 br_multicast_toggle_one_vlan(v, true); 353 354 if (p) 355 nbp_vlan_set_vlan_dev_state(p, v->vid); 356 out: 357 return err; 358 359 out_fdb_insert: 360 if (br_vlan_should_use(v)) { 361 br_fdb_find_delete_local(br, p, dev->dev_addr, v->vid); 362 vg->num_vlans--; 363 } 364 365 out_filt: 366 if (p) { 367 __vlan_vid_del(dev, br, v); 368 if (masterv) { 369 if (v->stats && masterv->stats != v->stats) 370 free_percpu(v->stats); 371 v->stats = NULL; 372 373 br_vlan_put_master(masterv); 374 v->brvlan = NULL; 375 } 376 } else { 377 br_switchdev_port_vlan_del(dev, v->vid); 378 } 379 380 goto out; 381 } 382 383 static int __vlan_del(struct net_bridge_vlan *v) 384 { 385 struct net_bridge_vlan *masterv = v; 386 struct net_bridge_vlan_group *vg; 387 struct net_bridge_port *p = NULL; 388 int err = 0; 389 390 if (br_vlan_is_master(v)) { 391 vg = br_vlan_group(v->br); 392 } else { 393 p = v->port; 394 vg = nbp_vlan_group(v->port); 395 masterv = v->brvlan; 396 } 397 398 __vlan_delete_pvid(vg, v->vid); 399 if (p) { 400 err = __vlan_vid_del(p->dev, p->br, v); 401 if (err) 402 goto out; 403 } else { 404 err = br_switchdev_port_vlan_del(v->br->dev, v->vid); 405 if (err && err != -EOPNOTSUPP) 406 goto out; 407 err = 0; 408 } 409 410 if (br_vlan_should_use(v)) { 411 v->flags &= ~BRIDGE_VLAN_INFO_BRENTRY; 412 vg->num_vlans--; 413 } 414 415 if (masterv != v) { 416 vlan_tunnel_info_del(vg, v); 417 rhashtable_remove_fast(&vg->vlan_hash, &v->vnode, 418 br_vlan_rht_params); 419 __vlan_del_list(v); 420 nbp_vlan_set_vlan_dev_state(p, v->vid); 421 br_multicast_toggle_one_vlan(v, false); 422 br_multicast_port_ctx_deinit(&v->port_mcast_ctx); 423 call_rcu(&v->rcu, nbp_vlan_rcu_free); 424 } 425 426 br_vlan_put_master(masterv); 427 out: 428 return err; 429 } 430 431 static void __vlan_group_free(struct net_bridge_vlan_group *vg) 432 { 433 WARN_ON(!list_empty(&vg->vlan_list)); 434 rhashtable_destroy(&vg->vlan_hash); 435 vlan_tunnel_deinit(vg); 436 kfree(vg); 437 } 438 439 static void __vlan_flush(const struct net_bridge *br, 440 const struct net_bridge_port *p, 441 struct net_bridge_vlan_group *vg) 442 { 443 struct net_bridge_vlan *vlan, *tmp; 444 u16 v_start = 0, v_end = 0; 445 int err; 446 447 __vlan_delete_pvid(vg, vg->pvid); 448 list_for_each_entry_safe(vlan, tmp, &vg->vlan_list, vlist) { 449 /* take care of disjoint ranges */ 450 if (!v_start) { 451 v_start = vlan->vid; 452 } else if (vlan->vid - v_end != 1) { 453 /* found range end, notify and start next one */ 454 br_vlan_notify(br, p, v_start, v_end, RTM_DELVLAN); 455 v_start = vlan->vid; 456 } 457 v_end = vlan->vid; 458 459 err = __vlan_del(vlan); 460 if (err) { 461 br_err(br, 462 "port %u(%s) failed to delete vlan %d: %pe\n", 463 (unsigned int) p->port_no, p->dev->name, 464 vlan->vid, ERR_PTR(err)); 465 } 466 } 467 468 /* notify about the last/whole vlan range */ 469 if (v_start) 470 br_vlan_notify(br, p, v_start, v_end, RTM_DELVLAN); 471 } 472 473 struct sk_buff *br_handle_vlan(struct net_bridge *br, 474 const struct net_bridge_port *p, 475 struct net_bridge_vlan_group *vg, 476 struct sk_buff *skb) 477 { 478 struct pcpu_sw_netstats *stats; 479 struct net_bridge_vlan *v; 480 u16 vid; 481 482 /* If this packet was not filtered at input, let it pass */ 483 if (!BR_INPUT_SKB_CB(skb)->vlan_filtered) 484 goto out; 485 486 /* At this point, we know that the frame was filtered and contains 487 * a valid vlan id. If the vlan id has untagged flag set, 488 * send untagged; otherwise, send tagged. 489 */ 490 br_vlan_get_tag(skb, &vid); 491 v = br_vlan_find(vg, vid); 492 /* Vlan entry must be configured at this point. The 493 * only exception is the bridge is set in promisc mode and the 494 * packet is destined for the bridge device. In this case 495 * pass the packet as is. 496 */ 497 if (!v || !br_vlan_should_use(v)) { 498 if ((br->dev->flags & IFF_PROMISC) && skb->dev == br->dev) { 499 goto out; 500 } else { 501 kfree_skb(skb); 502 return NULL; 503 } 504 } 505 if (br_opt_get(br, BROPT_VLAN_STATS_ENABLED)) { 506 stats = this_cpu_ptr(v->stats); 507 u64_stats_update_begin(&stats->syncp); 508 u64_stats_add(&stats->tx_bytes, skb->len); 509 u64_stats_inc(&stats->tx_packets); 510 u64_stats_update_end(&stats->syncp); 511 } 512 513 /* If the skb will be sent using forwarding offload, the assumption is 514 * that the switchdev will inject the packet into hardware together 515 * with the bridge VLAN, so that it can be forwarded according to that 516 * VLAN. The switchdev should deal with popping the VLAN header in 517 * hardware on each egress port as appropriate. So only strip the VLAN 518 * header if forwarding offload is not being used. 519 */ 520 if (v->flags & BRIDGE_VLAN_INFO_UNTAGGED && 521 !br_switchdev_frame_uses_tx_fwd_offload(skb)) 522 __vlan_hwaccel_clear_tag(skb); 523 524 if (p && (p->flags & BR_VLAN_TUNNEL) && 525 br_handle_egress_vlan_tunnel(skb, v)) { 526 kfree_skb(skb); 527 return NULL; 528 } 529 out: 530 return skb; 531 } 532 533 /* Called under RCU */ 534 static bool __allowed_ingress(const struct net_bridge *br, 535 struct net_bridge_vlan_group *vg, 536 struct sk_buff *skb, u16 *vid, 537 u8 *state, 538 struct net_bridge_vlan **vlan) 539 { 540 struct pcpu_sw_netstats *stats; 541 struct net_bridge_vlan *v; 542 bool tagged; 543 544 BR_INPUT_SKB_CB(skb)->vlan_filtered = true; 545 /* If vlan tx offload is disabled on bridge device and frame was 546 * sent from vlan device on the bridge device, it does not have 547 * HW accelerated vlan tag. 548 */ 549 if (unlikely(!skb_vlan_tag_present(skb) && 550 skb->protocol == br->vlan_proto)) { 551 skb = skb_vlan_untag(skb); 552 if (unlikely(!skb)) 553 return false; 554 } 555 556 if (!br_vlan_get_tag(skb, vid)) { 557 /* Tagged frame */ 558 if (skb->vlan_proto != br->vlan_proto) { 559 /* Protocol-mismatch, empty out vlan_tci for new tag */ 560 skb_push(skb, ETH_HLEN); 561 skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto, 562 skb_vlan_tag_get(skb)); 563 if (unlikely(!skb)) 564 return false; 565 566 skb_pull(skb, ETH_HLEN); 567 skb_reset_mac_len(skb); 568 *vid = 0; 569 tagged = false; 570 } else { 571 tagged = true; 572 } 573 } else { 574 /* Untagged frame */ 575 tagged = false; 576 } 577 578 if (!*vid) { 579 u16 pvid = br_get_pvid(vg); 580 581 /* Frame had a tag with VID 0 or did not have a tag. 582 * See if pvid is set on this port. That tells us which 583 * vlan untagged or priority-tagged traffic belongs to. 584 */ 585 if (!pvid) 586 goto drop; 587 588 /* PVID is set on this port. Any untagged or priority-tagged 589 * ingress frame is considered to belong to this vlan. 590 */ 591 *vid = pvid; 592 if (likely(!tagged)) 593 /* Untagged Frame. */ 594 __vlan_hwaccel_put_tag(skb, br->vlan_proto, pvid); 595 else 596 /* Priority-tagged Frame. 597 * At this point, we know that skb->vlan_tci VID 598 * field was 0. 599 * We update only VID field and preserve PCP field. 600 */ 601 skb->vlan_tci |= pvid; 602 603 /* if snooping and stats are disabled we can avoid the lookup */ 604 if (!br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED) && 605 !br_opt_get(br, BROPT_VLAN_STATS_ENABLED)) { 606 if (*state == BR_STATE_FORWARDING) { 607 *state = br_vlan_get_pvid_state(vg); 608 if (!br_vlan_state_allowed(*state, true)) 609 goto drop; 610 } 611 return true; 612 } 613 } 614 v = br_vlan_find(vg, *vid); 615 if (!v || !br_vlan_should_use(v)) 616 goto drop; 617 618 if (*state == BR_STATE_FORWARDING) { 619 *state = br_vlan_get_state(v); 620 if (!br_vlan_state_allowed(*state, true)) 621 goto drop; 622 } 623 624 if (br_opt_get(br, BROPT_VLAN_STATS_ENABLED)) { 625 stats = this_cpu_ptr(v->stats); 626 u64_stats_update_begin(&stats->syncp); 627 u64_stats_add(&stats->rx_bytes, skb->len); 628 u64_stats_inc(&stats->rx_packets); 629 u64_stats_update_end(&stats->syncp); 630 } 631 632 *vlan = v; 633 634 return true; 635 636 drop: 637 kfree_skb(skb); 638 return false; 639 } 640 641 bool br_allowed_ingress(const struct net_bridge *br, 642 struct net_bridge_vlan_group *vg, struct sk_buff *skb, 643 u16 *vid, u8 *state, 644 struct net_bridge_vlan **vlan) 645 { 646 /* If VLAN filtering is disabled on the bridge, all packets are 647 * permitted. 648 */ 649 *vlan = NULL; 650 if (!br_opt_get(br, BROPT_VLAN_ENABLED)) { 651 BR_INPUT_SKB_CB(skb)->vlan_filtered = false; 652 return true; 653 } 654 655 return __allowed_ingress(br, vg, skb, vid, state, vlan); 656 } 657 658 /* Called under RCU. */ 659 bool br_allowed_egress(struct net_bridge_vlan_group *vg, 660 const struct sk_buff *skb) 661 { 662 const struct net_bridge_vlan *v; 663 u16 vid; 664 665 /* If this packet was not filtered at input, let it pass */ 666 if (!BR_INPUT_SKB_CB(skb)->vlan_filtered) 667 return true; 668 669 br_vlan_get_tag(skb, &vid); 670 v = br_vlan_find(vg, vid); 671 if (v && br_vlan_should_use(v) && 672 br_vlan_state_allowed(br_vlan_get_state(v), false)) 673 return true; 674 675 return false; 676 } 677 678 /* Called under RCU */ 679 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid) 680 { 681 struct net_bridge_vlan_group *vg; 682 struct net_bridge *br = p->br; 683 struct net_bridge_vlan *v; 684 685 /* If filtering was disabled at input, let it pass. */ 686 if (!br_opt_get(br, BROPT_VLAN_ENABLED)) 687 return true; 688 689 vg = nbp_vlan_group_rcu(p); 690 if (!vg || !vg->num_vlans) 691 return false; 692 693 if (!br_vlan_get_tag(skb, vid) && skb->vlan_proto != br->vlan_proto) 694 *vid = 0; 695 696 if (!*vid) { 697 *vid = br_get_pvid(vg); 698 if (!*vid || 699 !br_vlan_state_allowed(br_vlan_get_pvid_state(vg), true)) 700 return false; 701 702 return true; 703 } 704 705 v = br_vlan_find(vg, *vid); 706 if (v && br_vlan_state_allowed(br_vlan_get_state(v), true)) 707 return true; 708 709 return false; 710 } 711 712 static int br_vlan_add_existing(struct net_bridge *br, 713 struct net_bridge_vlan_group *vg, 714 struct net_bridge_vlan *vlan, 715 u16 flags, bool *changed, 716 struct netlink_ext_ack *extack) 717 { 718 bool would_change = __vlan_flags_would_change(vlan, flags); 719 bool becomes_brentry = false; 720 int err; 721 722 if (!br_vlan_is_brentry(vlan)) { 723 /* Trying to change flags of non-existent bridge vlan */ 724 if (!(flags & BRIDGE_VLAN_INFO_BRENTRY)) 725 return -EINVAL; 726 727 becomes_brentry = true; 728 } 729 730 /* Master VLANs that aren't brentries weren't notified before, 731 * time to notify them now. 732 */ 733 if (becomes_brentry || would_change) { 734 err = br_switchdev_port_vlan_add(br->dev, vlan->vid, flags, 735 would_change, extack); 736 if (err && err != -EOPNOTSUPP) 737 return err; 738 } 739 740 if (becomes_brentry) { 741 /* It was only kept for port vlans, now make it real */ 742 err = br_fdb_add_local(br, NULL, br->dev->dev_addr, vlan->vid); 743 if (err) { 744 br_err(br, "failed to insert local address into bridge forwarding table\n"); 745 goto err_fdb_insert; 746 } 747 748 refcount_inc(&vlan->refcnt); 749 vlan->flags |= BRIDGE_VLAN_INFO_BRENTRY; 750 vg->num_vlans++; 751 *changed = true; 752 br_multicast_toggle_one_vlan(vlan, true); 753 } 754 755 __vlan_flags_commit(vlan, flags); 756 if (would_change) 757 *changed = true; 758 759 return 0; 760 761 err_fdb_insert: 762 br_switchdev_port_vlan_del(br->dev, vlan->vid); 763 return err; 764 } 765 766 /* Must be protected by RTNL. 767 * Must be called with vid in range from 1 to 4094 inclusive. 768 * changed must be true only if the vlan was created or updated 769 */ 770 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, bool *changed, 771 struct netlink_ext_ack *extack) 772 { 773 struct net_bridge_vlan_group *vg; 774 struct net_bridge_vlan *vlan; 775 int ret; 776 777 ASSERT_RTNL(); 778 779 *changed = false; 780 vg = br_vlan_group(br); 781 vlan = br_vlan_find(vg, vid); 782 if (vlan) 783 return br_vlan_add_existing(br, vg, vlan, flags, changed, 784 extack); 785 786 vlan = kzalloc(sizeof(*vlan), GFP_KERNEL); 787 if (!vlan) 788 return -ENOMEM; 789 790 vlan->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 791 if (!vlan->stats) { 792 kfree(vlan); 793 return -ENOMEM; 794 } 795 vlan->vid = vid; 796 vlan->flags = flags | BRIDGE_VLAN_INFO_MASTER; 797 vlan->flags &= ~BRIDGE_VLAN_INFO_PVID; 798 vlan->br = br; 799 if (flags & BRIDGE_VLAN_INFO_BRENTRY) 800 refcount_set(&vlan->refcnt, 1); 801 ret = __vlan_add(vlan, flags, extack); 802 if (ret) { 803 free_percpu(vlan->stats); 804 kfree(vlan); 805 } else { 806 *changed = true; 807 } 808 809 return ret; 810 } 811 812 /* Must be protected by RTNL. 813 * Must be called with vid in range from 1 to 4094 inclusive. 814 */ 815 int br_vlan_delete(struct net_bridge *br, u16 vid) 816 { 817 struct net_bridge_vlan_group *vg; 818 struct net_bridge_vlan *v; 819 820 ASSERT_RTNL(); 821 822 vg = br_vlan_group(br); 823 v = br_vlan_find(vg, vid); 824 if (!v || !br_vlan_is_brentry(v)) 825 return -ENOENT; 826 827 br_fdb_find_delete_local(br, NULL, br->dev->dev_addr, vid); 828 br_fdb_delete_by_port(br, NULL, vid, 0); 829 830 vlan_tunnel_info_del(vg, v); 831 832 return __vlan_del(v); 833 } 834 835 void br_vlan_flush(struct net_bridge *br) 836 { 837 struct net_bridge_vlan_group *vg; 838 839 ASSERT_RTNL(); 840 841 vg = br_vlan_group(br); 842 __vlan_flush(br, NULL, vg); 843 RCU_INIT_POINTER(br->vlgrp, NULL); 844 synchronize_rcu(); 845 __vlan_group_free(vg); 846 } 847 848 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid) 849 { 850 if (!vg) 851 return NULL; 852 853 return br_vlan_lookup(&vg->vlan_hash, vid); 854 } 855 856 /* Must be protected by RTNL. */ 857 static void recalculate_group_addr(struct net_bridge *br) 858 { 859 if (br_opt_get(br, BROPT_GROUP_ADDR_SET)) 860 return; 861 862 spin_lock_bh(&br->lock); 863 if (!br_opt_get(br, BROPT_VLAN_ENABLED) || 864 br->vlan_proto == htons(ETH_P_8021Q)) { 865 /* Bridge Group Address */ 866 br->group_addr[5] = 0x00; 867 } else { /* vlan_enabled && ETH_P_8021AD */ 868 /* Provider Bridge Group Address */ 869 br->group_addr[5] = 0x08; 870 } 871 spin_unlock_bh(&br->lock); 872 } 873 874 /* Must be protected by RTNL. */ 875 void br_recalculate_fwd_mask(struct net_bridge *br) 876 { 877 if (!br_opt_get(br, BROPT_VLAN_ENABLED) || 878 br->vlan_proto == htons(ETH_P_8021Q)) 879 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT; 880 else /* vlan_enabled && ETH_P_8021AD */ 881 br->group_fwd_mask_required = BR_GROUPFWD_8021AD & 882 ~(1u << br->group_addr[5]); 883 } 884 885 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val, 886 struct netlink_ext_ack *extack) 887 { 888 struct switchdev_attr attr = { 889 .orig_dev = br->dev, 890 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING, 891 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP, 892 .u.vlan_filtering = val, 893 }; 894 int err; 895 896 if (br_opt_get(br, BROPT_VLAN_ENABLED) == !!val) 897 return 0; 898 899 br_opt_toggle(br, BROPT_VLAN_ENABLED, !!val); 900 901 err = switchdev_port_attr_set(br->dev, &attr, extack); 902 if (err && err != -EOPNOTSUPP) { 903 br_opt_toggle(br, BROPT_VLAN_ENABLED, !val); 904 return err; 905 } 906 907 br_manage_promisc(br); 908 recalculate_group_addr(br); 909 br_recalculate_fwd_mask(br); 910 if (!val && br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) { 911 br_info(br, "vlan filtering disabled, automatically disabling multicast vlan snooping\n"); 912 br_multicast_toggle_vlan_snooping(br, false, NULL); 913 } 914 915 return 0; 916 } 917 918 bool br_vlan_enabled(const struct net_device *dev) 919 { 920 struct net_bridge *br = netdev_priv(dev); 921 922 return br_opt_get(br, BROPT_VLAN_ENABLED); 923 } 924 EXPORT_SYMBOL_GPL(br_vlan_enabled); 925 926 int br_vlan_get_proto(const struct net_device *dev, u16 *p_proto) 927 { 928 struct net_bridge *br = netdev_priv(dev); 929 930 *p_proto = ntohs(br->vlan_proto); 931 932 return 0; 933 } 934 EXPORT_SYMBOL_GPL(br_vlan_get_proto); 935 936 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto, 937 struct netlink_ext_ack *extack) 938 { 939 struct switchdev_attr attr = { 940 .orig_dev = br->dev, 941 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_PROTOCOL, 942 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP, 943 .u.vlan_protocol = ntohs(proto), 944 }; 945 int err = 0; 946 struct net_bridge_port *p; 947 struct net_bridge_vlan *vlan; 948 struct net_bridge_vlan_group *vg; 949 __be16 oldproto = br->vlan_proto; 950 951 if (br->vlan_proto == proto) 952 return 0; 953 954 err = switchdev_port_attr_set(br->dev, &attr, extack); 955 if (err && err != -EOPNOTSUPP) 956 return err; 957 958 /* Add VLANs for the new proto to the device filter. */ 959 list_for_each_entry(p, &br->port_list, list) { 960 vg = nbp_vlan_group(p); 961 list_for_each_entry(vlan, &vg->vlan_list, vlist) { 962 if (vlan->priv_flags & BR_VLFLAG_ADDED_BY_SWITCHDEV) 963 continue; 964 err = vlan_vid_add(p->dev, proto, vlan->vid); 965 if (err) 966 goto err_filt; 967 } 968 } 969 970 br->vlan_proto = proto; 971 972 recalculate_group_addr(br); 973 br_recalculate_fwd_mask(br); 974 975 /* Delete VLANs for the old proto from the device filter. */ 976 list_for_each_entry(p, &br->port_list, list) { 977 vg = nbp_vlan_group(p); 978 list_for_each_entry(vlan, &vg->vlan_list, vlist) { 979 if (vlan->priv_flags & BR_VLFLAG_ADDED_BY_SWITCHDEV) 980 continue; 981 vlan_vid_del(p->dev, oldproto, vlan->vid); 982 } 983 } 984 985 return 0; 986 987 err_filt: 988 attr.u.vlan_protocol = ntohs(oldproto); 989 switchdev_port_attr_set(br->dev, &attr, NULL); 990 991 list_for_each_entry_continue_reverse(vlan, &vg->vlan_list, vlist) { 992 if (vlan->priv_flags & BR_VLFLAG_ADDED_BY_SWITCHDEV) 993 continue; 994 vlan_vid_del(p->dev, proto, vlan->vid); 995 } 996 997 list_for_each_entry_continue_reverse(p, &br->port_list, list) { 998 vg = nbp_vlan_group(p); 999 list_for_each_entry(vlan, &vg->vlan_list, vlist) { 1000 if (vlan->priv_flags & BR_VLFLAG_ADDED_BY_SWITCHDEV) 1001 continue; 1002 vlan_vid_del(p->dev, proto, vlan->vid); 1003 } 1004 } 1005 1006 return err; 1007 } 1008 1009 int br_vlan_set_proto(struct net_bridge *br, unsigned long val, 1010 struct netlink_ext_ack *extack) 1011 { 1012 if (!eth_type_vlan(htons(val))) 1013 return -EPROTONOSUPPORT; 1014 1015 return __br_vlan_set_proto(br, htons(val), extack); 1016 } 1017 1018 int br_vlan_set_stats(struct net_bridge *br, unsigned long val) 1019 { 1020 switch (val) { 1021 case 0: 1022 case 1: 1023 br_opt_toggle(br, BROPT_VLAN_STATS_ENABLED, !!val); 1024 break; 1025 default: 1026 return -EINVAL; 1027 } 1028 1029 return 0; 1030 } 1031 1032 int br_vlan_set_stats_per_port(struct net_bridge *br, unsigned long val) 1033 { 1034 struct net_bridge_port *p; 1035 1036 /* allow to change the option if there are no port vlans configured */ 1037 list_for_each_entry(p, &br->port_list, list) { 1038 struct net_bridge_vlan_group *vg = nbp_vlan_group(p); 1039 1040 if (vg->num_vlans) 1041 return -EBUSY; 1042 } 1043 1044 switch (val) { 1045 case 0: 1046 case 1: 1047 br_opt_toggle(br, BROPT_VLAN_STATS_PER_PORT, !!val); 1048 break; 1049 default: 1050 return -EINVAL; 1051 } 1052 1053 return 0; 1054 } 1055 1056 static bool vlan_default_pvid(struct net_bridge_vlan_group *vg, u16 vid) 1057 { 1058 struct net_bridge_vlan *v; 1059 1060 if (vid != vg->pvid) 1061 return false; 1062 1063 v = br_vlan_lookup(&vg->vlan_hash, vid); 1064 if (v && br_vlan_should_use(v) && 1065 (v->flags & BRIDGE_VLAN_INFO_UNTAGGED)) 1066 return true; 1067 1068 return false; 1069 } 1070 1071 static void br_vlan_disable_default_pvid(struct net_bridge *br) 1072 { 1073 struct net_bridge_port *p; 1074 u16 pvid = br->default_pvid; 1075 1076 /* Disable default_pvid on all ports where it is still 1077 * configured. 1078 */ 1079 if (vlan_default_pvid(br_vlan_group(br), pvid)) { 1080 if (!br_vlan_delete(br, pvid)) 1081 br_vlan_notify(br, NULL, pvid, 0, RTM_DELVLAN); 1082 } 1083 1084 list_for_each_entry(p, &br->port_list, list) { 1085 if (vlan_default_pvid(nbp_vlan_group(p), pvid) && 1086 !nbp_vlan_delete(p, pvid)) 1087 br_vlan_notify(br, p, pvid, 0, RTM_DELVLAN); 1088 } 1089 1090 br->default_pvid = 0; 1091 } 1092 1093 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid, 1094 struct netlink_ext_ack *extack) 1095 { 1096 const struct net_bridge_vlan *pvent; 1097 struct net_bridge_vlan_group *vg; 1098 struct net_bridge_port *p; 1099 unsigned long *changed; 1100 bool vlchange; 1101 u16 old_pvid; 1102 int err = 0; 1103 1104 if (!pvid) { 1105 br_vlan_disable_default_pvid(br); 1106 return 0; 1107 } 1108 1109 changed = bitmap_zalloc(BR_MAX_PORTS, GFP_KERNEL); 1110 if (!changed) 1111 return -ENOMEM; 1112 1113 old_pvid = br->default_pvid; 1114 1115 /* Update default_pvid config only if we do not conflict with 1116 * user configuration. 1117 */ 1118 vg = br_vlan_group(br); 1119 pvent = br_vlan_find(vg, pvid); 1120 if ((!old_pvid || vlan_default_pvid(vg, old_pvid)) && 1121 (!pvent || !br_vlan_should_use(pvent))) { 1122 err = br_vlan_add(br, pvid, 1123 BRIDGE_VLAN_INFO_PVID | 1124 BRIDGE_VLAN_INFO_UNTAGGED | 1125 BRIDGE_VLAN_INFO_BRENTRY, 1126 &vlchange, extack); 1127 if (err) 1128 goto out; 1129 1130 if (br_vlan_delete(br, old_pvid)) 1131 br_vlan_notify(br, NULL, old_pvid, 0, RTM_DELVLAN); 1132 br_vlan_notify(br, NULL, pvid, 0, RTM_NEWVLAN); 1133 __set_bit(0, changed); 1134 } 1135 1136 list_for_each_entry(p, &br->port_list, list) { 1137 /* Update default_pvid config only if we do not conflict with 1138 * user configuration. 1139 */ 1140 vg = nbp_vlan_group(p); 1141 if ((old_pvid && 1142 !vlan_default_pvid(vg, old_pvid)) || 1143 br_vlan_find(vg, pvid)) 1144 continue; 1145 1146 err = nbp_vlan_add(p, pvid, 1147 BRIDGE_VLAN_INFO_PVID | 1148 BRIDGE_VLAN_INFO_UNTAGGED, 1149 &vlchange, extack); 1150 if (err) 1151 goto err_port; 1152 if (nbp_vlan_delete(p, old_pvid)) 1153 br_vlan_notify(br, p, old_pvid, 0, RTM_DELVLAN); 1154 br_vlan_notify(p->br, p, pvid, 0, RTM_NEWVLAN); 1155 __set_bit(p->port_no, changed); 1156 } 1157 1158 br->default_pvid = pvid; 1159 1160 out: 1161 bitmap_free(changed); 1162 return err; 1163 1164 err_port: 1165 list_for_each_entry_continue_reverse(p, &br->port_list, list) { 1166 if (!test_bit(p->port_no, changed)) 1167 continue; 1168 1169 if (old_pvid) { 1170 nbp_vlan_add(p, old_pvid, 1171 BRIDGE_VLAN_INFO_PVID | 1172 BRIDGE_VLAN_INFO_UNTAGGED, 1173 &vlchange, NULL); 1174 br_vlan_notify(p->br, p, old_pvid, 0, RTM_NEWVLAN); 1175 } 1176 nbp_vlan_delete(p, pvid); 1177 br_vlan_notify(br, p, pvid, 0, RTM_DELVLAN); 1178 } 1179 1180 if (test_bit(0, changed)) { 1181 if (old_pvid) { 1182 br_vlan_add(br, old_pvid, 1183 BRIDGE_VLAN_INFO_PVID | 1184 BRIDGE_VLAN_INFO_UNTAGGED | 1185 BRIDGE_VLAN_INFO_BRENTRY, 1186 &vlchange, NULL); 1187 br_vlan_notify(br, NULL, old_pvid, 0, RTM_NEWVLAN); 1188 } 1189 br_vlan_delete(br, pvid); 1190 br_vlan_notify(br, NULL, pvid, 0, RTM_DELVLAN); 1191 } 1192 goto out; 1193 } 1194 1195 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val, 1196 struct netlink_ext_ack *extack) 1197 { 1198 u16 pvid = val; 1199 int err = 0; 1200 1201 if (val >= VLAN_VID_MASK) 1202 return -EINVAL; 1203 1204 if (pvid == br->default_pvid) 1205 goto out; 1206 1207 /* Only allow default pvid change when filtering is disabled */ 1208 if (br_opt_get(br, BROPT_VLAN_ENABLED)) { 1209 pr_info_once("Please disable vlan filtering to change default_pvid\n"); 1210 err = -EPERM; 1211 goto out; 1212 } 1213 err = __br_vlan_set_default_pvid(br, pvid, extack); 1214 out: 1215 return err; 1216 } 1217 1218 int br_vlan_init(struct net_bridge *br) 1219 { 1220 struct net_bridge_vlan_group *vg; 1221 int ret = -ENOMEM; 1222 1223 vg = kzalloc(sizeof(*vg), GFP_KERNEL); 1224 if (!vg) 1225 goto out; 1226 ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params); 1227 if (ret) 1228 goto err_rhtbl; 1229 ret = vlan_tunnel_init(vg); 1230 if (ret) 1231 goto err_tunnel_init; 1232 INIT_LIST_HEAD(&vg->vlan_list); 1233 br->vlan_proto = htons(ETH_P_8021Q); 1234 br->default_pvid = 1; 1235 rcu_assign_pointer(br->vlgrp, vg); 1236 1237 out: 1238 return ret; 1239 1240 err_tunnel_init: 1241 rhashtable_destroy(&vg->vlan_hash); 1242 err_rhtbl: 1243 kfree(vg); 1244 1245 goto out; 1246 } 1247 1248 int nbp_vlan_init(struct net_bridge_port *p, struct netlink_ext_ack *extack) 1249 { 1250 struct switchdev_attr attr = { 1251 .orig_dev = p->br->dev, 1252 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING, 1253 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP, 1254 .u.vlan_filtering = br_opt_get(p->br, BROPT_VLAN_ENABLED), 1255 }; 1256 struct net_bridge_vlan_group *vg; 1257 int ret = -ENOMEM; 1258 1259 vg = kzalloc(sizeof(struct net_bridge_vlan_group), GFP_KERNEL); 1260 if (!vg) 1261 goto out; 1262 1263 ret = switchdev_port_attr_set(p->dev, &attr, extack); 1264 if (ret && ret != -EOPNOTSUPP) 1265 goto err_vlan_enabled; 1266 1267 ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params); 1268 if (ret) 1269 goto err_rhtbl; 1270 ret = vlan_tunnel_init(vg); 1271 if (ret) 1272 goto err_tunnel_init; 1273 INIT_LIST_HEAD(&vg->vlan_list); 1274 rcu_assign_pointer(p->vlgrp, vg); 1275 if (p->br->default_pvid) { 1276 bool changed; 1277 1278 ret = nbp_vlan_add(p, p->br->default_pvid, 1279 BRIDGE_VLAN_INFO_PVID | 1280 BRIDGE_VLAN_INFO_UNTAGGED, 1281 &changed, extack); 1282 if (ret) 1283 goto err_vlan_add; 1284 br_vlan_notify(p->br, p, p->br->default_pvid, 0, RTM_NEWVLAN); 1285 } 1286 out: 1287 return ret; 1288 1289 err_vlan_add: 1290 RCU_INIT_POINTER(p->vlgrp, NULL); 1291 synchronize_rcu(); 1292 vlan_tunnel_deinit(vg); 1293 err_tunnel_init: 1294 rhashtable_destroy(&vg->vlan_hash); 1295 err_rhtbl: 1296 err_vlan_enabled: 1297 kfree(vg); 1298 1299 goto out; 1300 } 1301 1302 /* Must be protected by RTNL. 1303 * Must be called with vid in range from 1 to 4094 inclusive. 1304 * changed must be true only if the vlan was created or updated 1305 */ 1306 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags, 1307 bool *changed, struct netlink_ext_ack *extack) 1308 { 1309 struct net_bridge_vlan *vlan; 1310 int ret; 1311 1312 ASSERT_RTNL(); 1313 1314 *changed = false; 1315 vlan = br_vlan_find(nbp_vlan_group(port), vid); 1316 if (vlan) { 1317 bool would_change = __vlan_flags_would_change(vlan, flags); 1318 1319 if (would_change) { 1320 /* Pass the flags to the hardware bridge */ 1321 ret = br_switchdev_port_vlan_add(port->dev, vid, flags, 1322 true, extack); 1323 if (ret && ret != -EOPNOTSUPP) 1324 return ret; 1325 } 1326 1327 __vlan_flags_commit(vlan, flags); 1328 *changed = would_change; 1329 1330 return 0; 1331 } 1332 1333 vlan = kzalloc(sizeof(*vlan), GFP_KERNEL); 1334 if (!vlan) 1335 return -ENOMEM; 1336 1337 vlan->vid = vid; 1338 vlan->port = port; 1339 ret = __vlan_add(vlan, flags, extack); 1340 if (ret) 1341 kfree(vlan); 1342 else 1343 *changed = true; 1344 1345 return ret; 1346 } 1347 1348 /* Must be protected by RTNL. 1349 * Must be called with vid in range from 1 to 4094 inclusive. 1350 */ 1351 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid) 1352 { 1353 struct net_bridge_vlan *v; 1354 1355 ASSERT_RTNL(); 1356 1357 v = br_vlan_find(nbp_vlan_group(port), vid); 1358 if (!v) 1359 return -ENOENT; 1360 br_fdb_find_delete_local(port->br, port, port->dev->dev_addr, vid); 1361 br_fdb_delete_by_port(port->br, port, vid, 0); 1362 1363 return __vlan_del(v); 1364 } 1365 1366 void nbp_vlan_flush(struct net_bridge_port *port) 1367 { 1368 struct net_bridge_vlan_group *vg; 1369 1370 ASSERT_RTNL(); 1371 1372 vg = nbp_vlan_group(port); 1373 __vlan_flush(port->br, port, vg); 1374 RCU_INIT_POINTER(port->vlgrp, NULL); 1375 synchronize_rcu(); 1376 __vlan_group_free(vg); 1377 } 1378 1379 void br_vlan_get_stats(const struct net_bridge_vlan *v, 1380 struct pcpu_sw_netstats *stats) 1381 { 1382 int i; 1383 1384 memset(stats, 0, sizeof(*stats)); 1385 for_each_possible_cpu(i) { 1386 u64 rxpackets, rxbytes, txpackets, txbytes; 1387 struct pcpu_sw_netstats *cpu_stats; 1388 unsigned int start; 1389 1390 cpu_stats = per_cpu_ptr(v->stats, i); 1391 do { 1392 start = u64_stats_fetch_begin(&cpu_stats->syncp); 1393 rxpackets = u64_stats_read(&cpu_stats->rx_packets); 1394 rxbytes = u64_stats_read(&cpu_stats->rx_bytes); 1395 txbytes = u64_stats_read(&cpu_stats->tx_bytes); 1396 txpackets = u64_stats_read(&cpu_stats->tx_packets); 1397 } while (u64_stats_fetch_retry(&cpu_stats->syncp, start)); 1398 1399 u64_stats_add(&stats->rx_packets, rxpackets); 1400 u64_stats_add(&stats->rx_bytes, rxbytes); 1401 u64_stats_add(&stats->tx_bytes, txbytes); 1402 u64_stats_add(&stats->tx_packets, txpackets); 1403 } 1404 } 1405 1406 int br_vlan_get_pvid(const struct net_device *dev, u16 *p_pvid) 1407 { 1408 struct net_bridge_vlan_group *vg; 1409 struct net_bridge_port *p; 1410 1411 ASSERT_RTNL(); 1412 p = br_port_get_check_rtnl(dev); 1413 if (p) 1414 vg = nbp_vlan_group(p); 1415 else if (netif_is_bridge_master(dev)) 1416 vg = br_vlan_group(netdev_priv(dev)); 1417 else 1418 return -EINVAL; 1419 1420 *p_pvid = br_get_pvid(vg); 1421 return 0; 1422 } 1423 EXPORT_SYMBOL_GPL(br_vlan_get_pvid); 1424 1425 int br_vlan_get_pvid_rcu(const struct net_device *dev, u16 *p_pvid) 1426 { 1427 struct net_bridge_vlan_group *vg; 1428 struct net_bridge_port *p; 1429 1430 p = br_port_get_check_rcu(dev); 1431 if (p) 1432 vg = nbp_vlan_group_rcu(p); 1433 else if (netif_is_bridge_master(dev)) 1434 vg = br_vlan_group_rcu(netdev_priv(dev)); 1435 else 1436 return -EINVAL; 1437 1438 *p_pvid = br_get_pvid(vg); 1439 return 0; 1440 } 1441 EXPORT_SYMBOL_GPL(br_vlan_get_pvid_rcu); 1442 1443 void br_vlan_fill_forward_path_pvid(struct net_bridge *br, 1444 struct net_device_path_ctx *ctx, 1445 struct net_device_path *path) 1446 { 1447 struct net_bridge_vlan_group *vg; 1448 int idx = ctx->num_vlans - 1; 1449 u16 vid; 1450 1451 path->bridge.vlan_mode = DEV_PATH_BR_VLAN_KEEP; 1452 1453 if (!br_opt_get(br, BROPT_VLAN_ENABLED)) 1454 return; 1455 1456 vg = br_vlan_group(br); 1457 1458 if (idx >= 0 && 1459 ctx->vlan[idx].proto == br->vlan_proto) { 1460 vid = ctx->vlan[idx].id; 1461 } else { 1462 path->bridge.vlan_mode = DEV_PATH_BR_VLAN_TAG; 1463 vid = br_get_pvid(vg); 1464 } 1465 1466 path->bridge.vlan_id = vid; 1467 path->bridge.vlan_proto = br->vlan_proto; 1468 } 1469 1470 int br_vlan_fill_forward_path_mode(struct net_bridge *br, 1471 struct net_bridge_port *dst, 1472 struct net_device_path *path) 1473 { 1474 struct net_bridge_vlan_group *vg; 1475 struct net_bridge_vlan *v; 1476 1477 if (!br_opt_get(br, BROPT_VLAN_ENABLED)) 1478 return 0; 1479 1480 vg = nbp_vlan_group_rcu(dst); 1481 v = br_vlan_find(vg, path->bridge.vlan_id); 1482 if (!v || !br_vlan_should_use(v)) 1483 return -EINVAL; 1484 1485 if (!(v->flags & BRIDGE_VLAN_INFO_UNTAGGED)) 1486 return 0; 1487 1488 if (path->bridge.vlan_mode == DEV_PATH_BR_VLAN_TAG) 1489 path->bridge.vlan_mode = DEV_PATH_BR_VLAN_KEEP; 1490 else if (v->priv_flags & BR_VLFLAG_ADDED_BY_SWITCHDEV) 1491 path->bridge.vlan_mode = DEV_PATH_BR_VLAN_UNTAG_HW; 1492 else 1493 path->bridge.vlan_mode = DEV_PATH_BR_VLAN_UNTAG; 1494 1495 return 0; 1496 } 1497 1498 int br_vlan_get_info(const struct net_device *dev, u16 vid, 1499 struct bridge_vlan_info *p_vinfo) 1500 { 1501 struct net_bridge_vlan_group *vg; 1502 struct net_bridge_vlan *v; 1503 struct net_bridge_port *p; 1504 1505 ASSERT_RTNL(); 1506 p = br_port_get_check_rtnl(dev); 1507 if (p) 1508 vg = nbp_vlan_group(p); 1509 else if (netif_is_bridge_master(dev)) 1510 vg = br_vlan_group(netdev_priv(dev)); 1511 else 1512 return -EINVAL; 1513 1514 v = br_vlan_find(vg, vid); 1515 if (!v) 1516 return -ENOENT; 1517 1518 p_vinfo->vid = vid; 1519 p_vinfo->flags = v->flags; 1520 if (vid == br_get_pvid(vg)) 1521 p_vinfo->flags |= BRIDGE_VLAN_INFO_PVID; 1522 return 0; 1523 } 1524 EXPORT_SYMBOL_GPL(br_vlan_get_info); 1525 1526 int br_vlan_get_info_rcu(const struct net_device *dev, u16 vid, 1527 struct bridge_vlan_info *p_vinfo) 1528 { 1529 struct net_bridge_vlan_group *vg; 1530 struct net_bridge_vlan *v; 1531 struct net_bridge_port *p; 1532 1533 p = br_port_get_check_rcu(dev); 1534 if (p) 1535 vg = nbp_vlan_group_rcu(p); 1536 else if (netif_is_bridge_master(dev)) 1537 vg = br_vlan_group_rcu(netdev_priv(dev)); 1538 else 1539 return -EINVAL; 1540 1541 v = br_vlan_find(vg, vid); 1542 if (!v) 1543 return -ENOENT; 1544 1545 p_vinfo->vid = vid; 1546 p_vinfo->flags = v->flags; 1547 if (vid == br_get_pvid(vg)) 1548 p_vinfo->flags |= BRIDGE_VLAN_INFO_PVID; 1549 return 0; 1550 } 1551 EXPORT_SYMBOL_GPL(br_vlan_get_info_rcu); 1552 1553 static int br_vlan_is_bind_vlan_dev(const struct net_device *dev) 1554 { 1555 return is_vlan_dev(dev) && 1556 !!(vlan_dev_priv(dev)->flags & VLAN_FLAG_BRIDGE_BINDING); 1557 } 1558 1559 static int br_vlan_is_bind_vlan_dev_fn(struct net_device *dev, 1560 __always_unused struct netdev_nested_priv *priv) 1561 { 1562 return br_vlan_is_bind_vlan_dev(dev); 1563 } 1564 1565 static bool br_vlan_has_upper_bind_vlan_dev(struct net_device *dev) 1566 { 1567 int found; 1568 1569 rcu_read_lock(); 1570 found = netdev_walk_all_upper_dev_rcu(dev, br_vlan_is_bind_vlan_dev_fn, 1571 NULL); 1572 rcu_read_unlock(); 1573 1574 return !!found; 1575 } 1576 1577 struct br_vlan_bind_walk_data { 1578 u16 vid; 1579 struct net_device *result; 1580 }; 1581 1582 static int br_vlan_match_bind_vlan_dev_fn(struct net_device *dev, 1583 struct netdev_nested_priv *priv) 1584 { 1585 struct br_vlan_bind_walk_data *data = priv->data; 1586 int found = 0; 1587 1588 if (br_vlan_is_bind_vlan_dev(dev) && 1589 vlan_dev_priv(dev)->vlan_id == data->vid) { 1590 data->result = dev; 1591 found = 1; 1592 } 1593 1594 return found; 1595 } 1596 1597 static struct net_device * 1598 br_vlan_get_upper_bind_vlan_dev(struct net_device *dev, u16 vid) 1599 { 1600 struct br_vlan_bind_walk_data data = { 1601 .vid = vid, 1602 }; 1603 struct netdev_nested_priv priv = { 1604 .data = (void *)&data, 1605 }; 1606 1607 rcu_read_lock(); 1608 netdev_walk_all_upper_dev_rcu(dev, br_vlan_match_bind_vlan_dev_fn, 1609 &priv); 1610 rcu_read_unlock(); 1611 1612 return data.result; 1613 } 1614 1615 static bool br_vlan_is_dev_up(const struct net_device *dev) 1616 { 1617 return !!(dev->flags & IFF_UP) && netif_oper_up(dev); 1618 } 1619 1620 static void br_vlan_set_vlan_dev_state(const struct net_bridge *br, 1621 struct net_device *vlan_dev) 1622 { 1623 u16 vid = vlan_dev_priv(vlan_dev)->vlan_id; 1624 struct net_bridge_vlan_group *vg; 1625 struct net_bridge_port *p; 1626 bool has_carrier = false; 1627 1628 if (!netif_carrier_ok(br->dev)) { 1629 netif_carrier_off(vlan_dev); 1630 return; 1631 } 1632 1633 list_for_each_entry(p, &br->port_list, list) { 1634 vg = nbp_vlan_group(p); 1635 if (br_vlan_find(vg, vid) && br_vlan_is_dev_up(p->dev)) { 1636 has_carrier = true; 1637 break; 1638 } 1639 } 1640 1641 if (has_carrier) 1642 netif_carrier_on(vlan_dev); 1643 else 1644 netif_carrier_off(vlan_dev); 1645 } 1646 1647 static void br_vlan_set_all_vlan_dev_state(struct net_bridge_port *p) 1648 { 1649 struct net_bridge_vlan_group *vg = nbp_vlan_group(p); 1650 struct net_bridge_vlan *vlan; 1651 struct net_device *vlan_dev; 1652 1653 list_for_each_entry(vlan, &vg->vlan_list, vlist) { 1654 vlan_dev = br_vlan_get_upper_bind_vlan_dev(p->br->dev, 1655 vlan->vid); 1656 if (vlan_dev) { 1657 if (br_vlan_is_dev_up(p->dev)) { 1658 if (netif_carrier_ok(p->br->dev)) 1659 netif_carrier_on(vlan_dev); 1660 } else { 1661 br_vlan_set_vlan_dev_state(p->br, vlan_dev); 1662 } 1663 } 1664 } 1665 } 1666 1667 static void br_vlan_upper_change(struct net_device *dev, 1668 struct net_device *upper_dev, 1669 bool linking) 1670 { 1671 struct net_bridge *br = netdev_priv(dev); 1672 1673 if (!br_vlan_is_bind_vlan_dev(upper_dev)) 1674 return; 1675 1676 if (linking) { 1677 br_vlan_set_vlan_dev_state(br, upper_dev); 1678 br_opt_toggle(br, BROPT_VLAN_BRIDGE_BINDING, true); 1679 } else { 1680 br_opt_toggle(br, BROPT_VLAN_BRIDGE_BINDING, 1681 br_vlan_has_upper_bind_vlan_dev(dev)); 1682 } 1683 } 1684 1685 struct br_vlan_link_state_walk_data { 1686 struct net_bridge *br; 1687 }; 1688 1689 static int br_vlan_link_state_change_fn(struct net_device *vlan_dev, 1690 struct netdev_nested_priv *priv) 1691 { 1692 struct br_vlan_link_state_walk_data *data = priv->data; 1693 1694 if (br_vlan_is_bind_vlan_dev(vlan_dev)) 1695 br_vlan_set_vlan_dev_state(data->br, vlan_dev); 1696 1697 return 0; 1698 } 1699 1700 static void br_vlan_link_state_change(struct net_device *dev, 1701 struct net_bridge *br) 1702 { 1703 struct br_vlan_link_state_walk_data data = { 1704 .br = br 1705 }; 1706 struct netdev_nested_priv priv = { 1707 .data = (void *)&data, 1708 }; 1709 1710 rcu_read_lock(); 1711 netdev_walk_all_upper_dev_rcu(dev, br_vlan_link_state_change_fn, 1712 &priv); 1713 rcu_read_unlock(); 1714 } 1715 1716 /* Must be protected by RTNL. */ 1717 static void nbp_vlan_set_vlan_dev_state(struct net_bridge_port *p, u16 vid) 1718 { 1719 struct net_device *vlan_dev; 1720 1721 if (!br_opt_get(p->br, BROPT_VLAN_BRIDGE_BINDING)) 1722 return; 1723 1724 vlan_dev = br_vlan_get_upper_bind_vlan_dev(p->br->dev, vid); 1725 if (vlan_dev) 1726 br_vlan_set_vlan_dev_state(p->br, vlan_dev); 1727 } 1728 1729 /* Must be protected by RTNL. */ 1730 int br_vlan_bridge_event(struct net_device *dev, unsigned long event, void *ptr) 1731 { 1732 struct netdev_notifier_changeupper_info *info; 1733 struct net_bridge *br = netdev_priv(dev); 1734 int vlcmd = 0, ret = 0; 1735 bool changed = false; 1736 1737 switch (event) { 1738 case NETDEV_REGISTER: 1739 ret = br_vlan_add(br, br->default_pvid, 1740 BRIDGE_VLAN_INFO_PVID | 1741 BRIDGE_VLAN_INFO_UNTAGGED | 1742 BRIDGE_VLAN_INFO_BRENTRY, &changed, NULL); 1743 vlcmd = RTM_NEWVLAN; 1744 break; 1745 case NETDEV_UNREGISTER: 1746 changed = !br_vlan_delete(br, br->default_pvid); 1747 vlcmd = RTM_DELVLAN; 1748 break; 1749 case NETDEV_CHANGEUPPER: 1750 info = ptr; 1751 br_vlan_upper_change(dev, info->upper_dev, info->linking); 1752 break; 1753 1754 case NETDEV_CHANGE: 1755 case NETDEV_UP: 1756 if (!br_opt_get(br, BROPT_VLAN_BRIDGE_BINDING)) 1757 break; 1758 br_vlan_link_state_change(dev, br); 1759 break; 1760 } 1761 if (changed) 1762 br_vlan_notify(br, NULL, br->default_pvid, 0, vlcmd); 1763 1764 return ret; 1765 } 1766 1767 /* Must be protected by RTNL. */ 1768 void br_vlan_port_event(struct net_bridge_port *p, unsigned long event) 1769 { 1770 if (!br_opt_get(p->br, BROPT_VLAN_BRIDGE_BINDING)) 1771 return; 1772 1773 switch (event) { 1774 case NETDEV_CHANGE: 1775 case NETDEV_DOWN: 1776 case NETDEV_UP: 1777 br_vlan_set_all_vlan_dev_state(p); 1778 break; 1779 } 1780 } 1781 1782 static bool br_vlan_stats_fill(struct sk_buff *skb, 1783 const struct net_bridge_vlan *v) 1784 { 1785 struct pcpu_sw_netstats stats; 1786 struct nlattr *nest; 1787 1788 nest = nla_nest_start(skb, BRIDGE_VLANDB_ENTRY_STATS); 1789 if (!nest) 1790 return false; 1791 1792 br_vlan_get_stats(v, &stats); 1793 if (nla_put_u64_64bit(skb, BRIDGE_VLANDB_STATS_RX_BYTES, 1794 u64_stats_read(&stats.rx_bytes), 1795 BRIDGE_VLANDB_STATS_PAD) || 1796 nla_put_u64_64bit(skb, BRIDGE_VLANDB_STATS_RX_PACKETS, 1797 u64_stats_read(&stats.rx_packets), 1798 BRIDGE_VLANDB_STATS_PAD) || 1799 nla_put_u64_64bit(skb, BRIDGE_VLANDB_STATS_TX_BYTES, 1800 u64_stats_read(&stats.tx_bytes), 1801 BRIDGE_VLANDB_STATS_PAD) || 1802 nla_put_u64_64bit(skb, BRIDGE_VLANDB_STATS_TX_PACKETS, 1803 u64_stats_read(&stats.tx_packets), 1804 BRIDGE_VLANDB_STATS_PAD)) 1805 goto out_err; 1806 1807 nla_nest_end(skb, nest); 1808 1809 return true; 1810 1811 out_err: 1812 nla_nest_cancel(skb, nest); 1813 return false; 1814 } 1815 1816 /* v_opts is used to dump the options which must be equal in the whole range */ 1817 static bool br_vlan_fill_vids(struct sk_buff *skb, u16 vid, u16 vid_range, 1818 const struct net_bridge_vlan *v_opts, 1819 const struct net_bridge_port *p, 1820 u16 flags, 1821 bool dump_stats) 1822 { 1823 struct bridge_vlan_info info; 1824 struct nlattr *nest; 1825 1826 nest = nla_nest_start(skb, BRIDGE_VLANDB_ENTRY); 1827 if (!nest) 1828 return false; 1829 1830 memset(&info, 0, sizeof(info)); 1831 info.vid = vid; 1832 if (flags & BRIDGE_VLAN_INFO_UNTAGGED) 1833 info.flags |= BRIDGE_VLAN_INFO_UNTAGGED; 1834 if (flags & BRIDGE_VLAN_INFO_PVID) 1835 info.flags |= BRIDGE_VLAN_INFO_PVID; 1836 1837 if (nla_put(skb, BRIDGE_VLANDB_ENTRY_INFO, sizeof(info), &info)) 1838 goto out_err; 1839 1840 if (vid_range && vid < vid_range && 1841 !(flags & BRIDGE_VLAN_INFO_PVID) && 1842 nla_put_u16(skb, BRIDGE_VLANDB_ENTRY_RANGE, vid_range)) 1843 goto out_err; 1844 1845 if (v_opts) { 1846 if (!br_vlan_opts_fill(skb, v_opts, p)) 1847 goto out_err; 1848 1849 if (dump_stats && !br_vlan_stats_fill(skb, v_opts)) 1850 goto out_err; 1851 } 1852 1853 nla_nest_end(skb, nest); 1854 1855 return true; 1856 1857 out_err: 1858 nla_nest_cancel(skb, nest); 1859 return false; 1860 } 1861 1862 static size_t rtnl_vlan_nlmsg_size(void) 1863 { 1864 return NLMSG_ALIGN(sizeof(struct br_vlan_msg)) 1865 + nla_total_size(0) /* BRIDGE_VLANDB_ENTRY */ 1866 + nla_total_size(sizeof(u16)) /* BRIDGE_VLANDB_ENTRY_RANGE */ 1867 + nla_total_size(sizeof(struct bridge_vlan_info)) /* BRIDGE_VLANDB_ENTRY_INFO */ 1868 + br_vlan_opts_nl_size(); /* bridge vlan options */ 1869 } 1870 1871 void br_vlan_notify(const struct net_bridge *br, 1872 const struct net_bridge_port *p, 1873 u16 vid, u16 vid_range, 1874 int cmd) 1875 { 1876 struct net_bridge_vlan_group *vg; 1877 struct net_bridge_vlan *v = NULL; 1878 struct br_vlan_msg *bvm; 1879 struct nlmsghdr *nlh; 1880 struct sk_buff *skb; 1881 int err = -ENOBUFS; 1882 struct net *net; 1883 u16 flags = 0; 1884 int ifindex; 1885 1886 /* right now notifications are done only with rtnl held */ 1887 ASSERT_RTNL(); 1888 1889 if (p) { 1890 ifindex = p->dev->ifindex; 1891 vg = nbp_vlan_group(p); 1892 net = dev_net(p->dev); 1893 } else { 1894 ifindex = br->dev->ifindex; 1895 vg = br_vlan_group(br); 1896 net = dev_net(br->dev); 1897 } 1898 1899 skb = nlmsg_new(rtnl_vlan_nlmsg_size(), GFP_KERNEL); 1900 if (!skb) 1901 goto out_err; 1902 1903 err = -EMSGSIZE; 1904 nlh = nlmsg_put(skb, 0, 0, cmd, sizeof(*bvm), 0); 1905 if (!nlh) 1906 goto out_err; 1907 bvm = nlmsg_data(nlh); 1908 memset(bvm, 0, sizeof(*bvm)); 1909 bvm->family = AF_BRIDGE; 1910 bvm->ifindex = ifindex; 1911 1912 switch (cmd) { 1913 case RTM_NEWVLAN: 1914 /* need to find the vlan due to flags/options */ 1915 v = br_vlan_find(vg, vid); 1916 if (!v || !br_vlan_should_use(v)) 1917 goto out_kfree; 1918 1919 flags = v->flags; 1920 if (br_get_pvid(vg) == v->vid) 1921 flags |= BRIDGE_VLAN_INFO_PVID; 1922 break; 1923 case RTM_DELVLAN: 1924 break; 1925 default: 1926 goto out_kfree; 1927 } 1928 1929 if (!br_vlan_fill_vids(skb, vid, vid_range, v, p, flags, false)) 1930 goto out_err; 1931 1932 nlmsg_end(skb, nlh); 1933 rtnl_notify(skb, net, 0, RTNLGRP_BRVLAN, NULL, GFP_KERNEL); 1934 return; 1935 1936 out_err: 1937 rtnl_set_sk_err(net, RTNLGRP_BRVLAN, err); 1938 out_kfree: 1939 kfree_skb(skb); 1940 } 1941 1942 /* check if v_curr can enter a range ending in range_end */ 1943 bool br_vlan_can_enter_range(const struct net_bridge_vlan *v_curr, 1944 const struct net_bridge_vlan *range_end) 1945 { 1946 return v_curr->vid - range_end->vid == 1 && 1947 range_end->flags == v_curr->flags && 1948 br_vlan_opts_eq_range(v_curr, range_end); 1949 } 1950 1951 static int br_vlan_dump_dev(const struct net_device *dev, 1952 struct sk_buff *skb, 1953 struct netlink_callback *cb, 1954 u32 dump_flags) 1955 { 1956 struct net_bridge_vlan *v, *range_start = NULL, *range_end = NULL; 1957 bool dump_global = !!(dump_flags & BRIDGE_VLANDB_DUMPF_GLOBAL); 1958 bool dump_stats = !!(dump_flags & BRIDGE_VLANDB_DUMPF_STATS); 1959 struct net_bridge_vlan_group *vg; 1960 int idx = 0, s_idx = cb->args[1]; 1961 struct nlmsghdr *nlh = NULL; 1962 struct net_bridge_port *p; 1963 struct br_vlan_msg *bvm; 1964 struct net_bridge *br; 1965 int err = 0; 1966 u16 pvid; 1967 1968 if (!netif_is_bridge_master(dev) && !netif_is_bridge_port(dev)) 1969 return -EINVAL; 1970 1971 if (netif_is_bridge_master(dev)) { 1972 br = netdev_priv(dev); 1973 vg = br_vlan_group_rcu(br); 1974 p = NULL; 1975 } else { 1976 /* global options are dumped only for bridge devices */ 1977 if (dump_global) 1978 return 0; 1979 1980 p = br_port_get_rcu(dev); 1981 if (WARN_ON(!p)) 1982 return -EINVAL; 1983 vg = nbp_vlan_group_rcu(p); 1984 br = p->br; 1985 } 1986 1987 if (!vg) 1988 return 0; 1989 1990 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 1991 RTM_NEWVLAN, sizeof(*bvm), NLM_F_MULTI); 1992 if (!nlh) 1993 return -EMSGSIZE; 1994 bvm = nlmsg_data(nlh); 1995 memset(bvm, 0, sizeof(*bvm)); 1996 bvm->family = PF_BRIDGE; 1997 bvm->ifindex = dev->ifindex; 1998 pvid = br_get_pvid(vg); 1999 2000 /* idx must stay at range's beginning until it is filled in */ 2001 list_for_each_entry_rcu(v, &vg->vlan_list, vlist) { 2002 if (!dump_global && !br_vlan_should_use(v)) 2003 continue; 2004 if (idx < s_idx) { 2005 idx++; 2006 continue; 2007 } 2008 2009 if (!range_start) { 2010 range_start = v; 2011 range_end = v; 2012 continue; 2013 } 2014 2015 if (dump_global) { 2016 if (br_vlan_global_opts_can_enter_range(v, range_end)) 2017 goto update_end; 2018 if (!br_vlan_global_opts_fill(skb, range_start->vid, 2019 range_end->vid, 2020 range_start)) { 2021 err = -EMSGSIZE; 2022 break; 2023 } 2024 /* advance number of filled vlans */ 2025 idx += range_end->vid - range_start->vid + 1; 2026 2027 range_start = v; 2028 } else if (dump_stats || v->vid == pvid || 2029 !br_vlan_can_enter_range(v, range_end)) { 2030 u16 vlan_flags = br_vlan_flags(range_start, pvid); 2031 2032 if (!br_vlan_fill_vids(skb, range_start->vid, 2033 range_end->vid, range_start, 2034 p, vlan_flags, dump_stats)) { 2035 err = -EMSGSIZE; 2036 break; 2037 } 2038 /* advance number of filled vlans */ 2039 idx += range_end->vid - range_start->vid + 1; 2040 2041 range_start = v; 2042 } 2043 update_end: 2044 range_end = v; 2045 } 2046 2047 /* err will be 0 and range_start will be set in 3 cases here: 2048 * - first vlan (range_start == range_end) 2049 * - last vlan (range_start == range_end, not in range) 2050 * - last vlan range (range_start != range_end, in range) 2051 */ 2052 if (!err && range_start) { 2053 if (dump_global && 2054 !br_vlan_global_opts_fill(skb, range_start->vid, 2055 range_end->vid, range_start)) 2056 err = -EMSGSIZE; 2057 else if (!dump_global && 2058 !br_vlan_fill_vids(skb, range_start->vid, 2059 range_end->vid, range_start, 2060 p, br_vlan_flags(range_start, pvid), 2061 dump_stats)) 2062 err = -EMSGSIZE; 2063 } 2064 2065 cb->args[1] = err ? idx : 0; 2066 2067 nlmsg_end(skb, nlh); 2068 2069 return err; 2070 } 2071 2072 static const struct nla_policy br_vlan_db_dump_pol[BRIDGE_VLANDB_DUMP_MAX + 1] = { 2073 [BRIDGE_VLANDB_DUMP_FLAGS] = { .type = NLA_U32 }, 2074 }; 2075 2076 static int br_vlan_rtm_dump(struct sk_buff *skb, struct netlink_callback *cb) 2077 { 2078 struct nlattr *dtb[BRIDGE_VLANDB_DUMP_MAX + 1]; 2079 int idx = 0, err = 0, s_idx = cb->args[0]; 2080 struct net *net = sock_net(skb->sk); 2081 struct br_vlan_msg *bvm; 2082 struct net_device *dev; 2083 u32 dump_flags = 0; 2084 2085 err = nlmsg_parse(cb->nlh, sizeof(*bvm), dtb, BRIDGE_VLANDB_DUMP_MAX, 2086 br_vlan_db_dump_pol, cb->extack); 2087 if (err < 0) 2088 return err; 2089 2090 bvm = nlmsg_data(cb->nlh); 2091 if (dtb[BRIDGE_VLANDB_DUMP_FLAGS]) 2092 dump_flags = nla_get_u32(dtb[BRIDGE_VLANDB_DUMP_FLAGS]); 2093 2094 rcu_read_lock(); 2095 if (bvm->ifindex) { 2096 dev = dev_get_by_index_rcu(net, bvm->ifindex); 2097 if (!dev) { 2098 err = -ENODEV; 2099 goto out_err; 2100 } 2101 err = br_vlan_dump_dev(dev, skb, cb, dump_flags); 2102 /* if the dump completed without an error we return 0 here */ 2103 if (err != -EMSGSIZE) 2104 goto out_err; 2105 } else { 2106 for_each_netdev_rcu(net, dev) { 2107 if (idx < s_idx) 2108 goto skip; 2109 2110 err = br_vlan_dump_dev(dev, skb, cb, dump_flags); 2111 if (err == -EMSGSIZE) 2112 break; 2113 skip: 2114 idx++; 2115 } 2116 } 2117 cb->args[0] = idx; 2118 rcu_read_unlock(); 2119 2120 return skb->len; 2121 2122 out_err: 2123 rcu_read_unlock(); 2124 2125 return err; 2126 } 2127 2128 static const struct nla_policy br_vlan_db_policy[BRIDGE_VLANDB_ENTRY_MAX + 1] = { 2129 [BRIDGE_VLANDB_ENTRY_INFO] = 2130 NLA_POLICY_EXACT_LEN(sizeof(struct bridge_vlan_info)), 2131 [BRIDGE_VLANDB_ENTRY_RANGE] = { .type = NLA_U16 }, 2132 [BRIDGE_VLANDB_ENTRY_STATE] = { .type = NLA_U8 }, 2133 [BRIDGE_VLANDB_ENTRY_TUNNEL_INFO] = { .type = NLA_NESTED }, 2134 [BRIDGE_VLANDB_ENTRY_MCAST_ROUTER] = { .type = NLA_U8 }, 2135 [BRIDGE_VLANDB_ENTRY_MCAST_N_GROUPS] = { .type = NLA_REJECT }, 2136 [BRIDGE_VLANDB_ENTRY_MCAST_MAX_GROUPS] = { .type = NLA_U32 }, 2137 [BRIDGE_VLANDB_ENTRY_NEIGH_SUPPRESS] = NLA_POLICY_MAX(NLA_U8, 1), 2138 }; 2139 2140 static int br_vlan_rtm_process_one(struct net_device *dev, 2141 const struct nlattr *attr, 2142 int cmd, struct netlink_ext_ack *extack) 2143 { 2144 struct bridge_vlan_info *vinfo, vrange_end, *vinfo_last = NULL; 2145 struct nlattr *tb[BRIDGE_VLANDB_ENTRY_MAX + 1]; 2146 bool changed = false, skip_processing = false; 2147 struct net_bridge_vlan_group *vg; 2148 struct net_bridge_port *p = NULL; 2149 int err = 0, cmdmap = 0; 2150 struct net_bridge *br; 2151 2152 if (netif_is_bridge_master(dev)) { 2153 br = netdev_priv(dev); 2154 vg = br_vlan_group(br); 2155 } else { 2156 p = br_port_get_rtnl(dev); 2157 if (WARN_ON(!p)) 2158 return -ENODEV; 2159 br = p->br; 2160 vg = nbp_vlan_group(p); 2161 } 2162 2163 if (WARN_ON(!vg)) 2164 return -ENODEV; 2165 2166 err = nla_parse_nested(tb, BRIDGE_VLANDB_ENTRY_MAX, attr, 2167 br_vlan_db_policy, extack); 2168 if (err) 2169 return err; 2170 2171 if (!tb[BRIDGE_VLANDB_ENTRY_INFO]) { 2172 NL_SET_ERR_MSG_MOD(extack, "Missing vlan entry info"); 2173 return -EINVAL; 2174 } 2175 memset(&vrange_end, 0, sizeof(vrange_end)); 2176 2177 vinfo = nla_data(tb[BRIDGE_VLANDB_ENTRY_INFO]); 2178 if (vinfo->flags & (BRIDGE_VLAN_INFO_RANGE_BEGIN | 2179 BRIDGE_VLAN_INFO_RANGE_END)) { 2180 NL_SET_ERR_MSG_MOD(extack, "Old-style vlan ranges are not allowed when using RTM vlan calls"); 2181 return -EINVAL; 2182 } 2183 if (!br_vlan_valid_id(vinfo->vid, extack)) 2184 return -EINVAL; 2185 2186 if (tb[BRIDGE_VLANDB_ENTRY_RANGE]) { 2187 vrange_end.vid = nla_get_u16(tb[BRIDGE_VLANDB_ENTRY_RANGE]); 2188 /* validate user-provided flags without RANGE_BEGIN */ 2189 vrange_end.flags = BRIDGE_VLAN_INFO_RANGE_END | vinfo->flags; 2190 vinfo->flags |= BRIDGE_VLAN_INFO_RANGE_BEGIN; 2191 2192 /* vinfo_last is the range start, vinfo the range end */ 2193 vinfo_last = vinfo; 2194 vinfo = &vrange_end; 2195 2196 if (!br_vlan_valid_id(vinfo->vid, extack) || 2197 !br_vlan_valid_range(vinfo, vinfo_last, extack)) 2198 return -EINVAL; 2199 } 2200 2201 switch (cmd) { 2202 case RTM_NEWVLAN: 2203 cmdmap = RTM_SETLINK; 2204 skip_processing = !!(vinfo->flags & BRIDGE_VLAN_INFO_ONLY_OPTS); 2205 break; 2206 case RTM_DELVLAN: 2207 cmdmap = RTM_DELLINK; 2208 break; 2209 } 2210 2211 if (!skip_processing) { 2212 struct bridge_vlan_info *tmp_last = vinfo_last; 2213 2214 /* br_process_vlan_info may overwrite vinfo_last */ 2215 err = br_process_vlan_info(br, p, cmdmap, vinfo, &tmp_last, 2216 &changed, extack); 2217 2218 /* notify first if anything changed */ 2219 if (changed) 2220 br_ifinfo_notify(cmdmap, br, p); 2221 2222 if (err) 2223 return err; 2224 } 2225 2226 /* deal with options */ 2227 if (cmd == RTM_NEWVLAN) { 2228 struct net_bridge_vlan *range_start, *range_end; 2229 2230 if (vinfo_last) { 2231 range_start = br_vlan_find(vg, vinfo_last->vid); 2232 range_end = br_vlan_find(vg, vinfo->vid); 2233 } else { 2234 range_start = br_vlan_find(vg, vinfo->vid); 2235 range_end = range_start; 2236 } 2237 2238 err = br_vlan_process_options(br, p, range_start, range_end, 2239 tb, extack); 2240 } 2241 2242 return err; 2243 } 2244 2245 static int br_vlan_rtm_process(struct sk_buff *skb, struct nlmsghdr *nlh, 2246 struct netlink_ext_ack *extack) 2247 { 2248 struct net *net = sock_net(skb->sk); 2249 struct br_vlan_msg *bvm; 2250 struct net_device *dev; 2251 struct nlattr *attr; 2252 int err, vlans = 0; 2253 int rem; 2254 2255 /* this should validate the header and check for remaining bytes */ 2256 err = nlmsg_parse(nlh, sizeof(*bvm), NULL, BRIDGE_VLANDB_MAX, NULL, 2257 extack); 2258 if (err < 0) 2259 return err; 2260 2261 bvm = nlmsg_data(nlh); 2262 dev = __dev_get_by_index(net, bvm->ifindex); 2263 if (!dev) 2264 return -ENODEV; 2265 2266 if (!netif_is_bridge_master(dev) && !netif_is_bridge_port(dev)) { 2267 NL_SET_ERR_MSG_MOD(extack, "The device is not a valid bridge or bridge port"); 2268 return -EINVAL; 2269 } 2270 2271 nlmsg_for_each_attr(attr, nlh, sizeof(*bvm), rem) { 2272 switch (nla_type(attr)) { 2273 case BRIDGE_VLANDB_ENTRY: 2274 err = br_vlan_rtm_process_one(dev, attr, 2275 nlh->nlmsg_type, 2276 extack); 2277 break; 2278 case BRIDGE_VLANDB_GLOBAL_OPTIONS: 2279 err = br_vlan_rtm_process_global_options(dev, attr, 2280 nlh->nlmsg_type, 2281 extack); 2282 break; 2283 default: 2284 continue; 2285 } 2286 2287 vlans++; 2288 if (err) 2289 break; 2290 } 2291 if (!vlans) { 2292 NL_SET_ERR_MSG_MOD(extack, "No vlans found to process"); 2293 err = -EINVAL; 2294 } 2295 2296 return err; 2297 } 2298 2299 void br_vlan_rtnl_init(void) 2300 { 2301 rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_GETVLAN, NULL, 2302 br_vlan_rtm_dump, 0); 2303 rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_NEWVLAN, 2304 br_vlan_rtm_process, NULL, 0); 2305 rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_DELVLAN, 2306 br_vlan_rtm_process, NULL, 0); 2307 } 2308 2309 void br_vlan_rtnl_uninit(void) 2310 { 2311 rtnl_unregister(PF_BRIDGE, RTM_GETVLAN); 2312 rtnl_unregister(PF_BRIDGE, RTM_NEWVLAN); 2313 rtnl_unregister(PF_BRIDGE, RTM_DELVLAN); 2314 } 2315