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 /* This is the shared VLAN add function which works for both ports and bridge 230 * devices. There are four possible calls to this function in terms of the 231 * vlan entry type: 232 * 1. vlan is being added on a port (no master flags, global entry exists) 233 * 2. vlan is being added on a bridge (both master and brentry flags) 234 * 3. vlan is being added on a port, but a global entry didn't exist which 235 * is being created right now (master flag set, brentry flag unset), the 236 * global entry is used for global per-vlan features, but not for filtering 237 * 4. same as 3 but with both master and brentry flags set so the entry 238 * will be used for filtering in both the port and the bridge 239 */ 240 static int __vlan_add(struct net_bridge_vlan *v, u16 flags, 241 struct netlink_ext_ack *extack) 242 { 243 struct net_bridge_vlan *masterv = NULL; 244 struct net_bridge_port *p = NULL; 245 struct net_bridge_vlan_group *vg; 246 struct net_device *dev; 247 struct net_bridge *br; 248 int err; 249 250 if (br_vlan_is_master(v)) { 251 br = v->br; 252 dev = br->dev; 253 vg = br_vlan_group(br); 254 } else { 255 p = v->port; 256 br = p->br; 257 dev = p->dev; 258 vg = nbp_vlan_group(p); 259 } 260 261 if (p) { 262 /* Add VLAN to the device filter if it is supported. 263 * This ensures tagged traffic enters the bridge when 264 * promiscuous mode is disabled by br_manage_promisc(). 265 */ 266 err = __vlan_vid_add(dev, br, v, flags, extack); 267 if (err) 268 goto out; 269 270 /* need to work on the master vlan too */ 271 if (flags & BRIDGE_VLAN_INFO_MASTER) { 272 bool changed; 273 274 err = br_vlan_add(br, v->vid, 275 flags | BRIDGE_VLAN_INFO_BRENTRY, 276 &changed, extack); 277 if (err) 278 goto out_filt; 279 280 if (changed) 281 br_vlan_notify(br, NULL, v->vid, 0, 282 RTM_NEWVLAN); 283 } 284 285 masterv = br_vlan_get_master(br, v->vid, extack); 286 if (!masterv) { 287 err = -ENOMEM; 288 goto out_filt; 289 } 290 v->brvlan = masterv; 291 if (br_opt_get(br, BROPT_VLAN_STATS_PER_PORT)) { 292 v->stats = 293 netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 294 if (!v->stats) { 295 err = -ENOMEM; 296 goto out_filt; 297 } 298 v->priv_flags |= BR_VLFLAG_PER_PORT_STATS; 299 } else { 300 v->stats = masterv->stats; 301 } 302 br_multicast_port_ctx_init(p, v, &v->port_mcast_ctx); 303 } else { 304 if (br_vlan_should_use(v)) { 305 err = br_switchdev_port_vlan_add(dev, v->vid, flags, 306 false, extack); 307 if (err && err != -EOPNOTSUPP) 308 goto out; 309 } 310 br_multicast_ctx_init(br, v, &v->br_mcast_ctx); 311 v->priv_flags |= BR_VLFLAG_GLOBAL_MCAST_ENABLED; 312 } 313 314 /* Add the dev mac and count the vlan only if it's usable */ 315 if (br_vlan_should_use(v)) { 316 err = br_fdb_add_local(br, p, dev->dev_addr, v->vid); 317 if (err) { 318 br_err(br, "failed insert local address into bridge forwarding table\n"); 319 goto out_filt; 320 } 321 vg->num_vlans++; 322 } 323 324 /* set the state before publishing */ 325 v->state = BR_STATE_FORWARDING; 326 327 err = rhashtable_lookup_insert_fast(&vg->vlan_hash, &v->vnode, 328 br_vlan_rht_params); 329 if (err) 330 goto out_fdb_insert; 331 332 __vlan_add_list(v); 333 __vlan_flags_commit(v, flags); 334 br_multicast_toggle_one_vlan(v, true); 335 336 if (p) 337 nbp_vlan_set_vlan_dev_state(p, v->vid); 338 out: 339 return err; 340 341 out_fdb_insert: 342 if (br_vlan_should_use(v)) { 343 br_fdb_find_delete_local(br, p, dev->dev_addr, v->vid); 344 vg->num_vlans--; 345 } 346 347 out_filt: 348 if (p) { 349 __vlan_vid_del(dev, br, v); 350 if (masterv) { 351 if (v->stats && masterv->stats != v->stats) 352 free_percpu(v->stats); 353 v->stats = NULL; 354 355 br_vlan_put_master(masterv); 356 v->brvlan = NULL; 357 } 358 } else { 359 br_switchdev_port_vlan_del(dev, v->vid); 360 } 361 362 goto out; 363 } 364 365 static int __vlan_del(struct net_bridge_vlan *v) 366 { 367 struct net_bridge_vlan *masterv = v; 368 struct net_bridge_vlan_group *vg; 369 struct net_bridge_port *p = NULL; 370 int err = 0; 371 372 if (br_vlan_is_master(v)) { 373 vg = br_vlan_group(v->br); 374 } else { 375 p = v->port; 376 vg = nbp_vlan_group(v->port); 377 masterv = v->brvlan; 378 } 379 380 __vlan_delete_pvid(vg, v->vid); 381 if (p) { 382 err = __vlan_vid_del(p->dev, p->br, v); 383 if (err) 384 goto out; 385 } else { 386 err = br_switchdev_port_vlan_del(v->br->dev, v->vid); 387 if (err && err != -EOPNOTSUPP) 388 goto out; 389 err = 0; 390 } 391 392 if (br_vlan_should_use(v)) { 393 v->flags &= ~BRIDGE_VLAN_INFO_BRENTRY; 394 vg->num_vlans--; 395 } 396 397 if (masterv != v) { 398 vlan_tunnel_info_del(vg, v); 399 rhashtable_remove_fast(&vg->vlan_hash, &v->vnode, 400 br_vlan_rht_params); 401 __vlan_del_list(v); 402 nbp_vlan_set_vlan_dev_state(p, v->vid); 403 br_multicast_toggle_one_vlan(v, false); 404 br_multicast_port_ctx_deinit(&v->port_mcast_ctx); 405 call_rcu(&v->rcu, nbp_vlan_rcu_free); 406 } 407 408 br_vlan_put_master(masterv); 409 out: 410 return err; 411 } 412 413 static void __vlan_group_free(struct net_bridge_vlan_group *vg) 414 { 415 WARN_ON(!list_empty(&vg->vlan_list)); 416 rhashtable_destroy(&vg->vlan_hash); 417 vlan_tunnel_deinit(vg); 418 kfree(vg); 419 } 420 421 static void __vlan_flush(const struct net_bridge *br, 422 const struct net_bridge_port *p, 423 struct net_bridge_vlan_group *vg) 424 { 425 struct net_bridge_vlan *vlan, *tmp; 426 u16 v_start = 0, v_end = 0; 427 int err; 428 429 __vlan_delete_pvid(vg, vg->pvid); 430 list_for_each_entry_safe(vlan, tmp, &vg->vlan_list, vlist) { 431 /* take care of disjoint ranges */ 432 if (!v_start) { 433 v_start = vlan->vid; 434 } else if (vlan->vid - v_end != 1) { 435 /* found range end, notify and start next one */ 436 br_vlan_notify(br, p, v_start, v_end, RTM_DELVLAN); 437 v_start = vlan->vid; 438 } 439 v_end = vlan->vid; 440 441 err = __vlan_del(vlan); 442 if (err) { 443 br_err(br, 444 "port %u(%s) failed to delete vlan %d: %pe\n", 445 (unsigned int) p->port_no, p->dev->name, 446 vlan->vid, ERR_PTR(err)); 447 } 448 } 449 450 /* notify about the last/whole vlan range */ 451 if (v_start) 452 br_vlan_notify(br, p, v_start, v_end, RTM_DELVLAN); 453 } 454 455 struct sk_buff *br_handle_vlan(struct net_bridge *br, 456 const struct net_bridge_port *p, 457 struct net_bridge_vlan_group *vg, 458 struct sk_buff *skb) 459 { 460 struct pcpu_sw_netstats *stats; 461 struct net_bridge_vlan *v; 462 u16 vid; 463 464 /* If this packet was not filtered at input, let it pass */ 465 if (!BR_INPUT_SKB_CB(skb)->vlan_filtered) 466 goto out; 467 468 /* At this point, we know that the frame was filtered and contains 469 * a valid vlan id. If the vlan id has untagged flag set, 470 * send untagged; otherwise, send tagged. 471 */ 472 br_vlan_get_tag(skb, &vid); 473 v = br_vlan_find(vg, vid); 474 /* Vlan entry must be configured at this point. The 475 * only exception is the bridge is set in promisc mode and the 476 * packet is destined for the bridge device. In this case 477 * pass the packet as is. 478 */ 479 if (!v || !br_vlan_should_use(v)) { 480 if ((br->dev->flags & IFF_PROMISC) && skb->dev == br->dev) { 481 goto out; 482 } else { 483 kfree_skb(skb); 484 return NULL; 485 } 486 } 487 if (br_opt_get(br, BROPT_VLAN_STATS_ENABLED)) { 488 stats = this_cpu_ptr(v->stats); 489 u64_stats_update_begin(&stats->syncp); 490 stats->tx_bytes += skb->len; 491 stats->tx_packets++; 492 u64_stats_update_end(&stats->syncp); 493 } 494 495 /* If the skb will be sent using forwarding offload, the assumption is 496 * that the switchdev will inject the packet into hardware together 497 * with the bridge VLAN, so that it can be forwarded according to that 498 * VLAN. The switchdev should deal with popping the VLAN header in 499 * hardware on each egress port as appropriate. So only strip the VLAN 500 * header if forwarding offload is not being used. 501 */ 502 if (v->flags & BRIDGE_VLAN_INFO_UNTAGGED && 503 !br_switchdev_frame_uses_tx_fwd_offload(skb)) 504 __vlan_hwaccel_clear_tag(skb); 505 506 if (p && (p->flags & BR_VLAN_TUNNEL) && 507 br_handle_egress_vlan_tunnel(skb, v)) { 508 kfree_skb(skb); 509 return NULL; 510 } 511 out: 512 return skb; 513 } 514 515 /* Called under RCU */ 516 static bool __allowed_ingress(const struct net_bridge *br, 517 struct net_bridge_vlan_group *vg, 518 struct sk_buff *skb, u16 *vid, 519 u8 *state, 520 struct net_bridge_vlan **vlan) 521 { 522 struct pcpu_sw_netstats *stats; 523 struct net_bridge_vlan *v; 524 bool tagged; 525 526 BR_INPUT_SKB_CB(skb)->vlan_filtered = true; 527 /* If vlan tx offload is disabled on bridge device and frame was 528 * sent from vlan device on the bridge device, it does not have 529 * HW accelerated vlan tag. 530 */ 531 if (unlikely(!skb_vlan_tag_present(skb) && 532 skb->protocol == br->vlan_proto)) { 533 skb = skb_vlan_untag(skb); 534 if (unlikely(!skb)) 535 return false; 536 } 537 538 if (!br_vlan_get_tag(skb, vid)) { 539 /* Tagged frame */ 540 if (skb->vlan_proto != br->vlan_proto) { 541 /* Protocol-mismatch, empty out vlan_tci for new tag */ 542 skb_push(skb, ETH_HLEN); 543 skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto, 544 skb_vlan_tag_get(skb)); 545 if (unlikely(!skb)) 546 return false; 547 548 skb_pull(skb, ETH_HLEN); 549 skb_reset_mac_len(skb); 550 *vid = 0; 551 tagged = false; 552 } else { 553 tagged = true; 554 } 555 } else { 556 /* Untagged frame */ 557 tagged = false; 558 } 559 560 if (!*vid) { 561 u16 pvid = br_get_pvid(vg); 562 563 /* Frame had a tag with VID 0 or did not have a tag. 564 * See if pvid is set on this port. That tells us which 565 * vlan untagged or priority-tagged traffic belongs to. 566 */ 567 if (!pvid) 568 goto drop; 569 570 /* PVID is set on this port. Any untagged or priority-tagged 571 * ingress frame is considered to belong to this vlan. 572 */ 573 *vid = pvid; 574 if (likely(!tagged)) 575 /* Untagged Frame. */ 576 __vlan_hwaccel_put_tag(skb, br->vlan_proto, pvid); 577 else 578 /* Priority-tagged Frame. 579 * At this point, we know that skb->vlan_tci VID 580 * field was 0. 581 * We update only VID field and preserve PCP field. 582 */ 583 skb->vlan_tci |= pvid; 584 585 /* if snooping and stats are disabled we can avoid the lookup */ 586 if (!br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED) && 587 !br_opt_get(br, BROPT_VLAN_STATS_ENABLED)) { 588 if (*state == BR_STATE_FORWARDING) { 589 *state = br_vlan_get_pvid_state(vg); 590 if (!br_vlan_state_allowed(*state, true)) 591 goto drop; 592 } 593 return true; 594 } 595 } 596 v = br_vlan_find(vg, *vid); 597 if (!v || !br_vlan_should_use(v)) 598 goto drop; 599 600 if (*state == BR_STATE_FORWARDING) { 601 *state = br_vlan_get_state(v); 602 if (!br_vlan_state_allowed(*state, true)) 603 goto drop; 604 } 605 606 if (br_opt_get(br, BROPT_VLAN_STATS_ENABLED)) { 607 stats = this_cpu_ptr(v->stats); 608 u64_stats_update_begin(&stats->syncp); 609 stats->rx_bytes += skb->len; 610 stats->rx_packets++; 611 u64_stats_update_end(&stats->syncp); 612 } 613 614 *vlan = v; 615 616 return true; 617 618 drop: 619 kfree_skb(skb); 620 return false; 621 } 622 623 bool br_allowed_ingress(const struct net_bridge *br, 624 struct net_bridge_vlan_group *vg, struct sk_buff *skb, 625 u16 *vid, u8 *state, 626 struct net_bridge_vlan **vlan) 627 { 628 /* If VLAN filtering is disabled on the bridge, all packets are 629 * permitted. 630 */ 631 *vlan = NULL; 632 if (!br_opt_get(br, BROPT_VLAN_ENABLED)) { 633 BR_INPUT_SKB_CB(skb)->vlan_filtered = false; 634 return true; 635 } 636 637 return __allowed_ingress(br, vg, skb, vid, state, vlan); 638 } 639 640 /* Called under RCU. */ 641 bool br_allowed_egress(struct net_bridge_vlan_group *vg, 642 const struct sk_buff *skb) 643 { 644 const struct net_bridge_vlan *v; 645 u16 vid; 646 647 /* If this packet was not filtered at input, let it pass */ 648 if (!BR_INPUT_SKB_CB(skb)->vlan_filtered) 649 return true; 650 651 br_vlan_get_tag(skb, &vid); 652 v = br_vlan_find(vg, vid); 653 if (v && br_vlan_should_use(v) && 654 br_vlan_state_allowed(br_vlan_get_state(v), false)) 655 return true; 656 657 return false; 658 } 659 660 /* Called under RCU */ 661 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid) 662 { 663 struct net_bridge_vlan_group *vg; 664 struct net_bridge *br = p->br; 665 struct net_bridge_vlan *v; 666 667 /* If filtering was disabled at input, let it pass. */ 668 if (!br_opt_get(br, BROPT_VLAN_ENABLED)) 669 return true; 670 671 vg = nbp_vlan_group_rcu(p); 672 if (!vg || !vg->num_vlans) 673 return false; 674 675 if (!br_vlan_get_tag(skb, vid) && skb->vlan_proto != br->vlan_proto) 676 *vid = 0; 677 678 if (!*vid) { 679 *vid = br_get_pvid(vg); 680 if (!*vid || 681 !br_vlan_state_allowed(br_vlan_get_pvid_state(vg), true)) 682 return false; 683 684 return true; 685 } 686 687 v = br_vlan_find(vg, *vid); 688 if (v && br_vlan_state_allowed(br_vlan_get_state(v), true)) 689 return true; 690 691 return false; 692 } 693 694 static int br_vlan_add_existing(struct net_bridge *br, 695 struct net_bridge_vlan_group *vg, 696 struct net_bridge_vlan *vlan, 697 u16 flags, bool *changed, 698 struct netlink_ext_ack *extack) 699 { 700 bool would_change = __vlan_flags_would_change(vlan, flags); 701 bool becomes_brentry = false; 702 int err; 703 704 if (!br_vlan_is_brentry(vlan)) { 705 /* Trying to change flags of non-existent bridge vlan */ 706 if (!(flags & BRIDGE_VLAN_INFO_BRENTRY)) 707 return -EINVAL; 708 709 becomes_brentry = true; 710 } 711 712 /* Master VLANs that aren't brentries weren't notified before, 713 * time to notify them now. 714 */ 715 if (becomes_brentry || would_change) { 716 err = br_switchdev_port_vlan_add(br->dev, vlan->vid, flags, 717 would_change, extack); 718 if (err && err != -EOPNOTSUPP) 719 return err; 720 } 721 722 if (becomes_brentry) { 723 /* It was only kept for port vlans, now make it real */ 724 err = br_fdb_add_local(br, NULL, br->dev->dev_addr, vlan->vid); 725 if (err) { 726 br_err(br, "failed to insert local address into bridge forwarding table\n"); 727 goto err_fdb_insert; 728 } 729 730 refcount_inc(&vlan->refcnt); 731 vlan->flags |= BRIDGE_VLAN_INFO_BRENTRY; 732 vg->num_vlans++; 733 *changed = true; 734 br_multicast_toggle_one_vlan(vlan, true); 735 } 736 737 __vlan_flags_commit(vlan, flags); 738 if (would_change) 739 *changed = true; 740 741 return 0; 742 743 err_fdb_insert: 744 br_switchdev_port_vlan_del(br->dev, vlan->vid); 745 return err; 746 } 747 748 /* Must be protected by RTNL. 749 * Must be called with vid in range from 1 to 4094 inclusive. 750 * changed must be true only if the vlan was created or updated 751 */ 752 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, bool *changed, 753 struct netlink_ext_ack *extack) 754 { 755 struct net_bridge_vlan_group *vg; 756 struct net_bridge_vlan *vlan; 757 int ret; 758 759 ASSERT_RTNL(); 760 761 *changed = false; 762 vg = br_vlan_group(br); 763 vlan = br_vlan_find(vg, vid); 764 if (vlan) 765 return br_vlan_add_existing(br, vg, vlan, flags, changed, 766 extack); 767 768 vlan = kzalloc(sizeof(*vlan), GFP_KERNEL); 769 if (!vlan) 770 return -ENOMEM; 771 772 vlan->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 773 if (!vlan->stats) { 774 kfree(vlan); 775 return -ENOMEM; 776 } 777 vlan->vid = vid; 778 vlan->flags = flags | BRIDGE_VLAN_INFO_MASTER; 779 vlan->flags &= ~BRIDGE_VLAN_INFO_PVID; 780 vlan->br = br; 781 if (flags & BRIDGE_VLAN_INFO_BRENTRY) 782 refcount_set(&vlan->refcnt, 1); 783 ret = __vlan_add(vlan, flags, extack); 784 if (ret) { 785 free_percpu(vlan->stats); 786 kfree(vlan); 787 } else { 788 *changed = true; 789 } 790 791 return ret; 792 } 793 794 /* Must be protected by RTNL. 795 * Must be called with vid in range from 1 to 4094 inclusive. 796 */ 797 int br_vlan_delete(struct net_bridge *br, u16 vid) 798 { 799 struct net_bridge_vlan_group *vg; 800 struct net_bridge_vlan *v; 801 802 ASSERT_RTNL(); 803 804 vg = br_vlan_group(br); 805 v = br_vlan_find(vg, vid); 806 if (!v || !br_vlan_is_brentry(v)) 807 return -ENOENT; 808 809 br_fdb_find_delete_local(br, NULL, br->dev->dev_addr, vid); 810 br_fdb_delete_by_port(br, NULL, vid, 0); 811 812 vlan_tunnel_info_del(vg, v); 813 814 return __vlan_del(v); 815 } 816 817 void br_vlan_flush(struct net_bridge *br) 818 { 819 struct net_bridge_vlan_group *vg; 820 821 ASSERT_RTNL(); 822 823 vg = br_vlan_group(br); 824 __vlan_flush(br, NULL, vg); 825 RCU_INIT_POINTER(br->vlgrp, NULL); 826 synchronize_rcu(); 827 __vlan_group_free(vg); 828 } 829 830 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid) 831 { 832 if (!vg) 833 return NULL; 834 835 return br_vlan_lookup(&vg->vlan_hash, vid); 836 } 837 838 /* Must be protected by RTNL. */ 839 static void recalculate_group_addr(struct net_bridge *br) 840 { 841 if (br_opt_get(br, BROPT_GROUP_ADDR_SET)) 842 return; 843 844 spin_lock_bh(&br->lock); 845 if (!br_opt_get(br, BROPT_VLAN_ENABLED) || 846 br->vlan_proto == htons(ETH_P_8021Q)) { 847 /* Bridge Group Address */ 848 br->group_addr[5] = 0x00; 849 } else { /* vlan_enabled && ETH_P_8021AD */ 850 /* Provider Bridge Group Address */ 851 br->group_addr[5] = 0x08; 852 } 853 spin_unlock_bh(&br->lock); 854 } 855 856 /* Must be protected by RTNL. */ 857 void br_recalculate_fwd_mask(struct net_bridge *br) 858 { 859 if (!br_opt_get(br, BROPT_VLAN_ENABLED) || 860 br->vlan_proto == htons(ETH_P_8021Q)) 861 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT; 862 else /* vlan_enabled && ETH_P_8021AD */ 863 br->group_fwd_mask_required = BR_GROUPFWD_8021AD & 864 ~(1u << br->group_addr[5]); 865 } 866 867 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val, 868 struct netlink_ext_ack *extack) 869 { 870 struct switchdev_attr attr = { 871 .orig_dev = br->dev, 872 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING, 873 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP, 874 .u.vlan_filtering = val, 875 }; 876 int err; 877 878 if (br_opt_get(br, BROPT_VLAN_ENABLED) == !!val) 879 return 0; 880 881 br_opt_toggle(br, BROPT_VLAN_ENABLED, !!val); 882 883 err = switchdev_port_attr_set(br->dev, &attr, extack); 884 if (err && err != -EOPNOTSUPP) { 885 br_opt_toggle(br, BROPT_VLAN_ENABLED, !val); 886 return err; 887 } 888 889 br_manage_promisc(br); 890 recalculate_group_addr(br); 891 br_recalculate_fwd_mask(br); 892 if (!val && br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) { 893 br_info(br, "vlan filtering disabled, automatically disabling multicast vlan snooping\n"); 894 br_multicast_toggle_vlan_snooping(br, false, NULL); 895 } 896 897 return 0; 898 } 899 900 bool br_vlan_enabled(const struct net_device *dev) 901 { 902 struct net_bridge *br = netdev_priv(dev); 903 904 return br_opt_get(br, BROPT_VLAN_ENABLED); 905 } 906 EXPORT_SYMBOL_GPL(br_vlan_enabled); 907 908 int br_vlan_get_proto(const struct net_device *dev, u16 *p_proto) 909 { 910 struct net_bridge *br = netdev_priv(dev); 911 912 *p_proto = ntohs(br->vlan_proto); 913 914 return 0; 915 } 916 EXPORT_SYMBOL_GPL(br_vlan_get_proto); 917 918 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto, 919 struct netlink_ext_ack *extack) 920 { 921 struct switchdev_attr attr = { 922 .orig_dev = br->dev, 923 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_PROTOCOL, 924 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP, 925 .u.vlan_protocol = ntohs(proto), 926 }; 927 int err = 0; 928 struct net_bridge_port *p; 929 struct net_bridge_vlan *vlan; 930 struct net_bridge_vlan_group *vg; 931 __be16 oldproto = br->vlan_proto; 932 933 if (br->vlan_proto == proto) 934 return 0; 935 936 err = switchdev_port_attr_set(br->dev, &attr, extack); 937 if (err && err != -EOPNOTSUPP) 938 return err; 939 940 /* Add VLANs for the new proto to the device filter. */ 941 list_for_each_entry(p, &br->port_list, list) { 942 vg = nbp_vlan_group(p); 943 list_for_each_entry(vlan, &vg->vlan_list, vlist) { 944 err = vlan_vid_add(p->dev, proto, vlan->vid); 945 if (err) 946 goto err_filt; 947 } 948 } 949 950 br->vlan_proto = proto; 951 952 recalculate_group_addr(br); 953 br_recalculate_fwd_mask(br); 954 955 /* Delete VLANs for the old proto from the device filter. */ 956 list_for_each_entry(p, &br->port_list, list) { 957 vg = nbp_vlan_group(p); 958 list_for_each_entry(vlan, &vg->vlan_list, vlist) 959 vlan_vid_del(p->dev, oldproto, vlan->vid); 960 } 961 962 return 0; 963 964 err_filt: 965 attr.u.vlan_protocol = ntohs(oldproto); 966 switchdev_port_attr_set(br->dev, &attr, NULL); 967 968 list_for_each_entry_continue_reverse(vlan, &vg->vlan_list, vlist) 969 vlan_vid_del(p->dev, proto, vlan->vid); 970 971 list_for_each_entry_continue_reverse(p, &br->port_list, list) { 972 vg = nbp_vlan_group(p); 973 list_for_each_entry(vlan, &vg->vlan_list, vlist) 974 vlan_vid_del(p->dev, proto, vlan->vid); 975 } 976 977 return err; 978 } 979 980 int br_vlan_set_proto(struct net_bridge *br, unsigned long val, 981 struct netlink_ext_ack *extack) 982 { 983 if (!eth_type_vlan(htons(val))) 984 return -EPROTONOSUPPORT; 985 986 return __br_vlan_set_proto(br, htons(val), extack); 987 } 988 989 int br_vlan_set_stats(struct net_bridge *br, unsigned long val) 990 { 991 switch (val) { 992 case 0: 993 case 1: 994 br_opt_toggle(br, BROPT_VLAN_STATS_ENABLED, !!val); 995 break; 996 default: 997 return -EINVAL; 998 } 999 1000 return 0; 1001 } 1002 1003 int br_vlan_set_stats_per_port(struct net_bridge *br, unsigned long val) 1004 { 1005 struct net_bridge_port *p; 1006 1007 /* allow to change the option if there are no port vlans configured */ 1008 list_for_each_entry(p, &br->port_list, list) { 1009 struct net_bridge_vlan_group *vg = nbp_vlan_group(p); 1010 1011 if (vg->num_vlans) 1012 return -EBUSY; 1013 } 1014 1015 switch (val) { 1016 case 0: 1017 case 1: 1018 br_opt_toggle(br, BROPT_VLAN_STATS_PER_PORT, !!val); 1019 break; 1020 default: 1021 return -EINVAL; 1022 } 1023 1024 return 0; 1025 } 1026 1027 static bool vlan_default_pvid(struct net_bridge_vlan_group *vg, u16 vid) 1028 { 1029 struct net_bridge_vlan *v; 1030 1031 if (vid != vg->pvid) 1032 return false; 1033 1034 v = br_vlan_lookup(&vg->vlan_hash, vid); 1035 if (v && br_vlan_should_use(v) && 1036 (v->flags & BRIDGE_VLAN_INFO_UNTAGGED)) 1037 return true; 1038 1039 return false; 1040 } 1041 1042 static void br_vlan_disable_default_pvid(struct net_bridge *br) 1043 { 1044 struct net_bridge_port *p; 1045 u16 pvid = br->default_pvid; 1046 1047 /* Disable default_pvid on all ports where it is still 1048 * configured. 1049 */ 1050 if (vlan_default_pvid(br_vlan_group(br), pvid)) { 1051 if (!br_vlan_delete(br, pvid)) 1052 br_vlan_notify(br, NULL, pvid, 0, RTM_DELVLAN); 1053 } 1054 1055 list_for_each_entry(p, &br->port_list, list) { 1056 if (vlan_default_pvid(nbp_vlan_group(p), pvid) && 1057 !nbp_vlan_delete(p, pvid)) 1058 br_vlan_notify(br, p, pvid, 0, RTM_DELVLAN); 1059 } 1060 1061 br->default_pvid = 0; 1062 } 1063 1064 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid, 1065 struct netlink_ext_ack *extack) 1066 { 1067 const struct net_bridge_vlan *pvent; 1068 struct net_bridge_vlan_group *vg; 1069 struct net_bridge_port *p; 1070 unsigned long *changed; 1071 bool vlchange; 1072 u16 old_pvid; 1073 int err = 0; 1074 1075 if (!pvid) { 1076 br_vlan_disable_default_pvid(br); 1077 return 0; 1078 } 1079 1080 changed = bitmap_zalloc(BR_MAX_PORTS, GFP_KERNEL); 1081 if (!changed) 1082 return -ENOMEM; 1083 1084 old_pvid = br->default_pvid; 1085 1086 /* Update default_pvid config only if we do not conflict with 1087 * user configuration. 1088 */ 1089 vg = br_vlan_group(br); 1090 pvent = br_vlan_find(vg, pvid); 1091 if ((!old_pvid || vlan_default_pvid(vg, old_pvid)) && 1092 (!pvent || !br_vlan_should_use(pvent))) { 1093 err = br_vlan_add(br, pvid, 1094 BRIDGE_VLAN_INFO_PVID | 1095 BRIDGE_VLAN_INFO_UNTAGGED | 1096 BRIDGE_VLAN_INFO_BRENTRY, 1097 &vlchange, extack); 1098 if (err) 1099 goto out; 1100 1101 if (br_vlan_delete(br, old_pvid)) 1102 br_vlan_notify(br, NULL, old_pvid, 0, RTM_DELVLAN); 1103 br_vlan_notify(br, NULL, pvid, 0, RTM_NEWVLAN); 1104 __set_bit(0, changed); 1105 } 1106 1107 list_for_each_entry(p, &br->port_list, list) { 1108 /* Update default_pvid config only if we do not conflict with 1109 * user configuration. 1110 */ 1111 vg = nbp_vlan_group(p); 1112 if ((old_pvid && 1113 !vlan_default_pvid(vg, old_pvid)) || 1114 br_vlan_find(vg, pvid)) 1115 continue; 1116 1117 err = nbp_vlan_add(p, pvid, 1118 BRIDGE_VLAN_INFO_PVID | 1119 BRIDGE_VLAN_INFO_UNTAGGED, 1120 &vlchange, extack); 1121 if (err) 1122 goto err_port; 1123 if (nbp_vlan_delete(p, old_pvid)) 1124 br_vlan_notify(br, p, old_pvid, 0, RTM_DELVLAN); 1125 br_vlan_notify(p->br, p, pvid, 0, RTM_NEWVLAN); 1126 __set_bit(p->port_no, changed); 1127 } 1128 1129 br->default_pvid = pvid; 1130 1131 out: 1132 bitmap_free(changed); 1133 return err; 1134 1135 err_port: 1136 list_for_each_entry_continue_reverse(p, &br->port_list, list) { 1137 if (!test_bit(p->port_no, changed)) 1138 continue; 1139 1140 if (old_pvid) { 1141 nbp_vlan_add(p, old_pvid, 1142 BRIDGE_VLAN_INFO_PVID | 1143 BRIDGE_VLAN_INFO_UNTAGGED, 1144 &vlchange, NULL); 1145 br_vlan_notify(p->br, p, old_pvid, 0, RTM_NEWVLAN); 1146 } 1147 nbp_vlan_delete(p, pvid); 1148 br_vlan_notify(br, p, pvid, 0, RTM_DELVLAN); 1149 } 1150 1151 if (test_bit(0, changed)) { 1152 if (old_pvid) { 1153 br_vlan_add(br, old_pvid, 1154 BRIDGE_VLAN_INFO_PVID | 1155 BRIDGE_VLAN_INFO_UNTAGGED | 1156 BRIDGE_VLAN_INFO_BRENTRY, 1157 &vlchange, NULL); 1158 br_vlan_notify(br, NULL, old_pvid, 0, RTM_NEWVLAN); 1159 } 1160 br_vlan_delete(br, pvid); 1161 br_vlan_notify(br, NULL, pvid, 0, RTM_DELVLAN); 1162 } 1163 goto out; 1164 } 1165 1166 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val, 1167 struct netlink_ext_ack *extack) 1168 { 1169 u16 pvid = val; 1170 int err = 0; 1171 1172 if (val >= VLAN_VID_MASK) 1173 return -EINVAL; 1174 1175 if (pvid == br->default_pvid) 1176 goto out; 1177 1178 /* Only allow default pvid change when filtering is disabled */ 1179 if (br_opt_get(br, BROPT_VLAN_ENABLED)) { 1180 pr_info_once("Please disable vlan filtering to change default_pvid\n"); 1181 err = -EPERM; 1182 goto out; 1183 } 1184 err = __br_vlan_set_default_pvid(br, pvid, extack); 1185 out: 1186 return err; 1187 } 1188 1189 int br_vlan_init(struct net_bridge *br) 1190 { 1191 struct net_bridge_vlan_group *vg; 1192 int ret = -ENOMEM; 1193 1194 vg = kzalloc(sizeof(*vg), GFP_KERNEL); 1195 if (!vg) 1196 goto out; 1197 ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params); 1198 if (ret) 1199 goto err_rhtbl; 1200 ret = vlan_tunnel_init(vg); 1201 if (ret) 1202 goto err_tunnel_init; 1203 INIT_LIST_HEAD(&vg->vlan_list); 1204 br->vlan_proto = htons(ETH_P_8021Q); 1205 br->default_pvid = 1; 1206 rcu_assign_pointer(br->vlgrp, vg); 1207 1208 out: 1209 return ret; 1210 1211 err_tunnel_init: 1212 rhashtable_destroy(&vg->vlan_hash); 1213 err_rhtbl: 1214 kfree(vg); 1215 1216 goto out; 1217 } 1218 1219 int nbp_vlan_init(struct net_bridge_port *p, struct netlink_ext_ack *extack) 1220 { 1221 struct switchdev_attr attr = { 1222 .orig_dev = p->br->dev, 1223 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING, 1224 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP, 1225 .u.vlan_filtering = br_opt_get(p->br, BROPT_VLAN_ENABLED), 1226 }; 1227 struct net_bridge_vlan_group *vg; 1228 int ret = -ENOMEM; 1229 1230 vg = kzalloc(sizeof(struct net_bridge_vlan_group), GFP_KERNEL); 1231 if (!vg) 1232 goto out; 1233 1234 ret = switchdev_port_attr_set(p->dev, &attr, extack); 1235 if (ret && ret != -EOPNOTSUPP) 1236 goto err_vlan_enabled; 1237 1238 ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params); 1239 if (ret) 1240 goto err_rhtbl; 1241 ret = vlan_tunnel_init(vg); 1242 if (ret) 1243 goto err_tunnel_init; 1244 INIT_LIST_HEAD(&vg->vlan_list); 1245 rcu_assign_pointer(p->vlgrp, vg); 1246 if (p->br->default_pvid) { 1247 bool changed; 1248 1249 ret = nbp_vlan_add(p, p->br->default_pvid, 1250 BRIDGE_VLAN_INFO_PVID | 1251 BRIDGE_VLAN_INFO_UNTAGGED, 1252 &changed, extack); 1253 if (ret) 1254 goto err_vlan_add; 1255 br_vlan_notify(p->br, p, p->br->default_pvid, 0, RTM_NEWVLAN); 1256 } 1257 out: 1258 return ret; 1259 1260 err_vlan_add: 1261 RCU_INIT_POINTER(p->vlgrp, NULL); 1262 synchronize_rcu(); 1263 vlan_tunnel_deinit(vg); 1264 err_tunnel_init: 1265 rhashtable_destroy(&vg->vlan_hash); 1266 err_rhtbl: 1267 err_vlan_enabled: 1268 kfree(vg); 1269 1270 goto out; 1271 } 1272 1273 /* Must be protected by RTNL. 1274 * Must be called with vid in range from 1 to 4094 inclusive. 1275 * changed must be true only if the vlan was created or updated 1276 */ 1277 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags, 1278 bool *changed, struct netlink_ext_ack *extack) 1279 { 1280 struct net_bridge_vlan *vlan; 1281 int ret; 1282 1283 ASSERT_RTNL(); 1284 1285 *changed = false; 1286 vlan = br_vlan_find(nbp_vlan_group(port), vid); 1287 if (vlan) { 1288 bool would_change = __vlan_flags_would_change(vlan, flags); 1289 1290 if (would_change) { 1291 /* Pass the flags to the hardware bridge */ 1292 ret = br_switchdev_port_vlan_add(port->dev, vid, flags, 1293 true, extack); 1294 if (ret && ret != -EOPNOTSUPP) 1295 return ret; 1296 } 1297 1298 __vlan_flags_commit(vlan, flags); 1299 *changed = would_change; 1300 1301 return 0; 1302 } 1303 1304 vlan = kzalloc(sizeof(*vlan), GFP_KERNEL); 1305 if (!vlan) 1306 return -ENOMEM; 1307 1308 vlan->vid = vid; 1309 vlan->port = port; 1310 ret = __vlan_add(vlan, flags, extack); 1311 if (ret) 1312 kfree(vlan); 1313 else 1314 *changed = true; 1315 1316 return ret; 1317 } 1318 1319 /* Must be protected by RTNL. 1320 * Must be called with vid in range from 1 to 4094 inclusive. 1321 */ 1322 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid) 1323 { 1324 struct net_bridge_vlan *v; 1325 1326 ASSERT_RTNL(); 1327 1328 v = br_vlan_find(nbp_vlan_group(port), vid); 1329 if (!v) 1330 return -ENOENT; 1331 br_fdb_find_delete_local(port->br, port, port->dev->dev_addr, vid); 1332 br_fdb_delete_by_port(port->br, port, vid, 0); 1333 1334 return __vlan_del(v); 1335 } 1336 1337 void nbp_vlan_flush(struct net_bridge_port *port) 1338 { 1339 struct net_bridge_vlan_group *vg; 1340 1341 ASSERT_RTNL(); 1342 1343 vg = nbp_vlan_group(port); 1344 __vlan_flush(port->br, port, vg); 1345 RCU_INIT_POINTER(port->vlgrp, NULL); 1346 synchronize_rcu(); 1347 __vlan_group_free(vg); 1348 } 1349 1350 void br_vlan_get_stats(const struct net_bridge_vlan *v, 1351 struct pcpu_sw_netstats *stats) 1352 { 1353 int i; 1354 1355 memset(stats, 0, sizeof(*stats)); 1356 for_each_possible_cpu(i) { 1357 u64 rxpackets, rxbytes, txpackets, txbytes; 1358 struct pcpu_sw_netstats *cpu_stats; 1359 unsigned int start; 1360 1361 cpu_stats = per_cpu_ptr(v->stats, i); 1362 do { 1363 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp); 1364 rxpackets = cpu_stats->rx_packets; 1365 rxbytes = cpu_stats->rx_bytes; 1366 txbytes = cpu_stats->tx_bytes; 1367 txpackets = cpu_stats->tx_packets; 1368 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start)); 1369 1370 stats->rx_packets += rxpackets; 1371 stats->rx_bytes += rxbytes; 1372 stats->tx_bytes += txbytes; 1373 stats->tx_packets += txpackets; 1374 } 1375 } 1376 1377 int br_vlan_get_pvid(const struct net_device *dev, u16 *p_pvid) 1378 { 1379 struct net_bridge_vlan_group *vg; 1380 struct net_bridge_port *p; 1381 1382 ASSERT_RTNL(); 1383 p = br_port_get_check_rtnl(dev); 1384 if (p) 1385 vg = nbp_vlan_group(p); 1386 else if (netif_is_bridge_master(dev)) 1387 vg = br_vlan_group(netdev_priv(dev)); 1388 else 1389 return -EINVAL; 1390 1391 *p_pvid = br_get_pvid(vg); 1392 return 0; 1393 } 1394 EXPORT_SYMBOL_GPL(br_vlan_get_pvid); 1395 1396 int br_vlan_get_pvid_rcu(const struct net_device *dev, u16 *p_pvid) 1397 { 1398 struct net_bridge_vlan_group *vg; 1399 struct net_bridge_port *p; 1400 1401 p = br_port_get_check_rcu(dev); 1402 if (p) 1403 vg = nbp_vlan_group_rcu(p); 1404 else if (netif_is_bridge_master(dev)) 1405 vg = br_vlan_group_rcu(netdev_priv(dev)); 1406 else 1407 return -EINVAL; 1408 1409 *p_pvid = br_get_pvid(vg); 1410 return 0; 1411 } 1412 EXPORT_SYMBOL_GPL(br_vlan_get_pvid_rcu); 1413 1414 void br_vlan_fill_forward_path_pvid(struct net_bridge *br, 1415 struct net_device_path_ctx *ctx, 1416 struct net_device_path *path) 1417 { 1418 struct net_bridge_vlan_group *vg; 1419 int idx = ctx->num_vlans - 1; 1420 u16 vid; 1421 1422 path->bridge.vlan_mode = DEV_PATH_BR_VLAN_KEEP; 1423 1424 if (!br_opt_get(br, BROPT_VLAN_ENABLED)) 1425 return; 1426 1427 vg = br_vlan_group(br); 1428 1429 if (idx >= 0 && 1430 ctx->vlan[idx].proto == br->vlan_proto) { 1431 vid = ctx->vlan[idx].id; 1432 } else { 1433 path->bridge.vlan_mode = DEV_PATH_BR_VLAN_TAG; 1434 vid = br_get_pvid(vg); 1435 } 1436 1437 path->bridge.vlan_id = vid; 1438 path->bridge.vlan_proto = br->vlan_proto; 1439 } 1440 1441 int br_vlan_fill_forward_path_mode(struct net_bridge *br, 1442 struct net_bridge_port *dst, 1443 struct net_device_path *path) 1444 { 1445 struct net_bridge_vlan_group *vg; 1446 struct net_bridge_vlan *v; 1447 1448 if (!br_opt_get(br, BROPT_VLAN_ENABLED)) 1449 return 0; 1450 1451 vg = nbp_vlan_group_rcu(dst); 1452 v = br_vlan_find(vg, path->bridge.vlan_id); 1453 if (!v || !br_vlan_should_use(v)) 1454 return -EINVAL; 1455 1456 if (!(v->flags & BRIDGE_VLAN_INFO_UNTAGGED)) 1457 return 0; 1458 1459 if (path->bridge.vlan_mode == DEV_PATH_BR_VLAN_TAG) 1460 path->bridge.vlan_mode = DEV_PATH_BR_VLAN_KEEP; 1461 else if (v->priv_flags & BR_VLFLAG_ADDED_BY_SWITCHDEV) 1462 path->bridge.vlan_mode = DEV_PATH_BR_VLAN_UNTAG_HW; 1463 else 1464 path->bridge.vlan_mode = DEV_PATH_BR_VLAN_UNTAG; 1465 1466 return 0; 1467 } 1468 1469 int br_vlan_get_info(const struct net_device *dev, u16 vid, 1470 struct bridge_vlan_info *p_vinfo) 1471 { 1472 struct net_bridge_vlan_group *vg; 1473 struct net_bridge_vlan *v; 1474 struct net_bridge_port *p; 1475 1476 ASSERT_RTNL(); 1477 p = br_port_get_check_rtnl(dev); 1478 if (p) 1479 vg = nbp_vlan_group(p); 1480 else if (netif_is_bridge_master(dev)) 1481 vg = br_vlan_group(netdev_priv(dev)); 1482 else 1483 return -EINVAL; 1484 1485 v = br_vlan_find(vg, vid); 1486 if (!v) 1487 return -ENOENT; 1488 1489 p_vinfo->vid = vid; 1490 p_vinfo->flags = v->flags; 1491 if (vid == br_get_pvid(vg)) 1492 p_vinfo->flags |= BRIDGE_VLAN_INFO_PVID; 1493 return 0; 1494 } 1495 EXPORT_SYMBOL_GPL(br_vlan_get_info); 1496 1497 int br_vlan_get_info_rcu(const struct net_device *dev, u16 vid, 1498 struct bridge_vlan_info *p_vinfo) 1499 { 1500 struct net_bridge_vlan_group *vg; 1501 struct net_bridge_vlan *v; 1502 struct net_bridge_port *p; 1503 1504 p = br_port_get_check_rcu(dev); 1505 if (p) 1506 vg = nbp_vlan_group_rcu(p); 1507 else if (netif_is_bridge_master(dev)) 1508 vg = br_vlan_group_rcu(netdev_priv(dev)); 1509 else 1510 return -EINVAL; 1511 1512 v = br_vlan_find(vg, vid); 1513 if (!v) 1514 return -ENOENT; 1515 1516 p_vinfo->vid = vid; 1517 p_vinfo->flags = v->flags; 1518 if (vid == br_get_pvid(vg)) 1519 p_vinfo->flags |= BRIDGE_VLAN_INFO_PVID; 1520 return 0; 1521 } 1522 EXPORT_SYMBOL_GPL(br_vlan_get_info_rcu); 1523 1524 static int br_vlan_is_bind_vlan_dev(const struct net_device *dev) 1525 { 1526 return is_vlan_dev(dev) && 1527 !!(vlan_dev_priv(dev)->flags & VLAN_FLAG_BRIDGE_BINDING); 1528 } 1529 1530 static int br_vlan_is_bind_vlan_dev_fn(struct net_device *dev, 1531 __always_unused struct netdev_nested_priv *priv) 1532 { 1533 return br_vlan_is_bind_vlan_dev(dev); 1534 } 1535 1536 static bool br_vlan_has_upper_bind_vlan_dev(struct net_device *dev) 1537 { 1538 int found; 1539 1540 rcu_read_lock(); 1541 found = netdev_walk_all_upper_dev_rcu(dev, br_vlan_is_bind_vlan_dev_fn, 1542 NULL); 1543 rcu_read_unlock(); 1544 1545 return !!found; 1546 } 1547 1548 struct br_vlan_bind_walk_data { 1549 u16 vid; 1550 struct net_device *result; 1551 }; 1552 1553 static int br_vlan_match_bind_vlan_dev_fn(struct net_device *dev, 1554 struct netdev_nested_priv *priv) 1555 { 1556 struct br_vlan_bind_walk_data *data = priv->data; 1557 int found = 0; 1558 1559 if (br_vlan_is_bind_vlan_dev(dev) && 1560 vlan_dev_priv(dev)->vlan_id == data->vid) { 1561 data->result = dev; 1562 found = 1; 1563 } 1564 1565 return found; 1566 } 1567 1568 static struct net_device * 1569 br_vlan_get_upper_bind_vlan_dev(struct net_device *dev, u16 vid) 1570 { 1571 struct br_vlan_bind_walk_data data = { 1572 .vid = vid, 1573 }; 1574 struct netdev_nested_priv priv = { 1575 .data = (void *)&data, 1576 }; 1577 1578 rcu_read_lock(); 1579 netdev_walk_all_upper_dev_rcu(dev, br_vlan_match_bind_vlan_dev_fn, 1580 &priv); 1581 rcu_read_unlock(); 1582 1583 return data.result; 1584 } 1585 1586 static bool br_vlan_is_dev_up(const struct net_device *dev) 1587 { 1588 return !!(dev->flags & IFF_UP) && netif_oper_up(dev); 1589 } 1590 1591 static void br_vlan_set_vlan_dev_state(const struct net_bridge *br, 1592 struct net_device *vlan_dev) 1593 { 1594 u16 vid = vlan_dev_priv(vlan_dev)->vlan_id; 1595 struct net_bridge_vlan_group *vg; 1596 struct net_bridge_port *p; 1597 bool has_carrier = false; 1598 1599 if (!netif_carrier_ok(br->dev)) { 1600 netif_carrier_off(vlan_dev); 1601 return; 1602 } 1603 1604 list_for_each_entry(p, &br->port_list, list) { 1605 vg = nbp_vlan_group(p); 1606 if (br_vlan_find(vg, vid) && br_vlan_is_dev_up(p->dev)) { 1607 has_carrier = true; 1608 break; 1609 } 1610 } 1611 1612 if (has_carrier) 1613 netif_carrier_on(vlan_dev); 1614 else 1615 netif_carrier_off(vlan_dev); 1616 } 1617 1618 static void br_vlan_set_all_vlan_dev_state(struct net_bridge_port *p) 1619 { 1620 struct net_bridge_vlan_group *vg = nbp_vlan_group(p); 1621 struct net_bridge_vlan *vlan; 1622 struct net_device *vlan_dev; 1623 1624 list_for_each_entry(vlan, &vg->vlan_list, vlist) { 1625 vlan_dev = br_vlan_get_upper_bind_vlan_dev(p->br->dev, 1626 vlan->vid); 1627 if (vlan_dev) { 1628 if (br_vlan_is_dev_up(p->dev)) { 1629 if (netif_carrier_ok(p->br->dev)) 1630 netif_carrier_on(vlan_dev); 1631 } else { 1632 br_vlan_set_vlan_dev_state(p->br, vlan_dev); 1633 } 1634 } 1635 } 1636 } 1637 1638 static void br_vlan_upper_change(struct net_device *dev, 1639 struct net_device *upper_dev, 1640 bool linking) 1641 { 1642 struct net_bridge *br = netdev_priv(dev); 1643 1644 if (!br_vlan_is_bind_vlan_dev(upper_dev)) 1645 return; 1646 1647 if (linking) { 1648 br_vlan_set_vlan_dev_state(br, upper_dev); 1649 br_opt_toggle(br, BROPT_VLAN_BRIDGE_BINDING, true); 1650 } else { 1651 br_opt_toggle(br, BROPT_VLAN_BRIDGE_BINDING, 1652 br_vlan_has_upper_bind_vlan_dev(dev)); 1653 } 1654 } 1655 1656 struct br_vlan_link_state_walk_data { 1657 struct net_bridge *br; 1658 }; 1659 1660 static int br_vlan_link_state_change_fn(struct net_device *vlan_dev, 1661 struct netdev_nested_priv *priv) 1662 { 1663 struct br_vlan_link_state_walk_data *data = priv->data; 1664 1665 if (br_vlan_is_bind_vlan_dev(vlan_dev)) 1666 br_vlan_set_vlan_dev_state(data->br, vlan_dev); 1667 1668 return 0; 1669 } 1670 1671 static void br_vlan_link_state_change(struct net_device *dev, 1672 struct net_bridge *br) 1673 { 1674 struct br_vlan_link_state_walk_data data = { 1675 .br = br 1676 }; 1677 struct netdev_nested_priv priv = { 1678 .data = (void *)&data, 1679 }; 1680 1681 rcu_read_lock(); 1682 netdev_walk_all_upper_dev_rcu(dev, br_vlan_link_state_change_fn, 1683 &priv); 1684 rcu_read_unlock(); 1685 } 1686 1687 /* Must be protected by RTNL. */ 1688 static void nbp_vlan_set_vlan_dev_state(struct net_bridge_port *p, u16 vid) 1689 { 1690 struct net_device *vlan_dev; 1691 1692 if (!br_opt_get(p->br, BROPT_VLAN_BRIDGE_BINDING)) 1693 return; 1694 1695 vlan_dev = br_vlan_get_upper_bind_vlan_dev(p->br->dev, vid); 1696 if (vlan_dev) 1697 br_vlan_set_vlan_dev_state(p->br, vlan_dev); 1698 } 1699 1700 /* Must be protected by RTNL. */ 1701 int br_vlan_bridge_event(struct net_device *dev, unsigned long event, void *ptr) 1702 { 1703 struct netdev_notifier_changeupper_info *info; 1704 struct net_bridge *br = netdev_priv(dev); 1705 int vlcmd = 0, ret = 0; 1706 bool changed = false; 1707 1708 switch (event) { 1709 case NETDEV_REGISTER: 1710 ret = br_vlan_add(br, br->default_pvid, 1711 BRIDGE_VLAN_INFO_PVID | 1712 BRIDGE_VLAN_INFO_UNTAGGED | 1713 BRIDGE_VLAN_INFO_BRENTRY, &changed, NULL); 1714 vlcmd = RTM_NEWVLAN; 1715 break; 1716 case NETDEV_UNREGISTER: 1717 changed = !br_vlan_delete(br, br->default_pvid); 1718 vlcmd = RTM_DELVLAN; 1719 break; 1720 case NETDEV_CHANGEUPPER: 1721 info = ptr; 1722 br_vlan_upper_change(dev, info->upper_dev, info->linking); 1723 break; 1724 1725 case NETDEV_CHANGE: 1726 case NETDEV_UP: 1727 if (!br_opt_get(br, BROPT_VLAN_BRIDGE_BINDING)) 1728 break; 1729 br_vlan_link_state_change(dev, br); 1730 break; 1731 } 1732 if (changed) 1733 br_vlan_notify(br, NULL, br->default_pvid, 0, vlcmd); 1734 1735 return ret; 1736 } 1737 1738 /* Must be protected by RTNL. */ 1739 void br_vlan_port_event(struct net_bridge_port *p, unsigned long event) 1740 { 1741 if (!br_opt_get(p->br, BROPT_VLAN_BRIDGE_BINDING)) 1742 return; 1743 1744 switch (event) { 1745 case NETDEV_CHANGE: 1746 case NETDEV_DOWN: 1747 case NETDEV_UP: 1748 br_vlan_set_all_vlan_dev_state(p); 1749 break; 1750 } 1751 } 1752 1753 static bool br_vlan_stats_fill(struct sk_buff *skb, 1754 const struct net_bridge_vlan *v) 1755 { 1756 struct pcpu_sw_netstats stats; 1757 struct nlattr *nest; 1758 1759 nest = nla_nest_start(skb, BRIDGE_VLANDB_ENTRY_STATS); 1760 if (!nest) 1761 return false; 1762 1763 br_vlan_get_stats(v, &stats); 1764 if (nla_put_u64_64bit(skb, BRIDGE_VLANDB_STATS_RX_BYTES, stats.rx_bytes, 1765 BRIDGE_VLANDB_STATS_PAD) || 1766 nla_put_u64_64bit(skb, BRIDGE_VLANDB_STATS_RX_PACKETS, 1767 stats.rx_packets, BRIDGE_VLANDB_STATS_PAD) || 1768 nla_put_u64_64bit(skb, BRIDGE_VLANDB_STATS_TX_BYTES, stats.tx_bytes, 1769 BRIDGE_VLANDB_STATS_PAD) || 1770 nla_put_u64_64bit(skb, BRIDGE_VLANDB_STATS_TX_PACKETS, 1771 stats.tx_packets, BRIDGE_VLANDB_STATS_PAD)) 1772 goto out_err; 1773 1774 nla_nest_end(skb, nest); 1775 1776 return true; 1777 1778 out_err: 1779 nla_nest_cancel(skb, nest); 1780 return false; 1781 } 1782 1783 /* v_opts is used to dump the options which must be equal in the whole range */ 1784 static bool br_vlan_fill_vids(struct sk_buff *skb, u16 vid, u16 vid_range, 1785 const struct net_bridge_vlan *v_opts, 1786 u16 flags, 1787 bool dump_stats) 1788 { 1789 struct bridge_vlan_info info; 1790 struct nlattr *nest; 1791 1792 nest = nla_nest_start(skb, BRIDGE_VLANDB_ENTRY); 1793 if (!nest) 1794 return false; 1795 1796 memset(&info, 0, sizeof(info)); 1797 info.vid = vid; 1798 if (flags & BRIDGE_VLAN_INFO_UNTAGGED) 1799 info.flags |= BRIDGE_VLAN_INFO_UNTAGGED; 1800 if (flags & BRIDGE_VLAN_INFO_PVID) 1801 info.flags |= BRIDGE_VLAN_INFO_PVID; 1802 1803 if (nla_put(skb, BRIDGE_VLANDB_ENTRY_INFO, sizeof(info), &info)) 1804 goto out_err; 1805 1806 if (vid_range && vid < vid_range && 1807 !(flags & BRIDGE_VLAN_INFO_PVID) && 1808 nla_put_u16(skb, BRIDGE_VLANDB_ENTRY_RANGE, vid_range)) 1809 goto out_err; 1810 1811 if (v_opts) { 1812 if (!br_vlan_opts_fill(skb, v_opts)) 1813 goto out_err; 1814 1815 if (dump_stats && !br_vlan_stats_fill(skb, v_opts)) 1816 goto out_err; 1817 } 1818 1819 nla_nest_end(skb, nest); 1820 1821 return true; 1822 1823 out_err: 1824 nla_nest_cancel(skb, nest); 1825 return false; 1826 } 1827 1828 static size_t rtnl_vlan_nlmsg_size(void) 1829 { 1830 return NLMSG_ALIGN(sizeof(struct br_vlan_msg)) 1831 + nla_total_size(0) /* BRIDGE_VLANDB_ENTRY */ 1832 + nla_total_size(sizeof(u16)) /* BRIDGE_VLANDB_ENTRY_RANGE */ 1833 + nla_total_size(sizeof(struct bridge_vlan_info)) /* BRIDGE_VLANDB_ENTRY_INFO */ 1834 + br_vlan_opts_nl_size(); /* bridge vlan options */ 1835 } 1836 1837 void br_vlan_notify(const struct net_bridge *br, 1838 const struct net_bridge_port *p, 1839 u16 vid, u16 vid_range, 1840 int cmd) 1841 { 1842 struct net_bridge_vlan_group *vg; 1843 struct net_bridge_vlan *v = NULL; 1844 struct br_vlan_msg *bvm; 1845 struct nlmsghdr *nlh; 1846 struct sk_buff *skb; 1847 int err = -ENOBUFS; 1848 struct net *net; 1849 u16 flags = 0; 1850 int ifindex; 1851 1852 /* right now notifications are done only with rtnl held */ 1853 ASSERT_RTNL(); 1854 1855 if (p) { 1856 ifindex = p->dev->ifindex; 1857 vg = nbp_vlan_group(p); 1858 net = dev_net(p->dev); 1859 } else { 1860 ifindex = br->dev->ifindex; 1861 vg = br_vlan_group(br); 1862 net = dev_net(br->dev); 1863 } 1864 1865 skb = nlmsg_new(rtnl_vlan_nlmsg_size(), GFP_KERNEL); 1866 if (!skb) 1867 goto out_err; 1868 1869 err = -EMSGSIZE; 1870 nlh = nlmsg_put(skb, 0, 0, cmd, sizeof(*bvm), 0); 1871 if (!nlh) 1872 goto out_err; 1873 bvm = nlmsg_data(nlh); 1874 memset(bvm, 0, sizeof(*bvm)); 1875 bvm->family = AF_BRIDGE; 1876 bvm->ifindex = ifindex; 1877 1878 switch (cmd) { 1879 case RTM_NEWVLAN: 1880 /* need to find the vlan due to flags/options */ 1881 v = br_vlan_find(vg, vid); 1882 if (!v || !br_vlan_should_use(v)) 1883 goto out_kfree; 1884 1885 flags = v->flags; 1886 if (br_get_pvid(vg) == v->vid) 1887 flags |= BRIDGE_VLAN_INFO_PVID; 1888 break; 1889 case RTM_DELVLAN: 1890 break; 1891 default: 1892 goto out_kfree; 1893 } 1894 1895 if (!br_vlan_fill_vids(skb, vid, vid_range, v, flags, false)) 1896 goto out_err; 1897 1898 nlmsg_end(skb, nlh); 1899 rtnl_notify(skb, net, 0, RTNLGRP_BRVLAN, NULL, GFP_KERNEL); 1900 return; 1901 1902 out_err: 1903 rtnl_set_sk_err(net, RTNLGRP_BRVLAN, err); 1904 out_kfree: 1905 kfree_skb(skb); 1906 } 1907 1908 /* check if v_curr can enter a range ending in range_end */ 1909 bool br_vlan_can_enter_range(const struct net_bridge_vlan *v_curr, 1910 const struct net_bridge_vlan *range_end) 1911 { 1912 return v_curr->vid - range_end->vid == 1 && 1913 range_end->flags == v_curr->flags && 1914 br_vlan_opts_eq_range(v_curr, range_end); 1915 } 1916 1917 static int br_vlan_dump_dev(const struct net_device *dev, 1918 struct sk_buff *skb, 1919 struct netlink_callback *cb, 1920 u32 dump_flags) 1921 { 1922 struct net_bridge_vlan *v, *range_start = NULL, *range_end = NULL; 1923 bool dump_global = !!(dump_flags & BRIDGE_VLANDB_DUMPF_GLOBAL); 1924 bool dump_stats = !!(dump_flags & BRIDGE_VLANDB_DUMPF_STATS); 1925 struct net_bridge_vlan_group *vg; 1926 int idx = 0, s_idx = cb->args[1]; 1927 struct nlmsghdr *nlh = NULL; 1928 struct net_bridge_port *p; 1929 struct br_vlan_msg *bvm; 1930 struct net_bridge *br; 1931 int err = 0; 1932 u16 pvid; 1933 1934 if (!netif_is_bridge_master(dev) && !netif_is_bridge_port(dev)) 1935 return -EINVAL; 1936 1937 if (netif_is_bridge_master(dev)) { 1938 br = netdev_priv(dev); 1939 vg = br_vlan_group_rcu(br); 1940 p = NULL; 1941 } else { 1942 /* global options are dumped only for bridge devices */ 1943 if (dump_global) 1944 return 0; 1945 1946 p = br_port_get_rcu(dev); 1947 if (WARN_ON(!p)) 1948 return -EINVAL; 1949 vg = nbp_vlan_group_rcu(p); 1950 br = p->br; 1951 } 1952 1953 if (!vg) 1954 return 0; 1955 1956 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 1957 RTM_NEWVLAN, sizeof(*bvm), NLM_F_MULTI); 1958 if (!nlh) 1959 return -EMSGSIZE; 1960 bvm = nlmsg_data(nlh); 1961 memset(bvm, 0, sizeof(*bvm)); 1962 bvm->family = PF_BRIDGE; 1963 bvm->ifindex = dev->ifindex; 1964 pvid = br_get_pvid(vg); 1965 1966 /* idx must stay at range's beginning until it is filled in */ 1967 list_for_each_entry_rcu(v, &vg->vlan_list, vlist) { 1968 if (!dump_global && !br_vlan_should_use(v)) 1969 continue; 1970 if (idx < s_idx) { 1971 idx++; 1972 continue; 1973 } 1974 1975 if (!range_start) { 1976 range_start = v; 1977 range_end = v; 1978 continue; 1979 } 1980 1981 if (dump_global) { 1982 if (br_vlan_global_opts_can_enter_range(v, range_end)) 1983 goto update_end; 1984 if (!br_vlan_global_opts_fill(skb, range_start->vid, 1985 range_end->vid, 1986 range_start)) { 1987 err = -EMSGSIZE; 1988 break; 1989 } 1990 /* advance number of filled vlans */ 1991 idx += range_end->vid - range_start->vid + 1; 1992 1993 range_start = v; 1994 } else if (dump_stats || v->vid == pvid || 1995 !br_vlan_can_enter_range(v, range_end)) { 1996 u16 vlan_flags = br_vlan_flags(range_start, pvid); 1997 1998 if (!br_vlan_fill_vids(skb, range_start->vid, 1999 range_end->vid, range_start, 2000 vlan_flags, dump_stats)) { 2001 err = -EMSGSIZE; 2002 break; 2003 } 2004 /* advance number of filled vlans */ 2005 idx += range_end->vid - range_start->vid + 1; 2006 2007 range_start = v; 2008 } 2009 update_end: 2010 range_end = v; 2011 } 2012 2013 /* err will be 0 and range_start will be set in 3 cases here: 2014 * - first vlan (range_start == range_end) 2015 * - last vlan (range_start == range_end, not in range) 2016 * - last vlan range (range_start != range_end, in range) 2017 */ 2018 if (!err && range_start) { 2019 if (dump_global && 2020 !br_vlan_global_opts_fill(skb, range_start->vid, 2021 range_end->vid, range_start)) 2022 err = -EMSGSIZE; 2023 else if (!dump_global && 2024 !br_vlan_fill_vids(skb, range_start->vid, 2025 range_end->vid, range_start, 2026 br_vlan_flags(range_start, pvid), 2027 dump_stats)) 2028 err = -EMSGSIZE; 2029 } 2030 2031 cb->args[1] = err ? idx : 0; 2032 2033 nlmsg_end(skb, nlh); 2034 2035 return err; 2036 } 2037 2038 static const struct nla_policy br_vlan_db_dump_pol[BRIDGE_VLANDB_DUMP_MAX + 1] = { 2039 [BRIDGE_VLANDB_DUMP_FLAGS] = { .type = NLA_U32 }, 2040 }; 2041 2042 static int br_vlan_rtm_dump(struct sk_buff *skb, struct netlink_callback *cb) 2043 { 2044 struct nlattr *dtb[BRIDGE_VLANDB_DUMP_MAX + 1]; 2045 int idx = 0, err = 0, s_idx = cb->args[0]; 2046 struct net *net = sock_net(skb->sk); 2047 struct br_vlan_msg *bvm; 2048 struct net_device *dev; 2049 u32 dump_flags = 0; 2050 2051 err = nlmsg_parse(cb->nlh, sizeof(*bvm), dtb, BRIDGE_VLANDB_DUMP_MAX, 2052 br_vlan_db_dump_pol, cb->extack); 2053 if (err < 0) 2054 return err; 2055 2056 bvm = nlmsg_data(cb->nlh); 2057 if (dtb[BRIDGE_VLANDB_DUMP_FLAGS]) 2058 dump_flags = nla_get_u32(dtb[BRIDGE_VLANDB_DUMP_FLAGS]); 2059 2060 rcu_read_lock(); 2061 if (bvm->ifindex) { 2062 dev = dev_get_by_index_rcu(net, bvm->ifindex); 2063 if (!dev) { 2064 err = -ENODEV; 2065 goto out_err; 2066 } 2067 err = br_vlan_dump_dev(dev, skb, cb, dump_flags); 2068 /* if the dump completed without an error we return 0 here */ 2069 if (err != -EMSGSIZE) 2070 goto out_err; 2071 } else { 2072 for_each_netdev_rcu(net, dev) { 2073 if (idx < s_idx) 2074 goto skip; 2075 2076 err = br_vlan_dump_dev(dev, skb, cb, dump_flags); 2077 if (err == -EMSGSIZE) 2078 break; 2079 skip: 2080 idx++; 2081 } 2082 } 2083 cb->args[0] = idx; 2084 rcu_read_unlock(); 2085 2086 return skb->len; 2087 2088 out_err: 2089 rcu_read_unlock(); 2090 2091 return err; 2092 } 2093 2094 static const struct nla_policy br_vlan_db_policy[BRIDGE_VLANDB_ENTRY_MAX + 1] = { 2095 [BRIDGE_VLANDB_ENTRY_INFO] = 2096 NLA_POLICY_EXACT_LEN(sizeof(struct bridge_vlan_info)), 2097 [BRIDGE_VLANDB_ENTRY_RANGE] = { .type = NLA_U16 }, 2098 [BRIDGE_VLANDB_ENTRY_STATE] = { .type = NLA_U8 }, 2099 [BRIDGE_VLANDB_ENTRY_TUNNEL_INFO] = { .type = NLA_NESTED }, 2100 [BRIDGE_VLANDB_ENTRY_MCAST_ROUTER] = { .type = NLA_U8 }, 2101 }; 2102 2103 static int br_vlan_rtm_process_one(struct net_device *dev, 2104 const struct nlattr *attr, 2105 int cmd, struct netlink_ext_ack *extack) 2106 { 2107 struct bridge_vlan_info *vinfo, vrange_end, *vinfo_last = NULL; 2108 struct nlattr *tb[BRIDGE_VLANDB_ENTRY_MAX + 1]; 2109 bool changed = false, skip_processing = false; 2110 struct net_bridge_vlan_group *vg; 2111 struct net_bridge_port *p = NULL; 2112 int err = 0, cmdmap = 0; 2113 struct net_bridge *br; 2114 2115 if (netif_is_bridge_master(dev)) { 2116 br = netdev_priv(dev); 2117 vg = br_vlan_group(br); 2118 } else { 2119 p = br_port_get_rtnl(dev); 2120 if (WARN_ON(!p)) 2121 return -ENODEV; 2122 br = p->br; 2123 vg = nbp_vlan_group(p); 2124 } 2125 2126 if (WARN_ON(!vg)) 2127 return -ENODEV; 2128 2129 err = nla_parse_nested(tb, BRIDGE_VLANDB_ENTRY_MAX, attr, 2130 br_vlan_db_policy, extack); 2131 if (err) 2132 return err; 2133 2134 if (!tb[BRIDGE_VLANDB_ENTRY_INFO]) { 2135 NL_SET_ERR_MSG_MOD(extack, "Missing vlan entry info"); 2136 return -EINVAL; 2137 } 2138 memset(&vrange_end, 0, sizeof(vrange_end)); 2139 2140 vinfo = nla_data(tb[BRIDGE_VLANDB_ENTRY_INFO]); 2141 if (vinfo->flags & (BRIDGE_VLAN_INFO_RANGE_BEGIN | 2142 BRIDGE_VLAN_INFO_RANGE_END)) { 2143 NL_SET_ERR_MSG_MOD(extack, "Old-style vlan ranges are not allowed when using RTM vlan calls"); 2144 return -EINVAL; 2145 } 2146 if (!br_vlan_valid_id(vinfo->vid, extack)) 2147 return -EINVAL; 2148 2149 if (tb[BRIDGE_VLANDB_ENTRY_RANGE]) { 2150 vrange_end.vid = nla_get_u16(tb[BRIDGE_VLANDB_ENTRY_RANGE]); 2151 /* validate user-provided flags without RANGE_BEGIN */ 2152 vrange_end.flags = BRIDGE_VLAN_INFO_RANGE_END | vinfo->flags; 2153 vinfo->flags |= BRIDGE_VLAN_INFO_RANGE_BEGIN; 2154 2155 /* vinfo_last is the range start, vinfo the range end */ 2156 vinfo_last = vinfo; 2157 vinfo = &vrange_end; 2158 2159 if (!br_vlan_valid_id(vinfo->vid, extack) || 2160 !br_vlan_valid_range(vinfo, vinfo_last, extack)) 2161 return -EINVAL; 2162 } 2163 2164 switch (cmd) { 2165 case RTM_NEWVLAN: 2166 cmdmap = RTM_SETLINK; 2167 skip_processing = !!(vinfo->flags & BRIDGE_VLAN_INFO_ONLY_OPTS); 2168 break; 2169 case RTM_DELVLAN: 2170 cmdmap = RTM_DELLINK; 2171 break; 2172 } 2173 2174 if (!skip_processing) { 2175 struct bridge_vlan_info *tmp_last = vinfo_last; 2176 2177 /* br_process_vlan_info may overwrite vinfo_last */ 2178 err = br_process_vlan_info(br, p, cmdmap, vinfo, &tmp_last, 2179 &changed, extack); 2180 2181 /* notify first if anything changed */ 2182 if (changed) 2183 br_ifinfo_notify(cmdmap, br, p); 2184 2185 if (err) 2186 return err; 2187 } 2188 2189 /* deal with options */ 2190 if (cmd == RTM_NEWVLAN) { 2191 struct net_bridge_vlan *range_start, *range_end; 2192 2193 if (vinfo_last) { 2194 range_start = br_vlan_find(vg, vinfo_last->vid); 2195 range_end = br_vlan_find(vg, vinfo->vid); 2196 } else { 2197 range_start = br_vlan_find(vg, vinfo->vid); 2198 range_end = range_start; 2199 } 2200 2201 err = br_vlan_process_options(br, p, range_start, range_end, 2202 tb, extack); 2203 } 2204 2205 return err; 2206 } 2207 2208 static int br_vlan_rtm_process(struct sk_buff *skb, struct nlmsghdr *nlh, 2209 struct netlink_ext_ack *extack) 2210 { 2211 struct net *net = sock_net(skb->sk); 2212 struct br_vlan_msg *bvm; 2213 struct net_device *dev; 2214 struct nlattr *attr; 2215 int err, vlans = 0; 2216 int rem; 2217 2218 /* this should validate the header and check for remaining bytes */ 2219 err = nlmsg_parse(nlh, sizeof(*bvm), NULL, BRIDGE_VLANDB_MAX, NULL, 2220 extack); 2221 if (err < 0) 2222 return err; 2223 2224 bvm = nlmsg_data(nlh); 2225 dev = __dev_get_by_index(net, bvm->ifindex); 2226 if (!dev) 2227 return -ENODEV; 2228 2229 if (!netif_is_bridge_master(dev) && !netif_is_bridge_port(dev)) { 2230 NL_SET_ERR_MSG_MOD(extack, "The device is not a valid bridge or bridge port"); 2231 return -EINVAL; 2232 } 2233 2234 nlmsg_for_each_attr(attr, nlh, sizeof(*bvm), rem) { 2235 switch (nla_type(attr)) { 2236 case BRIDGE_VLANDB_ENTRY: 2237 err = br_vlan_rtm_process_one(dev, attr, 2238 nlh->nlmsg_type, 2239 extack); 2240 break; 2241 case BRIDGE_VLANDB_GLOBAL_OPTIONS: 2242 err = br_vlan_rtm_process_global_options(dev, attr, 2243 nlh->nlmsg_type, 2244 extack); 2245 break; 2246 default: 2247 continue; 2248 } 2249 2250 vlans++; 2251 if (err) 2252 break; 2253 } 2254 if (!vlans) { 2255 NL_SET_ERR_MSG_MOD(extack, "No vlans found to process"); 2256 err = -EINVAL; 2257 } 2258 2259 return err; 2260 } 2261 2262 void br_vlan_rtnl_init(void) 2263 { 2264 rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_GETVLAN, NULL, 2265 br_vlan_rtm_dump, 0); 2266 rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_NEWVLAN, 2267 br_vlan_rtm_process, NULL, 0); 2268 rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_DELVLAN, 2269 br_vlan_rtm_process, NULL, 0); 2270 } 2271 2272 void br_vlan_rtnl_uninit(void) 2273 { 2274 rtnl_unregister(PF_BRIDGE, RTM_GETVLAN); 2275 rtnl_unregister(PF_BRIDGE, RTM_NEWVLAN); 2276 rtnl_unregister(PF_BRIDGE, RTM_DELVLAN); 2277 } 2278