rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 1 | #include <linux/kernel.h> |
| 2 | #include <linux/netdevice.h> |
| 3 | #include <linux/rtnetlink.h> |
| 4 | #include <linux/slab.h> |
| 5 | #include <net/switchdev.h> |
| 6 | |
| 7 | #include "br_private.h" |
| 8 | #include "br_private_tunnel.h" |
| 9 | |
| 10 | static inline int br_vlan_cmp(struct rhashtable_compare_arg *arg, |
| 11 | const void *ptr) |
| 12 | { |
| 13 | const struct net_bridge_vlan *vle = ptr; |
| 14 | u16 vid = *(u16 *)arg->key; |
| 15 | |
| 16 | return vle->vid != vid; |
| 17 | } |
| 18 | |
| 19 | static const struct rhashtable_params br_vlan_rht_params = { |
| 20 | .head_offset = offsetof(struct net_bridge_vlan, vnode), |
| 21 | .key_offset = offsetof(struct net_bridge_vlan, vid), |
| 22 | .key_len = sizeof(u16), |
| 23 | .nelem_hint = 3, |
| 24 | .locks_mul = 1, |
| 25 | .max_size = VLAN_N_VID, |
| 26 | .obj_cmpfn = br_vlan_cmp, |
| 27 | .automatic_shrinking = true, |
| 28 | }; |
| 29 | |
| 30 | static struct net_bridge_vlan *br_vlan_lookup(struct rhashtable *tbl, u16 vid) |
| 31 | { |
| 32 | return rhashtable_lookup_fast(tbl, &vid, br_vlan_rht_params); |
| 33 | } |
| 34 | |
| 35 | static void __vlan_add_pvid(struct net_bridge_vlan_group *vg, u16 vid) |
| 36 | { |
| 37 | if (vg->pvid == vid) |
| 38 | return; |
| 39 | |
| 40 | smp_wmb(); |
| 41 | vg->pvid = vid; |
| 42 | } |
| 43 | |
| 44 | static void __vlan_delete_pvid(struct net_bridge_vlan_group *vg, u16 vid) |
| 45 | { |
| 46 | if (vg->pvid != vid) |
| 47 | return; |
| 48 | |
| 49 | smp_wmb(); |
| 50 | vg->pvid = 0; |
| 51 | } |
| 52 | |
| 53 | static void __vlan_add_flags(struct net_bridge_vlan *v, u16 flags) |
| 54 | { |
| 55 | struct net_bridge_vlan_group *vg; |
| 56 | |
| 57 | if (br_vlan_is_master(v)) |
| 58 | vg = br_vlan_group(v->br); |
| 59 | else |
| 60 | vg = nbp_vlan_group(v->port); |
| 61 | |
| 62 | if (flags & BRIDGE_VLAN_INFO_PVID) |
| 63 | __vlan_add_pvid(vg, v->vid); |
| 64 | else |
| 65 | __vlan_delete_pvid(vg, v->vid); |
| 66 | |
| 67 | if (flags & BRIDGE_VLAN_INFO_UNTAGGED) |
| 68 | v->flags |= BRIDGE_VLAN_INFO_UNTAGGED; |
| 69 | else |
| 70 | v->flags &= ~BRIDGE_VLAN_INFO_UNTAGGED; |
| 71 | } |
| 72 | |
| 73 | static int __vlan_vid_add(struct net_device *dev, struct net_bridge *br, |
| 74 | u16 vid, u16 flags) |
| 75 | { |
| 76 | struct switchdev_obj_port_vlan v = { |
| 77 | .obj.orig_dev = dev, |
| 78 | .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN, |
| 79 | .flags = flags, |
| 80 | .vid_begin = vid, |
| 81 | .vid_end = vid, |
| 82 | }; |
| 83 | int err; |
| 84 | |
| 85 | /* Try switchdev op first. In case it is not supported, fallback to |
| 86 | * 8021q add. |
| 87 | */ |
| 88 | err = switchdev_port_obj_add(dev, &v.obj); |
| 89 | if (err == -EOPNOTSUPP) |
| 90 | return vlan_vid_add(dev, br->vlan_proto, vid); |
| 91 | return err; |
| 92 | } |
| 93 | |
| 94 | static void __vlan_add_list(struct net_bridge_vlan *v) |
| 95 | { |
| 96 | struct net_bridge_vlan_group *vg; |
| 97 | struct list_head *headp, *hpos; |
| 98 | struct net_bridge_vlan *vent; |
| 99 | |
| 100 | if (br_vlan_is_master(v)) |
| 101 | vg = br_vlan_group(v->br); |
| 102 | else |
| 103 | vg = nbp_vlan_group(v->port); |
| 104 | |
| 105 | headp = &vg->vlan_list; |
| 106 | list_for_each_prev(hpos, headp) { |
| 107 | vent = list_entry(hpos, struct net_bridge_vlan, vlist); |
| 108 | if (v->vid < vent->vid) |
| 109 | continue; |
| 110 | else |
| 111 | break; |
| 112 | } |
| 113 | list_add_rcu(&v->vlist, hpos); |
| 114 | } |
| 115 | |
| 116 | static void __vlan_del_list(struct net_bridge_vlan *v) |
| 117 | { |
| 118 | list_del_rcu(&v->vlist); |
| 119 | } |
| 120 | |
| 121 | static int __vlan_vid_del(struct net_device *dev, struct net_bridge *br, |
| 122 | u16 vid) |
| 123 | { |
| 124 | struct switchdev_obj_port_vlan v = { |
| 125 | .obj.orig_dev = dev, |
| 126 | .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN, |
| 127 | .vid_begin = vid, |
| 128 | .vid_end = vid, |
| 129 | }; |
| 130 | int err; |
| 131 | |
| 132 | /* Try switchdev op first. In case it is not supported, fallback to |
| 133 | * 8021q del. |
| 134 | */ |
| 135 | err = switchdev_port_obj_del(dev, &v.obj); |
| 136 | if (err == -EOPNOTSUPP) { |
| 137 | vlan_vid_del(dev, br->vlan_proto, vid); |
| 138 | return 0; |
| 139 | } |
| 140 | return err; |
| 141 | } |
| 142 | |
| 143 | /* Returns a master vlan, if it didn't exist it gets created. In all cases a |
| 144 | * a reference is taken to the master vlan before returning. |
| 145 | */ |
| 146 | static struct net_bridge_vlan *br_vlan_get_master(struct net_bridge *br, u16 vid) |
| 147 | { |
| 148 | struct net_bridge_vlan_group *vg; |
| 149 | struct net_bridge_vlan *masterv; |
| 150 | |
| 151 | vg = br_vlan_group(br); |
| 152 | masterv = br_vlan_find(vg, vid); |
| 153 | if (!masterv) { |
| 154 | /* missing global ctx, create it now */ |
| 155 | if (br_vlan_add(br, vid, 0)) |
| 156 | return NULL; |
| 157 | masterv = br_vlan_find(vg, vid); |
| 158 | if (WARN_ON(!masterv)) |
| 159 | return NULL; |
| 160 | refcount_set(&masterv->refcnt, 1); |
| 161 | return masterv; |
| 162 | } |
| 163 | refcount_inc(&masterv->refcnt); |
| 164 | |
| 165 | return masterv; |
| 166 | } |
| 167 | |
| 168 | static void br_master_vlan_rcu_free(struct rcu_head *rcu) |
| 169 | { |
| 170 | struct net_bridge_vlan *v; |
| 171 | |
| 172 | v = container_of(rcu, struct net_bridge_vlan, rcu); |
| 173 | WARN_ON(!br_vlan_is_master(v)); |
| 174 | free_percpu(v->stats); |
| 175 | v->stats = NULL; |
| 176 | kfree(v); |
| 177 | } |
| 178 | |
| 179 | static void br_vlan_put_master(struct net_bridge_vlan *masterv) |
| 180 | { |
| 181 | struct net_bridge_vlan_group *vg; |
| 182 | |
| 183 | if (!br_vlan_is_master(masterv)) |
| 184 | return; |
| 185 | |
| 186 | vg = br_vlan_group(masterv->br); |
| 187 | if (refcount_dec_and_test(&masterv->refcnt)) { |
| 188 | rhashtable_remove_fast(&vg->vlan_hash, |
| 189 | &masterv->vnode, br_vlan_rht_params); |
| 190 | __vlan_del_list(masterv); |
| 191 | call_rcu(&masterv->rcu, br_master_vlan_rcu_free); |
| 192 | } |
| 193 | } |
| 194 | |
| 195 | /* This is the shared VLAN add function which works for both ports and bridge |
| 196 | * devices. There are four possible calls to this function in terms of the |
| 197 | * vlan entry type: |
| 198 | * 1. vlan is being added on a port (no master flags, global entry exists) |
| 199 | * 2. vlan is being added on a bridge (both master and brentry flags) |
| 200 | * 3. vlan is being added on a port, but a global entry didn't exist which |
| 201 | * is being created right now (master flag set, brentry flag unset), the |
| 202 | * global entry is used for global per-vlan features, but not for filtering |
| 203 | * 4. same as 3 but with both master and brentry flags set so the entry |
| 204 | * will be used for filtering in both the port and the bridge |
| 205 | */ |
| 206 | static int __vlan_add(struct net_bridge_vlan *v, u16 flags) |
| 207 | { |
| 208 | struct net_bridge_vlan *masterv = NULL; |
| 209 | struct net_bridge_port *p = NULL; |
| 210 | struct net_bridge_vlan_group *vg; |
| 211 | struct net_device *dev; |
| 212 | struct net_bridge *br; |
| 213 | int err; |
| 214 | |
| 215 | if (br_vlan_is_master(v)) { |
| 216 | br = v->br; |
| 217 | dev = br->dev; |
| 218 | vg = br_vlan_group(br); |
| 219 | } else { |
| 220 | p = v->port; |
| 221 | br = p->br; |
| 222 | dev = p->dev; |
| 223 | vg = nbp_vlan_group(p); |
| 224 | } |
| 225 | |
| 226 | if (p) { |
| 227 | /* Add VLAN to the device filter if it is supported. |
| 228 | * This ensures tagged traffic enters the bridge when |
| 229 | * promiscuous mode is disabled by br_manage_promisc(). |
| 230 | */ |
| 231 | err = __vlan_vid_add(dev, br, v->vid, flags); |
| 232 | if (err) |
| 233 | goto out; |
| 234 | |
| 235 | /* need to work on the master vlan too */ |
| 236 | if (flags & BRIDGE_VLAN_INFO_MASTER) { |
| 237 | err = br_vlan_add(br, v->vid, flags | |
| 238 | BRIDGE_VLAN_INFO_BRENTRY); |
| 239 | if (err) |
| 240 | goto out_filt; |
| 241 | } |
| 242 | |
| 243 | masterv = br_vlan_get_master(br, v->vid); |
| 244 | if (!masterv) |
| 245 | goto out_filt; |
| 246 | v->brvlan = masterv; |
| 247 | v->stats = masterv->stats; |
| 248 | } |
| 249 | |
| 250 | /* Add the dev mac and count the vlan only if it's usable */ |
| 251 | if (br_vlan_should_use(v)) { |
| 252 | err = br_fdb_insert(br, p, dev->dev_addr, v->vid); |
| 253 | if (err) { |
| 254 | br_err(br, "failed insert local address into bridge forwarding table\n"); |
| 255 | goto out_filt; |
| 256 | } |
| 257 | vg->num_vlans++; |
| 258 | } |
| 259 | |
| 260 | err = rhashtable_lookup_insert_fast(&vg->vlan_hash, &v->vnode, |
| 261 | br_vlan_rht_params); |
| 262 | if (err) |
| 263 | goto out_fdb_insert; |
| 264 | |
| 265 | __vlan_add_list(v); |
| 266 | __vlan_add_flags(v, flags); |
| 267 | out: |
| 268 | return err; |
| 269 | |
| 270 | out_fdb_insert: |
| 271 | if (br_vlan_should_use(v)) { |
| 272 | br_fdb_find_delete_local(br, p, dev->dev_addr, v->vid); |
| 273 | vg->num_vlans--; |
| 274 | } |
| 275 | |
| 276 | out_filt: |
| 277 | if (p) { |
| 278 | __vlan_vid_del(dev, br, v->vid); |
| 279 | if (masterv) { |
| 280 | br_vlan_put_master(masterv); |
| 281 | v->brvlan = NULL; |
| 282 | } |
| 283 | } |
| 284 | |
| 285 | goto out; |
| 286 | } |
| 287 | |
| 288 | static int __vlan_del(struct net_bridge_vlan *v) |
| 289 | { |
| 290 | struct net_bridge_vlan *masterv = v; |
| 291 | struct net_bridge_vlan_group *vg; |
| 292 | struct net_bridge_port *p = NULL; |
| 293 | int err = 0; |
| 294 | |
| 295 | if (br_vlan_is_master(v)) { |
| 296 | vg = br_vlan_group(v->br); |
| 297 | } else { |
| 298 | p = v->port; |
| 299 | vg = nbp_vlan_group(v->port); |
| 300 | masterv = v->brvlan; |
| 301 | } |
| 302 | |
| 303 | __vlan_delete_pvid(vg, v->vid); |
| 304 | if (p) { |
| 305 | err = __vlan_vid_del(p->dev, p->br, v->vid); |
| 306 | if (err) |
| 307 | goto out; |
| 308 | } |
| 309 | |
| 310 | if (br_vlan_should_use(v)) { |
| 311 | v->flags &= ~BRIDGE_VLAN_INFO_BRENTRY; |
| 312 | vg->num_vlans--; |
| 313 | } |
| 314 | |
| 315 | if (masterv != v) { |
| 316 | vlan_tunnel_info_del(vg, v); |
| 317 | rhashtable_remove_fast(&vg->vlan_hash, &v->vnode, |
| 318 | br_vlan_rht_params); |
| 319 | __vlan_del_list(v); |
| 320 | kfree_rcu(v, rcu); |
| 321 | } |
| 322 | |
| 323 | br_vlan_put_master(masterv); |
| 324 | out: |
| 325 | return err; |
| 326 | } |
| 327 | |
| 328 | static void __vlan_group_free(struct net_bridge_vlan_group *vg) |
| 329 | { |
| 330 | WARN_ON(!list_empty(&vg->vlan_list)); |
| 331 | rhashtable_destroy(&vg->vlan_hash); |
| 332 | vlan_tunnel_deinit(vg); |
| 333 | kfree(vg); |
| 334 | } |
| 335 | |
| 336 | static void __vlan_flush(struct net_bridge_vlan_group *vg) |
| 337 | { |
| 338 | struct net_bridge_vlan *vlan, *tmp; |
| 339 | |
| 340 | __vlan_delete_pvid(vg, vg->pvid); |
| 341 | list_for_each_entry_safe(vlan, tmp, &vg->vlan_list, vlist) |
| 342 | __vlan_del(vlan); |
| 343 | } |
| 344 | |
| 345 | struct sk_buff *br_handle_vlan(struct net_bridge *br, |
| 346 | const struct net_bridge_port *p, |
| 347 | struct net_bridge_vlan_group *vg, |
| 348 | struct sk_buff *skb) |
| 349 | { |
| 350 | struct br_vlan_stats *stats; |
| 351 | struct net_bridge_vlan *v; |
| 352 | u16 vid; |
| 353 | |
| 354 | /* If this packet was not filtered at input, let it pass */ |
| 355 | if (!BR_INPUT_SKB_CB(skb)->vlan_filtered) |
| 356 | goto out; |
| 357 | |
| 358 | /* At this point, we know that the frame was filtered and contains |
| 359 | * a valid vlan id. If the vlan id has untagged flag set, |
| 360 | * send untagged; otherwise, send tagged. |
| 361 | */ |
| 362 | br_vlan_get_tag(skb, &vid); |
| 363 | v = br_vlan_find(vg, vid); |
| 364 | /* Vlan entry must be configured at this point. The |
| 365 | * only exception is the bridge is set in promisc mode and the |
| 366 | * packet is destined for the bridge device. In this case |
| 367 | * pass the packet as is. |
| 368 | */ |
| 369 | if (!v || !br_vlan_should_use(v)) { |
| 370 | if ((br->dev->flags & IFF_PROMISC) && skb->dev == br->dev) { |
| 371 | goto out; |
| 372 | } else { |
| 373 | kfree_skb(skb); |
| 374 | return NULL; |
| 375 | } |
| 376 | } |
| 377 | if (br->vlan_stats_enabled) { |
| 378 | stats = this_cpu_ptr(v->stats); |
| 379 | u64_stats_update_begin(&stats->syncp); |
| 380 | stats->tx_bytes += skb->len; |
| 381 | stats->tx_packets++; |
| 382 | u64_stats_update_end(&stats->syncp); |
| 383 | } |
| 384 | |
| 385 | if (v->flags & BRIDGE_VLAN_INFO_UNTAGGED) |
| 386 | skb->vlan_tci = 0; |
| 387 | |
| 388 | if (p && (p->flags & BR_VLAN_TUNNEL) && |
| 389 | br_handle_egress_vlan_tunnel(skb, v)) { |
| 390 | kfree_skb(skb); |
| 391 | return NULL; |
| 392 | } |
| 393 | out: |
| 394 | return skb; |
| 395 | } |
| 396 | |
| 397 | /* Called under RCU */ |
| 398 | static bool __allowed_ingress(const struct net_bridge *br, |
| 399 | struct net_bridge_vlan_group *vg, |
| 400 | struct sk_buff *skb, u16 *vid) |
| 401 | { |
| 402 | struct br_vlan_stats *stats; |
| 403 | struct net_bridge_vlan *v; |
| 404 | bool tagged; |
| 405 | |
| 406 | BR_INPUT_SKB_CB(skb)->vlan_filtered = true; |
| 407 | /* If vlan tx offload is disabled on bridge device and frame was |
| 408 | * sent from vlan device on the bridge device, it does not have |
| 409 | * HW accelerated vlan tag. |
| 410 | */ |
| 411 | if (unlikely(!skb_vlan_tag_present(skb) && |
| 412 | skb->protocol == br->vlan_proto)) { |
| 413 | skb = skb_vlan_untag(skb); |
| 414 | if (unlikely(!skb)) |
| 415 | return false; |
| 416 | } |
| 417 | |
| 418 | if (!br_vlan_get_tag(skb, vid)) { |
| 419 | /* Tagged frame */ |
| 420 | if (skb->vlan_proto != br->vlan_proto) { |
| 421 | /* Protocol-mismatch, empty out vlan_tci for new tag */ |
| 422 | skb_push(skb, ETH_HLEN); |
| 423 | skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto, |
| 424 | skb_vlan_tag_get(skb)); |
| 425 | if (unlikely(!skb)) |
| 426 | return false; |
| 427 | |
| 428 | skb_pull(skb, ETH_HLEN); |
| 429 | skb_reset_mac_len(skb); |
| 430 | *vid = 0; |
| 431 | tagged = false; |
| 432 | } else { |
| 433 | tagged = true; |
| 434 | } |
| 435 | } else { |
| 436 | /* Untagged frame */ |
| 437 | tagged = false; |
| 438 | } |
| 439 | |
| 440 | if (!*vid) { |
| 441 | u16 pvid = br_get_pvid(vg); |
| 442 | |
| 443 | /* Frame had a tag with VID 0 or did not have a tag. |
| 444 | * See if pvid is set on this port. That tells us which |
| 445 | * vlan untagged or priority-tagged traffic belongs to. |
| 446 | */ |
| 447 | if (!pvid) |
| 448 | goto drop; |
| 449 | |
| 450 | /* PVID is set on this port. Any untagged or priority-tagged |
| 451 | * ingress frame is considered to belong to this vlan. |
| 452 | */ |
| 453 | *vid = pvid; |
| 454 | if (likely(!tagged)) |
| 455 | /* Untagged Frame. */ |
| 456 | __vlan_hwaccel_put_tag(skb, br->vlan_proto, pvid); |
| 457 | else |
| 458 | /* Priority-tagged Frame. |
| 459 | * At this point, We know that skb->vlan_tci had |
| 460 | * VLAN_TAG_PRESENT bit and its VID field was 0x000. |
| 461 | * We update only VID field and preserve PCP field. |
| 462 | */ |
| 463 | skb->vlan_tci |= pvid; |
| 464 | |
| 465 | /* if stats are disabled we can avoid the lookup */ |
| 466 | if (!br->vlan_stats_enabled) |
| 467 | return true; |
| 468 | } |
| 469 | v = br_vlan_find(vg, *vid); |
| 470 | if (!v || !br_vlan_should_use(v)) |
| 471 | goto drop; |
| 472 | |
| 473 | if (br->vlan_stats_enabled) { |
| 474 | stats = this_cpu_ptr(v->stats); |
| 475 | u64_stats_update_begin(&stats->syncp); |
| 476 | stats->rx_bytes += skb->len; |
| 477 | stats->rx_packets++; |
| 478 | u64_stats_update_end(&stats->syncp); |
| 479 | } |
| 480 | |
| 481 | return true; |
| 482 | |
| 483 | drop: |
| 484 | kfree_skb(skb); |
| 485 | return false; |
| 486 | } |
| 487 | |
| 488 | bool br_allowed_ingress(const struct net_bridge *br, |
| 489 | struct net_bridge_vlan_group *vg, struct sk_buff *skb, |
| 490 | u16 *vid) |
| 491 | { |
| 492 | /* If VLAN filtering is disabled on the bridge, all packets are |
| 493 | * permitted. |
| 494 | */ |
| 495 | if (!br->vlan_enabled) { |
| 496 | BR_INPUT_SKB_CB(skb)->vlan_filtered = false; |
| 497 | return true; |
| 498 | } |
| 499 | |
| 500 | return __allowed_ingress(br, vg, skb, vid); |
| 501 | } |
| 502 | |
| 503 | /* Called under RCU. */ |
| 504 | bool br_allowed_egress(struct net_bridge_vlan_group *vg, |
| 505 | const struct sk_buff *skb) |
| 506 | { |
| 507 | const struct net_bridge_vlan *v; |
| 508 | u16 vid; |
| 509 | |
| 510 | /* If this packet was not filtered at input, let it pass */ |
| 511 | if (!BR_INPUT_SKB_CB(skb)->vlan_filtered) |
| 512 | return true; |
| 513 | |
| 514 | br_vlan_get_tag(skb, &vid); |
| 515 | v = br_vlan_find(vg, vid); |
| 516 | if (v && br_vlan_should_use(v)) |
| 517 | return true; |
| 518 | |
| 519 | return false; |
| 520 | } |
| 521 | |
| 522 | /* Called under RCU */ |
| 523 | bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid) |
| 524 | { |
| 525 | struct net_bridge_vlan_group *vg; |
| 526 | struct net_bridge *br = p->br; |
| 527 | |
| 528 | /* If filtering was disabled at input, let it pass. */ |
| 529 | if (!br->vlan_enabled) |
| 530 | return true; |
| 531 | |
| 532 | vg = nbp_vlan_group_rcu(p); |
| 533 | if (!vg || !vg->num_vlans) |
| 534 | return false; |
| 535 | |
| 536 | if (!br_vlan_get_tag(skb, vid) && skb->vlan_proto != br->vlan_proto) |
| 537 | *vid = 0; |
| 538 | |
| 539 | if (!*vid) { |
| 540 | *vid = br_get_pvid(vg); |
| 541 | if (!*vid) |
| 542 | return false; |
| 543 | |
| 544 | return true; |
| 545 | } |
| 546 | |
| 547 | if (br_vlan_find(vg, *vid)) |
| 548 | return true; |
| 549 | |
| 550 | return false; |
| 551 | } |
| 552 | |
| 553 | /* Must be protected by RTNL. |
| 554 | * Must be called with vid in range from 1 to 4094 inclusive. |
| 555 | */ |
| 556 | int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags) |
| 557 | { |
| 558 | struct net_bridge_vlan_group *vg; |
| 559 | struct net_bridge_vlan *vlan; |
| 560 | int ret; |
| 561 | |
| 562 | ASSERT_RTNL(); |
| 563 | |
| 564 | vg = br_vlan_group(br); |
| 565 | vlan = br_vlan_find(vg, vid); |
| 566 | if (vlan) { |
| 567 | if (!br_vlan_is_brentry(vlan)) { |
| 568 | /* Trying to change flags of non-existent bridge vlan */ |
| 569 | if (!(flags & BRIDGE_VLAN_INFO_BRENTRY)) |
| 570 | return -EINVAL; |
| 571 | /* It was only kept for port vlans, now make it real */ |
| 572 | ret = br_fdb_insert(br, NULL, br->dev->dev_addr, |
| 573 | vlan->vid); |
| 574 | if (ret) { |
| 575 | br_err(br, "failed insert local address into bridge forwarding table\n"); |
| 576 | return ret; |
| 577 | } |
| 578 | refcount_inc(&vlan->refcnt); |
| 579 | vlan->flags |= BRIDGE_VLAN_INFO_BRENTRY; |
| 580 | vg->num_vlans++; |
| 581 | } |
| 582 | __vlan_add_flags(vlan, flags); |
| 583 | return 0; |
| 584 | } |
| 585 | |
| 586 | vlan = kzalloc(sizeof(*vlan), GFP_KERNEL); |
| 587 | if (!vlan) |
| 588 | return -ENOMEM; |
| 589 | |
| 590 | vlan->stats = netdev_alloc_pcpu_stats(struct br_vlan_stats); |
| 591 | if (!vlan->stats) { |
| 592 | kfree(vlan); |
| 593 | return -ENOMEM; |
| 594 | } |
| 595 | vlan->vid = vid; |
| 596 | vlan->flags = flags | BRIDGE_VLAN_INFO_MASTER; |
| 597 | vlan->flags &= ~BRIDGE_VLAN_INFO_PVID; |
| 598 | vlan->br = br; |
| 599 | if (flags & BRIDGE_VLAN_INFO_BRENTRY) |
| 600 | refcount_set(&vlan->refcnt, 1); |
| 601 | ret = __vlan_add(vlan, flags); |
| 602 | if (ret) { |
| 603 | free_percpu(vlan->stats); |
| 604 | kfree(vlan); |
| 605 | } |
| 606 | |
| 607 | return ret; |
| 608 | } |
| 609 | |
| 610 | /* Must be protected by RTNL. |
| 611 | * Must be called with vid in range from 1 to 4094 inclusive. |
| 612 | */ |
| 613 | int br_vlan_delete(struct net_bridge *br, u16 vid) |
| 614 | { |
| 615 | struct net_bridge_vlan_group *vg; |
| 616 | struct net_bridge_vlan *v; |
| 617 | |
| 618 | ASSERT_RTNL(); |
| 619 | |
| 620 | vg = br_vlan_group(br); |
| 621 | v = br_vlan_find(vg, vid); |
| 622 | if (!v || !br_vlan_is_brentry(v)) |
| 623 | return -ENOENT; |
| 624 | |
| 625 | br_fdb_find_delete_local(br, NULL, br->dev->dev_addr, vid); |
| 626 | br_fdb_delete_by_port(br, NULL, vid, 0); |
| 627 | |
| 628 | vlan_tunnel_info_del(vg, v); |
| 629 | |
| 630 | return __vlan_del(v); |
| 631 | } |
| 632 | |
| 633 | void br_vlan_flush(struct net_bridge *br) |
| 634 | { |
| 635 | struct net_bridge_vlan_group *vg; |
| 636 | |
| 637 | ASSERT_RTNL(); |
| 638 | |
| 639 | /* delete auto-added default pvid local fdb before flushing vlans |
| 640 | * otherwise it will be leaked on bridge device init failure |
| 641 | */ |
| 642 | br_fdb_delete_by_port(br, NULL, 0, 1); |
| 643 | |
| 644 | vg = br_vlan_group(br); |
| 645 | __vlan_flush(vg); |
| 646 | RCU_INIT_POINTER(br->vlgrp, NULL); |
| 647 | synchronize_rcu(); |
| 648 | __vlan_group_free(vg); |
| 649 | } |
| 650 | |
| 651 | struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid) |
| 652 | { |
| 653 | if (!vg) |
| 654 | return NULL; |
| 655 | |
| 656 | return br_vlan_lookup(&vg->vlan_hash, vid); |
| 657 | } |
| 658 | |
| 659 | /* Must be protected by RTNL. */ |
| 660 | static void recalculate_group_addr(struct net_bridge *br) |
| 661 | { |
| 662 | if (br->group_addr_set) |
| 663 | return; |
| 664 | |
| 665 | spin_lock_bh(&br->lock); |
| 666 | if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q)) { |
| 667 | /* Bridge Group Address */ |
| 668 | br->group_addr[5] = 0x00; |
| 669 | } else { /* vlan_enabled && ETH_P_8021AD */ |
| 670 | /* Provider Bridge Group Address */ |
| 671 | br->group_addr[5] = 0x08; |
| 672 | } |
| 673 | spin_unlock_bh(&br->lock); |
| 674 | } |
| 675 | |
| 676 | /* Must be protected by RTNL. */ |
| 677 | void br_recalculate_fwd_mask(struct net_bridge *br) |
| 678 | { |
| 679 | if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q)) |
| 680 | br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT; |
| 681 | else /* vlan_enabled && ETH_P_8021AD */ |
| 682 | br->group_fwd_mask_required = BR_GROUPFWD_8021AD & |
| 683 | ~(1u << br->group_addr[5]); |
| 684 | } |
| 685 | |
| 686 | int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val) |
| 687 | { |
| 688 | struct switchdev_attr attr = { |
| 689 | .orig_dev = br->dev, |
| 690 | .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING, |
| 691 | .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP, |
| 692 | .u.vlan_filtering = val, |
| 693 | }; |
| 694 | int err; |
| 695 | |
| 696 | if (br->vlan_enabled == val) |
| 697 | return 0; |
| 698 | |
| 699 | err = switchdev_port_attr_set(br->dev, &attr); |
| 700 | if (err && err != -EOPNOTSUPP) |
| 701 | return err; |
| 702 | |
| 703 | br->vlan_enabled = val; |
| 704 | br_manage_promisc(br); |
| 705 | recalculate_group_addr(br); |
| 706 | br_recalculate_fwd_mask(br); |
| 707 | |
| 708 | return 0; |
| 709 | } |
| 710 | |
| 711 | int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val) |
| 712 | { |
| 713 | return __br_vlan_filter_toggle(br, val); |
| 714 | } |
| 715 | |
| 716 | bool br_vlan_enabled(const struct net_device *dev) |
| 717 | { |
| 718 | struct net_bridge *br = netdev_priv(dev); |
| 719 | |
| 720 | return !!br->vlan_enabled; |
| 721 | } |
| 722 | EXPORT_SYMBOL_GPL(br_vlan_enabled); |
| 723 | |
| 724 | int __br_vlan_set_proto(struct net_bridge *br, __be16 proto) |
| 725 | { |
| 726 | int err = 0; |
| 727 | struct net_bridge_port *p; |
| 728 | struct net_bridge_vlan *vlan; |
| 729 | struct net_bridge_vlan_group *vg; |
| 730 | __be16 oldproto; |
| 731 | |
| 732 | if (br->vlan_proto == proto) |
| 733 | return 0; |
| 734 | |
| 735 | /* Add VLANs for the new proto to the device filter. */ |
| 736 | list_for_each_entry(p, &br->port_list, list) { |
| 737 | vg = nbp_vlan_group(p); |
| 738 | list_for_each_entry(vlan, &vg->vlan_list, vlist) { |
| 739 | err = vlan_vid_add(p->dev, proto, vlan->vid); |
| 740 | if (err) |
| 741 | goto err_filt; |
| 742 | } |
| 743 | } |
| 744 | |
| 745 | oldproto = br->vlan_proto; |
| 746 | br->vlan_proto = proto; |
| 747 | |
| 748 | recalculate_group_addr(br); |
| 749 | br_recalculate_fwd_mask(br); |
| 750 | |
| 751 | /* Delete VLANs for the old proto from the device filter. */ |
| 752 | list_for_each_entry(p, &br->port_list, list) { |
| 753 | vg = nbp_vlan_group(p); |
| 754 | list_for_each_entry(vlan, &vg->vlan_list, vlist) |
| 755 | vlan_vid_del(p->dev, oldproto, vlan->vid); |
| 756 | } |
| 757 | |
| 758 | return 0; |
| 759 | |
| 760 | err_filt: |
| 761 | list_for_each_entry_continue_reverse(vlan, &vg->vlan_list, vlist) |
| 762 | vlan_vid_del(p->dev, proto, vlan->vid); |
| 763 | |
| 764 | list_for_each_entry_continue_reverse(p, &br->port_list, list) { |
| 765 | vg = nbp_vlan_group(p); |
| 766 | list_for_each_entry(vlan, &vg->vlan_list, vlist) |
| 767 | vlan_vid_del(p->dev, proto, vlan->vid); |
| 768 | } |
| 769 | |
| 770 | return err; |
| 771 | } |
| 772 | |
| 773 | int br_vlan_set_proto(struct net_bridge *br, unsigned long val) |
| 774 | { |
| 775 | if (val != ETH_P_8021Q && val != ETH_P_8021AD) |
| 776 | return -EPROTONOSUPPORT; |
| 777 | |
| 778 | return __br_vlan_set_proto(br, htons(val)); |
| 779 | } |
| 780 | |
| 781 | int br_vlan_set_stats(struct net_bridge *br, unsigned long val) |
| 782 | { |
| 783 | switch (val) { |
| 784 | case 0: |
| 785 | case 1: |
| 786 | br->vlan_stats_enabled = val; |
| 787 | break; |
| 788 | default: |
| 789 | return -EINVAL; |
| 790 | } |
| 791 | |
| 792 | return 0; |
| 793 | } |
| 794 | |
| 795 | static bool vlan_default_pvid(struct net_bridge_vlan_group *vg, u16 vid) |
| 796 | { |
| 797 | struct net_bridge_vlan *v; |
| 798 | |
| 799 | if (vid != vg->pvid) |
| 800 | return false; |
| 801 | |
| 802 | v = br_vlan_lookup(&vg->vlan_hash, vid); |
| 803 | if (v && br_vlan_should_use(v) && |
| 804 | (v->flags & BRIDGE_VLAN_INFO_UNTAGGED)) |
| 805 | return true; |
| 806 | |
| 807 | return false; |
| 808 | } |
| 809 | |
| 810 | static void br_vlan_disable_default_pvid(struct net_bridge *br) |
| 811 | { |
| 812 | struct net_bridge_port *p; |
| 813 | u16 pvid = br->default_pvid; |
| 814 | |
| 815 | /* Disable default_pvid on all ports where it is still |
| 816 | * configured. |
| 817 | */ |
| 818 | if (vlan_default_pvid(br_vlan_group(br), pvid)) |
| 819 | br_vlan_delete(br, pvid); |
| 820 | |
| 821 | list_for_each_entry(p, &br->port_list, list) { |
| 822 | if (vlan_default_pvid(nbp_vlan_group(p), pvid)) |
| 823 | nbp_vlan_delete(p, pvid); |
| 824 | } |
| 825 | |
| 826 | br->default_pvid = 0; |
| 827 | } |
| 828 | |
| 829 | int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid) |
| 830 | { |
| 831 | const struct net_bridge_vlan *pvent; |
| 832 | struct net_bridge_vlan_group *vg; |
| 833 | struct net_bridge_port *p; |
| 834 | u16 old_pvid; |
| 835 | int err = 0; |
| 836 | unsigned long *changed; |
| 837 | |
| 838 | if (!pvid) { |
| 839 | br_vlan_disable_default_pvid(br); |
| 840 | return 0; |
| 841 | } |
| 842 | |
| 843 | changed = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long), |
| 844 | GFP_KERNEL); |
| 845 | if (!changed) |
| 846 | return -ENOMEM; |
| 847 | |
| 848 | old_pvid = br->default_pvid; |
| 849 | |
| 850 | /* Update default_pvid config only if we do not conflict with |
| 851 | * user configuration. |
| 852 | */ |
| 853 | vg = br_vlan_group(br); |
| 854 | pvent = br_vlan_find(vg, pvid); |
| 855 | if ((!old_pvid || vlan_default_pvid(vg, old_pvid)) && |
| 856 | (!pvent || !br_vlan_should_use(pvent))) { |
| 857 | err = br_vlan_add(br, pvid, |
| 858 | BRIDGE_VLAN_INFO_PVID | |
| 859 | BRIDGE_VLAN_INFO_UNTAGGED | |
| 860 | BRIDGE_VLAN_INFO_BRENTRY); |
| 861 | if (err) |
| 862 | goto out; |
| 863 | br_vlan_delete(br, old_pvid); |
| 864 | set_bit(0, changed); |
| 865 | } |
| 866 | |
| 867 | list_for_each_entry(p, &br->port_list, list) { |
| 868 | /* Update default_pvid config only if we do not conflict with |
| 869 | * user configuration. |
| 870 | */ |
| 871 | vg = nbp_vlan_group(p); |
| 872 | if ((old_pvid && |
| 873 | !vlan_default_pvid(vg, old_pvid)) || |
| 874 | br_vlan_find(vg, pvid)) |
| 875 | continue; |
| 876 | |
| 877 | err = nbp_vlan_add(p, pvid, |
| 878 | BRIDGE_VLAN_INFO_PVID | |
| 879 | BRIDGE_VLAN_INFO_UNTAGGED); |
| 880 | if (err) |
| 881 | goto err_port; |
| 882 | nbp_vlan_delete(p, old_pvid); |
| 883 | set_bit(p->port_no, changed); |
| 884 | } |
| 885 | |
| 886 | br->default_pvid = pvid; |
| 887 | |
| 888 | out: |
| 889 | kfree(changed); |
| 890 | return err; |
| 891 | |
| 892 | err_port: |
| 893 | list_for_each_entry_continue_reverse(p, &br->port_list, list) { |
| 894 | if (!test_bit(p->port_no, changed)) |
| 895 | continue; |
| 896 | |
| 897 | if (old_pvid) |
| 898 | nbp_vlan_add(p, old_pvid, |
| 899 | BRIDGE_VLAN_INFO_PVID | |
| 900 | BRIDGE_VLAN_INFO_UNTAGGED); |
| 901 | nbp_vlan_delete(p, pvid); |
| 902 | } |
| 903 | |
| 904 | if (test_bit(0, changed)) { |
| 905 | if (old_pvid) |
| 906 | br_vlan_add(br, old_pvid, |
| 907 | BRIDGE_VLAN_INFO_PVID | |
| 908 | BRIDGE_VLAN_INFO_UNTAGGED | |
| 909 | BRIDGE_VLAN_INFO_BRENTRY); |
| 910 | br_vlan_delete(br, pvid); |
| 911 | } |
| 912 | goto out; |
| 913 | } |
| 914 | |
| 915 | int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val) |
| 916 | { |
| 917 | u16 pvid = val; |
| 918 | int err = 0; |
| 919 | |
| 920 | if (val >= VLAN_VID_MASK) |
| 921 | return -EINVAL; |
| 922 | |
| 923 | if (pvid == br->default_pvid) |
| 924 | goto out; |
| 925 | |
| 926 | /* Only allow default pvid change when filtering is disabled */ |
| 927 | if (br->vlan_enabled) { |
| 928 | pr_info_once("Please disable vlan filtering to change default_pvid\n"); |
| 929 | err = -EPERM; |
| 930 | goto out; |
| 931 | } |
| 932 | err = __br_vlan_set_default_pvid(br, pvid); |
| 933 | out: |
| 934 | return err; |
| 935 | } |
| 936 | |
| 937 | int br_vlan_init(struct net_bridge *br) |
| 938 | { |
| 939 | struct net_bridge_vlan_group *vg; |
| 940 | int ret = -ENOMEM; |
| 941 | |
| 942 | vg = kzalloc(sizeof(*vg), GFP_KERNEL); |
| 943 | if (!vg) |
| 944 | goto out; |
| 945 | ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params); |
| 946 | if (ret) |
| 947 | goto err_rhtbl; |
| 948 | ret = vlan_tunnel_init(vg); |
| 949 | if (ret) |
| 950 | goto err_tunnel_init; |
| 951 | INIT_LIST_HEAD(&vg->vlan_list); |
| 952 | br->vlan_proto = htons(ETH_P_8021Q); |
| 953 | br->default_pvid = 1; |
| 954 | rcu_assign_pointer(br->vlgrp, vg); |
| 955 | ret = br_vlan_add(br, 1, |
| 956 | BRIDGE_VLAN_INFO_PVID | BRIDGE_VLAN_INFO_UNTAGGED | |
| 957 | BRIDGE_VLAN_INFO_BRENTRY); |
| 958 | if (ret) |
| 959 | goto err_vlan_add; |
| 960 | |
| 961 | out: |
| 962 | return ret; |
| 963 | |
| 964 | err_vlan_add: |
| 965 | vlan_tunnel_deinit(vg); |
| 966 | err_tunnel_init: |
| 967 | rhashtable_destroy(&vg->vlan_hash); |
| 968 | err_rhtbl: |
| 969 | kfree(vg); |
| 970 | |
| 971 | goto out; |
| 972 | } |
| 973 | |
| 974 | int nbp_vlan_init(struct net_bridge_port *p) |
| 975 | { |
| 976 | struct switchdev_attr attr = { |
| 977 | .orig_dev = p->br->dev, |
| 978 | .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING, |
| 979 | .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP, |
| 980 | .u.vlan_filtering = p->br->vlan_enabled, |
| 981 | }; |
| 982 | struct net_bridge_vlan_group *vg; |
| 983 | int ret = -ENOMEM; |
| 984 | |
| 985 | vg = kzalloc(sizeof(struct net_bridge_vlan_group), GFP_KERNEL); |
| 986 | if (!vg) |
| 987 | goto out; |
| 988 | |
| 989 | ret = switchdev_port_attr_set(p->dev, &attr); |
| 990 | if (ret && ret != -EOPNOTSUPP) |
| 991 | goto err_vlan_enabled; |
| 992 | |
| 993 | ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params); |
| 994 | if (ret) |
| 995 | goto err_rhtbl; |
| 996 | ret = vlan_tunnel_init(vg); |
| 997 | if (ret) |
| 998 | goto err_tunnel_init; |
| 999 | INIT_LIST_HEAD(&vg->vlan_list); |
| 1000 | rcu_assign_pointer(p->vlgrp, vg); |
| 1001 | if (p->br->default_pvid) { |
| 1002 | ret = nbp_vlan_add(p, p->br->default_pvid, |
| 1003 | BRIDGE_VLAN_INFO_PVID | |
| 1004 | BRIDGE_VLAN_INFO_UNTAGGED); |
| 1005 | if (ret) |
| 1006 | goto err_vlan_add; |
| 1007 | } |
| 1008 | out: |
| 1009 | return ret; |
| 1010 | |
| 1011 | err_vlan_add: |
| 1012 | RCU_INIT_POINTER(p->vlgrp, NULL); |
| 1013 | synchronize_rcu(); |
| 1014 | vlan_tunnel_deinit(vg); |
| 1015 | err_tunnel_init: |
| 1016 | rhashtable_destroy(&vg->vlan_hash); |
| 1017 | err_rhtbl: |
| 1018 | err_vlan_enabled: |
| 1019 | kfree(vg); |
| 1020 | |
| 1021 | goto out; |
| 1022 | } |
| 1023 | |
| 1024 | /* Must be protected by RTNL. |
| 1025 | * Must be called with vid in range from 1 to 4094 inclusive. |
| 1026 | */ |
| 1027 | int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags) |
| 1028 | { |
| 1029 | struct switchdev_obj_port_vlan v = { |
| 1030 | .obj.orig_dev = port->dev, |
| 1031 | .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN, |
| 1032 | .flags = flags, |
| 1033 | .vid_begin = vid, |
| 1034 | .vid_end = vid, |
| 1035 | }; |
| 1036 | struct net_bridge_vlan *vlan; |
| 1037 | int ret; |
| 1038 | |
| 1039 | ASSERT_RTNL(); |
| 1040 | |
| 1041 | vlan = br_vlan_find(nbp_vlan_group(port), vid); |
| 1042 | if (vlan) { |
| 1043 | /* Pass the flags to the hardware bridge */ |
| 1044 | ret = switchdev_port_obj_add(port->dev, &v.obj); |
| 1045 | if (ret && ret != -EOPNOTSUPP) |
| 1046 | return ret; |
| 1047 | __vlan_add_flags(vlan, flags); |
| 1048 | return 0; |
| 1049 | } |
| 1050 | |
| 1051 | vlan = kzalloc(sizeof(*vlan), GFP_KERNEL); |
| 1052 | if (!vlan) |
| 1053 | return -ENOMEM; |
| 1054 | |
| 1055 | vlan->vid = vid; |
| 1056 | vlan->port = port; |
| 1057 | ret = __vlan_add(vlan, flags); |
| 1058 | if (ret) |
| 1059 | kfree(vlan); |
| 1060 | |
| 1061 | return ret; |
| 1062 | } |
| 1063 | |
| 1064 | /* Must be protected by RTNL. |
| 1065 | * Must be called with vid in range from 1 to 4094 inclusive. |
| 1066 | */ |
| 1067 | int nbp_vlan_delete(struct net_bridge_port *port, u16 vid) |
| 1068 | { |
| 1069 | struct net_bridge_vlan *v; |
| 1070 | |
| 1071 | ASSERT_RTNL(); |
| 1072 | |
| 1073 | v = br_vlan_find(nbp_vlan_group(port), vid); |
| 1074 | if (!v) |
| 1075 | return -ENOENT; |
| 1076 | br_fdb_find_delete_local(port->br, port, port->dev->dev_addr, vid); |
| 1077 | br_fdb_delete_by_port(port->br, port, vid, 0); |
| 1078 | |
| 1079 | return __vlan_del(v); |
| 1080 | } |
| 1081 | |
| 1082 | void nbp_vlan_flush(struct net_bridge_port *port) |
| 1083 | { |
| 1084 | struct net_bridge_vlan_group *vg; |
| 1085 | |
| 1086 | ASSERT_RTNL(); |
| 1087 | |
| 1088 | vg = nbp_vlan_group(port); |
| 1089 | __vlan_flush(vg); |
| 1090 | RCU_INIT_POINTER(port->vlgrp, NULL); |
| 1091 | synchronize_rcu(); |
| 1092 | __vlan_group_free(vg); |
| 1093 | } |
| 1094 | |
| 1095 | void br_vlan_get_stats(const struct net_bridge_vlan *v, |
| 1096 | struct br_vlan_stats *stats) |
| 1097 | { |
| 1098 | int i; |
| 1099 | |
| 1100 | memset(stats, 0, sizeof(*stats)); |
| 1101 | for_each_possible_cpu(i) { |
| 1102 | u64 rxpackets, rxbytes, txpackets, txbytes; |
| 1103 | struct br_vlan_stats *cpu_stats; |
| 1104 | unsigned int start; |
| 1105 | |
| 1106 | cpu_stats = per_cpu_ptr(v->stats, i); |
| 1107 | do { |
| 1108 | start = u64_stats_fetch_begin_irq(&cpu_stats->syncp); |
| 1109 | rxpackets = cpu_stats->rx_packets; |
| 1110 | rxbytes = cpu_stats->rx_bytes; |
| 1111 | txbytes = cpu_stats->tx_bytes; |
| 1112 | txpackets = cpu_stats->tx_packets; |
| 1113 | } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start)); |
| 1114 | |
| 1115 | stats->rx_packets += rxpackets; |
| 1116 | stats->rx_bytes += rxbytes; |
| 1117 | stats->tx_bytes += txbytes; |
| 1118 | stats->tx_packets += txpackets; |
| 1119 | } |
| 1120 | } |