1 // SPDX-License-Identifier: GPL-2.0-or-later 2 3 #include <linux/bits.h> 4 #include <linux/bitfield.h> 5 #include <linux/idr.h> 6 #include <linux/kernel.h> 7 #include <linux/netdevice.h> 8 #include <linux/netlink.h> 9 #include <linux/skbuff.h> 10 #include <linux/xarray.h> 11 #include <net/devlink.h> 12 #include <net/net_shaper.h> 13 14 #include "shaper_nl_gen.h" 15 16 #include "../core/dev.h" 17 18 #define NET_SHAPER_SCOPE_SHIFT 26 19 #define NET_SHAPER_ID_MASK GENMASK(NET_SHAPER_SCOPE_SHIFT - 1, 0) 20 #define NET_SHAPER_SCOPE_MASK GENMASK(31, NET_SHAPER_SCOPE_SHIFT) 21 22 #define NET_SHAPER_ID_UNSPEC NET_SHAPER_ID_MASK 23 24 static_assert(NET_SHAPER_ID_UNSPEC == NET_SHAPER_MAX_HANDLE_ID + 1); 25 26 struct net_shaper_hierarchy { 27 struct xarray shapers; 28 }; 29 30 struct net_shaper_nl_ctx { 31 struct net_shaper_binding binding; 32 netdevice_tracker dev_tracker; 33 unsigned long start_index; 34 }; 35 36 static struct net_shaper_binding *net_shaper_binding_from_ctx(void *ctx) 37 { 38 return &((struct net_shaper_nl_ctx *)ctx)->binding; 39 } 40 41 static struct net_shaper_hierarchy * 42 net_shaper_hierarchy(struct net_shaper_binding *binding) 43 { 44 /* Pairs with WRITE_ONCE() in net_shaper_hierarchy_setup. */ 45 if (binding->type == NET_SHAPER_BINDING_TYPE_NETDEV) 46 return READ_ONCE(binding->netdev->net_shaper_hierarchy); 47 48 /* No other type supported yet. */ 49 return NULL; 50 } 51 52 static struct net_shaper_hierarchy * 53 net_shaper_hierarchy_rcu(struct net_shaper_binding *binding) 54 { 55 /* Readers look up the device and take a ref, then take RCU lock 56 * later at which point netdev may have been unregistered and flushed. 57 * READ_ONCE() pairs with WRITE_ONCE() in net_shaper_hierarchy_setup. 58 */ 59 if (binding->type == NET_SHAPER_BINDING_TYPE_NETDEV && 60 READ_ONCE(binding->netdev->reg_state) <= NETREG_REGISTERED) 61 return READ_ONCE(binding->netdev->net_shaper_hierarchy); 62 63 /* No other type supported yet. */ 64 return NULL; 65 } 66 67 static const struct net_shaper_ops * 68 net_shaper_ops(struct net_shaper_binding *binding) 69 { 70 if (binding->type == NET_SHAPER_BINDING_TYPE_NETDEV) 71 return binding->netdev->netdev_ops->net_shaper_ops; 72 73 /* No other type supported yet. */ 74 return NULL; 75 } 76 77 /* Count the number of [multi] attributes of the given type. */ 78 static int net_shaper_list_len(struct genl_info *info, int type) 79 { 80 struct nlattr *attr; 81 int rem, cnt = 0; 82 83 nla_for_each_attr_type(attr, type, genlmsg_data(info->genlhdr), 84 genlmsg_len(info->genlhdr), rem) 85 cnt++; 86 return cnt; 87 } 88 89 static int net_shaper_handle_size(void) 90 { 91 return nla_total_size(nla_total_size(sizeof(u32)) + 92 nla_total_size(sizeof(u32))); 93 } 94 95 static int net_shaper_group_reply_size(void) 96 { 97 return nla_total_size(sizeof(u32)) + /* NET_SHAPER_A_IFINDEX */ 98 net_shaper_handle_size(); /* NET_SHAPER_A_HANDLE */ 99 } 100 101 static int net_shaper_fill_binding(struct sk_buff *msg, 102 const struct net_shaper_binding *binding, 103 u32 type) 104 { 105 /* Should never happen, as currently only NETDEV is supported. */ 106 if (WARN_ON_ONCE(binding->type != NET_SHAPER_BINDING_TYPE_NETDEV)) 107 return -EINVAL; 108 109 if (nla_put_u32(msg, type, binding->netdev->ifindex)) 110 return -EMSGSIZE; 111 112 return 0; 113 } 114 115 static int net_shaper_fill_handle(struct sk_buff *msg, 116 const struct net_shaper_handle *handle, 117 u32 type) 118 { 119 struct nlattr *handle_attr; 120 121 if (handle->scope == NET_SHAPER_SCOPE_UNSPEC) 122 return 0; 123 124 handle_attr = nla_nest_start(msg, type); 125 if (!handle_attr) 126 return -EMSGSIZE; 127 128 if (nla_put_u32(msg, NET_SHAPER_A_HANDLE_SCOPE, handle->scope) || 129 (handle->scope >= NET_SHAPER_SCOPE_QUEUE && 130 nla_put_u32(msg, NET_SHAPER_A_HANDLE_ID, handle->id))) 131 goto handle_nest_cancel; 132 133 nla_nest_end(msg, handle_attr); 134 return 0; 135 136 handle_nest_cancel: 137 nla_nest_cancel(msg, handle_attr); 138 return -EMSGSIZE; 139 } 140 141 static void net_shaper_copy(struct net_shaper *dst, 142 const struct net_shaper *src) 143 { 144 WRITE_ONCE(dst->parent.scope, READ_ONCE(src->parent.scope)); 145 WRITE_ONCE(dst->parent.id, READ_ONCE(src->parent.id)); 146 WRITE_ONCE(dst->handle.scope, READ_ONCE(src->handle.scope)); 147 WRITE_ONCE(dst->handle.id, READ_ONCE(src->handle.id)); 148 149 WRITE_ONCE(dst->metric, READ_ONCE(src->metric)); 150 WRITE_ONCE(dst->bw_min, READ_ONCE(src->bw_min)); 151 WRITE_ONCE(dst->bw_max, READ_ONCE(src->bw_max)); 152 WRITE_ONCE(dst->burst, READ_ONCE(src->burst)); 153 WRITE_ONCE(dst->priority, READ_ONCE(src->priority)); 154 WRITE_ONCE(dst->weight, READ_ONCE(src->weight)); 155 156 /* private fields are only used on the write path under the lock */ 157 data_race(dst->leaves = src->leaves); 158 } 159 160 static int 161 net_shaper_fill_one(struct sk_buff *msg, 162 const struct net_shaper_binding *binding, 163 const struct net_shaper *shaper, 164 const struct genl_info *info) 165 { 166 struct net_shaper cur; 167 void *hdr; 168 169 hdr = genlmsg_iput(msg, info); 170 if (!hdr) 171 return -EMSGSIZE; 172 173 /* Make a copy to avoid data races */ 174 net_shaper_copy(&cur, shaper); 175 176 if (net_shaper_fill_binding(msg, binding, NET_SHAPER_A_IFINDEX) || 177 net_shaper_fill_handle(msg, &cur.parent, 178 NET_SHAPER_A_PARENT) || 179 net_shaper_fill_handle(msg, &cur.handle, 180 NET_SHAPER_A_HANDLE) || 181 ((cur.bw_min || cur.bw_max || cur.burst) && 182 nla_put_u32(msg, NET_SHAPER_A_METRIC, cur.metric)) || 183 (cur.bw_min && 184 nla_put_uint(msg, NET_SHAPER_A_BW_MIN, cur.bw_min)) || 185 (cur.bw_max && 186 nla_put_uint(msg, NET_SHAPER_A_BW_MAX, cur.bw_max)) || 187 (cur.burst && 188 nla_put_uint(msg, NET_SHAPER_A_BURST, cur.burst)) || 189 (cur.priority && 190 nla_put_u32(msg, NET_SHAPER_A_PRIORITY, cur.priority)) || 191 (cur.weight && 192 nla_put_u32(msg, NET_SHAPER_A_WEIGHT, cur.weight))) 193 goto nla_put_failure; 194 195 genlmsg_end(msg, hdr); 196 197 return 0; 198 199 nla_put_failure: 200 genlmsg_cancel(msg, hdr); 201 return -EMSGSIZE; 202 } 203 204 /* Initialize the context fetching the relevant device and 205 * acquiring a reference to it. 206 */ 207 static int net_shaper_ctx_setup(const struct genl_info *info, int type, 208 struct net_shaper_nl_ctx *ctx) 209 { 210 struct net *ns = genl_info_net(info); 211 struct net_device *dev; 212 int ifindex; 213 214 if (GENL_REQ_ATTR_CHECK(info, type)) 215 return -EINVAL; 216 217 ifindex = nla_get_u32(info->attrs[type]); 218 dev = netdev_get_by_index(ns, ifindex, &ctx->dev_tracker, GFP_KERNEL); 219 if (!dev) { 220 NL_SET_BAD_ATTR(info->extack, info->attrs[type]); 221 return -ENOENT; 222 } 223 224 if (!dev->netdev_ops->net_shaper_ops) { 225 NL_SET_BAD_ATTR(info->extack, info->attrs[type]); 226 netdev_put(dev, &ctx->dev_tracker); 227 return -EOPNOTSUPP; 228 } 229 230 ctx->binding.type = NET_SHAPER_BINDING_TYPE_NETDEV; 231 ctx->binding.netdev = dev; 232 return 0; 233 } 234 235 /* Like net_shaper_ctx_setup(), but for "write" handlers (never for dumps!) 236 * Acquires the lock protecting the hierarchy (instance lock for netdev). 237 */ 238 static int net_shaper_ctx_setup_lock(const struct genl_info *info, int type, 239 struct net_shaper_nl_ctx *ctx) 240 { 241 struct net *ns = genl_info_net(info); 242 struct net_device *dev; 243 int ifindex; 244 245 if (GENL_REQ_ATTR_CHECK(info, type)) 246 return -EINVAL; 247 248 ifindex = nla_get_u32(info->attrs[type]); 249 dev = netdev_get_by_index_lock(ns, ifindex); 250 if (!dev) { 251 NL_SET_BAD_ATTR(info->extack, info->attrs[type]); 252 return -ENOENT; 253 } 254 255 if (!dev->netdev_ops->net_shaper_ops) { 256 NL_SET_BAD_ATTR(info->extack, info->attrs[type]); 257 netdev_unlock(dev); 258 return -EOPNOTSUPP; 259 } 260 261 ctx->binding.type = NET_SHAPER_BINDING_TYPE_NETDEV; 262 ctx->binding.netdev = dev; 263 return 0; 264 } 265 266 static void net_shaper_ctx_cleanup(struct net_shaper_nl_ctx *ctx) 267 { 268 if (ctx->binding.type == NET_SHAPER_BINDING_TYPE_NETDEV) 269 netdev_put(ctx->binding.netdev, &ctx->dev_tracker); 270 } 271 272 static void net_shaper_ctx_cleanup_unlock(struct net_shaper_nl_ctx *ctx) 273 { 274 if (ctx->binding.type == NET_SHAPER_BINDING_TYPE_NETDEV) 275 netdev_unlock(ctx->binding.netdev); 276 } 277 278 static u32 net_shaper_handle_to_index(const struct net_shaper_handle *handle) 279 { 280 return FIELD_PREP(NET_SHAPER_SCOPE_MASK, handle->scope) | 281 FIELD_PREP(NET_SHAPER_ID_MASK, handle->id); 282 } 283 284 static void net_shaper_index_to_handle(u32 index, 285 struct net_shaper_handle *handle) 286 { 287 handle->scope = FIELD_GET(NET_SHAPER_SCOPE_MASK, index); 288 handle->id = FIELD_GET(NET_SHAPER_ID_MASK, index); 289 } 290 291 static void net_shaper_default_parent(const struct net_shaper_handle *handle, 292 struct net_shaper_handle *parent) 293 { 294 switch (handle->scope) { 295 case NET_SHAPER_SCOPE_UNSPEC: 296 case NET_SHAPER_SCOPE_NETDEV: 297 case __NET_SHAPER_SCOPE_MAX: 298 parent->scope = NET_SHAPER_SCOPE_UNSPEC; 299 break; 300 301 case NET_SHAPER_SCOPE_QUEUE: 302 case NET_SHAPER_SCOPE_NODE: 303 parent->scope = NET_SHAPER_SCOPE_NETDEV; 304 break; 305 } 306 parent->id = 0; 307 } 308 309 static struct net_shaper * 310 net_shaper_lookup(struct net_shaper_binding *binding, 311 const struct net_shaper_handle *handle) 312 { 313 u32 index = net_shaper_handle_to_index(handle); 314 struct net_shaper_hierarchy *hierarchy; 315 struct net_shaper *cur; 316 317 hierarchy = net_shaper_hierarchy_rcu(binding); 318 if (!hierarchy) 319 return NULL; 320 321 cur = xa_load(&hierarchy->shapers, index); 322 /* Check valid before reading fields */ 323 if (!cur || !smp_load_acquire(&cur->valid)) 324 return NULL; 325 326 return cur; 327 } 328 329 /* Allocate on demand the per device shaper's hierarchy container. 330 * Called under the lock protecting the hierarchy (instance lock for netdev) 331 */ 332 static struct net_shaper_hierarchy * 333 net_shaper_hierarchy_setup(struct net_shaper_binding *binding) 334 { 335 struct net_shaper_hierarchy *hierarchy = net_shaper_hierarchy(binding); 336 337 if (hierarchy) 338 return hierarchy; 339 340 hierarchy = kmalloc_obj(*hierarchy); 341 if (!hierarchy) 342 return NULL; 343 344 /* The flag is required for ID allocation */ 345 xa_init_flags(&hierarchy->shapers, XA_FLAGS_ALLOC); 346 347 switch (binding->type) { 348 case NET_SHAPER_BINDING_TYPE_NETDEV: 349 /* Pairs with READ_ONCE in net_shaper_hierarchy. */ 350 WRITE_ONCE(binding->netdev->net_shaper_hierarchy, hierarchy); 351 break; 352 } 353 return hierarchy; 354 } 355 356 /* Prepare the hierarchy container to actually insert the given shaper, doing 357 * in advance the needed allocations. 358 */ 359 static int net_shaper_pre_insert(struct net_shaper_binding *binding, 360 struct net_shaper_handle *handle, 361 struct netlink_ext_ack *extack) 362 { 363 struct net_shaper_hierarchy *hierarchy = net_shaper_hierarchy(binding); 364 struct net_shaper *prev, *cur; 365 bool id_allocated = false; 366 int ret, index; 367 368 if (!hierarchy) 369 return -ENOMEM; 370 371 index = net_shaper_handle_to_index(handle); 372 cur = xa_load(&hierarchy->shapers, index); 373 if (cur) 374 return 0; 375 376 /* Allocated a new id, if needed. */ 377 if (handle->scope == NET_SHAPER_SCOPE_NODE && 378 handle->id == NET_SHAPER_ID_UNSPEC) { 379 u32 min, max; 380 381 handle->id = NET_SHAPER_MAX_HANDLE_ID; 382 max = net_shaper_handle_to_index(handle); 383 handle->id = 0; 384 min = net_shaper_handle_to_index(handle); 385 386 ret = xa_alloc(&hierarchy->shapers, &index, NULL, 387 XA_LIMIT(min, max), GFP_KERNEL); 388 if (ret < 0) { 389 NL_SET_ERR_MSG(extack, "Can't allocate new id for NODE shaper"); 390 return ret; 391 } 392 393 net_shaper_index_to_handle(index, handle); 394 id_allocated = true; 395 } 396 397 cur = kzalloc_obj(*cur); 398 if (!cur) { 399 ret = -ENOMEM; 400 goto free_id; 401 } 402 403 /* Insert as 'tentative' (no VALID mark). The mark will be set by 404 * net_shaper_commit() once the driver-side configuration succeeds. 405 */ 406 prev = xa_store(&hierarchy->shapers, index, cur, GFP_KERNEL); 407 if (xa_err(prev)) { 408 NL_SET_ERR_MSG(extack, "Can't insert shaper into device store"); 409 kfree_rcu(cur, rcu); 410 ret = xa_err(prev); 411 goto free_id; 412 } 413 return 0; 414 415 free_id: 416 if (id_allocated) 417 xa_erase(&hierarchy->shapers, index); 418 return ret; 419 } 420 421 /* Commit the tentative insert with the actual values. 422 * Must be called only after a successful net_shaper_pre_insert(). 423 */ 424 static void net_shaper_commit(struct net_shaper_binding *binding, 425 int nr_shapers, const struct net_shaper *shapers) 426 { 427 struct net_shaper_hierarchy *hierarchy = net_shaper_hierarchy(binding); 428 struct net_shaper *cur; 429 int index; 430 int i; 431 432 xa_lock(&hierarchy->shapers); 433 for (i = 0; i < nr_shapers; ++i) { 434 index = net_shaper_handle_to_index(&shapers[i].handle); 435 436 cur = xa_load(&hierarchy->shapers, index); 437 if (WARN_ON_ONCE(!cur)) 438 continue; 439 440 /* Successful update: update the hierarchy container... */ 441 net_shaper_copy(cur, &shapers[i]); 442 /* ... publish to lockless readers. */ 443 smp_store_release(&cur->valid, true); 444 } 445 xa_unlock(&hierarchy->shapers); 446 } 447 448 /* Rollback all the tentative inserts from the hierarchy. */ 449 static void net_shaper_rollback(struct net_shaper_binding *binding) 450 { 451 struct net_shaper_hierarchy *hierarchy = net_shaper_hierarchy(binding); 452 struct net_shaper *cur; 453 unsigned long index; 454 455 if (!hierarchy) 456 return; 457 458 xa_lock(&hierarchy->shapers); 459 xa_for_each(&hierarchy->shapers, index, cur) { 460 if (cur->valid) 461 continue; 462 __xa_erase(&hierarchy->shapers, index); 463 kfree_rcu(cur, rcu); 464 } 465 xa_unlock(&hierarchy->shapers); 466 } 467 468 static int net_shaper_parse_handle(const struct nlattr *attr, 469 const struct genl_info *info, 470 struct net_shaper_handle *handle) 471 { 472 struct nlattr *tb[NET_SHAPER_A_HANDLE_MAX + 1]; 473 struct nlattr *id_attr; 474 u32 id = 0; 475 int ret; 476 477 ret = nla_parse_nested(tb, NET_SHAPER_A_HANDLE_MAX, attr, 478 net_shaper_handle_nl_policy, info->extack); 479 if (ret < 0) 480 return ret; 481 482 if (NL_REQ_ATTR_CHECK(info->extack, attr, tb, 483 NET_SHAPER_A_HANDLE_SCOPE)) 484 return -EINVAL; 485 486 handle->scope = nla_get_u32(tb[NET_SHAPER_A_HANDLE_SCOPE]); 487 488 /* The default id for NODE scope shapers is an invalid one 489 * to help the 'group' operation discriminate between new 490 * NODE shaper creation (ID_UNSPEC) and reuse of existing 491 * shaper (any other value). 492 */ 493 id_attr = tb[NET_SHAPER_A_HANDLE_ID]; 494 if (id_attr) { 495 id = nla_get_u32(id_attr); 496 } else if (handle->scope == NET_SHAPER_SCOPE_NODE) { 497 id = NET_SHAPER_ID_UNSPEC; 498 } else if (handle->scope == NET_SHAPER_SCOPE_QUEUE) { 499 NL_SET_ERR_ATTR_MISS(info->extack, attr, 500 NET_SHAPER_A_HANDLE_ID); 501 return -EINVAL; 502 } 503 504 if (id && handle->scope == NET_SHAPER_SCOPE_NETDEV) { 505 NL_SET_ERR_MSG_ATTR(info->extack, id_attr, 506 "Netdev scope is a singleton, must use ID 0"); 507 return -EINVAL; 508 } 509 510 handle->id = id; 511 return 0; 512 } 513 514 static int net_shaper_validate_caps(struct net_shaper_binding *binding, 515 struct nlattr **tb, 516 const struct genl_info *info, 517 struct net_shaper *shaper) 518 { 519 const struct net_shaper_ops *ops = net_shaper_ops(binding); 520 struct nlattr *bad = NULL; 521 unsigned long caps = 0; 522 523 ops->capabilities(binding, shaper->handle.scope, &caps); 524 525 if (tb[NET_SHAPER_A_PRIORITY] && 526 !(caps & BIT(NET_SHAPER_A_CAPS_SUPPORT_PRIORITY))) 527 bad = tb[NET_SHAPER_A_PRIORITY]; 528 if (tb[NET_SHAPER_A_WEIGHT] && 529 !(caps & BIT(NET_SHAPER_A_CAPS_SUPPORT_WEIGHT))) 530 bad = tb[NET_SHAPER_A_WEIGHT]; 531 if (tb[NET_SHAPER_A_BW_MIN] && 532 !(caps & BIT(NET_SHAPER_A_CAPS_SUPPORT_BW_MIN))) 533 bad = tb[NET_SHAPER_A_BW_MIN]; 534 if (tb[NET_SHAPER_A_BW_MAX] && 535 !(caps & BIT(NET_SHAPER_A_CAPS_SUPPORT_BW_MAX))) 536 bad = tb[NET_SHAPER_A_BW_MAX]; 537 if (tb[NET_SHAPER_A_BURST] && 538 !(caps & BIT(NET_SHAPER_A_CAPS_SUPPORT_BURST))) 539 bad = tb[NET_SHAPER_A_BURST]; 540 541 if (!caps) 542 bad = tb[NET_SHAPER_A_HANDLE]; 543 544 if (bad) { 545 NL_SET_BAD_ATTR(info->extack, bad); 546 return -EOPNOTSUPP; 547 } 548 549 if (shaper->handle.scope == NET_SHAPER_SCOPE_QUEUE && 550 binding->type == NET_SHAPER_BINDING_TYPE_NETDEV && 551 shaper->handle.id >= binding->netdev->real_num_tx_queues) { 552 NL_SET_ERR_MSG_FMT(info->extack, 553 "Not existing queue id %d max %d", 554 shaper->handle.id, 555 binding->netdev->real_num_tx_queues); 556 return -ENOENT; 557 } 558 559 /* The metric is really used only if there is *any* rate-related 560 * setting, either in current attributes set or in pre-existing 561 * values. 562 */ 563 if (shaper->burst || shaper->bw_min || shaper->bw_max) { 564 u32 metric_cap = NET_SHAPER_A_CAPS_SUPPORT_METRIC_BPS + 565 shaper->metric; 566 567 /* The metric test can fail even when the user did not 568 * specify the METRIC attribute. Pointing to rate related 569 * attribute will be confusing, as the attribute itself 570 * could be indeed supported, with a different metric. 571 * Be more specific. 572 */ 573 if (!(caps & BIT(metric_cap))) { 574 NL_SET_ERR_MSG_FMT(info->extack, "Bad metric %d", 575 shaper->metric); 576 return -EOPNOTSUPP; 577 } 578 } 579 return 0; 580 } 581 582 static int net_shaper_parse_info(struct net_shaper_binding *binding, 583 struct nlattr **tb, 584 const struct genl_info *info, 585 struct net_shaper *shaper, 586 bool *exists) 587 { 588 struct net_shaper *old; 589 int ret; 590 591 /* The shaper handle is the only mandatory attribute. */ 592 if (NL_REQ_ATTR_CHECK(info->extack, NULL, tb, NET_SHAPER_A_HANDLE)) 593 return -EINVAL; 594 595 ret = net_shaper_parse_handle(tb[NET_SHAPER_A_HANDLE], info, 596 &shaper->handle); 597 if (ret) 598 return ret; 599 600 if (shaper->handle.scope == NET_SHAPER_SCOPE_UNSPEC) { 601 NL_SET_BAD_ATTR(info->extack, tb[NET_SHAPER_A_HANDLE]); 602 return -EINVAL; 603 } 604 605 /* Fetch existing hierarchy, if any, so that user provide info will 606 * incrementally update the existing shaper configuration. 607 */ 608 old = net_shaper_lookup(binding, &shaper->handle); 609 if (old) 610 *shaper = *old; 611 *exists = !!old; 612 613 if (tb[NET_SHAPER_A_METRIC]) 614 shaper->metric = nla_get_u32(tb[NET_SHAPER_A_METRIC]); 615 616 if (tb[NET_SHAPER_A_BW_MIN]) 617 shaper->bw_min = nla_get_uint(tb[NET_SHAPER_A_BW_MIN]); 618 619 if (tb[NET_SHAPER_A_BW_MAX]) 620 shaper->bw_max = nla_get_uint(tb[NET_SHAPER_A_BW_MAX]); 621 622 if (tb[NET_SHAPER_A_BURST]) 623 shaper->burst = nla_get_uint(tb[NET_SHAPER_A_BURST]); 624 625 if (tb[NET_SHAPER_A_PRIORITY]) 626 shaper->priority = nla_get_u32(tb[NET_SHAPER_A_PRIORITY]); 627 628 if (tb[NET_SHAPER_A_WEIGHT]) 629 shaper->weight = nla_get_u32(tb[NET_SHAPER_A_WEIGHT]); 630 631 ret = net_shaper_validate_caps(binding, tb, info, shaper); 632 if (ret < 0) 633 return ret; 634 635 return 0; 636 } 637 638 static int net_shaper_validate_nesting(struct net_shaper_binding *binding, 639 const struct net_shaper *shaper, 640 struct netlink_ext_ack *extack) 641 { 642 const struct net_shaper_ops *ops = net_shaper_ops(binding); 643 unsigned long caps = 0; 644 645 ops->capabilities(binding, shaper->handle.scope, &caps); 646 if (!(caps & BIT(NET_SHAPER_A_CAPS_SUPPORT_NESTING))) { 647 NL_SET_ERR_MSG_FMT(extack, 648 "Nesting not supported for scope %d", 649 shaper->handle.scope); 650 return -EOPNOTSUPP; 651 } 652 return 0; 653 } 654 655 /* Fetch the existing leaf and update it with the user-provided 656 * attributes. 657 */ 658 static int net_shaper_parse_leaf(struct net_shaper_binding *binding, 659 const struct nlattr *attr, 660 const struct genl_info *info, 661 const struct net_shaper *node, 662 struct net_shaper *shaper) 663 { 664 struct nlattr *tb[NET_SHAPER_A_WEIGHT + 1]; 665 bool exists; 666 int ret; 667 668 ret = nla_parse_nested(tb, NET_SHAPER_A_WEIGHT, attr, 669 net_shaper_leaf_info_nl_policy, info->extack); 670 if (ret < 0) 671 return ret; 672 673 ret = net_shaper_parse_info(binding, tb, info, shaper, &exists); 674 if (ret < 0) 675 return ret; 676 677 if (shaper->handle.scope != NET_SHAPER_SCOPE_QUEUE) { 678 NL_SET_BAD_ATTR(info->extack, tb[NET_SHAPER_A_HANDLE]); 679 return -EINVAL; 680 } 681 682 if (node->handle.scope == NET_SHAPER_SCOPE_NODE) { 683 ret = net_shaper_validate_nesting(binding, shaper, 684 info->extack); 685 if (ret < 0) 686 return ret; 687 } 688 689 if (!exists) 690 net_shaper_default_parent(&shaper->handle, &shaper->parent); 691 return 0; 692 } 693 694 /* Alike net_parse_shaper_info(), but additionally allow the user specifying 695 * the shaper's parent handle. 696 */ 697 static int net_shaper_parse_node(struct net_shaper_binding *binding, 698 struct nlattr **tb, 699 const struct genl_info *info, 700 struct net_shaper *shaper) 701 { 702 bool exists; 703 int ret; 704 705 ret = net_shaper_parse_info(binding, tb, info, shaper, &exists); 706 if (ret) 707 return ret; 708 709 if (shaper->handle.scope != NET_SHAPER_SCOPE_NODE && 710 shaper->handle.scope != NET_SHAPER_SCOPE_NETDEV) { 711 NL_SET_BAD_ATTR(info->extack, tb[NET_SHAPER_A_HANDLE]); 712 return -EINVAL; 713 } 714 715 if (tb[NET_SHAPER_A_PARENT]) { 716 ret = net_shaper_parse_handle(tb[NET_SHAPER_A_PARENT], info, 717 &shaper->parent); 718 if (ret) 719 return ret; 720 721 if (shaper->parent.scope != NET_SHAPER_SCOPE_NODE && 722 shaper->parent.scope != NET_SHAPER_SCOPE_NETDEV) { 723 NL_SET_BAD_ATTR(info->extack, tb[NET_SHAPER_A_PARENT]); 724 return -EINVAL; 725 } 726 } 727 return 0; 728 } 729 730 static int net_shaper_generic_pre(struct genl_info *info, int type) 731 { 732 struct net_shaper_nl_ctx *ctx = (struct net_shaper_nl_ctx *)info->ctx; 733 734 BUILD_BUG_ON(sizeof(*ctx) > sizeof(info->ctx)); 735 736 return net_shaper_ctx_setup(info, type, ctx); 737 } 738 739 int net_shaper_nl_pre_doit(const struct genl_split_ops *ops, 740 struct sk_buff *skb, struct genl_info *info) 741 { 742 return net_shaper_generic_pre(info, NET_SHAPER_A_IFINDEX); 743 } 744 745 static void net_shaper_generic_post(struct genl_info *info) 746 { 747 net_shaper_ctx_cleanup((struct net_shaper_nl_ctx *)info->ctx); 748 } 749 750 void net_shaper_nl_post_doit(const struct genl_split_ops *ops, 751 struct sk_buff *skb, struct genl_info *info) 752 { 753 net_shaper_generic_post(info); 754 } 755 756 int net_shaper_nl_pre_doit_write(const struct genl_split_ops *ops, 757 struct sk_buff *skb, struct genl_info *info) 758 { 759 struct net_shaper_nl_ctx *ctx = (struct net_shaper_nl_ctx *)info->ctx; 760 761 BUILD_BUG_ON(sizeof(*ctx) > sizeof(info->ctx)); 762 763 return net_shaper_ctx_setup_lock(info, NET_SHAPER_A_IFINDEX, ctx); 764 } 765 766 void net_shaper_nl_post_doit_write(const struct genl_split_ops *ops, 767 struct sk_buff *skb, struct genl_info *info) 768 { 769 net_shaper_ctx_cleanup_unlock((struct net_shaper_nl_ctx *)info->ctx); 770 } 771 772 int net_shaper_nl_pre_dumpit(struct netlink_callback *cb) 773 { 774 struct net_shaper_nl_ctx *ctx = (struct net_shaper_nl_ctx *)cb->ctx; 775 const struct genl_info *info = genl_info_dump(cb); 776 777 return net_shaper_ctx_setup(info, NET_SHAPER_A_IFINDEX, ctx); 778 } 779 780 int net_shaper_nl_post_dumpit(struct netlink_callback *cb) 781 { 782 net_shaper_ctx_cleanup((struct net_shaper_nl_ctx *)cb->ctx); 783 return 0; 784 } 785 786 int net_shaper_nl_cap_pre_doit(const struct genl_split_ops *ops, 787 struct sk_buff *skb, struct genl_info *info) 788 { 789 return net_shaper_generic_pre(info, NET_SHAPER_A_CAPS_IFINDEX); 790 } 791 792 void net_shaper_nl_cap_post_doit(const struct genl_split_ops *ops, 793 struct sk_buff *skb, struct genl_info *info) 794 { 795 net_shaper_generic_post(info); 796 } 797 798 int net_shaper_nl_cap_pre_dumpit(struct netlink_callback *cb) 799 { 800 struct net_shaper_nl_ctx *ctx = (struct net_shaper_nl_ctx *)cb->ctx; 801 802 return net_shaper_ctx_setup(genl_info_dump(cb), 803 NET_SHAPER_A_CAPS_IFINDEX, ctx); 804 } 805 806 int net_shaper_nl_cap_post_dumpit(struct netlink_callback *cb) 807 { 808 struct net_shaper_nl_ctx *ctx = (struct net_shaper_nl_ctx *)cb->ctx; 809 810 net_shaper_ctx_cleanup(ctx); 811 return 0; 812 } 813 814 int net_shaper_nl_get_doit(struct sk_buff *skb, struct genl_info *info) 815 { 816 struct net_shaper_binding *binding; 817 struct net_shaper_handle handle; 818 struct net_shaper *shaper; 819 struct sk_buff *msg; 820 int ret; 821 822 if (GENL_REQ_ATTR_CHECK(info, NET_SHAPER_A_HANDLE)) 823 return -EINVAL; 824 825 binding = net_shaper_binding_from_ctx(info->ctx); 826 ret = net_shaper_parse_handle(info->attrs[NET_SHAPER_A_HANDLE], info, 827 &handle); 828 if (ret < 0) 829 return ret; 830 831 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 832 if (!msg) 833 return -ENOMEM; 834 835 rcu_read_lock(); 836 shaper = net_shaper_lookup(binding, &handle); 837 if (!shaper) { 838 NL_SET_BAD_ATTR(info->extack, 839 info->attrs[NET_SHAPER_A_HANDLE]); 840 rcu_read_unlock(); 841 ret = -ENOENT; 842 goto free_msg; 843 } 844 845 ret = net_shaper_fill_one(msg, binding, shaper, info); 846 rcu_read_unlock(); 847 if (ret) 848 goto free_msg; 849 850 return genlmsg_reply(msg, info); 851 852 free_msg: 853 nlmsg_free(msg); 854 return ret; 855 } 856 857 int net_shaper_nl_get_dumpit(struct sk_buff *skb, 858 struct netlink_callback *cb) 859 { 860 struct net_shaper_nl_ctx *ctx = (struct net_shaper_nl_ctx *)cb->ctx; 861 const struct genl_info *info = genl_info_dump(cb); 862 struct net_shaper_hierarchy *hierarchy; 863 struct net_shaper_binding *binding; 864 struct net_shaper *shaper; 865 int ret = 0; 866 867 /* Don't error out dumps performed before any set operation. */ 868 binding = net_shaper_binding_from_ctx(ctx); 869 870 rcu_read_lock(); 871 hierarchy = net_shaper_hierarchy_rcu(binding); 872 if (!hierarchy) 873 goto out_unlock; 874 875 for (; (shaper = xa_find(&hierarchy->shapers, &ctx->start_index, 876 U32_MAX, XA_PRESENT)); 877 ctx->start_index++) { 878 /* Check valid before reading fields */ 879 if (!smp_load_acquire(&shaper->valid)) 880 continue; 881 882 ret = net_shaper_fill_one(skb, binding, shaper, info); 883 if (ret) 884 break; 885 } 886 out_unlock: 887 rcu_read_unlock(); 888 889 return ret; 890 } 891 892 int net_shaper_nl_set_doit(struct sk_buff *skb, struct genl_info *info) 893 { 894 struct net_shaper_hierarchy *hierarchy; 895 struct net_shaper_binding *binding; 896 const struct net_shaper_ops *ops; 897 struct net_shaper_handle handle; 898 struct net_shaper shaper = {}; 899 bool exists; 900 int ret; 901 902 binding = net_shaper_binding_from_ctx(info->ctx); 903 904 ret = net_shaper_parse_info(binding, info->attrs, info, &shaper, 905 &exists); 906 if (ret) 907 return ret; 908 909 if (!exists) 910 net_shaper_default_parent(&shaper.handle, &shaper.parent); 911 912 hierarchy = net_shaper_hierarchy_setup(binding); 913 if (!hierarchy) 914 return -ENOMEM; 915 916 /* The 'set' operation can't create node-scope shapers. */ 917 handle = shaper.handle; 918 if (handle.scope == NET_SHAPER_SCOPE_NODE && 919 !net_shaper_lookup(binding, &handle)) 920 return -ENOENT; 921 922 ret = net_shaper_pre_insert(binding, &handle, info->extack); 923 if (ret) 924 return ret; 925 926 ops = net_shaper_ops(binding); 927 ret = ops->set(binding, &shaper, info->extack); 928 if (ret) { 929 net_shaper_rollback(binding); 930 return ret; 931 } 932 933 net_shaper_commit(binding, 1, &shaper); 934 935 return 0; 936 } 937 938 static int __net_shaper_delete(struct net_shaper_binding *binding, 939 struct net_shaper *shaper, 940 struct netlink_ext_ack *extack) 941 { 942 struct net_shaper_hierarchy *hierarchy = net_shaper_hierarchy(binding); 943 struct net_shaper_handle parent_handle, handle = shaper->handle; 944 const struct net_shaper_ops *ops = net_shaper_ops(binding); 945 int ret; 946 947 again: 948 parent_handle = shaper->parent; 949 950 ret = ops->delete(binding, &handle, extack); 951 if (ret < 0) 952 return ret; 953 954 xa_erase(&hierarchy->shapers, net_shaper_handle_to_index(&handle)); 955 kfree_rcu(shaper, rcu); 956 957 /* Eventually delete the parent, if it is left over with no leaves. */ 958 if (parent_handle.scope == NET_SHAPER_SCOPE_NODE) { 959 shaper = net_shaper_lookup(binding, &parent_handle); 960 if (shaper && !--shaper->leaves) { 961 handle = parent_handle; 962 goto again; 963 } 964 } 965 return 0; 966 } 967 968 static int net_shaper_handle_cmp(const struct net_shaper_handle *a, 969 const struct net_shaper_handle *b) 970 { 971 /* Must avoid holes in struct net_shaper_handle. */ 972 BUILD_BUG_ON(sizeof(*a) != 8); 973 974 return memcmp(a, b, sizeof(*a)); 975 } 976 977 static int net_shaper_parse_leaves(struct net_shaper_binding *binding, 978 struct genl_info *info, 979 const struct net_shaper *node, 980 struct net_shaper *leaves, 981 int leaves_count) 982 { 983 struct nlattr *attr; 984 int i, j, ret, rem; 985 986 i = 0; 987 nla_for_each_attr_type(attr, NET_SHAPER_A_LEAVES, 988 genlmsg_data(info->genlhdr), 989 genlmsg_len(info->genlhdr), rem) { 990 if (WARN_ON_ONCE(i >= leaves_count)) 991 return -EINVAL; 992 993 ret = net_shaper_parse_leaf(binding, attr, info, 994 node, &leaves[i]); 995 if (ret) 996 return ret; 997 998 /* Reject duplicates */ 999 for (j = 0; j < i; j++) { 1000 if (net_shaper_handle_cmp(&leaves[i].handle, 1001 &leaves[j].handle)) 1002 continue; 1003 1004 NL_SET_ERR_MSG_ATTR_FMT(info->extack, attr, 1005 "Duplicate leaf shaper %d:%d", 1006 leaves[i].handle.scope, 1007 leaves[i].handle.id); 1008 return -EINVAL; 1009 } 1010 1011 i++; 1012 } 1013 1014 return 0; 1015 } 1016 1017 static int net_shaper_parent_from_leaves(int leaves_count, 1018 const struct net_shaper *leaves, 1019 struct net_shaper *node, 1020 struct netlink_ext_ack *extack) 1021 { 1022 struct net_shaper_handle parent = leaves[0].parent; 1023 int i; 1024 1025 for (i = 1; i < leaves_count; ++i) { 1026 if (net_shaper_handle_cmp(&leaves[i].parent, &parent)) { 1027 NL_SET_ERR_MSG_FMT(extack, "All the leaves shapers must have the same old parent"); 1028 return -EINVAL; 1029 } 1030 } 1031 1032 node->parent = parent; 1033 return 0; 1034 } 1035 1036 static int __net_shaper_group(struct net_shaper_binding *binding, 1037 bool update_node, int leaves_count, 1038 struct net_shaper *leaves, 1039 struct net_shaper *node, 1040 struct netlink_ext_ack *extack) 1041 { 1042 const struct net_shaper_ops *ops = net_shaper_ops(binding); 1043 struct net_shaper_handle leaf_handle; 1044 struct net_shaper *parent = NULL; 1045 bool new_node = false; 1046 int i, ret; 1047 1048 if (node->handle.scope == NET_SHAPER_SCOPE_NODE) { 1049 struct net_shaper *cur = NULL; 1050 1051 new_node = node->handle.id == NET_SHAPER_ID_UNSPEC; 1052 1053 if (!new_node) { 1054 cur = net_shaper_lookup(binding, &node->handle); 1055 if (!cur) { 1056 /* The related attribute is not available 1057 * when reaching here from the delete() op. 1058 */ 1059 NL_SET_ERR_MSG_FMT(extack, 1060 "Node shaper %d:%d does not exist", 1061 node->handle.scope, 1062 node->handle.id); 1063 return -ENOENT; 1064 } 1065 } 1066 1067 /* When unspecified, the node parent scope is inherited from 1068 * the leaves. 1069 */ 1070 if (node->parent.scope == NET_SHAPER_SCOPE_UNSPEC) { 1071 ret = net_shaper_parent_from_leaves(leaves_count, 1072 leaves, node, 1073 extack); 1074 if (ret) 1075 return ret; 1076 } 1077 1078 if (cur && net_shaper_handle_cmp(&cur->parent, 1079 &node->parent)) { 1080 NL_SET_ERR_MSG_FMT(extack, 1081 "Cannot reparent node shaper %d:%d", 1082 node->handle.scope, 1083 node->handle.id); 1084 return -EOPNOTSUPP; 1085 } 1086 1087 } else { 1088 net_shaper_default_parent(&node->handle, &node->parent); 1089 } 1090 1091 if (node->parent.scope == NET_SHAPER_SCOPE_NODE) { 1092 parent = net_shaper_lookup(binding, &node->parent); 1093 if (!parent) { 1094 NL_SET_ERR_MSG_FMT(extack, "Node parent shaper %d:%d does not exists", 1095 node->parent.scope, node->parent.id); 1096 return -ENOENT; 1097 } 1098 1099 ret = net_shaper_validate_nesting(binding, node, extack); 1100 if (ret < 0) 1101 return ret; 1102 } 1103 1104 if (update_node) { 1105 /* For newly created node scope shaper, the following will 1106 * update the handle, due to id allocation. 1107 */ 1108 ret = net_shaper_pre_insert(binding, &node->handle, extack); 1109 if (ret) 1110 return ret; 1111 } 1112 1113 for (i = 0; i < leaves_count; ++i) { 1114 leaf_handle = leaves[i].handle; 1115 1116 ret = net_shaper_pre_insert(binding, &leaf_handle, extack); 1117 if (ret) 1118 goto rollback; 1119 1120 if (!net_shaper_handle_cmp(&leaves[i].parent, &node->handle)) 1121 continue; 1122 1123 /* The leaves shapers will be nested to the node, update the 1124 * linking accordingly. 1125 */ 1126 leaves[i].parent = node->handle; 1127 node->leaves++; 1128 } 1129 1130 ret = ops->group(binding, leaves_count, leaves, node, extack); 1131 if (ret < 0) 1132 goto rollback; 1133 1134 /* The node's parent gains a new leaf only when the node itself 1135 * is created by this group operation 1136 */ 1137 if (new_node && parent) 1138 parent->leaves++; 1139 if (update_node) 1140 net_shaper_commit(binding, 1, node); 1141 net_shaper_commit(binding, leaves_count, leaves); 1142 return 0; 1143 1144 rollback: 1145 net_shaper_rollback(binding); 1146 return ret; 1147 } 1148 1149 static int net_shaper_pre_del_node(struct net_shaper_binding *binding, 1150 const struct net_shaper *shaper, 1151 struct netlink_ext_ack *extack) 1152 { 1153 struct net_shaper_hierarchy *hierarchy = net_shaper_hierarchy(binding); 1154 struct net_shaper *cur, *leaves, node = {}; 1155 int ret, leaves_count = 0; 1156 unsigned long index; 1157 bool update_node; 1158 1159 if (!shaper->leaves) 1160 return 0; 1161 1162 /* Fetch the new node information. */ 1163 node.handle = shaper->parent; 1164 cur = net_shaper_lookup(binding, &node.handle); 1165 if (cur) { 1166 node = *cur; 1167 } else { 1168 /* A scope NODE shaper can be nested only to the NETDEV scope 1169 * shaper without creating the latter, this check may fail only 1170 * if the data is in inconsistent status. 1171 */ 1172 if (WARN_ON_ONCE(node.handle.scope != NET_SHAPER_SCOPE_NETDEV)) 1173 return -EINVAL; 1174 } 1175 1176 leaves = kzalloc_objs(struct net_shaper, shaper->leaves); 1177 if (!leaves) 1178 return -ENOMEM; 1179 1180 /* Build the leaves arrays. */ 1181 xa_for_each(&hierarchy->shapers, index, cur) { 1182 if (net_shaper_handle_cmp(&cur->parent, &shaper->handle)) 1183 continue; 1184 1185 if (WARN_ON_ONCE(leaves_count == shaper->leaves)) { 1186 ret = -EINVAL; 1187 goto free; 1188 } 1189 1190 leaves[leaves_count++] = *cur; 1191 } 1192 1193 /* When re-linking to the netdev shaper, avoid the eventual, implicit, 1194 * creation of the new node, would be surprising since the user is 1195 * doing a delete operation. 1196 */ 1197 update_node = node.handle.scope != NET_SHAPER_SCOPE_NETDEV; 1198 ret = __net_shaper_group(binding, update_node, leaves_count, 1199 leaves, &node, extack); 1200 1201 free: 1202 kfree(leaves); 1203 return ret; 1204 } 1205 1206 int net_shaper_nl_delete_doit(struct sk_buff *skb, struct genl_info *info) 1207 { 1208 struct net_shaper_hierarchy *hierarchy; 1209 struct net_shaper_binding *binding; 1210 struct net_shaper_handle handle; 1211 struct net_shaper *shaper; 1212 int ret; 1213 1214 if (GENL_REQ_ATTR_CHECK(info, NET_SHAPER_A_HANDLE)) 1215 return -EINVAL; 1216 1217 binding = net_shaper_binding_from_ctx(info->ctx); 1218 1219 ret = net_shaper_parse_handle(info->attrs[NET_SHAPER_A_HANDLE], info, 1220 &handle); 1221 if (ret) 1222 return ret; 1223 1224 hierarchy = net_shaper_hierarchy(binding); 1225 if (!hierarchy) 1226 return -ENOENT; 1227 1228 shaper = net_shaper_lookup(binding, &handle); 1229 if (!shaper) 1230 return -ENOENT; 1231 1232 if (handle.scope == NET_SHAPER_SCOPE_NODE) { 1233 ret = net_shaper_pre_del_node(binding, shaper, info->extack); 1234 if (ret) 1235 return ret; 1236 } 1237 1238 return __net_shaper_delete(binding, shaper, info->extack); 1239 } 1240 1241 static int net_shaper_group_send_reply(struct net_shaper_binding *binding, 1242 const struct net_shaper_handle *handle, 1243 struct genl_info *info, 1244 struct sk_buff *msg) 1245 { 1246 void *hdr; 1247 1248 hdr = genlmsg_iput(msg, info); 1249 if (!hdr) 1250 goto free_msg; 1251 1252 if (net_shaper_fill_binding(msg, binding, NET_SHAPER_A_IFINDEX) || 1253 net_shaper_fill_handle(msg, handle, NET_SHAPER_A_HANDLE)) 1254 goto free_msg; 1255 1256 genlmsg_end(msg, hdr); 1257 1258 return genlmsg_reply(msg, info); 1259 1260 free_msg: 1261 /* Should never happen as msg is pre-allocated with enough space. */ 1262 WARN_ONCE(true, "calculated message payload length (%d)", 1263 net_shaper_group_reply_size()); 1264 nlmsg_free(msg); 1265 return -EMSGSIZE; 1266 } 1267 1268 int net_shaper_nl_group_doit(struct sk_buff *skb, struct genl_info *info) 1269 { 1270 struct net_shaper **old_nodes, *leaves, node = {}; 1271 struct net_shaper_hierarchy *hierarchy; 1272 struct net_shaper_binding *binding; 1273 int i, ret, leaves_count; 1274 int old_nodes_count = 0; 1275 struct sk_buff *msg; 1276 1277 if (GENL_REQ_ATTR_CHECK(info, NET_SHAPER_A_LEAVES)) 1278 return -EINVAL; 1279 1280 binding = net_shaper_binding_from_ctx(info->ctx); 1281 1282 /* The group operation is optional. */ 1283 if (!net_shaper_ops(binding)->group) 1284 return -EOPNOTSUPP; 1285 1286 leaves_count = net_shaper_list_len(info, NET_SHAPER_A_LEAVES); 1287 if (!leaves_count) { 1288 NL_SET_BAD_ATTR(info->extack, 1289 info->attrs[NET_SHAPER_A_LEAVES]); 1290 return -EINVAL; 1291 } 1292 1293 leaves = kcalloc(leaves_count, sizeof(struct net_shaper) + 1294 sizeof(struct net_shaper *), GFP_KERNEL); 1295 if (!leaves) 1296 return -ENOMEM; 1297 old_nodes = (void *)&leaves[leaves_count]; 1298 1299 ret = net_shaper_parse_node(binding, info->attrs, info, &node); 1300 if (ret) 1301 goto free_leaves; 1302 1303 ret = net_shaper_parse_leaves(binding, info, &node, 1304 leaves, leaves_count); 1305 if (ret) 1306 goto free_leaves; 1307 1308 /* Prepare the msg reply in advance, to avoid device operation 1309 * rollback on allocation failure. 1310 */ 1311 msg = genlmsg_new(net_shaper_group_reply_size(), GFP_KERNEL); 1312 if (!msg) { 1313 ret = -ENOMEM; 1314 goto free_leaves; 1315 } 1316 1317 hierarchy = net_shaper_hierarchy_setup(binding); 1318 if (!hierarchy) { 1319 ret = -ENOMEM; 1320 goto free_msg; 1321 } 1322 1323 /* Record the node shapers that this group() operation can make 1324 * childless for later cleanup. 1325 */ 1326 for (i = 0; i < leaves_count; i++) { 1327 if (leaves[i].parent.scope == NET_SHAPER_SCOPE_NODE && 1328 net_shaper_handle_cmp(&leaves[i].parent, &node.handle)) { 1329 struct net_shaper *tmp; 1330 1331 tmp = net_shaper_lookup(binding, &leaves[i].parent); 1332 if (!tmp) 1333 continue; 1334 1335 old_nodes[old_nodes_count++] = tmp; 1336 } 1337 } 1338 1339 ret = __net_shaper_group(binding, true, leaves_count, leaves, &node, 1340 info->extack); 1341 if (ret) 1342 goto free_msg; 1343 1344 /* Check if we need to delete any node left alone by the new leaves 1345 * linkage. 1346 */ 1347 for (i = 0; i < old_nodes_count; ++i) { 1348 struct net_shaper *tmp = old_nodes[i]; 1349 1350 if (--tmp->leaves > 0) 1351 continue; 1352 1353 /* Errors here are not fatal: the grouping operation is 1354 * completed, and user-space can still explicitly clean-up 1355 * left-over nodes. 1356 */ 1357 __net_shaper_delete(binding, tmp, info->extack); 1358 } 1359 1360 ret = net_shaper_group_send_reply(binding, &node.handle, info, msg); 1361 if (ret) 1362 GENL_SET_ERR_MSG_FMT(info, "Can't send reply"); 1363 1364 free_leaves: 1365 kfree(leaves); 1366 return ret; 1367 1368 free_msg: 1369 kfree_skb(msg); 1370 goto free_leaves; 1371 } 1372 1373 static int 1374 net_shaper_cap_fill_one(struct sk_buff *msg, 1375 struct net_shaper_binding *binding, 1376 enum net_shaper_scope scope, unsigned long flags, 1377 const struct genl_info *info) 1378 { 1379 unsigned long cur; 1380 void *hdr; 1381 1382 hdr = genlmsg_iput(msg, info); 1383 if (!hdr) 1384 return -EMSGSIZE; 1385 1386 if (net_shaper_fill_binding(msg, binding, NET_SHAPER_A_CAPS_IFINDEX) || 1387 nla_put_u32(msg, NET_SHAPER_A_CAPS_SCOPE, scope)) 1388 goto nla_put_failure; 1389 1390 for (cur = NET_SHAPER_A_CAPS_SUPPORT_METRIC_BPS; 1391 cur <= NET_SHAPER_A_CAPS_MAX; ++cur) { 1392 if (flags & BIT(cur) && nla_put_flag(msg, cur)) 1393 goto nla_put_failure; 1394 } 1395 1396 genlmsg_end(msg, hdr); 1397 1398 return 0; 1399 1400 nla_put_failure: 1401 genlmsg_cancel(msg, hdr); 1402 return -EMSGSIZE; 1403 } 1404 1405 int net_shaper_nl_cap_get_doit(struct sk_buff *skb, struct genl_info *info) 1406 { 1407 struct net_shaper_binding *binding; 1408 const struct net_shaper_ops *ops; 1409 enum net_shaper_scope scope; 1410 unsigned long flags = 0; 1411 struct sk_buff *msg; 1412 int ret; 1413 1414 if (GENL_REQ_ATTR_CHECK(info, NET_SHAPER_A_CAPS_SCOPE)) 1415 return -EINVAL; 1416 1417 binding = net_shaper_binding_from_ctx(info->ctx); 1418 scope = nla_get_u32(info->attrs[NET_SHAPER_A_CAPS_SCOPE]); 1419 ops = net_shaper_ops(binding); 1420 ops->capabilities(binding, scope, &flags); 1421 if (!flags) 1422 return -EOPNOTSUPP; 1423 1424 msg = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 1425 if (!msg) 1426 return -ENOMEM; 1427 1428 ret = net_shaper_cap_fill_one(msg, binding, scope, flags, info); 1429 if (ret) 1430 goto free_msg; 1431 1432 return genlmsg_reply(msg, info); 1433 1434 free_msg: 1435 nlmsg_free(msg); 1436 return ret; 1437 } 1438 1439 int net_shaper_nl_cap_get_dumpit(struct sk_buff *skb, 1440 struct netlink_callback *cb) 1441 { 1442 const struct genl_info *info = genl_info_dump(cb); 1443 struct net_shaper_binding *binding; 1444 const struct net_shaper_ops *ops; 1445 enum net_shaper_scope scope; 1446 int ret; 1447 1448 binding = net_shaper_binding_from_ctx(cb->ctx); 1449 ops = net_shaper_ops(binding); 1450 for (scope = 0; scope <= NET_SHAPER_SCOPE_MAX; ++scope) { 1451 unsigned long flags = 0; 1452 1453 ops->capabilities(binding, scope, &flags); 1454 if (!flags) 1455 continue; 1456 1457 ret = net_shaper_cap_fill_one(skb, binding, scope, flags, 1458 info); 1459 if (ret) 1460 return ret; 1461 } 1462 1463 return 0; 1464 } 1465 1466 static void net_shaper_flush(struct net_shaper_binding *binding) 1467 { 1468 struct net_shaper_hierarchy *hierarchy = net_shaper_hierarchy(binding); 1469 struct net_shaper *cur; 1470 unsigned long index; 1471 1472 if (!hierarchy) 1473 return; 1474 1475 xa_lock(&hierarchy->shapers); 1476 xa_for_each(&hierarchy->shapers, index, cur) { 1477 __xa_erase(&hierarchy->shapers, index); 1478 kfree(cur); 1479 } 1480 xa_unlock(&hierarchy->shapers); 1481 1482 kfree(hierarchy); 1483 } 1484 1485 void net_shaper_flush_netdev(struct net_device *dev) 1486 { 1487 struct net_shaper_binding binding = { 1488 .type = NET_SHAPER_BINDING_TYPE_NETDEV, 1489 .netdev = dev, 1490 }; 1491 1492 net_shaper_flush(&binding); 1493 } 1494 1495 void net_shaper_set_real_num_tx_queues(struct net_device *dev, 1496 unsigned int txq) 1497 { 1498 struct net_shaper_hierarchy *hierarchy; 1499 struct net_shaper_binding binding; 1500 int i; 1501 1502 binding.type = NET_SHAPER_BINDING_TYPE_NETDEV; 1503 binding.netdev = dev; 1504 hierarchy = net_shaper_hierarchy(&binding); 1505 if (!hierarchy) 1506 return; 1507 1508 /* Only drivers implementing shapers support ensure 1509 * the lock is acquired in advance. 1510 */ 1511 netdev_assert_locked(dev); 1512 1513 /* Take action only when decreasing the tx queue number. */ 1514 for (i = txq; i < dev->real_num_tx_queues; ++i) { 1515 struct net_shaper_handle handle, parent_handle; 1516 struct net_shaper *shaper; 1517 u32 index; 1518 1519 handle.scope = NET_SHAPER_SCOPE_QUEUE; 1520 handle.id = i; 1521 shaper = net_shaper_lookup(&binding, &handle); 1522 if (!shaper) 1523 continue; 1524 1525 /* Don't touch the H/W for the queue shaper, the drivers already 1526 * deleted the queue and related resources. 1527 */ 1528 parent_handle = shaper->parent; 1529 index = net_shaper_handle_to_index(&handle); 1530 xa_erase(&hierarchy->shapers, index); 1531 kfree_rcu(shaper, rcu); 1532 1533 /* The recursion on parent does the full job. */ 1534 if (parent_handle.scope != NET_SHAPER_SCOPE_NODE) 1535 continue; 1536 1537 shaper = net_shaper_lookup(&binding, &parent_handle); 1538 if (shaper && !--shaper->leaves) 1539 __net_shaper_delete(&binding, shaper, NULL); 1540 } 1541 } 1542 1543 static int __init shaper_init(void) 1544 { 1545 return genl_register_family(&net_shaper_nl_family); 1546 } 1547 1548 subsys_initcall(shaper_init); 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