1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #include <linux/kernel.h> 3 #include <linux/slab.h> 4 #include <net/act_api.h> 5 #include <net/flow_offload.h> 6 #include <linux/rtnetlink.h> 7 #include <linux/mutex.h> 8 #include <linux/rhashtable.h> 9 10 struct flow_rule *flow_rule_alloc(unsigned int num_actions) 11 { 12 struct flow_rule *rule; 13 int i; 14 15 rule = kzalloc(struct_size(rule, action.entries, num_actions), 16 GFP_KERNEL); 17 if (!rule) 18 return NULL; 19 20 rule->action.num_entries = num_actions; 21 /* Pre-fill each action hw_stats with DONT_CARE. 22 * Caller can override this if it wants stats for a given action. 23 */ 24 for (i = 0; i < num_actions; i++) 25 rule->action.entries[i].hw_stats = FLOW_ACTION_HW_STATS_DONT_CARE; 26 27 return rule; 28 } 29 EXPORT_SYMBOL(flow_rule_alloc); 30 31 struct flow_offload_action *offload_action_alloc(unsigned int num_actions) 32 { 33 struct flow_offload_action *fl_action; 34 int i; 35 36 fl_action = kzalloc(struct_size(fl_action, action.entries, num_actions), 37 GFP_KERNEL); 38 if (!fl_action) 39 return NULL; 40 41 fl_action->action.num_entries = num_actions; 42 /* Pre-fill each action hw_stats with DONT_CARE. 43 * Caller can override this if it wants stats for a given action. 44 */ 45 for (i = 0; i < num_actions; i++) 46 fl_action->action.entries[i].hw_stats = FLOW_ACTION_HW_STATS_DONT_CARE; 47 48 return fl_action; 49 } 50 51 #define FLOW_DISSECTOR_MATCH(__rule, __type, __out) \ 52 const struct flow_match *__m = &(__rule)->match; \ 53 struct flow_dissector *__d = (__m)->dissector; \ 54 \ 55 (__out)->key = skb_flow_dissector_target(__d, __type, (__m)->key); \ 56 (__out)->mask = skb_flow_dissector_target(__d, __type, (__m)->mask); \ 57 58 void flow_rule_match_meta(const struct flow_rule *rule, 59 struct flow_match_meta *out) 60 { 61 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_META, out); 62 } 63 EXPORT_SYMBOL(flow_rule_match_meta); 64 65 void flow_rule_match_basic(const struct flow_rule *rule, 66 struct flow_match_basic *out) 67 { 68 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_BASIC, out); 69 } 70 EXPORT_SYMBOL(flow_rule_match_basic); 71 72 void flow_rule_match_control(const struct flow_rule *rule, 73 struct flow_match_control *out) 74 { 75 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_CONTROL, out); 76 } 77 EXPORT_SYMBOL(flow_rule_match_control); 78 79 void flow_rule_match_eth_addrs(const struct flow_rule *rule, 80 struct flow_match_eth_addrs *out) 81 { 82 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS, out); 83 } 84 EXPORT_SYMBOL(flow_rule_match_eth_addrs); 85 86 void flow_rule_match_vlan(const struct flow_rule *rule, 87 struct flow_match_vlan *out) 88 { 89 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_VLAN, out); 90 } 91 EXPORT_SYMBOL(flow_rule_match_vlan); 92 93 void flow_rule_match_cvlan(const struct flow_rule *rule, 94 struct flow_match_vlan *out) 95 { 96 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_CVLAN, out); 97 } 98 EXPORT_SYMBOL(flow_rule_match_cvlan); 99 100 void flow_rule_match_ipv4_addrs(const struct flow_rule *rule, 101 struct flow_match_ipv4_addrs *out) 102 { 103 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_IPV4_ADDRS, out); 104 } 105 EXPORT_SYMBOL(flow_rule_match_ipv4_addrs); 106 107 void flow_rule_match_ipv6_addrs(const struct flow_rule *rule, 108 struct flow_match_ipv6_addrs *out) 109 { 110 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_IPV6_ADDRS, out); 111 } 112 EXPORT_SYMBOL(flow_rule_match_ipv6_addrs); 113 114 void flow_rule_match_ip(const struct flow_rule *rule, 115 struct flow_match_ip *out) 116 { 117 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_IP, out); 118 } 119 EXPORT_SYMBOL(flow_rule_match_ip); 120 121 void flow_rule_match_ports(const struct flow_rule *rule, 122 struct flow_match_ports *out) 123 { 124 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_PORTS, out); 125 } 126 EXPORT_SYMBOL(flow_rule_match_ports); 127 128 void flow_rule_match_ports_range(const struct flow_rule *rule, 129 struct flow_match_ports_range *out) 130 { 131 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_PORTS_RANGE, out); 132 } 133 EXPORT_SYMBOL(flow_rule_match_ports_range); 134 135 void flow_rule_match_tcp(const struct flow_rule *rule, 136 struct flow_match_tcp *out) 137 { 138 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_TCP, out); 139 } 140 EXPORT_SYMBOL(flow_rule_match_tcp); 141 142 void flow_rule_match_icmp(const struct flow_rule *rule, 143 struct flow_match_icmp *out) 144 { 145 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ICMP, out); 146 } 147 EXPORT_SYMBOL(flow_rule_match_icmp); 148 149 void flow_rule_match_mpls(const struct flow_rule *rule, 150 struct flow_match_mpls *out) 151 { 152 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_MPLS, out); 153 } 154 EXPORT_SYMBOL(flow_rule_match_mpls); 155 156 void flow_rule_match_enc_control(const struct flow_rule *rule, 157 struct flow_match_control *out) 158 { 159 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_CONTROL, out); 160 } 161 EXPORT_SYMBOL(flow_rule_match_enc_control); 162 163 void flow_rule_match_enc_ipv4_addrs(const struct flow_rule *rule, 164 struct flow_match_ipv4_addrs *out) 165 { 166 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS, out); 167 } 168 EXPORT_SYMBOL(flow_rule_match_enc_ipv4_addrs); 169 170 void flow_rule_match_enc_ipv6_addrs(const struct flow_rule *rule, 171 struct flow_match_ipv6_addrs *out) 172 { 173 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS, out); 174 } 175 EXPORT_SYMBOL(flow_rule_match_enc_ipv6_addrs); 176 177 void flow_rule_match_enc_ip(const struct flow_rule *rule, 178 struct flow_match_ip *out) 179 { 180 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_IP, out); 181 } 182 EXPORT_SYMBOL(flow_rule_match_enc_ip); 183 184 void flow_rule_match_enc_ports(const struct flow_rule *rule, 185 struct flow_match_ports *out) 186 { 187 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_PORTS, out); 188 } 189 EXPORT_SYMBOL(flow_rule_match_enc_ports); 190 191 void flow_rule_match_enc_keyid(const struct flow_rule *rule, 192 struct flow_match_enc_keyid *out) 193 { 194 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_KEYID, out); 195 } 196 EXPORT_SYMBOL(flow_rule_match_enc_keyid); 197 198 void flow_rule_match_enc_opts(const struct flow_rule *rule, 199 struct flow_match_enc_opts *out) 200 { 201 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_OPTS, out); 202 } 203 EXPORT_SYMBOL(flow_rule_match_enc_opts); 204 205 struct flow_action_cookie *flow_action_cookie_create(void *data, 206 unsigned int len, 207 gfp_t gfp) 208 { 209 struct flow_action_cookie *cookie; 210 211 cookie = kmalloc(sizeof(*cookie) + len, gfp); 212 if (!cookie) 213 return NULL; 214 cookie->cookie_len = len; 215 memcpy(cookie->cookie, data, len); 216 return cookie; 217 } 218 EXPORT_SYMBOL(flow_action_cookie_create); 219 220 void flow_action_cookie_destroy(struct flow_action_cookie *cookie) 221 { 222 kfree(cookie); 223 } 224 EXPORT_SYMBOL(flow_action_cookie_destroy); 225 226 void flow_rule_match_ct(const struct flow_rule *rule, 227 struct flow_match_ct *out) 228 { 229 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_CT, out); 230 } 231 EXPORT_SYMBOL(flow_rule_match_ct); 232 233 void flow_rule_match_pppoe(const struct flow_rule *rule, 234 struct flow_match_pppoe *out) 235 { 236 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_PPPOE, out); 237 } 238 EXPORT_SYMBOL(flow_rule_match_pppoe); 239 240 struct flow_block_cb *flow_block_cb_alloc(flow_setup_cb_t *cb, 241 void *cb_ident, void *cb_priv, 242 void (*release)(void *cb_priv)) 243 { 244 struct flow_block_cb *block_cb; 245 246 block_cb = kzalloc(sizeof(*block_cb), GFP_KERNEL); 247 if (!block_cb) 248 return ERR_PTR(-ENOMEM); 249 250 block_cb->cb = cb; 251 block_cb->cb_ident = cb_ident; 252 block_cb->cb_priv = cb_priv; 253 block_cb->release = release; 254 255 return block_cb; 256 } 257 EXPORT_SYMBOL(flow_block_cb_alloc); 258 259 void flow_block_cb_free(struct flow_block_cb *block_cb) 260 { 261 if (block_cb->release) 262 block_cb->release(block_cb->cb_priv); 263 264 kfree(block_cb); 265 } 266 EXPORT_SYMBOL(flow_block_cb_free); 267 268 struct flow_block_cb *flow_block_cb_lookup(struct flow_block *block, 269 flow_setup_cb_t *cb, void *cb_ident) 270 { 271 struct flow_block_cb *block_cb; 272 273 list_for_each_entry(block_cb, &block->cb_list, list) { 274 if (block_cb->cb == cb && 275 block_cb->cb_ident == cb_ident) 276 return block_cb; 277 } 278 279 return NULL; 280 } 281 EXPORT_SYMBOL(flow_block_cb_lookup); 282 283 void *flow_block_cb_priv(struct flow_block_cb *block_cb) 284 { 285 return block_cb->cb_priv; 286 } 287 EXPORT_SYMBOL(flow_block_cb_priv); 288 289 void flow_block_cb_incref(struct flow_block_cb *block_cb) 290 { 291 block_cb->refcnt++; 292 } 293 EXPORT_SYMBOL(flow_block_cb_incref); 294 295 unsigned int flow_block_cb_decref(struct flow_block_cb *block_cb) 296 { 297 return --block_cb->refcnt; 298 } 299 EXPORT_SYMBOL(flow_block_cb_decref); 300 301 bool flow_block_cb_is_busy(flow_setup_cb_t *cb, void *cb_ident, 302 struct list_head *driver_block_list) 303 { 304 struct flow_block_cb *block_cb; 305 306 list_for_each_entry(block_cb, driver_block_list, driver_list) { 307 if (block_cb->cb == cb && 308 block_cb->cb_ident == cb_ident) 309 return true; 310 } 311 312 return false; 313 } 314 EXPORT_SYMBOL(flow_block_cb_is_busy); 315 316 int flow_block_cb_setup_simple(struct flow_block_offload *f, 317 struct list_head *driver_block_list, 318 flow_setup_cb_t *cb, 319 void *cb_ident, void *cb_priv, 320 bool ingress_only) 321 { 322 struct flow_block_cb *block_cb; 323 324 if (ingress_only && 325 f->binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS) 326 return -EOPNOTSUPP; 327 328 f->driver_block_list = driver_block_list; 329 330 switch (f->command) { 331 case FLOW_BLOCK_BIND: 332 if (flow_block_cb_is_busy(cb, cb_ident, driver_block_list)) 333 return -EBUSY; 334 335 block_cb = flow_block_cb_alloc(cb, cb_ident, cb_priv, NULL); 336 if (IS_ERR(block_cb)) 337 return PTR_ERR(block_cb); 338 339 flow_block_cb_add(block_cb, f); 340 list_add_tail(&block_cb->driver_list, driver_block_list); 341 return 0; 342 case FLOW_BLOCK_UNBIND: 343 block_cb = flow_block_cb_lookup(f->block, cb, cb_ident); 344 if (!block_cb) 345 return -ENOENT; 346 347 flow_block_cb_remove(block_cb, f); 348 list_del(&block_cb->driver_list); 349 return 0; 350 default: 351 return -EOPNOTSUPP; 352 } 353 } 354 EXPORT_SYMBOL(flow_block_cb_setup_simple); 355 356 static DEFINE_MUTEX(flow_indr_block_lock); 357 static LIST_HEAD(flow_block_indr_list); 358 static LIST_HEAD(flow_block_indr_dev_list); 359 static LIST_HEAD(flow_indir_dev_list); 360 361 struct flow_indr_dev { 362 struct list_head list; 363 flow_indr_block_bind_cb_t *cb; 364 void *cb_priv; 365 refcount_t refcnt; 366 }; 367 368 static struct flow_indr_dev *flow_indr_dev_alloc(flow_indr_block_bind_cb_t *cb, 369 void *cb_priv) 370 { 371 struct flow_indr_dev *indr_dev; 372 373 indr_dev = kmalloc(sizeof(*indr_dev), GFP_KERNEL); 374 if (!indr_dev) 375 return NULL; 376 377 indr_dev->cb = cb; 378 indr_dev->cb_priv = cb_priv; 379 refcount_set(&indr_dev->refcnt, 1); 380 381 return indr_dev; 382 } 383 384 struct flow_indir_dev_info { 385 void *data; 386 struct net_device *dev; 387 struct Qdisc *sch; 388 enum tc_setup_type type; 389 void (*cleanup)(struct flow_block_cb *block_cb); 390 struct list_head list; 391 enum flow_block_command command; 392 enum flow_block_binder_type binder_type; 393 struct list_head *cb_list; 394 }; 395 396 static void existing_qdiscs_register(flow_indr_block_bind_cb_t *cb, void *cb_priv) 397 { 398 struct flow_block_offload bo; 399 struct flow_indir_dev_info *cur; 400 401 list_for_each_entry(cur, &flow_indir_dev_list, list) { 402 memset(&bo, 0, sizeof(bo)); 403 bo.command = cur->command; 404 bo.binder_type = cur->binder_type; 405 INIT_LIST_HEAD(&bo.cb_list); 406 cb(cur->dev, cur->sch, cb_priv, cur->type, &bo, cur->data, cur->cleanup); 407 list_splice(&bo.cb_list, cur->cb_list); 408 } 409 } 410 411 int flow_indr_dev_register(flow_indr_block_bind_cb_t *cb, void *cb_priv) 412 { 413 struct flow_indr_dev *indr_dev; 414 415 mutex_lock(&flow_indr_block_lock); 416 list_for_each_entry(indr_dev, &flow_block_indr_dev_list, list) { 417 if (indr_dev->cb == cb && 418 indr_dev->cb_priv == cb_priv) { 419 refcount_inc(&indr_dev->refcnt); 420 mutex_unlock(&flow_indr_block_lock); 421 return 0; 422 } 423 } 424 425 indr_dev = flow_indr_dev_alloc(cb, cb_priv); 426 if (!indr_dev) { 427 mutex_unlock(&flow_indr_block_lock); 428 return -ENOMEM; 429 } 430 431 list_add(&indr_dev->list, &flow_block_indr_dev_list); 432 existing_qdiscs_register(cb, cb_priv); 433 mutex_unlock(&flow_indr_block_lock); 434 435 tcf_action_reoffload_cb(cb, cb_priv, true); 436 437 return 0; 438 } 439 EXPORT_SYMBOL(flow_indr_dev_register); 440 441 static void __flow_block_indr_cleanup(void (*release)(void *cb_priv), 442 void *cb_priv, 443 struct list_head *cleanup_list) 444 { 445 struct flow_block_cb *this, *next; 446 447 list_for_each_entry_safe(this, next, &flow_block_indr_list, indr.list) { 448 if (this->release == release && 449 this->indr.cb_priv == cb_priv) 450 list_move(&this->indr.list, cleanup_list); 451 } 452 } 453 454 static void flow_block_indr_notify(struct list_head *cleanup_list) 455 { 456 struct flow_block_cb *this, *next; 457 458 list_for_each_entry_safe(this, next, cleanup_list, indr.list) { 459 list_del(&this->indr.list); 460 this->indr.cleanup(this); 461 } 462 } 463 464 void flow_indr_dev_unregister(flow_indr_block_bind_cb_t *cb, void *cb_priv, 465 void (*release)(void *cb_priv)) 466 { 467 struct flow_indr_dev *this, *next, *indr_dev = NULL; 468 LIST_HEAD(cleanup_list); 469 470 mutex_lock(&flow_indr_block_lock); 471 list_for_each_entry_safe(this, next, &flow_block_indr_dev_list, list) { 472 if (this->cb == cb && 473 this->cb_priv == cb_priv && 474 refcount_dec_and_test(&this->refcnt)) { 475 indr_dev = this; 476 list_del(&indr_dev->list); 477 break; 478 } 479 } 480 481 if (!indr_dev) { 482 mutex_unlock(&flow_indr_block_lock); 483 return; 484 } 485 486 __flow_block_indr_cleanup(release, cb_priv, &cleanup_list); 487 mutex_unlock(&flow_indr_block_lock); 488 489 tcf_action_reoffload_cb(cb, cb_priv, false); 490 flow_block_indr_notify(&cleanup_list); 491 kfree(indr_dev); 492 } 493 EXPORT_SYMBOL(flow_indr_dev_unregister); 494 495 static void flow_block_indr_init(struct flow_block_cb *flow_block, 496 struct flow_block_offload *bo, 497 struct net_device *dev, struct Qdisc *sch, void *data, 498 void *cb_priv, 499 void (*cleanup)(struct flow_block_cb *block_cb)) 500 { 501 flow_block->indr.binder_type = bo->binder_type; 502 flow_block->indr.data = data; 503 flow_block->indr.cb_priv = cb_priv; 504 flow_block->indr.dev = dev; 505 flow_block->indr.sch = sch; 506 flow_block->indr.cleanup = cleanup; 507 } 508 509 struct flow_block_cb *flow_indr_block_cb_alloc(flow_setup_cb_t *cb, 510 void *cb_ident, void *cb_priv, 511 void (*release)(void *cb_priv), 512 struct flow_block_offload *bo, 513 struct net_device *dev, 514 struct Qdisc *sch, void *data, 515 void *indr_cb_priv, 516 void (*cleanup)(struct flow_block_cb *block_cb)) 517 { 518 struct flow_block_cb *block_cb; 519 520 block_cb = flow_block_cb_alloc(cb, cb_ident, cb_priv, release); 521 if (IS_ERR(block_cb)) 522 goto out; 523 524 flow_block_indr_init(block_cb, bo, dev, sch, data, indr_cb_priv, cleanup); 525 list_add(&block_cb->indr.list, &flow_block_indr_list); 526 527 out: 528 return block_cb; 529 } 530 EXPORT_SYMBOL(flow_indr_block_cb_alloc); 531 532 static struct flow_indir_dev_info *find_indir_dev(void *data) 533 { 534 struct flow_indir_dev_info *cur; 535 536 list_for_each_entry(cur, &flow_indir_dev_list, list) { 537 if (cur->data == data) 538 return cur; 539 } 540 return NULL; 541 } 542 543 static int indir_dev_add(void *data, struct net_device *dev, struct Qdisc *sch, 544 enum tc_setup_type type, void (*cleanup)(struct flow_block_cb *block_cb), 545 struct flow_block_offload *bo) 546 { 547 struct flow_indir_dev_info *info; 548 549 info = find_indir_dev(data); 550 if (info) 551 return -EEXIST; 552 553 info = kzalloc(sizeof(*info), GFP_KERNEL); 554 if (!info) 555 return -ENOMEM; 556 557 info->data = data; 558 info->dev = dev; 559 info->sch = sch; 560 info->type = type; 561 info->cleanup = cleanup; 562 info->command = bo->command; 563 info->binder_type = bo->binder_type; 564 info->cb_list = bo->cb_list_head; 565 566 list_add(&info->list, &flow_indir_dev_list); 567 return 0; 568 } 569 570 static int indir_dev_remove(void *data) 571 { 572 struct flow_indir_dev_info *info; 573 574 info = find_indir_dev(data); 575 if (!info) 576 return -ENOENT; 577 578 list_del(&info->list); 579 580 kfree(info); 581 return 0; 582 } 583 584 int flow_indr_dev_setup_offload(struct net_device *dev, struct Qdisc *sch, 585 enum tc_setup_type type, void *data, 586 struct flow_block_offload *bo, 587 void (*cleanup)(struct flow_block_cb *block_cb)) 588 { 589 struct flow_indr_dev *this; 590 u32 count = 0; 591 int err; 592 593 mutex_lock(&flow_indr_block_lock); 594 if (bo) { 595 if (bo->command == FLOW_BLOCK_BIND) 596 indir_dev_add(data, dev, sch, type, cleanup, bo); 597 else if (bo->command == FLOW_BLOCK_UNBIND) 598 indir_dev_remove(data); 599 } 600 601 list_for_each_entry(this, &flow_block_indr_dev_list, list) { 602 err = this->cb(dev, sch, this->cb_priv, type, bo, data, cleanup); 603 if (!err) 604 count++; 605 } 606 607 mutex_unlock(&flow_indr_block_lock); 608 609 return (bo && list_empty(&bo->cb_list)) ? -EOPNOTSUPP : count; 610 } 611 EXPORT_SYMBOL(flow_indr_dev_setup_offload); 612 613 bool flow_indr_dev_exists(void) 614 { 615 return !list_empty(&flow_block_indr_dev_list); 616 } 617 EXPORT_SYMBOL(flow_indr_dev_exists); 618