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_arp(const struct flow_rule *rule, 101 struct flow_match_arp *out) 102 { 103 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ARP, out); 104 } 105 EXPORT_SYMBOL(flow_rule_match_arp); 106 107 void flow_rule_match_ipv4_addrs(const struct flow_rule *rule, 108 struct flow_match_ipv4_addrs *out) 109 { 110 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_IPV4_ADDRS, out); 111 } 112 EXPORT_SYMBOL(flow_rule_match_ipv4_addrs); 113 114 void flow_rule_match_ipv6_addrs(const struct flow_rule *rule, 115 struct flow_match_ipv6_addrs *out) 116 { 117 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_IPV6_ADDRS, out); 118 } 119 EXPORT_SYMBOL(flow_rule_match_ipv6_addrs); 120 121 void flow_rule_match_ip(const struct flow_rule *rule, 122 struct flow_match_ip *out) 123 { 124 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_IP, out); 125 } 126 EXPORT_SYMBOL(flow_rule_match_ip); 127 128 void flow_rule_match_ports(const struct flow_rule *rule, 129 struct flow_match_ports *out) 130 { 131 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_PORTS, out); 132 } 133 EXPORT_SYMBOL(flow_rule_match_ports); 134 135 void flow_rule_match_ports_range(const struct flow_rule *rule, 136 struct flow_match_ports_range *out) 137 { 138 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_PORTS_RANGE, out); 139 } 140 EXPORT_SYMBOL(flow_rule_match_ports_range); 141 142 void flow_rule_match_tcp(const struct flow_rule *rule, 143 struct flow_match_tcp *out) 144 { 145 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_TCP, out); 146 } 147 EXPORT_SYMBOL(flow_rule_match_tcp); 148 149 void flow_rule_match_ipsec(const struct flow_rule *rule, 150 struct flow_match_ipsec *out) 151 { 152 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_IPSEC, out); 153 } 154 EXPORT_SYMBOL(flow_rule_match_ipsec); 155 156 void flow_rule_match_icmp(const struct flow_rule *rule, 157 struct flow_match_icmp *out) 158 { 159 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ICMP, out); 160 } 161 EXPORT_SYMBOL(flow_rule_match_icmp); 162 163 void flow_rule_match_mpls(const struct flow_rule *rule, 164 struct flow_match_mpls *out) 165 { 166 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_MPLS, out); 167 } 168 EXPORT_SYMBOL(flow_rule_match_mpls); 169 170 void flow_rule_match_enc_control(const struct flow_rule *rule, 171 struct flow_match_control *out) 172 { 173 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_CONTROL, out); 174 } 175 EXPORT_SYMBOL(flow_rule_match_enc_control); 176 177 void flow_rule_match_enc_ipv4_addrs(const struct flow_rule *rule, 178 struct flow_match_ipv4_addrs *out) 179 { 180 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS, out); 181 } 182 EXPORT_SYMBOL(flow_rule_match_enc_ipv4_addrs); 183 184 void flow_rule_match_enc_ipv6_addrs(const struct flow_rule *rule, 185 struct flow_match_ipv6_addrs *out) 186 { 187 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS, out); 188 } 189 EXPORT_SYMBOL(flow_rule_match_enc_ipv6_addrs); 190 191 void flow_rule_match_enc_ip(const struct flow_rule *rule, 192 struct flow_match_ip *out) 193 { 194 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_IP, out); 195 } 196 EXPORT_SYMBOL(flow_rule_match_enc_ip); 197 198 void flow_rule_match_enc_ports(const struct flow_rule *rule, 199 struct flow_match_ports *out) 200 { 201 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_PORTS, out); 202 } 203 EXPORT_SYMBOL(flow_rule_match_enc_ports); 204 205 void flow_rule_match_enc_keyid(const struct flow_rule *rule, 206 struct flow_match_enc_keyid *out) 207 { 208 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_KEYID, out); 209 } 210 EXPORT_SYMBOL(flow_rule_match_enc_keyid); 211 212 void flow_rule_match_enc_opts(const struct flow_rule *rule, 213 struct flow_match_enc_opts *out) 214 { 215 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_OPTS, out); 216 } 217 EXPORT_SYMBOL(flow_rule_match_enc_opts); 218 219 struct flow_action_cookie *flow_action_cookie_create(void *data, 220 unsigned int len, 221 gfp_t gfp) 222 { 223 struct flow_action_cookie *cookie; 224 225 cookie = kmalloc(sizeof(*cookie) + len, gfp); 226 if (!cookie) 227 return NULL; 228 cookie->cookie_len = len; 229 memcpy(cookie->cookie, data, len); 230 return cookie; 231 } 232 EXPORT_SYMBOL(flow_action_cookie_create); 233 234 void flow_action_cookie_destroy(struct flow_action_cookie *cookie) 235 { 236 kfree(cookie); 237 } 238 EXPORT_SYMBOL(flow_action_cookie_destroy); 239 240 void flow_rule_match_ct(const struct flow_rule *rule, 241 struct flow_match_ct *out) 242 { 243 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_CT, out); 244 } 245 EXPORT_SYMBOL(flow_rule_match_ct); 246 247 void flow_rule_match_pppoe(const struct flow_rule *rule, 248 struct flow_match_pppoe *out) 249 { 250 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_PPPOE, out); 251 } 252 EXPORT_SYMBOL(flow_rule_match_pppoe); 253 254 void flow_rule_match_l2tpv3(const struct flow_rule *rule, 255 struct flow_match_l2tpv3 *out) 256 { 257 FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_L2TPV3, out); 258 } 259 EXPORT_SYMBOL(flow_rule_match_l2tpv3); 260 261 struct flow_block_cb *flow_block_cb_alloc(flow_setup_cb_t *cb, 262 void *cb_ident, void *cb_priv, 263 void (*release)(void *cb_priv)) 264 { 265 struct flow_block_cb *block_cb; 266 267 block_cb = kzalloc(sizeof(*block_cb), GFP_KERNEL); 268 if (!block_cb) 269 return ERR_PTR(-ENOMEM); 270 271 block_cb->cb = cb; 272 block_cb->cb_ident = cb_ident; 273 block_cb->cb_priv = cb_priv; 274 block_cb->release = release; 275 276 return block_cb; 277 } 278 EXPORT_SYMBOL(flow_block_cb_alloc); 279 280 void flow_block_cb_free(struct flow_block_cb *block_cb) 281 { 282 if (block_cb->release) 283 block_cb->release(block_cb->cb_priv); 284 285 kfree(block_cb); 286 } 287 EXPORT_SYMBOL(flow_block_cb_free); 288 289 struct flow_block_cb *flow_block_cb_lookup(struct flow_block *block, 290 flow_setup_cb_t *cb, void *cb_ident) 291 { 292 struct flow_block_cb *block_cb; 293 294 list_for_each_entry(block_cb, &block->cb_list, list) { 295 if (block_cb->cb == cb && 296 block_cb->cb_ident == cb_ident) 297 return block_cb; 298 } 299 300 return NULL; 301 } 302 EXPORT_SYMBOL(flow_block_cb_lookup); 303 304 void *flow_block_cb_priv(struct flow_block_cb *block_cb) 305 { 306 return block_cb->cb_priv; 307 } 308 EXPORT_SYMBOL(flow_block_cb_priv); 309 310 void flow_block_cb_incref(struct flow_block_cb *block_cb) 311 { 312 block_cb->refcnt++; 313 } 314 EXPORT_SYMBOL(flow_block_cb_incref); 315 316 unsigned int flow_block_cb_decref(struct flow_block_cb *block_cb) 317 { 318 return --block_cb->refcnt; 319 } 320 EXPORT_SYMBOL(flow_block_cb_decref); 321 322 bool flow_block_cb_is_busy(flow_setup_cb_t *cb, void *cb_ident, 323 struct list_head *driver_block_list) 324 { 325 struct flow_block_cb *block_cb; 326 327 list_for_each_entry(block_cb, driver_block_list, driver_list) { 328 if (block_cb->cb == cb && 329 block_cb->cb_ident == cb_ident) 330 return true; 331 } 332 333 return false; 334 } 335 EXPORT_SYMBOL(flow_block_cb_is_busy); 336 337 int flow_block_cb_setup_simple(struct flow_block_offload *f, 338 struct list_head *driver_block_list, 339 flow_setup_cb_t *cb, 340 void *cb_ident, void *cb_priv, 341 bool ingress_only) 342 { 343 struct flow_block_cb *block_cb; 344 345 if (ingress_only && 346 f->binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS) 347 return -EOPNOTSUPP; 348 349 f->driver_block_list = driver_block_list; 350 351 switch (f->command) { 352 case FLOW_BLOCK_BIND: 353 if (flow_block_cb_is_busy(cb, cb_ident, driver_block_list)) 354 return -EBUSY; 355 356 block_cb = flow_block_cb_alloc(cb, cb_ident, cb_priv, NULL); 357 if (IS_ERR(block_cb)) 358 return PTR_ERR(block_cb); 359 360 flow_block_cb_add(block_cb, f); 361 list_add_tail(&block_cb->driver_list, driver_block_list); 362 return 0; 363 case FLOW_BLOCK_UNBIND: 364 block_cb = flow_block_cb_lookup(f->block, cb, cb_ident); 365 if (!block_cb) 366 return -ENOENT; 367 368 flow_block_cb_remove(block_cb, f); 369 list_del(&block_cb->driver_list); 370 return 0; 371 default: 372 return -EOPNOTSUPP; 373 } 374 } 375 EXPORT_SYMBOL(flow_block_cb_setup_simple); 376 377 static DEFINE_MUTEX(flow_indr_block_lock); 378 static LIST_HEAD(flow_block_indr_list); 379 static LIST_HEAD(flow_block_indr_dev_list); 380 static LIST_HEAD(flow_indir_dev_list); 381 382 struct flow_indr_dev { 383 struct list_head list; 384 flow_indr_block_bind_cb_t *cb; 385 void *cb_priv; 386 refcount_t refcnt; 387 }; 388 389 static struct flow_indr_dev *flow_indr_dev_alloc(flow_indr_block_bind_cb_t *cb, 390 void *cb_priv) 391 { 392 struct flow_indr_dev *indr_dev; 393 394 indr_dev = kmalloc(sizeof(*indr_dev), GFP_KERNEL); 395 if (!indr_dev) 396 return NULL; 397 398 indr_dev->cb = cb; 399 indr_dev->cb_priv = cb_priv; 400 refcount_set(&indr_dev->refcnt, 1); 401 402 return indr_dev; 403 } 404 405 struct flow_indir_dev_info { 406 void *data; 407 struct net_device *dev; 408 struct Qdisc *sch; 409 enum tc_setup_type type; 410 void (*cleanup)(struct flow_block_cb *block_cb); 411 struct list_head list; 412 enum flow_block_command command; 413 enum flow_block_binder_type binder_type; 414 struct list_head *cb_list; 415 }; 416 417 static void existing_qdiscs_register(flow_indr_block_bind_cb_t *cb, void *cb_priv) 418 { 419 struct flow_block_offload bo; 420 struct flow_indir_dev_info *cur; 421 422 list_for_each_entry(cur, &flow_indir_dev_list, list) { 423 memset(&bo, 0, sizeof(bo)); 424 bo.command = cur->command; 425 bo.binder_type = cur->binder_type; 426 INIT_LIST_HEAD(&bo.cb_list); 427 cb(cur->dev, cur->sch, cb_priv, cur->type, &bo, cur->data, cur->cleanup); 428 list_splice(&bo.cb_list, cur->cb_list); 429 } 430 } 431 432 int flow_indr_dev_register(flow_indr_block_bind_cb_t *cb, void *cb_priv) 433 { 434 struct flow_indr_dev *indr_dev; 435 436 mutex_lock(&flow_indr_block_lock); 437 list_for_each_entry(indr_dev, &flow_block_indr_dev_list, list) { 438 if (indr_dev->cb == cb && 439 indr_dev->cb_priv == cb_priv) { 440 refcount_inc(&indr_dev->refcnt); 441 mutex_unlock(&flow_indr_block_lock); 442 return 0; 443 } 444 } 445 446 indr_dev = flow_indr_dev_alloc(cb, cb_priv); 447 if (!indr_dev) { 448 mutex_unlock(&flow_indr_block_lock); 449 return -ENOMEM; 450 } 451 452 list_add(&indr_dev->list, &flow_block_indr_dev_list); 453 existing_qdiscs_register(cb, cb_priv); 454 mutex_unlock(&flow_indr_block_lock); 455 456 tcf_action_reoffload_cb(cb, cb_priv, true); 457 458 return 0; 459 } 460 EXPORT_SYMBOL(flow_indr_dev_register); 461 462 static void __flow_block_indr_cleanup(void (*release)(void *cb_priv), 463 void *cb_priv, 464 struct list_head *cleanup_list) 465 { 466 struct flow_block_cb *this, *next; 467 468 list_for_each_entry_safe(this, next, &flow_block_indr_list, indr.list) { 469 if (this->release == release && 470 this->indr.cb_priv == cb_priv) 471 list_move(&this->indr.list, cleanup_list); 472 } 473 } 474 475 static void flow_block_indr_notify(struct list_head *cleanup_list) 476 { 477 struct flow_block_cb *this, *next; 478 479 list_for_each_entry_safe(this, next, cleanup_list, indr.list) { 480 list_del(&this->indr.list); 481 this->indr.cleanup(this); 482 } 483 } 484 485 void flow_indr_dev_unregister(flow_indr_block_bind_cb_t *cb, void *cb_priv, 486 void (*release)(void *cb_priv)) 487 { 488 struct flow_indr_dev *this, *next, *indr_dev = NULL; 489 LIST_HEAD(cleanup_list); 490 491 mutex_lock(&flow_indr_block_lock); 492 list_for_each_entry_safe(this, next, &flow_block_indr_dev_list, list) { 493 if (this->cb == cb && 494 this->cb_priv == cb_priv && 495 refcount_dec_and_test(&this->refcnt)) { 496 indr_dev = this; 497 list_del(&indr_dev->list); 498 break; 499 } 500 } 501 502 if (!indr_dev) { 503 mutex_unlock(&flow_indr_block_lock); 504 return; 505 } 506 507 __flow_block_indr_cleanup(release, cb_priv, &cleanup_list); 508 mutex_unlock(&flow_indr_block_lock); 509 510 tcf_action_reoffload_cb(cb, cb_priv, false); 511 flow_block_indr_notify(&cleanup_list); 512 kfree(indr_dev); 513 } 514 EXPORT_SYMBOL(flow_indr_dev_unregister); 515 516 static void flow_block_indr_init(struct flow_block_cb *flow_block, 517 struct flow_block_offload *bo, 518 struct net_device *dev, struct Qdisc *sch, void *data, 519 void *cb_priv, 520 void (*cleanup)(struct flow_block_cb *block_cb)) 521 { 522 flow_block->indr.binder_type = bo->binder_type; 523 flow_block->indr.data = data; 524 flow_block->indr.cb_priv = cb_priv; 525 flow_block->indr.dev = dev; 526 flow_block->indr.sch = sch; 527 flow_block->indr.cleanup = cleanup; 528 } 529 530 struct flow_block_cb *flow_indr_block_cb_alloc(flow_setup_cb_t *cb, 531 void *cb_ident, void *cb_priv, 532 void (*release)(void *cb_priv), 533 struct flow_block_offload *bo, 534 struct net_device *dev, 535 struct Qdisc *sch, void *data, 536 void *indr_cb_priv, 537 void (*cleanup)(struct flow_block_cb *block_cb)) 538 { 539 struct flow_block_cb *block_cb; 540 541 block_cb = flow_block_cb_alloc(cb, cb_ident, cb_priv, release); 542 if (IS_ERR(block_cb)) 543 goto out; 544 545 flow_block_indr_init(block_cb, bo, dev, sch, data, indr_cb_priv, cleanup); 546 list_add(&block_cb->indr.list, &flow_block_indr_list); 547 548 out: 549 return block_cb; 550 } 551 EXPORT_SYMBOL(flow_indr_block_cb_alloc); 552 553 static struct flow_indir_dev_info *find_indir_dev(void *data) 554 { 555 struct flow_indir_dev_info *cur; 556 557 list_for_each_entry(cur, &flow_indir_dev_list, list) { 558 if (cur->data == data) 559 return cur; 560 } 561 return NULL; 562 } 563 564 static int indir_dev_add(void *data, struct net_device *dev, struct Qdisc *sch, 565 enum tc_setup_type type, void (*cleanup)(struct flow_block_cb *block_cb), 566 struct flow_block_offload *bo) 567 { 568 struct flow_indir_dev_info *info; 569 570 info = find_indir_dev(data); 571 if (info) 572 return -EEXIST; 573 574 info = kzalloc(sizeof(*info), GFP_KERNEL); 575 if (!info) 576 return -ENOMEM; 577 578 info->data = data; 579 info->dev = dev; 580 info->sch = sch; 581 info->type = type; 582 info->cleanup = cleanup; 583 info->command = bo->command; 584 info->binder_type = bo->binder_type; 585 info->cb_list = bo->cb_list_head; 586 587 list_add(&info->list, &flow_indir_dev_list); 588 return 0; 589 } 590 591 static int indir_dev_remove(void *data) 592 { 593 struct flow_indir_dev_info *info; 594 595 info = find_indir_dev(data); 596 if (!info) 597 return -ENOENT; 598 599 list_del(&info->list); 600 601 kfree(info); 602 return 0; 603 } 604 605 int flow_indr_dev_setup_offload(struct net_device *dev, struct Qdisc *sch, 606 enum tc_setup_type type, void *data, 607 struct flow_block_offload *bo, 608 void (*cleanup)(struct flow_block_cb *block_cb)) 609 { 610 struct flow_indr_dev *this; 611 u32 count = 0; 612 int err; 613 614 mutex_lock(&flow_indr_block_lock); 615 if (bo) { 616 if (bo->command == FLOW_BLOCK_BIND) 617 indir_dev_add(data, dev, sch, type, cleanup, bo); 618 else if (bo->command == FLOW_BLOCK_UNBIND) 619 indir_dev_remove(data); 620 } 621 622 list_for_each_entry(this, &flow_block_indr_dev_list, list) { 623 err = this->cb(dev, sch, this->cb_priv, type, bo, data, cleanup); 624 if (!err) 625 count++; 626 } 627 628 mutex_unlock(&flow_indr_block_lock); 629 630 return (bo && list_empty(&bo->cb_list)) ? -EOPNOTSUPP : count; 631 } 632 EXPORT_SYMBOL(flow_indr_dev_setup_offload); 633 634 bool flow_indr_dev_exists(void) 635 { 636 return !list_empty(&flow_block_indr_dev_list); 637 } 638 EXPORT_SYMBOL(flow_indr_dev_exists); 639