net/core/flow_offload.c

   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);