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 void flow_rule_match_l2tpv3(const struct flow_rule *rule,
 241                             struct flow_match_l2tpv3 *out)
 242 {
 243         FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_L2TPV3, out);
 244 }
 245 EXPORT_SYMBOL(flow_rule_match_l2tpv3);
 246
 247 struct flow_block_cb *flow_block_cb_alloc(flow_setup_cb_t *cb,
 248                                           void *cb_ident, void *cb_priv,
 249                                           void (*release)(void *cb_priv))
 250 {
 251         struct flow_block_cb *block_cb;
 252
 253         block_cb = kzalloc(sizeof(*block_cb), GFP_KERNEL);
 254         if (!block_cb)
 255                 return ERR_PTR(-ENOMEM);
 256
 257         block_cb->cb = cb;
 258         block_cb->cb_ident = cb_ident;
 259         block_cb->cb_priv = cb_priv;
 260         block_cb->release = release;
 261
 262         return block_cb;
 263 }
 264 EXPORT_SYMBOL(flow_block_cb_alloc);
 265
 266 void flow_block_cb_free(struct flow_block_cb *block_cb)
 267 {
 268         if (block_cb->release)
 269                 block_cb->release(block_cb->cb_priv);
 270
 271         kfree(block_cb);
 272 }
 273 EXPORT_SYMBOL(flow_block_cb_free);
 274
 275 struct flow_block_cb *flow_block_cb_lookup(struct flow_block *block,
 276                                            flow_setup_cb_t *cb, void *cb_ident)
 277 {
 278         struct flow_block_cb *block_cb;
 279
 280         list_for_each_entry(block_cb, &block->cb_list, list) {
 281                 if (block_cb->cb == cb &&
 282                     block_cb->cb_ident == cb_ident)
 283                         return block_cb;
 284         }
 285
 286         return NULL;
 287 }
 288 EXPORT_SYMBOL(flow_block_cb_lookup);
 289
 290 void *flow_block_cb_priv(struct flow_block_cb *block_cb)
 291 {
 292         return block_cb->cb_priv;
 293 }
 294 EXPORT_SYMBOL(flow_block_cb_priv);
 295
 296 void flow_block_cb_incref(struct flow_block_cb *block_cb)
 297 {
 298         block_cb->refcnt++;
 299 }
 300 EXPORT_SYMBOL(flow_block_cb_incref);
 301
 302 unsigned int flow_block_cb_decref(struct flow_block_cb *block_cb)
 303 {
 304         return --block_cb->refcnt;
 305 }
 306 EXPORT_SYMBOL(flow_block_cb_decref);
 307
 308 bool flow_block_cb_is_busy(flow_setup_cb_t *cb, void *cb_ident,
 309                            struct list_head *driver_block_list)
 310 {
 311         struct flow_block_cb *block_cb;
 312
 313         list_for_each_entry(block_cb, driver_block_list, driver_list) {
 314                 if (block_cb->cb == cb &&
 315                     block_cb->cb_ident == cb_ident)
 316                         return true;
 317         }
 318
 319         return false;
 320 }
 321 EXPORT_SYMBOL(flow_block_cb_is_busy);
 322
 323 int flow_block_cb_setup_simple(struct flow_block_offload *f,
 324                                struct list_head *driver_block_list,
 325                                flow_setup_cb_t *cb,
 326                                void *cb_ident, void *cb_priv,
 327                                bool ingress_only)
 328 {
 329         struct flow_block_cb *block_cb;
 330
 331         if (ingress_only &&
 332             f->binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
 333                 return -EOPNOTSUPP;
 334
 335         f->driver_block_list = driver_block_list;
 336
 337         switch (f->command) {
 338         case FLOW_BLOCK_BIND:
 339                 if (flow_block_cb_is_busy(cb, cb_ident, driver_block_list))
 340                         return -EBUSY;
 341
 342                 block_cb = flow_block_cb_alloc(cb, cb_ident, cb_priv, NULL);
 343                 if (IS_ERR(block_cb))
 344                         return PTR_ERR(block_cb);
 345
 346                 flow_block_cb_add(block_cb, f);
 347                 list_add_tail(&block_cb->driver_list, driver_block_list);
 348                 return 0;
 349         case FLOW_BLOCK_UNBIND:
 350                 block_cb = flow_block_cb_lookup(f->block, cb, cb_ident);
 351                 if (!block_cb)
 352                         return -ENOENT;
 353
 354                 flow_block_cb_remove(block_cb, f);
 355                 list_del(&block_cb->driver_list);
 356                 return 0;
 357         default:
 358                 return -EOPNOTSUPP;
 359         }
 360 }
 361 EXPORT_SYMBOL(flow_block_cb_setup_simple);
 362
 363 static DEFINE_MUTEX(flow_indr_block_lock);
 364 static LIST_HEAD(flow_block_indr_list);
 365 static LIST_HEAD(flow_block_indr_dev_list);
 366 static LIST_HEAD(flow_indir_dev_list);
 367
 368 struct flow_indr_dev {
 369         struct list_head                list;
 370         flow_indr_block_bind_cb_t       *cb;
 371         void                            *cb_priv;
 372         refcount_t                      refcnt;
 373 };
 374
 375 static struct flow_indr_dev *flow_indr_dev_alloc(flow_indr_block_bind_cb_t *cb,
 376                                                  void *cb_priv)
 377 {
 378         struct flow_indr_dev *indr_dev;
 379
 380         indr_dev = kmalloc(sizeof(*indr_dev), GFP_KERNEL);
 381         if (!indr_dev)
 382                 return NULL;
 383
 384         indr_dev->cb            = cb;
 385         indr_dev->cb_priv       = cb_priv;
 386         refcount_set(&indr_dev->refcnt, 1);
 387
 388         return indr_dev;
 389 }
 390
 391 struct flow_indir_dev_info {
 392         void *data;
 393         struct net_device *dev;
 394         struct Qdisc *sch;
 395         enum tc_setup_type type;
 396         void (*cleanup)(struct flow_block_cb *block_cb);
 397         struct list_head list;
 398         enum flow_block_command command;
 399         enum flow_block_binder_type binder_type;
 400         struct list_head *cb_list;
 401 };
 402
 403 static void existing_qdiscs_register(flow_indr_block_bind_cb_t *cb, void *cb_priv)
 404 {
 405         struct flow_block_offload bo;
 406         struct flow_indir_dev_info *cur;
 407
 408         list_for_each_entry(cur, &flow_indir_dev_list, list) {
 409                 memset(&bo, 0, sizeof(bo));
 410                 bo.command = cur->command;
 411                 bo.binder_type = cur->binder_type;
 412                 INIT_LIST_HEAD(&bo.cb_list);
 413                 cb(cur->dev, cur->sch, cb_priv, cur->type, &bo, cur->data, cur->cleanup);
 414                 list_splice(&bo.cb_list, cur->cb_list);
 415         }
 416 }
 417
 418 int flow_indr_dev_register(flow_indr_block_bind_cb_t *cb, void *cb_priv)
 419 {
 420         struct flow_indr_dev *indr_dev;
 421
 422         mutex_lock(&flow_indr_block_lock);
 423         list_for_each_entry(indr_dev, &flow_block_indr_dev_list, list) {
 424                 if (indr_dev->cb == cb &&
 425                     indr_dev->cb_priv == cb_priv) {
 426                         refcount_inc(&indr_dev->refcnt);
 427                         mutex_unlock(&flow_indr_block_lock);
 428                         return 0;
 429                 }
 430         }
 431
 432         indr_dev = flow_indr_dev_alloc(cb, cb_priv);
 433         if (!indr_dev) {
 434                 mutex_unlock(&flow_indr_block_lock);
 435                 return -ENOMEM;
 436         }
 437
 438         list_add(&indr_dev->list, &flow_block_indr_dev_list);
 439         existing_qdiscs_register(cb, cb_priv);
 440         mutex_unlock(&flow_indr_block_lock);
 441
 442         tcf_action_reoffload_cb(cb, cb_priv, true);
 443
 444         return 0;
 445 }
 446 EXPORT_SYMBOL(flow_indr_dev_register);
 447
 448 static void __flow_block_indr_cleanup(void (*release)(void *cb_priv),
 449                                       void *cb_priv,
 450                                       struct list_head *cleanup_list)
 451 {
 452         struct flow_block_cb *this, *next;
 453
 454         list_for_each_entry_safe(this, next, &flow_block_indr_list, indr.list) {
 455                 if (this->release == release &&
 456                     this->indr.cb_priv == cb_priv)
 457                         list_move(&this->indr.list, cleanup_list);
 458         }
 459 }
 460
 461 static void flow_block_indr_notify(struct list_head *cleanup_list)
 462 {
 463         struct flow_block_cb *this, *next;
 464
 465         list_for_each_entry_safe(this, next, cleanup_list, indr.list) {
 466                 list_del(&this->indr.list);
 467                 this->indr.cleanup(this);
 468         }
 469 }
 470
 471 void flow_indr_dev_unregister(flow_indr_block_bind_cb_t *cb, void *cb_priv,
 472                               void (*release)(void *cb_priv))
 473 {
 474         struct flow_indr_dev *this, *next, *indr_dev = NULL;
 475         LIST_HEAD(cleanup_list);
 476
 477         mutex_lock(&flow_indr_block_lock);
 478         list_for_each_entry_safe(this, next, &flow_block_indr_dev_list, list) {
 479                 if (this->cb == cb &&
 480                     this->cb_priv == cb_priv &&
 481                     refcount_dec_and_test(&this->refcnt)) {
 482                         indr_dev = this;
 483                         list_del(&indr_dev->list);
 484                         break;
 485                 }
 486         }
 487
 488         if (!indr_dev) {
 489                 mutex_unlock(&flow_indr_block_lock);
 490                 return;
 491         }
 492
 493         __flow_block_indr_cleanup(release, cb_priv, &cleanup_list);
 494         mutex_unlock(&flow_indr_block_lock);
 495
 496         tcf_action_reoffload_cb(cb, cb_priv, false);
 497         flow_block_indr_notify(&cleanup_list);
 498         kfree(indr_dev);
 499 }
 500 EXPORT_SYMBOL(flow_indr_dev_unregister);
 501
 502 static void flow_block_indr_init(struct flow_block_cb *flow_block,
 503                                  struct flow_block_offload *bo,
 504                                  struct net_device *dev, struct Qdisc *sch, void *data,
 505                                  void *cb_priv,
 506                                  void (*cleanup)(struct flow_block_cb *block_cb))
 507 {
 508         flow_block->indr.binder_type = bo->binder_type;
 509         flow_block->indr.data = data;
 510         flow_block->indr.cb_priv = cb_priv;
 511         flow_block->indr.dev = dev;
 512         flow_block->indr.sch = sch;
 513         flow_block->indr.cleanup = cleanup;
 514 }
 515
 516 struct flow_block_cb *flow_indr_block_cb_alloc(flow_setup_cb_t *cb,
 517                                                void *cb_ident, void *cb_priv,
 518                                                void (*release)(void *cb_priv),
 519                                                struct flow_block_offload *bo,
 520                                                struct net_device *dev,
 521                                                struct Qdisc *sch, void *data,
 522                                                void *indr_cb_priv,
 523                                                void (*cleanup)(struct flow_block_cb *block_cb))
 524 {
 525         struct flow_block_cb *block_cb;
 526
 527         block_cb = flow_block_cb_alloc(cb, cb_ident, cb_priv, release);
 528         if (IS_ERR(block_cb))
 529                 goto out;
 530
 531         flow_block_indr_init(block_cb, bo, dev, sch, data, indr_cb_priv, cleanup);
 532         list_add(&block_cb->indr.list, &flow_block_indr_list);
 533
 534 out:
 535         return block_cb;
 536 }
 537 EXPORT_SYMBOL(flow_indr_block_cb_alloc);
 538
 539 static struct flow_indir_dev_info *find_indir_dev(void *data)
 540 {
 541         struct flow_indir_dev_info *cur;
 542
 543         list_for_each_entry(cur, &flow_indir_dev_list, list) {
 544                 if (cur->data == data)
 545                         return cur;
 546         }
 547         return NULL;
 548 }
 549
 550 static int indir_dev_add(void *data, struct net_device *dev, struct Qdisc *sch,
 551                          enum tc_setup_type type, void (*cleanup)(struct flow_block_cb *block_cb),
 552                          struct flow_block_offload *bo)
 553 {
 554         struct flow_indir_dev_info *info;
 555
 556         info = find_indir_dev(data);
 557         if (info)
 558                 return -EEXIST;
 559
 560         info = kzalloc(sizeof(*info), GFP_KERNEL);
 561         if (!info)
 562                 return -ENOMEM;
 563
 564         info->data = data;
 565         info->dev = dev;
 566         info->sch = sch;
 567         info->type = type;
 568         info->cleanup = cleanup;
 569         info->command = bo->command;
 570         info->binder_type = bo->binder_type;
 571         info->cb_list = bo->cb_list_head;
 572
 573         list_add(&info->list, &flow_indir_dev_list);
 574         return 0;
 575 }
 576
 577 static int indir_dev_remove(void *data)
 578 {
 579         struct flow_indir_dev_info *info;
 580
 581         info = find_indir_dev(data);
 582         if (!info)
 583                 return -ENOENT;
 584
 585         list_del(&info->list);
 586
 587         kfree(info);
 588         return 0;
 589 }
 590
 591 int flow_indr_dev_setup_offload(struct net_device *dev, struct Qdisc *sch,
 592                                 enum tc_setup_type type, void *data,
 593                                 struct flow_block_offload *bo,
 594                                 void (*cleanup)(struct flow_block_cb *block_cb))
 595 {
 596         struct flow_indr_dev *this;
 597         u32 count = 0;
 598         int err;
 599
 600         mutex_lock(&flow_indr_block_lock);
 601         if (bo) {
 602                 if (bo->command == FLOW_BLOCK_BIND)
 603                         indir_dev_add(data, dev, sch, type, cleanup, bo);
 604                 else if (bo->command == FLOW_BLOCK_UNBIND)
 605                         indir_dev_remove(data);
 606         }
 607
 608         list_for_each_entry(this, &flow_block_indr_dev_list, list) {
 609                 err = this->cb(dev, sch, this->cb_priv, type, bo, data, cleanup);
 610                 if (!err)
 611                         count++;
 612         }
 613
 614         mutex_unlock(&flow_indr_block_lock);
 615
 616         return (bo && list_empty(&bo->cb_list)) ? -EOPNOTSUPP : count;
 617 }
 618 EXPORT_SYMBOL(flow_indr_dev_setup_offload);
 619
 620 bool flow_indr_dev_exists(void)
 621 {
 622         return !list_empty(&flow_block_indr_dev_list);
 623 }
 624 EXPORT_SYMBOL(flow_indr_dev_exists);