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_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);