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