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/flow_offload.h>
   5 #include <linux/rtnetlink.h>
   6 #include <linux/mutex.h>
   7 #include <linux/rhashtable.h>
   8
   9 struct flow_rule *flow_rule_alloc(unsigned int num_actions)
  10 {
  11         struct flow_rule *rule;
  12         int i;
  13
  14         rule = kzalloc(struct_size(rule, action.entries, num_actions),
  15                        GFP_KERNEL);
  16         if (!rule)
  17                 return NULL;
  18
  19         rule->action.num_entries = num_actions;
  20         /* Pre-fill each action hw_stats with DONT_CARE.
  21          * Caller can override this if it wants stats for a given action.
  22          */
  23         for (i = 0; i < num_actions; i++)
  24                 rule->action.entries[i].hw_stats = FLOW_ACTION_HW_STATS_DONT_CARE;
  25
  26         return rule;
  27 }
  28 EXPORT_SYMBOL(flow_rule_alloc);
  29
  30 #define FLOW_DISSECTOR_MATCH(__rule, __type, __out)                             \
  31         const struct flow_match *__m = &(__rule)->match;                        \
  32         struct flow_dissector *__d = (__m)->dissector;                          \
  33                                                                                 \
  34         (__out)->key = skb_flow_dissector_target(__d, __type, (__m)->key);      \
  35         (__out)->mask = skb_flow_dissector_target(__d, __type, (__m)->mask);    \
  36
  37 void flow_rule_match_meta(const struct flow_rule *rule,
  38                           struct flow_match_meta *out)
  39 {
  40         FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_META, out);
  41 }
  42 EXPORT_SYMBOL(flow_rule_match_meta);
  43
  44 void flow_rule_match_basic(const struct flow_rule *rule,
  45                            struct flow_match_basic *out)
  46 {
  47         FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_BASIC, out);
  48 }
  49 EXPORT_SYMBOL(flow_rule_match_basic);
  50
  51 void flow_rule_match_control(const struct flow_rule *rule,
  52                              struct flow_match_control *out)
  53 {
  54         FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_CONTROL, out);
  55 }
  56 EXPORT_SYMBOL(flow_rule_match_control);
  57
  58 void flow_rule_match_eth_addrs(const struct flow_rule *rule,
  59                                struct flow_match_eth_addrs *out)
  60 {
  61         FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS, out);
  62 }
  63 EXPORT_SYMBOL(flow_rule_match_eth_addrs);
  64
  65 void flow_rule_match_vlan(const struct flow_rule *rule,
  66                           struct flow_match_vlan *out)
  67 {
  68         FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_VLAN, out);
  69 }
  70 EXPORT_SYMBOL(flow_rule_match_vlan);
  71
  72 void flow_rule_match_cvlan(const struct flow_rule *rule,
  73                            struct flow_match_vlan *out)
  74 {
  75         FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_CVLAN, out);
  76 }
  77 EXPORT_SYMBOL(flow_rule_match_cvlan);
  78
  79 void flow_rule_match_ipv4_addrs(const struct flow_rule *rule,
  80                                 struct flow_match_ipv4_addrs *out)
  81 {
  82         FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_IPV4_ADDRS, out);
  83 }
  84 EXPORT_SYMBOL(flow_rule_match_ipv4_addrs);
  85
  86 void flow_rule_match_ipv6_addrs(const struct flow_rule *rule,
  87                                 struct flow_match_ipv6_addrs *out)
  88 {
  89         FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_IPV6_ADDRS, out);
  90 }
  91 EXPORT_SYMBOL(flow_rule_match_ipv6_addrs);
  92
  93 void flow_rule_match_ip(const struct flow_rule *rule,
  94                         struct flow_match_ip *out)
  95 {
  96         FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_IP, out);
  97 }
  98 EXPORT_SYMBOL(flow_rule_match_ip);
  99
 100 void flow_rule_match_ports(const struct flow_rule *rule,
 101                            struct flow_match_ports *out)
 102 {
 103         FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_PORTS, out);
 104 }
 105 EXPORT_SYMBOL(flow_rule_match_ports);
 106
 107 void flow_rule_match_tcp(const struct flow_rule *rule,
 108                          struct flow_match_tcp *out)
 109 {
 110         FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_TCP, out);
 111 }
 112 EXPORT_SYMBOL(flow_rule_match_tcp);
 113
 114 void flow_rule_match_icmp(const struct flow_rule *rule,
 115                           struct flow_match_icmp *out)
 116 {
 117         FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ICMP, out);
 118 }
 119 EXPORT_SYMBOL(flow_rule_match_icmp);
 120
 121 void flow_rule_match_mpls(const struct flow_rule *rule,
 122                           struct flow_match_mpls *out)
 123 {
 124         FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_MPLS, out);
 125 }
 126 EXPORT_SYMBOL(flow_rule_match_mpls);
 127
 128 void flow_rule_match_enc_control(const struct flow_rule *rule,
 129                                  struct flow_match_control *out)
 130 {
 131         FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_CONTROL, out);
 132 }
 133 EXPORT_SYMBOL(flow_rule_match_enc_control);
 134
 135 void flow_rule_match_enc_ipv4_addrs(const struct flow_rule *rule,
 136                                     struct flow_match_ipv4_addrs *out)
 137 {
 138         FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS, out);
 139 }
 140 EXPORT_SYMBOL(flow_rule_match_enc_ipv4_addrs);
 141
 142 void flow_rule_match_enc_ipv6_addrs(const struct flow_rule *rule,
 143                                     struct flow_match_ipv6_addrs *out)
 144 {
 145         FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS, out);
 146 }
 147 EXPORT_SYMBOL(flow_rule_match_enc_ipv6_addrs);
 148
 149 void flow_rule_match_enc_ip(const struct flow_rule *rule,
 150                             struct flow_match_ip *out)
 151 {
 152         FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_IP, out);
 153 }
 154 EXPORT_SYMBOL(flow_rule_match_enc_ip);
 155
 156 void flow_rule_match_enc_ports(const struct flow_rule *rule,
 157                                struct flow_match_ports *out)
 158 {
 159         FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_PORTS, out);
 160 }
 161 EXPORT_SYMBOL(flow_rule_match_enc_ports);
 162
 163 void flow_rule_match_enc_keyid(const struct flow_rule *rule,
 164                                struct flow_match_enc_keyid *out)
 165 {
 166         FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_KEYID, out);
 167 }
 168 EXPORT_SYMBOL(flow_rule_match_enc_keyid);
 169
 170 void flow_rule_match_enc_opts(const struct flow_rule *rule,
 171                               struct flow_match_enc_opts *out)
 172 {
 173         FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ENC_OPTS, out);
 174 }
 175 EXPORT_SYMBOL(flow_rule_match_enc_opts);
 176
 177 struct flow_action_cookie *flow_action_cookie_create(void *data,
 178                                                      unsigned int len,
 179                                                      gfp_t gfp)
 180 {
 181         struct flow_action_cookie *cookie;
 182
 183         cookie = kmalloc(sizeof(*cookie) + len, gfp);
 184         if (!cookie)
 185                 return NULL;
 186         cookie->cookie_len = len;
 187         memcpy(cookie->cookie, data, len);
 188         return cookie;
 189 }
 190 EXPORT_SYMBOL(flow_action_cookie_create);
 191
 192 void flow_action_cookie_destroy(struct flow_action_cookie *cookie)
 193 {
 194         kfree(cookie);
 195 }
 196 EXPORT_SYMBOL(flow_action_cookie_destroy);
 197
 198 void flow_rule_match_ct(const struct flow_rule *rule,
 199                         struct flow_match_ct *out)
 200 {
 201         FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_CT, out);
 202 }
 203 EXPORT_SYMBOL(flow_rule_match_ct);
 204
 205 struct flow_block_cb *flow_block_cb_alloc(flow_setup_cb_t *cb,
 206                                           void *cb_ident, void *cb_priv,
 207                                           void (*release)(void *cb_priv))
 208 {
 209         struct flow_block_cb *block_cb;
 210
 211         block_cb = kzalloc(sizeof(*block_cb), GFP_KERNEL);
 212         if (!block_cb)
 213                 return ERR_PTR(-ENOMEM);
 214
 215         block_cb->cb = cb;
 216         block_cb->cb_ident = cb_ident;
 217         block_cb->cb_priv = cb_priv;
 218         block_cb->release = release;
 219
 220         return block_cb;
 221 }
 222 EXPORT_SYMBOL(flow_block_cb_alloc);
 223
 224 void flow_block_cb_free(struct flow_block_cb *block_cb)
 225 {
 226         if (block_cb->release)
 227                 block_cb->release(block_cb->cb_priv);
 228
 229         kfree(block_cb);
 230 }
 231 EXPORT_SYMBOL(flow_block_cb_free);
 232
 233 struct flow_block_cb *flow_block_cb_lookup(struct flow_block *block,
 234                                            flow_setup_cb_t *cb, void *cb_ident)
 235 {
 236         struct flow_block_cb *block_cb;
 237
 238         list_for_each_entry(block_cb, &block->cb_list, list) {
 239                 if (block_cb->cb == cb &&
 240                     block_cb->cb_ident == cb_ident)
 241                         return block_cb;
 242         }
 243
 244         return NULL;
 245 }
 246 EXPORT_SYMBOL(flow_block_cb_lookup);
 247
 248 void *flow_block_cb_priv(struct flow_block_cb *block_cb)
 249 {
 250         return block_cb->cb_priv;
 251 }
 252 EXPORT_SYMBOL(flow_block_cb_priv);
 253
 254 void flow_block_cb_incref(struct flow_block_cb *block_cb)
 255 {
 256         block_cb->refcnt++;
 257 }
 258 EXPORT_SYMBOL(flow_block_cb_incref);
 259
 260 unsigned int flow_block_cb_decref(struct flow_block_cb *block_cb)
 261 {
 262         return --block_cb->refcnt;
 263 }
 264 EXPORT_SYMBOL(flow_block_cb_decref);
 265
 266 bool flow_block_cb_is_busy(flow_setup_cb_t *cb, void *cb_ident,
 267                            struct list_head *driver_block_list)
 268 {
 269         struct flow_block_cb *block_cb;
 270
 271         list_for_each_entry(block_cb, driver_block_list, driver_list) {
 272                 if (block_cb->cb == cb &&
 273                     block_cb->cb_ident == cb_ident)
 274                         return true;
 275         }
 276
 277         return false;
 278 }
 279 EXPORT_SYMBOL(flow_block_cb_is_busy);
 280
 281 int flow_block_cb_setup_simple(struct flow_block_offload *f,
 282                                struct list_head *driver_block_list,
 283                                flow_setup_cb_t *cb,
 284                                void *cb_ident, void *cb_priv,
 285                                bool ingress_only)
 286 {
 287         struct flow_block_cb *block_cb;
 288
 289         if (ingress_only &&
 290             f->binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
 291                 return -EOPNOTSUPP;
 292
 293         f->driver_block_list = driver_block_list;
 294
 295         switch (f->command) {
 296         case FLOW_BLOCK_BIND:
 297                 if (flow_block_cb_is_busy(cb, cb_ident, driver_block_list))
 298                         return -EBUSY;
 299
 300                 block_cb = flow_block_cb_alloc(cb, cb_ident, cb_priv, NULL);
 301                 if (IS_ERR(block_cb))
 302                         return PTR_ERR(block_cb);
 303
 304                 flow_block_cb_add(block_cb, f);
 305                 list_add_tail(&block_cb->driver_list, driver_block_list);
 306                 return 0;
 307         case FLOW_BLOCK_UNBIND:
 308                 block_cb = flow_block_cb_lookup(f->block, cb, cb_ident);
 309                 if (!block_cb)
 310                         return -ENOENT;
 311
 312                 flow_block_cb_remove(block_cb, f);
 313                 list_del(&block_cb->driver_list);
 314                 return 0;
 315         default:
 316                 return -EOPNOTSUPP;
 317         }
 318 }
 319 EXPORT_SYMBOL(flow_block_cb_setup_simple);
 320
 321 static DEFINE_MUTEX(flow_indr_block_lock);
 322 static LIST_HEAD(flow_block_indr_list);
 323 static LIST_HEAD(flow_block_indr_dev_list);
 324
 325 struct flow_indr_dev {
 326         struct list_head                list;
 327         flow_indr_block_bind_cb_t       *cb;
 328         void                            *cb_priv;
 329         refcount_t                      refcnt;
 330         struct rcu_head                 rcu;
 331 };
 332
 333 static struct flow_indr_dev *flow_indr_dev_alloc(flow_indr_block_bind_cb_t *cb,
 334                                                  void *cb_priv)
 335 {
 336         struct flow_indr_dev *indr_dev;
 337
 338         indr_dev = kmalloc(sizeof(*indr_dev), GFP_KERNEL);
 339         if (!indr_dev)
 340                 return NULL;
 341
 342         indr_dev->cb            = cb;
 343         indr_dev->cb_priv       = cb_priv;
 344         refcount_set(&indr_dev->refcnt, 1);
 345
 346         return indr_dev;
 347 }
 348
 349 int flow_indr_dev_register(flow_indr_block_bind_cb_t *cb, void *cb_priv)
 350 {
 351         struct flow_indr_dev *indr_dev;
 352
 353         mutex_lock(&flow_indr_block_lock);
 354         list_for_each_entry(indr_dev, &flow_block_indr_dev_list, list) {
 355                 if (indr_dev->cb == cb &&
 356                     indr_dev->cb_priv == cb_priv) {
 357                         refcount_inc(&indr_dev->refcnt);
 358                         mutex_unlock(&flow_indr_block_lock);
 359                         return 0;
 360                 }
 361         }
 362
 363         indr_dev = flow_indr_dev_alloc(cb, cb_priv);
 364         if (!indr_dev) {
 365                 mutex_unlock(&flow_indr_block_lock);
 366                 return -ENOMEM;
 367         }
 368
 369         list_add(&indr_dev->list, &flow_block_indr_dev_list);
 370         mutex_unlock(&flow_indr_block_lock);
 371
 372         return 0;
 373 }
 374 EXPORT_SYMBOL(flow_indr_dev_register);
 375
 376 static void __flow_block_indr_cleanup(void (*release)(void *cb_priv),
 377                                       void *cb_priv,
 378                                       struct list_head *cleanup_list)
 379 {
 380         struct flow_block_cb *this, *next;
 381
 382         list_for_each_entry_safe(this, next, &flow_block_indr_list, indr.list) {
 383                 if (this->release == release &&
 384                     this->indr.cb_priv == cb_priv) {
 385                         list_move(&this->indr.list, cleanup_list);
 386                         return;
 387                 }
 388         }
 389 }
 390
 391 static void flow_block_indr_notify(struct list_head *cleanup_list)
 392 {
 393         struct flow_block_cb *this, *next;
 394
 395         list_for_each_entry_safe(this, next, cleanup_list, indr.list) {
 396                 list_del(&this->indr.list);
 397                 this->indr.cleanup(this);
 398         }
 399 }
 400
 401 void flow_indr_dev_unregister(flow_indr_block_bind_cb_t *cb, void *cb_priv,
 402                               void (*release)(void *cb_priv))
 403 {
 404         struct flow_indr_dev *this, *next, *indr_dev = NULL;
 405         LIST_HEAD(cleanup_list);
 406
 407         mutex_lock(&flow_indr_block_lock);
 408         list_for_each_entry_safe(this, next, &flow_block_indr_dev_list, list) {
 409                 if (this->cb == cb &&
 410                     this->cb_priv == cb_priv &&
 411                     refcount_dec_and_test(&this->refcnt)) {
 412                         indr_dev = this;
 413                         list_del(&indr_dev->list);
 414                         break;
 415                 }
 416         }
 417
 418         if (!indr_dev) {
 419                 mutex_unlock(&flow_indr_block_lock);
 420                 return;
 421         }
 422
 423         __flow_block_indr_cleanup(release, cb_priv, &cleanup_list);
 424         mutex_unlock(&flow_indr_block_lock);
 425
 426         flow_block_indr_notify(&cleanup_list);
 427         kfree(indr_dev);
 428 }
 429 EXPORT_SYMBOL(flow_indr_dev_unregister);
 430
 431 static void flow_block_indr_init(struct flow_block_cb *flow_block,
 432                                  struct flow_block_offload *bo,
 433                                  struct net_device *dev, struct Qdisc *sch, void *data,
 434                                  void *cb_priv,
 435                                  void (*cleanup)(struct flow_block_cb *block_cb))
 436 {
 437         flow_block->indr.binder_type = bo->binder_type;
 438         flow_block->indr.data = data;
 439         flow_block->indr.cb_priv = cb_priv;
 440         flow_block->indr.dev = dev;
 441         flow_block->indr.sch = sch;
 442         flow_block->indr.cleanup = cleanup;
 443 }
 444
 445 struct flow_block_cb *flow_indr_block_cb_alloc(flow_setup_cb_t *cb,
 446                                                void *cb_ident, void *cb_priv,
 447                                                void (*release)(void *cb_priv),
 448                                                struct flow_block_offload *bo,
 449                                                struct net_device *dev,
 450                                                struct Qdisc *sch, void *data,
 451                                                void *indr_cb_priv,
 452                                                void (*cleanup)(struct flow_block_cb *block_cb))
 453 {
 454         struct flow_block_cb *block_cb;
 455
 456         block_cb = flow_block_cb_alloc(cb, cb_ident, cb_priv, release);
 457         if (IS_ERR(block_cb))
 458                 goto out;
 459
 460         flow_block_indr_init(block_cb, bo, dev, sch, data, indr_cb_priv, cleanup);
 461         list_add(&block_cb->indr.list, &flow_block_indr_list);
 462
 463 out:
 464         return block_cb;
 465 }
 466 EXPORT_SYMBOL(flow_indr_block_cb_alloc);
 467
 468 int flow_indr_dev_setup_offload(struct net_device *dev, struct Qdisc *sch,
 469                                 enum tc_setup_type type, void *data,
 470                                 struct flow_block_offload *bo,
 471                                 void (*cleanup)(struct flow_block_cb *block_cb))
 472 {
 473         struct flow_indr_dev *this;
 474
 475         mutex_lock(&flow_indr_block_lock);
 476         list_for_each_entry(this, &flow_block_indr_dev_list, list)
 477                 this->cb(dev, sch, this->cb_priv, type, bo, data, cleanup);
 478
 479         mutex_unlock(&flow_indr_block_lock);
 480
 481         return list_empty(&bo->cb_list) ? -EOPNOTSUPP : 0;
 482 }
 483 EXPORT_SYMBOL(flow_indr_dev_setup_offload);