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, 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.cleanup = cleanup; 442 } 443 444 struct flow_block_cb *flow_indr_block_cb_alloc(flow_setup_cb_t *cb, 445 void *cb_ident, void *cb_priv, 446 void (*release)(void *cb_priv), 447 struct flow_block_offload *bo, 448 struct net_device *dev, void *data, 449 void *indr_cb_priv, 450 void (*cleanup)(struct flow_block_cb *block_cb)) 451 { 452 struct flow_block_cb *block_cb; 453 454 block_cb = flow_block_cb_alloc(cb, cb_ident, cb_priv, release); 455 if (IS_ERR(block_cb)) 456 goto out; 457 458 flow_block_indr_init(block_cb, bo, dev, data, indr_cb_priv, cleanup); 459 list_add(&block_cb->indr.list, &flow_block_indr_list); 460 461 out: 462 return block_cb; 463 } 464 EXPORT_SYMBOL(flow_indr_block_cb_alloc); 465 466 int flow_indr_dev_setup_offload(struct net_device *dev, 467 enum tc_setup_type type, void *data, 468 struct flow_block_offload *bo, 469 void (*cleanup)(struct flow_block_cb *block_cb)) 470 { 471 struct flow_indr_dev *this; 472 473 mutex_lock(&flow_indr_block_lock); 474 list_for_each_entry(this, &flow_block_indr_dev_list, list) 475 this->cb(dev, this->cb_priv, type, bo, data, cleanup); 476 477 mutex_unlock(&flow_indr_block_lock); 478 479 return list_empty(&bo->cb_list) ? -EOPNOTSUPP : 0; 480 } 481 EXPORT_SYMBOL(flow_indr_dev_setup_offload); 482