1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * net/sched/act_api.c Packet action API. 4 * 5 * Author: Jamal Hadi Salim 6 */ 7 8 #include <linux/types.h> 9 #include <linux/kernel.h> 10 #include <linux/string.h> 11 #include <linux/errno.h> 12 #include <linux/slab.h> 13 #include <linux/skbuff.h> 14 #include <linux/init.h> 15 #include <linux/kmod.h> 16 #include <linux/err.h> 17 #include <linux/module.h> 18 #include <net/net_namespace.h> 19 #include <net/sock.h> 20 #include <net/sch_generic.h> 21 #include <net/pkt_cls.h> 22 #include <net/tc_act/tc_pedit.h> 23 #include <net/act_api.h> 24 #include <net/netlink.h> 25 #include <net/flow_offload.h> 26 #include <net/tc_wrapper.h> 27 28 #ifdef CONFIG_INET 29 DEFINE_STATIC_KEY_FALSE(tcf_frag_xmit_count); 30 EXPORT_SYMBOL_GPL(tcf_frag_xmit_count); 31 #endif 32 33 int tcf_dev_queue_xmit(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb)) 34 { 35 #ifdef CONFIG_INET 36 if (static_branch_unlikely(&tcf_frag_xmit_count)) 37 return sch_frag_xmit_hook(skb, xmit); 38 #endif 39 40 return xmit(skb); 41 } 42 EXPORT_SYMBOL_GPL(tcf_dev_queue_xmit); 43 44 static void tcf_action_goto_chain_exec(const struct tc_action *a, 45 struct tcf_result *res) 46 { 47 const struct tcf_chain *chain = rcu_dereference_bh(a->goto_chain); 48 49 res->goto_tp = rcu_dereference_bh(chain->filter_chain); 50 } 51 52 static void tcf_free_cookie_rcu(struct rcu_head *p) 53 { 54 struct tc_cookie *cookie = container_of(p, struct tc_cookie, rcu); 55 56 kfree(cookie->data); 57 kfree(cookie); 58 } 59 60 static void tcf_set_action_cookie(struct tc_cookie __rcu **old_cookie, 61 struct tc_cookie *new_cookie) 62 { 63 struct tc_cookie *old; 64 65 old = xchg((__force struct tc_cookie **)old_cookie, new_cookie); 66 if (old) 67 call_rcu(&old->rcu, tcf_free_cookie_rcu); 68 } 69 70 int tcf_action_check_ctrlact(int action, struct tcf_proto *tp, 71 struct tcf_chain **newchain, 72 struct netlink_ext_ack *extack) 73 { 74 int opcode = TC_ACT_EXT_OPCODE(action), ret = -EINVAL; 75 u32 chain_index; 76 77 if (!opcode) 78 ret = action > TC_ACT_VALUE_MAX ? -EINVAL : 0; 79 else if (opcode <= TC_ACT_EXT_OPCODE_MAX || action == TC_ACT_UNSPEC) 80 ret = 0; 81 if (ret) { 82 NL_SET_ERR_MSG(extack, "invalid control action"); 83 goto end; 84 } 85 86 if (TC_ACT_EXT_CMP(action, TC_ACT_GOTO_CHAIN)) { 87 chain_index = action & TC_ACT_EXT_VAL_MASK; 88 if (!tp || !newchain) { 89 ret = -EINVAL; 90 NL_SET_ERR_MSG(extack, 91 "can't goto NULL proto/chain"); 92 goto end; 93 } 94 *newchain = tcf_chain_get_by_act(tp->chain->block, chain_index); 95 if (!*newchain) { 96 ret = -ENOMEM; 97 NL_SET_ERR_MSG(extack, 98 "can't allocate goto_chain"); 99 } 100 } 101 end: 102 return ret; 103 } 104 EXPORT_SYMBOL(tcf_action_check_ctrlact); 105 106 struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action, 107 struct tcf_chain *goto_chain) 108 { 109 a->tcfa_action = action; 110 goto_chain = rcu_replace_pointer(a->goto_chain, goto_chain, 1); 111 return goto_chain; 112 } 113 EXPORT_SYMBOL(tcf_action_set_ctrlact); 114 115 /* XXX: For standalone actions, we don't need a RCU grace period either, because 116 * actions are always connected to filters and filters are already destroyed in 117 * RCU callbacks, so after a RCU grace period actions are already disconnected 118 * from filters. Readers later can not find us. 119 */ 120 static void free_tcf(struct tc_action *p) 121 { 122 struct tcf_chain *chain = rcu_dereference_protected(p->goto_chain, 1); 123 124 free_percpu(p->cpu_bstats); 125 free_percpu(p->cpu_bstats_hw); 126 free_percpu(p->cpu_qstats); 127 128 tcf_set_action_cookie(&p->user_cookie, NULL); 129 if (chain) 130 tcf_chain_put_by_act(chain); 131 132 kfree(p); 133 } 134 135 static void offload_action_hw_count_set(struct tc_action *act, 136 u32 hw_count) 137 { 138 act->in_hw_count = hw_count; 139 } 140 141 static void offload_action_hw_count_inc(struct tc_action *act, 142 u32 hw_count) 143 { 144 act->in_hw_count += hw_count; 145 } 146 147 static void offload_action_hw_count_dec(struct tc_action *act, 148 u32 hw_count) 149 { 150 act->in_hw_count = act->in_hw_count > hw_count ? 151 act->in_hw_count - hw_count : 0; 152 } 153 154 static unsigned int tcf_offload_act_num_actions_single(struct tc_action *act) 155 { 156 if (is_tcf_pedit(act)) 157 return tcf_pedit_nkeys(act); 158 else 159 return 1; 160 } 161 162 static bool tc_act_skip_hw(u32 flags) 163 { 164 return (flags & TCA_ACT_FLAGS_SKIP_HW) ? true : false; 165 } 166 167 static bool tc_act_skip_sw(u32 flags) 168 { 169 return (flags & TCA_ACT_FLAGS_SKIP_SW) ? true : false; 170 } 171 172 /* SKIP_HW and SKIP_SW are mutually exclusive flags. */ 173 static bool tc_act_flags_valid(u32 flags) 174 { 175 flags &= TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW; 176 177 return flags ^ (TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW); 178 } 179 180 static int offload_action_init(struct flow_offload_action *fl_action, 181 struct tc_action *act, 182 enum offload_act_command cmd, 183 struct netlink_ext_ack *extack) 184 { 185 int err; 186 187 fl_action->extack = extack; 188 fl_action->command = cmd; 189 fl_action->index = act->tcfa_index; 190 fl_action->cookie = (unsigned long)act; 191 192 if (act->ops->offload_act_setup) { 193 spin_lock_bh(&act->tcfa_lock); 194 err = act->ops->offload_act_setup(act, fl_action, NULL, 195 false, extack); 196 spin_unlock_bh(&act->tcfa_lock); 197 return err; 198 } 199 200 return -EOPNOTSUPP; 201 } 202 203 static int tcf_action_offload_cmd_ex(struct flow_offload_action *fl_act, 204 u32 *hw_count) 205 { 206 int err; 207 208 err = flow_indr_dev_setup_offload(NULL, NULL, TC_SETUP_ACT, 209 fl_act, NULL, NULL); 210 if (err < 0) 211 return err; 212 213 if (hw_count) 214 *hw_count = err; 215 216 return 0; 217 } 218 219 static int tcf_action_offload_cmd_cb_ex(struct flow_offload_action *fl_act, 220 u32 *hw_count, 221 flow_indr_block_bind_cb_t *cb, 222 void *cb_priv) 223 { 224 int err; 225 226 err = cb(NULL, NULL, cb_priv, TC_SETUP_ACT, NULL, fl_act, NULL); 227 if (err < 0) 228 return err; 229 230 if (hw_count) 231 *hw_count = 1; 232 233 return 0; 234 } 235 236 static int tcf_action_offload_cmd(struct flow_offload_action *fl_act, 237 u32 *hw_count, 238 flow_indr_block_bind_cb_t *cb, 239 void *cb_priv) 240 { 241 return cb ? tcf_action_offload_cmd_cb_ex(fl_act, hw_count, 242 cb, cb_priv) : 243 tcf_action_offload_cmd_ex(fl_act, hw_count); 244 } 245 246 static int tcf_action_offload_add_ex(struct tc_action *action, 247 struct netlink_ext_ack *extack, 248 flow_indr_block_bind_cb_t *cb, 249 void *cb_priv) 250 { 251 bool skip_sw = tc_act_skip_sw(action->tcfa_flags); 252 struct tc_action *actions[TCA_ACT_MAX_PRIO] = { 253 [0] = action, 254 }; 255 struct flow_offload_action *fl_action; 256 u32 in_hw_count = 0; 257 int num, err = 0; 258 259 if (tc_act_skip_hw(action->tcfa_flags)) 260 return 0; 261 262 num = tcf_offload_act_num_actions_single(action); 263 fl_action = offload_action_alloc(num); 264 if (!fl_action) 265 return -ENOMEM; 266 267 err = offload_action_init(fl_action, action, FLOW_ACT_REPLACE, extack); 268 if (err) 269 goto fl_err; 270 271 err = tc_setup_action(&fl_action->action, actions, 0, extack); 272 if (err) { 273 NL_SET_ERR_MSG_MOD(extack, 274 "Failed to setup tc actions for offload"); 275 goto fl_err; 276 } 277 278 err = tcf_action_offload_cmd(fl_action, &in_hw_count, cb, cb_priv); 279 if (!err) 280 cb ? offload_action_hw_count_inc(action, in_hw_count) : 281 offload_action_hw_count_set(action, in_hw_count); 282 283 if (skip_sw && !tc_act_in_hw(action)) 284 err = -EINVAL; 285 286 tc_cleanup_offload_action(&fl_action->action); 287 288 fl_err: 289 kfree(fl_action); 290 291 return err; 292 } 293 294 /* offload the tc action after it is inserted */ 295 static int tcf_action_offload_add(struct tc_action *action, 296 struct netlink_ext_ack *extack) 297 { 298 return tcf_action_offload_add_ex(action, extack, NULL, NULL); 299 } 300 301 int tcf_action_update_hw_stats(struct tc_action *action) 302 { 303 struct flow_offload_action fl_act = {}; 304 int err; 305 306 err = offload_action_init(&fl_act, action, FLOW_ACT_STATS, NULL); 307 if (err) 308 return err; 309 310 err = tcf_action_offload_cmd(&fl_act, NULL, NULL, NULL); 311 if (!err) { 312 preempt_disable(); 313 tcf_action_stats_update(action, fl_act.stats.bytes, 314 fl_act.stats.pkts, 315 fl_act.stats.drops, 316 fl_act.stats.lastused, 317 true); 318 preempt_enable(); 319 action->used_hw_stats = fl_act.stats.used_hw_stats; 320 action->used_hw_stats_valid = true; 321 } else { 322 return -EOPNOTSUPP; 323 } 324 325 return 0; 326 } 327 EXPORT_SYMBOL(tcf_action_update_hw_stats); 328 329 static int tcf_action_offload_del_ex(struct tc_action *action, 330 flow_indr_block_bind_cb_t *cb, 331 void *cb_priv) 332 { 333 struct flow_offload_action fl_act = {}; 334 u32 in_hw_count = 0; 335 int err = 0; 336 337 if (!tc_act_in_hw(action)) 338 return 0; 339 340 err = offload_action_init(&fl_act, action, FLOW_ACT_DESTROY, NULL); 341 if (err) 342 return err; 343 344 err = tcf_action_offload_cmd(&fl_act, &in_hw_count, cb, cb_priv); 345 if (err < 0) 346 return err; 347 348 if (!cb && action->in_hw_count != in_hw_count) 349 return -EINVAL; 350 351 /* do not need to update hw state when deleting action */ 352 if (cb && in_hw_count) 353 offload_action_hw_count_dec(action, in_hw_count); 354 355 return 0; 356 } 357 358 static int tcf_action_offload_del(struct tc_action *action) 359 { 360 return tcf_action_offload_del_ex(action, NULL, NULL); 361 } 362 363 static void tcf_action_cleanup(struct tc_action *p) 364 { 365 tcf_action_offload_del(p); 366 if (p->ops->cleanup) 367 p->ops->cleanup(p); 368 369 gen_kill_estimator(&p->tcfa_rate_est); 370 free_tcf(p); 371 } 372 373 static int __tcf_action_put(struct tc_action *p, bool bind) 374 { 375 struct tcf_idrinfo *idrinfo = p->idrinfo; 376 377 if (refcount_dec_and_mutex_lock(&p->tcfa_refcnt, &idrinfo->lock)) { 378 if (bind) 379 atomic_dec(&p->tcfa_bindcnt); 380 idr_remove(&idrinfo->action_idr, p->tcfa_index); 381 mutex_unlock(&idrinfo->lock); 382 383 tcf_action_cleanup(p); 384 return 1; 385 } 386 387 if (bind) 388 atomic_dec(&p->tcfa_bindcnt); 389 390 return 0; 391 } 392 393 static int __tcf_idr_release(struct tc_action *p, bool bind, bool strict) 394 { 395 int ret = 0; 396 397 /* Release with strict==1 and bind==0 is only called through act API 398 * interface (classifiers always bind). Only case when action with 399 * positive reference count and zero bind count can exist is when it was 400 * also created with act API (unbinding last classifier will destroy the 401 * action if it was created by classifier). So only case when bind count 402 * can be changed after initial check is when unbound action is 403 * destroyed by act API while classifier binds to action with same id 404 * concurrently. This result either creation of new action(same behavior 405 * as before), or reusing existing action if concurrent process 406 * increments reference count before action is deleted. Both scenarios 407 * are acceptable. 408 */ 409 if (p) { 410 if (!bind && strict && atomic_read(&p->tcfa_bindcnt) > 0) 411 return -EPERM; 412 413 if (__tcf_action_put(p, bind)) 414 ret = ACT_P_DELETED; 415 } 416 417 return ret; 418 } 419 420 int tcf_idr_release(struct tc_action *a, bool bind) 421 { 422 const struct tc_action_ops *ops = a->ops; 423 int ret; 424 425 ret = __tcf_idr_release(a, bind, false); 426 if (ret == ACT_P_DELETED) 427 module_put(ops->owner); 428 return ret; 429 } 430 EXPORT_SYMBOL(tcf_idr_release); 431 432 static size_t tcf_action_shared_attrs_size(const struct tc_action *act) 433 { 434 struct tc_cookie *user_cookie; 435 u32 cookie_len = 0; 436 437 rcu_read_lock(); 438 user_cookie = rcu_dereference(act->user_cookie); 439 440 if (user_cookie) 441 cookie_len = nla_total_size(user_cookie->len); 442 rcu_read_unlock(); 443 444 return nla_total_size(0) /* action number nested */ 445 + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */ 446 + cookie_len /* TCA_ACT_COOKIE */ 447 + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_HW_STATS */ 448 + nla_total_size(0) /* TCA_ACT_STATS nested */ 449 + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_FLAGS */ 450 /* TCA_STATS_BASIC */ 451 + nla_total_size_64bit(sizeof(struct gnet_stats_basic)) 452 /* TCA_STATS_PKT64 */ 453 + nla_total_size_64bit(sizeof(u64)) 454 /* TCA_STATS_QUEUE */ 455 + nla_total_size_64bit(sizeof(struct gnet_stats_queue)) 456 + nla_total_size(0) /* TCA_ACT_OPTIONS nested */ 457 + nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */ 458 } 459 460 static size_t tcf_action_full_attrs_size(size_t sz) 461 { 462 return NLMSG_HDRLEN /* struct nlmsghdr */ 463 + sizeof(struct tcamsg) 464 + nla_total_size(0) /* TCA_ACT_TAB nested */ 465 + sz; 466 } 467 468 static size_t tcf_action_fill_size(const struct tc_action *act) 469 { 470 size_t sz = tcf_action_shared_attrs_size(act); 471 472 if (act->ops->get_fill_size) 473 return act->ops->get_fill_size(act) + sz; 474 return sz; 475 } 476 477 static int 478 tcf_action_dump_terse(struct sk_buff *skb, struct tc_action *a, bool from_act) 479 { 480 unsigned char *b = skb_tail_pointer(skb); 481 struct tc_cookie *cookie; 482 483 if (nla_put_string(skb, TCA_ACT_KIND, a->ops->kind)) 484 goto nla_put_failure; 485 if (tcf_action_copy_stats(skb, a, 0)) 486 goto nla_put_failure; 487 if (from_act && nla_put_u32(skb, TCA_ACT_INDEX, a->tcfa_index)) 488 goto nla_put_failure; 489 490 rcu_read_lock(); 491 cookie = rcu_dereference(a->user_cookie); 492 if (cookie) { 493 if (nla_put(skb, TCA_ACT_COOKIE, cookie->len, cookie->data)) { 494 rcu_read_unlock(); 495 goto nla_put_failure; 496 } 497 } 498 rcu_read_unlock(); 499 500 return 0; 501 502 nla_put_failure: 503 nlmsg_trim(skb, b); 504 return -1; 505 } 506 507 static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb, 508 struct netlink_callback *cb) 509 { 510 int err = 0, index = -1, s_i = 0, n_i = 0; 511 u32 act_flags = cb->args[2]; 512 unsigned long jiffy_since = cb->args[3]; 513 struct nlattr *nest; 514 struct idr *idr = &idrinfo->action_idr; 515 struct tc_action *p; 516 unsigned long id = 1; 517 unsigned long tmp; 518 519 mutex_lock(&idrinfo->lock); 520 521 s_i = cb->args[0]; 522 523 idr_for_each_entry_ul(idr, p, tmp, id) { 524 index++; 525 if (index < s_i) 526 continue; 527 if (IS_ERR(p)) 528 continue; 529 530 if (jiffy_since && 531 time_after(jiffy_since, 532 (unsigned long)p->tcfa_tm.lastuse)) 533 continue; 534 535 tcf_action_update_hw_stats(p); 536 537 nest = nla_nest_start_noflag(skb, n_i); 538 if (!nest) { 539 index--; 540 goto nla_put_failure; 541 } 542 err = (act_flags & TCA_ACT_FLAG_TERSE_DUMP) ? 543 tcf_action_dump_terse(skb, p, true) : 544 tcf_action_dump_1(skb, p, 0, 0); 545 if (err < 0) { 546 index--; 547 nlmsg_trim(skb, nest); 548 goto done; 549 } 550 nla_nest_end(skb, nest); 551 n_i++; 552 if (!(act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON) && 553 n_i >= TCA_ACT_MAX_PRIO) 554 goto done; 555 } 556 done: 557 if (index >= 0) 558 cb->args[0] = index + 1; 559 560 mutex_unlock(&idrinfo->lock); 561 if (n_i) { 562 if (act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON) 563 cb->args[1] = n_i; 564 } 565 return n_i; 566 567 nla_put_failure: 568 nla_nest_cancel(skb, nest); 569 goto done; 570 } 571 572 static int tcf_idr_release_unsafe(struct tc_action *p) 573 { 574 if (atomic_read(&p->tcfa_bindcnt) > 0) 575 return -EPERM; 576 577 if (refcount_dec_and_test(&p->tcfa_refcnt)) { 578 idr_remove(&p->idrinfo->action_idr, p->tcfa_index); 579 tcf_action_cleanup(p); 580 return ACT_P_DELETED; 581 } 582 583 return 0; 584 } 585 586 static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb, 587 const struct tc_action_ops *ops, 588 struct netlink_ext_ack *extack) 589 { 590 struct nlattr *nest; 591 int n_i = 0; 592 int ret = -EINVAL; 593 struct idr *idr = &idrinfo->action_idr; 594 struct tc_action *p; 595 unsigned long id = 1; 596 unsigned long tmp; 597 598 nest = nla_nest_start_noflag(skb, 0); 599 if (nest == NULL) 600 goto nla_put_failure; 601 if (nla_put_string(skb, TCA_ACT_KIND, ops->kind)) 602 goto nla_put_failure; 603 604 ret = 0; 605 mutex_lock(&idrinfo->lock); 606 idr_for_each_entry_ul(idr, p, tmp, id) { 607 if (IS_ERR(p)) 608 continue; 609 ret = tcf_idr_release_unsafe(p); 610 if (ret == ACT_P_DELETED) 611 module_put(ops->owner); 612 else if (ret < 0) 613 break; 614 n_i++; 615 } 616 mutex_unlock(&idrinfo->lock); 617 if (ret < 0) { 618 if (n_i) 619 NL_SET_ERR_MSG(extack, "Unable to flush all TC actions"); 620 else 621 goto nla_put_failure; 622 } 623 624 ret = nla_put_u32(skb, TCA_FCNT, n_i); 625 if (ret) 626 goto nla_put_failure; 627 nla_nest_end(skb, nest); 628 629 return n_i; 630 nla_put_failure: 631 nla_nest_cancel(skb, nest); 632 return ret; 633 } 634 635 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb, 636 struct netlink_callback *cb, int type, 637 const struct tc_action_ops *ops, 638 struct netlink_ext_ack *extack) 639 { 640 struct tcf_idrinfo *idrinfo = tn->idrinfo; 641 642 if (type == RTM_DELACTION) { 643 return tcf_del_walker(idrinfo, skb, ops, extack); 644 } else if (type == RTM_GETACTION) { 645 return tcf_dump_walker(idrinfo, skb, cb); 646 } else { 647 WARN(1, "tcf_generic_walker: unknown command %d\n", type); 648 NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command"); 649 return -EINVAL; 650 } 651 } 652 EXPORT_SYMBOL(tcf_generic_walker); 653 654 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index) 655 { 656 struct tcf_idrinfo *idrinfo = tn->idrinfo; 657 struct tc_action *p; 658 659 mutex_lock(&idrinfo->lock); 660 p = idr_find(&idrinfo->action_idr, index); 661 if (IS_ERR(p)) 662 p = NULL; 663 else if (p) 664 refcount_inc(&p->tcfa_refcnt); 665 mutex_unlock(&idrinfo->lock); 666 667 if (p) { 668 *a = p; 669 return true; 670 } 671 return false; 672 } 673 EXPORT_SYMBOL(tcf_idr_search); 674 675 static int __tcf_generic_walker(struct net *net, struct sk_buff *skb, 676 struct netlink_callback *cb, int type, 677 const struct tc_action_ops *ops, 678 struct netlink_ext_ack *extack) 679 { 680 struct tc_action_net *tn = net_generic(net, ops->net_id); 681 682 if (unlikely(ops->walk)) 683 return ops->walk(net, skb, cb, type, ops, extack); 684 685 return tcf_generic_walker(tn, skb, cb, type, ops, extack); 686 } 687 688 static int __tcf_idr_search(struct net *net, 689 const struct tc_action_ops *ops, 690 struct tc_action **a, u32 index) 691 { 692 struct tc_action_net *tn = net_generic(net, ops->net_id); 693 694 if (unlikely(ops->lookup)) 695 return ops->lookup(net, a, index); 696 697 return tcf_idr_search(tn, a, index); 698 } 699 700 static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index) 701 { 702 struct tc_action *p; 703 int ret = 0; 704 705 mutex_lock(&idrinfo->lock); 706 p = idr_find(&idrinfo->action_idr, index); 707 if (!p) { 708 mutex_unlock(&idrinfo->lock); 709 return -ENOENT; 710 } 711 712 if (!atomic_read(&p->tcfa_bindcnt)) { 713 if (refcount_dec_and_test(&p->tcfa_refcnt)) { 714 struct module *owner = p->ops->owner; 715 716 WARN_ON(p != idr_remove(&idrinfo->action_idr, 717 p->tcfa_index)); 718 mutex_unlock(&idrinfo->lock); 719 720 tcf_action_cleanup(p); 721 module_put(owner); 722 return 0; 723 } 724 ret = 0; 725 } else { 726 ret = -EPERM; 727 } 728 729 mutex_unlock(&idrinfo->lock); 730 return ret; 731 } 732 733 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est, 734 struct tc_action **a, const struct tc_action_ops *ops, 735 int bind, bool cpustats, u32 flags) 736 { 737 struct tc_action *p = kzalloc(ops->size, GFP_KERNEL); 738 struct tcf_idrinfo *idrinfo = tn->idrinfo; 739 int err = -ENOMEM; 740 741 if (unlikely(!p)) 742 return -ENOMEM; 743 refcount_set(&p->tcfa_refcnt, 1); 744 if (bind) 745 atomic_set(&p->tcfa_bindcnt, 1); 746 747 if (cpustats) { 748 p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync); 749 if (!p->cpu_bstats) 750 goto err1; 751 p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync); 752 if (!p->cpu_bstats_hw) 753 goto err2; 754 p->cpu_qstats = alloc_percpu(struct gnet_stats_queue); 755 if (!p->cpu_qstats) 756 goto err3; 757 } 758 gnet_stats_basic_sync_init(&p->tcfa_bstats); 759 gnet_stats_basic_sync_init(&p->tcfa_bstats_hw); 760 spin_lock_init(&p->tcfa_lock); 761 p->tcfa_index = index; 762 p->tcfa_tm.install = jiffies; 763 p->tcfa_tm.lastuse = jiffies; 764 p->tcfa_tm.firstuse = 0; 765 p->tcfa_flags = flags; 766 if (est) { 767 err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats, 768 &p->tcfa_rate_est, 769 &p->tcfa_lock, false, est); 770 if (err) 771 goto err4; 772 } 773 774 p->idrinfo = idrinfo; 775 __module_get(ops->owner); 776 p->ops = ops; 777 *a = p; 778 return 0; 779 err4: 780 free_percpu(p->cpu_qstats); 781 err3: 782 free_percpu(p->cpu_bstats_hw); 783 err2: 784 free_percpu(p->cpu_bstats); 785 err1: 786 kfree(p); 787 return err; 788 } 789 EXPORT_SYMBOL(tcf_idr_create); 790 791 int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index, 792 struct nlattr *est, struct tc_action **a, 793 const struct tc_action_ops *ops, int bind, 794 u32 flags) 795 { 796 /* Set cpustats according to actions flags. */ 797 return tcf_idr_create(tn, index, est, a, ops, bind, 798 !(flags & TCA_ACT_FLAGS_NO_PERCPU_STATS), flags); 799 } 800 EXPORT_SYMBOL(tcf_idr_create_from_flags); 801 802 /* Cleanup idr index that was allocated but not initialized. */ 803 804 void tcf_idr_cleanup(struct tc_action_net *tn, u32 index) 805 { 806 struct tcf_idrinfo *idrinfo = tn->idrinfo; 807 808 mutex_lock(&idrinfo->lock); 809 /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */ 810 WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index))); 811 mutex_unlock(&idrinfo->lock); 812 } 813 EXPORT_SYMBOL(tcf_idr_cleanup); 814 815 /* Check if action with specified index exists. If actions is found, increments 816 * its reference and bind counters, and return 1. Otherwise insert temporary 817 * error pointer (to prevent concurrent users from inserting actions with same 818 * index) and return 0. 819 * 820 * May return -EAGAIN for binding actions in case of a parallel add/delete on 821 * the requested index. 822 */ 823 824 int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index, 825 struct tc_action **a, int bind) 826 { 827 struct tcf_idrinfo *idrinfo = tn->idrinfo; 828 struct tc_action *p; 829 int ret; 830 u32 max; 831 832 if (*index) { 833 again: 834 rcu_read_lock(); 835 p = idr_find(&idrinfo->action_idr, *index); 836 837 if (IS_ERR(p)) { 838 /* This means that another process allocated 839 * index but did not assign the pointer yet. 840 */ 841 rcu_read_unlock(); 842 goto again; 843 } 844 845 if (!p) { 846 /* Empty slot, try to allocate it */ 847 max = *index; 848 rcu_read_unlock(); 849 goto new; 850 } 851 852 if (!refcount_inc_not_zero(&p->tcfa_refcnt)) { 853 /* Action was deleted in parallel */ 854 rcu_read_unlock(); 855 return -EAGAIN; 856 } 857 858 if (bind) 859 atomic_inc(&p->tcfa_bindcnt); 860 *a = p; 861 862 rcu_read_unlock(); 863 864 return 1; 865 } else { 866 /* Find a slot */ 867 *index = 1; 868 max = UINT_MAX; 869 } 870 871 new: 872 *a = NULL; 873 874 mutex_lock(&idrinfo->lock); 875 ret = idr_alloc_u32(&idrinfo->action_idr, ERR_PTR(-EBUSY), index, max, 876 GFP_KERNEL); 877 mutex_unlock(&idrinfo->lock); 878 879 /* N binds raced for action allocation, 880 * retry for all the ones that failed. 881 */ 882 if (ret == -ENOSPC && *index == max) 883 ret = -EAGAIN; 884 885 return ret; 886 } 887 EXPORT_SYMBOL(tcf_idr_check_alloc); 888 889 void tcf_idrinfo_destroy(const struct tc_action_ops *ops, 890 struct tcf_idrinfo *idrinfo) 891 { 892 struct idr *idr = &idrinfo->action_idr; 893 struct tc_action *p; 894 int ret; 895 unsigned long id = 1; 896 unsigned long tmp; 897 898 idr_for_each_entry_ul(idr, p, tmp, id) { 899 ret = __tcf_idr_release(p, false, true); 900 if (ret == ACT_P_DELETED) 901 module_put(ops->owner); 902 else if (ret < 0) 903 return; 904 } 905 idr_destroy(&idrinfo->action_idr); 906 } 907 EXPORT_SYMBOL(tcf_idrinfo_destroy); 908 909 static LIST_HEAD(act_base); 910 static DEFINE_RWLOCK(act_mod_lock); 911 /* since act ops id is stored in pernet subsystem list, 912 * then there is no way to walk through only all the action 913 * subsystem, so we keep tc action pernet ops id for 914 * reoffload to walk through. 915 */ 916 static LIST_HEAD(act_pernet_id_list); 917 static DEFINE_MUTEX(act_id_mutex); 918 struct tc_act_pernet_id { 919 struct list_head list; 920 unsigned int id; 921 }; 922 923 static int tcf_pernet_add_id_list(unsigned int id) 924 { 925 struct tc_act_pernet_id *id_ptr; 926 int ret = 0; 927 928 mutex_lock(&act_id_mutex); 929 list_for_each_entry(id_ptr, &act_pernet_id_list, list) { 930 if (id_ptr->id == id) { 931 ret = -EEXIST; 932 goto err_out; 933 } 934 } 935 936 id_ptr = kzalloc(sizeof(*id_ptr), GFP_KERNEL); 937 if (!id_ptr) { 938 ret = -ENOMEM; 939 goto err_out; 940 } 941 id_ptr->id = id; 942 943 list_add_tail(&id_ptr->list, &act_pernet_id_list); 944 945 err_out: 946 mutex_unlock(&act_id_mutex); 947 return ret; 948 } 949 950 static void tcf_pernet_del_id_list(unsigned int id) 951 { 952 struct tc_act_pernet_id *id_ptr; 953 954 mutex_lock(&act_id_mutex); 955 list_for_each_entry(id_ptr, &act_pernet_id_list, list) { 956 if (id_ptr->id == id) { 957 list_del(&id_ptr->list); 958 kfree(id_ptr); 959 break; 960 } 961 } 962 mutex_unlock(&act_id_mutex); 963 } 964 965 int tcf_register_action(struct tc_action_ops *act, 966 struct pernet_operations *ops) 967 { 968 struct tc_action_ops *a; 969 int ret; 970 971 if (!act->act || !act->dump || !act->init) 972 return -EINVAL; 973 974 /* We have to register pernet ops before making the action ops visible, 975 * otherwise tcf_action_init_1() could get a partially initialized 976 * netns. 977 */ 978 ret = register_pernet_subsys(ops); 979 if (ret) 980 return ret; 981 982 if (ops->id) { 983 ret = tcf_pernet_add_id_list(*ops->id); 984 if (ret) 985 goto err_id; 986 } 987 988 write_lock(&act_mod_lock); 989 list_for_each_entry(a, &act_base, head) { 990 if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) { 991 ret = -EEXIST; 992 goto err_out; 993 } 994 } 995 list_add_tail(&act->head, &act_base); 996 write_unlock(&act_mod_lock); 997 998 return 0; 999 1000 err_out: 1001 write_unlock(&act_mod_lock); 1002 if (ops->id) 1003 tcf_pernet_del_id_list(*ops->id); 1004 err_id: 1005 unregister_pernet_subsys(ops); 1006 return ret; 1007 } 1008 EXPORT_SYMBOL(tcf_register_action); 1009 1010 int tcf_unregister_action(struct tc_action_ops *act, 1011 struct pernet_operations *ops) 1012 { 1013 struct tc_action_ops *a; 1014 int err = -ENOENT; 1015 1016 write_lock(&act_mod_lock); 1017 list_for_each_entry(a, &act_base, head) { 1018 if (a == act) { 1019 list_del(&act->head); 1020 err = 0; 1021 break; 1022 } 1023 } 1024 write_unlock(&act_mod_lock); 1025 if (!err) { 1026 unregister_pernet_subsys(ops); 1027 if (ops->id) 1028 tcf_pernet_del_id_list(*ops->id); 1029 } 1030 return err; 1031 } 1032 EXPORT_SYMBOL(tcf_unregister_action); 1033 1034 /* lookup by name */ 1035 static struct tc_action_ops *tc_lookup_action_n(char *kind) 1036 { 1037 struct tc_action_ops *a, *res = NULL; 1038 1039 if (kind) { 1040 read_lock(&act_mod_lock); 1041 list_for_each_entry(a, &act_base, head) { 1042 if (strcmp(kind, a->kind) == 0) { 1043 if (try_module_get(a->owner)) 1044 res = a; 1045 break; 1046 } 1047 } 1048 read_unlock(&act_mod_lock); 1049 } 1050 return res; 1051 } 1052 1053 /* lookup by nlattr */ 1054 static struct tc_action_ops *tc_lookup_action(struct nlattr *kind) 1055 { 1056 struct tc_action_ops *a, *res = NULL; 1057 1058 if (kind) { 1059 read_lock(&act_mod_lock); 1060 list_for_each_entry(a, &act_base, head) { 1061 if (nla_strcmp(kind, a->kind) == 0) { 1062 if (try_module_get(a->owner)) 1063 res = a; 1064 break; 1065 } 1066 } 1067 read_unlock(&act_mod_lock); 1068 } 1069 return res; 1070 } 1071 1072 /*TCA_ACT_MAX_PRIO is 32, there count up to 32 */ 1073 #define TCA_ACT_MAX_PRIO_MASK 0x1FF 1074 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions, 1075 int nr_actions, struct tcf_result *res) 1076 { 1077 u32 jmp_prgcnt = 0; 1078 u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */ 1079 int i; 1080 int ret = TC_ACT_OK; 1081 1082 if (skb_skip_tc_classify(skb)) 1083 return TC_ACT_OK; 1084 1085 restart_act_graph: 1086 for (i = 0; i < nr_actions; i++) { 1087 const struct tc_action *a = actions[i]; 1088 int repeat_ttl; 1089 1090 if (jmp_prgcnt > 0) { 1091 jmp_prgcnt -= 1; 1092 continue; 1093 } 1094 1095 if (tc_act_skip_sw(a->tcfa_flags)) 1096 continue; 1097 1098 repeat_ttl = 32; 1099 repeat: 1100 ret = tc_act(skb, a, res); 1101 if (unlikely(ret == TC_ACT_REPEAT)) { 1102 if (--repeat_ttl != 0) 1103 goto repeat; 1104 /* suspicious opcode, stop pipeline */ 1105 net_warn_ratelimited("TC_ACT_REPEAT abuse ?\n"); 1106 return TC_ACT_OK; 1107 } 1108 if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) { 1109 jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK; 1110 if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) { 1111 /* faulty opcode, stop pipeline */ 1112 return TC_ACT_OK; 1113 } else { 1114 jmp_ttl -= 1; 1115 if (jmp_ttl > 0) 1116 goto restart_act_graph; 1117 else /* faulty graph, stop pipeline */ 1118 return TC_ACT_OK; 1119 } 1120 } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) { 1121 if (unlikely(!rcu_access_pointer(a->goto_chain))) { 1122 tcf_set_drop_reason(skb, 1123 SKB_DROP_REASON_TC_CHAIN_NOTFOUND); 1124 return TC_ACT_SHOT; 1125 } 1126 tcf_action_goto_chain_exec(a, res); 1127 } 1128 1129 if (ret != TC_ACT_PIPE) 1130 break; 1131 } 1132 1133 return ret; 1134 } 1135 EXPORT_SYMBOL(tcf_action_exec); 1136 1137 int tcf_action_destroy(struct tc_action *actions[], int bind) 1138 { 1139 const struct tc_action_ops *ops; 1140 struct tc_action *a; 1141 int ret = 0, i; 1142 1143 tcf_act_for_each_action(i, a, actions) { 1144 actions[i] = NULL; 1145 ops = a->ops; 1146 ret = __tcf_idr_release(a, bind, true); 1147 if (ret == ACT_P_DELETED) 1148 module_put(ops->owner); 1149 else if (ret < 0) 1150 return ret; 1151 } 1152 return ret; 1153 } 1154 1155 static int tcf_action_put(struct tc_action *p) 1156 { 1157 return __tcf_action_put(p, false); 1158 } 1159 1160 static void tcf_action_put_many(struct tc_action *actions[]) 1161 { 1162 struct tc_action *a; 1163 int i; 1164 1165 tcf_act_for_each_action(i, a, actions) { 1166 const struct tc_action_ops *ops = a->ops; 1167 if (tcf_action_put(a)) 1168 module_put(ops->owner); 1169 } 1170 } 1171 1172 static void tca_put_bound_many(struct tc_action *actions[], int init_res[]) 1173 { 1174 struct tc_action *a; 1175 int i; 1176 1177 tcf_act_for_each_action(i, a, actions) { 1178 const struct tc_action_ops *ops = a->ops; 1179 1180 if (init_res[i] == ACT_P_CREATED) 1181 continue; 1182 1183 if (tcf_action_put(a)) 1184 module_put(ops->owner); 1185 } 1186 } 1187 1188 int 1189 tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) 1190 { 1191 return a->ops->dump(skb, a, bind, ref); 1192 } 1193 1194 int 1195 tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) 1196 { 1197 int err = -EINVAL; 1198 unsigned char *b = skb_tail_pointer(skb); 1199 struct nlattr *nest; 1200 u32 flags; 1201 1202 if (tcf_action_dump_terse(skb, a, false)) 1203 goto nla_put_failure; 1204 1205 if (a->hw_stats != TCA_ACT_HW_STATS_ANY && 1206 nla_put_bitfield32(skb, TCA_ACT_HW_STATS, 1207 a->hw_stats, TCA_ACT_HW_STATS_ANY)) 1208 goto nla_put_failure; 1209 1210 if (a->used_hw_stats_valid && 1211 nla_put_bitfield32(skb, TCA_ACT_USED_HW_STATS, 1212 a->used_hw_stats, TCA_ACT_HW_STATS_ANY)) 1213 goto nla_put_failure; 1214 1215 flags = a->tcfa_flags & TCA_ACT_FLAGS_USER_MASK; 1216 if (flags && 1217 nla_put_bitfield32(skb, TCA_ACT_FLAGS, 1218 flags, flags)) 1219 goto nla_put_failure; 1220 1221 if (nla_put_u32(skb, TCA_ACT_IN_HW_COUNT, a->in_hw_count)) 1222 goto nla_put_failure; 1223 1224 nest = nla_nest_start_noflag(skb, TCA_ACT_OPTIONS); 1225 if (nest == NULL) 1226 goto nla_put_failure; 1227 err = tcf_action_dump_old(skb, a, bind, ref); 1228 if (err > 0) { 1229 nla_nest_end(skb, nest); 1230 return err; 1231 } 1232 1233 nla_put_failure: 1234 nlmsg_trim(skb, b); 1235 return -1; 1236 } 1237 EXPORT_SYMBOL(tcf_action_dump_1); 1238 1239 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], 1240 int bind, int ref, bool terse) 1241 { 1242 struct tc_action *a; 1243 int err = -EINVAL, i; 1244 struct nlattr *nest; 1245 1246 tcf_act_for_each_action(i, a, actions) { 1247 nest = nla_nest_start_noflag(skb, i + 1); 1248 if (nest == NULL) 1249 goto nla_put_failure; 1250 err = terse ? tcf_action_dump_terse(skb, a, false) : 1251 tcf_action_dump_1(skb, a, bind, ref); 1252 if (err < 0) 1253 goto errout; 1254 nla_nest_end(skb, nest); 1255 } 1256 1257 return 0; 1258 1259 nla_put_failure: 1260 err = -EINVAL; 1261 errout: 1262 nla_nest_cancel(skb, nest); 1263 return err; 1264 } 1265 1266 static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb) 1267 { 1268 struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL); 1269 if (!c) 1270 return NULL; 1271 1272 c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL); 1273 if (!c->data) { 1274 kfree(c); 1275 return NULL; 1276 } 1277 c->len = nla_len(tb[TCA_ACT_COOKIE]); 1278 1279 return c; 1280 } 1281 1282 static u8 tcf_action_hw_stats_get(struct nlattr *hw_stats_attr) 1283 { 1284 struct nla_bitfield32 hw_stats_bf; 1285 1286 /* If the user did not pass the attr, that means he does 1287 * not care about the type. Return "any" in that case 1288 * which is setting on all supported types. 1289 */ 1290 if (!hw_stats_attr) 1291 return TCA_ACT_HW_STATS_ANY; 1292 hw_stats_bf = nla_get_bitfield32(hw_stats_attr); 1293 return hw_stats_bf.value; 1294 } 1295 1296 static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = { 1297 [TCA_ACT_KIND] = { .type = NLA_STRING }, 1298 [TCA_ACT_INDEX] = { .type = NLA_U32 }, 1299 [TCA_ACT_COOKIE] = { .type = NLA_BINARY, 1300 .len = TC_COOKIE_MAX_SIZE }, 1301 [TCA_ACT_OPTIONS] = { .type = NLA_NESTED }, 1302 [TCA_ACT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAGS_NO_PERCPU_STATS | 1303 TCA_ACT_FLAGS_SKIP_HW | 1304 TCA_ACT_FLAGS_SKIP_SW), 1305 [TCA_ACT_HW_STATS] = NLA_POLICY_BITFIELD32(TCA_ACT_HW_STATS_ANY), 1306 }; 1307 1308 void tcf_idr_insert_many(struct tc_action *actions[], int init_res[]) 1309 { 1310 struct tc_action *a; 1311 int i; 1312 1313 tcf_act_for_each_action(i, a, actions) { 1314 struct tcf_idrinfo *idrinfo; 1315 1316 if (init_res[i] == ACT_P_BOUND) 1317 continue; 1318 1319 idrinfo = a->idrinfo; 1320 mutex_lock(&idrinfo->lock); 1321 /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */ 1322 idr_replace(&idrinfo->action_idr, a, a->tcfa_index); 1323 mutex_unlock(&idrinfo->lock); 1324 } 1325 } 1326 1327 struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, u32 flags, 1328 struct netlink_ext_ack *extack) 1329 { 1330 bool police = flags & TCA_ACT_FLAGS_POLICE; 1331 struct nlattr *tb[TCA_ACT_MAX + 1]; 1332 struct tc_action_ops *a_o; 1333 char act_name[IFNAMSIZ]; 1334 struct nlattr *kind; 1335 int err; 1336 1337 if (!police) { 1338 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, 1339 tcf_action_policy, extack); 1340 if (err < 0) 1341 return ERR_PTR(err); 1342 err = -EINVAL; 1343 kind = tb[TCA_ACT_KIND]; 1344 if (!kind) { 1345 NL_SET_ERR_MSG(extack, "TC action kind must be specified"); 1346 return ERR_PTR(err); 1347 } 1348 if (nla_strscpy(act_name, kind, IFNAMSIZ) < 0) { 1349 NL_SET_ERR_MSG(extack, "TC action name too long"); 1350 return ERR_PTR(err); 1351 } 1352 } else { 1353 if (strscpy(act_name, "police", IFNAMSIZ) < 0) { 1354 NL_SET_ERR_MSG(extack, "TC action name too long"); 1355 return ERR_PTR(-EINVAL); 1356 } 1357 } 1358 1359 a_o = tc_lookup_action_n(act_name); 1360 if (a_o == NULL) { 1361 #ifdef CONFIG_MODULES 1362 bool rtnl_held = !(flags & TCA_ACT_FLAGS_NO_RTNL); 1363 1364 if (rtnl_held) 1365 rtnl_unlock(); 1366 request_module("act_%s", act_name); 1367 if (rtnl_held) 1368 rtnl_lock(); 1369 1370 a_o = tc_lookup_action_n(act_name); 1371 1372 /* We dropped the RTNL semaphore in order to 1373 * perform the module load. So, even if we 1374 * succeeded in loading the module we have to 1375 * tell the caller to replay the request. We 1376 * indicate this using -EAGAIN. 1377 */ 1378 if (a_o != NULL) { 1379 module_put(a_o->owner); 1380 return ERR_PTR(-EAGAIN); 1381 } 1382 #endif 1383 NL_SET_ERR_MSG(extack, "Failed to load TC action module"); 1384 return ERR_PTR(-ENOENT); 1385 } 1386 1387 return a_o; 1388 } 1389 1390 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp, 1391 struct nlattr *nla, struct nlattr *est, 1392 struct tc_action_ops *a_o, int *init_res, 1393 u32 flags, struct netlink_ext_ack *extack) 1394 { 1395 bool police = flags & TCA_ACT_FLAGS_POLICE; 1396 struct nla_bitfield32 userflags = { 0, 0 }; 1397 struct tc_cookie *user_cookie = NULL; 1398 u8 hw_stats = TCA_ACT_HW_STATS_ANY; 1399 struct nlattr *tb[TCA_ACT_MAX + 1]; 1400 struct tc_action *a; 1401 int err; 1402 1403 /* backward compatibility for policer */ 1404 if (!police) { 1405 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, 1406 tcf_action_policy, extack); 1407 if (err < 0) 1408 return ERR_PTR(err); 1409 if (tb[TCA_ACT_COOKIE]) { 1410 user_cookie = nla_memdup_cookie(tb); 1411 if (!user_cookie) { 1412 NL_SET_ERR_MSG(extack, "No memory to generate TC cookie"); 1413 err = -ENOMEM; 1414 goto err_out; 1415 } 1416 } 1417 hw_stats = tcf_action_hw_stats_get(tb[TCA_ACT_HW_STATS]); 1418 if (tb[TCA_ACT_FLAGS]) { 1419 userflags = nla_get_bitfield32(tb[TCA_ACT_FLAGS]); 1420 if (!tc_act_flags_valid(userflags.value)) { 1421 err = -EINVAL; 1422 goto err_out; 1423 } 1424 } 1425 1426 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, tp, 1427 userflags.value | flags, extack); 1428 } else { 1429 err = a_o->init(net, nla, est, &a, tp, userflags.value | flags, 1430 extack); 1431 } 1432 if (err < 0) 1433 goto err_out; 1434 *init_res = err; 1435 1436 if (!police && tb[TCA_ACT_COOKIE]) 1437 tcf_set_action_cookie(&a->user_cookie, user_cookie); 1438 1439 if (!police) 1440 a->hw_stats = hw_stats; 1441 1442 return a; 1443 1444 err_out: 1445 if (user_cookie) { 1446 kfree(user_cookie->data); 1447 kfree(user_cookie); 1448 } 1449 return ERR_PTR(err); 1450 } 1451 1452 static bool tc_act_bind(u32 flags) 1453 { 1454 return !!(flags & TCA_ACT_FLAGS_BIND); 1455 } 1456 1457 /* Returns numbers of initialized actions or negative error. */ 1458 1459 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla, 1460 struct nlattr *est, struct tc_action *actions[], 1461 int init_res[], size_t *attr_size, 1462 u32 flags, u32 fl_flags, 1463 struct netlink_ext_ack *extack) 1464 { 1465 struct tc_action_ops *ops[TCA_ACT_MAX_PRIO] = {}; 1466 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; 1467 struct tc_action *act; 1468 size_t sz = 0; 1469 int err; 1470 int i; 1471 1472 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL, 1473 extack); 1474 if (err < 0) 1475 return err; 1476 1477 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { 1478 struct tc_action_ops *a_o; 1479 1480 a_o = tc_action_load_ops(tb[i], flags, extack); 1481 if (IS_ERR(a_o)) { 1482 err = PTR_ERR(a_o); 1483 goto err_mod; 1484 } 1485 ops[i - 1] = a_o; 1486 } 1487 1488 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { 1489 act = tcf_action_init_1(net, tp, tb[i], est, ops[i - 1], 1490 &init_res[i - 1], flags, extack); 1491 if (IS_ERR(act)) { 1492 err = PTR_ERR(act); 1493 goto err; 1494 } 1495 sz += tcf_action_fill_size(act); 1496 /* Start from index 0 */ 1497 actions[i - 1] = act; 1498 if (tc_act_bind(flags)) { 1499 bool skip_sw = tc_skip_sw(fl_flags); 1500 bool skip_hw = tc_skip_hw(fl_flags); 1501 1502 if (tc_act_bind(act->tcfa_flags)) 1503 continue; 1504 if (skip_sw != tc_act_skip_sw(act->tcfa_flags) || 1505 skip_hw != tc_act_skip_hw(act->tcfa_flags)) { 1506 NL_SET_ERR_MSG(extack, 1507 "Mismatch between action and filter offload flags"); 1508 err = -EINVAL; 1509 goto err; 1510 } 1511 } else { 1512 err = tcf_action_offload_add(act, extack); 1513 if (tc_act_skip_sw(act->tcfa_flags) && err) 1514 goto err; 1515 } 1516 } 1517 1518 /* We have to commit them all together, because if any error happened in 1519 * between, we could not handle the failure gracefully. 1520 */ 1521 tcf_idr_insert_many(actions, init_res); 1522 1523 *attr_size = tcf_action_full_attrs_size(sz); 1524 err = i - 1; 1525 goto err_mod; 1526 1527 err: 1528 tcf_action_destroy(actions, flags & TCA_ACT_FLAGS_BIND); 1529 err_mod: 1530 for (i = 0; i < TCA_ACT_MAX_PRIO && ops[i]; i++) 1531 module_put(ops[i]->owner); 1532 return err; 1533 } 1534 1535 void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets, 1536 u64 drops, bool hw) 1537 { 1538 if (a->cpu_bstats) { 1539 _bstats_update(this_cpu_ptr(a->cpu_bstats), bytes, packets); 1540 1541 this_cpu_ptr(a->cpu_qstats)->drops += drops; 1542 1543 if (hw) 1544 _bstats_update(this_cpu_ptr(a->cpu_bstats_hw), 1545 bytes, packets); 1546 return; 1547 } 1548 1549 _bstats_update(&a->tcfa_bstats, bytes, packets); 1550 a->tcfa_qstats.drops += drops; 1551 if (hw) 1552 _bstats_update(&a->tcfa_bstats_hw, bytes, packets); 1553 } 1554 EXPORT_SYMBOL(tcf_action_update_stats); 1555 1556 int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p, 1557 int compat_mode) 1558 { 1559 int err = 0; 1560 struct gnet_dump d; 1561 1562 if (p == NULL) 1563 goto errout; 1564 1565 /* compat_mode being true specifies a call that is supposed 1566 * to add additional backward compatibility statistic TLVs. 1567 */ 1568 if (compat_mode) { 1569 if (p->type == TCA_OLD_COMPAT) 1570 err = gnet_stats_start_copy_compat(skb, 0, 1571 TCA_STATS, 1572 TCA_XSTATS, 1573 &p->tcfa_lock, &d, 1574 TCA_PAD); 1575 else 1576 return 0; 1577 } else 1578 err = gnet_stats_start_copy(skb, TCA_ACT_STATS, 1579 &p->tcfa_lock, &d, TCA_ACT_PAD); 1580 1581 if (err < 0) 1582 goto errout; 1583 1584 if (gnet_stats_copy_basic(&d, p->cpu_bstats, 1585 &p->tcfa_bstats, false) < 0 || 1586 gnet_stats_copy_basic_hw(&d, p->cpu_bstats_hw, 1587 &p->tcfa_bstats_hw, false) < 0 || 1588 gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 || 1589 gnet_stats_copy_queue(&d, p->cpu_qstats, 1590 &p->tcfa_qstats, 1591 p->tcfa_qstats.qlen) < 0) 1592 goto errout; 1593 1594 if (gnet_stats_finish_copy(&d) < 0) 1595 goto errout; 1596 1597 return 0; 1598 1599 errout: 1600 return -1; 1601 } 1602 1603 static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[], 1604 u32 portid, u32 seq, u16 flags, int event, int bind, 1605 int ref, struct netlink_ext_ack *extack) 1606 { 1607 struct tcamsg *t; 1608 struct nlmsghdr *nlh; 1609 unsigned char *b = skb_tail_pointer(skb); 1610 struct nlattr *nest; 1611 1612 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags); 1613 if (!nlh) 1614 goto out_nlmsg_trim; 1615 t = nlmsg_data(nlh); 1616 t->tca_family = AF_UNSPEC; 1617 t->tca__pad1 = 0; 1618 t->tca__pad2 = 0; 1619 1620 if (extack && extack->_msg && 1621 nla_put_string(skb, TCA_ROOT_EXT_WARN_MSG, extack->_msg)) 1622 goto out_nlmsg_trim; 1623 1624 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB); 1625 if (!nest) 1626 goto out_nlmsg_trim; 1627 1628 if (tcf_action_dump(skb, actions, bind, ref, false) < 0) 1629 goto out_nlmsg_trim; 1630 1631 nla_nest_end(skb, nest); 1632 1633 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 1634 1635 return skb->len; 1636 1637 out_nlmsg_trim: 1638 nlmsg_trim(skb, b); 1639 return -1; 1640 } 1641 1642 static int 1643 tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n, 1644 struct tc_action *actions[], int event, 1645 struct netlink_ext_ack *extack) 1646 { 1647 struct sk_buff *skb; 1648 1649 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); 1650 if (!skb) 1651 return -ENOBUFS; 1652 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event, 1653 0, 1, NULL) <= 0) { 1654 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action"); 1655 kfree_skb(skb); 1656 return -EINVAL; 1657 } 1658 1659 return rtnl_unicast(skb, net, portid); 1660 } 1661 1662 static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla, 1663 struct nlmsghdr *n, u32 portid, 1664 struct netlink_ext_ack *extack) 1665 { 1666 struct nlattr *tb[TCA_ACT_MAX + 1]; 1667 const struct tc_action_ops *ops; 1668 struct tc_action *a; 1669 int index; 1670 int err; 1671 1672 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, 1673 tcf_action_policy, extack); 1674 if (err < 0) 1675 goto err_out; 1676 1677 err = -EINVAL; 1678 if (tb[TCA_ACT_INDEX] == NULL || 1679 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) { 1680 NL_SET_ERR_MSG(extack, "Invalid TC action index value"); 1681 goto err_out; 1682 } 1683 index = nla_get_u32(tb[TCA_ACT_INDEX]); 1684 1685 err = -EINVAL; 1686 ops = tc_lookup_action(tb[TCA_ACT_KIND]); 1687 if (!ops) { /* could happen in batch of actions */ 1688 NL_SET_ERR_MSG(extack, "Specified TC action kind not found"); 1689 goto err_out; 1690 } 1691 err = -ENOENT; 1692 if (__tcf_idr_search(net, ops, &a, index) == 0) { 1693 NL_SET_ERR_MSG(extack, "TC action with specified index not found"); 1694 goto err_mod; 1695 } 1696 1697 module_put(ops->owner); 1698 return a; 1699 1700 err_mod: 1701 module_put(ops->owner); 1702 err_out: 1703 return ERR_PTR(err); 1704 } 1705 1706 static int tca_action_flush(struct net *net, struct nlattr *nla, 1707 struct nlmsghdr *n, u32 portid, 1708 struct netlink_ext_ack *extack) 1709 { 1710 struct sk_buff *skb; 1711 unsigned char *b; 1712 struct nlmsghdr *nlh; 1713 struct tcamsg *t; 1714 struct netlink_callback dcb; 1715 struct nlattr *nest; 1716 struct nlattr *tb[TCA_ACT_MAX + 1]; 1717 const struct tc_action_ops *ops; 1718 struct nlattr *kind; 1719 int err = -ENOMEM; 1720 1721 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); 1722 if (!skb) 1723 return err; 1724 1725 b = skb_tail_pointer(skb); 1726 1727 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, 1728 tcf_action_policy, extack); 1729 if (err < 0) 1730 goto err_out; 1731 1732 err = -EINVAL; 1733 kind = tb[TCA_ACT_KIND]; 1734 ops = tc_lookup_action(kind); 1735 if (!ops) { /*some idjot trying to flush unknown action */ 1736 NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action"); 1737 goto err_out; 1738 } 1739 1740 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION, 1741 sizeof(*t), 0); 1742 if (!nlh) { 1743 NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification"); 1744 goto out_module_put; 1745 } 1746 t = nlmsg_data(nlh); 1747 t->tca_family = AF_UNSPEC; 1748 t->tca__pad1 = 0; 1749 t->tca__pad2 = 0; 1750 1751 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB); 1752 if (!nest) { 1753 NL_SET_ERR_MSG(extack, "Failed to add new netlink message"); 1754 goto out_module_put; 1755 } 1756 1757 err = __tcf_generic_walker(net, skb, &dcb, RTM_DELACTION, ops, extack); 1758 if (err <= 0) { 1759 nla_nest_cancel(skb, nest); 1760 goto out_module_put; 1761 } 1762 1763 nla_nest_end(skb, nest); 1764 1765 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 1766 nlh->nlmsg_flags |= NLM_F_ROOT; 1767 module_put(ops->owner); 1768 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, 1769 n->nlmsg_flags & NLM_F_ECHO); 1770 if (err < 0) 1771 NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification"); 1772 1773 return err; 1774 1775 out_module_put: 1776 module_put(ops->owner); 1777 err_out: 1778 kfree_skb(skb); 1779 return err; 1780 } 1781 1782 static int tcf_action_delete(struct net *net, struct tc_action *actions[]) 1783 { 1784 struct tc_action *a; 1785 int i; 1786 1787 tcf_act_for_each_action(i, a, actions) { 1788 const struct tc_action_ops *ops = a->ops; 1789 /* Actions can be deleted concurrently so we must save their 1790 * type and id to search again after reference is released. 1791 */ 1792 struct tcf_idrinfo *idrinfo = a->idrinfo; 1793 u32 act_index = a->tcfa_index; 1794 1795 actions[i] = NULL; 1796 if (tcf_action_put(a)) { 1797 /* last reference, action was deleted concurrently */ 1798 module_put(ops->owner); 1799 } else { 1800 int ret; 1801 1802 /* now do the delete */ 1803 ret = tcf_idr_delete_index(idrinfo, act_index); 1804 if (ret < 0) 1805 return ret; 1806 } 1807 } 1808 return 0; 1809 } 1810 1811 static struct sk_buff *tcf_reoffload_del_notify_msg(struct net *net, 1812 struct tc_action *action) 1813 { 1814 size_t attr_size = tcf_action_fill_size(action); 1815 struct tc_action *actions[TCA_ACT_MAX_PRIO] = { 1816 [0] = action, 1817 }; 1818 struct sk_buff *skb; 1819 1820 skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL); 1821 if (!skb) 1822 return ERR_PTR(-ENOBUFS); 1823 1824 if (tca_get_fill(skb, actions, 0, 0, 0, RTM_DELACTION, 0, 1, NULL) <= 0) { 1825 kfree_skb(skb); 1826 return ERR_PTR(-EINVAL); 1827 } 1828 1829 return skb; 1830 } 1831 1832 static int tcf_reoffload_del_notify(struct net *net, struct tc_action *action) 1833 { 1834 const struct tc_action_ops *ops = action->ops; 1835 struct sk_buff *skb; 1836 int ret; 1837 1838 if (!rtnl_notify_needed(net, 0, RTNLGRP_TC)) { 1839 skb = NULL; 1840 } else { 1841 skb = tcf_reoffload_del_notify_msg(net, action); 1842 if (IS_ERR(skb)) 1843 return PTR_ERR(skb); 1844 } 1845 1846 ret = tcf_idr_release_unsafe(action); 1847 if (ret == ACT_P_DELETED) { 1848 module_put(ops->owner); 1849 ret = rtnetlink_maybe_send(skb, net, 0, RTNLGRP_TC, 0); 1850 } else { 1851 kfree_skb(skb); 1852 } 1853 1854 return ret; 1855 } 1856 1857 int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb, 1858 void *cb_priv, bool add) 1859 { 1860 struct tc_act_pernet_id *id_ptr; 1861 struct tcf_idrinfo *idrinfo; 1862 struct tc_action_net *tn; 1863 struct tc_action *p; 1864 unsigned int act_id; 1865 unsigned long tmp; 1866 unsigned long id; 1867 struct idr *idr; 1868 struct net *net; 1869 int ret; 1870 1871 if (!cb) 1872 return -EINVAL; 1873 1874 down_read(&net_rwsem); 1875 mutex_lock(&act_id_mutex); 1876 1877 for_each_net(net) { 1878 list_for_each_entry(id_ptr, &act_pernet_id_list, list) { 1879 act_id = id_ptr->id; 1880 tn = net_generic(net, act_id); 1881 if (!tn) 1882 continue; 1883 idrinfo = tn->idrinfo; 1884 if (!idrinfo) 1885 continue; 1886 1887 mutex_lock(&idrinfo->lock); 1888 idr = &idrinfo->action_idr; 1889 idr_for_each_entry_ul(idr, p, tmp, id) { 1890 if (IS_ERR(p) || tc_act_bind(p->tcfa_flags)) 1891 continue; 1892 if (add) { 1893 tcf_action_offload_add_ex(p, NULL, cb, 1894 cb_priv); 1895 continue; 1896 } 1897 1898 /* cb unregister to update hw count */ 1899 ret = tcf_action_offload_del_ex(p, cb, cb_priv); 1900 if (ret < 0) 1901 continue; 1902 if (tc_act_skip_sw(p->tcfa_flags) && 1903 !tc_act_in_hw(p)) 1904 tcf_reoffload_del_notify(net, p); 1905 } 1906 mutex_unlock(&idrinfo->lock); 1907 } 1908 } 1909 mutex_unlock(&act_id_mutex); 1910 up_read(&net_rwsem); 1911 1912 return 0; 1913 } 1914 1915 static struct sk_buff *tcf_del_notify_msg(struct net *net, struct nlmsghdr *n, 1916 struct tc_action *actions[], 1917 u32 portid, size_t attr_size, 1918 struct netlink_ext_ack *extack) 1919 { 1920 struct sk_buff *skb; 1921 1922 skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL); 1923 if (!skb) 1924 return ERR_PTR(-ENOBUFS); 1925 1926 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION, 1927 0, 2, extack) <= 0) { 1928 NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes"); 1929 kfree_skb(skb); 1930 return ERR_PTR(-EINVAL); 1931 } 1932 1933 return skb; 1934 } 1935 1936 static int tcf_del_notify(struct net *net, struct nlmsghdr *n, 1937 struct tc_action *actions[], u32 portid, 1938 size_t attr_size, struct netlink_ext_ack *extack) 1939 { 1940 struct sk_buff *skb; 1941 int ret; 1942 1943 if (!rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC)) { 1944 skb = NULL; 1945 } else { 1946 skb = tcf_del_notify_msg(net, n, actions, portid, attr_size, 1947 extack); 1948 if (IS_ERR(skb)) 1949 return PTR_ERR(skb); 1950 } 1951 1952 /* now do the delete */ 1953 ret = tcf_action_delete(net, actions); 1954 if (ret < 0) { 1955 NL_SET_ERR_MSG(extack, "Failed to delete TC action"); 1956 kfree_skb(skb); 1957 return ret; 1958 } 1959 1960 return rtnetlink_maybe_send(skb, net, portid, RTNLGRP_TC, 1961 n->nlmsg_flags & NLM_F_ECHO); 1962 } 1963 1964 static int 1965 tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n, 1966 u32 portid, int event, struct netlink_ext_ack *extack) 1967 { 1968 int i, ret; 1969 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; 1970 struct tc_action *act; 1971 size_t attr_size = 0; 1972 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {}; 1973 1974 ret = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL, 1975 extack); 1976 if (ret < 0) 1977 return ret; 1978 1979 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) { 1980 if (tb[1]) 1981 return tca_action_flush(net, tb[1], n, portid, extack); 1982 1983 NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action"); 1984 return -EINVAL; 1985 } 1986 1987 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { 1988 act = tcf_action_get_1(net, tb[i], n, portid, extack); 1989 if (IS_ERR(act)) { 1990 ret = PTR_ERR(act); 1991 goto err; 1992 } 1993 attr_size += tcf_action_fill_size(act); 1994 actions[i - 1] = act; 1995 } 1996 1997 attr_size = tcf_action_full_attrs_size(attr_size); 1998 1999 if (event == RTM_GETACTION) 2000 ret = tcf_get_notify(net, portid, n, actions, event, extack); 2001 else { /* delete */ 2002 ret = tcf_del_notify(net, n, actions, portid, attr_size, extack); 2003 if (ret) 2004 goto err; 2005 return 0; 2006 } 2007 err: 2008 tcf_action_put_many(actions); 2009 return ret; 2010 } 2011 2012 static struct sk_buff *tcf_add_notify_msg(struct net *net, struct nlmsghdr *n, 2013 struct tc_action *actions[], 2014 u32 portid, size_t attr_size, 2015 struct netlink_ext_ack *extack) 2016 { 2017 struct sk_buff *skb; 2018 2019 skb = alloc_skb(max(attr_size, NLMSG_GOODSIZE), GFP_KERNEL); 2020 if (!skb) 2021 return ERR_PTR(-ENOBUFS); 2022 2023 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags, 2024 RTM_NEWACTION, 0, 0, extack) <= 0) { 2025 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action"); 2026 kfree_skb(skb); 2027 return ERR_PTR(-EINVAL); 2028 } 2029 2030 return skb; 2031 } 2032 2033 static int tcf_add_notify(struct net *net, struct nlmsghdr *n, 2034 struct tc_action *actions[], u32 portid, 2035 size_t attr_size, struct netlink_ext_ack *extack) 2036 { 2037 struct sk_buff *skb; 2038 2039 if (!rtnl_notify_needed(net, n->nlmsg_flags, RTNLGRP_TC)) { 2040 skb = NULL; 2041 } else { 2042 skb = tcf_add_notify_msg(net, n, actions, portid, attr_size, 2043 extack); 2044 if (IS_ERR(skb)) 2045 return PTR_ERR(skb); 2046 } 2047 2048 return rtnetlink_maybe_send(skb, net, portid, RTNLGRP_TC, 2049 n->nlmsg_flags & NLM_F_ECHO); 2050 } 2051 2052 static int tcf_action_add(struct net *net, struct nlattr *nla, 2053 struct nlmsghdr *n, u32 portid, u32 flags, 2054 struct netlink_ext_ack *extack) 2055 { 2056 size_t attr_size = 0; 2057 int loop, ret; 2058 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {}; 2059 int init_res[TCA_ACT_MAX_PRIO] = {}; 2060 2061 for (loop = 0; loop < 10; loop++) { 2062 ret = tcf_action_init(net, NULL, nla, NULL, actions, init_res, 2063 &attr_size, flags, 0, extack); 2064 if (ret != -EAGAIN) 2065 break; 2066 } 2067 2068 if (ret < 0) 2069 return ret; 2070 2071 ret = tcf_add_notify(net, n, actions, portid, attr_size, extack); 2072 2073 /* only put bound actions */ 2074 tca_put_bound_many(actions, init_res); 2075 2076 return ret; 2077 } 2078 2079 static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = { 2080 [TCA_ROOT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAG_LARGE_DUMP_ON | 2081 TCA_ACT_FLAG_TERSE_DUMP), 2082 [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 }, 2083 }; 2084 2085 static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, 2086 struct netlink_ext_ack *extack) 2087 { 2088 struct net *net = sock_net(skb->sk); 2089 struct nlattr *tca[TCA_ROOT_MAX + 1]; 2090 u32 portid = NETLINK_CB(skb).portid; 2091 u32 flags = 0; 2092 int ret = 0; 2093 2094 if ((n->nlmsg_type != RTM_GETACTION) && 2095 !netlink_capable(skb, CAP_NET_ADMIN)) 2096 return -EPERM; 2097 2098 ret = nlmsg_parse_deprecated(n, sizeof(struct tcamsg), tca, 2099 TCA_ROOT_MAX, NULL, extack); 2100 if (ret < 0) 2101 return ret; 2102 2103 if (tca[TCA_ACT_TAB] == NULL) { 2104 NL_SET_ERR_MSG(extack, "Netlink action attributes missing"); 2105 return -EINVAL; 2106 } 2107 2108 /* n->nlmsg_flags & NLM_F_CREATE */ 2109 switch (n->nlmsg_type) { 2110 case RTM_NEWACTION: 2111 /* we are going to assume all other flags 2112 * imply create only if it doesn't exist 2113 * Note that CREATE | EXCL implies that 2114 * but since we want avoid ambiguity (eg when flags 2115 * is zero) then just set this 2116 */ 2117 if (n->nlmsg_flags & NLM_F_REPLACE) 2118 flags = TCA_ACT_FLAGS_REPLACE; 2119 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, flags, 2120 extack); 2121 break; 2122 case RTM_DELACTION: 2123 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, 2124 portid, RTM_DELACTION, extack); 2125 break; 2126 case RTM_GETACTION: 2127 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, 2128 portid, RTM_GETACTION, extack); 2129 break; 2130 default: 2131 BUG(); 2132 } 2133 2134 return ret; 2135 } 2136 2137 static struct nlattr *find_dump_kind(struct nlattr **nla) 2138 { 2139 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1]; 2140 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; 2141 struct nlattr *kind; 2142 2143 tb1 = nla[TCA_ACT_TAB]; 2144 if (tb1 == NULL) 2145 return NULL; 2146 2147 if (nla_parse_deprecated(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0) 2148 return NULL; 2149 2150 if (tb[1] == NULL) 2151 return NULL; 2152 if (nla_parse_nested_deprecated(tb2, TCA_ACT_MAX, tb[1], tcf_action_policy, NULL) < 0) 2153 return NULL; 2154 kind = tb2[TCA_ACT_KIND]; 2155 2156 return kind; 2157 } 2158 2159 static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) 2160 { 2161 struct net *net = sock_net(skb->sk); 2162 struct nlmsghdr *nlh; 2163 unsigned char *b = skb_tail_pointer(skb); 2164 struct nlattr *nest; 2165 struct tc_action_ops *a_o; 2166 int ret = 0; 2167 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh); 2168 struct nlattr *tb[TCA_ROOT_MAX + 1]; 2169 struct nlattr *count_attr = NULL; 2170 unsigned long jiffy_since = 0; 2171 struct nlattr *kind = NULL; 2172 struct nla_bitfield32 bf; 2173 u32 msecs_since = 0; 2174 u32 act_count = 0; 2175 2176 ret = nlmsg_parse_deprecated(cb->nlh, sizeof(struct tcamsg), tb, 2177 TCA_ROOT_MAX, tcaa_policy, cb->extack); 2178 if (ret < 0) 2179 return ret; 2180 2181 kind = find_dump_kind(tb); 2182 if (kind == NULL) { 2183 pr_info("tc_dump_action: action bad kind\n"); 2184 return 0; 2185 } 2186 2187 a_o = tc_lookup_action(kind); 2188 if (a_o == NULL) 2189 return 0; 2190 2191 cb->args[2] = 0; 2192 if (tb[TCA_ROOT_FLAGS]) { 2193 bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]); 2194 cb->args[2] = bf.value; 2195 } 2196 2197 if (tb[TCA_ROOT_TIME_DELTA]) { 2198 msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]); 2199 } 2200 2201 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 2202 cb->nlh->nlmsg_type, sizeof(*t), 0); 2203 if (!nlh) 2204 goto out_module_put; 2205 2206 if (msecs_since) 2207 jiffy_since = jiffies - msecs_to_jiffies(msecs_since); 2208 2209 t = nlmsg_data(nlh); 2210 t->tca_family = AF_UNSPEC; 2211 t->tca__pad1 = 0; 2212 t->tca__pad2 = 0; 2213 cb->args[3] = jiffy_since; 2214 count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32)); 2215 if (!count_attr) 2216 goto out_module_put; 2217 2218 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB); 2219 if (nest == NULL) 2220 goto out_module_put; 2221 2222 ret = __tcf_generic_walker(net, skb, cb, RTM_GETACTION, a_o, NULL); 2223 if (ret < 0) 2224 goto out_module_put; 2225 2226 if (ret > 0) { 2227 nla_nest_end(skb, nest); 2228 ret = skb->len; 2229 act_count = cb->args[1]; 2230 memcpy(nla_data(count_attr), &act_count, sizeof(u32)); 2231 cb->args[1] = 0; 2232 } else 2233 nlmsg_trim(skb, b); 2234 2235 nlh->nlmsg_len = skb_tail_pointer(skb) - b; 2236 if (NETLINK_CB(cb->skb).portid && ret) 2237 nlh->nlmsg_flags |= NLM_F_MULTI; 2238 module_put(a_o->owner); 2239 return skb->len; 2240 2241 out_module_put: 2242 module_put(a_o->owner); 2243 nlmsg_trim(skb, b); 2244 return skb->len; 2245 } 2246 2247 static int __init tc_action_init(void) 2248 { 2249 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0); 2250 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0); 2251 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action, 2252 0); 2253 2254 return 0; 2255 } 2256 2257 subsys_initcall(tc_action_init); 2258