pkt_cls.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef __NET_PKT_CLS_H
   3#define __NET_PKT_CLS_H
   4
   5#include <linux/pkt_cls.h>
   6#include <linux/workqueue.h>
   7#include <net/sch_generic.h>
   8#include <net/act_api.h>
   9#include <net/net_namespace.h>
  10
  11/* TC action not accessible from user space */
  12#define TC_ACT_CONSUMED		(TC_ACT_VALUE_MAX + 1)
  13
  14/* Basic packet classifier frontend definitions. */
  15
  16struct tcf_walker {
  17	int	stop;
  18	int	skip;
  19	int	count;
  20	bool	nonempty;
  21	unsigned long cookie;
  22	int	(*fn)(struct tcf_proto *, void *node, struct tcf_walker *);
  23};
  24
  25int register_tcf_proto_ops(struct tcf_proto_ops *ops);
  26void unregister_tcf_proto_ops(struct tcf_proto_ops *ops);
  27#define NET_CLS_ALIAS_PREFIX "net-cls-"
  28#define MODULE_ALIAS_NET_CLS(kind)	MODULE_ALIAS(NET_CLS_ALIAS_PREFIX kind)
  29
  30struct tcf_block_ext_info {
  31	enum flow_block_binder_type binder_type;
  32	tcf_chain_head_change_t *chain_head_change;
  33	void *chain_head_change_priv;
  34	u32 block_index;
  35};
  36
  37struct tcf_qevent {
  38	struct tcf_block	*block;
  39	struct tcf_block_ext_info info;
  40	struct tcf_proto __rcu *filter_chain;
  41};
  42
  43struct tcf_block_cb;
  44bool tcf_queue_work(struct rcu_work *rwork, work_func_t func);
  45
  46#ifdef CONFIG_NET_CLS
  47struct tcf_chain *tcf_chain_get_by_act(struct tcf_block *block,
  48				       u32 chain_index);
  49void tcf_chain_put_by_act(struct tcf_chain *chain);
  50struct tcf_chain *tcf_get_next_chain(struct tcf_block *block,
  51				     struct tcf_chain *chain);
  52struct tcf_proto *tcf_get_next_proto(struct tcf_chain *chain,
  53				     struct tcf_proto *tp);
  54void tcf_block_netif_keep_dst(struct tcf_block *block);
  55int tcf_block_get(struct tcf_block **p_block,
  56		  struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q,
  57		  struct netlink_ext_ack *extack);
  58int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q,
  59		      struct tcf_block_ext_info *ei,
  60		      struct netlink_ext_ack *extack);
  61void tcf_block_put(struct tcf_block *block);
  62void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q,
  63		       struct tcf_block_ext_info *ei);
  64int tcf_exts_init_ex(struct tcf_exts *exts, struct net *net, int action,
  65		     int police, struct tcf_proto *tp, u32 handle, bool used_action_miss);
  66
  67static inline bool tcf_block_shared(struct tcf_block *block)
  68{
  69	return block->index;
  70}
  71
  72static inline bool tcf_block_non_null_shared(struct tcf_block *block)
  73{
  74	return block && block->index;
  75}
  76
  77#ifdef CONFIG_NET_CLS_ACT
  78DECLARE_STATIC_KEY_FALSE(tcf_sw_enabled_key);
  79
  80static inline bool tcf_block_bypass_sw(struct tcf_block *block)
  81{
  82	return block && !atomic_read(&block->useswcnt);
  83}
  84#endif
  85
  86static inline struct Qdisc *tcf_block_q(struct tcf_block *block)
  87{
  88	WARN_ON(tcf_block_shared(block));
  89	return block->q;
  90}
  91
  92int tcf_classify(struct sk_buff *skb,
  93		 const struct tcf_block *block,
  94		 const struct tcf_proto *tp, struct tcf_result *res,
  95		 bool compat_mode);
  96
  97static inline bool tc_cls_stats_dump(struct tcf_proto *tp,
  98				     struct tcf_walker *arg,
  99				     void *filter)
 100{
 101	if (arg->count >= arg->skip && arg->fn(tp, filter, arg) < 0) {
 102		arg->stop = 1;
 103		return false;
 104	}
 105
 106	arg->count++;
 107	return true;
 108}
 109
 110#else
 111static inline bool tcf_block_shared(struct tcf_block *block)
 112{
 113	return false;
 114}
 115
 116static inline bool tcf_block_non_null_shared(struct tcf_block *block)
 117{
 118	return false;
 119}
 120
 121static inline
 122int tcf_block_get(struct tcf_block **p_block,
 123		  struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q,
 124		  struct netlink_ext_ack *extack)
 125{
 126	return 0;
 127}
 128
 129static inline
 130int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q,
 131		      struct tcf_block_ext_info *ei,
 132		      struct netlink_ext_ack *extack)
 133{
 134	return 0;
 135}
 136
 137static inline void tcf_block_put(struct tcf_block *block)
 138{
 139}
 140
 141static inline
 142void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q,
 143		       struct tcf_block_ext_info *ei)
 144{
 145}
 146
 147static inline struct Qdisc *tcf_block_q(struct tcf_block *block)
 148{
 149	return NULL;
 150}
 151
 152static inline int tcf_classify(struct sk_buff *skb,
 153			       const struct tcf_block *block,
 154			       const struct tcf_proto *tp,
 155			       struct tcf_result *res, bool compat_mode)
 156{
 157	return TC_ACT_UNSPEC;
 158}
 159
 160#endif
 161
 162static inline unsigned long
 163__cls_set_class(unsigned long *clp, unsigned long cl)
 164{
 165	return xchg(clp, cl);
 166}
 167
 168static inline void
 169__tcf_bind_filter(struct Qdisc *q, struct tcf_result *r, unsigned long base)
 170{
 171	unsigned long cl;
 172
 173	cl = q->ops->cl_ops->bind_tcf(q, base, r->classid);
 174	cl = __cls_set_class(&r->class, cl);
 175	if (cl)
 176		q->ops->cl_ops->unbind_tcf(q, cl);
 177}
 178
 179static inline void
 180tcf_bind_filter(struct tcf_proto *tp, struct tcf_result *r, unsigned long base)
 181{
 182	struct Qdisc *q = tp->chain->block->q;
 183
 184	/* Check q as it is not set for shared blocks. In that case,
 185	 * setting class is not supported.
 186	 */
 187	if (!q)
 188		return;
 189	sch_tree_lock(q);
 190	__tcf_bind_filter(q, r, base);
 191	sch_tree_unlock(q);
 192}
 193
 194static inline void
 195__tcf_unbind_filter(struct Qdisc *q, struct tcf_result *r)
 196{
 197	unsigned long cl;
 198
 199	if ((cl = __cls_set_class(&r->class, 0)) != 0)
 200		q->ops->cl_ops->unbind_tcf(q, cl);
 201}
 202
 203static inline void
 204tcf_unbind_filter(struct tcf_proto *tp, struct tcf_result *r)
 205{
 206	struct Qdisc *q = tp->chain->block->q;
 207
 208	if (!q)
 209		return;
 210	__tcf_unbind_filter(q, r);
 211}
 212
 213static inline void tc_cls_bind_class(u32 classid, unsigned long cl,
 214				     void *q, struct tcf_result *res,
 215				     unsigned long base)
 216{
 217	if (res->classid == classid) {
 218		if (cl)
 219			__tcf_bind_filter(q, res, base);
 220		else
 221			__tcf_unbind_filter(q, res);
 222	}
 223}
 224
 225struct tcf_exts {
 226#ifdef CONFIG_NET_CLS_ACT
 227	__u32	type; /* for backward compat(TCA_OLD_COMPAT) */
 228	int nr_actions;
 229	struct tc_action **actions;
 230	struct net	*net;
 231	netns_tracker	ns_tracker;
 232	struct tcf_exts_miss_cookie_node *miss_cookie_node;
 233#endif
 234	/* Map to export classifier specific extension TLV types to the
 235	 * generic extensions API. Unsupported extensions must be set to 0.
 236	 */
 237	int action;
 238	int police;
 239};
 240
 241static inline int tcf_exts_init(struct tcf_exts *exts, struct net *net,
 242				int action, int police)
 243{
 244#ifdef CONFIG_NET_CLS
 245	return tcf_exts_init_ex(exts, net, action, police, NULL, 0, false);
 246#else
 247	return -EOPNOTSUPP;
 248#endif
 249}
 250
 251/* Return false if the netns is being destroyed in cleanup_net(). Callers
 252 * need to do cleanup synchronously in this case, otherwise may race with
 253 * tc_action_net_exit(). Return true for other cases.
 254 */
 255static inline bool tcf_exts_get_net(struct tcf_exts *exts)
 256{
 257#ifdef CONFIG_NET_CLS_ACT
 258	exts->net = maybe_get_net(exts->net);
 259	if (exts->net)
 260		netns_tracker_alloc(exts->net, &exts->ns_tracker, GFP_KERNEL);
 261	return exts->net != NULL;
 262#else
 263	return true;
 264#endif
 265}
 266
 267static inline void tcf_exts_put_net(struct tcf_exts *exts)
 268{
 269#ifdef CONFIG_NET_CLS_ACT
 270	if (exts->net)
 271		put_net_track(exts->net, &exts->ns_tracker);
 272#endif
 273}
 274
 275#ifdef CONFIG_NET_CLS_ACT
 276#define tcf_exts_for_each_action(i, a, exts) \
 277	for (i = 0; i < TCA_ACT_MAX_PRIO && ((a) = (exts)->actions[i]); i++)
 278#else
 279#define tcf_exts_for_each_action(i, a, exts) \
 280	for (; 0; (void)(i), (void)(a), (void)(exts))
 281#endif
 282
 283#define tcf_act_for_each_action(i, a, actions) \
 284	for (i = 0; i < TCA_ACT_MAX_PRIO && ((a) = actions[i]); i++)
 285
 286static inline bool tc_act_in_hw(struct tc_action *act)
 287{
 288	return !!act->in_hw_count;
 289}
 290
 291static inline void
 292tcf_exts_hw_stats_update(const struct tcf_exts *exts,
 293			 struct flow_stats *stats,
 294			 bool use_act_stats)
 295{
 296#ifdef CONFIG_NET_CLS_ACT
 297	int i;
 298
 299	for (i = 0; i < exts->nr_actions; i++) {
 300		struct tc_action *a = exts->actions[i];
 301
 302		if (use_act_stats || tc_act_in_hw(a)) {
 303			if (!tcf_action_update_hw_stats(a))
 304				continue;
 305		}
 306
 307		preempt_disable();
 308		tcf_action_stats_update(a, stats->bytes, stats->pkts, stats->drops,
 309					stats->lastused, true);
 310		preempt_enable();
 311
 312		a->used_hw_stats = stats->used_hw_stats;
 313		a->used_hw_stats_valid = stats->used_hw_stats_valid;
 314	}
 315#endif
 316}
 317
 318/**
 319 * tcf_exts_has_actions - check if at least one action is present
 320 * @exts: tc filter extensions handle
 321 *
 322 * Returns: true if at least one action is present.
 323 */
 324static inline bool tcf_exts_has_actions(struct tcf_exts *exts)
 325{
 326#ifdef CONFIG_NET_CLS_ACT
 327	return exts->nr_actions;
 328#else
 329	return false;
 330#endif
 331}
 332
 333/**
 334 * tcf_exts_exec - execute tc filter extensions
 335 * @skb: socket buffer
 336 * @exts: tc filter extensions handle
 337 * @res: desired result
 338 *
 339 * Executes all configured extensions. Returns TC_ACT_OK on a normal execution,
 340 * a negative number if the filter must be considered unmatched or
 341 * a positive action code (TC_ACT_*) which must be returned to the
 342 * underlying layer.
 343 */
 344static inline int
 345tcf_exts_exec(struct sk_buff *skb, struct tcf_exts *exts,
 346	      struct tcf_result *res)
 347{
 348#ifdef CONFIG_NET_CLS_ACT
 349	return tcf_action_exec(skb, exts->actions, exts->nr_actions, res);
 350#endif
 351	return TC_ACT_OK;
 352}
 353
 354static inline int
 355tcf_exts_exec_ex(struct sk_buff *skb, struct tcf_exts *exts, int act_index,
 356		 struct tcf_result *res)
 357{
 358#ifdef CONFIG_NET_CLS_ACT
 359	return tcf_action_exec(skb, exts->actions + act_index,
 360			       exts->nr_actions - act_index, res);
 361#else
 362	return TC_ACT_OK;
 363#endif
 364}
 365
 366int tcf_exts_validate(struct net *net, struct tcf_proto *tp,
 367		      struct nlattr **tb, struct nlattr *rate_tlv,
 368		      struct tcf_exts *exts, u32 flags,
 369		      struct netlink_ext_ack *extack);
 370int tcf_exts_validate_ex(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
 371			 struct nlattr *rate_tlv, struct tcf_exts *exts,
 372			 u32 flags, u32 fl_flags, struct netlink_ext_ack *extack);
 373void tcf_exts_destroy(struct tcf_exts *exts);
 374void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src);
 375int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts);
 376int tcf_exts_terse_dump(struct sk_buff *skb, struct tcf_exts *exts);
 377int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts);
 378
 379/**
 380 * struct tcf_pkt_info - packet information
 381 *
 382 * @ptr: start of the pkt data
 383 * @nexthdr: offset of the next header
 384 */
 385struct tcf_pkt_info {
 386	unsigned char *		ptr;
 387	int			nexthdr;
 388};
 389
 390#ifdef CONFIG_NET_EMATCH
 391
 392struct tcf_ematch_ops;
 393
 394/**
 395 * struct tcf_ematch - extended match (ematch)
 396 * 
 397 * @matchid: identifier to allow userspace to reidentify a match
 398 * @flags: flags specifying attributes and the relation to other matches
 399 * @ops: the operations lookup table of the corresponding ematch module
 400 * @datalen: length of the ematch specific configuration data
 401 * @data: ematch specific data
 402 * @net: the network namespace
 403 */
 404struct tcf_ematch {
 405	struct tcf_ematch_ops * ops;
 406	unsigned long		data;
 407	unsigned int		datalen;
 408	u16			matchid;
 409	u16			flags;
 410	struct net		*net;
 411};
 412
 413static inline int tcf_em_is_container(struct tcf_ematch *em)
 414{
 415	return !em->ops;
 416}
 417
 418static inline int tcf_em_is_simple(struct tcf_ematch *em)
 419{
 420	return em->flags & TCF_EM_SIMPLE;
 421}
 422
 423static inline int tcf_em_is_inverted(struct tcf_ematch *em)
 424{
 425	return em->flags & TCF_EM_INVERT;
 426}
 427
 428static inline int tcf_em_last_match(struct tcf_ematch *em)
 429{
 430	return (em->flags & TCF_EM_REL_MASK) == TCF_EM_REL_END;
 431}
 432
 433static inline int tcf_em_early_end(struct tcf_ematch *em, int result)
 434{
 435	if (tcf_em_last_match(em))
 436		return 1;
 437
 438	if (result == 0 && em->flags & TCF_EM_REL_AND)
 439		return 1;
 440
 441	if (result != 0 && em->flags & TCF_EM_REL_OR)
 442		return 1;
 443
 444	return 0;
 445}
 446	
 447/**
 448 * struct tcf_ematch_tree - ematch tree handle
 449 *
 450 * @hdr: ematch tree header supplied by userspace
 451 * @matches: array of ematches
 452 */
 453struct tcf_ematch_tree {
 454	struct tcf_ematch_tree_hdr hdr;
 455	struct tcf_ematch *	matches;
 456	
 457};
 458
 459/**
 460 * struct tcf_ematch_ops - ematch module operations
 461 * 
 462 * @kind: identifier (kind) of this ematch module
 463 * @datalen: length of expected configuration data (optional)
 464 * @change: called during validation (optional)
 465 * @match: called during ematch tree evaluation, must return 1/0
 466 * @destroy: called during destroyage (optional)
 467 * @dump: called during dumping process (optional)
 468 * @owner: owner, must be set to THIS_MODULE
 469 * @link: link to previous/next ematch module (internal use)
 470 */
 471struct tcf_ematch_ops {
 472	int			kind;
 473	int			datalen;
 474	int			(*change)(struct net *net, void *,
 475					  int, struct tcf_ematch *);
 476	int			(*match)(struct sk_buff *, struct tcf_ematch *,
 477					 struct tcf_pkt_info *);
 478	void			(*destroy)(struct tcf_ematch *);
 479	int			(*dump)(struct sk_buff *, struct tcf_ematch *);
 480	struct module		*owner;
 481	struct list_head	link;
 482};
 483
 484int tcf_em_register(struct tcf_ematch_ops *);
 485void tcf_em_unregister(struct tcf_ematch_ops *);
 486int tcf_em_tree_validate(struct tcf_proto *, struct nlattr *,
 487			 struct tcf_ematch_tree *);
 488void tcf_em_tree_destroy(struct tcf_ematch_tree *);
 489int tcf_em_tree_dump(struct sk_buff *, struct tcf_ematch_tree *, int);
 490int __tcf_em_tree_match(struct sk_buff *, struct tcf_ematch_tree *,
 491			struct tcf_pkt_info *);
 492
 493/**
 494 * tcf_em_tree_match - evaluate an ematch tree
 495 *
 496 * @skb: socket buffer of the packet in question
 497 * @tree: ematch tree to be used for evaluation
 498 * @info: packet information examined by classifier
 499 *
 500 * This function matches @skb against the ematch tree in @tree by going
 501 * through all ematches respecting their logic relations returning
 502 * as soon as the result is obvious.
 503 *
 504 * Returns: 1 if the ematch tree as-one matches, no ematches are configured
 505 * or ematch is not enabled in the kernel, otherwise 0 is returned.
 506 */
 507static inline int tcf_em_tree_match(struct sk_buff *skb,
 508				    struct tcf_ematch_tree *tree,
 509				    struct tcf_pkt_info *info)
 510{
 511	if (tree->hdr.nmatches)
 512		return __tcf_em_tree_match(skb, tree, info);
 513	else
 514		return 1;
 515}
 516
 517#define MODULE_ALIAS_TCF_EMATCH(kind)	MODULE_ALIAS("ematch-kind-" __stringify(kind))
 518
 519#else /* CONFIG_NET_EMATCH */
 520
 521struct tcf_ematch_tree {
 522};
 523
 524#define tcf_em_tree_validate(tp, tb, t) ((void)(t), 0)
 525#define tcf_em_tree_destroy(t) do { (void)(t); } while(0)
 526#define tcf_em_tree_dump(skb, t, tlv) (0)
 527#define tcf_em_tree_match(skb, t, info) ((void)(info), 1)
 528
 529#endif /* CONFIG_NET_EMATCH */
 530
 531static inline unsigned char * tcf_get_base_ptr(struct sk_buff *skb, int layer)
 532{
 533	switch (layer) {
 534		case TCF_LAYER_LINK:
 535			return skb_mac_header(skb);
 536		case TCF_LAYER_NETWORK:
 537			return skb_network_header(skb);
 538		case TCF_LAYER_TRANSPORT:
 539			if (!skb_transport_header_was_set(skb))
 540				break;
 541			return skb_transport_header(skb);
 542	}
 543
 544	return NULL;
 545}
 546
 547static inline int tcf_valid_offset(const struct sk_buff *skb,
 548				   const unsigned char *ptr, const int len)
 549{
 550	return likely((ptr + len) <= skb_tail_pointer(skb) &&
 551		      ptr >= skb->head &&
 552		      (ptr <= (ptr + len)));
 553}
 554
 555static inline int
 556tcf_change_indev(struct net *net, struct nlattr *indev_tlv,
 557		 struct netlink_ext_ack *extack)
 558{
 559	char indev[IFNAMSIZ];
 560	struct net_device *dev;
 561
 562	if (nla_strscpy(indev, indev_tlv, IFNAMSIZ) < 0) {
 563		NL_SET_ERR_MSG_ATTR(extack, indev_tlv,
 564				    "Interface name too long");
 565		return -EINVAL;
 566	}
 567	dev = __dev_get_by_name(net, indev);
 568	if (!dev) {
 569		NL_SET_ERR_MSG_ATTR(extack, indev_tlv,
 570				    "Network device not found");
 571		return -ENODEV;
 572	}
 573	return dev->ifindex;
 574}
 575
 576static inline bool
 577tcf_match_indev(struct sk_buff *skb, int ifindex)
 578{
 579	if (!ifindex)
 580		return true;
 581	if  (!skb->skb_iif)
 582		return false;
 583	return ifindex == skb->skb_iif;
 584}
 585
 586int tc_setup_offload_action(struct flow_action *flow_action,
 587			    const struct tcf_exts *exts,
 588			    struct netlink_ext_ack *extack);
 589void tc_cleanup_offload_action(struct flow_action *flow_action);
 590int tc_setup_action(struct flow_action *flow_action,
 591		    struct tc_action *actions[],
 592		    u32 miss_cookie_base,
 593		    struct netlink_ext_ack *extack);
 594
 595int tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type,
 596		     void *type_data, bool err_stop, bool rtnl_held);
 597int tc_setup_cb_add(struct tcf_block *block, struct tcf_proto *tp,
 598		    enum tc_setup_type type, void *type_data, bool err_stop,
 599		    u32 *flags, unsigned int *in_hw_count, bool rtnl_held);
 600int tc_setup_cb_replace(struct tcf_block *block, struct tcf_proto *tp,
 601			enum tc_setup_type type, void *type_data, bool err_stop,
 602			u32 *old_flags, unsigned int *old_in_hw_count,
 603			u32 *new_flags, unsigned int *new_in_hw_count,
 604			bool rtnl_held);
 605int tc_setup_cb_destroy(struct tcf_block *block, struct tcf_proto *tp,
 606			enum tc_setup_type type, void *type_data, bool err_stop,
 607			u32 *flags, unsigned int *in_hw_count, bool rtnl_held);
 608int tc_setup_cb_reoffload(struct tcf_block *block, struct tcf_proto *tp,
 609			  bool add, flow_setup_cb_t *cb,
 610			  enum tc_setup_type type, void *type_data,
 611			  void *cb_priv, u32 *flags, unsigned int *in_hw_count);
 612unsigned int tcf_exts_num_actions(struct tcf_exts *exts);
 613
 614#ifdef CONFIG_NET_CLS_ACT
 615int tcf_qevent_init(struct tcf_qevent *qe, struct Qdisc *sch,
 616		    enum flow_block_binder_type binder_type,
 617		    struct nlattr *block_index_attr,
 618		    struct netlink_ext_ack *extack);
 619void tcf_qevent_destroy(struct tcf_qevent *qe, struct Qdisc *sch);
 620int tcf_qevent_validate_change(struct tcf_qevent *qe, struct nlattr *block_index_attr,
 621			       struct netlink_ext_ack *extack);
 622struct sk_buff *tcf_qevent_handle(struct tcf_qevent *qe, struct Qdisc *sch, struct sk_buff *skb,
 623				  struct sk_buff **to_free, int *ret);
 624int tcf_qevent_dump(struct sk_buff *skb, int attr_name, struct tcf_qevent *qe);
 625#else
 626static inline int tcf_qevent_init(struct tcf_qevent *qe, struct Qdisc *sch,
 627				  enum flow_block_binder_type binder_type,
 628				  struct nlattr *block_index_attr,
 629				  struct netlink_ext_ack *extack)
 630{
 631	return 0;
 632}
 633
 634static inline void tcf_qevent_destroy(struct tcf_qevent *qe, struct Qdisc *sch)
 635{
 636}
 637
 638static inline int tcf_qevent_validate_change(struct tcf_qevent *qe, struct nlattr *block_index_attr,
 639					     struct netlink_ext_ack *extack)
 640{
 641	return 0;
 642}
 643
 644static inline struct sk_buff *
 645tcf_qevent_handle(struct tcf_qevent *qe, struct Qdisc *sch, struct sk_buff *skb,
 646		  struct sk_buff **to_free, int *ret)
 647{
 648	return skb;
 649}
 650
 651static inline int tcf_qevent_dump(struct sk_buff *skb, int attr_name, struct tcf_qevent *qe)
 652{
 653	return 0;
 654}
 655#endif
 656
 657struct tc_cls_u32_knode {
 658	struct tcf_exts *exts;
 659	struct tcf_result *res;
 660	struct tc_u32_sel *sel;
 661	u32 handle;
 662	u32 val;
 663	u32 mask;
 664	u32 link_handle;
 665	u8 fshift;
 666};
 667
 668struct tc_cls_u32_hnode {
 669	u32 handle;
 670	u32 prio;
 671	unsigned int divisor;
 672};
 673
 674enum tc_clsu32_command {
 675	TC_CLSU32_NEW_KNODE,
 676	TC_CLSU32_REPLACE_KNODE,
 677	TC_CLSU32_DELETE_KNODE,
 678	TC_CLSU32_NEW_HNODE,
 679	TC_CLSU32_REPLACE_HNODE,
 680	TC_CLSU32_DELETE_HNODE,
 681};
 682
 683struct tc_cls_u32_offload {
 684	struct flow_cls_common_offload common;
 685	/* knode values */
 686	enum tc_clsu32_command command;
 687	union {
 688		struct tc_cls_u32_knode knode;
 689		struct tc_cls_u32_hnode hnode;
 690	};
 691};
 692
 693static inline bool tc_can_offload(const struct net_device *dev)
 694{
 695	return dev->features & NETIF_F_HW_TC;
 696}
 697
 698static inline bool tc_can_offload_extack(const struct net_device *dev,
 699					 struct netlink_ext_ack *extack)
 700{
 701	bool can = tc_can_offload(dev);
 702
 703	if (!can)
 704		NL_SET_ERR_MSG(extack, "TC offload is disabled on net device");
 705
 706	return can;
 707}
 708
 709static inline bool
 710tc_cls_can_offload_and_chain0(const struct net_device *dev,
 711			      struct flow_cls_common_offload *common)
 712{
 713	if (!tc_can_offload_extack(dev, common->extack))
 714		return false;
 715	if (common->chain_index) {
 716		NL_SET_ERR_MSG(common->extack,
 717			       "Driver supports only offload of chain 0");
 718		return false;
 719	}
 720	return true;
 721}
 722
 723static inline bool tc_skip_hw(u32 flags)
 724{
 725	return (flags & TCA_CLS_FLAGS_SKIP_HW) ? true : false;
 726}
 727
 728static inline bool tc_skip_sw(u32 flags)
 729{
 730	return (flags & TCA_CLS_FLAGS_SKIP_SW) ? true : false;
 731}
 732
 733/* SKIP_HW and SKIP_SW are mutually exclusive flags. */
 734static inline bool tc_flags_valid(u32 flags)
 735{
 736	if (flags & ~(TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW |
 737		      TCA_CLS_FLAGS_VERBOSE))
 738		return false;
 739
 740	flags &= TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW;
 741	if (!(flags ^ (TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW)))
 742		return false;
 743
 744	return true;
 745}
 746
 747static inline bool tc_in_hw(u32 flags)
 748{
 749	return (flags & TCA_CLS_FLAGS_IN_HW) ? true : false;
 750}
 751
 752static inline void
 753tc_cls_common_offload_init(struct flow_cls_common_offload *cls_common,
 754			   const struct tcf_proto *tp, u32 flags,
 755			   struct netlink_ext_ack *extack)
 756{
 757	cls_common->chain_index = tp->chain->index;
 758	cls_common->protocol = tp->protocol;
 759	cls_common->prio = tp->prio >> 16;
 760	cls_common->skip_sw = tc_skip_sw(flags);
 761	if (tc_skip_sw(flags) || flags & TCA_CLS_FLAGS_VERBOSE)
 762		cls_common->extack = extack;
 763}
 764
 765static inline void tcf_proto_update_usesw(struct tcf_proto *tp, u32 flags)
 766{
 767	if (tp->usesw)
 768		return;
 769	if (tc_skip_sw(flags) && tc_in_hw(flags))
 770		return;
 771	tp->usesw = true;
 772}
 773
 774#if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
 775static inline struct tc_skb_ext *tc_skb_ext_alloc(struct sk_buff *skb)
 776{
 777	struct tc_skb_ext *tc_skb_ext = skb_ext_add(skb, TC_SKB_EXT);
 778
 779	if (tc_skb_ext)
 780		memset(tc_skb_ext, 0, sizeof(*tc_skb_ext));
 781	return tc_skb_ext;
 782}
 783#endif
 784
 785enum tc_matchall_command {
 786	TC_CLSMATCHALL_REPLACE,
 787	TC_CLSMATCHALL_DESTROY,
 788	TC_CLSMATCHALL_STATS,
 789};
 790
 791struct tc_cls_matchall_offload {
 792	struct flow_cls_common_offload common;
 793	enum tc_matchall_command command;
 794	struct flow_rule *rule;
 795	struct flow_stats stats;
 796	bool use_act_stats;
 797	unsigned long cookie;
 798};
 799
 800enum tc_clsbpf_command {
 801	TC_CLSBPF_OFFLOAD,
 802	TC_CLSBPF_STATS,
 803};
 804
 805struct tc_cls_bpf_offload {
 806	struct flow_cls_common_offload common;
 807	enum tc_clsbpf_command command;
 808	struct tcf_exts *exts;
 809	struct bpf_prog *prog;
 810	struct bpf_prog *oldprog;
 811	const char *name;
 812	bool exts_integrated;
 813};
 814
 815/* This structure holds cookie structure that is passed from user
 816 * to the kernel for actions and classifiers
 817 */
 818struct tc_cookie {
 819	u8  *data;
 820	u32 len;
 821	struct rcu_head rcu;
 822};
 823
 824struct tc_qopt_offload_stats {
 825	struct gnet_stats_basic_sync *bstats;
 826	struct gnet_stats_queue *qstats;
 827};
 828
 829enum tc_mq_command {
 830	TC_MQ_CREATE,
 831	TC_MQ_DESTROY,
 832	TC_MQ_STATS,
 833	TC_MQ_GRAFT,
 834};
 835
 836struct tc_mq_opt_offload_graft_params {
 837	unsigned long queue;
 838	u32 child_handle;
 839};
 840
 841struct tc_mq_qopt_offload {
 842	enum tc_mq_command command;
 843	u32 handle;
 844	union {
 845		struct tc_qopt_offload_stats stats;
 846		struct tc_mq_opt_offload_graft_params graft_params;
 847	};
 848};
 849
 850enum tc_htb_command {
 851	/* Root */
 852	TC_HTB_CREATE, /* Initialize HTB offload. */
 853	TC_HTB_DESTROY, /* Destroy HTB offload. */
 854
 855	/* Classes */
 856	/* Allocate qid and create leaf. */
 857	TC_HTB_LEAF_ALLOC_QUEUE,
 858	/* Convert leaf to inner, preserve and return qid, create new leaf. */
 859	TC_HTB_LEAF_TO_INNER,
 860	/* Delete leaf, while siblings remain. */
 861	TC_HTB_LEAF_DEL,
 862	/* Delete leaf, convert parent to leaf, preserving qid. */
 863	TC_HTB_LEAF_DEL_LAST,
 864	/* TC_HTB_LEAF_DEL_LAST, but delete driver data on hardware errors. */
 865	TC_HTB_LEAF_DEL_LAST_FORCE,
 866	/* Modify parameters of a node. */
 867	TC_HTB_NODE_MODIFY,
 868
 869	/* Class qdisc */
 870	TC_HTB_LEAF_QUERY_QUEUE, /* Query qid by classid. */
 871};
 872
 873struct tc_htb_qopt_offload {
 874	struct netlink_ext_ack *extack;
 875	enum tc_htb_command command;
 876	u32 parent_classid;
 877	u16 classid;
 878	u16 qid;
 879	u32 quantum;
 880	u64 rate;
 881	u64 ceil;
 882	u8 prio;
 883};
 884
 885#define TC_HTB_CLASSID_ROOT U32_MAX
 886
 887enum tc_red_command {
 888	TC_RED_REPLACE,
 889	TC_RED_DESTROY,
 890	TC_RED_STATS,
 891	TC_RED_XSTATS,
 892	TC_RED_GRAFT,
 893};
 894
 895struct tc_red_qopt_offload_params {
 896	u32 min;
 897	u32 max;
 898	u32 probability;
 899	u32 limit;
 900	bool is_ecn;
 901	bool is_harddrop;
 902	bool is_nodrop;
 903	struct gnet_stats_queue *qstats;
 904};
 905
 906struct tc_red_qopt_offload {
 907	enum tc_red_command command;
 908	u32 handle;
 909	u32 parent;
 910	union {
 911		struct tc_red_qopt_offload_params set;
 912		struct tc_qopt_offload_stats stats;
 913		struct red_stats *xstats;
 914		u32 child_handle;
 915	};
 916};
 917
 918enum tc_gred_command {
 919	TC_GRED_REPLACE,
 920	TC_GRED_DESTROY,
 921	TC_GRED_STATS,
 922};
 923
 924struct tc_gred_vq_qopt_offload_params {
 925	bool present;
 926	u32 limit;
 927	u32 prio;
 928	u32 min;
 929	u32 max;
 930	bool is_ecn;
 931	bool is_harddrop;
 932	u32 probability;
 933	/* Only need backlog, see struct tc_prio_qopt_offload_params */
 934	u32 *backlog;
 935};
 936
 937struct tc_gred_qopt_offload_params {
 938	bool grio_on;
 939	bool wred_on;
 940	unsigned int dp_cnt;
 941	unsigned int dp_def;
 942	struct gnet_stats_queue *qstats;
 943	struct tc_gred_vq_qopt_offload_params tab[MAX_DPs];
 944};
 945
 946struct tc_gred_qopt_offload_stats {
 947	struct gnet_stats_basic_sync bstats[MAX_DPs];
 948	struct gnet_stats_queue qstats[MAX_DPs];
 949	struct red_stats *xstats[MAX_DPs];
 950};
 951
 952struct tc_gred_qopt_offload {
 953	enum tc_gred_command command;
 954	u32 handle;
 955	u32 parent;
 956	union {
 957		struct tc_gred_qopt_offload_params set;
 958		struct tc_gred_qopt_offload_stats stats;
 959	};
 960};
 961
 962enum tc_prio_command {
 963	TC_PRIO_REPLACE,
 964	TC_PRIO_DESTROY,
 965	TC_PRIO_STATS,
 966	TC_PRIO_GRAFT,
 967};
 968
 969struct tc_prio_qopt_offload_params {
 970	int bands;
 971	u8 priomap[TC_PRIO_MAX + 1];
 972	/* At the point of un-offloading the Qdisc, the reported backlog and
 973	 * qlen need to be reduced by the portion that is in HW.
 974	 */
 975	struct gnet_stats_queue *qstats;
 976};
 977
 978struct tc_prio_qopt_offload_graft_params {
 979	u8 band;
 980	u32 child_handle;
 981};
 982
 983struct tc_prio_qopt_offload {
 984	enum tc_prio_command command;
 985	u32 handle;
 986	u32 parent;
 987	union {
 988		struct tc_prio_qopt_offload_params replace_params;
 989		struct tc_qopt_offload_stats stats;
 990		struct tc_prio_qopt_offload_graft_params graft_params;
 991	};
 992};
 993
 994enum tc_root_command {
 995	TC_ROOT_GRAFT,
 996};
 997
 998struct tc_root_qopt_offload {
 999	enum tc_root_command command;
1000	u32 handle;
1001	bool ingress;
1002};
1003
1004enum tc_ets_command {
1005	TC_ETS_REPLACE,
1006	TC_ETS_DESTROY,
1007	TC_ETS_STATS,
1008	TC_ETS_GRAFT,
1009};
1010
1011struct tc_ets_qopt_offload_replace_params {
1012	unsigned int bands;
1013	u8 priomap[TC_PRIO_MAX + 1];
1014	unsigned int quanta[TCQ_ETS_MAX_BANDS];	/* 0 for strict bands. */
1015	unsigned int weights[TCQ_ETS_MAX_BANDS];
1016	struct gnet_stats_queue *qstats;
1017};
1018
1019struct tc_ets_qopt_offload_graft_params {
1020	u8 band;
1021	u32 child_handle;
1022};
1023
1024struct tc_ets_qopt_offload {
1025	enum tc_ets_command command;
1026	u32 handle;
1027	u32 parent;
1028	union {
1029		struct tc_ets_qopt_offload_replace_params replace_params;
1030		struct tc_qopt_offload_stats stats;
1031		struct tc_ets_qopt_offload_graft_params graft_params;
1032	};
1033};
1034
1035enum tc_tbf_command {
1036	TC_TBF_REPLACE,
1037	TC_TBF_DESTROY,
1038	TC_TBF_STATS,
1039	TC_TBF_GRAFT,
1040};
1041
1042struct tc_tbf_qopt_offload_replace_params {
1043	struct psched_ratecfg rate;
1044	u32 max_size;
1045	struct gnet_stats_queue *qstats;
1046};
1047
1048struct tc_tbf_qopt_offload {
1049	enum tc_tbf_command command;
1050	u32 handle;
1051	u32 parent;
1052	union {
1053		struct tc_tbf_qopt_offload_replace_params replace_params;
1054		struct tc_qopt_offload_stats stats;
1055		u32 child_handle;
1056	};
1057};
1058
1059enum tc_fifo_command {
1060	TC_FIFO_REPLACE,
1061	TC_FIFO_DESTROY,
1062	TC_FIFO_STATS,
1063};
1064
1065struct tc_fifo_qopt_offload {
1066	enum tc_fifo_command command;
1067	u32 handle;
1068	u32 parent;
1069	union {
1070		struct tc_qopt_offload_stats stats;
1071	};
1072};
1073
1074#ifdef CONFIG_NET_CLS_ACT
1075DECLARE_STATIC_KEY_FALSE(tc_skb_ext_tc);
1076void tc_skb_ext_tc_enable(void);
1077void tc_skb_ext_tc_disable(void);
1078#define tc_skb_ext_tc_enabled() static_branch_unlikely(&tc_skb_ext_tc)
1079#else /* CONFIG_NET_CLS_ACT */
1080static inline void tc_skb_ext_tc_enable(void) { }
1081static inline void tc_skb_ext_tc_disable(void) { }
1082#define tc_skb_ext_tc_enabled() false
1083#endif
1084
1085#endif