[GitHub/moto-9609/android_kernel_motorola_exynos9610.git] / include / net / pkt_cls.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __NET_PKT_CLS_H
#define __NET_PKT_CLS_H

#include <linux/pkt_cls.h>
#include <linux/workqueue.h>
#include <net/sch_generic.h>
#include <net/act_api.h>

/* Basic packet classifier frontend definitions. */

struct tcf_walker {
	int	stop;
	int	skip;
	int	count;
	int	(*fn)(struct tcf_proto *, void *node, struct tcf_walker *);
};

int register_tcf_proto_ops(struct tcf_proto_ops *ops);
int unregister_tcf_proto_ops(struct tcf_proto_ops *ops);

bool tcf_queue_work(struct work_struct *work);

#ifdef CONFIG_NET_CLS
struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index,
				bool create);
void tcf_chain_put(struct tcf_chain *chain);
int tcf_block_get(struct tcf_block **p_block,
		  struct tcf_proto __rcu **p_filter_chain);
void tcf_block_put(struct tcf_block *block);
int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
		 struct tcf_result *res, bool compat_mode);

#else
static inline
int tcf_block_get(struct tcf_block **p_block,
		  struct tcf_proto __rcu **p_filter_chain)
{
	return 0;
}

static inline void tcf_block_put(struct tcf_block *block)
{
}

static inline int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
			       struct tcf_result *res, bool compat_mode)
{
	return TC_ACT_UNSPEC;
}
#endif

static inline unsigned long
__cls_set_class(unsigned long *clp, unsigned long cl)
{
	return xchg(clp, cl);
}

static inline unsigned long
cls_set_class(struct tcf_proto *tp, unsigned long *clp, 
	unsigned long cl)
{
	unsigned long old_cl;
	
	tcf_tree_lock(tp);
	old_cl = __cls_set_class(clp, cl);
	tcf_tree_unlock(tp);
 
	return old_cl;
}

static inline void
tcf_bind_filter(struct tcf_proto *tp, struct tcf_result *r, unsigned long base)
{
	unsigned long cl;

	cl = tp->q->ops->cl_ops->bind_tcf(tp->q, base, r->classid);
	cl = cls_set_class(tp, &r->class, cl);
	if (cl)
		tp->q->ops->cl_ops->unbind_tcf(tp->q, cl);
}

static inline void
tcf_unbind_filter(struct tcf_proto *tp, struct tcf_result *r)
{
	unsigned long cl;

	if ((cl = __cls_set_class(&r->class, 0)) != 0)
		tp->q->ops->cl_ops->unbind_tcf(tp->q, cl);
}

struct tcf_exts {
#ifdef CONFIG_NET_CLS_ACT
	__u32	type; /* for backward compat(TCA_OLD_COMPAT) */
	int nr_actions;
	struct tc_action **actions;
	struct net *net;
#endif
	/* Map to export classifier specific extension TLV types to the
	 * generic extensions API. Unsupported extensions must be set to 0.
	 */
	int action;
	int police;
};

static inline int tcf_exts_init(struct tcf_exts *exts, int action, int police)
{
#ifdef CONFIG_NET_CLS_ACT
	exts->type = 0;
	exts->nr_actions = 0;
	exts->net = NULL;
	exts->actions = kcalloc(TCA_ACT_MAX_PRIO, sizeof(struct tc_action *),
				GFP_KERNEL);
	if (!exts->actions)
		return -ENOMEM;
#endif
	exts->action = action;
	exts->police = police;
	return 0;
}

/* Return false if the netns is being destroyed in cleanup_net(). Callers
 * need to do cleanup synchronously in this case, otherwise may race with
 * tc_action_net_exit(). Return true for other cases.
 */
static inline bool tcf_exts_get_net(struct tcf_exts *exts)
{
#ifdef CONFIG_NET_CLS_ACT
	exts->net = maybe_get_net(exts->net);
	return exts->net != NULL;
#else
	return true;
#endif
}

static inline void tcf_exts_put_net(struct tcf_exts *exts)
{
#ifdef CONFIG_NET_CLS_ACT
	if (exts->net)
		put_net(exts->net);
#endif
}

static inline void tcf_exts_to_list(const struct tcf_exts *exts,
				    struct list_head *actions)
{
#ifdef CONFIG_NET_CLS_ACT
	int i;

	for (i = 0; i < exts->nr_actions; i++) {
		struct tc_action *a = exts->actions[i];

		list_add_tail(&a->list, actions);
	}
#endif
}

static inline void
tcf_exts_stats_update(const struct tcf_exts *exts,
		      u64 bytes, u64 packets, u64 lastuse)
{
#ifdef CONFIG_NET_CLS_ACT
	int i;

	preempt_disable();

	for (i = 0; i < exts->nr_actions; i++) {
		struct tc_action *a = exts->actions[i];

		tcf_action_stats_update(a, bytes, packets, lastuse);
	}

	preempt_enable();
#endif
}

/**
 * tcf_exts_has_actions - check if at least one action is present
 * @exts: tc filter extensions handle
 *
 * Returns true if at least one action is present.
 */
static inline bool tcf_exts_has_actions(struct tcf_exts *exts)
{
#ifdef CONFIG_NET_CLS_ACT
	return exts->nr_actions;
#else
	return false;
#endif
}

/**
 * tcf_exts_has_one_action - check if exactly one action is present
 * @exts: tc filter extensions handle
 *
 * Returns true if exactly one action is present.
 */
static inline bool tcf_exts_has_one_action(struct tcf_exts *exts)
{
#ifdef CONFIG_NET_CLS_ACT
	return exts->nr_actions == 1;
#else
	return false;
#endif
}

/**
 * tcf_exts_exec - execute tc filter extensions
 * @skb: socket buffer
 * @exts: tc filter extensions handle
 * @res: desired result
 *
 * Executes all configured extensions. Returns TC_ACT_OK on a normal execution,
 * a negative number if the filter must be considered unmatched or
 * a positive action code (TC_ACT_*) which must be returned to the
 * underlying layer.
 */
static inline int
tcf_exts_exec(struct sk_buff *skb, struct tcf_exts *exts,
	      struct tcf_result *res)
{
#ifdef CONFIG_NET_CLS_ACT
	return tcf_action_exec(skb, exts->actions, exts->nr_actions, res);
#endif
	return TC_ACT_OK;
}

int tcf_exts_validate(struct net *net, struct tcf_proto *tp,
		      struct nlattr **tb, struct nlattr *rate_tlv,
		      struct tcf_exts *exts, bool ovr);
void tcf_exts_destroy(struct tcf_exts *exts);
void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src);
int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts);
int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts);
int tcf_exts_get_dev(struct net_device *dev, struct tcf_exts *exts,
		     struct net_device **hw_dev);

/**
 * struct tcf_pkt_info - packet information
 */
struct tcf_pkt_info {
	unsigned char *		ptr;
	int			nexthdr;
};

#ifdef CONFIG_NET_EMATCH

struct tcf_ematch_ops;

/**
 * struct tcf_ematch - extended match (ematch)
 * 
 * @matchid: identifier to allow userspace to reidentify a match
 * @flags: flags specifying attributes and the relation to other matches
 * @ops: the operations lookup table of the corresponding ematch module
 * @datalen: length of the ematch specific configuration data
 * @data: ematch specific data
 */
struct tcf_ematch {
	struct tcf_ematch_ops * ops;
	unsigned long		data;
	unsigned int		datalen;
	u16			matchid;
	u16			flags;
	struct net		*net;
};

static inline int tcf_em_is_container(struct tcf_ematch *em)
{
	return !em->ops;
}

static inline int tcf_em_is_simple(struct tcf_ematch *em)
{
	return em->flags & TCF_EM_SIMPLE;
}

static inline int tcf_em_is_inverted(struct tcf_ematch *em)
{
	return em->flags & TCF_EM_INVERT;
}

static inline int tcf_em_last_match(struct tcf_ematch *em)
{
	return (em->flags & TCF_EM_REL_MASK) == TCF_EM_REL_END;
}

static inline int tcf_em_early_end(struct tcf_ematch *em, int result)
{
	if (tcf_em_last_match(em))
		return 1;

	if (result == 0 && em->flags & TCF_EM_REL_AND)
		return 1;

	if (result != 0 && em->flags & TCF_EM_REL_OR)
		return 1;

	return 0;
}
	
/**
 * struct tcf_ematch_tree - ematch tree handle
 *
 * @hdr: ematch tree header supplied by userspace
 * @matches: array of ematches
 */
struct tcf_ematch_tree {
	struct tcf_ematch_tree_hdr hdr;
	struct tcf_ematch *	matches;
	
};

/**
 * struct tcf_ematch_ops - ematch module operations
 * 
 * @kind: identifier (kind) of this ematch module
 * @datalen: length of expected configuration data (optional)
 * @change: called during validation (optional)
 * @match: called during ematch tree evaluation, must return 1/0
 * @destroy: called during destroyage (optional)
 * @dump: called during dumping process (optional)
 * @owner: owner, must be set to THIS_MODULE
 * @link: link to previous/next ematch module (internal use)
 */
struct tcf_ematch_ops {
	int			kind;
	int			datalen;
	int			(*change)(struct net *net, void *,
					  int, struct tcf_ematch *);
	int			(*match)(struct sk_buff *, struct tcf_ematch *,
					 struct tcf_pkt_info *);
	void			(*destroy)(struct tcf_ematch *);
	int			(*dump)(struct sk_buff *, struct tcf_ematch *);
	struct module		*owner;
	struct list_head	link;
};

int tcf_em_register(struct tcf_ematch_ops *);
void tcf_em_unregister(struct tcf_ematch_ops *);
int tcf_em_tree_validate(struct tcf_proto *, struct nlattr *,
			 struct tcf_ematch_tree *);
void tcf_em_tree_destroy(struct tcf_ematch_tree *);
int tcf_em_tree_dump(struct sk_buff *, struct tcf_ematch_tree *, int);
int __tcf_em_tree_match(struct sk_buff *, struct tcf_ematch_tree *,
			struct tcf_pkt_info *);

/**
 * tcf_em_tree_match - evaulate an ematch tree
 *
 * @skb: socket buffer of the packet in question
 * @tree: ematch tree to be used for evaluation
 * @info: packet information examined by classifier
 *
 * This function matches @skb against the ematch tree in @tree by going
 * through all ematches respecting their logic relations returning
 * as soon as the result is obvious.
 *
 * Returns 1 if the ematch tree as-one matches, no ematches are configured
 * or ematch is not enabled in the kernel, otherwise 0 is returned.
 */
static inline int tcf_em_tree_match(struct sk_buff *skb,
				    struct tcf_ematch_tree *tree,
				    struct tcf_pkt_info *info)
{
	if (tree->hdr.nmatches)
		return __tcf_em_tree_match(skb, tree, info);
	else
		return 1;
}

#define MODULE_ALIAS_TCF_EMATCH(kind)	MODULE_ALIAS("ematch-kind-" __stringify(kind))

#else /* CONFIG_NET_EMATCH */

struct tcf_ematch_tree {
};

#define tcf_em_tree_validate(tp, tb, t) ((void)(t), 0)
#define tcf_em_tree_destroy(t) do { (void)(t); } while(0)
#define tcf_em_tree_dump(skb, t, tlv) (0)
#define tcf_em_tree_match(skb, t, info) ((void)(info), 1)

#endif /* CONFIG_NET_EMATCH */

static inline unsigned char * tcf_get_base_ptr(struct sk_buff *skb, int layer)
{
	switch (layer) {
		case TCF_LAYER_LINK:
			return skb->data;
		case TCF_LAYER_NETWORK:
			return skb_network_header(skb);
		case TCF_LAYER_TRANSPORT:
			return skb_transport_header(skb);
	}

	return NULL;
}

static inline int tcf_valid_offset(const struct sk_buff *skb,
				   const unsigned char *ptr, const int len)
{
	return likely((ptr + len) <= skb_tail_pointer(skb) &&
		      ptr >= skb->head &&
		      (ptr <= (ptr + len)));
}

#ifdef CONFIG_NET_CLS_IND
#include <net/net_namespace.h>

static inline int
tcf_change_indev(struct net *net, struct nlattr *indev_tlv)
{
	char indev[IFNAMSIZ];
	struct net_device *dev;

	if (nla_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ)
		return -EINVAL;
	dev = __dev_get_by_name(net, indev);
	if (!dev)
		return -ENODEV;
	return dev->ifindex;
}

static inline bool
tcf_match_indev(struct sk_buff *skb, int ifindex)
{
	if (!ifindex)
		return true;
	if  (!skb->skb_iif)
		return false;
	return ifindex == skb->skb_iif;
}
#endif /* CONFIG_NET_CLS_IND */

struct tc_cls_common_offload {
	u32 chain_index;
	__be16 protocol;
	u32 prio;
	u32 classid;
};

static inline void
tc_cls_common_offload_init(struct tc_cls_common_offload *cls_common,
			   const struct tcf_proto *tp)
{
	cls_common->chain_index = tp->chain->index;
	cls_common->protocol = tp->protocol;
	cls_common->prio = tp->prio;
	cls_common->classid = tp->classid;
}

struct tc_cls_u32_knode {
	struct tcf_exts *exts;
	struct tc_u32_sel *sel;
	u32 handle;
	u32 val;
	u32 mask;
	u32 link_handle;
	u8 fshift;
};

struct tc_cls_u32_hnode {
	u32 handle;
	u32 prio;
	unsigned int divisor;
};

enum tc_clsu32_command {
	TC_CLSU32_NEW_KNODE,
	TC_CLSU32_REPLACE_KNODE,
	TC_CLSU32_DELETE_KNODE,
	TC_CLSU32_NEW_HNODE,
	TC_CLSU32_REPLACE_HNODE,
	TC_CLSU32_DELETE_HNODE,
};

struct tc_cls_u32_offload {
	struct tc_cls_common_offload common;
	/* knode values */
	enum tc_clsu32_command command;
	union {
		struct tc_cls_u32_knode knode;
		struct tc_cls_u32_hnode hnode;
	};
};

static inline bool tc_can_offload(const struct net_device *dev)
{
	if (!(dev->features & NETIF_F_HW_TC))
		return false;
	if (!dev->netdev_ops->ndo_setup_tc)
		return false;
	return true;
}

static inline bool tc_skip_hw(u32 flags)
{
	return (flags & TCA_CLS_FLAGS_SKIP_HW) ? true : false;
}

static inline bool tc_should_offload(const struct net_device *dev, u32 flags)
{
	if (tc_skip_hw(flags))
		return false;
	return tc_can_offload(dev);
}

static inline bool tc_skip_sw(u32 flags)
{
	return (flags & TCA_CLS_FLAGS_SKIP_SW) ? true : false;
}

/* SKIP_HW and SKIP_SW are mutually exclusive flags. */
static inline bool tc_flags_valid(u32 flags)
{
	if (flags & ~(TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW))
		return false;

	if (!(flags ^ (TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW)))
		return false;

	return true;
}

static inline bool tc_in_hw(u32 flags)
{
	return (flags & TCA_CLS_FLAGS_IN_HW) ? true : false;
}

enum tc_fl_command {
	TC_CLSFLOWER_REPLACE,
	TC_CLSFLOWER_DESTROY,
	TC_CLSFLOWER_STATS,
};

struct tc_cls_flower_offload {
	struct tc_cls_common_offload common;
	enum tc_fl_command command;
	unsigned long cookie;
	struct flow_dissector *dissector;
	struct fl_flow_key *mask;
	struct fl_flow_key *key;
	struct tcf_exts *exts;
	bool egress_dev;
};

enum tc_matchall_command {
	TC_CLSMATCHALL_REPLACE,
	TC_CLSMATCHALL_DESTROY,
};

struct tc_cls_matchall_offload {
	struct tc_cls_common_offload common;
	enum tc_matchall_command command;
	struct tcf_exts *exts;
	unsigned long cookie;
};

enum tc_clsbpf_command {
	TC_CLSBPF_ADD,
	TC_CLSBPF_REPLACE,
	TC_CLSBPF_DESTROY,
	TC_CLSBPF_STATS,
};

struct tc_cls_bpf_offload {
	struct tc_cls_common_offload common;
	enum tc_clsbpf_command command;
	struct tcf_exts *exts;
	struct bpf_prog *prog;
	const char *name;
	bool exts_integrated;
	u32 gen_flags;
};


/* This structure holds cookie structure that is passed from user
 * to the kernel for actions and classifiers
 */
struct tc_cookie {
	u8  *data;
	u32 len;
};
#endif
Commit	Line	Data
	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
	10	/* Basic packet classifier frontend definitions. */
	11
	12	struct tcf_walker {
	13	int stop;
	14	int skip;
	15	int count;
	16	int (fn)(struct tcf_proto , void node, struct tcf_walker );
	17	};
	18
	19	int register_tcf_proto_ops(struct tcf_proto_ops *ops);
	20	int unregister_tcf_proto_ops(struct tcf_proto_ops *ops);
	21
	22	bool tcf_queue_work(struct work_struct *work);
	23
	24	#ifdef CONFIG_NET_CLS
	25	struct tcf_chain tcf_chain_get(struct tcf_block block, u32 chain_index,
	26	bool create);
	27	void tcf_chain_put(struct tcf_chain *chain);
	28	int tcf_block_get(struct tcf_block **p_block,
	29	struct tcf_proto __rcu **p_filter_chain);
	30	void tcf_block_put(struct tcf_block *block);
	31	int tcf_classify(struct sk_buff skb, const struct tcf_proto tp,
	32	struct tcf_result *res, bool compat_mode);
	33
	34	#else
	35	static inline
	36	int tcf_block_get(struct tcf_block **p_block,
	37	struct tcf_proto __rcu **p_filter_chain)
	38	{
	39	return 0;
	40	}
	41
	42	static inline void tcf_block_put(struct tcf_block *block)
	43	{
	44	}
	45
	46	static inline int tcf_classify(struct sk_buff skb, const struct tcf_proto tp,
	47	struct tcf_result *res, bool compat_mode)
	48	{
	49	return TC_ACT_UNSPEC;
	50	}
	51	#endif
	52
	53	static inline unsigned long
	54	__cls_set_class(unsigned long *clp, unsigned long cl)
	55	{
	56	return xchg(clp, cl);
	57	}
	58
	59	static inline unsigned long
	60	cls_set_class(struct tcf_proto tp, unsigned long clp,
	61	unsigned long cl)
	62	{
	63	unsigned long old_cl;
	64
	65	tcf_tree_lock(tp);
	66	old_cl = __cls_set_class(clp, cl);
	67	tcf_tree_unlock(tp);
	68
	69	return old_cl;
	70	}
	71
	72	static inline void
	73	tcf_bind_filter(struct tcf_proto tp, struct tcf_result r, unsigned long base)
	74	{
	75	unsigned long cl;
	76
	77	cl = tp->q->ops->cl_ops->bind_tcf(tp->q, base, r->classid);
	78	cl = cls_set_class(tp, &r->class, cl);
	79	if (cl)
	80	tp->q->ops->cl_ops->unbind_tcf(tp->q, cl);
	81	}
	82
	83	static inline void
	84	tcf_unbind_filter(struct tcf_proto tp, struct tcf_result r)
	85	{
	86	unsigned long cl;
	87
	88	if ((cl = __cls_set_class(&r->class, 0)) != 0)
	89	tp->q->ops->cl_ops->unbind_tcf(tp->q, cl);
	90	}
	91
	92	struct tcf_exts {
	93	#ifdef CONFIG_NET_CLS_ACT
	94	__u32 type; /* for backward compat(TCA_OLD_COMPAT) */
	95	int nr_actions;
	96	struct tc_action **actions;
	97	struct net *net;
	98	#endif
	99	/* Map to export classifier specific extension TLV types to the
	100	* generic extensions API. Unsupported extensions must be set to 0.
	101	*/
	102	int action;
	103	int police;
	104	};
	105
	106	static inline int tcf_exts_init(struct tcf_exts *exts, int action, int police)
	107	{
	108	#ifdef CONFIG_NET_CLS_ACT
	109	exts->type = 0;
	110	exts->nr_actions = 0;
	111	exts->net = NULL;
	112	exts->actions = kcalloc(TCA_ACT_MAX_PRIO, sizeof(struct tc_action *),
	113	GFP_KERNEL);
	114	if (!exts->actions)
	115	return -ENOMEM;
	116	#endif
	117	exts->action = action;
	118	exts->police = police;
	119	return 0;
	120	}
	121
	122	/* Return false if the netns is being destroyed in cleanup_net(). Callers
	123	* need to do cleanup synchronously in this case, otherwise may race with
	124	* tc_action_net_exit(). Return true for other cases.
	125	*/
	126	static inline bool tcf_exts_get_net(struct tcf_exts *exts)
	127	{
	128	#ifdef CONFIG_NET_CLS_ACT
	129	exts->net = maybe_get_net(exts->net);
	130	return exts->net != NULL;
	131	#else
	132	return true;
	133	#endif
	134	}
	135
	136	static inline void tcf_exts_put_net(struct tcf_exts *exts)
	137	{
	138	#ifdef CONFIG_NET_CLS_ACT
	139	if (exts->net)
	140	put_net(exts->net);
	141	#endif
	142	}
	143
	144	static inline void tcf_exts_to_list(const struct tcf_exts *exts,
	145	struct list_head *actions)
	146	{
	147	#ifdef CONFIG_NET_CLS_ACT
	148	int i;
	149
	150	for (i = 0; i < exts->nr_actions; i++) {
	151	struct tc_action *a = exts->actions[i];
	152
	153	list_add_tail(&a->list, actions);
	154	}
	155	#endif
	156	}
	157
	158	static inline void
	159	tcf_exts_stats_update(const struct tcf_exts *exts,
	160	u64 bytes, u64 packets, u64 lastuse)
	161	{
	162	#ifdef CONFIG_NET_CLS_ACT
	163	int i;
	164
	165	preempt_disable();
	166
	167	for (i = 0; i < exts->nr_actions; i++) {
	168	struct tc_action *a = exts->actions[i];
	169
	170	tcf_action_stats_update(a, bytes, packets, lastuse);
	171	}
	172
	173	preempt_enable();
	174	#endif
	175	}
	176
	177	/**
	178	* tcf_exts_has_actions - check if at least one action is present
	179	* @exts: tc filter extensions handle
	180	*
	181	* Returns true if at least one action is present.
	182	*/
	183	static inline bool tcf_exts_has_actions(struct tcf_exts *exts)
	184	{
	185	#ifdef CONFIG_NET_CLS_ACT
	186	return exts->nr_actions;
	187	#else
	188	return false;
	189	#endif
	190	}
	191
	192	/**
	193	* tcf_exts_has_one_action - check if exactly one action is present
	194	* @exts: tc filter extensions handle
	195	*
	196	* Returns true if exactly one action is present.
	197	*/
	198	static inline bool tcf_exts_has_one_action(struct tcf_exts *exts)
	199	{
	200	#ifdef CONFIG_NET_CLS_ACT
	201	return exts->nr_actions == 1;
	202	#else
	203	return false;
	204	#endif
	205	}
	206
	207	/**
	208	* tcf_exts_exec - execute tc filter extensions
	209	* @skb: socket buffer
	210	* @exts: tc filter extensions handle
	211	* @res: desired result
	212	*
	213	* Executes all configured extensions. Returns TC_ACT_OK on a normal execution,
	214	* a negative number if the filter must be considered unmatched or
	215	* a positive action code (TC_ACT_*) which must be returned to the
	216	* underlying layer.
	217	*/
	218	static inline int
	219	tcf_exts_exec(struct sk_buff skb, struct tcf_exts exts,
	220	struct tcf_result *res)
	221	{
	222	#ifdef CONFIG_NET_CLS_ACT
	223	return tcf_action_exec(skb, exts->actions, exts->nr_actions, res);
	224	#endif
	225	return TC_ACT_OK;
	226	}
	227
	228	int tcf_exts_validate(struct net net, struct tcf_proto tp,
	229	struct nlattr *tb, struct nlattr rate_tlv,
	230	struct tcf_exts *exts, bool ovr);
	231	void tcf_exts_destroy(struct tcf_exts *exts);
	232	void tcf_exts_change(struct tcf_exts dst, struct tcf_exts src);
	233	int tcf_exts_dump(struct sk_buff skb, struct tcf_exts exts);
	234	int tcf_exts_dump_stats(struct sk_buff skb, struct tcf_exts exts);
	235	int tcf_exts_get_dev(struct net_device dev, struct tcf_exts exts,
	236	struct net_device **hw_dev);
	237
	238	/**
	239	* struct tcf_pkt_info - packet information
	240	*/
	241	struct tcf_pkt_info {
	242	unsigned char * ptr;
	243	int nexthdr;
	244	};
	245
	246	#ifdef CONFIG_NET_EMATCH
	247
	248	struct tcf_ematch_ops;
	249
	250	/**
	251	* struct tcf_ematch - extended match (ematch)
	252	*
	253	* @matchid: identifier to allow userspace to reidentify a match
	254	* @flags: flags specifying attributes and the relation to other matches
	255	* @ops: the operations lookup table of the corresponding ematch module
	256	* @datalen: length of the ematch specific configuration data
	257	* @data: ematch specific data
	258	*/
	259	struct tcf_ematch {
	260	struct tcf_ematch_ops * ops;
	261	unsigned long data;
	262	unsigned int datalen;
	263	u16 matchid;
	264	u16 flags;
	265	struct net *net;
	266	};
	267
	268	static inline int tcf_em_is_container(struct tcf_ematch *em)
	269	{
	270	return !em->ops;
	271	}
	272
	273	static inline int tcf_em_is_simple(struct tcf_ematch *em)
	274	{
	275	return em->flags & TCF_EM_SIMPLE;
	276	}
	277
	278	static inline int tcf_em_is_inverted(struct tcf_ematch *em)
	279	{
	280	return em->flags & TCF_EM_INVERT;
	281	}
	282
	283	static inline int tcf_em_last_match(struct tcf_ematch *em)
	284	{
	285	return (em->flags & TCF_EM_REL_MASK) == TCF_EM_REL_END;
	286	}
	287
	288	static inline int tcf_em_early_end(struct tcf_ematch *em, int result)
	289	{
	290	if (tcf_em_last_match(em))
	291	return 1;
	292
	293	if (result == 0 && em->flags & TCF_EM_REL_AND)
	294	return 1;
	295
	296	if (result != 0 && em->flags & TCF_EM_REL_OR)
	297	return 1;
	298
	299	return 0;
	300	}
	301
	302	/**
	303	* struct tcf_ematch_tree - ematch tree handle
	304	*
	305	* @hdr: ematch tree header supplied by userspace
	306	* @matches: array of ematches
	307	*/
	308	struct tcf_ematch_tree {
	309	struct tcf_ematch_tree_hdr hdr;
	310	struct tcf_ematch * matches;
	311
	312	};
	313
	314	/**
	315	* struct tcf_ematch_ops - ematch module operations
	316	*
	317	* @kind: identifier (kind) of this ematch module
	318	* @datalen: length of expected configuration data (optional)
	319	* @change: called during validation (optional)
	320	* @match: called during ematch tree evaluation, must return 1/0
	321	* @destroy: called during destroyage (optional)
	322	* @dump: called during dumping process (optional)
	323	* @owner: owner, must be set to THIS_MODULE
	324	* @link: link to previous/next ematch module (internal use)
	325	*/
	326	struct tcf_ematch_ops {
	327	int kind;
	328	int datalen;
	329	int (change)(struct net net, void *,
	330	int, struct tcf_ematch *);
	331	int (match)(struct sk_buff , struct tcf_ematch *,
	332	struct tcf_pkt_info *);
	333	void (destroy)(struct tcf_ematch );
	334	int (dump)(struct sk_buff , struct tcf_ematch *);
	335	struct module *owner;
	336	struct list_head link;
	337	};
	338
	339	int tcf_em_register(struct tcf_ematch_ops *);
	340	void tcf_em_unregister(struct tcf_ematch_ops *);
	341	int tcf_em_tree_validate(struct tcf_proto , struct nlattr ,
	342	struct tcf_ematch_tree *);
	343	void tcf_em_tree_destroy(struct tcf_ematch_tree *);
	344	int tcf_em_tree_dump(struct sk_buff , struct tcf_ematch_tree , int);
	345	int __tcf_em_tree_match(struct sk_buff , struct tcf_ematch_tree ,
	346	struct tcf_pkt_info *);
	347
	348	/**
	349	* tcf_em_tree_match - evaulate an ematch tree
	350	*
	351	* @skb: socket buffer of the packet in question
	352	* @tree: ematch tree to be used for evaluation
	353	* @info: packet information examined by classifier
	354	*
	355	* This function matches @skb against the ematch tree in @tree by going
	356	* through all ematches respecting their logic relations returning
	357	* as soon as the result is obvious.
	358	*
	359	* Returns 1 if the ematch tree as-one matches, no ematches are configured
	360	* or ematch is not enabled in the kernel, otherwise 0 is returned.
	361	*/
	362	static inline int tcf_em_tree_match(struct sk_buff *skb,
	363	struct tcf_ematch_tree *tree,
	364	struct tcf_pkt_info *info)
	365	{
	366	if (tree->hdr.nmatches)
	367	return __tcf_em_tree_match(skb, tree, info);
	368	else
	369	return 1;
	370	}
	371
	372	#define MODULE_ALIAS_TCF_EMATCH(kind) MODULE_ALIAS("ematch-kind-" __stringify(kind))
	373
	374	#else /* CONFIG_NET_EMATCH */
	375
	376	struct tcf_ematch_tree {
	377	};
	378
	379	#define tcf_em_tree_validate(tp, tb, t) ((void)(t), 0)
	380	#define tcf_em_tree_destroy(t) do { (void)(t); } while(0)
	381	#define tcf_em_tree_dump(skb, t, tlv) (0)
	382	#define tcf_em_tree_match(skb, t, info) ((void)(info), 1)
	383
	384	#endif /* CONFIG_NET_EMATCH */
	385
	386	static inline unsigned char * tcf_get_base_ptr(struct sk_buff *skb, int layer)
	387	{
	388	switch (layer) {
	389	case TCF_LAYER_LINK:
	390	return skb->data;
	391	case TCF_LAYER_NETWORK:
	392	return skb_network_header(skb);
	393	case TCF_LAYER_TRANSPORT:
	394	return skb_transport_header(skb);
	395	}
	396
	397	return NULL;
	398	}
	399
	400	static inline int tcf_valid_offset(const struct sk_buff *skb,
	401	const unsigned char *ptr, const int len)
	402	{
	403	return likely((ptr + len) <= skb_tail_pointer(skb) &&
	404	ptr >= skb->head &&
	405	(ptr <= (ptr + len)));
	406	}
	407
	408	#ifdef CONFIG_NET_CLS_IND
	409	#include <net/net_namespace.h>
	410
	411	static inline int
	412	tcf_change_indev(struct net net, struct nlattr indev_tlv)
	413	{
	414	char indev[IFNAMSIZ];
	415	struct net_device *dev;
	416
	417	if (nla_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ)
	418	return -EINVAL;
	419	dev = __dev_get_by_name(net, indev);
	420	if (!dev)
	421	return -ENODEV;
	422	return dev->ifindex;
	423	}
	424
	425	static inline bool
	426	tcf_match_indev(struct sk_buff *skb, int ifindex)
	427	{
	428	if (!ifindex)
	429	return true;
	430	if (!skb->skb_iif)
	431	return false;
	432	return ifindex == skb->skb_iif;
	433	}
	434	#endif /* CONFIG_NET_CLS_IND */
	435
	436	struct tc_cls_common_offload {
	437	u32 chain_index;
	438	__be16 protocol;
	439	u32 prio;
	440	u32 classid;
	441	};
	442
	443	static inline void
	444	tc_cls_common_offload_init(struct tc_cls_common_offload *cls_common,
	445	const struct tcf_proto *tp)
	446	{
	447	cls_common->chain_index = tp->chain->index;
	448	cls_common->protocol = tp->protocol;
	449	cls_common->prio = tp->prio;
	450	cls_common->classid = tp->classid;
	451	}
	452
	453	struct tc_cls_u32_knode {
	454	struct tcf_exts *exts;
	455	struct tc_u32_sel *sel;
	456	u32 handle;
	457	u32 val;
	458	u32 mask;
	459	u32 link_handle;
	460	u8 fshift;
	461	};
	462
	463	struct tc_cls_u32_hnode {
	464	u32 handle;
	465	u32 prio;
	466	unsigned int divisor;
	467	};
	468
	469	enum tc_clsu32_command {
	470	TC_CLSU32_NEW_KNODE,
	471	TC_CLSU32_REPLACE_KNODE,
	472	TC_CLSU32_DELETE_KNODE,
	473	TC_CLSU32_NEW_HNODE,
	474	TC_CLSU32_REPLACE_HNODE,
	475	TC_CLSU32_DELETE_HNODE,
	476	};
	477
	478	struct tc_cls_u32_offload {
	479	struct tc_cls_common_offload common;
	480	/* knode values */
	481	enum tc_clsu32_command command;
	482	union {
	483	struct tc_cls_u32_knode knode;
	484	struct tc_cls_u32_hnode hnode;
	485	};
	486	};
	487
	488	static inline bool tc_can_offload(const struct net_device *dev)
	489	{
	490	if (!(dev->features & NETIF_F_HW_TC))
	491	return false;
	492	if (!dev->netdev_ops->ndo_setup_tc)
	493	return false;
	494	return true;
	495	}
	496
	497	static inline bool tc_skip_hw(u32 flags)
	498	{
	499	return (flags & TCA_CLS_FLAGS_SKIP_HW) ? true : false;
	500	}
	501
	502	static inline bool tc_should_offload(const struct net_device *dev, u32 flags)
	503	{
	504	if (tc_skip_hw(flags))
	505	return false;
	506	return tc_can_offload(dev);
	507	}
	508
	509	static inline bool tc_skip_sw(u32 flags)
	510	{
	511	return (flags & TCA_CLS_FLAGS_SKIP_SW) ? true : false;
	512	}
	513
	514	/* SKIP_HW and SKIP_SW are mutually exclusive flags. */
	515	static inline bool tc_flags_valid(u32 flags)
	516	{
	517	if (flags & ~(TCA_CLS_FLAGS_SKIP_HW \| TCA_CLS_FLAGS_SKIP_SW))
	518	return false;
	519
	520	if (!(flags ^ (TCA_CLS_FLAGS_SKIP_HW \| TCA_CLS_FLAGS_SKIP_SW)))
	521	return false;
	522
	523	return true;
	524	}
	525
	526	static inline bool tc_in_hw(u32 flags)
	527	{
	528	return (flags & TCA_CLS_FLAGS_IN_HW) ? true : false;
	529	}
	530
	531	enum tc_fl_command {
	532	TC_CLSFLOWER_REPLACE,
	533	TC_CLSFLOWER_DESTROY,
	534	TC_CLSFLOWER_STATS,
	535	};
	536
	537	struct tc_cls_flower_offload {
	538	struct tc_cls_common_offload common;
	539	enum tc_fl_command command;
	540	unsigned long cookie;
	541	struct flow_dissector *dissector;
	542	struct fl_flow_key *mask;
	543	struct fl_flow_key *key;
	544	struct tcf_exts *exts;
	545	bool egress_dev;
	546	};
	547
	548	enum tc_matchall_command {
	549	TC_CLSMATCHALL_REPLACE,
	550	TC_CLSMATCHALL_DESTROY,
	551	};
	552
	553	struct tc_cls_matchall_offload {
	554	struct tc_cls_common_offload common;
	555	enum tc_matchall_command command;
	556	struct tcf_exts *exts;
	557	unsigned long cookie;
	558	};
	559
	560	enum tc_clsbpf_command {
	561	TC_CLSBPF_ADD,
	562	TC_CLSBPF_REPLACE,
	563	TC_CLSBPF_DESTROY,
	564	TC_CLSBPF_STATS,
	565	};
	566
	567	struct tc_cls_bpf_offload {
	568	struct tc_cls_common_offload common;
	569	enum tc_clsbpf_command command;
	570	struct tcf_exts *exts;
	571	struct bpf_prog *prog;
	572	const char *name;
	573	bool exts_integrated;
	574	u32 gen_flags;
	575	};
	576
	577
	578	/* This structure holds cookie structure that is passed from user
	579	* to the kernel for actions and classifiers
	580	*/
	581	struct tc_cookie {
	582	u8 *data;
	583	u32 len;
	584	};
	585	#endif