[linux-block.git] / include / net / pkt_cls.h

#ifndef __NET_PKT_CLS_H
#define __NET_PKT_CLS_H

#include <linux/pkt_cls.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 *, unsigned long node, struct tcf_walker *);
};

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

#ifdef CONFIG_NET_CLS
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;
#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->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;
}

/**
 * tcf_exts_is_predicative - check if a predicative extension is present
 * @exts: tc filter extensions handle
 *
 * Returns 1 if a predicative extension is present, i.e. an extension which
 * might cause further actions and thus overrule the regular tcf_result.
 */
static inline int
tcf_exts_is_predicative(struct tcf_exts *exts)
{
#ifdef CONFIG_NET_CLS_ACT
	return exts->nr_actions;
#else
	return 0;
#endif
}

/**
 * tcf_exts_is_available - check if at least one extension is present
 * @exts: tc filter extensions handle
 *
 * Returns 1 if at least one extension is present.
 */
static inline int
tcf_exts_is_available(struct tcf_exts *exts)
{
	/* All non-predicative extensions must be added here. */
	return tcf_exts_is_predicative(exts);
}

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
}

/**
 * tcf_exts_exec - execute tc filter extensions
 * @skb: socket buffer
 * @exts: tc filter extensions handle
 * @res: desired result
 *
 * Executes all configured extensions. Returns 0 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
	if (exts->nr_actions)
		return tcf_action_exec(skb, exts->actions, exts->nr_actions,
				       res);
#endif
	return 0;
}

#ifdef CONFIG_NET_CLS_ACT

#define tc_no_actions(_exts)  ((_exts)->nr_actions == 0)
#define tc_single_action(_exts) ((_exts)->nr_actions == 1)

#else /* CONFIG_NET_CLS_ACT */

#define tc_no_actions(_exts) true
#define tc_single_action(_exts) false

#endif /* CONFIG_NET_CLS_ACT */

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_proto *tp, 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_change - replace ematch tree of a running classifier
 *
 * @tp: classifier kind handle
 * @dst: destination ematch tree variable
 * @src: source ematch tree (temporary tree from tcf_em_tree_validate)
 *
 * This functions replaces the ematch tree in @dst with the ematch
 * tree in @src. The classifier in charge of the ematch tree may be
 * running.
 */
static inline void tcf_em_tree_change(struct tcf_proto *tp,
				      struct tcf_ematch_tree *dst,
				      struct tcf_ematch_tree *src)
{
	tcf_tree_lock(tp);
	memcpy(dst, src, sizeof(*dst));
	tcf_tree_unlock(tp);
}

/**
 * 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_change(tp, dst, src) do { } while(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_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 {
	/* 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,
				  const struct tcf_proto *tp)
{
	const struct Qdisc *sch = tp->q;
	const struct Qdisc_class_ops *cops = sch->ops->cl_ops;

	if (!(dev->features & NETIF_F_HW_TC))
		return false;
	if (!dev->netdev_ops->ndo_setup_tc)
		return false;
	if (cops && cops->tcf_cl_offload)
		return cops->tcf_cl_offload(tp->classid);

	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,
				     const struct tcf_proto *tp, u32 flags)
{
	if (tc_skip_hw(flags))
		return false;
	return tc_can_offload(dev, tp);
}

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 {
	enum tc_fl_command command;
	u32 prio;
	unsigned long cookie;
	struct flow_dissector *dissector;
	struct fl_flow_key *mask;
	struct fl_flow_key *key;
	struct tcf_exts *exts;
};

enum tc_matchall_command {
	TC_CLSMATCHALL_REPLACE,
	TC_CLSMATCHALL_DESTROY,
};

struct tc_cls_matchall_offload {
	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 {
	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
1da177e4 LT	1	#ifndef __NET_PKT_CLS_H
	2	#define __NET_PKT_CLS_H
	3
	4	#include <linux/pkt_cls.h>
	5	#include <net/sch_generic.h>
	6	#include <net/act_api.h>
	7
	8	/* Basic packet classifier frontend definitions. */
	9
fd2c3ef7	10	struct tcf_walker {
1da177e4 LT	11	int stop;
	12	int skip;
	13	int count;
	14	int (fn)(struct tcf_proto , unsigned long node, struct tcf_walker *);
	15	};
	16
5c15257f JP	17	int register_tcf_proto_ops(struct tcf_proto_ops *ops);
5c15257f JP	18	int unregister_tcf_proto_ops(struct tcf_proto_ops *ops);
1da177e4	19
8ae70032	20	#ifdef CONFIG_NET_CLS
6529eaba JP	21	int tcf_block_get(struct tcf_block **p_block,
	22	struct tcf_proto __rcu **p_filter_chain);
	23	void tcf_block_put(struct tcf_block *block);
87d83093 JP	24	int tcf_classify(struct sk_buff skb, const struct tcf_proto tp,
	25	struct tcf_result *res, bool compat_mode);
	26
8ae70032	27	#else
6529eaba JP	28	static inline
	29	int tcf_block_get(struct tcf_block **p_block,
	30	struct tcf_proto __rcu **p_filter_chain)
	31	{
	32	return 0;
	33	}
	34
	35	static inline void tcf_block_put(struct tcf_block *block)
8ae70032 JP	36	{
8ae70032 JP	37	}
87d83093 JP	38
	39	static inline int tcf_classify(struct sk_buff skb, const struct tcf_proto tp,
	40	struct tcf_result *res, bool compat_mode)
	41	{
	42	return TC_ACT_UNSPEC;
	43	}
8ae70032	44	#endif
cf1facda	45
1da177e4 LT	46	static inline unsigned long
	47	__cls_set_class(unsigned long *clp, unsigned long cl)
	48	{
a0efb80c	49	return xchg(clp, cl);
1da177e4 LT	50	}
	51
	52	static inline unsigned long
	53	cls_set_class(struct tcf_proto tp, unsigned long clp,
	54	unsigned long cl)
	55	{
	56	unsigned long old_cl;
	57
	58	tcf_tree_lock(tp);
	59	old_cl = __cls_set_class(clp, cl);
	60	tcf_tree_unlock(tp);
	61
	62	return old_cl;
	63	}
	64
	65	static inline void
	66	tcf_bind_filter(struct tcf_proto tp, struct tcf_result r, unsigned long base)
	67	{
	68	unsigned long cl;
	69
	70	cl = tp->q->ops->cl_ops->bind_tcf(tp->q, base, r->classid);
	71	cl = cls_set_class(tp, &r->class, cl);
	72	if (cl)
	73	tp->q->ops->cl_ops->unbind_tcf(tp->q, cl);
	74	}
	75
	76	static inline void
	77	tcf_unbind_filter(struct tcf_proto tp, struct tcf_result r)
	78	{
	79	unsigned long cl;
	80
	81	if ((cl = __cls_set_class(&r->class, 0)) != 0)
	82	tp->q->ops->cl_ops->unbind_tcf(tp->q, cl);
	83	}
	84
fd2c3ef7	85	struct tcf_exts {
1da177e4	86	#ifdef CONFIG_NET_CLS_ACT
33be6271	87	__u32 type; /* for backward compat(TCA_OLD_COMPAT) */
22dc13c8 WC	88	int nr_actions;
22dc13c8 WC	89	struct tc_action **actions;
1da177e4	90	#endif
5da57f42 WC	91	/* Map to export classifier specific extension TLV types to the
	92	* generic extensions API. Unsupported extensions must be set to 0.
	93	*/
1da177e4 LT	94	int action;
	95	int police;
	96	};
	97
b9a24bb7	98	static inline int tcf_exts_init(struct tcf_exts *exts, int action, int police)
33be6271 WC	99	{
33be6271 WC	100	#ifdef CONFIG_NET_CLS_ACT
5da57f42	101	exts->type = 0;
22dc13c8 WC	102	exts->nr_actions = 0;
	103	exts->actions = kcalloc(TCA_ACT_MAX_PRIO, sizeof(struct tc_action *),
	104	GFP_KERNEL);
b9a24bb7 WC	105	if (!exts->actions)
b9a24bb7 WC	106	return -ENOMEM;
33be6271	107	#endif
5da57f42 WC	108	exts->action = action;
5da57f42 WC	109	exts->police = police;
b9a24bb7	110	return 0;
33be6271 WC	111	}
33be6271 WC	112
1da177e4 LT	113	/**
	114	* tcf_exts_is_predicative - check if a predicative extension is present
	115	* @exts: tc filter extensions handle
	116	*
	117	* Returns 1 if a predicative extension is present, i.e. an extension which
	118	* might cause further actions and thus overrule the regular tcf_result.
	119	*/
	120	static inline int
	121	tcf_exts_is_predicative(struct tcf_exts *exts)
	122	{
	123	#ifdef CONFIG_NET_CLS_ACT
22dc13c8	124	return exts->nr_actions;
1da177e4 LT	125	#else
	126	return 0;
	127	#endif
	128	}
	129
	130	/**
	131	* tcf_exts_is_available - check if at least one extension is present
	132	* @exts: tc filter extensions handle
	133	*
	134	* Returns 1 if at least one extension is present.
	135	*/
	136	static inline int
	137	tcf_exts_is_available(struct tcf_exts *exts)
	138	{
	139	/* All non-predicative extensions must be added here. */
	140	return tcf_exts_is_predicative(exts);
	141	}
	142
22dc13c8 WC	143	static inline void tcf_exts_to_list(const struct tcf_exts *exts,
	144	struct list_head *actions)
	145	{
	146	#ifdef CONFIG_NET_CLS_ACT
	147	int i;
	148
	149	for (i = 0; i < exts->nr_actions; i++) {
	150	struct tc_action *a = exts->actions[i];
	151
fa5effe7	152	list_add_tail(&a->list, actions);
22dc13c8 WC	153	}
	154	#endif
	155	}
	156
1da177e4 LT	157	/**
	158	* tcf_exts_exec - execute tc filter extensions
	159	* @skb: socket buffer
	160	* @exts: tc filter extensions handle
	161	* @res: desired result
	162	*
	163	* Executes all configured extensions. Returns 0 on a normal execution,
	164	* a negative number if the filter must be considered unmatched or
	165	* a positive action code (TC_ACT_*) which must be returned to the
	166	* underlying layer.
	167	*/
	168	static inline int
	169	tcf_exts_exec(struct sk_buff skb, struct tcf_exts exts,
	170	struct tcf_result *res)
	171	{
	172	#ifdef CONFIG_NET_CLS_ACT
22dc13c8 WC	173	if (exts->nr_actions)
	174	return tcf_action_exec(skb, exts->actions, exts->nr_actions,
	175	res);
1da177e4	176	#endif
1da177e4 LT	177	return 0;
	178	}
	179
2734437e WC	180	#ifdef CONFIG_NET_CLS_ACT
2734437e WC	181
22dc13c8 WC	182	#define tc_no_actions(_exts) ((_exts)->nr_actions == 0)
22dc13c8 WC	183	#define tc_single_action(_exts) ((_exts)->nr_actions == 1)
2734437e WC	184
	185	#else /* CONFIG_NET_CLS_ACT */
	186
	187	#define tc_no_actions(_exts) true
2734437e WC	188	#define tc_single_action(_exts) false
	189
	190	#endif /* CONFIG_NET_CLS_ACT */
	191
5c15257f JP	192	int tcf_exts_validate(struct net net, struct tcf_proto tp,
5c15257f JP	193	struct nlattr *tb, struct nlattr rate_tlv,
2f7ef2f8	194	struct tcf_exts *exts, bool ovr);
18d0264f	195	void tcf_exts_destroy(struct tcf_exts *exts);
5c15257f JP	196	void tcf_exts_change(struct tcf_proto tp, struct tcf_exts dst,
5c15257f JP	197	struct tcf_exts *src);
5da57f42 WC	198	int tcf_exts_dump(struct sk_buff skb, struct tcf_exts exts);
5da57f42 WC	199	int tcf_exts_dump_stats(struct sk_buff skb, struct tcf_exts exts);
7091d8c7 HHZ	200	int tcf_exts_get_dev(struct net_device dev, struct tcf_exts exts,
7091d8c7 HHZ	201	struct net_device **hw_dev);
1da177e4 LT	202
	203	/**
	204	* struct tcf_pkt_info - packet information
	205	*/
fd2c3ef7	206	struct tcf_pkt_info {
1da177e4 LT	207	unsigned char * ptr;
	208	int nexthdr;
	209	};
	210
	211	#ifdef CONFIG_NET_EMATCH
	212
	213	struct tcf_ematch_ops;
	214
	215	/**
	216	* struct tcf_ematch - extended match (ematch)
	217	*
	218	* @matchid: identifier to allow userspace to reidentify a match
	219	* @flags: flags specifying attributes and the relation to other matches
	220	* @ops: the operations lookup table of the corresponding ematch module
	221	* @datalen: length of the ematch specific configuration data
	222	* @data: ematch specific data
	223	*/
fd2c3ef7	224	struct tcf_ematch {
1da177e4 LT	225	struct tcf_ematch_ops * ops;
	226	unsigned long data;
	227	unsigned int datalen;
	228	u16 matchid;
	229	u16 flags;
82a470f1	230	struct net *net;
1da177e4 LT	231	};
	232
	233	static inline int tcf_em_is_container(struct tcf_ematch *em)
	234	{
	235	return !em->ops;
	236	}
	237
	238	static inline int tcf_em_is_simple(struct tcf_ematch *em)
	239	{
	240	return em->flags & TCF_EM_SIMPLE;
	241	}
	242
	243	static inline int tcf_em_is_inverted(struct tcf_ematch *em)
	244	{
	245	return em->flags & TCF_EM_INVERT;
	246	}
	247
	248	static inline int tcf_em_last_match(struct tcf_ematch *em)
	249	{
	250	return (em->flags & TCF_EM_REL_MASK) == TCF_EM_REL_END;
	251	}
	252
	253	static inline int tcf_em_early_end(struct tcf_ematch *em, int result)
	254	{
	255	if (tcf_em_last_match(em))
	256	return 1;
	257
	258	if (result == 0 && em->flags & TCF_EM_REL_AND)
	259	return 1;
	260
	261	if (result != 0 && em->flags & TCF_EM_REL_OR)
	262	return 1;
	263
	264	return 0;
	265	}
	266
	267	/**
	268	* struct tcf_ematch_tree - ematch tree handle
	269	*
	270	* @hdr: ematch tree header supplied by userspace
	271	* @matches: array of ematches
	272	*/
fd2c3ef7	273	struct tcf_ematch_tree {
1da177e4 LT	274	struct tcf_ematch_tree_hdr hdr;
	275	struct tcf_ematch * matches;
	276
	277	};
	278
	279	/**
	280	* struct tcf_ematch_ops - ematch module operations
	281	*
	282	* @kind: identifier (kind) of this ematch module
	283	* @datalen: length of expected configuration data (optional)
	284	* @change: called during validation (optional)
	285	* @match: called during ematch tree evaluation, must return 1/0
	286	* @destroy: called during destroyage (optional)
	287	* @dump: called during dumping process (optional)
	288	* @owner: owner, must be set to THIS_MODULE
	289	* @link: link to previous/next ematch module (internal use)
	290	*/
fd2c3ef7	291	struct tcf_ematch_ops {
1da177e4 LT	292	int kind;
1da177e4 LT	293	int datalen;
82a470f1	294	int (change)(struct net net, void *,
1da177e4 LT	295	int, struct tcf_ematch *);
	296	int (match)(struct sk_buff , struct tcf_ematch *,
	297	struct tcf_pkt_info *);
82a470f1	298	void (destroy)(struct tcf_ematch );
1da177e4 LT	299	int (dump)(struct sk_buff , struct tcf_ematch *);
	300	struct module *owner;
	301	struct list_head link;
	302	};
	303
5c15257f JP	304	int tcf_em_register(struct tcf_ematch_ops *);
	305	void tcf_em_unregister(struct tcf_ematch_ops *);
	306	int tcf_em_tree_validate(struct tcf_proto , struct nlattr ,
	307	struct tcf_ematch_tree *);
82a470f1	308	void tcf_em_tree_destroy(struct tcf_ematch_tree *);
5c15257f JP	309	int tcf_em_tree_dump(struct sk_buff , struct tcf_ematch_tree , int);
	310	int __tcf_em_tree_match(struct sk_buff , struct tcf_ematch_tree ,
	311	struct tcf_pkt_info *);
1da177e4 LT	312
	313	/**
	314	* tcf_em_tree_change - replace ematch tree of a running classifier
	315	*
	316	* @tp: classifier kind handle
	317	* @dst: destination ematch tree variable
	318	* @src: source ematch tree (temporary tree from tcf_em_tree_validate)
	319	*
	320	* This functions replaces the ematch tree in @dst with the ematch
	321	* tree in @src. The classifier in charge of the ematch tree may be
	322	* running.
	323	*/
	324	static inline void tcf_em_tree_change(struct tcf_proto *tp,
	325	struct tcf_ematch_tree *dst,
	326	struct tcf_ematch_tree *src)
	327	{
	328	tcf_tree_lock(tp);
	329	memcpy(dst, src, sizeof(*dst));
	330	tcf_tree_unlock(tp);
	331	}
	332
	333	/**
	334	* tcf_em_tree_match - evaulate an ematch tree
	335	*
	336	* @skb: socket buffer of the packet in question
	337	* @tree: ematch tree to be used for evaluation
	338	* @info: packet information examined by classifier
	339	*
	340	* This function matches @skb against the ematch tree in @tree by going
	341	* through all ematches respecting their logic relations returning
	342	* as soon as the result is obvious.
	343	*
	344	* Returns 1 if the ematch tree as-one matches, no ematches are configured
	345	* or ematch is not enabled in the kernel, otherwise 0 is returned.
	346	*/
	347	static inline int tcf_em_tree_match(struct sk_buff *skb,
	348	struct tcf_ematch_tree *tree,
	349	struct tcf_pkt_info *info)
	350	{
	351	if (tree->hdr.nmatches)
	352	return __tcf_em_tree_match(skb, tree, info);
	353	else
	354	return 1;
	355	}
	356
db3d99c0 PM	357	#define MODULE_ALIAS_TCF_EMATCH(kind) MODULE_ALIAS("ematch-kind-" __stringify(kind))
db3d99c0 PM	358
1da177e4 LT	359	#else /* CONFIG_NET_EMATCH */
1da177e4 LT	360
fd2c3ef7	361	struct tcf_ematch_tree {
1da177e4 LT	362	};
	363
	364	#define tcf_em_tree_validate(tp, tb, t) ((void)(t), 0)
82a470f1	365	#define tcf_em_tree_destroy(t) do { (void)(t); } while(0)
1da177e4 LT	366	#define tcf_em_tree_dump(skb, t, tlv) (0)
	367	#define tcf_em_tree_change(tp, dst, src) do { } while(0)
	368	#define tcf_em_tree_match(skb, t, info) ((void)(info), 1)
	369
	370	#endif /* CONFIG_NET_EMATCH */
	371
	372	static inline unsigned char * tcf_get_base_ptr(struct sk_buff *skb, int layer)
	373	{
	374	switch (layer) {
	375	case TCF_LAYER_LINK:
	376	return skb->data;
	377	case TCF_LAYER_NETWORK:
d56f90a7	378	return skb_network_header(skb);
1da177e4	379	case TCF_LAYER_TRANSPORT:
9c70220b	380	return skb_transport_header(skb);
1da177e4 LT	381	}
	382
	383	return NULL;
	384	}
	385
eddc9ec5 ACM	386	static inline int tcf_valid_offset(const struct sk_buff *skb,
eddc9ec5 ACM	387	const unsigned char *ptr, const int len)
1da177e4	388	{
da521b2c DM	389	return likely((ptr + len) <= skb_tail_pointer(skb) &&
	390	ptr >= skb->head &&
	391	(ptr <= (ptr + len)));
1da177e4 LT	392	}
	393
	394	#ifdef CONFIG_NET_CLS_IND
0eeb8ffc DL	395	#include <net/net_namespace.h>
0eeb8ffc DL	396
1da177e4	397	static inline int
2519a602	398	tcf_change_indev(struct net net, struct nlattr indev_tlv)
1da177e4	399	{
2519a602 WC	400	char indev[IFNAMSIZ];
	401	struct net_device *dev;
	402
add93b61	403	if (nla_strlcpy(indev, indev_tlv, IFNAMSIZ) >= IFNAMSIZ)
1da177e4	404	return -EINVAL;
2519a602 WC	405	dev = __dev_get_by_name(net, indev);
	406	if (!dev)
	407	return -ENODEV;
	408	return dev->ifindex;
1da177e4 LT	409	}
1da177e4 LT	410
2519a602 WC	411	static inline bool
2519a602 WC	412	tcf_match_indev(struct sk_buff *skb, int ifindex)
1da177e4	413	{
2519a602 WC	414	if (!ifindex)
	415	return true;
	416	if (!skb->skb_iif)
	417	return false;
	418	return ifindex == skb->skb_iif;
1da177e4 LT	419	}
	420	#endif /* CONFIG_NET_CLS_IND */
	421
a1b7c5fd JF	422	struct tc_cls_u32_knode {
a1b7c5fd JF	423	struct tcf_exts *exts;
e014860e	424	struct tc_u32_sel *sel;
a1b7c5fd JF	425	u32 handle;
	426	u32 val;
	427	u32 mask;
	428	u32 link_handle;
e014860e	429	u8 fshift;
a1b7c5fd JF	430	};
	431
	432	struct tc_cls_u32_hnode {
	433	u32 handle;
	434	u32 prio;
	435	unsigned int divisor;
	436	};
	437
	438	enum tc_clsu32_command {
	439	TC_CLSU32_NEW_KNODE,
	440	TC_CLSU32_REPLACE_KNODE,
	441	TC_CLSU32_DELETE_KNODE,
	442	TC_CLSU32_NEW_HNODE,
	443	TC_CLSU32_REPLACE_HNODE,
	444	TC_CLSU32_DELETE_HNODE,
	445	};
	446
	447	struct tc_cls_u32_offload {
	448	/* knode values */
	449	enum tc_clsu32_command command;
	450	union {
	451	struct tc_cls_u32_knode knode;
	452	struct tc_cls_u32_hnode hnode;
	453	};
	454	};
	455
55330f05 HHZ	456	static inline bool tc_can_offload(const struct net_device *dev,
55330f05 HHZ	457	const struct tcf_proto *tp)
6843e7a2	458	{
92c075db DB	459	const struct Qdisc *sch = tp->q;
	460	const struct Qdisc_class_ops *cops = sch->ops->cl_ops;
	461
2b6ab0d3 JF	462	if (!(dev->features & NETIF_F_HW_TC))
2b6ab0d3 JF	463	return false;
9e8ce79c JF	464	if (!dev->netdev_ops->ndo_setup_tc)
9e8ce79c JF	465	return false;
92c075db DB	466	if (cops && cops->tcf_cl_offload)
92c075db DB	467	return cops->tcf_cl_offload(tp->classid);
9e8ce79c JF	468
9e8ce79c JF	469	return true;
6843e7a2 JF	470	}
6843e7a2 JF	471
55330f05 HHZ	472	static inline bool tc_skip_hw(u32 flags)
	473	{
	474	return (flags & TCA_CLS_FLAGS_SKIP_HW) ? true : false;
	475	}
	476
	477	static inline bool tc_should_offload(const struct net_device *dev,
	478	const struct tcf_proto *tp, u32 flags)
	479	{
	480	if (tc_skip_hw(flags))
	481	return false;
	482	return tc_can_offload(dev, tp);
	483	}
	484
d34e3e18 SS	485	static inline bool tc_skip_sw(u32 flags)
	486	{
	487	return (flags & TCA_CLS_FLAGS_SKIP_SW) ? true : false;
	488	}
	489
	490	/* SKIP_HW and SKIP_SW are mutually exclusive flags. */
	491	static inline bool tc_flags_valid(u32 flags)
	492	{
	493	if (flags & ~(TCA_CLS_FLAGS_SKIP_HW \| TCA_CLS_FLAGS_SKIP_SW))
	494	return false;
	495
	496	if (!(flags ^ (TCA_CLS_FLAGS_SKIP_HW \| TCA_CLS_FLAGS_SKIP_SW)))
	497	return false;
	498
	499	return true;
	500	}
	501
e696028a OG	502	static inline bool tc_in_hw(u32 flags)
	503	{
	504	return (flags & TCA_CLS_FLAGS_IN_HW) ? true : false;
	505	}
	506
5b33f488 AV	507	enum tc_fl_command {
	508	TC_CLSFLOWER_REPLACE,
	509	TC_CLSFLOWER_DESTROY,
10cbc684	510	TC_CLSFLOWER_STATS,
5b33f488 AV	511	};
	512
	513	struct tc_cls_flower_offload {
	514	enum tc_fl_command command;
69ca05ce	515	u32 prio;
8208d21b	516	unsigned long cookie;
5b33f488 AV	517	struct flow_dissector *dissector;
	518	struct fl_flow_key *mask;
	519	struct fl_flow_key *key;
	520	struct tcf_exts *exts;
	521	};
	522
b87f7936 YG	523	enum tc_matchall_command {
	524	TC_CLSMATCHALL_REPLACE,
	525	TC_CLSMATCHALL_DESTROY,
	526	};
	527
	528	struct tc_cls_matchall_offload {
	529	enum tc_matchall_command command;
	530	struct tcf_exts *exts;
	531	unsigned long cookie;
	532	};
	533
332ae8e2 JK	534	enum tc_clsbpf_command {
	535	TC_CLSBPF_ADD,
	536	TC_CLSBPF_REPLACE,
	537	TC_CLSBPF_DESTROY,
68d64063	538	TC_CLSBPF_STATS,
332ae8e2 JK	539	};
	540
	541	struct tc_cls_bpf_offload {
	542	enum tc_clsbpf_command command;
	543	struct tcf_exts *exts;
	544	struct bpf_prog *prog;
	545	const char *name;
	546	bool exts_integrated;
0d01d45f	547	u32 gen_flags;
332ae8e2 JK	548	};
332ae8e2 JK	549
1045ba77 JHS	550
	551	/* This structure holds cookie structure that is passed from user
	552	* to the kernel for actions and classifiers
	553	*/
	554	struct tc_cookie {
	555	u8 *data;
	556	u32 len;
	557	};
1da177e4	558	#endif