[mirror_ubuntu-zesty-kernel.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);

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 void 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);
	WARN_ON(!exts->actions); /* TODO: propagate the error to callers */
#endif
	exts->action = action;
	exts->police = police;
}

/**
 * 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(&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);

/**
 * 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_should_offload(const struct net_device *dev,
				     const struct tcf_proto *tp, u32 flags)
{
	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 (flags & TCA_CLS_FLAGS_SKIP_HW)
		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_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;
}

enum tc_fl_command {
	TC_CLSFLOWER_REPLACE,
	TC_CLSFLOWER_DESTROY,
	TC_CLSFLOWER_STATS,
};

struct tc_cls_flower_offload {
	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;
};

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;
};

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