Release 4.14 include/net/pkt_cls.h

Directory: include/net
/* 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;
}

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

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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;
}
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#endif


static inline unsigned long

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

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Américo Wang 5 20.00% 1 50.00%
Total 25 100.00% 2 100.00%


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;
}

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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);
}

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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);
}

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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;
}

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/* 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
}

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

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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
}

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Américo Wang 64 98.46% 1 50.00%
Hadar Hen Zion 1 1.54% 1 50.00%
Total 65 100.00% 2 100.00%


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
}

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/**
 * 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
}

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Jiri Pirko 7 25.93% 1 33.33%
Américo Wang 3 11.11% 1 33.33%
Total 27 100.00% 3 100.00%

/**
 * 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
}

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Jiri Pirko 25 86.21% 2 66.67%
Américo Wang 4 13.79% 1 33.33%
Total 29 100.00% 3 100.00%

/**
 * 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;
}

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Jiri Pirko 42 91.30% 3 75.00%
Américo Wang 4 8.70% 1 25.00%
Total 46 100.00% 4 100.00%

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;
}

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

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

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

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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;
}
	
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/**
 * 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;
}

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#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;
}

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Total 52 100.00% 3 100.00%



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)));
}

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David S. Miller 48 88.89% 2 50.00%
Arnaldo Carvalho de Melo 6 11.11% 2 50.00%
Total 54 100.00% 4 100.00%

#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;
}

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Américo Wang 34 50.00% 1 25.00%
Thomas Graf 28 41.18% 1 25.00%
Patrick McHardy 6 8.82% 2 50.00%
Total 68 100.00% 4 100.00%


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;
}
Contributors
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Thomas Graf 23 57.50% 1 20.00%
Américo Wang 12 30.00% 1 20.00%
Patrick McHardy 2 5.00% 1 20.00%
Eric Dumazet 2 5.00% 1 20.00%
David S. Miller 1 2.50% 1 20.00%
Total 40 100.00% 5 100.00%

#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;
}

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Total 52 100.00% 3 100.00%


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;
}

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John Fastabend 40 95.24% 3 60.00%
Hadar Hen Zion 1 2.38% 1 20.00%
Daniel Borkmann 1 2.38% 1 20.00%
Total 42 100.00% 5 100.00%



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

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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);
}

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

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Sridhar Samudrala 21 100.00% 1 100.00%
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/* 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;
}

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

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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
Overall Contributors
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David S. Miller 540 25.23% 5 7.25%
Thomas Graf 379 17.71% 5 7.25%
Américo Wang 316 14.77% 11 15.94%
Jiri Pirko 307 14.35% 12 17.39%
John Fastabend 130 6.07% 6 8.70%
Jakub Kiciński 118 5.51% 4 5.80%
Hadar Hen Zion 75 3.50% 3 4.35%
Sridhar Samudrala 65 3.04% 1 1.45%
Linus Torvalds (pre-git) 61 2.85% 1 1.45%
Amir Vadai 43 2.01% 3 4.35%
Yotam Gigi 26 1.21% 1 1.45%
Or Gerlitz 21 0.98% 1 1.45%
Patrick McHardy 18 0.84% 4 5.80%
Jamal Hadi Salim 13 0.61% 1 1.45%
Arnaldo Carvalho de Melo 12 0.56% 4 5.80%
Benjamin LaHaise 5 0.23% 1 1.45%
Denis V. Lunev 3 0.14% 1 1.45%
Cong Wang 3 0.14% 1 1.45%
Eric Dumazet 2 0.09% 1 1.45%
Daniel Borkmann 1 0.05% 1 1.45%
Alexey Dobriyan 1 0.05% 1 1.45%
Greg Kroah-Hartman 1 0.05% 1 1.45%
Total 2140 100.00% 69 100.00%
Directory: include/net

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cregit-Linux how code gets into the kernel

Release 4.14 include/net/pkt_cls.h

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