path: root/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>
#include <net/net_namespace.h>

/* TC action not accessible from user space */
#define TC_ACT_CONSUMED		(TC_ACT_VALUE_MAX + 1)

/* Basic packet classifier frontend definitions. */

struct tcf_walker {
	int	stop;
	int	skip;
	int	count;
	bool	nonempty;
	unsigned long cookie;
	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);

struct tcf_block_ext_info {
	enum flow_block_binder_type binder_type;
	tcf_chain_head_change_t *chain_head_change;
	void *chain_head_change_priv;
	u32 block_index;
};

struct tcf_qevent {
	struct tcf_block	*block;
	struct tcf_block_ext_info info;
	struct tcf_proto __rcu *filter_chain;
};

struct tcf_block_cb;
bool tcf_queue_work(struct rcu_work *rwork, work_func_t func);

#ifdef CONFIG_NET_CLS
struct tcf_chain *tcf_chain_get_by_act(struct tcf_block *block,
				       u32 chain_index);
void tcf_chain_put_by_act(struct tcf_chain *chain);
struct tcf_chain *tcf_get_next_chain(struct tcf_block *block,
				     struct tcf_chain *chain);
struct tcf_proto *tcf_get_next_proto(struct tcf_chain *chain,
				     struct tcf_proto *tp);
void tcf_block_netif_keep_dst(struct tcf_block *block);
int tcf_block_get(struct tcf_block **p_block,
		  struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q,
		  struct netlink_ext_ack *extack);
int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q,
		      struct tcf_block_ext_info *ei,
		      struct netlink_ext_ack *extack);
void tcf_block_put(struct tcf_block *block);
void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q,
		       struct tcf_block_ext_info *ei);

static inline bool tcf_block_shared(struct tcf_block *block)
{
	return block->index;
}

static inline bool tcf_block_non_null_shared(struct tcf_block *block)
{
	return block && block->index;
}

static inline struct Qdisc *tcf_block_q(struct tcf_block *block)
{
	WARN_ON(tcf_block_shared(block));
	return block->q;
}

int tcf_classify(struct sk_buff *skb,
		 const struct tcf_block *block,
		 const struct tcf_proto *tp, struct tcf_result *res,
		 bool compat_mode);

#else
static inline bool tcf_block_shared(struct tcf_block *block)
{
	return false;
}

static inline bool tcf_block_non_null_shared(struct tcf_block *block)
{
	return false;
}

static inline
int tcf_block_get(struct tcf_block **p_block,
		  struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q,
		  struct netlink_ext_ack *extack)
{
	return 0;
}

static inline
int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q,
		      struct tcf_block_ext_info *ei,
		      struct netlink_ext_ack *extack)
{
	return 0;
}

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

static inline
void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q,
		       struct tcf_block_ext_info *ei)
{
}

static inline struct Qdisc *tcf_block_q(struct tcf_block *block)
{
	return NULL;
}

static inline
int tc_setup_cb_block_register(struct tcf_block *block, flow_setup_cb_t *cb,
			       void *cb_priv)
{
	return 0;
}

static inline
void tc_setup_cb_block_unregister(struct tcf_block *block, flow_setup_cb_t *cb,
				  void *cb_priv)
{
}

static inline int tcf_classify(struct sk_buff *skb,
			       const struct tcf_block *block,
			       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 void
__tcf_bind_filter(struct Qdisc *q, struct tcf_result *r, unsigned long base)
{
	unsigned long cl;

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

static inline void
tcf_bind_filter(struct tcf_proto *tp, struct tcf_result *r, unsigned long base)
{
	struct Qdisc *q = tp->chain->block->q;

	/* Check q as it is not set for shared blocks. In that case,
	 * setting class is not supported.
	 */
	if (!q)
		return;
	sch_tree_lock(q);
	__tcf_bind_filter(q, r, base);
	sch_tree_unlock(q);
}

static inline void
__tcf_unbind_filter(struct Qdisc *q, struct tcf_result *r)
{
	unsigned long cl;

	if ((cl