linux/net/can/af_can.h

/* SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) */
/* Copyright (c) 2002-2007 Volkswagen Group Electronic Research
 * All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
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 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
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 * 3. Neither the name of Volkswagen nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * Alternatively, provided that this notice is retained in full, this
 * software may be distributed under the terms of the GNU General
 * Public License ("GPL") version 2, in which case the provisions of the
 * GPL apply INSTEAD OF those given above.
 *
 * The provided data structures and external interfaces from this code
 * are not restricted to be used by modules with a GPL compatible license.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#ifndef AF_CAN_H
#define AF_CAN_H

#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/list.h>
#include <linux/rcupdate.h>
#include <linux/can.h>

/* af_can rx dispatcher structures */

struct receiver {
	struct hlist_node list;
	canid_t can_id;
	canid_t mask;
	unsigned long matches;
	void (*func)(struct sk_buff *skb, void *data);
	void *data;
	char *ident;
	struct sock *sk;
	struct rcu_head rcu;
};

#define CAN_SFF_RCV_ARRAY_SZ (1 << CAN_SFF_ID_BITS)
#define CAN_EFF_RCV_HASH_BITS 10
#define CAN_EFF_RCV_ARRAY_SZ (1 << CAN_EFF_RCV_HASH_BITS)

enum { RX_ERR, RX_ALL, RX_FIL, RX_INV, RX_MAX };

/* per device receive filters linked at dev->ml_priv */
struct can_dev_rcv_lists {
	struct hlist_head rx[RX_MAX];
	struct hlist_head rx_sff[CAN_SFF_RCV_ARRAY_SZ];
	struct hlist_head rx_eff[CAN_EFF_RCV_ARRAY_SZ];
	int remove_on_zero_entries;
	int entries;
};

/* statistic structures */

/* can be reset e.g. by can_init_stats() */
struct s_stats {
	unsigned long jiffies_init;

	unsigned long rx_frames;
	unsigned long tx_frames;
	unsigned long matches;

	unsigned long total_rx_rate;
	unsigned long total_tx_rate;
	unsigned long total_rx_match_ratio;

	unsigned long current_rx_rate;
	unsigned long current_tx_rate;
	unsigned long current_rx_match_ratio;

	unsigned long max_rx_rate;
	unsigned long max_tx_rate;
	unsigned long max_rx_match_ratio;

	unsigned long rx_frames_delta;
	unsigned long tx_frames_delta;
	unsigned long matches_delta;
};

/* persistent statistics */
struct s_pstats {
	unsigned long stats_reset;
	unsigned long user_reset;
	unsigned long rcv_entries;
	unsigned long rcv_entries_max;
};

/* function prototypes for the CAN networklayer procfs (proc.c) */
void can_init_proc(struct net *net);
void can_remove_proc(struct net *net);
void can_stat_update(struct timer_list *t);

#endif /* AF_CAN_H */