1. 根目录:
2. net
3. can
4. af_can.h

/*
 * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
 * All rights reserved.
 *
 * 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
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 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
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 *
 */

#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;
	struct rcu_head rcu;
	canid_t can_id;
	canid_t mask;
	unsigned long matches;
	void (*func)(struct sk_buff *, void *);
	void *data;
	char *ident;
};

#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 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;
};

/* receive filters subscribed for 'all' CAN devices */
extern struct dev_rcv_lists can_rx_alldev_list;

/* function prototypes for the CAN networklayer procfs (proc.c) */
void can_init_proc(void);
void can_remove_proc(void);
void can_stat_update(unsigned long data);

/* structures and variables from af_can.c needed in proc.c for reading */
extern struct timer_list can_stattimer;    /* timer for statistics update */
extern struct s_stats    can_stats;        /* packet statistics */
extern struct s_pstats   can_pstats;       /* receive list statistics */
extern struct hlist_head can_rx_dev_list;  /* rx dispatcher structures */

#endif /* AF_CAN_H */