root/include/net/llc.h

INCLUDED FROM

DEFINITIONS

1. llc_sap_hold
2. llc_sap_put

#ifndef LLC_H
#define LLC_H
/*
 * Copyright (c) 1997 by Procom Technology, Inc.
 *               2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
 *
 * This program can be redistributed or modified under the terms of the
 * GNU General Public License as published by the Free Software Foundation.
 * This program is distributed without any warranty or implied warranty
 * of merchantability or fitness for a particular purpose.
 *
 * See the GNU General Public License for more details.
 */

#include <linux/if.h>
#include <linux/if_ether.h>
#include <linux/list.h>
#include <linux/spinlock.h>

#include <asm/atomic.h>

struct net_device;
struct packet_type;
struct sk_buff;

struct llc_addr {
        unsigned char lsap;
        unsigned char mac[IFHWADDRLEN];
};

#define LLC_SAP_STATE_INACTIVE  1
#define LLC_SAP_STATE_ACTIVE    2

/**
 * struct llc_sap - Defines the SAP component
 *
 * @station - station this sap belongs to
 * @state - sap state
 * @p_bit - only lowest-order bit used
 * @f_bit - only lowest-order bit used
 * @laddr - SAP value in this 'lsap'
 * @node - entry in station sap_list
 * @sk_list - LLC sockets this one manages
 */
struct llc_sap {
        unsigned char    state;
        unsigned char    p_bit;
        unsigned char    f_bit;
        atomic_t         refcnt;
        int              (*rcv_func)(struct sk_buff *skb,
                                     struct net_device *dev,
                                     struct packet_type *pt,
                                     struct net_device *orig_dev);
        struct llc_addr  laddr;
        struct list_head node;
        struct {
                rwlock_t          lock;
                struct hlist_head list;
        } sk_list;
};

#define LLC_DEST_INVALID         0      /* Invalid LLC PDU type */
#define LLC_DEST_SAP             1      /* Type 1 goes here */
#define LLC_DEST_CONN            2      /* Type 2 goes here */

extern struct list_head llc_sap_list;
extern rwlock_t llc_sap_list_lock;

extern int llc_rcv(struct sk_buff *skb, struct net_device *dev,
                   struct packet_type *pt, struct net_device *orig_dev);

extern int llc_mac_hdr_init(struct sk_buff *skb,
                            const unsigned char *sa, const unsigned char *da);

extern void llc_add_pack(int type, void (*handler)(struct llc_sap *sap,
                                                   struct sk_buff *skb));
extern void llc_remove_pack(int type);

extern void llc_set_station_handler(void (*handler)(struct sk_buff *skb));

extern struct llc_sap *llc_sap_open(unsigned char lsap,
                                    int (*rcv)(struct sk_buff *skb,
                                               struct net_device *dev,
                                               struct packet_type *pt,
                                               struct net_device *orig_dev));
static inline void llc_sap_hold(struct llc_sap *sap)
{
        atomic_inc(&sap->refcnt);
}

extern void llc_sap_close(struct llc_sap *sap);

static inline void llc_sap_put(struct llc_sap *sap)
{
        if (atomic_dec_and_test(&sap->refcnt))
                llc_sap_close(sap);
}

extern struct llc_sap *llc_sap_find(unsigned char sap_value);

extern int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb,
                                     unsigned char *dmac, unsigned char dsap);

extern void llc_sap_handler(struct llc_sap *sap, struct sk_buff *skb);
extern void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb);

extern int llc_station_init(void);
extern void llc_station_exit(void);

#ifdef CONFIG_PROC_FS
extern int llc_proc_init(void);
extern void llc_proc_exit(void);
#else
#define llc_proc_init() (0)
#define llc_proc_exit() do { } while(0)
#endif /* CONFIG_PROC_FS */
#ifdef CONFIG_SYSCTL
extern int llc_sysctl_init(void);
extern void llc_sysctl_exit(void);

extern int sysctl_llc2_ack_timeout;
extern int sysctl_llc2_busy_timeout;
extern int sysctl_llc2_p_timeout;
extern int sysctl_llc2_rej_timeout;
extern int sysctl_llc_station_ack_timeout;
#else
#define llc_sysctl_init() (0)
#define llc_sysctl_exit() do { } while(0)
#endif /* CONFIG_SYSCTL */
#endif /* LLC_H */