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#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 unsigned char llc_station_mac_sa[ETH_ALEN];
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,
unsigned char *sa, 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);
}
static inline void llc_sap_put(struct llc_sap *sap)
{
extern void llc_sap_close(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 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);
#else
#define llc_sysctl_init() (0)
#define llc_sysctl_exit() do { } while(0)
#endif /* CONFIG_SYSCTL */
#endif /* LLC_H */
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