#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 <linux/rculist_nulls.h>#include <linux/hash.h>#include <linux/jhash.h> #include <linux/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 #define LLC_SK_DEV_HASH_BITS 6#define LLC_SK_DEV_HASH_ENTRIES (1<<LLC_SK_DEV_HASH_BITS) #define LLC_SK_LADDR_HASH_BITS 6#define LLC_SK_LADDR_HASH_ENTRIES (1<<LLC_SK_LADDR_HASH_BITS) /** * 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;	refcount_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;	spinlock_t sk_lock;	int sk_count;	struct hlist_nulls_head sk_laddr_hash[LLC_SK_LADDR_HASH_ENTRIES];	struct hlist_head sk_dev_hash[LLC_SK_DEV_HASH_ENTRIES];	struct rcu_head rcu;}; static inlinestruct hlist_head *llc_sk_dev_hash(struct llc_sap *sap, int ifindex){	return &sap->sk_dev_hash[ifindex % LLC_SK_DEV_HASH_ENTRIES];} static inlineu32 llc_sk_laddr_hashfn(struct llc_sap *sap, const struct llc_addr *laddr){	return hash_32(jhash(laddr->mac, sizeof(laddr->mac), 0),		       LLC_SK_LADDR_HASH_BITS);} static inlinestruct hlist_nulls_head *llc_sk_laddr_hash(struct llc_sap *sap,					   const struct llc_addr *laddr){	return &sap->sk_laddr_hash[llc_sk_laddr_hashfn(sap, laddr)];} #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; int llc_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,	    struct net_device *orig_dev); int llc_mac_hdr_init(struct sk_buff *skb, const unsigned char *sa,		     const unsigned char *da); void llc_add_pack(int type,		  void (*handler)(struct llc_sap *sap, struct sk_buff *skb));void llc_remove_pack(int type); void llc_set_station_handler(void (*handler)(struct sk_buff *skb)); 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){	refcount_inc(&sap->refcnt);} static inline bool llc_sap_hold_safe(struct llc_sap *sap){	return refcount_inc_not_zero(&sap->refcnt);} void llc_sap_close(struct llc_sap *sap); static inline void llc_sap_put(struct llc_sap *sap){	if (refcount_dec_and_test(&sap->refcnt))		llc_sap_close(sap);} struct llc_sap *llc_sap_find(unsigned char sap_value); int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb,			      unsigned char *dmac, unsigned char dsap); void llc_sap_handler(struct llc_sap *sap, struct sk_buff *skb);void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb); void llc_station_init(void);void llc_station_exit(void); #ifdef CONFIG_PROC_FSint llc_proc_init(void);void llc_proc_exit(void);#else#define llc_proc_init()	(0)#define llc_proc_exit()	do { } while(0)#endif /* CONFIG_PROC_FS */#ifdef CONFIG_SYSCTLint llc_sysctl_init(void);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;#else#define llc_sysctl_init() (0)#define llc_sysctl_exit() do { } while(0)#endif /* CONFIG_SYSCTL */#endif /* LLC_H */