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Current File : /usr/src/kernels/3.10.0-1160.119.1.el7.x86_64/include/net/llc.h
#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;
	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;
	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];
};

static inline
struct hlist_head *llc_sk_dev_hash(struct llc_sap *sap, int ifindex)
{
	return &sap->sk_dev_hash[ifindex % LLC_SK_DEV_HASH_ENTRIES];
}

static inline
u32 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 inline
struct 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;
extern spinlock_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 void 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;
#else
#define llc_sysctl_init() (0)
#define llc_sysctl_exit() do { } while(0)
#endif /* CONFIG_SYSCTL */
#endif /* LLC_H */

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