[GitHub/mt8127/android_kernel_alcatel_ttab.git] / 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 */
Commit	Line	Data
1da177e4 LT	1	#ifndef LLC_H
	2	#define LLC_H
	3	/*
	4	* Copyright (c) 1997 by Procom Technology, Inc.
	5	* 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
	6	*
	7	* This program can be redistributed or modified under the terms of the
	8	* GNU General Public License as published by the Free Software Foundation.
	9	* This program is distributed without any warranty or implied warranty
	10	* of merchantability or fitness for a particular purpose.
	11	*
	12	* See the GNU General Public License for more details.
	13	*/
	14
	15	#include <linux/if.h>
	16	#include <linux/if_ether.h>
	17	#include <linux/list.h>
	18	#include <linux/spinlock.h>
b76f5a84	19	#include <linux/rculist_nulls.h>
52d58aef OP	20	#include <linux/hash.h>
52d58aef OP	21	#include <linux/jhash.h>
1da177e4	22
60063497	23	#include <linux/atomic.h>
6e2144b7	24
1da177e4 LT	25	struct net_device;
	26	struct packet_type;
	27	struct sk_buff;
	28
	29	struct llc_addr {
	30	unsigned char lsap;
	31	unsigned char mac[IFHWADDRLEN];
	32	};
	33
	34	#define LLC_SAP_STATE_INACTIVE 1
	35	#define LLC_SAP_STATE_ACTIVE 2
	36
6d2e3ea2 OP	37	#define LLC_SK_DEV_HASH_BITS 6
	38	#define LLC_SK_DEV_HASH_ENTRIES (1<<LLC_SK_DEV_HASH_BITS)
	39
52d58aef OP	40	#define LLC_SK_LADDR_HASH_BITS 6
	41	#define LLC_SK_LADDR_HASH_ENTRIES (1<<LLC_SK_LADDR_HASH_BITS)
	42
1da177e4 LT	43	/**
	44	* struct llc_sap - Defines the SAP component
	45	*
	46	* @station - station this sap belongs to
	47	* @state - sap state
	48	* @p_bit - only lowest-order bit used
	49	* @f_bit - only lowest-order bit used
	50	* @laddr - SAP value in this 'lsap'
	51	* @node - entry in station sap_list
	52	* @sk_list - LLC sockets this one manages
	53	*/
	54	struct llc_sap {
	55	unsigned char state;
	56	unsigned char p_bit;
	57	unsigned char f_bit;
6e2144b7	58	atomic_t refcnt;
1da177e4 LT	59	int (rcv_func)(struct sk_buff skb,
1da177e4 LT	60	struct net_device *dev,
f2ccd8fa DM	61	struct packet_type *pt,
f2ccd8fa DM	62	struct net_device *orig_dev);
1da177e4 LT	63	struct llc_addr laddr;
1da177e4 LT	64	struct list_head node;
b76f5a84	65	spinlock_t sk_lock;
52d58aef OP	66	int sk_count;
52d58aef OP	67	struct hlist_nulls_head sk_laddr_hash[LLC_SK_LADDR_HASH_ENTRIES];
6d2e3ea2	68	struct hlist_head sk_dev_hash[LLC_SK_DEV_HASH_ENTRIES];
1da177e4 LT	69	};
1da177e4 LT	70
6d2e3ea2 OP	71	static inline
	72	struct hlist_head llc_sk_dev_hash(struct llc_sap sap, int ifindex)
	73	{
	74	return &sap->sk_dev_hash[ifindex % LLC_SK_DEV_HASH_ENTRIES];
	75	}
	76
52d58aef OP	77	static inline
	78	u32 llc_sk_laddr_hashfn(struct llc_sap sap, const struct llc_addr laddr)
	79	{
	80	return hash_32(jhash(laddr->mac, sizeof(laddr->mac), 0),
	81	LLC_SK_LADDR_HASH_BITS);
	82	}
	83
	84	static inline
	85	struct hlist_nulls_head llc_sk_laddr_hash(struct llc_sap sap,
	86	const struct llc_addr *laddr)
	87	{
	88	return &sap->sk_laddr_hash[llc_sk_laddr_hashfn(sap, laddr)];
	89	}
6d2e3ea2	90
1da177e4 LT	91	#define LLC_DEST_INVALID 0 /* Invalid LLC PDU type */
	92	#define LLC_DEST_SAP 1 /* Type 1 goes here */
	93	#define LLC_DEST_CONN 2 /* Type 2 goes here */
	94
	95	extern struct list_head llc_sap_list;
8beb9ab6	96	extern spinlock_t llc_sap_list_lock;
1da177e4 LT	97
1da177e4 LT	98	extern int llc_rcv(struct sk_buff skb, struct net_device dev,
f2ccd8fa	99	struct packet_type pt, struct net_device orig_dev);
1da177e4 LT	100
1da177e4 LT	101	extern int llc_mac_hdr_init(struct sk_buff *skb,
f4ad2b16	102	const unsigned char sa, const unsigned char da);
1da177e4 LT	103
	104	extern void llc_add_pack(int type, void (handler)(struct llc_sap sap,
	105	struct sk_buff *skb));
	106	extern void llc_remove_pack(int type);
	107
	108	extern void llc_set_station_handler(void (handler)(struct sk_buff skb));
	109
	110	extern struct llc_sap *llc_sap_open(unsigned char lsap,
	111	int (rcv)(struct sk_buff skb,
	112	struct net_device *dev,
f2ccd8fa DM	113	struct packet_type *pt,
f2ccd8fa DM	114	struct net_device *orig_dev));
6e2144b7 ACM	115	static inline void llc_sap_hold(struct llc_sap *sap)
	116	{
	117	atomic_inc(&sap->refcnt);
	118	}
	119
2928c19e ACM	120	extern void llc_sap_close(struct llc_sap *sap);
2928c19e ACM	121
6e2144b7 ACM	122	static inline void llc_sap_put(struct llc_sap *sap)
6e2144b7 ACM	123	{
6e2144b7 ACM	124	if (atomic_dec_and_test(&sap->refcnt))
	125	llc_sap_close(sap);
	126	}
1da177e4 LT	127
	128	extern struct llc_sap *llc_sap_find(unsigned char sap_value);
	129
	130	extern int llc_build_and_send_ui_pkt(struct llc_sap sap, struct sk_buff skb,
	131	unsigned char *dmac, unsigned char dsap);
	132
2928c19e ACM	133	extern void llc_sap_handler(struct llc_sap sap, struct sk_buff skb);
	134	extern void llc_conn_handler(struct llc_sap sap, struct sk_buff skb);
	135
6024935f	136	extern void llc_station_init(void);
1da177e4 LT	137	extern void llc_station_exit(void);
	138
	139	#ifdef CONFIG_PROC_FS
	140	extern int llc_proc_init(void);
	141	extern void llc_proc_exit(void);
	142	#else
	143	#define llc_proc_init() (0)
	144	#define llc_proc_exit() do { } while(0)
	145	#endif /* CONFIG_PROC_FS */
590232a7 ACM	146	#ifdef CONFIG_SYSCTL
	147	extern int llc_sysctl_init(void);
	148	extern void llc_sysctl_exit(void);
2928c19e ACM	149
	150	extern int sysctl_llc2_ack_timeout;
	151	extern int sysctl_llc2_busy_timeout;
	152	extern int sysctl_llc2_p_timeout;
	153	extern int sysctl_llc2_rej_timeout;
590232a7 ACM	154	#else
	155	#define llc_sysctl_init() (0)
	156	#define llc_sysctl_exit() do { } while(0)
	157	#endif /* CONFIG_SYSCTL */
1da177e4	158	#endif /* LLC_H */