[linux.git] / include / net / dn_nsp.h

#ifndef _NET_DN_NSP_H
#define _NET_DN_NSP_H
/******************************************************************************
    (c) 1995-1998 E.M. Serrat		[email protected]
    
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
*******************************************************************************/
/* dn_nsp.c functions prototyping */

extern void dn_nsp_send_data_ack(struct sock *sk);
extern void dn_nsp_send_oth_ack(struct sock *sk);
extern void dn_nsp_delayed_ack(struct sock *sk);
extern void dn_send_conn_ack(struct sock *sk);
extern void dn_send_conn_conf(struct sock *sk, gfp_t gfp);
extern void dn_nsp_send_disc(struct sock *sk, unsigned char type, 
			unsigned short reason, gfp_t gfp);
extern void dn_nsp_return_disc(struct sk_buff *skb, unsigned char type,
				unsigned short reason);
extern void dn_nsp_send_link(struct sock *sk, unsigned char lsflags, char fcval);
extern void dn_nsp_send_conninit(struct sock *sk, unsigned char flags);

extern void dn_nsp_output(struct sock *sk);
extern int dn_nsp_check_xmit_queue(struct sock *sk, struct sk_buff *skb, struct sk_buff_head *q, unsigned short acknum);
extern void dn_nsp_queue_xmit(struct sock *sk, struct sk_buff *skb, gfp_t gfp, int oob);
extern unsigned long dn_nsp_persist(struct sock *sk);
extern int dn_nsp_xmit_timeout(struct sock *sk);

extern int dn_nsp_rx(struct sk_buff *);
extern int dn_nsp_backlog_rcv(struct sock *sk, struct sk_buff *skb);

extern struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri);
extern struct sk_buff *dn_alloc_send_skb(struct sock *sk, size_t *size, int noblock, long timeo, int *err);

#define NSP_REASON_OK 0		/* No error */
#define NSP_REASON_NR 1		/* No resources */
#define NSP_REASON_UN 2		/* Unrecognised node name */
#define NSP_REASON_SD 3		/* Node shutting down */
#define NSP_REASON_ID 4		/* Invalid destination end user */
#define NSP_REASON_ER 5		/* End user lacks resources */
#define NSP_REASON_OB 6		/* Object too busy */
#define NSP_REASON_US 7		/* Unspecified error */
#define NSP_REASON_TP 8		/* Third-Party abort */
#define NSP_REASON_EA 9		/* End user has aborted the link */
#define NSP_REASON_IF 10	/* Invalid node name format */
#define NSP_REASON_LS 11	/* Local node shutdown */
#define NSP_REASON_LL 32	/* Node lacks logical-link resources */
#define NSP_REASON_LE 33	/* End user lacks logical-link resources */
#define NSP_REASON_UR 34	/* Unacceptable RQSTRID or PASSWORD field */
#define NSP_REASON_UA 36	/* Unacceptable ACCOUNT field */
#define NSP_REASON_TM 38	/* End user timed out logical link */
#define NSP_REASON_NU 39	/* Node unreachable */
#define NSP_REASON_NL 41	/* No-link message */
#define NSP_REASON_DC 42	/* Disconnect confirm */
#define NSP_REASON_IO 43	/* Image data field overflow */

#define NSP_DISCINIT 0x38
#define NSP_DISCCONF 0x48

/*------------------------- NSP - messages ------------------------------*/
/* Data Messages */
/*---------------*/

/* Data Messages    (data segment/interrupt/link service)               */

struct nsp_data_seg_msg {
	__u8   msgflg;
	__le16 dstaddr;
	__le16 srcaddr;
} __packed;

struct nsp_data_opt_msg {
	__le16 acknum;
	__le16 segnum;
	__le16 lsflgs;
} __packed;

struct nsp_data_opt_msg1 {
	__le16 acknum;
	__le16 segnum;
} __packed;


/* Acknowledgment Message (data/other data)                             */
struct nsp_data_ack_msg {
	__u8   msgflg;
	__le16 dstaddr;
	__le16 srcaddr;
	__le16 acknum;
} __packed;

/* Connect Acknowledgment Message */
struct  nsp_conn_ack_msg {
	__u8 msgflg;
	__le16 dstaddr;
} __packed;


/* Connect Initiate/Retransmit Initiate/Connect Confirm */
struct  nsp_conn_init_msg {
	__u8   msgflg;
#define NSP_CI      0x18            /* Connect Initiate     */
#define NSP_RCI     0x68            /* Retrans. Conn Init   */
	__le16 dstaddr;
	__le16 srcaddr;
	__u8   services;
#define NSP_FC_NONE   0x00            /* Flow Control None    */
#define NSP_FC_SRC    0x04            /* Seg Req. Count       */
#define NSP_FC_SCMC   0x08            /* Sess. Control Mess   */
#define NSP_FC_MASK   0x0c            /* FC type mask         */
	__u8   info;
	__le16 segsize;
} __packed;

/* Disconnect Initiate/Disconnect Confirm */
struct  nsp_disconn_init_msg {
	__u8   msgflg;
	__le16 dstaddr;
	__le16 srcaddr;
	__le16 reason;
} __packed;


struct  srcobj_fmt {
	__u8   format;
	__u8   task;
	__le16 grpcode;
	__le16 usrcode;
	__u8   dlen;
} __packed;

/*
 * A collection of functions for manipulating the sequence
 * numbers used in NSP. Similar in operation to the functions
 * of the same name in TCP.
 */
static __inline__ int dn_before(__u16 seq1, __u16 seq2)
{
        seq1 &= 0x0fff;
        seq2 &= 0x0fff;

        return (int)((seq1 - seq2) & 0x0fff) > 2048;
}


static __inline__ int dn_after(__u16 seq1, __u16 seq2)
{
        seq1 &= 0x0fff;
        seq2 &= 0x0fff;

        return (int)((seq2 - seq1) & 0x0fff) > 2048;
}

static __inline__ int dn_equal(__u16 seq1, __u16 seq2)
{
        return ((seq1 ^ seq2) & 0x0fff) == 0;
}

static __inline__ int dn_before_or_equal(__u16 seq1, __u16 seq2)
{
	return (dn_before(seq1, seq2) || dn_equal(seq1, seq2));
}

static __inline__ void seq_add(__u16 *seq, __u16 off)
{
        (*seq) += off;
        (*seq) &= 0x0fff;
}

static __inline__ int seq_next(__u16 seq1, __u16 seq2)
{
	return dn_equal(seq1 + 1, seq2);
}

/*
 * Can we delay the ack ?
 */
static __inline__ int sendack(__u16 seq)
{
        return (int)((seq & 0x1000) ? 0 : 1);
}

/*
 * Is socket congested ?
 */
static __inline__ int dn_congested(struct sock *sk)
{
        return atomic_read(&sk->sk_rmem_alloc) > (sk->sk_rcvbuf >> 1);
}

#define DN_MAX_NSP_DATA_HEADER (11)

#endif /* _NET_DN_NSP_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _NET_DN_NSP_H
	2	#define _NET_DN_NSP_H
	3	/******************************************************************************
	4	(c) 1995-1998 E.M. Serrat [email protected]
	5
	6	This program is free software; you can redistribute it and/or modify
	7	it under the terms of the GNU General Public License as published by
	8	the Free Software Foundation; either version 2 of the License, or
	9	any later version.
	10
	11	This program is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
	15	*******************************************************************************/
	16	/* dn_nsp.c functions prototyping */
	17
	18	extern void dn_nsp_send_data_ack(struct sock *sk);
	19	extern void dn_nsp_send_oth_ack(struct sock *sk);
	20	extern void dn_nsp_delayed_ack(struct sock *sk);
	21	extern void dn_send_conn_ack(struct sock *sk);
dd0fc66f	22	extern void dn_send_conn_conf(struct sock *sk, gfp_t gfp);
1da177e4	23	extern void dn_nsp_send_disc(struct sock *sk, unsigned char type,
dd0fc66f	24	unsigned short reason, gfp_t gfp);
1da177e4 LT	25	extern void dn_nsp_return_disc(struct sk_buff *skb, unsigned char type,
	26	unsigned short reason);
	27	extern void dn_nsp_send_link(struct sock *sk, unsigned char lsflags, char fcval);
	28	extern void dn_nsp_send_conninit(struct sock *sk, unsigned char flags);
	29
	30	extern void dn_nsp_output(struct sock *sk);
	31	extern int dn_nsp_check_xmit_queue(struct sock sk, struct sk_buff skb, struct sk_buff_head *q, unsigned short acknum);
dd0fc66f	32	extern void dn_nsp_queue_xmit(struct sock sk, struct sk_buff skb, gfp_t gfp, int oob);
1da177e4 LT	33	extern unsigned long dn_nsp_persist(struct sock *sk);
	34	extern int dn_nsp_xmit_timeout(struct sock *sk);
	35
	36	extern int dn_nsp_rx(struct sk_buff *);
	37	extern int dn_nsp_backlog_rcv(struct sock sk, struct sk_buff skb);
	38
dd0fc66f	39	extern struct sk_buff dn_alloc_skb(struct sock sk, int size, gfp_t pri);
1da177e4 LT	40	extern struct sk_buff dn_alloc_send_skb(struct sock sk, size_t size, int noblock, long timeo, int err);
	41
	42	#define NSP_REASON_OK 0 /* No error */
	43	#define NSP_REASON_NR 1 /* No resources */
	44	#define NSP_REASON_UN 2 /* Unrecognised node name */
	45	#define NSP_REASON_SD 3 /* Node shutting down */
	46	#define NSP_REASON_ID 4 /* Invalid destination end user */
	47	#define NSP_REASON_ER 5 /* End user lacks resources */
	48	#define NSP_REASON_OB 6 /* Object too busy */
	49	#define NSP_REASON_US 7 /* Unspecified error */
	50	#define NSP_REASON_TP 8 /* Third-Party abort */
	51	#define NSP_REASON_EA 9 /* End user has aborted the link */
	52	#define NSP_REASON_IF 10 /* Invalid node name format */
	53	#define NSP_REASON_LS 11 /* Local node shutdown */
	54	#define NSP_REASON_LL 32 /* Node lacks logical-link resources */
	55	#define NSP_REASON_LE 33 /* End user lacks logical-link resources */
	56	#define NSP_REASON_UR 34 /* Unacceptable RQSTRID or PASSWORD field */
	57	#define NSP_REASON_UA 36 /* Unacceptable ACCOUNT field */
	58	#define NSP_REASON_TM 38 /* End user timed out logical link */
	59	#define NSP_REASON_NU 39 /* Node unreachable */
	60	#define NSP_REASON_NL 41 /* No-link message */
	61	#define NSP_REASON_DC 42 /* Disconnect confirm */
	62	#define NSP_REASON_IO 43 /* Image data field overflow */
	63
	64	#define NSP_DISCINIT 0x38
	65	#define NSP_DISCCONF 0x48
	66
	67	/------------------------- NSP - messages ------------------------------/
	68	/* Data Messages */
	69	/---------------/
	70
	71	/* Data Messages (data segment/interrupt/link service) */
	72
fd2c3ef7	73	struct nsp_data_seg_msg {
c4ea94ab SW	74	__u8 msgflg;
	75	__le16 dstaddr;
	76	__le16 srcaddr;
bc10502d	77	} __packed;
1da177e4	78
fd2c3ef7	79	struct nsp_data_opt_msg {
c4ea94ab SW	80	__le16 acknum;
	81	__le16 segnum;
	82	__le16 lsflgs;
bc10502d	83	} __packed;
1da177e4	84
fd2c3ef7	85	struct nsp_data_opt_msg1 {
c4ea94ab SW	86	__le16 acknum;
c4ea94ab SW	87	__le16 segnum;
bc10502d	88	} __packed;
1da177e4 LT	89
	90
	91	/* Acknowledgment Message (data/other data) */
fd2c3ef7	92	struct nsp_data_ack_msg {
c4ea94ab SW	93	__u8 msgflg;
	94	__le16 dstaddr;
	95	__le16 srcaddr;
	96	__le16 acknum;
bc10502d	97	} __packed;
1da177e4 LT	98
1da177e4 LT	99	/* Connect Acknowledgment Message */
fd2c3ef7	100	struct nsp_conn_ack_msg {
c4ea94ab SW	101	__u8 msgflg;
c4ea94ab SW	102	__le16 dstaddr;
bc10502d	103	} __packed;
1da177e4 LT	104
	105
	106	/* Connect Initiate/Retransmit Initiate/Connect Confirm */
fd2c3ef7	107	struct nsp_conn_init_msg {
c4ea94ab	108	__u8 msgflg;
1da177e4 LT	109	#define NSP_CI 0x18 /* Connect Initiate */
1da177e4 LT	110	#define NSP_RCI 0x68 /* Retrans. Conn Init */
c4ea94ab SW	111	__le16 dstaddr;
	112	__le16 srcaddr;
	113	__u8 services;
1da177e4 LT	114	#define NSP_FC_NONE 0x00 /* Flow Control None */
	115	#define NSP_FC_SRC 0x04 /* Seg Req. Count */
	116	#define NSP_FC_SCMC 0x08 /* Sess. Control Mess */
	117	#define NSP_FC_MASK 0x0c /* FC type mask */
c4ea94ab SW	118	__u8 info;
c4ea94ab SW	119	__le16 segsize;
bc10502d	120	} __packed;
1da177e4 LT	121
1da177e4 LT	122	/* Disconnect Initiate/Disconnect Confirm */
fd2c3ef7	123	struct nsp_disconn_init_msg {
c4ea94ab SW	124	__u8 msgflg;
	125	__le16 dstaddr;
	126	__le16 srcaddr;
	127	__le16 reason;
bc10502d	128	} __packed;
1da177e4 LT	129
	130
	131
fd2c3ef7	132	struct srcobj_fmt {
c4ea94ab SW	133	__u8 format;
	134	__u8 task;
	135	__le16 grpcode;
	136	__le16 usrcode;
	137	__u8 dlen;
bc10502d	138	} __packed;
1da177e4 LT	139
	140	/*
	141	* A collection of functions for manipulating the sequence
	142	* numbers used in NSP. Similar in operation to the functions
	143	* of the same name in TCP.
	144	*/
c4ea94ab	145	static __inline__ int dn_before(__u16 seq1, __u16 seq2)
1da177e4 LT	146	{
	147	seq1 &= 0x0fff;
	148	seq2 &= 0x0fff;
	149
	150	return (int)((seq1 - seq2) & 0x0fff) > 2048;
	151	}
	152
	153
c4ea94ab	154	static __inline__ int dn_after(__u16 seq1, __u16 seq2)
1da177e4 LT	155	{
	156	seq1 &= 0x0fff;
	157	seq2 &= 0x0fff;
	158
	159	return (int)((seq2 - seq1) & 0x0fff) > 2048;
	160	}
	161
c4ea94ab	162	static __inline__ int dn_equal(__u16 seq1, __u16 seq2)
1da177e4 LT	163	{
	164	return ((seq1 ^ seq2) & 0x0fff) == 0;
	165	}
	166
c4ea94ab	167	static __inline__ int dn_before_or_equal(__u16 seq1, __u16 seq2)
1da177e4 LT	168	{
	169	return (dn_before(seq1, seq2) \|\| dn_equal(seq1, seq2));
	170	}
	171
c4ea94ab	172	static __inline__ void seq_add(__u16 *seq, __u16 off)
1da177e4 LT	173	{
	174	(*seq) += off;
	175	(*seq) &= 0x0fff;
	176	}
	177
c4ea94ab	178	static __inline__ int seq_next(__u16 seq1, __u16 seq2)
1da177e4 LT	179	{
	180	return dn_equal(seq1 + 1, seq2);
	181	}
	182
	183	/*
	184	* Can we delay the ack ?
	185	*/
c4ea94ab	186	static __inline__ int sendack(__u16 seq)
1da177e4 LT	187	{
	188	return (int)((seq & 0x1000) ? 0 : 1);
	189	}
	190
	191	/*
	192	* Is socket congested ?
	193	*/
	194	static __inline__ int dn_congested(struct sock *sk)
	195	{
	196	return atomic_read(&sk->sk_rmem_alloc) > (sk->sk_rcvbuf >> 1);
	197	}
	198
	199	#define DN_MAX_NSP_DATA_HEADER (11)
	200
	201	#endif /* _NET_DN_NSP_H */