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

#ifndef _NET_DN_NSP_H
#define _NET_DN_NSP_H
/******************************************************************************
    (c) 1995-1998 E.M. Serrat		emserrat@geocities.com
    
    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 */

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

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

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

struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri);
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
	1	#ifndef _NET_DN_NSP_H
	2	#define _NET_DN_NSP_H
	3	/******************************************************************************
	4	(c) 1995-1998 E.M. Serrat emserrat@geocities.com
	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	void dn_nsp_send_data_ack(struct sock *sk);
	19	void dn_nsp_send_oth_ack(struct sock *sk);
	20	void dn_nsp_delayed_ack(struct sock *sk);
	21	void dn_send_conn_ack(struct sock *sk);
	22	void dn_send_conn_conf(struct sock *sk, gfp_t gfp);
	23	void dn_nsp_send_disc(struct sock *sk, unsigned char type,
	24	unsigned short reason, gfp_t gfp);
	25	void dn_nsp_return_disc(struct sk_buff *skb, unsigned char type,
	26	unsigned short reason);
	27	void dn_nsp_send_link(struct sock *sk, unsigned char lsflags, char fcval);
	28	void dn_nsp_send_conninit(struct sock *sk, unsigned char flags);
	29
	30	void dn_nsp_output(struct sock *sk);
	31	int dn_nsp_check_xmit_queue(struct sock sk, struct sk_buff skb,
	32	struct sk_buff_head *q, unsigned short acknum);
	33	void dn_nsp_queue_xmit(struct sock sk, struct sk_buff skb, gfp_t gfp,
	34	int oob);
	35	unsigned long dn_nsp_persist(struct sock *sk);
	36	int dn_nsp_xmit_timeout(struct sock *sk);
	37
	38	int dn_nsp_rx(struct sk_buff *);
	39	int dn_nsp_backlog_rcv(struct sock sk, struct sk_buff skb);
	40
	41	struct sk_buff dn_alloc_skb(struct sock sk, int size, gfp_t pri);
	42	struct sk_buff dn_alloc_send_skb(struct sock sk, size_t *size, int noblock,
	43	long timeo, int *err);
	44
	45	#define NSP_REASON_OK 0 /* No error */
	46	#define NSP_REASON_NR 1 /* No resources */
	47	#define NSP_REASON_UN 2 /* Unrecognised node name */
	48	#define NSP_REASON_SD 3 /* Node shutting down */
	49	#define NSP_REASON_ID 4 /* Invalid destination end user */
	50	#define NSP_REASON_ER 5 /* End user lacks resources */
	51	#define NSP_REASON_OB 6 /* Object too busy */
	52	#define NSP_REASON_US 7 /* Unspecified error */
	53	#define NSP_REASON_TP 8 /* Third-Party abort */
	54	#define NSP_REASON_EA 9 /* End user has aborted the link */
	55	#define NSP_REASON_IF 10 /* Invalid node name format */
	56	#define NSP_REASON_LS 11 /* Local node shutdown */
	57	#define NSP_REASON_LL 32 /* Node lacks logical-link resources */
	58	#define NSP_REASON_LE 33 /* End user lacks logical-link resources */
	59	#define NSP_REASON_UR 34 /* Unacceptable RQSTRID or PASSWORD field */
	60	#define NSP_REASON_UA 36 /* Unacceptable ACCOUNT field */
	61	#define NSP_REASON_TM 38 /* End user timed out logical link */
	62	#define NSP_REASON_NU 39 /* Node unreachable */
	63	#define NSP_REASON_NL 41 /* No-link message */
	64	#define NSP_REASON_DC 42 /* Disconnect confirm */
	65	#define NSP_REASON_IO 43 /* Image data field overflow */
	66
	67	#define NSP_DISCINIT 0x38
	68	#define NSP_DISCCONF 0x48
	69
	70	/------------------------- NSP - messages ------------------------------/
	71	/* Data Messages */
	72	/---------------/
	73
	74	/* Data Messages (data segment/interrupt/link service) */
	75
	76	struct nsp_data_seg_msg {
	77	__u8 msgflg;
	78	__le16 dstaddr;
	79	__le16 srcaddr;
	80	} __packed;
	81
	82	struct nsp_data_opt_msg {
	83	__le16 acknum;
	84	__le16 segnum;
	85	__le16 lsflgs;
	86	} __packed;
	87
	88	struct nsp_data_opt_msg1 {
	89	__le16 acknum;
	90	__le16 segnum;
	91	} __packed;
	92
	93
	94	/* Acknowledgment Message (data/other data) */
	95	struct nsp_data_ack_msg {
	96	__u8 msgflg;
	97	__le16 dstaddr;
	98	__le16 srcaddr;
	99	__le16 acknum;
	100	} __packed;
	101
	102	/* Connect Acknowledgment Message */
	103	struct nsp_conn_ack_msg {
	104	__u8 msgflg;
	105	__le16 dstaddr;
	106	} __packed;
	107
	108
	109	/* Connect Initiate/Retransmit Initiate/Connect Confirm */
	110	struct nsp_conn_init_msg {
	111	__u8 msgflg;
	112	#define NSP_CI 0x18 /* Connect Initiate */
	113	#define NSP_RCI 0x68 /* Retrans. Conn Init */
	114	__le16 dstaddr;
	115	__le16 srcaddr;
	116	__u8 services;
	117	#define NSP_FC_NONE 0x00 /* Flow Control None */
	118	#define NSP_FC_SRC 0x04 /* Seg Req. Count */
	119	#define NSP_FC_SCMC 0x08 /* Sess. Control Mess */
	120	#define NSP_FC_MASK 0x0c /* FC type mask */
	121	__u8 info;
	122	__le16 segsize;
	123	} __packed;
	124
	125	/* Disconnect Initiate/Disconnect Confirm */
	126	struct nsp_disconn_init_msg {
	127	__u8 msgflg;
	128	__le16 dstaddr;
	129	__le16 srcaddr;
	130	__le16 reason;
	131	} __packed;
	132
	133
	134
	135	struct srcobj_fmt {
	136	__u8 format;
	137	__u8 task;
	138	__le16 grpcode;
	139	__le16 usrcode;
	140	__u8 dlen;
	141	} __packed;
	142
	143	/*
	144	* A collection of functions for manipulating the sequence
	145	* numbers used in NSP. Similar in operation to the functions
	146	* of the same name in TCP.
	147	*/
	148	static __inline__ int dn_before(__u16 seq1, __u16 seq2)
	149	{
	150	seq1 &= 0x0fff;
	151	seq2 &= 0x0fff;
	152
	153	return (int)((seq1 - seq2) & 0x0fff) > 2048;
	154	}
	155
	156
	157	static __inline__ int dn_after(__u16 seq1, __u16 seq2)
	158	{
	159	seq1 &= 0x0fff;
	160	seq2 &= 0x0fff;
	161
	162	return (int)((seq2 - seq1) & 0x0fff) > 2048;
	163	}
	164
	165	static __inline__ int dn_equal(__u16 seq1, __u16 seq2)
	166	{
	167	return ((seq1 ^ seq2) & 0x0fff) == 0;
	168	}
	169
	170	static __inline__ int dn_before_or_equal(__u16 seq1, __u16 seq2)
	171	{
	172	return (dn_before(seq1, seq2) \|\| dn_equal(seq1, seq2));
	173	}
	174
	175	static __inline__ void seq_add(__u16 *seq, __u16 off)
	176	{
	177	(*seq) += off;
	178	(*seq) &= 0x0fff;
	179	}
	180
	181	static __inline__ int seq_next(__u16 seq1, __u16 seq2)
	182	{
	183	return dn_equal(seq1 + 1, seq2);
	184	}
	185
	186	/*
	187	* Can we delay the ack ?
	188	*/
	189	static __inline__ int sendack(__u16 seq)
	190	{
	191	return (int)((seq & 0x1000) ? 0 : 1);
	192	}
	193
	194	/*
	195	* Is socket congested ?
	196	*/
	197	static __inline__ int dn_congested(struct sock *sk)
	198	{
	199	return atomic_read(&sk->sk_rmem_alloc) > (sk->sk_rcvbuf >> 1);
	200	}
	201
	202	#define DN_MAX_NSP_DATA_HEADER (11)
	203
	204	#endif /* _NET_DN_NSP_H */