[mirror_ubuntu-jammy-kernel.git] / include / net / dn_nsp.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _NET_DN_NSP_H
#define _NET_DN_NSP_H
/******************************************************************************
    (c) 1995-1998 E.M. Serrat		emserrat@geocities.com
    
*******************************************************************************/
/* 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_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
fd9871f7	1	/* SPDX-License-Identifier: GPL-2.0-or-later */
1da177e4 LT	2	#ifndef _NET_DN_NSP_H
	3	#define _NET_DN_NSP_H
	4	/******************************************************************************
	5	(c) 1995-1998 E.M. Serrat emserrat@geocities.com
	6
1da177e4 LT	7	*******************************************************************************/
	8	/* dn_nsp.c functions prototyping */
	9
59ddd965 JP	10	void dn_nsp_send_data_ack(struct sock *sk);
59ddd965 JP	11	void dn_nsp_send_oth_ack(struct sock *sk);
59ddd965 JP	12	void dn_send_conn_ack(struct sock *sk);
	13	void dn_send_conn_conf(struct sock *sk, gfp_t gfp);
	14	void dn_nsp_send_disc(struct sock *sk, unsigned char type,
	15	unsigned short reason, gfp_t gfp);
	16	void dn_nsp_return_disc(struct sk_buff *skb, unsigned char type,
	17	unsigned short reason);
	18	void dn_nsp_send_link(struct sock *sk, unsigned char lsflags, char fcval);
	19	void dn_nsp_send_conninit(struct sock *sk, unsigned char flags);
1da177e4	20
59ddd965 JP	21	void dn_nsp_output(struct sock *sk);
	22	int dn_nsp_check_xmit_queue(struct sock sk, struct sk_buff skb,
	23	struct sk_buff_head *q, unsigned short acknum);
	24	void dn_nsp_queue_xmit(struct sock sk, struct sk_buff skb, gfp_t gfp,
	25	int oob);
	26	unsigned long dn_nsp_persist(struct sock *sk);
	27	int dn_nsp_xmit_timeout(struct sock *sk);
1da177e4	28
59ddd965 JP	29	int dn_nsp_rx(struct sk_buff *);
59ddd965 JP	30	int dn_nsp_backlog_rcv(struct sock sk, struct sk_buff skb);
1da177e4	31
59ddd965 JP	32	struct sk_buff dn_alloc_skb(struct sock sk, int size, gfp_t pri);
	33	struct sk_buff dn_alloc_send_skb(struct sock sk, size_t *size, int noblock,
	34	long timeo, int *err);
1da177e4 LT	35
	36	#define NSP_REASON_OK 0 /* No error */
	37	#define NSP_REASON_NR 1 /* No resources */
	38	#define NSP_REASON_UN 2 /* Unrecognised node name */
	39	#define NSP_REASON_SD 3 /* Node shutting down */
	40	#define NSP_REASON_ID 4 /* Invalid destination end user */
	41	#define NSP_REASON_ER 5 /* End user lacks resources */
	42	#define NSP_REASON_OB 6 /* Object too busy */
	43	#define NSP_REASON_US 7 /* Unspecified error */
	44	#define NSP_REASON_TP 8 /* Third-Party abort */
	45	#define NSP_REASON_EA 9 /* End user has aborted the link */
	46	#define NSP_REASON_IF 10 /* Invalid node name format */
	47	#define NSP_REASON_LS 11 /* Local node shutdown */
	48	#define NSP_REASON_LL 32 /* Node lacks logical-link resources */
	49	#define NSP_REASON_LE 33 /* End user lacks logical-link resources */
	50	#define NSP_REASON_UR 34 /* Unacceptable RQSTRID or PASSWORD field */
	51	#define NSP_REASON_UA 36 /* Unacceptable ACCOUNT field */
	52	#define NSP_REASON_TM 38 /* End user timed out logical link */
	53	#define NSP_REASON_NU 39 /* Node unreachable */
	54	#define NSP_REASON_NL 41 /* No-link message */
	55	#define NSP_REASON_DC 42 /* Disconnect confirm */
	56	#define NSP_REASON_IO 43 /* Image data field overflow */
	57
	58	#define NSP_DISCINIT 0x38
	59	#define NSP_DISCCONF 0x48
	60
	61	/------------------------- NSP - messages ------------------------------/
	62	/* Data Messages */
	63	/---------------/
	64
	65	/* Data Messages (data segment/interrupt/link service) */
	66
fd2c3ef7	67	struct nsp_data_seg_msg {
c4ea94ab SW	68	__u8 msgflg;
	69	__le16 dstaddr;
	70	__le16 srcaddr;
bc10502d	71	} __packed;
1da177e4	72
fd2c3ef7	73	struct nsp_data_opt_msg {
c4ea94ab SW	74	__le16 acknum;
	75	__le16 segnum;
	76	__le16 lsflgs;
bc10502d	77	} __packed;
1da177e4	78
fd2c3ef7	79	struct nsp_data_opt_msg1 {
c4ea94ab SW	80	__le16 acknum;
c4ea94ab SW	81	__le16 segnum;
bc10502d	82	} __packed;
1da177e4 LT	83
	84
	85	/* Acknowledgment Message (data/other data) */
fd2c3ef7	86	struct nsp_data_ack_msg {
c4ea94ab SW	87	__u8 msgflg;
	88	__le16 dstaddr;
	89	__le16 srcaddr;
	90	__le16 acknum;
bc10502d	91	} __packed;
1da177e4 LT	92
1da177e4 LT	93	/* Connect Acknowledgment Message */
fd2c3ef7	94	struct nsp_conn_ack_msg {
c4ea94ab SW	95	__u8 msgflg;
c4ea94ab SW	96	__le16 dstaddr;
bc10502d	97	} __packed;
1da177e4 LT	98
	99
	100	/* Connect Initiate/Retransmit Initiate/Connect Confirm */
fd2c3ef7	101	struct nsp_conn_init_msg {
c4ea94ab	102	__u8 msgflg;
1da177e4 LT	103	#define NSP_CI 0x18 /* Connect Initiate */
1da177e4 LT	104	#define NSP_RCI 0x68 /* Retrans. Conn Init */
c4ea94ab SW	105	__le16 dstaddr;
	106	__le16 srcaddr;
	107	__u8 services;
1da177e4 LT	108	#define NSP_FC_NONE 0x00 /* Flow Control None */
	109	#define NSP_FC_SRC 0x04 /* Seg Req. Count */
	110	#define NSP_FC_SCMC 0x08 /* Sess. Control Mess */
	111	#define NSP_FC_MASK 0x0c /* FC type mask */
c4ea94ab SW	112	__u8 info;
c4ea94ab SW	113	__le16 segsize;
bc10502d	114	} __packed;
1da177e4 LT	115
1da177e4 LT	116	/* Disconnect Initiate/Disconnect Confirm */
fd2c3ef7	117	struct nsp_disconn_init_msg {
c4ea94ab SW	118	__u8 msgflg;
	119	__le16 dstaddr;
	120	__le16 srcaddr;
	121	__le16 reason;
bc10502d	122	} __packed;
1da177e4 LT	123
	124
	125
fd2c3ef7	126	struct srcobj_fmt {
c4ea94ab SW	127	__u8 format;
	128	__u8 task;
	129	__le16 grpcode;
	130	__le16 usrcode;
	131	__u8 dlen;
bc10502d	132	} __packed;
1da177e4 LT	133
	134	/*
	135	* A collection of functions for manipulating the sequence
	136	* numbers used in NSP. Similar in operation to the functions
	137	* of the same name in TCP.
	138	*/
c4ea94ab	139	static __inline__ int dn_before(__u16 seq1, __u16 seq2)
1da177e4 LT	140	{
	141	seq1 &= 0x0fff;
	142	seq2 &= 0x0fff;
	143
	144	return (int)((seq1 - seq2) & 0x0fff) > 2048;
	145	}
	146
	147
c4ea94ab	148	static __inline__ int dn_after(__u16 seq1, __u16 seq2)
1da177e4 LT	149	{
	150	seq1 &= 0x0fff;
	151	seq2 &= 0x0fff;
	152
	153	return (int)((seq2 - seq1) & 0x0fff) > 2048;
	154	}
	155
c4ea94ab	156	static __inline__ int dn_equal(__u16 seq1, __u16 seq2)
1da177e4 LT	157	{
	158	return ((seq1 ^ seq2) & 0x0fff) == 0;
	159	}
	160
c4ea94ab	161	static __inline__ int dn_before_or_equal(__u16 seq1, __u16 seq2)
1da177e4 LT	162	{
	163	return (dn_before(seq1, seq2) \|\| dn_equal(seq1, seq2));
	164	}
	165
c4ea94ab	166	static __inline__ void seq_add(__u16 *seq, __u16 off)
1da177e4 LT	167	{
	168	(*seq) += off;
	169	(*seq) &= 0x0fff;
	170	}
	171
c4ea94ab	172	static __inline__ int seq_next(__u16 seq1, __u16 seq2)
1da177e4 LT	173	{
	174	return dn_equal(seq1 + 1, seq2);
	175	}
	176
	177	/*
	178	* Can we delay the ack ?
	179	*/
c4ea94ab	180	static __inline__ int sendack(__u16 seq)
1da177e4 LT	181	{
	182	return (int)((seq & 0x1000) ? 0 : 1);
	183	}
	184
	185	/*
	186	* Is socket congested ?
	187	*/
	188	static __inline__ int dn_congested(struct sock *sk)
	189	{
	190	return atomic_read(&sk->sk_rmem_alloc) > (sk->sk_rcvbuf >> 1);
	191	}
	192
	193	#define DN_MAX_NSP_DATA_HEADER (11)
	194
	195	#endif /* _NET_DN_NSP_H */