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Diffstat (limited to 'include/net/dn_nsp.h')
| -rw-r--r-- | include/net/dn_nsp.h | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/include/net/dn_nsp.h b/include/net/dn_nsp.h new file mode 100644 index 000000000..d8cef8c06 --- /dev/null +++ b/include/net/dn_nsp.h @@ -0,0 +1,194 @@ +#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 */ + +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); +extern void dn_send_disc(struct sock *sk, unsigned char type, unsigned short reason); +extern void dn_nsp_send_lnk(struct sock *sk, unsigned short flags); +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, 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, int pri); +extern struct sk_buff *dn_alloc_send_skb(struct sock *sk, int *size, int noblock, int *err); + +#define NSP_REASON_NR 1 +#define NSP_REASON_DC 42 +#define NSP_REASON_NL 41 + +#define NSP_DISCINIT 0x38 +#define NSP_DISCCONF 0x48 + +/*------------------------- NSP - messages ------------------------------*/ +/* Data Messages */ +/*---------------*/ + +/* Data Messages (data segment/interrupt/link service) */ + + struct nsp_data_seg_msg + { + unsigned char msgflg __attribute__((packed)); + unsigned short dstaddr __attribute__((packed)); + unsigned short srcaddr __attribute__((packed)); + }; + + struct nsp_data_opt_msg + { + unsigned short acknum __attribute__((packed)); + unsigned short segnum __attribute__((packed)); + unsigned short lsflgs __attribute__((packed)); + }; + + struct nsp_data_opt_msg1 + { + unsigned short acknum __attribute__((packed)); + unsigned short segnum __attribute__((packed)); + }; + +/* Acknowledgment Messages */ +/*-------------------------*/ + +/* Acknowledgment Messages (data/other data) */ + + struct nsp_data_ack_msg + { + unsigned char msgflg __attribute__((packed)); + unsigned short dstaddr __attribute__((packed)); + unsigned short srcaddr __attribute__((packed)); + unsigned short acknum __attribute__((packed)); + }; + +/* Connect Acknowledgment Message */ + + struct nsp_conn_ack_msg + { + unsigned char msgflg __attribute__((packed)); + unsigned short dstaddr __attribute__((packed)); + }; + +/* Control Messages */ +/*------------------*/ + +/* Connect Initiate/Retransmit Initiate/Connect Confirm */ + + struct nsp_conn_init_msg + { + unsigned char msgflg __attribute__((packed)); +#define NSP_CI 0x18 /* Connect Initiate */ +#define NSP_RCI 0x68 /* Retrans. Conn Init */ + unsigned short dstaddr __attribute__((packed)); + unsigned short srcaddr __attribute__((packed)); + unsigned char services __attribute__((packed)); +#define NSP_FC_NONE 0x00 /* Flow Control None */ +#define NSP_FC_SRC 0x04 /* Seg Req. Count */ +#define NSP_FC_SCMC 0x08 /* Sess. Control Mess */ + unsigned char info __attribute__((packed)); + unsigned short segsize __attribute__((packed)); + }; + +/* Disconnect Initiate/Disconnect Confirm */ + + struct nsp_disconn_init_msg + { + unsigned char msgflg __attribute__((packed)); + unsigned short dstaddr __attribute__((packed)); + unsigned short srcaddr __attribute__((packed)); + unsigned short reason __attribute__((packed)); + }; + + +/*------------------------- SCP - messages ------------------------------*/ + + struct srcobj_fmt + { + char format __attribute__((packed)); + unsigned char task __attribute__((packed)); + unsigned short grpcode __attribute__((packed)); + unsigned short usrcode __attribute__((packed)); + char dlen __attribute__((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 before(unsigned short seq1, unsigned short seq2) +{ + seq1 &= 0x0fff; + seq2 &= 0x0fff; + + return (int)((seq1 - seq2) & 0x0fff) > 2048; +} + + +static __inline__ int after(unsigned short seq1, unsigned short seq2) +{ + seq1 &= 0x0fff; + seq2 &= 0x0fff; + + return (int)((seq2 - seq1) & 0x0fff) > 2048; +} + +static __inline__ int equal(unsigned short seq1, unsigned short seq2) +{ + return ((seq1 ^ seq2) & 0x0fff) == 0; +} + +static __inline__ int before_or_equal(unsigned short seq1, unsigned short seq2) +{ + return (before(seq1, seq2) || equal(seq1, seq2)); +} + +static __inline__ void seq_add(unsigned short *seq, unsigned short off) +{ + *seq += off; + *seq &= 0x0fff; +} + +static __inline__ int seq_next(unsigned short seq1, unsigned short seq2) +{ + return (((seq2&0x0fff) - (seq1&0x0fff)) == 1); +} + +/* + * Can we delay the ack ? + */ +static __inline__ int sendack(unsigned short seq) +{ + return (int)((seq & 0x1000) ? 0 : 1); +} + +/* + * Is socket congested ? + */ +static __inline__ int dn_congested(struct sock *sk) +{ + return atomic_read(&sk->rmem_alloc) > (sk->rcvbuf >> 1); +} + +#endif /* _NET_DN_NSP_H */ |