Edit File: 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 */ 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 */