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 18extern void dn_nsp_send_data_ack(struct sock *sk); 19extern void dn_nsp_send_oth_ack(struct sock *sk); 20extern void dn_nsp_delayed_ack(struct sock *sk); 21extern void dn_send_conn_ack(struct sock *sk); 22extern void dn_send_conn_conf(struct sock *sk, gfp_t gfp); 23extern void dn_nsp_send_disc(struct sock *sk, unsigned char type, 24 unsigned short reason, gfp_t gfp); 25extern void dn_nsp_return_disc(struct sk_buff *skb, unsigned char type, 26 unsigned short reason); 27extern void dn_nsp_send_link(struct sock *sk, unsigned char lsflags, char fcval); 28extern void dn_nsp_send_conninit(struct sock *sk, unsigned char flags); 29 30extern void dn_nsp_output(struct sock *sk); 31extern int dn_nsp_check_xmit_queue(struct sock *sk, struct sk_buff *skb, struct sk_buff_head *q, unsigned short acknum); 32extern void dn_nsp_queue_xmit(struct sock *sk, struct sk_buff *skb, gfp_t gfp, int oob); 33extern unsigned long dn_nsp_persist(struct sock *sk); 34extern int dn_nsp_xmit_timeout(struct sock *sk); 35 36extern int dn_nsp_rx(struct sk_buff *); 37extern int dn_nsp_backlog_rcv(struct sock *sk, struct sk_buff *skb); 38 39extern struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri); 40extern 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 73struct nsp_data_seg_msg 74{ 75 __u8 msgflg; 76 __le16 dstaddr; 77 __le16 srcaddr; 78} __attribute__((packed)); 79 80struct nsp_data_opt_msg 81{ 82 __le16 acknum; 83 __le16 segnum; 84 __le16 lsflgs; 85} __attribute__((packed)); 86 87struct nsp_data_opt_msg1 88{ 89 __le16 acknum; 90 __le16 segnum; 91} __attribute__((packed)); 92 93 94/* Acknowledgment Message (data/other data) */ 95struct nsp_data_ack_msg 96{ 97 __u8 msgflg; 98 __le16 dstaddr; 99 __le16 srcaddr; 100 __le16 acknum; 101} __attribute__((packed)); 102 103/* Connect Acknowledgment Message */ 104struct nsp_conn_ack_msg 105{ 106 __u8 msgflg; 107 __le16 dstaddr; 108} __attribute__((packed)); 109 110 111/* Connect Initiate/Retransmit Initiate/Connect Confirm */ 112struct nsp_conn_init_msg 113{ 114 __u8 msgflg; 115#define NSP_CI 0x18 /* Connect Initiate */ 116#define NSP_RCI 0x68 /* Retrans. Conn Init */ 117 __le16 dstaddr; 118 __le16 srcaddr; 119 __u8 services; 120#define NSP_FC_NONE 0x00 /* Flow Control None */ 121#define NSP_FC_SRC 0x04 /* Seg Req. Count */ 122#define NSP_FC_SCMC 0x08 /* Sess. Control Mess */ 123#define NSP_FC_MASK 0x0c /* FC type mask */ 124 __u8 info; 125 __le16 segsize; 126} __attribute__((packed)); 127 128/* Disconnect Initiate/Disconnect Confirm */ 129struct nsp_disconn_init_msg 130{ 131 __u8 msgflg; 132 __le16 dstaddr; 133 __le16 srcaddr; 134 __le16 reason; 135} __attribute__((packed)); 136 137 138 139struct srcobj_fmt 140{ 141 __u8 format; 142 __u8 task; 143 __le16 grpcode; 144 __le16 usrcode; 145 __u8 dlen; 146} __attribute__((packed)); 147 148/* 149 * A collection of functions for manipulating the sequence 150 * numbers used in NSP. Similar in operation to the functions 151 * of the same name in TCP. 152 */ 153static __inline__ int dn_before(__u16 seq1, __u16 seq2) 154{ 155 seq1 &= 0x0fff; 156 seq2 &= 0x0fff; 157 158 return (int)((seq1 - seq2) & 0x0fff) > 2048; 159} 160 161 162static __inline__ int dn_after(__u16 seq1, __u16 seq2) 163{ 164 seq1 &= 0x0fff; 165 seq2 &= 0x0fff; 166 167 return (int)((seq2 - seq1) & 0x0fff) > 2048; 168} 169 170static __inline__ int dn_equal(__u16 seq1, __u16 seq2) 171{ 172 return ((seq1 ^ seq2) & 0x0fff) == 0; 173} 174 175static __inline__ int dn_before_or_equal(__u16 seq1, __u16 seq2) 176{ 177 return (dn_before(seq1, seq2) || dn_equal(seq1, seq2)); 178} 179 180static __inline__ void seq_add(__u16 *seq, __u16 off) 181{ 182 (*seq) += off; 183 (*seq) &= 0x0fff; 184} 185 186static __inline__ int seq_next(__u16 seq1, __u16 seq2) 187{ 188 return dn_equal(seq1 + 1, seq2); 189} 190 191/* 192 * Can we delay the ack ? 193 */ 194static __inline__ int sendack(__u16 seq) 195{ 196 return (int)((seq & 0x1000) ? 0 : 1); 197} 198 199/* 200 * Is socket congested ? 201 */ 202static __inline__ int dn_congested(struct sock *sk) 203{ 204 return atomic_read(&sk->sk_rmem_alloc) > (sk->sk_rcvbuf >> 1); 205} 206 207#define DN_MAX_NSP_DATA_HEADER (11) 208 209#endif /* _NET_DN_NSP_H */ 210