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 __u8 msgflg; 75 __le16 dstaddr; 76 __le16 srcaddr; 77} __packed; 78 79struct nsp_data_opt_msg { 80 __le16 acknum; 81 __le16 segnum; 82 __le16 lsflgs; 83} __packed; 84 85struct nsp_data_opt_msg1 { 86 __le16 acknum; 87 __le16 segnum; 88} __packed; 89 90 91/* Acknowledgment Message (data/other data) */ 92struct nsp_data_ack_msg { 93 __u8 msgflg; 94 __le16 dstaddr; 95 __le16 srcaddr; 96 __le16 acknum; 97} __packed; 98 99/* Connect Acknowledgment Message */ 100struct nsp_conn_ack_msg { 101 __u8 msgflg; 102 __le16 dstaddr; 103} __packed; 104 105 106/* Connect Initiate/Retransmit Initiate/Connect Confirm */ 107struct nsp_conn_init_msg { 108 __u8 msgflg; 109#define NSP_CI 0x18 /* Connect Initiate */ 110#define NSP_RCI 0x68 /* Retrans. Conn Init */ 111 __le16 dstaddr; 112 __le16 srcaddr; 113 __u8 services; 114#define NSP_FC_NONE 0x00 /* Flow Control None */ 115#define NSP_FC_SRC 0x04 /* Seg Req. Count */ 116#define NSP_FC_SCMC 0x08 /* Sess. Control Mess */ 117#define NSP_FC_MASK 0x0c /* FC type mask */ 118 __u8 info; 119 __le16 segsize; 120} __packed; 121 122/* Disconnect Initiate/Disconnect Confirm */ 123struct nsp_disconn_init_msg { 124 __u8 msgflg; 125 __le16 dstaddr; 126 __le16 srcaddr; 127 __le16 reason; 128} __packed; 129 130 131 132struct srcobj_fmt { 133 __u8 format; 134 __u8 task; 135 __le16 grpcode; 136 __le16 usrcode; 137 __u8 dlen; 138} __packed; 139 140/* 141 * A collection of functions for manipulating the sequence 142 * numbers used in NSP. Similar in operation to the functions 143 * of the same name in TCP. 144 */ 145static __inline__ int dn_before(__u16 seq1, __u16 seq2) 146{ 147 seq1 &= 0x0fff; 148 seq2 &= 0x0fff; 149 150 return (int)((seq1 - seq2) & 0x0fff) > 2048; 151} 152 153 154static __inline__ int dn_after(__u16 seq1, __u16 seq2) 155{ 156 seq1 &= 0x0fff; 157 seq2 &= 0x0fff; 158 159 return (int)((seq2 - seq1) & 0x0fff) > 2048; 160} 161 162static __inline__ int dn_equal(__u16 seq1, __u16 seq2) 163{ 164 return ((seq1 ^ seq2) & 0x0fff) == 0; 165} 166 167static __inline__ int dn_before_or_equal(__u16 seq1, __u16 seq2) 168{ 169 return (dn_before(seq1, seq2) || dn_equal(seq1, seq2)); 170} 171 172static __inline__ void seq_add(__u16 *seq, __u16 off) 173{ 174 (*seq) += off; 175 (*seq) &= 0x0fff; 176} 177 178static __inline__ int seq_next(__u16 seq1, __u16 seq2) 179{ 180 return dn_equal(seq1 + 1, seq2); 181} 182 183/* 184 * Can we delay the ack ? 185 */ 186static __inline__ int sendack(__u16 seq) 187{ 188 return (int)((seq & 0x1000) ? 0 : 1); 189} 190 191/* 192 * Is socket congested ? 193 */ 194static __inline__ int dn_congested(struct sock *sk) 195{ 196 return atomic_read(&sk->sk_rmem_alloc) > (sk->sk_rcvbuf >> 1); 197} 198 199#define DN_MAX_NSP_DATA_HEADER (11) 200 201#endif /* _NET_DN_NSP_H */ 202