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 18void dn_nsp_send_data_ack(struct sock *sk); 19void dn_nsp_send_oth_ack(struct sock *sk); 20void dn_nsp_delayed_ack(struct sock *sk); 21void dn_send_conn_ack(struct sock *sk); 22void dn_send_conn_conf(struct sock *sk, gfp_t gfp); 23void dn_nsp_send_disc(struct sock *sk, unsigned char type, 24 unsigned short reason, gfp_t gfp); 25void dn_nsp_return_disc(struct sk_buff *skb, unsigned char type, 26 unsigned short reason); 27void dn_nsp_send_link(struct sock *sk, unsigned char lsflags, char fcval); 28void dn_nsp_send_conninit(struct sock *sk, unsigned char flags); 29 30void dn_nsp_output(struct sock *sk); 31int dn_nsp_check_xmit_queue(struct sock *sk, struct sk_buff *skb, 32 struct sk_buff_head *q, unsigned short acknum); 33void dn_nsp_queue_xmit(struct sock *sk, struct sk_buff *skb, gfp_t gfp, 34 int oob); 35unsigned long dn_nsp_persist(struct sock *sk); 36int dn_nsp_xmit_timeout(struct sock *sk); 37 38int dn_nsp_rx(struct sk_buff *); 39int dn_nsp_backlog_rcv(struct sock *sk, struct sk_buff *skb); 40 41struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri); 42struct sk_buff *dn_alloc_send_skb(struct sock *sk, size_t *size, int noblock, 43 long timeo, int *err); 44 45#define NSP_REASON_OK 0 /* No error */ 46#define NSP_REASON_NR 1 /* No resources */ 47#define NSP_REASON_UN 2 /* Unrecognised node name */ 48#define NSP_REASON_SD 3 /* Node shutting down */ 49#define NSP_REASON_ID 4 /* Invalid destination end user */ 50#define NSP_REASON_ER 5 /* End user lacks resources */ 51#define NSP_REASON_OB 6 /* Object too busy */ 52#define NSP_REASON_US 7 /* Unspecified error */ 53#define NSP_REASON_TP 8 /* Third-Party abort */ 54#define NSP_REASON_EA 9 /* End user has aborted the link */ 55#define NSP_REASON_IF 10 /* Invalid node name format */ 56#define NSP_REASON_LS 11 /* Local node shutdown */ 57#define NSP_REASON_LL 32 /* Node lacks logical-link resources */ 58#define NSP_REASON_LE 33 /* End user lacks logical-link resources */ 59#define NSP_REASON_UR 34 /* Unacceptable RQSTRID or PASSWORD field */ 60#define NSP_REASON_UA 36 /* Unacceptable ACCOUNT field */ 61#define NSP_REASON_TM 38 /* End user timed out logical link */ 62#define NSP_REASON_NU 39 /* Node unreachable */ 63#define NSP_REASON_NL 41 /* No-link message */ 64#define NSP_REASON_DC 42 /* Disconnect confirm */ 65#define NSP_REASON_IO 43 /* Image data field overflow */ 66 67#define NSP_DISCINIT 0x38 68#define NSP_DISCCONF 0x48 69 70/*------------------------- NSP - messages ------------------------------*/ 71/* Data Messages */ 72/*---------------*/ 73 74/* Data Messages (data segment/interrupt/link service) */ 75 76struct nsp_data_seg_msg { 77 __u8 msgflg; 78 __le16 dstaddr; 79 __le16 srcaddr; 80} __packed; 81 82struct nsp_data_opt_msg { 83 __le16 acknum; 84 __le16 segnum; 85 __le16 lsflgs; 86} __packed; 87 88struct nsp_data_opt_msg1 { 89 __le16 acknum; 90 __le16 segnum; 91} __packed; 92 93 94/* Acknowledgment Message (data/other data) */ 95struct nsp_data_ack_msg { 96 __u8 msgflg; 97 __le16 dstaddr; 98 __le16 srcaddr; 99 __le16 acknum; 100} __packed; 101 102/* Connect Acknowledgment Message */ 103struct nsp_conn_ack_msg { 104 __u8 msgflg; 105 __le16 dstaddr; 106} __packed; 107 108 109/* Connect Initiate/Retransmit Initiate/Connect Confirm */ 110struct nsp_conn_init_msg { 111 __u8 msgflg; 112#define NSP_CI 0x18 /* Connect Initiate */ 113#define NSP_RCI 0x68 /* Retrans. Conn Init */ 114 __le16 dstaddr; 115 __le16 srcaddr; 116 __u8 services; 117#define NSP_FC_NONE 0x00 /* Flow Control None */ 118#define NSP_FC_SRC 0x04 /* Seg Req. Count */ 119#define NSP_FC_SCMC 0x08 /* Sess. Control Mess */ 120#define NSP_FC_MASK 0x0c /* FC type mask */ 121 __u8 info; 122 __le16 segsize; 123} __packed; 124 125/* Disconnect Initiate/Disconnect Confirm */ 126struct nsp_disconn_init_msg { 127 __u8 msgflg; 128 __le16 dstaddr; 129 __le16 srcaddr; 130 __le16 reason; 131} __packed; 132 133 134 135struct srcobj_fmt { 136 __u8 format; 137 __u8 task; 138 __le16 grpcode; 139 __le16 usrcode; 140 __u8 dlen; 141} __packed; 142 143/* 144 * A collection of functions for manipulating the sequence 145 * numbers used in NSP. Similar in operation to the functions 146 * of the same name in TCP. 147 */ 148static __inline__ int dn_before(__u16 seq1, __u16 seq2) 149{ 150 seq1 &= 0x0fff; 151 seq2 &= 0x0fff; 152 153 return (int)((seq1 - seq2) & 0x0fff) > 2048; 154} 155 156 157static __inline__ int dn_after(__u16 seq1, __u16 seq2) 158{ 159 seq1 &= 0x0fff; 160 seq2 &= 0x0fff; 161 162 return (int)((seq2 - seq1) & 0x0fff) > 2048; 163} 164 165static __inline__ int dn_equal(__u16 seq1, __u16 seq2) 166{ 167 return ((seq1 ^ seq2) & 0x0fff) == 0; 168} 169 170static __inline__ int dn_before_or_equal(__u16 seq1, __u16 seq2) 171{ 172 return (dn_before(seq1, seq2) || dn_equal(seq1, seq2)); 173} 174 175static __inline__ void seq_add(__u16 *seq, __u16 off) 176{ 177 (*seq) += off; 178 (*seq) &= 0x0fff; 179} 180 181static __inline__ int seq_next(__u16 seq1, __u16 seq2) 182{ 183 return dn_equal(seq1 + 1, seq2); 184} 185 186/* 187 * Can we delay the ack ? 188 */ 189static __inline__ int sendack(__u16 seq) 190{ 191 return (int)((seq & 0x1000) ? 0 : 1); 192} 193 194/* 195 * Is socket congested ? 196 */ 197static __inline__ int dn_congested(struct sock *sk) 198{ 199 return atomic_read(&sk->sk_rmem_alloc) > (sk->sk_rcvbuf >> 1); 200} 201 202#define DN_MAX_NSP_DATA_HEADER (11) 203 204#endif /* _NET_DN_NSP_H */ 205