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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 | #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, int gfp); extern void dn_nsp_send_disc(struct sock *sk, unsigned char type, unsigned short reason, int 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, int 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, int pri); extern struct sk_buff *dn_alloc_send_skb(struct sock *sk, int *size, int noblock, 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 { 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 Message (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)); }; /* 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 */ #define NSP_FC_MASK 0x0c /* FC type mask */ 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)); }; 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 equal(seq1 + 1, seq2); } /* * 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 */ |