1 /* if_imp.h 4.3 82/02/12 */ 2 3 /* 4 * Structure of IMP 1822 long leader. 5 */ 6 struct control_leader { 7 u_char dl_format; /* leader format */ 8 u_char dl_network; /* src/dest network */ 9 u_char dl_flags; /* leader flags */ 10 u_char dl_mtype; /* message type */ 11 u_char dl_htype; /* handling type */ 12 u_char dl_host; /* host number */ 13 union { 14 u_short dl_short; 15 u_char dl_char[2]; 16 } dlun; 17 #define dl_imp dlun.dl_short /* imp field */ 18 #define dl_impno dlun.dl_char[1] /* imp number */ 19 #define dl_lh dlun.dl_char[0] /* logical host */ 20 u_char dl_link; /* link number */ 21 u_char dl_subtype; /* message subtype */ 22 }; 23 24 struct imp_leader { 25 struct control_leader il_dl; 26 #define il_format il_dl.dl_format 27 #define il_network il_dl.dl_network 28 #define il_flags il_dl.dl_flags 29 #define il_mtype il_dl.dl_mtype 30 #define il_htype il_dl.dl_htype 31 #define il_host il_dl.dl_host 32 #define il_imp il_dl.dl_imp 33 #define il_impno il_dl.dl_impno 34 #define il_lh il_dl.dl_lh 35 #define il_link il_dl.dl_link 36 #define il_subtype il_dl.dl_subtype 37 u_short il_length; /* message length */ 38 }; 39 40 #define IMP_DROPCNT 2 /* # of noops from imp to ignore */ 41 /* don't use 1019 here, 'cuz odd numbers and word counts are confusing */ 42 #define IMP_MTU (sizeof (struct imp_leader) + 1018) 43 44 /* 45 * IMP-host flags 46 */ 47 #define IMP_NFF 0xf /* 96-bit (new) format */ 48 #define IMP_TRACE 0x8 /* trace message route */ 49 50 #define IMP_DMASK 0x3 /* host going down mask */ 51 52 /* 53 * IMP-host message types. 54 */ 55 #define IMPTYPE_DATA 0 /* data for protocol */ 56 #define IMPTYPE_BADLEADER 1 /* leader error */ 57 #define IMPTYPE_DOWN 2 /* imp going down */ 58 #define IMPTYPE_NOOP 4 /* noop seen during initialization */ 59 #define IMPTYPE_RFNM 5 /* request for new messages */ 60 #define IMPTYPE_HOSTDEAD 6 /* host doesn't respond */ 61 #define IMPTYPE_HOSTUNREACH 7 /* host unreachable */ 62 #define IMPTYPE_BADDATA 8 /* data error */ 63 #define IMPTYPE_INCOMPLETE 9 /* incomplete message, send rest */ 64 #define IMPTYPE_RESET 10 /* reset complete */ 65 /* non-blocking IMP interface */ 66 #define IMPTYPE_RETRY 11 /* IMP refused, try again */ 67 #define IMPTYPE_NOTIFY 12 /* IMP refused, will notify */ 68 #define IMPTYPE_TRYING 13 /* IMP refused, still rexmt'ng */ 69 #define IMPTYPE_READY 14 /* ready for next message */ 70 71 /* 72 * IMPTYPE_DOWN subtypes. 73 */ 74 #define IMPDOWN_GOING 0 /* 30 secs */ 75 #define IMPDOWN_PM 1 /* hardware PM */ 76 #define IMPDOWN_RELOAD 2 /* software reload */ 77 #define IMPDOWN_RESTART 3 /* emergency restart */ 78 79 /* 80 * IMPTYPE_BADLEADER subtypes. 81 */ 82 #define IMPLEADER_ERR 0 /* error flip-flop set */ 83 #define IMPLEADER_SHORT 1 /* leader < 80 bits */ 84 #define IMPLEADER_TYPE 2 /* illegal type field */ 85 #define IMPLEADER_OPPOSITE 3 /* opposite leader type */ 86 87 /* 88 * IMPTYPE_HOSTDEAD subtypes. 89 */ 90 #define IMPHOST_NORDY 1 /* ready-line negated */ 91 #define IMPHOST_TARDY 2 /* tardy receiving mesgs */ 92 #define IMPHOST_NOEXIST 3 /* NCC doesn't know host */ 93 #define IMPHOST_IMPSOFT 4 /* IMP software won't allow mesgs */ 94 #define IMPHOST_PM 5 /* host down for scheduled PM */ 95 #define IMPHOST_HARDSCHED 6 /* " " " " hardware work */ 96 #define IMPHOST_SOFTSCHED 7 /* " " " " software work */ 97 #define IMPHOST_RESTART 8 /* host down for emergency restart */ 98 #define IMPHOST_POWER 9 /* down because of power outage */ 99 #define IMPHOST_BREAKPOINT 10 /* host stopped at a breakpoint */ 100 #define IMPHOST_HARDWARE 11 /* hardware failure */ 101 #define IMPHOST_NOTUP 12 /* host not scheduled to be up */ 102 /* 13-14 currently unused */ 103 #define IMPHOST_COMINGUP 15 /* host in process of coming up */ 104 105 /* 106 * IMPTYPE_HOSTUNREACH subtypes. 107 */ 108 #define IMPREACH_IMP 0 /* destination IMP can't be reached */ 109 #define IMPREACH_HOSTUP 1 /* destination host isn't up */ 110 #define IMPREACH_LEADER 2 /* host doesn't support long leader */ 111 #define IMPREACH_PROHIBITED 3 /* communication is prohibited */ 112 113 /* 114 * IMPTYPE_INCOMPLETE subtypes. 115 */ 116 #define IMPCOMPLETE_SLOW 0 /* host didn't take data fast enough */ 117 #define IMPCOMPLETE_TOOLONG 1 /* message was too long */ 118 #define IMPCOMPLETE_TIMEOUT 2 /* mesg transmission time > 15 sec. */ 119 #define IMPCOMPLETE_FAILURE 3 /* IMP/circuit failure */ 120 #define IMPCOMPLETE_NOSPACE 4 /* no resources within 15 sec. */ 121 #define IMPCOMPLETE_IMPIO 5 /* src IMP I/O failure during receipt */ 122 123 /* 124 * IMPTYPE_RETRY subtypes. 125 */ 126 #define IMPRETRY_BUFFER 0 /* IMP buffer wasn't available */ 127 #define IMPRETRY_BLOCK 1 /* connection block unavailable */ 128 129 /* 130 * Data structure shared between IMP protocol module and hardware 131 * interface driver. Used to allow layering of IMP routines on top 132 * of varying device drivers. NOTE: there's a possible problem 133 * with ambiguity in the ``unit'' definition which is implicitly 134 * shared by the both IMP and device code. If we have two IMPs, 135 * with each on top of a device of the same unit, things won't work. 136 * The assumption is if you've got multiple IMPs, then they all run 137 * on top of the same type of device, or they must have different units. 138 */ 139 struct impcb { 140 char ic_oactive; /* output in progress */ 141 int (*ic_init)(); /* hardware init routine */ 142 int (*ic_start)(); /* hardware start output routine */ 143 }; 144 145 /* 146 * State of an IMP. 147 */ 148 #define IMPS_DOWN 0 /* unavailable, don't use */ 149 #define IMPS_GOINGDOWN 1 /* been told we go down soon */ 150 #define IMPS_INIT 2 /* coming up */ 151 #define IMPS_UP 3 /* ready to go */ 152 #define IMPS_RESET 4 /* reset in progress */ 153 154 #define IMPTV_DOWN (30*60) /* going down timer 30 secs */ 155 156 #ifdef IMPLEADERS 157 char * impleaders[IMPTYPE_READY+1] = { 158 "DATA", "BADLEADER", "DOWN", "bad", "NOOP", "RFNM", "HOSTDEAD", 159 "HOSTUNREACH", "BADDATA", "INCOMPLETE", "RESET", "RETRY", 160 "NOTIFY", "TRYING", "READY" 161 }; 162 #endif 163