1 /* if_imp.h 4.6 82/03/19 */ 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 u_short dl_imp; /* imp field */ 14 u_char dl_link; /* link number */ 15 u_char dl_subtype; /* message subtype */ 16 }; 17 18 struct imp_leader { 19 struct control_leader il_dl; 20 #define il_format il_dl.dl_format 21 #define il_network il_dl.dl_network 22 #define il_flags il_dl.dl_flags 23 #define il_mtype il_dl.dl_mtype 24 #define il_htype il_dl.dl_htype 25 #define il_host il_dl.dl_host 26 #define il_imp il_dl.dl_imp 27 #define il_link il_dl.dl_link 28 #define il_subtype il_dl.dl_subtype 29 u_short il_length; /* message length */ 30 }; 31 32 #define IMP_DROPCNT 2 /* # of noops from imp to ignore */ 33 /* insure things are even... */ 34 #define IMPMTU ((8159 / NBBY) & ~01) 35 36 /* 37 * IMP-host flags 38 */ 39 #define IMP_NFF 0xf /* 96-bit (new) format */ 40 #define IMP_TRACE 0x8 /* trace message route */ 41 42 #define IMP_DMASK 0x3 /* host going down mask */ 43 44 /* 45 * IMP-host message types. 46 */ 47 #define IMPTYPE_DATA 0 /* data for protocol */ 48 #define IMPTYPE_BADLEADER 1 /* leader error */ 49 #define IMPTYPE_DOWN 2 /* imp going down */ 50 #define IMPTYPE_NOOP 4 /* noop seen during initialization */ 51 #define IMPTYPE_RFNM 5 /* request for new messages */ 52 #define IMPTYPE_HOSTDEAD 6 /* host doesn't respond */ 53 #define IMPTYPE_HOSTUNREACH 7 /* host unreachable */ 54 #define IMPTYPE_BADDATA 8 /* data error */ 55 #define IMPTYPE_INCOMPLETE 9 /* incomplete message, send rest */ 56 #define IMPTYPE_RESET 10 /* reset complete */ 57 /* non-blocking IMP interface */ 58 #define IMPTYPE_RETRY 11 /* IMP refused, try again */ 59 #define IMPTYPE_NOTIFY 12 /* IMP refused, will notify */ 60 #define IMPTYPE_TRYING 13 /* IMP refused, still rexmt'ng */ 61 #define IMPTYPE_READY 14 /* ready for next message */ 62 63 /* 64 * IMPTYPE_DOWN subtypes. 65 */ 66 #define IMPDOWN_GOING 0 /* 30 secs */ 67 #define IMPDOWN_PM 1 /* hardware PM */ 68 #define IMPDOWN_RELOAD 2 /* software reload */ 69 #define IMPDOWN_RESTART 3 /* emergency restart */ 70 71 /* 72 * IMPTYPE_BADLEADER subtypes. 73 */ 74 #define IMPLEADER_ERR 0 /* error flip-flop set */ 75 #define IMPLEADER_SHORT 1 /* leader < 80 bits */ 76 #define IMPLEADER_TYPE 2 /* illegal type field */ 77 #define IMPLEADER_OPPOSITE 3 /* opposite leader type */ 78 79 /* 80 * IMPTYPE_HOSTDEAD subtypes. 81 */ 82 #define IMPHOST_NORDY 1 /* ready-line negated */ 83 #define IMPHOST_TARDY 2 /* tardy receiving mesgs */ 84 #define IMPHOST_NOEXIST 3 /* NCC doesn't know host */ 85 #define IMPHOST_IMPSOFT 4 /* IMP software won't allow mesgs */ 86 #define IMPHOST_PM 5 /* host down for scheduled PM */ 87 #define IMPHOST_HARDSCHED 6 /* " " " " hardware work */ 88 #define IMPHOST_SOFTSCHED 7 /* " " " " software work */ 89 #define IMPHOST_RESTART 8 /* host down for emergency restart */ 90 #define IMPHOST_POWER 9 /* down because of power outage */ 91 #define IMPHOST_BREAKPOINT 10 /* host stopped at a breakpoint */ 92 #define IMPHOST_HARDWARE 11 /* hardware failure */ 93 #define IMPHOST_NOTUP 12 /* host not scheduled to be up */ 94 /* 13-14 currently unused */ 95 #define IMPHOST_COMINGUP 15 /* host in process of coming up */ 96 97 /* 98 * IMPTYPE_HOSTUNREACH subtypes. 99 */ 100 #define IMPREACH_IMP 0 /* destination IMP can't be reached */ 101 #define IMPREACH_HOSTUP 1 /* destination host isn't up */ 102 #define IMPREACH_LEADER 2 /* host doesn't support long leader */ 103 #define IMPREACH_PROHIBITED 3 /* communication is prohibited */ 104 105 /* 106 * IMPTYPE_INCOMPLETE subtypes. 107 */ 108 #define IMPCOMPLETE_SLOW 0 /* host didn't take data fast enough */ 109 #define IMPCOMPLETE_TOOLONG 1 /* message was too long */ 110 #define IMPCOMPLETE_TIMEOUT 2 /* mesg transmission time > 15 sec. */ 111 #define IMPCOMPLETE_FAILURE 3 /* IMP/circuit failure */ 112 #define IMPCOMPLETE_NOSPACE 4 /* no resources within 15 sec. */ 113 #define IMPCOMPLETE_IMPIO 5 /* src IMP I/O failure during receipt */ 114 115 /* 116 * IMPTYPE_RETRY subtypes. 117 */ 118 #define IMPRETRY_BUFFER 0 /* IMP buffer wasn't available */ 119 #define IMPRETRY_BLOCK 1 /* connection block unavailable */ 120 121 /* 122 * Data structure shared between IMP protocol module and hardware 123 * interface driver. Used to allow layering of IMP routines on top 124 * of varying device drivers. NOTE: there's a possible problem 125 * with ambiguity in the ``unit'' definition which is implicitly 126 * shared by the both IMP and device code. If we have two IMPs, 127 * with each on top of a device of the same unit, things won't work. 128 * The assumption is if you've got multiple IMPs, then they all run 129 * on top of the same type of device, or they must have different units. 130 */ 131 struct impcb { 132 char ic_oactive; /* output in progress */ 133 int (*ic_init)(); /* hardware init routine */ 134 int (*ic_start)(); /* hardware start output routine */ 135 }; 136 137 /* 138 * State of an IMP. 139 */ 140 #define IMPS_DOWN 0 /* unavailable, don't use */ 141 #define IMPS_GOINGDOWN 1 /* been told we go down soon */ 142 #define IMPS_INIT 2 /* coming up */ 143 #define IMPS_UP 3 /* ready to go */ 144 #define IMPS_RESET 4 /* reset in progress */ 145 146 #define IMPTV_DOWN (30*60) /* going down timer 30 secs */ 147 148 #ifdef IMPLEADERS 149 char *impleaders[IMPTYPE_READY+1] = { 150 "DATA", "BADLEADER", "DOWN", "bad", "NOOP", "RFNM", "HOSTDEAD", 151 "HOSTUNREACH", "BADDATA", "INCOMPLETE", "RESET", "RETRY", 152 "NOTIFY", "TRYING", "READY" 153 }; 154 #endif 155