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/*
Copyright 2001-2022 John Wiseman G8BPQ
This file is part of LinBPQ/BPQ32.
LinBPQ/BPQ32 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 3 of the License, or
(at your option) any later version.
LinBPQ/BPQ32 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.
You should have received a copy of the GNU General Public License
along with LinBPQ/BPQ32. If not, see http://www.gnu.org/licenses
*/
//
// C replacement for L2Code.asm
//
#define Kernel
#define _CRT_SECURE_NO_DEPRECATE
#pragma data_seg("_BPQDATA")
#include "time.h"
#include "stdio.h"
#include "CHeaders.h"
#include "tncinfo.h"
#define PFBIT 0x10 // POLL/FINAL BIT IN CONTROL BYTE
#define REJSENT 1 // SET WHEN FIRST REJ IS SENT IN REPLY
// TO AN I(P)
#define RNRSET 0x2 // RNR RECEIVED FROM OTHER END
#define DISCPENDING 8 // SEND DISC WHEN ALL DATA ACK'ED
#define RNRSENT 0x10 // WE HAVE SEND RNR
#define POLLSENT 0x20 // POLL BIT OUTSTANDING
#define ONEMINUTE 60*3
#define TENSECS 10*3
#define THREESECS 3*3
VOID L2Routine(struct PORTCONTROL * PORT, PMESSAGE Buffer);
MESSAGE * SETUPL2MESSAGE(struct _LINKTABLE * LINK, UCHAR CMD);
VOID SendSupervisCmd(struct _LINKTABLE * LINK);
void SEND_RR_RESP(struct _LINKTABLE * LINK, UCHAR PF);
VOID L2SENDRESPONSE(struct _LINKTABLE * LINK, int CMD);
VOID L2SENDCOMMAND(struct _LINKTABLE * LINK, int CMD);
VOID ACKMSG(struct _LINKTABLE * LINK);
VOID InformPartner(struct _LINKTABLE * LINK, int Reason);
UINT RR_OR_RNR(struct _LINKTABLE * LINK);
VOID L2TIMEOUT(struct _LINKTABLE * LINK, struct PORTCONTROL * PORT);
VOID CLEAROUTLINK(struct _LINKTABLE * LINK);
VOID SENDFRMR(struct _LINKTABLE * LINK);
char * SetupNodeHeader(struct DATAMESSAGE * Buffer);
VOID CLEARSESSIONENTRY(TRANSPORTENTRY * Session);
VOID SDFRMR(struct _LINKTABLE * LINK, struct PORTCONTROL * PORT);
VOID SDNRCHK(struct _LINKTABLE * LINK, UCHAR CTL);
VOID RESETNS(struct _LINKTABLE * LINK, UCHAR NS);
VOID PROC_I_FRAME(struct _LINKTABLE * LINK, struct PORTCONTROL * PORT, MESSAGE * Buffer);
VOID RESET2X(struct _LINKTABLE * LINK);
VOID RESET2(struct _LINKTABLE * LINK);
VOID CONNECTREFUSED(struct _LINKTABLE * LINK);
VOID SDUFRM(struct _LINKTABLE * LINK, struct PORTCONTROL * PORT, MESSAGE * Buffer, UCHAR CTL);
VOID SFRAME(struct _LINKTABLE * LINK, struct PORTCONTROL * PORT, UCHAR CTL, UCHAR MSGFLAG);
VOID SDIFRM(struct _LINKTABLE * LINK, struct PORTCONTROL * PORT, MESSAGE * Buffer, UCHAR CTL, UCHAR MSGFLAG);
VOID SENDCONNECTREPLY(struct _LINKTABLE * LINK);
VOID SETUPNEWL2SESSION(struct _LINKTABLE * LINK, struct PORTCONTROL * PORT, MESSAGE * Buffer, UCHAR MSGFLAG);
BOOL FindNeighbour(UCHAR * Call, int Port, struct ROUTE ** REQROUTE);
VOID L2SABM(struct _LINKTABLE * LINK, struct PORTCONTROL * PORT, MESSAGE * Buffer, MESSAGE * ADJBUFFER, UCHAR MSGFLAG);
VOID L2SENDUA(struct PORTCONTROL * PORT, MESSAGE * Buffer, MESSAGE * ADJBUFFER);
VOID L2SENDDM(struct PORTCONTROL * PORT, MESSAGE * Buffer, MESSAGE * ADJBUFFER);
VOID L2SENDRESP(struct PORTCONTROL * PORT, MESSAGE * Buffer, MESSAGE * ADJBUFFER, UCHAR CTL);
int COUNTLINKS(int Port);
VOID L2_PROCESS(struct _LINKTABLE * LINK, struct PORTCONTROL * PORT, MESSAGE * Buffer, UCHAR CTL, UCHAR MSGFLAG);
TRANSPORTENTRY * SetupSessionForL2(struct _LINKTABLE * LINK);
BOOL cATTACHTOBBS(TRANSPORTENTRY * Session, UINT Mask, int Paclen, int * AnySessions);
VOID PUT_ON_PORT_Q(struct PORTCONTROL * PORT, MESSAGE * Buffer);
VOID L2SWAPADDRESSES(MESSAGE * Buffer);
BOOL FindLink(UCHAR * LinkCall, UCHAR * OurCall, int Port, struct _LINKTABLE ** REQLINK);
VOID SENDSABM(struct _LINKTABLE * LINK);
VOID L2SENDXID(struct _LINKTABLE * LINK);
VOID __cdecl Debugprintf(const char * format, ...);
VOID Q_IP_MSG(MESSAGE * Buffer);
VOID PROCESSNODEMESSAGE(MESSAGE * Msg, struct PORTCONTROL * PORT);
VOID L2LINKACTIVE(struct _LINKTABLE * LINK, struct PORTCONTROL * PORT, MESSAGE * Buffer, MESSAGE * ADJBUFFER, UCHAR CTL, UCHAR MSGFLAG);
BOOL CompareAliases(UCHAR * c1, UCHAR * c2);
VOID L2FORUS(struct _LINKTABLE * LINK, struct PORTCONTROL * PORT, MESSAGE * Buffer, MESSAGE * ADJBUFFER, UCHAR CTL, UCHAR MSGFLAG);
VOID Digipeat(struct PORTCONTROL * PORT, MESSAGE * Buffer, UCHAR * OurCall, int toPort, int UIOnly);
VOID DigiToMultiplePorts(struct PORTCONTROL * PORTVEC, PMESSAGE Msg);
VOID MHPROC(struct PORTCONTROL * PORT, MESSAGE * Buffer);
BOOL CheckForListeningSession(struct PORTCONTROL * PORT, MESSAGE * Msg);
VOID L2SENDINVALIDCTRL(struct PORTCONTROL * PORT, MESSAGE * Buffer, MESSAGE * ADJBUFFER, UCHAR CTL);
UCHAR * SETUPADDRESSES(struct _LINKTABLE * LINK, PMESSAGE Msg);
VOID ProcessXIDCommand(struct _LINKTABLE * LINK, struct PORTCONTROL * PORT, MESSAGE * Buffer, MESSAGE * ADJBUFFER, UCHAR CTL, UCHAR MSGFLAG);
int CountBits(uint32_t in);
void AttachKISSHF(struct PORTCONTROL * PORT, MESSAGE * Buffer);
void DetachKISSHF(struct PORTCONTROL * PORT);
void KISSHFConnected(struct PORTCONTROL * PORT, struct _LINKTABLE * LINK);
void WriteConnectLog(char * fromcall, char * tocall, UCHAR * Mode);
int seeifInterlockneeded(struct PORTCONTROL * PORT);
int seeifUnlockneeded(struct _LINKTABLE * LINK);
int CheckKissInterlock(struct PORTCONTROL * MYPORT, int Exclusive);
void hookL2SessionAccepted(int Port, char * fromCall, char * toCall, struct _LINKTABLE * LINK);
void hookL2SessionDeleted(struct _LINKTABLE * LINK);
void hookL2SessionAttempt(int Port, char * fromCall, char * toCall, struct _LINKTABLE * LINK);
extern int REALTIMETICKS;
// MSGFLAG contains CMD/RESPONSE BITS
#define CMDBIT 4 // CURRENT MESSAGE IS A COMMAND
#define RESP 2 // CURRENT MSG IS RESPONSE
#define VER1 1 // CURRENT MSG IS VERSION 1
// FRMR REJECT FLAGS
#define SDINVC 1 // INVALID COMMAND
#define SDNRER 8 // INVALID N(R)
UCHAR NO_CTEXT = 0;
UCHAR ALIASMSG = 0;
extern UINT APPLMASK;
static UCHAR ISNETROMMSG = 0;
UCHAR MSGFLAG = 0;
extern char * ALIASPTR;
UCHAR QSTCALL[7] = {'Q'+'Q','S'+'S','T'+'T',0x40,0x40,0x40,0xe0}; // QST IN AX25
UCHAR NODECALL[7] = {0x9C, 0x9E, 0x88, 0x8A, 0xA6, 0x40, 0xE0}; // 'NODES' IN AX25 FORMAT
extern BOOL LogAllConnects;
APPLCALLS * APPL;
VOID L2Routine(struct PORTCONTROL * PORT, PMESSAGE Buffer)
{
// LEVEL 2 PROCESSING
MESSAGE * ADJBUFFER;
struct _LINKTABLE * LINK;
UCHAR * ptr;
int n;
UCHAR CTL;
uintptr_t Work;
UCHAR c;
// Check for invalid length (< 22 7Header + 7Addr + 7Addr + CTL
if (Buffer->LENGTH < (18 + sizeof(void *)))
{
Debugprintf("BPQ32 Bad L2 Msg Port %d Len %d", PORT->PORTNUMBER, Buffer->LENGTH);
ReleaseBuffer(Buffer);
return;
}
PORT->L2FRAMES++;
ALIASMSG = 0;
APPLMASK = 0;
ISNETROMMSG = 0;
MSGFLAG = 0; // CMD/RESP UNDEFINED
// Check for Corrupted Callsign in Origin (to keep MH list clean)
ptr = &Buffer->ORIGIN[0];
n = 6;
c = *(ptr) >> 1;
if (c == ' ') // Blank Call
{
Debugprintf("BPQ32 Blank Call Port %d", PORT->PORTNUMBER);
ReleaseBuffer(Buffer);
return;
}
while(n--)
{
// Try a bit harder to detect corruption
c = *(ptr++);
if (c & 1)
{
ReleaseBuffer(Buffer);
return;
}
c = c >> 1;
if (!isalnum(c) && !(c == '#') && !(c == ' '))
{
ReleaseBuffer(Buffer);
return;
}
}
// Check Digis if present
if ((Buffer->ORIGIN[6] & 1) == 0) // Digis
{
ptr = &Buffer->CTL;
n = 6;
while(n--)
{
c = *(ptr++);
if (c & 1)
{
ReleaseBuffer(Buffer);
return;
}
c = c >> 1;
if (!isalnum(c) && !(c == '#') && !(c == ' '))
{
ReleaseBuffer(Buffer);
return;
}
}
}
BPQTRACE(Buffer, TRUE); // TRACE - RX frames to APRS
if (PORT->PORTMHEARD)
MHPROC(PORT, Buffer);
/// TAJ added 07/12/2020 for 'all RX traffic as IfinOctects
InOctets[PORT->PORTNUMBER] += Buffer->LENGTH - MSGHDDRLEN;
// CHECK THAT ALL DIGIS HAVE BEEN ACTIONED,
// AND ADJUST FOR DIGIPEATERS IF PRESENT
n = 8; // MAX DIGIS
ptr = &Buffer->ORIGIN[6]; // End of Address bit
while ((*ptr & 1) == 0)
{
// MORE TO COME
ptr += 7;
if ((*ptr & 0x80) == 0) // Digi'd bit
{
// FRAME HAS NOT BEEN REPEATED THROUGH CURRENT DIGI -
// SEE IF WE ARE MEANT TO DIGI IT
struct XDIGI * XDigi = PORT->XDIGIS; // Cross port digi setup
ptr -= 6; // To start of Call
if (CompareCalls(ptr, MYCALL) || CompareAliases(ptr, MYALIAS) ||
CompareCalls(ptr, PORT->PORTALIAS) || CompareCalls(ptr, PORT->PORTALIAS2))
{
Digipeat(PORT, Buffer, ptr, 0, 0); // Digi it (if enabled)
return;
}
while (XDigi)
{
if (CompareCalls(ptr, XDigi->Call))
{
Digipeat(PORT, Buffer, ptr, XDigi->Port, XDigi->UIOnly); // Digi it (if enabled)
return;
}
XDigi = XDigi->Next;
}
ReleaseBuffer(Buffer);
return; // not complete and not for us
}
n--;
if (n == 0)
{
ReleaseBuffer(Buffer);
return; // Corrupt - no end of address bit
}
}
// Reached End of digis, and all actioned, so can process it
Work = (uintptr_t)&Buffer->ORIGIN[6];
ptr -= Work; // ptr is now length of digis
Work = (uintptr_t)Buffer;
ptr += Work;
ADJBUFFER = (MESSAGE * )ptr; // ADJBUFFER points to CTL, etc. allowing for digis
// GET CMD/RESP BITS
if (Buffer->DEST[6] & 0x80)
{
if (Buffer->ORIGIN[6] & 0x80) // Both set, assume V1
MSGFLAG |= VER1;
else
MSGFLAG |= CMDBIT;
}
else
{
if (Buffer->ORIGIN[6] & 0x80) // Only Dest Set
MSGFLAG |= RESP;
else
MSGFLAG |= VER1; // Neither, assume V1
}
// SEE IF FOR AN ACTIVE LINK SESSION
CTL = ADJBUFFER->CTL;
// IF A UI, THERE IS NO SESSION
if (FindLink(Buffer->ORIGIN, Buffer->DEST, PORT->PORTNUMBER, &LINK))
{
L2LINKACTIVE(LINK, PORT, Buffer,ADJBUFFER, CTL, MSGFLAG);
return;
}
// NOT FOR ACTIVE LINK - SEE IF ADDRESSED TO OUR ADDRESSES
// FIRST TRY PORT ADDR/ALIAS
if(PORT->PORTBBSFLAG == 1)
goto PORTCALLISBBS; // PORT CALL/ALIAS ARE FOR BBS
if (NODE)
goto USING_NODE;
PORTCALLISBBS:
// NODE IS NOT ACTIVE, SO PASS CALLS TO PORTCALL/ALIAS TO BBS
APPLMASK = 1;
if (CompareCalls(Buffer->DEST, NETROMCALL))
{
ISNETROMMSG = 1;
goto FORUS;
}
if (PORT->PORTL3FLAG) // L3 Only Port?
goto NOTFORUS; // If L3ONLY, only accept calls to NETROMCALL
ISNETROMMSG = 0;
USING_NODE:
if (CompareCalls(Buffer->DEST, PORT->PORTCALL))
goto FORUS;
ALIASMSG = 1;
if (CompareAliases(Buffer->DEST, PORT->PORTALIAS)) // only compare 6 bits - allow any ssid
goto FORUS;
if (NODE == 0)
goto TRYBBS; // NOT USING NODE SYSTEM
ALIASMSG = 0;
if (CompareCalls(Buffer->DEST, MYCALL))
goto FORUS;
ALIASMSG = 1;
if (CompareAliases(Buffer->DEST, MYALIAS)) // only compare 6 bits - allow any ssid
goto FORUS;
TRYBBS:
if (BBS == 0)
goto NOWTRY_NODES; // NOT USING BBS CALLS
// TRY APPLICATION CALLSIGNS/ALIASES
APPLMASK = 1;
ALIASPTR = &CMDALIAS[0][0];
n = NumberofAppls;
APPL = APPLCALLTABLE;
while (n--)
{
if (APPL->APPLCALL[0] > 0x40) // Valid ax.25 addr
{
// WE MAY NOT BE ALLOWED TO USE THE BBS CALL ON SOME BANDS DUE TO
// THE RATHER ODD UK LICENCING RULES!
// For backward compatibility only apply to appl 1
if ((PORT->PERMITTEDAPPLS & APPLMASK) != 0)
{
ALIASMSG = 0;
if (CompareCalls(Buffer->DEST, APPL->APPLCALL))
goto FORUS;
ALIASMSG = 1;
if (CompareAliases(Buffer->DEST, APPL->APPLALIAS)) // only compare 6 bits - allow any ssid
goto FORUS;
if (CompareAliases(Buffer->DEST, APPL->L2ALIAS)) // only compare 6 bits - allow any ssid
goto FORUS;
}
}
APPLMASK <<= 1;
ALIASPTR += ALIASLEN;
APPL++;
}
// NOT FOR US - SEE IF 'NODES' OR IP/ARP BROADCAST MESSAGE
NOWTRY_NODES:
if (CompareCalls(Buffer->DEST, QSTCALL))
{
Q_IP_MSG(Buffer); // IP BROADCAST
return;
}
if (ADJBUFFER->PID != 0xCF) // NETROM MSG?
goto NOTFORUS; // NO
if (CompareCalls(Buffer->DEST, NODECALL))
{
if (Buffer->L2DATA[0] == 0xff) // Valid NODES Broadcast
{
PROCESSNODEMESSAGE(Buffer, PORT);
}
}
ReleaseBuffer(Buffer);
return;
NOTFORUS:
//
// MAY JUST BE A REPLY TO A 'PRIMED' CQ CALL
//
if ((CTL & ~PFBIT) == SABM)
if (CheckForListeningSession(PORT, Buffer))
return; // Used buffer to send UA
ReleaseBuffer(Buffer);
return;
FORUS:
// if a UI frame and UIHook Specified, call it
if (PORT->UIHook && CTL == 3)
PORT->UIHook(LINK, PORT, Buffer, ADJBUFFER, CTL, MSGFLAG);
L2FORUS(LINK, PORT, Buffer, ADJBUFFER, CTL, MSGFLAG);
}
VOID MHPROC(struct PORTCONTROL * PORT, MESSAGE * Buffer)
{
PMHSTRUC MH = PORT->PORTMHEARD;
PMHSTRUC MHBASE = MH;
int i;
int OldCount = 0;
char Freq[64] = "";
char DIGI = '*';
double ReportFreq = 0;
// if port has a freq associated with it use it
GetPortFrequency(PORT->PORTNUMBER, Freq);
// if (Buffer->ORIGIN[6] & 1)
DIGI = 0; // DOn't think we want to do this
// See if in list
for (i = 0; i < MHENTRIES; i++)
{
if ((MH->MHCALL[0] == 0) || (CompareCalls(Buffer->ORIGIN, MH->MHCALL) && MH->MHDIGI == DIGI)) // Spare or our entry
{
OldCount = MH->MHCOUNT;
goto DoMove;
}
MH++;
}
// TABLE FULL AND ENTRY NOT FOUND - MOVE DOWN ONE, AND ADD TO TOP
i = MHENTRIES - 1;
// Move others down and add at front
DoMove:
if (i != 0) // First
memmove(MHBASE + 1, MHBASE, i * sizeof(MHSTRUC));
memcpy (MHBASE->MHCALL, Buffer->ORIGIN, 7 * 9); // Save Digis
MHBASE->MHDIGI = DIGI;
MHBASE->MHTIME = time(NULL);
MHBASE->MHCOUNT = ++OldCount;
strcpy(MHBASE->MHFreq, Freq);
MHBASE->MHLocator[0] = 0;
return;
}
int CountFramesQueuedOnSession(TRANSPORTENTRY * Session)
{
// COUNT NUMBER OF FRAMES QUEUED ON A SESSION
if (Session == 0)
return 0;
if (Session->L4CIRCUITTYPE & BPQHOST)
{
return C_Q_COUNT(&Session->L4TX_Q);
}
if (Session->L4CIRCUITTYPE & SESSION)
{
// L4 SESSION - GET NUMBER UNACKED, AND ADD NUMBER ON TX QUEUE
int Count = C_Q_COUNT(&Session->L4TX_Q);
UCHAR Unacked = Session->TXSEQNO - Session->L4WS;
return Count + Unacked;
}
if (Session->L4CIRCUITTYPE & PACTOR)
{
// PACTOR Type - Frames are queued on the Port Entry
struct PORTCONTROL * PORT = Session->L4TARGET.PORT;
EXTPORTDATA * EXT = (EXTPORTDATA *)PORT;
int ret = EXT->FramesQueued;
// Check L4 Queue as messages can stay there briefly
ret += C_Q_COUNT(&Session->L4RX_Q);
return ret + C_Q_COUNT(&PORT->PORTTX_Q);
}
// L2 CIRCUIT
{
int SessCount = C_Q_COUNT(&Session->L4TX_Q);
struct _LINKTABLE * LINK = Session->L4TARGET.LINK;
int L2 = COUNT_AT_L2(LINK);
return SessCount + L2;
}
}
int CHECKIFBUSYL2(TRANSPORTENTRY * Session)
{
// RETURN TOP BIT OF AL SET IF SESSION PARTNER IS BUSY
if (Session->L4CROSSLINK) // CONNECTED?
{
Session = Session->L4CROSSLINK;
if (CountFramesQueuedOnSession(Session) > 10)
return L4BUSY;;
}
return 0;
}
VOID L2FORUS(struct _LINKTABLE * LINK, struct PORTCONTROL * PORT, MESSAGE * Buffer, MESSAGE * ADJBUFFER, UCHAR CTL, UCHAR MSGFLAG)
{
// MESSAGE ADDRESSED TO OUR CALL OR ALIAS, BUT NOT FOR AN ACTIVE SESSION
// LINK points to an empty link table entry
struct ROUTE * ROUTE;
int CTLlessPF = CTL & ~PFBIT;
PORT->L2FRAMESFORUS++;
NO_CTEXT = 0;
// ONLY SABM or UI ALLOWED IF NO SESSION
// Plus XID/TEST/SABME if V2.2 support enabled
if (CTLlessPF == 3) // UI
{
// A UI ADDRESSED TO US - SHOULD ONLY BE FOR IP, or possibly addressed NODES
switch(ADJBUFFER->PID)
{
case 0xcf: // Netrom
if (Buffer->L2DATA[0] == 0xff) // NODES
PROCESSNODEMESSAGE(Buffer, PORT);
break;
case 0xcc: // TCP
case 0xcd: // ARP
case 0x08: // NOS FRAGMENTED AX25 TCP/IP
Q_IP_MSG( Buffer);
return;
}
ReleaseBuffer(Buffer);
return;
}
if (PORT->PortUIONLY) // Port is for UI only
{
ReleaseBuffer(Buffer);
return;
}
if (CTLlessPF == SABME)
{
// Although some say V2.2 requires SABME I don't agree!
// Reject until we support Mod 128
L2SENDINVALIDCTRL(PORT, Buffer, ADJBUFFER, CTL);
return;
}
if (CTLlessPF == SREJ) // Used to see if other end supports SREJ on 2.0
{
// Send FRMR if dont support SREJ
// Send DM if we do
if (SUPPORT2point2)
L2SENDRESP(PORT, Buffer, ADJBUFFER, DM);
else
L2SENDINVALIDCTRL(PORT, Buffer, ADJBUFFER, CTL);
return;
}
if (CTLlessPF == XID)
{
// Send FRMR if we only support V 2.0
if (SUPPORT2point2 == FALSE)
{
L2SENDINVALIDCTRL(PORT, Buffer, ADJBUFFER, CTL);
return;
}
// if Support 2.2 drop through
}
if (CTLlessPF == TEST)
{
// I can't see amy harm in replying to TEST
L2SENDRESP(PORT, Buffer, ADJBUFFER, TEST);
return;
}
// if (CTLlessPF != SABM && CTLlessPF != SABME)
if (CTLlessPF != SABM && CTLlessPF != XID)
{
if ((MSGFLAG & CMDBIT) && (CTL & PFBIT)) // Command with P?
L2SENDDM(PORT, Buffer, ADJBUFFER);
else
ReleaseBuffer(Buffer); // Ignore if not
return;
}
// Exclude and limit tests are done for XID and SABM
if (NODE == 0 && BBS == 0) // Don't want any calls
{
ReleaseBuffer(Buffer);
return;
}
#ifdef EXCLUDEBITS
// CHECK ExcludeList
if (CheckExcludeList(Buffer->ORIGIN) == 0)
{
ReleaseBuffer(Buffer);
return;
}
#endif
// IF WE HAVE A PERMITTED CALLS LIST, SEE IF HE IS IN IT
if (PORT->PERMITTEDCALLS)
{
UCHAR * ptr = PORT->PERMITTEDCALLS;
while (TRUE)
{
if (memcmp(Buffer->ORIGIN, ptr, 6) == 0) // Ignore SSID
break;
ptr += 7;
if ((*ptr) == 0) // Not in list
{
ReleaseBuffer(Buffer);
return;
}
}
}
// IF CALL REQUEST IS FROM A LOCKED NODE WITH QUALITY ZERO, IGNORE IT
if (FindNeighbour(Buffer->ORIGIN, PORT->PORTNUMBER, &ROUTE))
{
// From a known node
NO_CTEXT = 1;
if (ROUTE->NEIGHBOUR_FLAG == 1 && ROUTE->NEIGHBOUR_QUAL == 0) // Locked, qual 0
{
ReleaseBuffer(Buffer);
return;
}
}
// CHECK PORT CONNECT LIMITS
if (PORT->USERS)
{
if (COUNTLINKS(PORT->PORTNUMBER) >= PORT->USERS)
{
L2SENDDM(PORT, Buffer, ADJBUFFER);
return;
}
}
// if KISSHF, check if attached. If so, reject. If not, attach.
if (PORT->TNC && PORT->TNC->Hardware == H_KISSHF)
{
struct TNCINFO * TNC = PORT->TNC;
if (TNC->PortRecord->ATTACHEDSESSIONS[0])
{
L2SENDDM(PORT, Buffer, ADJBUFFER);
return;
}
}
// OK to accept SABM or XID
if (CTLlessPF == XID)
{
ProcessXIDCommand(LINK, PORT, Buffer, ADJBUFFER, CTL, MSGFLAG);
return;
}
// Not XID, so must be SABM
L2SABM(LINK, PORT, Buffer, ADJBUFFER, MSGFLAG); // Process the SABM
}
VOID ProcessXIDCommand(struct _LINKTABLE * LINK, struct PORTCONTROL * PORT, MESSAGE * Buffer, MESSAGE * ADJBUFFER, UCHAR CTL, UCHAR MSGFLAG)
{
// I think it is fairly safe to accept XID as soon as we
// can process SREJ, but only accept Mod 8 and 256 Byte frames
// I think the only way to run 2.2 Mod 8 is to preceed a
// SABM with XID, but others don't seem to agree!
// Run through XID fields, changing any we don't like,
// then return an XID response
// Decode and process XID
UCHAR * ptr = &ADJBUFFER->PID;
UCHAR * ptr1, * ptr2;
UCHAR TEMPDIGI[57];
int n;
// Check Interlock - should we also check exclude etc?. No, checked in L2FORUS
if (CheckKissInterlock(PORT, TRUE)) // Interlock with ARDOP/VARA etc
{
L2SENDDM(PORT, Buffer, ADJBUFFER);
return;
}
if (*ptr++ == 0x82 && *ptr++ == 0x80)
{
int Type;
int Len;
unsigned int value;
int xidlen = *(ptr++) << 8;
xidlen += *ptr++;
// XID is set of Type, Len, Value n-tuples
while (xidlen > 0)
{
Type = *ptr++;
Len = *ptr++;
value = 0;
xidlen -= (Len + 2);
while (Len--)
{
value <<=8;
value += *ptr++;
}
switch(Type)
{
case 2: //Bin fields
break;
case 3:
if ((value & OPMustHave) != OPMustHave)
goto BadXID;
if ((value & OPMod8) == 0)
goto BadXID;
if ((value & OPSREJMult) == 0)
goto BadXID;
// Reply Mod 8 SREJMULTI
value = OPMustHave | OPSREJMult | OPMod8;
ptr -=3;
*ptr++ = value >> 16;
*ptr++ = value >> 8;
*ptr++ = value;
break;
case 6: //RX Size
break;
case 8: //RX Window
break;
}
}
// Send back as XID response
LINK->L2STATE = 1; // XID received
LINK->Ver2point2 = TRUE; // Must support 2.2 if sent XID
LINK->L2TIME = PORT->PORTT1;
LINK->LINKPORT = PORT;
// save calls so we can match up SABM when it comes
memcpy(LINK->LINKCALL, Buffer->ORIGIN, 7);
LINK->LINKCALL[6] &= 0x1e; // Mask SSID
memcpy(LINK->OURCALL, Buffer->DEST, 7);
LINK->OURCALL[6] &= 0x1e; // Mask SSID
memset(LINK->DIGIS, 0, 56); // CLEAR DIGI FIELD IN CASE RECONNECT
if ((Buffer->ORIGIN[6] & 1) == 0) // End of Address
{
// THERE ARE DIGIS TO PROCESS - COPY TO WORK AREA reversed, THEN COPY BACK
memset(TEMPDIGI, 0, 57); // CLEAR DIGI FIELD IN CASE RECONNECT
ptr1 = &Buffer->ORIGIN[6]; // End of add
ptr2 = &TEMPDIGI[7 * 7]; // Last Temp Digi
while((*ptr1 & 1) == 0) // End of address bit
{
ptr1++;
memcpy(ptr2, ptr1, 7);
ptr2[6] &= 0x1e; // Mask Repeated and Last bits
ptr2 -= 7;
ptr1 += 6;
}
// LIST OF DIGI CALLS COMPLETE - COPY TO LINK CONTROL ENTRY
n = PORT->PORTMAXDIGIS;
ptr1 = ptr2 + 7; // First in TEMPDIGIS
ptr2 = &LINK->DIGIS[0];
while (*ptr1)
{
if (n == 0)
{
// Too many for us
CLEAROUTLINK(LINK);
ReleaseBuffer(Buffer);
return;
}
memcpy(ptr2, ptr1, 7);
ptr1 += 7;
ptr2 += 7;
n--;
}
}
ADJBUFFER->CTL = CTL | PFBIT;
// Buffer->LENGTH = (UCHAR *)ADJBUFFER - (UCHAR *)Buffer + MSGHDDRLEN + 15; // SET UP BYTE COUNT
L2SWAPADDRESSES(Buffer); // SWAP ADDRESSES AND SET RESP BITS
// We need to save APPLMASK and ALIASPTR so following SABM connects to application
LINK->APPLMASK = APPLMASK;
LINK->ALIASPTR = ALIASPTR;
PUT_ON_PORT_Q(PORT, Buffer);
return;
}
BadXID:
L2SENDINVALIDCTRL(PORT, Buffer, ADJBUFFER, CTL);
return;
}
int COUNTLINKS(int Port)
{
//COUNT LINKS ON PORT
int i = MAXLINKS, n = 0;
struct _LINKTABLE * LINK = LINKS;
while (i--)
{
if (LINK->LINKPORT && LINK->LINKPORT->PORTNUMBER == Port)
n++;
LINK++;
}
return n;
}
VOID L2LINKACTIVE(struct _LINKTABLE * LINK, struct PORTCONTROL * PORT, MESSAGE * Buffer, MESSAGE * ADJBUFFER, UCHAR CTL, UCHAR MSGFLAG)
{
// MESSAGE ON AN ACTIVE LINK
int CTLlessPF = CTL & ~PFBIT;
PORT->L2FRAMESFORUS++;
// ONLY SABM or UI ALLOWED IF NO SESSION
if (CTLlessPF == 3) // UI
{
// A UI ADDRESSED TO US - SHOULD ONLY BE FOR IP, or possibly addressed NODES
switch(ADJBUFFER->PID)
{
case 0xcf: // Netrom
if (Buffer->L2DATA[0] == 0xff) // NODES
PROCESSNODEMESSAGE(Buffer, PORT);
break;
case 0xcc: // TCP
case 0xcd: // ARP
case 0x08: // NOS FRAGMENTED AX25 TCP/IP
Q_IP_MSG( Buffer);
return;
}
ReleaseBuffer(Buffer);
return;
}
if (CTLlessPF == DISC)
{
InformPartner(LINK, NORMALCLOSE); // SEND DISC TO OTHER END
CLEAROUTLINK(LINK);
L2SENDUA(PORT, Buffer, ADJBUFFER);
if (PORT->TNC && PORT->TNC->Hardware == H_KISSHF)
DetachKISSHF(PORT);
return;
}
if (LINK->L2STATE == 1)
{
// XID State. Should be XID response if 2.2 ok or DM/FRMR if not
if (MSGFLAG & RESP)
{
if (CTLlessPF == DM || CTLlessPF == FRMR)
{
// Doesn't support XID - Send SABM
LINK->L2STATE = 2;
LINK->Ver2point2 = FALSE;
LINK->L2TIMER = 1; // USe retry to send SABM
}
else if (CTLlessPF == XID)
{
// Process response to make sure ok, Send SABM or DISC
LINK->L2STATE = 2;
LINK->Ver2point2 = TRUE;// Must support 2.2 if responded to XID
LINK->L2TIMER = 1; // USe retry to send SABM
}
ReleaseBuffer(Buffer);
return;
}
// Command on existing session. Could be due to other end missing
// the XID response, so if XID just resend response
}
if (CTLlessPF == XID && (MSGFLAG & CMDBIT))
{
// XID Command on active session. Other end may be restarting. Send Response
ProcessXIDCommand(LINK, PORT, Buffer, ADJBUFFER, CTL, MSGFLAG);
return;
}
if (CTLlessPF == SABM)
{
// SABM ON EXISTING SESSION - IF DISCONNECTING, REJECT
if (LINK->L2STATE == 1) // Sent XID?
{
APPLMASK = LINK->APPLMASK;
ALIASPTR = LINK->ALIASPTR;
L2SABM(LINK, PORT, Buffer, ADJBUFFER, MSGFLAG); // Process the SABM
return;
}
if (LINK->L2STATE == 4) // DISCONNECTING?
{
L2SENDDM(PORT, Buffer, ADJBUFFER);
return;
}
// THIS IS A SABM ON AN EXISTING SESSION
// THERE ARE SEVERAL POSSIBILITIES:
// 1. RECONNECT COMMAND TO TNC
// 2. OTHER END THINKS LINK HAS DIED
// 3. RECOVERY FROM FRMR CONDITION
// 4. REPEAT OF ORIGINAL SABM COS OTHER END MISSED UA
// FOR 1-3 IT IS REASONABLE TO FULLY RESET THE CIRCUIT, BUT IN 4
// SUCH ACTION WILL LOSE THE INITIAL SIGNON MSG IF CONNECTING TO A
// BBS. THE PROBLEM IS TELLING THE DIFFERENCE. I'M GOING TO SET A FLAG
// WHEN FIRST INFO RECEIVED - IF SABM REPEATED BEFORE THIS, I'LL ASSUME
// CONDITION 4, AND JUST RESEND THE UA
if (LINK->SESSACTIVE == 0) // RESET OF ACTIVE CIRCUIT?
{
L2SENDUA(PORT, Buffer, ADJBUFFER); // No, so repeat UA
return;
}
InformPartner(LINK, NORMALCLOSE); // SEND DISC TO OTHER END
LINK->CIRCUITPOINTER = 0;
L2SABM(LINK, PORT, Buffer, ADJBUFFER, MSGFLAG); // Process the SABM
return;
}
L2_PROCESS(LINK, PORT, Buffer, CTL, MSGFLAG);
}
VOID L2SABM(struct _LINKTABLE * LINK, struct PORTCONTROL * PORT, MESSAGE * Buffer, MESSAGE * ADJBUFFER, UCHAR MSGFLAG)
{
// SET UP NEW SESSION (OR RESET EXISTING ONE)
TRANSPORTENTRY * Session;
int CONERROR;
char toCall[12], fromCall[12];
if (LINK == 0) // NO LINK ENTRIES - SEND DM RESPONSE
{
L2SENDDM(PORT, Buffer, ADJBUFFER);
return;
}
if (CheckKissInterlock(PORT, TRUE)) // Interlock with ARDOP/VARA etc
{
L2SENDDM(PORT, Buffer, ADJBUFFER);
return;
}
toCall[ConvFromAX25(ADJBUFFER->DEST, toCall)] = 0;
fromCall[ConvFromAX25(ADJBUFFER->ORIGIN, fromCall)] = 0;
SETUPNEWL2SESSION(LINK, PORT, Buffer, MSGFLAG);
if (LINK->L2STATE != 5) // Setup OK?
{
L2SENDDM(PORT, Buffer, ADJBUFFER); // Failed
return;
}
// See if need to Interlock non-sharable modes, eg ARDOP and VARA
seeifInterlockneeded(PORT);
// IF CONNECT TO APPL ADDRESS, SET UP APPL SESSION
if (APPLMASK == 0)
{
// Not ATTACH TO APPL
// Send CTEXT if connect to NODE/Port Alias, or NODE/Port Call, and FULL_CTEXT set
// Dont sent to known NODEs, or appl connects
struct DATAMESSAGE * Msg;
int Totallen = 0;
int Paclen= PORT->PORTPACLEN;
UCHAR * ptr;
if (LogAllConnects)
WriteConnectLog(fromCall, toCall, "AX.25");
hookL2SessionAccepted(PORT->PORTNUMBER, fromCall, toCall, LINK);
L2SENDUA(PORT, Buffer, ADJBUFFER);
if (PORT->TNC && PORT->TNC->Hardware == H_KISSHF)
AttachKISSHF(PORT, Buffer);
if (NO_CTEXT == 1)
return;
if (FULL_CTEXT == 0 && !ALIASMSG) // Any connect, or call to alias
return;
// if Port CTEXT defined, use it
if (PORT->CTEXT)
{
Totallen = strlen(PORT->CTEXT);
ptr = PORT->CTEXT;
}
else if (CTEXTLEN)
{
Totallen = CTEXTLEN;
ptr = CTEXTMSG;
}
else
return;
if (Paclen == 0)
Paclen = PACLEN;
while(Totallen)
{
Msg = GetBuff();
if (Msg == NULL)
break; // No Buffers
Msg->PID = 0xf0;
if (Paclen > Totallen)
Paclen = Totallen;
memcpy(Msg->L2DATA, ptr, Paclen);
Msg->LENGTH = Paclen + MSGHDDRLEN + 1;
C_Q_ADD(&LINK->TX_Q, Msg);
ptr += Paclen;
Totallen -= Paclen;
}
return;
}
// Connnect to APPL
if (LINK->LINKTYPE != 1)
{
L2SENDUA(PORT, Buffer, ADJBUFFER); // RESET OF DOWN/CROSSLINK
return;
}
if (LINK->CIRCUITPOINTER)
{
L2SENDUA(PORT, Buffer, ADJBUFFER); // ALREADY SET UP - MUST BE REPEAT OF SABM OR LINK RESET
return;
}
// IF RUNNING ONLY BBS (NODE=0), THIS MAY BE EITHER A USER OR NODE
// TRYING TO SET UP A L4 CIRCUIT - WE DONT WANT TO ATTACH A NODE TO
// THE BBS!
if (NODE == 0)
{
// NOW THINGS GET DIFICULT - WE MUST EITHER WAIT TO SEE IF A PID CF MSG
// ARRIVES, OR ASSUME ALL NODES ARE IN NEIGHBOURS - I'LL TRY THE LATTER
// AND SEE HOW IT GOES. tHIS MEANS THAT YOU MUST DEFINE ALL ROUTES
// IN CONFIG FILE
struct ROUTE * ROUTE;
if (FindNeighbour(Buffer->ORIGIN, PORT->PORTNUMBER, &ROUTE))
{
// It's a node
L2SENDUA(PORT, Buffer, ADJBUFFER); // ALREADY SET UP - MUST BE REPEAT OF SABM OR LINK RESET
return;
}
}
Session = SetupSessionForL2(LINK); // CREATE INCOMING L4 SESSION
if (Session == NULL)
{
CLEAROUTLINK(LINK);
if (PORT->TNC && PORT->TNC->Hardware == H_KISSHF)
DetachKISSHF(PORT);
L2SENDDM(PORT, Buffer, ADJBUFFER);
return;
}
// NOW TRY A BBS CONNECT
// IF APPL CONNECT, SEE IF APPL HAS AN ALIAS
if (ALIASPTR[0] > ' ')
{
struct DATAMESSAGE * Msg;
// ACCEPT THE CONNECT, THEN INVOKE THE ALIAS
L2SENDUA(PORT, Buffer, ADJBUFFER);
hookL2SessionAccepted(PORT->PORTNUMBER, fromCall, toCall, LINK);
if (PORT->TNC && PORT->TNC->Hardware == H_KISSHF)
{
struct DATAMESSAGE * Msg;
int Totallen = 0;
int Paclen= PORT->PORTPACLEN;
UCHAR * ptr;
AttachKISSHF(PORT, Buffer);
// if Port CTEXT defined, use it
if (PORT->CTEXT)
{
Totallen = strlen(PORT->CTEXT);
ptr = PORT->CTEXT;
}
else if (HFCTEXTLEN)
{
Totallen = HFCTEXTLEN;
ptr = HFCTEXT;
}
if (Paclen == 0)
Paclen = PACLEN;
while(Totallen)
{
Msg = GetBuff();
if (Msg == NULL)
break; // No Buffers
Msg->PID = 0xf0;
if (Paclen > Totallen)
Paclen = Totallen;
memcpy(Msg->L2DATA, ptr, Paclen);
Msg->LENGTH = Paclen + MSGHDDRLEN + 1;
C_Q_ADD(&LINK->TX_Q, Msg);
ptr += Paclen;
Totallen -= Paclen;
}
}
if (LogAllConnects)
{
char toCall[12], fromCall[12];
toCall[ConvFromAX25(ADJBUFFER->DEST, toCall)] = 0;
fromCall[ConvFromAX25(ADJBUFFER->ORIGIN, fromCall)] = 0;
WriteConnectLog(fromCall, toCall, "AX.25");
}
Msg = GetBuff();
if (Msg)
{
Msg->PID = 0xf0;
memcpy(Msg->L2DATA, ALIASPTR, 12);
Msg->L2DATA[12] = 13;
Msg->LENGTH = MSGHDDRLEN + 12 + 2; // 2 for PID and CR
C_Q_ADD(&LINK->RX_Q, Msg);
}
return;
}
if (cATTACHTOBBS(Session, APPLMASK, PORT->PORTPACLEN, &CONERROR) == 0)
{
// NO BBS AVAILABLE
CLEARSESSIONENTRY(Session);
CLEAROUTLINK(LINK);
if (PORT->TNC && PORT->TNC->Hardware == H_KISSHF)
DetachKISSHF(PORT);
L2SENDDM(PORT, Buffer, ADJBUFFER);
return;
}
if (LogAllConnects)
{
char toCall[12], fromCall[12];
toCall[ConvFromAX25(ADJBUFFER->DEST, toCall)] = 0;
fromCall[ConvFromAX25(ADJBUFFER->ORIGIN, fromCall)] = 0;
WriteConnectLog(fromCall, toCall, "AX.25");
}
L2SENDUA(PORT, Buffer, ADJBUFFER);
hookL2SessionAccepted(PORT->PORTNUMBER, fromCall, toCall, LINK);
if (PORT->TNC && PORT->TNC->Hardware == H_KISSHF)
{
struct DATAMESSAGE * Msg;
int Totallen = 0;
int Paclen= PORT->PORTPACLEN;
UCHAR * ptr;
AttachKISSHF(PORT, Buffer);
// if Port CTEXT defined, use it
if (PORT->CTEXT)
{
Totallen = strlen(PORT->CTEXT);
ptr = PORT->CTEXT;
}
else if (HFCTEXTLEN)
{
Totallen = HFCTEXTLEN;
ptr = HFCTEXT;
}
else
return;
if (Paclen == 0)
Paclen = PACLEN;
while(Totallen)
{
Msg = GetBuff();
if (Msg == NULL)
break; // No Buffers
Msg->PID = 0xf0;
if (Paclen > Totallen)
Paclen = Totallen;
memcpy(Msg->L2DATA, ptr, Paclen);
Msg->LENGTH = Paclen + MSGHDDRLEN + 1;
C_Q_ADD(&LINK->TX_Q, Msg);
ptr += Paclen;
Totallen -= Paclen;
}
return;
}
}
VOID SETUPNEWL2SESSION(struct _LINKTABLE * LINK, struct PORTCONTROL * PORT, MESSAGE * Buffer, UCHAR MSGFLAG)
{
// COPY ADDRESS INFO TO LINK TABLE
UCHAR * ptr1, * ptr2;
UCHAR TEMPDIGI[57];
int n;
memcpy(LINK->LINKCALL, Buffer->ORIGIN, 7);
LINK->LINKCALL[6] &= 0x1e; // Mask SSID
memcpy(LINK->OURCALL, Buffer->DEST, 7);
LINK->OURCALL[6] &= 0x1e; // Mask SSID
memset(LINK->DIGIS, 0, 56); // CLEAR DIGI FIELD IN CASE RECONNECT
LINK->L2TIME = PORT->PORTT1; // Set tomeoiut for no digis
if ((Buffer->ORIGIN[6] & 1) == 0) // End of Address
{
// THERE ARE DIGIS TO PROCESS - COPY TO WORK AREA reversed, THEN COPY BACK
memset(TEMPDIGI, 0, 57); // CLEAR DIGI FIELD IN CASE RECONNECT
ptr1 = &Buffer->ORIGIN[6]; // End of add
ptr2 = &TEMPDIGI[7 * 7]; // Last Temp Digi
while((*ptr1 & 1) == 0) // End of address bit
{
ptr1++;
memcpy(ptr2, ptr1, 7);
ptr2[6] &= 0x1e; // Mask Repeated and Last bits
ptr2 -= 7;
ptr1 += 6;
}
// LIST OF DIGI CALLS COMPLETE - COPY TO LINK CONTROL ENTRY
n = PORT->PORTMAXDIGIS;
ptr1 = ptr2 + 7; // First in TEMPDIGIS
ptr2 = &LINK->DIGIS[0];
while (*ptr1)
{
if (n == 0)
{
// Too many for us
CLEAROUTLINK(LINK);
return;
}
memcpy(ptr2, ptr1, 7);
ptr1 += 7;
ptr2 += 7;
n--;
LINK->L2TIME += PORT->PORTT1; // Adjust timeout for digis
}
}
// THIS MAY BE RESETTING A LINK - BEWARE OF CONVERTING A CROSSLINK TO
// AN UPLINK AND CONFUSING EVERYTHING
LINK->LINKPORT = PORT;
if (LINK->LINKTYPE == 0)
{
if (ISNETROMMSG && NODE == 0) // Only allow crosslink if node = 0
LINK->LINKTYPE = 3; // Crosslink
else
LINK->LINKTYPE = 1; // Uplink
}
LINK->L2TIMER = 0; // CANCEL TIMER
LINK->L2SLOTIM = T3; // SET FRAME SENT RECENTLY
LINK->LINKWINDOW = PORT->PORTWINDOW;
RESET2(LINK); // RESET ALL FLAGS
LINK->L2STATE = 5;
// IF VERSION 1 MSG, SET FLAG
if (MSGFLAG & VER1)
LINK->VER1FLAG |= 1;
}
VOID L2SENDUA(struct PORTCONTROL * PORT, MESSAGE * Buffer, MESSAGE * ADJBUFFER)
{
L2SENDRESP(PORT, Buffer, ADJBUFFER, UA);
}
VOID L2SENDDM(struct PORTCONTROL * PORT, MESSAGE * Buffer, MESSAGE * ADJBUFFER)
{
if (CheckExcludeList(Buffer->ORIGIN) == 0) // if in exclude, don't send DM
{
ReleaseBuffer(Buffer); // not sure that this is the right place for releasing?
return;
}
L2SENDRESP(PORT, Buffer, ADJBUFFER, DM);
}
VOID L2SENDRESP(struct PORTCONTROL * PORT, MESSAGE * Buffer, MESSAGE * ADJBUFFER, UCHAR CTL)
{
// QUEUE RESPONSE TO PORT CONTROL - MAY NOT HAVE A LINK ENTRY
// SET APPROPRIATE P/F BIT
ADJBUFFER->CTL = CTL | PFBIT;
Buffer->LENGTH = (int)((UCHAR *)ADJBUFFER - (UCHAR *)Buffer) + MSGHDDRLEN + 15; // SET UP BYTE COUNT
L2SWAPADDRESSES(Buffer); // SWAP ADDRESSES AND SET RESP BITS
PUT_ON_PORT_Q(PORT, Buffer);
return;
}
VOID L2SENDINVALIDCTRL(struct PORTCONTROL * PORT, MESSAGE * Buffer, MESSAGE * ADJBUFFER, UCHAR CTL)
{
// Send FRMR Invalid Control field
// QUEUE RESPONSE TO PORT CONTROL - MAY NOT HAVE A LINK ENTRY
// SET APPROPRIATE P/F BIT
UCHAR * ptr;
ADJBUFFER->CTL = FRMR | PFBIT;
ptr = &ADJBUFFER->PID;
*(ptr++) = CTL; // MOVE REJECT C-BYTE
*(ptr++) = 0;
*(ptr++) = SDINVC; // MOVE REJECT FLAGS
Buffer->LENGTH = (int)((UCHAR *)ADJBUFFER - (UCHAR *)Buffer) + MSGHDDRLEN + 18; // SET UP BYTE COUNT
L2SWAPADDRESSES(Buffer); // SWAP ADDRESSES AND SET RESP BITS
PUT_ON_PORT_Q(PORT, Buffer);
return;
}
VOID L2SWAPADDRESSES(MESSAGE * Buffer)
{
// EXCHANGE ORIGIN AND DEST, AND REVERSE DIGIS (IF PRESENT)
char TEMPFIELD[7];
UCHAR * ptr1, * ptr2;
UCHAR TEMPDIGI[57];
memcpy(TEMPFIELD, Buffer->ORIGIN, 7);
memcpy(Buffer->ORIGIN, Buffer->DEST, 7);
memcpy(Buffer->DEST, TEMPFIELD, 7);
Buffer->ORIGIN[6] &= 0x1e; // Mask SSID
Buffer->ORIGIN[6] |= 0xe0; // Reserved and Response
Buffer->DEST[6] &= 0x1e; // Mask SSID
Buffer->DEST[6] |= 0x60; // Reserved
if ((TEMPFIELD[6] & 1) == 0)
{
// THERE ARE DIGIS TO PROCESS - COPY TO WORK AREA reversed, THEN COPY BACK
memset(TEMPDIGI, 0, 57); // CLEAR DIGI FIELD IN CASE RECONNECT
ptr1 = &Buffer->ORIGIN[6]; // End of add
ptr2 = &TEMPDIGI[7 * 7]; // Last Temp Digi
while((*ptr1 & 1) == 0) // End of address bit
{
ptr1++;
memcpy(ptr2, ptr1, 7);
ptr2[6] &= 0x1e; // Mask Repeated and Last bits
ptr2 -= 7;
ptr1 += 6;
}
// LIST OF DIGI CALLS COMPLETE - copy back
ptr1 = ptr2 + 7; // First in TEMPDIGIS
ptr2 = &Buffer->CTL;
while (*ptr1)
{
memcpy(ptr2, ptr1, 7);
ptr1 += 7;
ptr2 += 7;
}
*(ptr2 - 1) |= 1; // End of addresses
}
else
{
Buffer->ORIGIN[6] |= 1; // End of address
}
}
BOOL InternalL2SETUPCROSSLINK(PROUTE ROUTE, int Retries)
{
// ROUTE POINTS TO A NEIGHBOUR - FIND AN L2 SESSION FROM US TO IT, OR INITIATE A NEW ONE
struct _LINKTABLE * LINK;
struct PORTCONTROL * PORT;
int FRACK;
if (FindLink(ROUTE->NEIGHBOUR_CALL, NETROMCALL, ROUTE->NEIGHBOUR_PORT, &LINK))
{
// SESSION ALREADY EXISTS
LINK->LINKTYPE = 3; // MAKE SURE IT KNOWS ITS A CROSSLINK
ROUTE->NEIGHBOUR_LINK = LINK;
LINK->NEIGHBOUR = ROUTE;
return TRUE;
}
// SET UP NEW SESSION (OR RESET EXISTING ONE)
if (LINK == NULL)
return FALSE; // No free links
ROUTE->NEIGHBOUR_LINK = LINK;
LINK->NEIGHBOUR = ROUTE;
LINK->LINKPORT = PORT = GetPortTableEntryFromPortNum(ROUTE->NEIGHBOUR_PORT);
if (PORT == NULL)
return FALSE; // maybe port has been deleted
// IF ROUTE HAS A FRACK, SET IT
if (ROUTE->NBOUR_FRACK)
FRACK = ROUTE->NBOUR_FRACK;
else
FRACK = PORT->PORTT1;
LINK->L2TIME = FRACK; // SET TIMER VALUE
// IF ROUTE HAS A WINDOW, SET IT
if (ROUTE->NBOUR_MAXFRAME)
LINK->LINKWINDOW = ROUTE->NBOUR_MAXFRAME;
else
LINK->LINKWINDOW = PORT->PORTWINDOW;
// if (SUPPORT2point2)
// LINK->L2STATE = 1; // Send XID
// else
LINK->L2STATE = 2;
memcpy(LINK->LINKCALL, ROUTE->NEIGHBOUR_CALL, 7);
memcpy(LINK->OURCALL, NETROMCALL, 7);
if (ROUTE->NEIGHBOUR_DIGI1[0])
{
memcpy(LINK->DIGIS, ROUTE->NEIGHBOUR_DIGI1, 7);
LINK->L2TIME += FRACK;
}
if (ROUTE->NEIGHBOUR_DIGI2[0])
{
memcpy(&LINK->DIGIS[7], ROUTE->NEIGHBOUR_DIGI1, 7);
LINK->L2TIME += FRACK;
}
LINK->LINKTYPE = 3; // CROSSLINK
if (Retries)
LINK->L2RETRIES = PORT->PORTN2 - Retries;
if (LINK->L2STATE == 1)
L2SENDXID(LINK);
else
SENDSABM(LINK);
return TRUE;
}
BOOL L2SETUPCROSSLINKEX(PROUTE ROUTE, int Retries)
{
// Allows caller to specify number of times SABM should be sent
return InternalL2SETUPCROSSLINK(ROUTE, Retries);
}
BOOL L2SETUPCROSSLINK(PROUTE ROUTE)
{
return InternalL2SETUPCROSSLINK(ROUTE, 0);
}
VOID L2_PROCESS(struct _LINKTABLE * LINK, struct PORTCONTROL * PORT, MESSAGE * Buffer, UCHAR CTL, UCHAR MSGFLAG)
{
// PROCESS LEVEL 2 PROTOCOL STUFF
// SEE IF COMMAND OR RESPONSE
if ((MSGFLAG & CMDBIT) == 0)
{
// RESPONSE OR VERSION 1
// IF RETRYING, MUST ONLY ACCEPT RESPONSES WITH F SET (UNLESS RUNNING V1)
if ((CTL & PFBIT) || LINK->VER1FLAG == 1)
{
// F SET or V1 - CAN CANCEL TIMER
LINK->L2TIMER = 0; // CANCEL LINK TIMER
}
}
if (LINK->L2STATE == 3)
{
// FRMR STATE - IF C(P) SEND FRMR, ELSE IGNORE
if (CTL & PFBIT)
{
if (CTL == (FRMR | PFBIT)) // if both ends in FRMR state, reset link
{
RESET2(LINK);
LINK->L2STATE = 2; // INITIALISING
LINK->L2ACKREQ = 0; // DONT SEND ANYTHING ELSE
LINK->L2RETRIES = 0; // ALLOW FULL RETRY COUNT FOR SABM
L2SENDCOMMAND(LINK, SABM | PFBIT);
}
}
if (MSGFLAG & CMDBIT)
{
// SEND FRMR AGAIN
SENDFRMR(LINK);
}
ReleaseBuffer(Buffer);
return;
}
if (LINK->L2STATE >= 5)
{
// LINK IN STATE 5 OR ABOVE - LINK RUNNING
if ((CTL & 1) == 0) // I frame
{
SDIFRM(LINK, PORT, Buffer, CTL, MSGFLAG); // consumes buffer
return;
}
if ((CTL & 2)) // U frame
{
SDUFRM(LINK, PORT, Buffer, CTL); //consumes buffer
return;
}
// ELSE SUPERVISORY, MASK OFF N(R) AND P-BIT
switch (CTL & 0x0f)
{
// is there any harm in accepting SREJ even if we don't
// otherwise support 2.2?
case REJ:
case SREJ:
PORT->L2REJCOUNT++;
case RR:
case RNR:
SFRAME(LINK, PORT, CTL, MSGFLAG);
break;
default:
// UNRECOGNISABLE COMMAND
LINK->SDRBYTE = CTL; // SAVE FOR FRMR RESPONSE
LINK->SDREJF |= SDINVC; // SET INVALID COMMAND REJECT
SDFRMR(LINK, PORT); // PROCESS FRAME REJECT CONDITION
}
ReleaseBuffer(Buffer);
return;
}
// NORMAL DISCONNECT MODE
// COULD BE UA, DM - SABM AND DISC HANDLED ABOVE
switch (CTL & ~PFBIT)
{
case UA:
// UA RECEIVED
if (LINK->L2STATE == 2)
{
// RESPONSE TO SABM - SET LINK UP
RESET2X(LINK); // LEAVE QUEUED STUFF
LINK->L2STATE = 5;
LINK->L2TIMER = 0; // CANCEL TIMER
LINK->L2RETRIES = 0;
LINK->L2SLOTIM, T3; // SET FRAME SENT RECENTLY
// IF VERSION 1 MSG, SET FLAG
if (MSGFLAG & VER1)
LINK->VER1FLAG |= 1;
// TELL PARTNER CONNECTION IS ESTABLISHED
if (PORT->TNC && PORT->TNC->Hardware == H_KISSHF)
KISSHFConnected(PORT, LINK);
SENDCONNECTREPLY(LINK);
ReleaseBuffer(Buffer);
return;
}
if (LINK->L2STATE == 4) // DISCONNECTING?
{
InformPartner(LINK, NORMALCLOSE); // SEND DISC TO OTHER END
CLEAROUTLINK(LINK);
if (PORT->TNC && PORT->TNC->Hardware == H_KISSHF)
DetachKISSHF(PORT);
}
// UA, BUT NOT IN STATE 2 OR 4 - IGNORE
ReleaseBuffer(Buffer);
return;
case DM:
// DM RESPONSE - IF TO SABM, SEND BUSY MSG
if (LINK->L2STATE == 2)
{
CONNECTREFUSED(LINK); // SEND MESSAGE IF DOWNLINK
return;
}
// DM RESP TO DISC RECEIVED - OTHER END HAS LOST SESSION
// CLEAR OUT TABLE ENTRY - IF INTERNAL TNC, SHOULD SEND *** DISCONNECTED
InformPartner(LINK, LINKLOST); // SEND DISC TO OTHER END
CLEAROUTLINK(LINK);
if (PORT->TNC && PORT->TNC->Hardware == H_KISSHF)
DetachKISSHF(PORT);
ReleaseBuffer(Buffer);
return;
case FRMR:
// FRAME REJECT RECEIVED - LOG IT AND RESET LINK
RESET2(LINK);
LINK->L2STATE = 2; // INITIALISING
LINK->L2ACKREQ = 0; // DONT SEND ANYTHING ELSE
LINK->L2RETRIES = 0; // ALLOW FULL RETRY COUNT FOR SABM
PORT->L2FRMRRX++;
L2SENDCOMMAND(LINK, SABM | PFBIT);
return;
default:
// ANY OTHER - IGNORE
ReleaseBuffer(Buffer);
}
}
VOID SDUFRM(struct _LINKTABLE * LINK, struct PORTCONTROL * PORT, MESSAGE * Buffer, UCHAR CTL)
{
// PROCESS AN UNSEQUENCED COMMAND (IN LINK UP STATES)
switch (CTL & ~PFBIT)
{
case UA:
// DISCARD - PROBABLY REPEAT OF ACK OF SABM
break;
case FRMR:
// FRAME REJECT RECEIVED - LOG IT AND RESET LINK
RESET2(LINK);
LINK->L2STATE = 2; // INITIALISING
LINK->L2ACKREQ = 0; // DONT SEND ANYTHING ELSE
LINK->L2RETRIES = 0; // ALLOW FULL RETRY COUNT FOR SABM
PORT->L2FRMRRX++;
L2SENDCOMMAND(LINK, SABM | PFBIT);
break;
case DM:
// DM RESPONSE - SESSION MUST HAVE GONE
// SEE IF CROSSLINK ACTIVE
InformPartner(LINK, LINKLOST); // SEND DISC TO OTHER END
CLEAROUTLINK(LINK);
if (PORT->TNC && PORT->TNC->Hardware == H_KISSHF)
DetachKISSHF(PORT);
break;
default:
// UNDEFINED COMMAND
LINK->SDRBYTE = CTL; // SAVE FOR FRMR RESPONSE
LINK->SDREJF |= SDINVC;
SDFRMR(LINK, PORT); // PROCESS FRAME REJECT CONDITION
}
ReleaseBuffer(Buffer);
}
VOID SFRAME(struct _LINKTABLE * LINK, struct PORTCONTROL * PORT, UCHAR CTL, UCHAR MSGFLAG)
{
// CHECK COUNTS, AND IF RNR INDICATE _BUFFER SHORTAGE AT OTHER END
if (LINK->SDREJF) // ARE ANY REJECT FLAGS SET?
{
SDFRMR(LINK, PORT); // PROCESS FRAME REJECT CONDITION
return;
}
SDNRCHK(LINK, CTL); // CHECK RECEIVED N(R)
if (LINK->SDREJF) // ARE ANY REJECT FLAGS SET NOW?
{
SDFRMR(LINK, PORT); // PROCESS FRAME REJECT CONDITION
return;
}
if ((CTL & 0xf) == SREJ)
{
// Probably safer to handle SREJ completely separately
// Can we get SREJ Command with P??(Yes)
// Can we just resend missing frame ?? (Think so!)
// We support MultiSREJ (can gave additional missing frame
// numbers in the Info field
// I don't see the point of Multi unless we wait fot an F bit,
// bur maybe not safe to assume others do the same
// So if I get SREJ(F) I can send missing frame(s)
if (MSGFLAG & RESP)
{
// SREJ Response
if (CTL & PFBIT)
{
// SREJ(F). Send Frames()
UCHAR NS = (CTL >> 5) & 7; // Frame to resend
struct PORTCONTROL * PORT;
UCHAR * ptr1, * ptr2;
UCHAR CTL;
int count;
MESSAGE * Msg;
MESSAGE * Buffer;
Msg = LINK->FRAMES[NS]; // is frame available?
if (Msg == NULL)
return; // Wot!!
// send the frame
// GET BUFFER FOR COPY OF MESSAGE - HAVE TO KEEP ORIGINAL FOR RETRIES
Buffer = GetBuff();
if (Buffer == NULL)
return;
ptr2 = SETUPADDRESSES(LINK, Buffer); // copy addresses
// ptr2 NOW POINTS TO COMMAND BYTE
// GOING TO SEND I FRAME - WILL ACK ANY RECEIVED FRAMES
LINK->L2ACKREQ = 0; // CLEAR ACK NEEDED
LINK->L2SLOTIM = T3 + rand() % 15; // SET FRAME SENT RECENTLY
LINK->KILLTIMER = 0; // RESET IDLE CIRCUIT TIMER
CTL = LINK->LINKNR << 5; // GET CURRENT N(R), SHIFT IT TO TOP 3 BITS
CTL |= NS << 1; // BITS 1-3 OF CONTROL BYTE
// SET P BIT IF NO MORE TO SEND (only more if Multi SREJ)
if (LINK->VER1FLAG == 0) // NO POLL BIT IF V1
{
CTL |= PFBIT;
LINK->L2FLAGS |= POLLSENT;
LINK->L2TIMER = ONEMINUTE; // (RE)SET TIMER
// FLAG BUFFER TO CAUSE TIMER TO BE RESET AFTER SEND (or ACK if ACKMODE)
Buffer->Linkptr = LINK;
}
*(ptr2++) = CTL; // TO DATA (STARTING WITH PID)
count = Msg->LENGTH - MSGHDDRLEN;
if (count > 0) // SHOULD ALWAYS BE A PID, BUT BETTER SAFE THAN SORRY
{
ptr1 = (UCHAR *)Msg;
ptr1 += MSGHDDRLEN;
memcpy(ptr2, ptr1, count);
}
Buffer->DEST[6] |= 0x80; // SET COMMAND
Buffer->LENGTH = (int)(ptr2 - (UCHAR *)Buffer) + count; // SET NEW LENGTH
LINK->L2TIMER = ONEMINUTE; // (RE)SET TIMER
PORT = LINK->LINKPORT;
if (PORT)
{
Buffer->PORT = PORT->PORTNUMBER;
PUT_ON_PORT_Q(PORT, Buffer);
}
else
{
Buffer->Linkptr = 0;
ReleaseBuffer(Buffer);
}
}
}
return;
}
// VALID RR/RNR RECEIVED
LINK->L2FLAGS &= ~RNRSET; //CLEAR RNR
if ((CTL & 0xf) == RNR)
LINK->L2FLAGS |= RNRSET; //Set RNR
if (MSGFLAG & CMDBIT)
{
// ALWAYS REPLY TO RR/RNR/REJ COMMAND (even if no P bit ??)
// FIRST PROCESS RESEQ QUEUE
//; CALL PROCESS_RESEQ
// IGNORE IF AN 'F' HAS BEEN SENT RECENTLY
if (LINK->LAST_F_TIME + 15 > REALTIMETICKS)
return; // DISCARD
CTL = RR_OR_RNR(LINK);
CTL |= LINK->LINKNR << 5; // SHIFT N(R) TO TOP 3 BITS
CTL |= PFBIT;
L2SENDRESPONSE(LINK, CTL);
LINK->L2SLOTIM = T3 + rand() % 15; // SET FRAME SENT RECENTLY
LINK->L2ACKREQ = 0; // CANCEL DELAYED ACKL2
// SAVE TIME IF 'F' SENT'
LINK->LAST_F_TIME = REALTIMETICKS;
return;
}
// Response
if ((CTL & PFBIT) == 0 && LINK->VER1FLAG == 0)
{
// RESPONSE WITHOUT P/F DONT RESET N(S) (UNLESS V1)
return;
}
// RESPONSE WITH P/F - MUST BE REPLY TO POLL FOLLOWING TIMEOUT OR I(P)
// THERE IS A PROBLEM WITH REPEATED RR(F), SAY CAUSED BY DELAY AT L1
// AS FAR AS I CAN SEE, WE SHOULD ONLY RESET N(S) IF AN RR(F) FOLLOWS
// AN RR(P) AFTER A TIMEOUT - AN RR(F) FOLLOWING AN I(P) CANT POSSIBLY
// INDICATE A LOST FRAME. ON THE OTHER HAND, A REJ(F) MUST INDICATE
// A LOST FRAME. So dont reset NS if not retrying, unless REJ
// someone (probably WLE KISS Driver) is sending REJ followed by RR(F)
// after lost frame and i(p)
/*
1:Fm W4DHW-10 To W4DHW <I C P R1 S4 Pid=F0 Len=236> [17:08:03R] [+++]
<EFBFBD>J<EFBFBD><EFBFBD>ZK<EFBFBD>)x@D<>B<EFBFBD>rN<72><4E>4X<34>;i<>#C<>M<EFBFBD>,<2C>нҼ<D0BD><D2BC>r<EFBFBD><72>O<EFBFBD> N<>X<EFBFBD><58><EFBFBD><EFBFBD><EFBFBD>5<EFBFBD>(<28>|<7C><><EFBFBD>#<23><><EFBFBD>U<EFBFBD><55><EFBFBD>cY<63><59>l<EFBFBD><6C><EFBFBD><EFBFBD>)<29><>璘o<EFA7AF>ȼ<EFBFBD>><3E><>9<EFBFBD>*<2A>G<EFBFBD><47><EFBFBD><EFBFBD><EFBFBD>(6<>5C<35>!<21>L<EFBFBD><4C><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ُQ<D98F><51>p<EFBFBD><70>IH<49><48>;<3B><>i<EFBFBD><69><EFBFBD><EFBFBD>><3E>9p<39>B<EFBFBD><42><<3C>c<EFBFBD>EP<45><50><<3C><>{0a<30>(<28><>YՖ<59>M<EFBFBD><4D><EFBFBD>N<EFBFBD>+<<3C>I<EFBFBD>[<5B><><EFBFBD><EFBFBD>Pw<50>[^]6<>2\<5C><EFBFBD>9<EFBFBD><39>ov{<7B><><EFBFBD>Ÿmm<d<>^
1:Fm W4DHW To W4DHW-10 <RR C P R1> [17:08:03T]
1:Fm W4DHW To W4DHW-10 <REJ R R1> [17:08:03T]
1:Fm W4DHW To W4DHW-10 <RR R F R1> [17:08:03T]
is there a problem with restting on RR(F) following I(P)?
I think the problem is restting NS twice if you get delayed responses to
I or RR (P). So lets try only resetting NS once for each P sent
*/
// if ((CTL & 0xf) == REJ || LINK->L2RETRIES)
if ((LINK->L2FLAGS & POLLSENT))
{
RESETNS(LINK, (CTL >> 5) & 7); // RESET N(S) AND COUNT RETRIED FRAMES
LINK->L2RETRIES = 0;
LINK->L2TIMER = 0; // WILL RESTART TIMER WHEN RETRY SENT
}
LINK->L2FLAGS &= ~POLLSENT; // CLEAR I(P) or RR(P) SET
if ((CTL & 0xf) == RNR)
{
// Dont Clear timer on receipt of RNR(F), spec says should poll for clearing of busy,
// and loss of subsequent RR will cause hang. Perhaps should set slightly longer time??
// Timer may have been cleared earlier, so restart it
LINK->L2TIMER = LINK->L2TIME;
}
}
//*** PROCESS AN INFORMATION FRAME
VOID SDIFRM(struct _LINKTABLE * LINK, struct PORTCONTROL * PORT, MESSAGE * Buffer, UCHAR CTL, UCHAR MSGFLAG)
{
int NS;
if (LINK->SDREJF) // ARE ANY REJECT FLAGS SET?
{
SDFRMR(LINK, PORT); // PROCESS FRAME REJECT CONDITION
ReleaseBuffer(Buffer);
return;
}
SDNRCHK(LINK, CTL); // CHECK RECEIVED N(R)
if (LINK->SDREJF) // ARE ANY REJECT FLAGS SET NOW?
{
SDFRMR(LINK, PORT); // PROCESS FRAME REJECT CONDITION
ReleaseBuffer(Buffer);
return;
}
LINK->SESSACTIVE = 1; // SESSION IS DEFINITELY SET UP
NS = (CTL >> 1) & 7; // ISOLATE RECEIVED N(S)
// IPOLL (sending an I(P) frame following timeout instead of RR(P))
// is a problem. We need to send REJ(F), but shouldn't add to collector.
// We also need to handle repeated I(P), so shouldn't set REJSENT in
// this state.
if ((((NS + 1) & 7) == LINK->LINKNR) && (CTL & PFBIT))
{
// Previous Frame and P set - Assume IPOLL
PORT->L2OUTOFSEQ++;
LINK->L2STATE = 6;
LINK->L2ACKREQ = 0; // CANCEL RR NEEDED
// We need to protect against sending multiple REJ(F) if channel
// delays mean we get two I(P) close together (how close is close ??)
// SM has default IPOLL limit of 30 bytes or about a second at 300
// ACKMODE should avoid this anyway, and resptime of under 3 secs
// is unlikely so say 2.5 secs ??
if (LINK->LAST_F_TIME + 25 > REALTIMETICKS)
{
ReleaseBuffer(Buffer);
return;
}
SEND_RR_RESP(LINK, PFBIT);
LINK->LAST_F_TIME = REALTIMETICKS;
ReleaseBuffer(Buffer);
return;
}
CheckNSLoop:
if (NS != LINK->LINKNR) // EQUAL TO OUR N(R)?
{
// There is a frame missing.
// if we have just sent a REJ we have at least one out
// of sequence frame in RXFRAMES
// so if we have frame LINK->LINKNR we can process it
// and remove it from RXFRAMES. If we are then back
// in sequence we just carry on.
if (LINK->RXFRAMES[LINK->LINKNR])
{
// We have the first missing frame. Process it.
MESSAGE * OldBuffer = Q_REM(&LINK->RXFRAMES[LINK->LINKNR]);
Debugprintf("L2 process saved Frame %d", LINK->LINKNR);
PROC_I_FRAME(LINK, PORT, OldBuffer); // Passes on or releases Buffer
// NR has been updated.
goto CheckNSLoop; // See if OK or we have another saved frame
}
// BAD FRAME, SEND REJ (AFTER RESPTIME - OR WE MAY SEND LOTS!)
// ALSO SAVE THE FRAME - NEXT TIME WE MAY GET A DIFFERENT SUBSET
// AND SOON WE WILL HANDLE SREJ
PORT->L2OUTOFSEQ++;
LINK->L2STATE = 6;
// IF RUNNING VER1, AND OTHER END MISSES THIS REJ, LINK WILL FAIL
// SO TIME OUT REJ SENT STATE (MUST KEEP IT FOR A WHILE TO AVOID
// 'MULTIPLE REJ' PROBLEM)
if (LINK->VER1FLAG == 1)
LINK->REJTIMER = TENSECS;
// SET ACK REQUIRED TIMER - REJ WILL BE SENT WHEN IT EXPIRES
// if configured RESPTIME is longer than 3 secs use it (may be longer on HF)
if (PORT->PORTT2 > THREESECS)
LINK->L2ACKREQ = PORT->PORTT2;
else
LINK->L2ACKREQ = THREESECS; // EXTRA LONG RESPTIME, AS SENDING TOO MANY REJ'S IS SERIOUS
if (LINK->RXFRAMES[NS])
{
// Already have a copy, so discard old and keep this
Debugprintf ("Frame %d out of seq but already have copy - release it", NS);
ReleaseBuffer(Q_REM(&LINK->RXFRAMES[NS]));
}
else
{
Debugprintf ("Frame %d out of seq - save", NS);
}
Buffer->CHAIN = 0;
LINK->RXFRAMES[NS] = Buffer;
goto CheckPF;
}
// IN SEQUENCE FRAME
// Remove any stored frame with this seq
if (LINK->RXFRAMES[NS])
ReleaseBuffer(Q_REM(&LINK->RXFRAMES[NS]));
if (LINK->L2STATE == 6) // REJ?
{
// If using REJ we can cancel REJ state.
// If using SREJ we only cancel REJ if we have no stored frames
if (LINK->Ver2point2)
{
// see if any frames saved.
int i;
for (i = 0; i < 8; i++)
{
if (LINK->RXFRAMES[i])
goto stayinREJ;
}
// Drop through if no stored frames
}
// CANCEL REJ
LINK->L2STATE = 5;
LINK->L2FLAGS &= ~REJSENT;
}
stayinREJ:
PROC_I_FRAME(LINK, PORT, Buffer); // Passes on or releases Buffer
CheckPF:
if (LINK->Ver2point2 == 0) // Unless using SREJ
{
if (LINK->L2FLAGS & REJSENT)
{
return; // DONT SEND ANOTHER TILL REJ IS CANCELLED
}
}
if (CTL & PFBIT)
{
if (LINK->L2STATE == 6)
LINK->L2FLAGS |= REJSENT; // Set "REJ Sent"
else
{
// we have all frames. Clear anything in RXFRAMES
int n = 0;
while (n < 8)
{
if (LINK->RXFRAMES[n])
ReleaseBuffer(Q_REM(&LINK->RXFRAMES[n]));
n++;
}
}
LINK->L2ACKREQ = 0; // CANCEL RR NEEDED
SEND_RR_RESP(LINK, PFBIT);
// RECORD TIME
LINK->LAST_F_TIME = REALTIMETICKS;
}
else
if (LINK->L2ACKREQ == 0) // Resptime is zero so send RR now
SEND_RR_RESP(LINK, 0);
}
VOID PROC_I_FRAME(struct _LINKTABLE * LINK, struct PORTCONTROL * PORT, MESSAGE * Buffer)
{
int Length;
char * Info;
UCHAR PID;
struct DATAMESSAGE * Msg = (struct DATAMESSAGE *)Buffer;
UCHAR * EOA;
int n = 8; // Max Digis
LINK->LINKNR++; // INCREMENT OUR N(R)
LINK->LINKNR &= 7; // MODULO 8
// ATTACH I FRAMES TO LINK TABLE RX QUEUE - ONLY DATA IS ADDED (NOT ADDRESSES)
// IF DISC PENDING SET, IGNORE FRAME
if (LINK->L2FLAGS & DISCPENDING)
{
ReleaseBuffer(Buffer);
return;
}
// Copy data down the buffer so PID comes after Header (DATAMESSAGE format)
Length = Buffer->LENGTH - (MSGHDDRLEN + 15); // Buffer Header + addrs + CTL
Info = &Buffer->PID;
LINK->bytesRXed += Length;
// Adjust for DIGIS
EOA = &Buffer->ORIGIN[6]; // End of address Bit
while (((*EOA & 1) == 0) && n--)
{
Length -= 7;
Info += 7;
EOA += 7;
}
PID = EOA[2];
switch(PID)
{
case 0xcc:
case 0xcd:
// IP Message
if (n < 8) // If digis, move data back down buffer
{
memmove(&Buffer->PID, &EOA[2], Length);
Buffer->LENGTH -= (int)(&EOA[2] - &Buffer->PID);
}
Q_IP_MSG( Buffer);
break;
case 8:
// NOS FRAGMENTED IP
if (n < 8) // If digis, move data back down buffer
{
memmove(&Buffer->PID, &EOA[2], Length);
Buffer->LENGTH -= (int)(&EOA[2] - &Buffer->PID);
}
C_Q_ADD(&LINK->L2FRAG_Q, Buffer);
if (Buffer->L2DATA[0] == 0)
{
// THERE IS A WHOLE MESSAGE ON FRAG_Q - PASS TO IP
while(LINK->L2FRAG_Q)
{
Buffer = Q_REM(&LINK->L2FRAG_Q);
Q_IP_MSG( Buffer);
}
}
break;
default:
if (Length < 1 || Length > 257)
{
ReleaseBuffer(Buffer);
return;
}
// Copy Data back over
memmove(&Msg->PID, Info, Length);
Buffer->LENGTH = Length + MSGHDDRLEN;
C_Q_ADD(&LINK->RX_Q, Buffer);
}
LINK->L2ACKREQ = PORT->PORTT2; // SET RR NEEDED
LINK->KILLTIMER = 0; // RESET IDLE LINK TIMER
}
//*** CHECK RECEIVED N(R) COUNT
VOID SDNRCHK(struct _LINKTABLE * LINK, UCHAR CTL)
{
UCHAR NR = (CTL >> 5) & 7;
if (NR >= LINK->LINKWS) // N(R) >= WINDOW START?
{
// N(R) ABOVE OR EQUAL TO WINDOW START - OK IF NOT ABOVE N(S), OR N(S) BELOW WS
if (NR > LINK->LINKNS) // N(R) <= WINDOW END?
{
// N(R) ABOVE N(S) - DOES COUNT WRAP?
if (LINK->LINKNS >= LINK->LINKWS) // Doesnt wrap
goto BadNR;
}
GoodNR:
if ((CTL & 0x0f) == SREJ)
if ((CTL & PFBIT) == 0)
return; // SREJ without F doesn't ACK anything
LINK->LINKWS = NR; // NEW WINDOW START = RECEIVED N(R)
ACKMSG(LINK); // Remove any acked messages
return;
}
// N(R) LESS THAN WINDOW START - ONLY OK IF WINDOW WRAPS
if (NR <= LINK->LINKNS) // N(R) <= WINDOW END?
goto GoodNR;
BadNR:
// RECEIVED N(R) IS INVALID
LINK->SDREJF |= SDNRER; // FLAG A REJECT CONDITION
LINK->SDRBYTE = CTL; // SAVE FOR FRMR RESPONSE
}
VOID RESETNS(struct _LINKTABLE * LINK, UCHAR NS)
{
int Resent = (LINK->LINKNS - NS) & 7; // FRAMES TO RESEND
LINK->LINKNS = NS; // RESET N(S)
if (LINK->LINKTYPE == 3) // mode-Node
{
if (LINK->NEIGHBOUR)
LINK->NEIGHBOUR->NBOUR_RETRIES += Resent;
}
}
int COUNT_AT_L2(struct _LINKTABLE * LINK)
{
// COUNTS FRAMES QUEUED ON AN L2 SESSION (IN BX)
int count = 0, abovelink = 0;
int n = 0;
if (LINK == NULL)
return 0;
abovelink = C_Q_COUNT((UINT *)&LINK->TX_Q);
// COUNT FRAMES IN TSLOTS
while (n < 8)
{
if (LINK->FRAMES[n])
count++;
n++;
}
// ADD AL,AH ; TOTAL IN AL, NUMBER ABOVE LINK IN AH
return abovelink + count;
}
//*** RESET HDLC AND PURGE ALL QUEUES ETC.
VOID RESET2X(struct _LINKTABLE * LINK)
{
LINK->SDREJF = 0; // CLEAR FRAME REJECT FLAGS
LINK->LINKWS = 0; // CLEAR WINDOW POINTERS
LINK->LINKOWS = 0;
LINK->LINKNR = 0; // CLEAR N(R)
LINK->LINKNS = 0; // CLEAR N(S)
LINK->SDTSLOT= 0;
LINK->L2STATE = 5; // RESET STATE
LINK->L2FLAGS = 0;
}
VOID CLEARL2QUEUES(struct _LINKTABLE * LINK)
{
// GET RID OF ALL FRAMES THAT ARE QUEUED
int n = 0;
while (n < 8)
{
while (LINK->FRAMES[n])
ReleaseBuffer(Q_REM(&LINK->FRAMES[n]));
while (LINK->RXFRAMES[n])
ReleaseBuffer(Q_REM(&LINK->RXFRAMES[n]));
n++;
}
// GET RID OF ALL FRAMES THAT ARE
// QUEUED ON THE TX HOLDING QUEUE, RX QUEUE AND LEVEL 3 QUEUE
while (LINK->TX_Q)
ReleaseBuffer(Q_REM(&LINK->TX_Q));
while (LINK->RX_Q)
ReleaseBuffer(Q_REM(&LINK->RX_Q));
}
VOID RESET2(struct _LINKTABLE * LINK)
{
CLEARL2QUEUES(LINK);
RESET2X(LINK);
}
VOID SENDSABM(struct _LINKTABLE * LINK)
{
char toCall[10];
char fromCall[10];
toCall[ConvFromAX25(LINK->LINKCALL, toCall)] = 0;
fromCall[ConvFromAX25(LINK->OURCALL, fromCall)] = 0;
hookL2SessionAttempt(LINK->LINKPORT->PORTNUMBER, fromCall, toCall, LINK);
L2SENDCOMMAND(LINK, SABM | PFBIT);
}
VOID PUT_ON_PORT_Q(struct PORTCONTROL * PORT, MESSAGE * Buffer)
{
// TIME STAMP IT
time(&Buffer->Timestamp);
if (PORT->TXPORT)
{
Buffer->PORT = PORT->TXPORT; // update port no in header
PORT = GetPortTableEntryFromPortNum(PORT->TXPORT);
if (PORT == NULL)
{
ReleaseBuffer(Buffer);
return;
}
}
C_Q_ADD(&PORT->PORTTX_Q, (UINT *)Buffer);
}
UCHAR * SETUPADDRESSES(struct _LINKTABLE * LINK, PMESSAGE Msg)
{
// COPY ADDRESSES FROM LINK TABLE TO MESSAGE _BUFFER
UCHAR * ptr1 = &LINK->DIGIS[0];
UCHAR * ptr2 = &Msg->CTL;
int Digis = 8;
memcpy(&Msg->DEST[0], &LINK->LINKCALL[0], 14); // COPY DEST AND ORIGIN
Msg->DEST[6] |= 0x60;
Msg->ORIGIN[6] |= 0x60;
while (Digis)
{
if (*(ptr1)) // any more to copy?
{
memcpy(ptr2, ptr1, 7);
ptr1 += 7;
ptr2 += 7;
Digis--;
}
else
break;
}
*(ptr2 - 1) |= 1; // SET END OF ADDRESSES
return ptr2; // Pointer to CTL
}
VOID SDETX(struct _LINKTABLE * LINK)
{
// Start sending frsmes if possible
struct PORTCONTROL * PORT;
int Outstanding;
UCHAR * ptr1, * ptr2;
UCHAR CTL;
int count;
MESSAGE * Msg;
MESSAGE * Buffer;
// DONT SEND IF RESEQUENCING RECEIVED FRAMES - CAN CAUSE FRMR PROBLEMS
// if (LINK->L2RESEQ_Q)
// return;
if (LINK->LINKPORT->PORTNUMBER == 19)
{
int i = 0;
}
Outstanding = LINK->LINKNS - LINK->LINKOWS; // Was WS not NS
if (Outstanding < 0)
Outstanding += 8; // allow for wrap
if (Outstanding >= LINK->LINKWINDOW) // LIMIT
return;
// See if we can load any more frames into the frame holding q
while (LINK->TX_Q && LINK->FRAMES[LINK->SDTSLOT] == NULL)
{
Msg = Q_REM(&LINK->TX_Q);
Msg->CHAIN = NULL;
LINK->FRAMES[LINK->SDTSLOT] = Msg;
LINK->SDTSLOT ++;
LINK->SDTSLOT &= 7;
}
// dont send while poll outstanding
while ((LINK->L2FLAGS & POLLSENT) == 0)
{
Msg = LINK->FRAMES[LINK->LINKNS]; // is next frame available?
if (Msg == NULL)
return;
// send the frame
// GET BUFFER FOR COPY OF MESSAGE - HAVE TO KEEP ORIGINAL FOR RETRIES
Buffer = GetBuff();
if (Buffer == NULL)
return;
ptr2 = SETUPADDRESSES(LINK, Buffer); // copy addresses
// ptr2 NOW POINTS TO COMMAND BYTE
// GOING TO SEND I FRAME - WILL ACK ANY RECEIVED FRAMES
LINK->L2ACKREQ = 0; // CLEAR ACK NEEDED
LINK->L2SLOTIM = T3 + rand() % 15; // SET FRAME SENT RECENTLY
LINK->KILLTIMER = 0; // RESET IDLE CIRCUIT TIMER
CTL = LINK->LINKNR << 5; // GET CURRENT N(R), SHIFT IT TO TOP 3 BITS
CTL |= LINK->LINKNS << 1; // BITS 1-3 OF CONTROL BYTE
LINK->LINKNS++; // INCREMENT NS
LINK->LINKNS &= 7; // mod 8
// SET P BIT IF END OF WINDOW OR NO MORE TO SEND
if (LINK->VER1FLAG == 0) // NO POLL BIT IF V1
{
Outstanding = LINK->LINKNS - LINK->LINKOWS;
if (Outstanding < 0)
Outstanding += 8; // allow for wrap
// if at limit, or no more to send, set P)
if (Outstanding >= LINK->LINKWINDOW || LINK->FRAMES[LINK->LINKNS] == NULL)
{
CTL |= PFBIT;
LINK->L2FLAGS |= POLLSENT;
LINK->L2TIMER = ONEMINUTE; // (RE)SET TIMER
// FLAG BUFFER TO CAUSE TIMER TO BE RESET AFTER SEND (or ACK if ACKMODE)
Buffer->Linkptr = LINK;
}
}
*(ptr2++) = CTL; // TO DATA (STARTING WITH PID)
count = Msg->LENGTH - MSGHDDRLEN;
if (count > 0) // SHOULD ALWAYS BE A PID, BUT BETTER SAFE THAN SORRY
{
ptr1 = (UCHAR *)Msg;
ptr1 += MSGHDDRLEN;
memcpy(ptr2, ptr1, count);
}
Buffer->DEST[6] |= 0x80; // SET COMMAND
Buffer->LENGTH = (int)(ptr2 - (UCHAR *)Buffer) + count; // SET NEW LENGTH
LINK->L2TIMER = ONEMINUTE; // (RE)SET TIMER
PORT = LINK->LINKPORT;
if (PORT)
{
Buffer->PORT = PORT->PORTNUMBER;
PUT_ON_PORT_Q(PORT, Buffer);
}
else
{
Buffer->Linkptr = 0;
ReleaseBuffer(Buffer);
}
}
}
VOID L2TimerProc()
{
int i = MAXLINKS;
struct _LINKTABLE * LINK = LINKS;
struct PORTCONTROL * PORT = PORTTABLE;
while (i--)
{
if (LINK->LINKCALL[0] == 0)
{
LINK++;
continue;
}
// CHECK FOR TIMER EXPIRY OR BUSY CLEARED
PORT = LINK->LINKPORT;
if (PORT == NULL)
{
LINK++;
continue; // just ion case!!
}
if (LINK->L2TIMER)
{
LINK->L2TIMER--;
if (LINK->L2TIMER == 0)
{
L2TIMEOUT(LINK, PORT);
LINK++;
continue;
}
}
else
{
// TIMER NOT RUNNING - MAKE SURE STATE NOT BELOW 5 - IF
// IT IS, SOMETHING HAS GONE WRONG, AND LINK WILL HANG FOREVER
if (LINK->L2STATE < 5 && LINK->L2STATE != 2 && LINK->L2STATE != 1) // 2 = CONNECT - PROBABLY TO CQ
LINK->L2TIMER = 2; // ARBITRARY VALUE
}
// TEST FOR RNR SENT, AND NOT STILL BUSY
if (LINK->L2FLAGS & RNRSENT)
{
// Was busy
if (RR_OR_RNR(LINK) != RNR) // SEE IF STILL BUSY
{
// Not still busy - tell other end
// Just sending RR will hause a hang of RR is missed, and other end does not poll on Busy
// Try sending RR CP, so we will retry if not acked
LINK->L2ACKREQ = 0; // CLEAR ANY DELAYED ACK TIMER
if (LINK->L2RETRIES == 0) // IF RR(P) OUTSTANDING WILl REPORT ANYWAY
{
SendSupervisCmd(LINK);
LINK++;
continue;
}
}
}
else
{
// NOT BUSY
if (LINK->L2ACKREQ) // DELAYED ACK TIMER
{
if (LINK->L2RETRIES == 0) // DONT SEND RR RESPONSE WHILEST RR(P) OUTSTANDING
{
LINK->L2ACKREQ--;
if (LINK->L2ACKREQ == 0)
{
SEND_RR_RESP(LINK, 0); // NO F BIT
LINK++;
continue;
}
}
}
}
// CHECK FOR REJ TIMEOUT
if (LINK->REJTIMER)
{
LINK->REJTIMER--;
if (LINK->REJTIMER == 0) // {REJ HAS TIMED OUT (THIS MUST BE A VERSION 1 SESSION)
{
// CANCEL REJ STATE
if (LINK->L2STATE == 6) // REJ?
LINK->L2STATE = 5; // CLEAR REJ
}
}
// See if time for link validation poll
if (LINK->L2SLOTIM)
{
LINK->L2SLOTIM--;
if (LINK->L2SLOTIM == 0) // Time to poll
{
SendSupervisCmd(LINK);
LINK++;
continue;
}
}
// See if idle too long
LINK->KILLTIMER++;
if (L2KILLTIME && LINK->KILLTIMER > L2KILLTIME)
{
// CIRCUIT HAS BEEN IDLE TOO LONG - SHUT IT DOWN
LINK->KILLTIMER = 0;
LINK->L2TIMER = 1; // TO FORCE DISC
LINK->L2STATE = 4; // DISCONNECTING
// TELL OTHER LEVELS
InformPartner(LINK, NORMALCLOSE);
}
LINK++;
}
}
VOID SendSupervisCmd(struct _LINKTABLE * LINK)
{
// Send Super Command RR/RNR/REJ(P)
UCHAR CTL;
if (LINK->VER1FLAG == 1)
{
// VERSION 1 TIMEOUT
// RESET TO RESEND I FRAMES
LINK->LINKNS = LINK->LINKOWS;
SDETX(LINK); // PREVENT FRMR (I HOPE)
}
// SEND RR COMMAND - EITHER AS LINK VALIDATION POLL OR FOLLOWING TIMEOUT
LINK->L2ACKREQ = 0; // CLEAR ACK NEEDED
CTL = RR_OR_RNR(LINK);
// MOV L2STATE[EBX],5 ; CANCEL REJ - ACTUALLY GOING TO 'PENDING ACK'
CTL |= LINK->LINKNR << 5; // SHIFT N(R) TO TOP 3 BITS
CTL |= PFBIT;
LINK->L2FLAGS |= POLLSENT;
L2SENDCOMMAND(LINK, CTL);
LINK->L2SLOTIM = T3 + rand() % 15; // SET FRAME SENT RECENTLY
}
void SEND_RR_RESP(struct _LINKTABLE * LINK, UCHAR PF)
{
UCHAR CTL;
CTL = RR_OR_RNR(LINK);
// MOV L2STATE[EBX],5 ; CANCEL REJ - ACTUALLY GOING TO 'PENDING ACK'
CTL |= LINK->LINKNR << 5; // SHIFT N(R) TO TOP 3 BITS
CTL |= PF;
L2SENDRESPONSE(LINK, CTL);
ACKMSG(LINK); // SEE IF STILL WAITING FOR ACK
}
VOID ACKMSG(struct _LINKTABLE * LINK)
{
// RELEASE ANY ACKNOWLEDGED FRAMES
while (LINK->LINKOWS != LINK->LINKWS) // is OLD WINDOW START EQUAL TO NEW WINDOW START?
{
// No, so frames to ack
if (LINK->FRAMES[LINK->LINKOWS])
ReleaseBuffer(Q_REM(&LINK->FRAMES[LINK->LINKOWS]));
else
{
char Call1[12], Call2[12];
Call1[ConvFromAX25(LINK->LINKCALL, Call1)] = 0;
Call2[ConvFromAX25(LINK->OURCALL, Call2)] = 0;
Debugprintf("Missing frame to ack Seq %d Calls %s %s", LINK->LINKOWS, Call1, Call2);
}
LINK->IFrameRetryCounter = 0;
LINK->LINKOWS++; // INCREMENT OLD WINDOW START
LINK->LINKOWS &= 7; // MODULO 8
// SOMETHING HAS BEEN ACKED - RESET RETRY COUNTER
if (LINK->L2RETRIES)
LINK->L2RETRIES = 1; // MUSTN'T SET TO ZERO - COULD CAUSE PREMATURE RETRANSMIT
}
if (LINK->LINKWS != LINK->LINKNS) // IS N(S) = NEW WINDOW START?
{
// NOT ALL I-FRAMES HAVE BEEN ACK'ED - RESTART TIMER
// Need to kill link if we are getting repeated RR(F) after timeout
// (Indicating other station is seeing our RR(P) but not the resent I frame)
if (LINK->IFrameRetryCounter++ > LINK->LINKPORT->PORTN2)
{
Debugprintf("Too many repeats of same I frame - closing connection");
LINK->L2TIMER = 1; // USE TIMER TO SEND DISC
LINK->L2STATE = 4; // DISCONNECTING
return;
}
LINK->L2TIMER = LINK->L2TIME;
return;
}
// ALL FRAMES HAVE BEEN ACKED - CANCEL TIMER UNLESS RETRYING
// IF RETRYING, MUST ONLY CANCEL WHEN RR(F) RECEIVED
if (LINK->VER1FLAG == 1 || LINK->L2RETRIES == 0) // STOP TIMER IF LEVEL 1 or not retrying
{
LINK->L2TIMER = 0;
LINK->L2FLAGS &= ~POLLSENT; // CLEAR I(P) SET (IN CASE TALKING TO OLD BPQ!)
}
// IF DISCONNECT REQUEST OUTSTANDING, AND NO FRAMES ON TX QUEUE, SEND DISC
if ((LINK->L2FLAGS & DISCPENDING) && LINK->TX_Q == 0)
{
LINK->L2FLAGS &= ~DISCPENDING;
LINK->L2TIMER = 1; // USE TIMER TO SEND DISC
LINK->L2STATE = 4; // DISCONNECTING
}
}
VOID CONNECTFAILED(struct _LINKTABLE * LINK);
VOID L2TIMEOUT(struct _LINKTABLE * LINK, struct PORTCONTROL * PORT)
{
// TIMER EXPIRED
// IF LINK UP (STATE 5 OR ABOVE) SEND RR/RNR AS REQUIRED
// IF S2, REPEAT SABM
// IF S3, REPEAT FRMR
// IF S4, REPEAT DISC
PORT->L2TIMEOUTS++; // FOR STATS
if (LINK->L2STATE == 0)
return;
if (LINK->L2STATE == 1)
{
// XID
LINK->L2RETRIES++;
if (LINK->L2RETRIES >= PORT->PORTN2)
{
// RETRIED N2 TIMES - Give up
CONNECTFAILED(LINK); // TELL LEVEL 4 IT FAILED
if (PORT->TNC && PORT->TNC->Hardware == H_KISSHF)
DetachKISSHF(PORT);
CLEAROUTLINK(LINK);
return;
}
L2SENDXID(LINK);
return;
}
if (LINK->L2STATE == 2)
{
// CONNECTING
LINK->L2RETRIES++;
if (LINK->L2RETRIES >= PORT->PORTN2)
{
// RETRIED N2 TIMES - Give up
CONNECTFAILED(LINK); // TELL LEVEL 4 IT FAILED
if (PORT->TNC && PORT->TNC->Hardware == H_KISSHF)
DetachKISSHF(PORT);
CLEAROUTLINK(LINK);
return;
}
SENDSABM(LINK);
return;
}
if (LINK->L2STATE == 4)
{
// DISCONNECTING
LINK->L2RETRIES++;
if (LINK->L2RETRIES >= PORT->PORTN2)
{
// RETRIED N2 TIMES - JUST CLEAR OUT LINK
if (PORT->TNC && PORT->TNC->Hardware == H_KISSHF)
DetachKISSHF(PORT);
CLEAROUTLINK(LINK);
return;
}
L2SENDCOMMAND(LINK, DISC | PFBIT);
return;
}
if (LINK->L2STATE == 3)
{
// FRMR
LINK->L2RETRIES++;
if (LINK->L2RETRIES >= PORT->PORTN2)
{
// RETRIED N2 TIMES - RESET LINK
LINK->L2RETRIES = 0;
LINK->L2STATE = 2;
SENDSABM(LINK);
return;
}
}
// STATE 5 OR ABOVE
// SEND RR(P) UP TO N2 TIMES
LINK->L2RETRIES++;
if (LINK->L2RETRIES >= PORT->PORTN2)
{
// RETRIED N TIMES SEND A COUPLE OF DISCS AND THEN CLOSE
InformPartner(LINK, RETRIEDOUT); // TELL OTHER END ITS GONE
LINK->L2RETRIES -= 1; // Just send one DISC
LINK->L2STATE = 4; // CLOSING
L2SENDCOMMAND(LINK, DISC | PFBIT);
return;
}
SendSupervisCmd(LINK);
}
VOID SDFRMR(struct _LINKTABLE * LINK, struct PORTCONTROL * PORT)
{
PORT->L2FRMRTX++;
LINK->L2STATE = 3; // ENTER FRMR STATE
LINK->L2TIMER = LINK->L2TIME; //SET TIMER
SENDFRMR(LINK);
}
VOID SENDFRMR(struct _LINKTABLE * LINK)
{
// RESEND FRMR
struct PORTCONTROL * PORT;
MESSAGE * Buffer;
UCHAR * ptr;
Buffer = SETUPL2MESSAGE(LINK, FRMR);
if (Buffer == NULL)
return;
Buffer->ORIGIN[6] |= 0x80; // SET RESPONSE
ptr = &Buffer->PID;
*(ptr++) = LINK->SDRBYTE; // MOVE REJECT C-BYTE
*(ptr++) = LINK->LINKNR << 5 | LINK->LINKNS << 1;
*(ptr++) = LINK->SDREJF; // MOVE REJECT FLAGS
Buffer->LENGTH += 3;
PORT = LINK->LINKPORT;
Buffer->PORT = PORT->PORTNUMBER;
if (PORT)
PUT_ON_PORT_Q(PORT, Buffer);
else
ReleaseBuffer(Buffer);
return;
}
VOID CLEAROUTLINK(struct _LINKTABLE * LINK)
{
hookL2SessionDeleted(LINK);
seeifUnlockneeded(LINK);
CLEARL2QUEUES(LINK); // TO RELEASE ANY BUFFERS
memset(LINK, 0, sizeof(struct _LINKTABLE));
}
VOID L2SENDXID(struct _LINKTABLE * LINK)
{
// Set up and send XID
struct PORTCONTROL * PORT;
UCHAR * ptr;
unsigned int xidval;
MESSAGE * Buffer;
if (LINK->LINKPORT == 0)
return; //??? has been zapped
Buffer = SETUPL2MESSAGE(LINK, XID | PFBIT);
if (Buffer == NULL)
{
// NO BUFFERS - SET TIMER TO FORCE RETRY
LINK->L2TIMER = 10*3; // SET TIMER
return;
}
Buffer->DEST[6] |= 0x80; // SET COMMAND
ptr = &Buffer->PID;
// Set up default XID Mod 8
*ptr++ = 0x82; // FI
*ptr++ = 0x80; // GI
*ptr++ = 0x0;
*ptr++ = 0x10; // Length 16
*ptr++ = 0x02; // Classes of Procedures
*ptr++ = 0x02; // Length
*ptr++ = 0x00; //
*ptr++ = 0x21; // ABM Half Duplex
// We offer REJ, SREJ and SREJ Multiframe
*ptr++ = 0x03; // Optional Functions
*ptr++ = 0x03; // Len
// Sync TX, SREJ Multiframe 16 bit FCS, Mod 8, TEST,
// Extended Addressing, REJ, SREJ
xidval = OPMustHave | OPSREJ | OPSREJMult | OPREJ | OPMod8;
*ptr++ = xidval >> 16;
*ptr++ = xidval >> 8;
*ptr++ = xidval;
*ptr++ = 0x06; // RX Packet Len
*ptr++ = 0x02; // Len
*ptr++ = 0x08; //
*ptr++ = 0x00; // 2K bits (256) Bytes
*ptr++ = 0x08; // RX Window
*ptr++ = 0x01; // Len
*ptr++ = 0x07; // 7
Buffer->LENGTH = (int)(ptr - (UCHAR *)Buffer); // SET LENGTH
LINK->L2TIMER = ONEMINUTE; // (RE)SET TIMER
// FLAG BUFFER TO CAUSE TIMER TO BE RESET AFTER SEND
Buffer->Linkptr = LINK;
PORT = LINK->LINKPORT;
if (PORT)
{
Buffer->PORT = PORT->PORTNUMBER;
PUT_ON_PORT_Q(PORT, Buffer);
}
else
{
Buffer->Linkptr = 0;
ReleaseBuffer(Buffer);
}
}
VOID L2SENDCOMMAND(struct _LINKTABLE * LINK, int CMD)
{
// SEND COMMAND IN CMD
struct PORTCONTROL * PORT;
MESSAGE * Buffer;
if (LINK->LINKPORT == 0)
return; //??? has been zapped
Buffer = SETUPL2MESSAGE(LINK, CMD);
if (Buffer == NULL)
{
// NO BUFFERS - SET TIMER TO FORCE RETRY
if (CMD & PFBIT) // RESPONSE EXPECTED?
LINK->L2TIMER = 10*3; // SET TIMER
return;
}
Buffer->DEST[6] |= 0x80; // SET COMMAND
if (CMD & PFBIT) // RESPONSE EXPECTED?
{
LINK->L2TIMER = ONEMINUTE; // (RE)SET TIMER
// FLAG BUFFER TO CAUSE TIMER TO BE RESET AFTER SEND
Buffer->Linkptr = LINK;
}
PORT = LINK->LINKPORT;
if (PORT)
{
Buffer->PORT = PORT->PORTNUMBER;
PUT_ON_PORT_Q(PORT, Buffer);
}
else
{
Buffer->Linkptr = 0;
ReleaseBuffer(Buffer);
}
}
VOID L2SENDRESPONSE(struct _LINKTABLE * LINK, int CMD)
{
// SEND Response IN CMD
struct PORTCONTROL * PORT;
MESSAGE * Buffer;
Buffer = SETUPL2MESSAGE(LINK, CMD);
if (Buffer == NULL)
{
// NO BUFFERS - SET TIMER TO FORCE RETRY
if (CMD & PFBIT) // RESPONSE EXPECTED?
LINK->L2TIMER = 10*3; // SET TIMER
return;
}
Buffer->ORIGIN[6] |= 0x80; // SET RESPONSE
LINK->L2SLOTIM = T3 + rand() % 15; // SET FRAME SENT RECENTLY
PORT = LINK->LINKPORT;
Buffer->PORT = PORT->PORTNUMBER;
if (PORT)
PUT_ON_PORT_Q(PORT, Buffer);
else
ReleaseBuffer(Buffer);
}
MESSAGE * SETUPL2MESSAGE(struct _LINKTABLE * LINK, UCHAR CMD)
{
MESSAGE * Buffer;
UCHAR * ptr;
Buffer = GetBuff();
if (Buffer == NULL)
return NULL;
ptr = SETUPADDRESSES(LINK, Buffer); // copy addresses
// ptr NOW POINTS TO COMMAND BYTE
*(ptr)++ = CMD;
Buffer->LENGTH = (int)(ptr - (UCHAR *)Buffer); // SET LENGTH
return Buffer;
}
VOID L3LINKCLOSED(struct _LINKTABLE * LINK, int Reason);
VOID InformPartner(struct _LINKTABLE * LINK, int Reason)
{
// LINK IS DISCONNECTING - IF THERE IS A CROSSLINK, SEND DISC TO IT
if (LINK->LINKTYPE == 3)
{
L3LINKCLOSED(LINK, Reason);
return;
}
if (LINK->CIRCUITPOINTER)
{
CloseSessionPartner(LINK->CIRCUITPOINTER);
CLEARSESSIONENTRY(LINK->CIRCUITPOINTER);
}
}
UINT RR_OR_RNR(struct _LINKTABLE * LINK)
{
UCHAR Temp;
TRANSPORTENTRY * Session;
LINK->L2FLAGS &= ~RNRSENT;
// SET UP APPROPRIATE SUPER COMMAND
if (LINK->LINKTYPE == 3)
// Node to Node - only busy if short of buffers
goto CHKBUFFS;
// UP OR DOWN LINK - SEE IF SESSION IS BUSY
if (LINK->CIRCUITPOINTER == 0)
goto CHKBUFFS; // NOT CONNECTED
Session = LINK->CIRCUITPOINTER; // TO CIRCUIT ENTRY
Temp = CHECKIFBUSYL2(Session); //TARGET SESSION BUSY?
if (Temp & L4BUSY)
goto SENDRNR; // BUSY
CHKBUFFS:
if (QCOUNT < 20)
goto SENDRNR; // NOT ENOUGH
// SEND REJ IF IN REJ STATE
if (LINK->L2STATE == 6)
{
// We may have the needed frame in RXFRAMES
CheckNSLoop2:
if (LINK->RXFRAMES[LINK->LINKNR])
{
// We have the first missing frame. Process it.
struct PORTCONTROL * PORT = LINK->LINKPORT;
MESSAGE * OldBuffer = Q_REM(&LINK->RXFRAMES[LINK->LINKNR]);
Debugprintf("L2 about to send REJ - process saved Frame %d", LINK->LINKNR);
PROC_I_FRAME(LINK, PORT, OldBuffer); // Passes on or releases Buffer
// NR has been updated.
// Clear REJ if we have no more saved
if (LINK->Ver2point2) // Using SREJ?
{
// see if any frames saved.
int i;
for (i = 0; i < 8; i++)
{
if (LINK->RXFRAMES[i])
goto stayinREJ2;
}
// Drop through if no stored frames
}
LINK->L2STATE = 5;
LINK->L2FLAGS &= ~REJSENT;
stayinREJ2:
LINK->L2ACKREQ = 0; // Cancel Resptime (Set by PROC_I_FRAME)
goto CheckNSLoop2; // See if OK or we have another saved frame
}
if (LINK->L2STATE == 6)
// if we support SREJ send that instesd or REJ
if (LINK->Ver2point2) // We only allow 2.2 with SREJ Multi
return SREJ;
else
return REJ;
}
return RR;
SENDRNR:
LINK->L2FLAGS |= RNRSENT; // REMEMBER
return RNR;
}
VOID ConnectFailedOrRefused(struct _LINKTABLE * LINK, char * Msg);
VOID CONNECTFAILED(struct _LINKTABLE * LINK)
{
ConnectFailedOrRefused(LINK, "Failure with");
}
VOID CONNECTREFUSED(struct _LINKTABLE * LINK)
{
ConnectFailedOrRefused(LINK, "Busy from");
}
VOID L3CONNECTFAILED(struct _LINKTABLE * LINK);
VOID ConnectFailedOrRefused(struct _LINKTABLE * LINK, char * Msg)
{
// IF DOWNLINK, TELL PARTNER
// IF CROSSLINK, TELL ROUTE CONTROL
struct DATAMESSAGE * Buffer;
UCHAR * ptr1;
char Normcall[10];
TRANSPORTENTRY * Session;
TRANSPORTENTRY * InSession;
if (LINK->LINKTYPE == 3)
{
L3CONNECTFAILED(LINK); // REPORT TO LEVEL 3
return;
}
if (LINK->CIRCUITPOINTER == 0) // No crosslink??
return;
Buffer = GetBuff();
if (Buffer == NULL)
return;
// SET UP HEADER
Buffer->PID = 0xf0;
ptr1 = SetupNodeHeader(Buffer);
Normcall[ConvFromAX25(LINK->LINKCALL, Normcall)] = 0;
ptr1 += sprintf(ptr1, "%s %s\r", Msg, Normcall);
Buffer->LENGTH = (int)(ptr1 - (UCHAR *)Buffer);
Session = LINK->CIRCUITPOINTER; // GET CIRCUIT TABLE ENTRY
InSession = Session->L4CROSSLINK; // TO INCOMMING SESSION
CLEARSESSIONENTRY(Session);
if (InSession)
{
InSession->L4CROSSLINK = NULL; // CLEAR REVERSE LINK
C_Q_ADD(&InSession->L4TX_Q, Buffer);
PostDataAvailable(InSession);
}
else
ReleaseBuffer(Buffer);
}
VOID SENDCONNECTREPLY(struct _LINKTABLE * LINK)
{
// LINK SETUP COMPLETE
struct DATAMESSAGE * Buffer;
UCHAR * ptr1;
char Normcall[10];
TRANSPORTENTRY * Session;
TRANSPORTENTRY * InSession;
if (LINK->LINKTYPE == 3)
return;
// UP/DOWN LINK
if (LINK->CIRCUITPOINTER == 0) // No crosslink??
return;
Buffer = GetBuff();
if (Buffer == NULL)
return;
// SET UP HEADER
Buffer->PID = 0xf0;
ptr1 = SetupNodeHeader(Buffer);
Normcall[ConvFromAX25(LINK->LINKCALL, Normcall)] = 0;
ptr1 += sprintf(ptr1, "Connected to %s\r", Normcall);
Buffer->LENGTH = (int)(ptr1 - (UCHAR *)Buffer);
Session = LINK->CIRCUITPOINTER; // GET CIRCUIT TABLE ENTRY
Session->L4STATE = 5;
InSession = Session->L4CROSSLINK; // TO INCOMMONG SESSION
if (InSession)
{
C_Q_ADD(&InSession->L4TX_Q, Buffer);
PostDataAvailable(InSession);
}
}
TRANSPORTENTRY * SetupSessionForL2(struct _LINKTABLE * LINK)
{
TRANSPORTENTRY * NewSess = L4TABLE;
int Index = 0;
while (Index < MAXCIRCUITS)
{
if (NewSess->L4USER[0] == 0)
{
// Got One
LINK->CIRCUITPOINTER = NewSess; // SETUP LINK-CIRCUIT CONNECTION
memcpy(NewSess->L4USER, LINK->LINKCALL, 7);
memcpy(NewSess->L4MYCALL, MYCALL, 7); // ALWAYS USE _NODE CALL
NewSess->CIRCUITINDEX = Index; //OUR INDEX
NewSess->CIRCUITID = NEXTID;
NEXTID++;
if (NEXTID == 0)
NEXTID++; // kEEP nON-ZERO
NewSess->L4TARGET.LINK = LINK;
NewSess->L4CIRCUITTYPE = L2LINK | UPLINK;
NewSess->L4STATE = 5; // SET LINK ACTIVE
NewSess->SESSPACLEN = LINK->LINKPORT->PORTPACLEN;
NewSess->SESSIONT1 = L4T1; // Default
NewSess->L4WINDOW = (UCHAR)L4DEFAULTWINDOW;
return NewSess;
}
Index++;
NewSess++;
}
return NULL;
}
VOID Digipeat(struct PORTCONTROL * PORT, MESSAGE * Buffer, UCHAR * OurCall, int toPort, int UIOnly) // Digi it (if enabled)
{
// WE MAY HAVE DISABLED DIGIPEAT ALTOGETHER, (DIGIFLAG=0),
// OR ALLOW ALLOW ONLY UI FRAMES TO BE DIGIED (DIGIFLAG=-1)
// toPort and UIOnly are used for Cross Port digi feature
int n;
if (PORT->DIGIFLAG == 0 && toPort == 0)
{
ReleaseBuffer(Buffer);
return;
}
OurCall[6] |= 0x80; // SET HAS BEEN REPEATED
// SEE IF UI FRAME - scan forward for end of address bit
n = 8;
while ((OurCall[6] & 1) == 0)
{
OurCall += 7;
if ((OurCall - &Buffer->CTL) > 56)
{
// Run off end before findin end of address
ReleaseBuffer(Buffer);
return;
}
}
if (toPort) // Cross port digi
{
if (((OurCall[7] & ~PFBIT) == 3) || UIOnly == 0)
{
// UI or Digi all
Buffer->PORT = toPort; // update port no in header
PORT = GetPortTableEntryFromPortNum(toPort);
if (PORT == NULL)
ReleaseBuffer(Buffer);
else
PUT_ON_PORT_Q(PORT, Buffer);
return;
}
else
{
ReleaseBuffer(Buffer);
return;
}
}
if ((OurCall[7] & ~PFBIT) == 3)
{
// UI
// UI FRAME. IF DIGIMASK IS NON-ZERO, SEND TO ALL PORTS SET, OTHERWISE SEND TO DIGIPORT
PORT->L2DIGIED++;
if (toPort)
{
// Cross port digi
PORT = GetPortTableEntryFromPortNum(toPort);
Buffer->PORT = PORT->DIGIPORT; // update port no in header
if (PORT == NULL)
ReleaseBuffer(Buffer);
else
PUT_ON_PORT_Q(PORT, Buffer);
return;
}
if (PORT->DIGIMASK == 0)
{
if (PORT->DIGIPORT) // Cross Band Digi?
{
Buffer->PORT = PORT->DIGIPORT; // update port no in header
PORT = GetPortTableEntryFromPortNum(PORT->DIGIPORT);
if (PORT == NULL)
{
ReleaseBuffer(Buffer);
return;
}
}
PUT_ON_PORT_Q(PORT, Buffer);
}
else
{
DigiToMultiplePorts(PORT, Buffer);
ReleaseBuffer(Buffer);
}
return;
}
// Not UI - Only Digi if Digiflag not -1
if (PORT->DIGIFLAG == -1)
{
ReleaseBuffer(Buffer);
return;
}
PORT->L2DIGIED++;
if (PORT->DIGIPORT) // Cross Band Digi?
{
Buffer->PORT = PORT->DIGIPORT; // update port no in header
PORT = GetPortTableEntryFromPortNum(PORT->DIGIPORT);
if (PORT == NULL)
{
ReleaseBuffer(Buffer);
return;
}
}
PUT_ON_PORT_Q(PORT, Buffer);
}
BOOL CheckForListeningSession(struct PORTCONTROL * PORT, MESSAGE * Msg)
{
TRANSPORTENTRY * L4 = L4TABLE;
struct DATAMESSAGE * Buffer;
int i = MAXCIRCUITS;
UCHAR * ptr;
while (i--)
{
if ((CountBits64(L4->LISTEN) == 1) && ((1 << ((Msg->PORT & 0x7f) - 1) && L4->LISTEN)))
{
// See if he is calling our call
UCHAR ourcall[7]; // Call we are using (may have SSID bits inverted
memcpy(ourcall, L4->L4USER, 7);
ourcall[6] ^= 0x1e; // Flip SSID
if (CompareCalls(Msg->DEST, ourcall))
{
// Get Session Entry for Downlink
TRANSPORTENTRY * NewSess = L4TABLE;
struct _LINKTABLE * LINK;
char Normcall[10];
int Index = 0;
while (Index < MAXCIRCUITS)
{
if (NewSess->L4USER[0] == 0)
{
// Got One
L4->L4CROSSLINK = NewSess;
NewSess->L4CROSSLINK = L4;
memcpy(NewSess->L4USER, L4->L4USER, 7);
memcpy(NewSess->L4MYCALL, L4->L4USER, 7);
NewSess->CIRCUITINDEX = Index; //OUR INDEX
NewSess->CIRCUITID = NEXTID;
NewSess->L4STATE = 5;
NewSess->L4CIRCUITTYPE = L2LINK+UPLINK;
NEXTID++;
if (NEXTID == 0)
NEXTID++; // kEEP nON-ZERO
NewSess->SESSIONT1 = L4->SESSIONT1;
NewSess->L4WINDOW = (UCHAR)L4DEFAULTWINDOW;
// SET UP NEW SESSION (OR RESET EXISTING ONE)
FindLink(Msg->ORIGIN, ourcall, PORT->PORTNUMBER, &LINK);
if (LINK == NULL)
return FALSE;
memcpy(LINK->LINKCALL, Msg->ORIGIN, 7);
LINK->LINKCALL[6] &= 0xFE;
memcpy(LINK->OURCALL, ourcall, 7);
LINK->LINKPORT = PORT;
LINK->L2TIME = PORT->PORTT1;
/*
// Copy Digis
n = 7;
ptr = &LINK->DIGIS[0];
while (axcalls[n])
{
memcpy(ptr, &axcalls[n], 7);
n += 7;
ptr += 7;
LINK->L2TIME += 2 * PORT->PORTT1; // ADJUST TIMER VALUE FOR 1 DIGI
}
*/
LINK->LINKTYPE = 2; // DOWNLINK
LINK->LINKWINDOW = PORT->PORTWINDOW;
RESET2(LINK); // RESET ALL FLAGS
LINK->L2STATE = 5; // CONNECTED
LINK->CIRCUITPOINTER = NewSess;
NewSess->L4TARGET.LINK = LINK;
if (PORT->PORTPACLEN)
NewSess->SESSPACLEN = L4->SESSPACLEN = PORT->PORTPACLEN;
L2SENDUA(PORT, Msg, Msg); // RESET OF DOWN/CROSSLINK
L4->LISTEN = FALSE; // Take out of listen mode
// Tell User
Buffer = GetBuff();
if (Buffer == NULL)
return TRUE;
// SET UP HEADER
Buffer->PID = 0xf0;
ptr = &Buffer->L2DATA[0];
Normcall[ConvFromAX25(LINK->LINKCALL, Normcall)] = 0;
ptr += sprintf(ptr, "Incoming call from %s\r", Normcall);
Buffer->LENGTH = (int)(ptr - (UCHAR *)Buffer);
C_Q_ADD(&L4->L4TX_Q, Buffer);
PostDataAvailable(L4);
return TRUE;
}
Index++;
NewSess++;
}
return FALSE;
}
}
L4++;
}
return FALSE;
}
int COUNTLINKS(int Port);
VOID SuspendOtherPorts(struct TNCINFO * ThisTNC);
VOID ReleaseOtherPorts(struct TNCINFO * ThisTNC);
int CheckKissInterlock(struct PORTCONTROL * PORT, int Exclusive)
{
// This checks for interlocked kiss and other ports. Returns 1 if attach/connect not allowed
// If Exclusive is not set allow connects on specified port up to l2limit,
// If Exclusive is set also don't allow any connects on specified port.
// Generally use Exclusive if locking a port that doesn't allow shared access, eg ARDOP, VARAus
// Maybe only Exclusive is needed, and just check session mode ports. Sharing of KISS ports is controlled by USERS
int Interlock = PORT->PORTINTERLOCK;
if (Interlock == 0)
return 0; // No locking
PORT = PORTTABLE;
if (Exclusive)
{
while(PORT)
{
if (PORT->TNC)
{
struct TNCINFO * TNC = PORT->TNC;
if (Interlock == TNC->RXRadio || Interlock == TNC->TXRadio) // Same Group
{
// See if port in use
int n;
for (n = 0; n <= 26; n++)
{
if (TNC->PortRecord->ATTACHEDSESSIONS[n])
{
return TNC->Port; ; // Refuse Connect
}
}
}
}
PORT = PORT->PORTPOINTER;
}
}
return 0; // ok to connect
}
int seeifInterlockneeded(struct PORTCONTROL * PORT)
{
// Can we just call SuspendOtherPorts - it won't do any harm if already suspended
// No, at that needs a TNC Record, so duplicate code here
int i;
int Interlock = PORT->PORTINTERLOCK;
struct TNCINFO * TNC;
if (Interlock == 0)
return 0; // No locking
for (i = 1; i <= MAXBPQPORTS; i++)
{
TNC = TNCInfo[i];
if (TNC)
if (Interlock == TNC->RXRadio || Interlock == TNC->TXRadio) // Same Group
if (TNC->SuspendPortProc && TNC->PortRecord->PORTCONTROL.PortSuspended == FALSE)
TNC->SuspendPortProc(TNC, TNC);
}
return 0;
}
int seeifUnlockneeded(struct _LINKTABLE * LINK)
{
// We need to see if any other links are active on any interlocked KISS ports. If not, release the lock
int i;
int links = 0;
int Interlock;
struct TNCINFO * TNC;
struct PORTCONTROL * PORT = LINK->LINKPORT;
if (PORT == NULL)
return 0;
// Should only be called for KISS links, but just in case
if (PORT->PORTTYPE > 12) // INTERNAL or EXTERNAL?
return 0; // Not KISS Port
Interlock = PORT->PORTINTERLOCK;
if (Interlock == 0)
return 0; // No locking
// Count all L2 links on interlocked KISS ports
PORT = PORTTABLE;
while(PORT)
{
if (PORT->PORTTYPE <= 12) // INTERNAL or EXTERNAL?
if (Interlock == PORT->PORTINTERLOCK)
links += COUNTLINKS(PORT->PORTNUMBER);
PORT = PORT->PORTPOINTER;
}
if (links > 1) // must be the one we are closing
return 0; // Keep lock
for (i = 1; i <= MAXBPQPORTS; i++)
{
TNC = TNCInfo[i];
if (TNC)
if (Interlock == TNC->RXRadio || Interlock == TNC->TXRadio) // Same Group
if (TNC->ReleasePortProc && TNC->PortRecord->PORTCONTROL.PortSuspended == TRUE)
TNC->ReleasePortProc(TNC);
}
return 0;
}
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