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Assembly Source File | 1993-05-14 | 57KB | 1,687 lines

NAME MSNPDI ; File MSNPDI.ASM ; Packet Driver and ODI interface ; ; Copyright (C) 1985, 1992, Trustees of Columbia University in the ; City of New York. Permission is granted to any individual or institution ; to use this software as long as it is not sold for profit. This copyright ; notice must be retained. This software may not be included in commercial ; products without written permission of Columbia University. ; ; Permission is granted to use this file as a guide in developing commercial ; products. If substantial portions are used crediting the source is ; recommended. ; ; Written by Joe R. Doupnik, Utah State University, Logan Utah 84322 ; jrd@cc.usu.edu, jrd@usu.Bitnet. ; ; Packet Driver reference: ; "PC/TCP Version 1.09 Packet Driver Specification", FTP Software, Inc., ; September-14-1989. ; ; ODI references: ; "Open Data-Link Interface Developer's Guide for DOS Network Layer Protocol ; Stacks", Novell Inc, document number 100-001218-001 (1992, but no printed ; date). ; "Open Data-Link Interface Developer's Guide for NetWare v3.1x Server ; Driver Protocol Stacks", Novell Inc, document number 100-001196-00, v1.0, ; 19 Sept 1991. ; "Open Data-Link Interface LAN Driver Developer's Guide for DOS", Novell Inc, ; document number 107-000010-001, Revision i, 13 Nov 1990. ; ; C language interface presumes the Small memory model and Microsoft C. ; Assembler is MS MASM v6. ; ; These procedures interface between ODI or a Packet Driver and the main ; protocol stack to both send and receive packets. The upper levels provide ; and receive packets framed as Ethernet_II (Blue Book/DIX), and receive ; ARP information particular to the physical frames involved. Conversion of ; this internal form to the actual framing method on the wire is done by ODI. ; The receive buffer is external to this routine. Received packets are linked ; into the buffer on an order of arrival basis (and sized to fit). High level ; reception has to poll the receive buffer queue. Transmitted packets are ; operated with a single external buffer, and sending blocks until the lower ; level driver material is ready for us. Initialization, status, attachment, ; and disengagment procedures are here. ; External int kpdint is used by pdinit() to select between Packet Driver ; and ODI interfaces. Call pdinit() to initialize the system, then call ; pdaccess() to register each desired frame TYPE, call pdclose() to release ; each frame TYPE. ; Packet senders call pkt_send() directly. ; Packet receivers examine the external packet buffer for packets. ; ARP information is returned in external ints arp_hardware (hardware ARP ; type code) and MAC_len (length of MAC address, in bytes). See table below ; for the possible pairs. ; Packet Driver usage is limited to Ethernet_II/DIX and SLIP. ODI usage is ; at least Ethernets, Token Ring, Arcnet, and others untested here. ; ; Edit history ; Last edit ; 26 August 1992 getintv equ 35h ; DOS get interrupt vector to es:bx dos equ 21h lf equ 0ah fopen equ 3dh ; DOS file operations fclose equ 3eh fread equ 3fh pdgetinfo equ 1 ; Packet Driver functions pd_access equ 2 pd_release equ 3 pd_send equ 4 pd_get_address equ 6 eaddr_len equ 6 ; length of an Ethernet address ETH_MSS equ 534 ; Correlate with msntcp.h IF_EII equ 1 ; Ethernet II interface type IF_SLIP equ 6 ; SLIP interface type link struc ; receiver buffer link structure flag db 0 ; buffer use flag bufnum db 0 ; buffer write sequence number count dw 0 ; count of bytes to follow link ends linksize equ 4 ; bytes in link structure ; Novell ODI material, based on LSL v1.2. ; Most of these header structures were taken from Novell file ODI.INC, ; and parts have been tailored for Kermit. Information on the "new" item in ; the lookahead structure is compliments of Novell, private correspondence. ; Event Control Block Structure ECBstruct struc nextlink dd 0 ; leave intact prevlink dd 0 ; leave intact status dw 0 ; general status esr dd 0 ; addr of event service routine stackid dw 0 ; protocol stack ident protid db 6 dup (0) ; sending only boardnum dw 0 ; sending, MILD board number immaddr db 6 dup (0) ; MAC destination address driverws db 4 dup (0) ; their work space protocolws dw 4 dup (0) ; our work space datalen dw 0 ; total length of sent buffer fragcount dw 1 ; number of buffer pieces frag1addr dw 0,0 ; seg:offset of first buffer frag1len dw 0 ; length of first buf frag ECBstruct ends ; 26 words ; Look Ahead Structure LookAheadStruc struc LMediaHeaderPtr dd 0 ; pointer to MAC header LookAheadPtr dd 0 ; pointer to pkt Data LookAheadLen dw 0 ; length of pkt Data field LProtID db 6 dup (0) ; protocol ident LBoardNum dw -1 ; logical board of rcv'd pkt DataLookAheadDataSize dd 0 ; new field, exists if bit 7 of the ; Driver's Configuration Table Mode Flags is set. LookAheadStruc ends ; Rx Destination Address Type (First byte of ECB.DriverWS) ECB_DIRECT equ 00h ;Physical destination address ECB_MULTICAST equ 01h ;Multicast destination address ECB_BROADCAST equ 03h ;Broadcast destination address ; System Error Code Definitions LSLERR_OUT_OF_RESOURCES equ 8001h LSLERR_BAD_PARAMETER equ 8002h LSLERR_NO_MORE_ITEMS equ 8003h LSLERR_ITEM_NOT_PRESENT equ 8004h LSLERR_FAIL equ 8005h LSLERR_RX_OVERFLOW equ 8006h LSLERR_CANCELLED equ 8007h LSLERR_BAD_COMMAND equ 8008h LSLERR_DUPLICATE_ENTRY equ 8009h LSLERR_NO_SUCH_HANDLER equ 800ah LSLERR_NO_SUCH_DRIVER equ 800bh ; LSL MLID Services Function Codes MLIDSUP_GET_ECB equ 0 MLIDSUP_RETURN_ECB equ 1 MLIDSUP_DEFRAG_ECB equ 2 MLIDSUP_SCHEDULE_AES_EVENT equ 3 MLIDSUP_CANCEL_AES_EVENT equ 4 MLIDSUP_GET_INTERVAL_MARKER equ 5 MLIDSUP_DEREGISTER_MLID equ 6 MLIDSUP_HOLD_RECV_EVENT equ 7 MLIDSUP_START_CRITICAL_SECTION equ 8 MLIDSUP_END_CRITICAL_SECTION equ 9 MLIDSUP_CRITICAL_SECTION_STATUS equ 10 MLIDSUP_SERVICE_EVENTS equ 11 MLIDSUP_SEND_COMPLETE equ 14 MLIDSUP_ADD_PID equ 15 MLIDSUP_GET_STACK_ECB equ 16 ; LSL Protocol Stack Services Function Codes PROTSUP_GET_ECB equ 0 PROTSUP_RETURN_ECB equ 1 PROTSUP_SCHEDULE_AES_EVENT equ 3 PROTSUP_CANCEL_EVENT equ 4 PROTSUP_GET_INTERVAL_MARK equ 5 PROTSUP_REGISTER_STACK equ 6 PROTSUP_DEREGISTER_STACK equ 7 PROTSUP_REGISTER_DEFAULT_STACK equ 8 PROTSUP_DEREGISTER_DEFAULT_STACK equ 9 PROTSUP_REGISTER_PRESCAN_STACK equ 10 PROTSUP_DEREGISTER_PRESCAN_STACK equ 11 PROTSUP_SEND_PACKET equ 12 PROTSUP_GET_PROTNUM_FROM_NAME equ 16 PROTSUP_GET_PID_PROTNUM_MLIDNUM equ 17 PROTSUP_GET_MLID_CTL_ENTRY equ 18 PROTSUP_GET_PROTO_CTL_ENTRY equ 19 PROTSUP_GET_LSL_STATS equ 20 PROTSUP_BIND_STACK_TO_MLID equ 21 PROTSUP_UNBIND_STACK_FROM_MLID equ 22 PROTSUP_ADD_PID equ 23 PROTSUP_RELINQUISH_CONTROL equ 24 PROTSUP_GET_LSL_CONFIG equ 25 ; LSL General Services Function Codes GENSERV_ALLOC_MEMORY equ 0 GENSERV_FREE_MEMORY equ 1 GENSERV_REALLOC_MEMORY equ 2 GENSERV_MEMORY_STATISTICS equ 3 GENSERV_ADD_MEMORY_TO_POOL equ 4 GENSERV_ADD_GENERAL_SERVICE equ 5 GENSERV_REMOVE_GENERAL_SERVICE equ 6 GENSERV_GET_NETCFG_PATH equ 7 ; LSL Configuration Table LSLConfigurationStructure struc LConfigTableMajorVer db 1 LConfigTableMinorVer db 0 LNumLSLRxBuffers dd 0 LRxBufferSize dd 0 ;Buffer size NOT including ECB struc size LMajorVersion db 0 LMinorVersion db 0 LConfigTableReserved db 16 dup (0) LSLConfigurationStructure ends ; MLID Control Commands GET_MLID_CONFIGURATION equ 0 GET_MLID_STATISTICS equ 1 ADD_MULTICAST_ADDRESS equ 2 DELETE_MULTICAST_ADDRESS equ 3 MLID_SHUTDOWN equ 5 MLID_RESET equ 6 CREATE_CONNECTION equ 7 REMOVE_CONNECTION equ 8 SET_LOOK_AHEAD_SIZE equ 9 DRIVER_POLL equ 12 ; MLID Configuration Table Structure MLIDConfigurationStructure struc MSignature db 'HardwareDriverMLID',8 dup (' ') MConfigTableMajorVer db 1 MConfigTableMinorVer db 11 MNodeAddress db 6 dup (?) MModeFlags dw ? MBoardNumber dw ? MBoardInstance dw ? MMaxPacketSize dw ? MBestDataSize dw ? MWorstDataSize dw ? MCardLongName dd ? MCardShortName dd ? ; visible board name MFrameString dd ? MReserved0 dw 0 ;Must be set to 0 MFrameID dw ? MTransportTime dw ? MRouteHandler dd ? ;Only for Token-Ring MLookAheadSize dw ? MLineSpeed dw ? ;In Mbps or Kbps MReserved1 db 8 dup (0) ;Must be set to 0 MMLIDMajorVer db ? MMLIDMinorVer db ? MFlags dw ? MSendRetries dw ? MLink dd ? MSharingFlags dw ? MSlot dw ? MIOAddress1 dw ? MIORange1 dw ? MIOAddress2 dw ? MIORange2 dw ? MMemoryAddress1 dd ? MMemorySize1 dw ? MMemoryAddress2 dd ? MMemorySize2 dw ? MIntLine1 db ? MIntLine2 db ? MDMALine1 db ? MDMALine2 db ? MLIDConfigurationStructure ends ; MLID Config Table 'MFlags' bit definitions. EISA equ 01h ;EISA Bus ISA equ 02h ;PC/AT Bus MCA equ 04h ;PS/2 MCA Bus Len_Info equ 40h ; pkt data length in lookahead info ; MLID Config Table 'MModeFlags' bit definitions (no promiscuous mode). MRealDriverBit equ 0001h MUsesDMABit equ 0002h MGuaranteedDeliveryBit equ 0004h ;100% reliable on transmits MMulticastBit equ 0008h MNeedsPollingBit equ 0020h MRawSendBit equ 0040h ; Registered Stack structure, used during registration only StackInfoStruc struc StackNamePtr dd ip_string ; ptr to short name StackReceiveHandler dd ip_rcvr ; rcv routine StackControlHandler dd pcontrol ; control routine StackInfoStruc ends ; Protocol Control Commands GET_STACK_CONFIGURATION equ 0 GET_STACK_STATISTICS equ 1 BIND_TO_MLID equ 2 UNBIND_FROM_MLID equ 3 INFORM_MLID_DEREGISTERED equ 4 ; Protocol Configuration Table ProtocolConfigStructure struc PConfigTableMajorVer db 1 PConfigTableMinorVer db 0 PProtocolLongName dd plname PProtocolShortName dd psname ; "KERMIT" PProtocolMajorVer db 3 ; MSK v3.12 PProtocolMinorVer db 12 PConfigTableReserved db 16 dup (0) ProtocolConfigStructure ends ; Protocol Statistics Table ProtocolStatStructure struc PStatTableMajorVer db 1 PStatTableMinorVer db 0 PNumGenericCounters dw 3 ; just those below PValidCounterMask dd 111b ; bitfield, 3 valids PTotalTxPackets dw 2 dup (0) PTotalRxPackets dw 2 dup (0) PIgnoredRxPackets dw 2 dup (0) PNumCustomCounters dw 0 ; none ProtocolStatStructure ends pinfo struc ; per protocol local data for ecb pstack dw 0 ; StackID pprotid db 6 dup (0) ; ProtID pboard dw 0 ; boardnum pinfo ends _TEXT SEGMENT WORD PUBLIC 'CODE' _TEXT ENDS _DATA SEGMENT WORD PUBLIC 'DATA' _DATA ENDS CONST SEGMENT WORD PUBLIC 'CONST' CONST ENDS _BSS SEGMENT WORD PUBLIC 'BSS' _BSS ENDS DGROUP GROUP CONST, _BSS, _DATA ASSUME CS: _TEXT, DS: DGROUP, SS: DGROUP, ES:NOTHING _DATA SEGMENT extrn _pktbuf_wrote:word, _pktwnum:byte, _kpdint:word extrn _eth_addr:byte, _arp_hardware:word, _MAC_len:word pdsignature db 'PKT DRVR' ; signature of a Packet Driver if_type dw 0 ; interface type if_class db 0 ; interface class if_num db 0 ; interface number if_func db 0 ; interface functionality if_version dw 0 ; interface version iptype db 8,0 ; IP packet type iptypelen equ $-iptype ; length of type field for iptype pktbufoff dw 0 ; offset of packet buffer SLIPmac dw 0,0,2 ; fake SLIP dest Ethernet address ; ODI material useodi db 0 ; non-zero if using ODI for transport lslsig db 'LINKSUP$' ; LSL presence signature lslsiglen equ $-lslsig lslinit dd 0 ; LSL init entry point ; LSL entry structure, do not separate lslsupport dd 0 ; LSL protocol support API entry point lslservice dd 0 ; LSL general services API entry point mlidcont dd 0 ; MLID Control entry point ecbr_qty equ 4 ; number of receive ECB's to allocate maketab MACRO ; macro to make receiver ecbs cnt = 0 rept ecbr_qty - 1 ecbstruct <,,,odircmp> cnt = cnt + 1 endm ENDM ecbr ecbstruct <,,,odircmp> ; first receiver ECB maketab ; make table of the other ecbr's ecbx ecbstruct <,,,odixcmp> ; one ECB for transmission ecbr_busy db ecbr_qty dup (0) ; our ecbr locks ecbx_busy db 0 ; non-zero if ECBx owned by ODI ecbr_num dw 0 ; temp to hold index of ecbr/ecbr_busy rcvtype dw 0 ; temp, holds protocol TYPE for rcv pconfig ProtocolConfigStructure <> ; as the name says pstats ProtocolStatStructure <> ; protocol statistics registerstk StackInfoStruc <> ; bound stack setup structure plname db 13,'MS-DOS Kermit',0 ; cnt, protocol stack long name, null protword db 8,'PROTOCOL',0 ; three NET.CFG keywords for Kermit psname db 6,'KERMIT',0 ; cnt, protocol stack short name, null bindword db 4,'BIND',0 ; third keyword ip_type equ 0008h ; Protocol TYPEs, big endian/net order arp_type equ 0608h rarp_type equ 3580h ip_string db 2,'IP',0 ; strings to match in NET.CFG file arp_string db 3,'ARP',0 ; to select pkt TYPEs rarp_string db 4,'RARP',0 ; RARP is optional ip_stackid pinfo <> ; StackID, Protid, boardnum arp_stackid pinfo <> ; for each protocol rarp_stackid pinfo <> bcast db 6 dup (0ffh) ; Broadcast address, for reception readnetcfg db 0 ; non-zero if have read NET.CFG useboard dw -1 ; board to be used, -1 = not inited bdname db 0,16 dup (0) ; length, 15 text, null, bound board tells_len db 0 ; if MLID tells pkt len for lookahead tempb db 0 temp dw 0 ; parallel lists of NetWare ODI frame types, address lengths, ARP idents frame_type db 2,3,4,5,6,7, 9,10,11,14,15,16,23 num_frames equ ($ - frame_type) frame_adlen db 6,6,6,6,6,6, 1,6, 6, 1, 6, 6, 6 hardware_type db 1,6,6,6,6,12,4,6, 6, 7, 6, 6, 6 _DATA ENDS ; ODI Frame types, frame strings, length (bytes) of a MAC level address: ; type frame string MAC_len hardware comments ; 0 VIRTUAL_LAN 0 0 no MAC header used ; 1 LOCALTALK 6 11 Apple (Ether/Tokentalk is 802) ; 2 ETHERNET_II 6 1 Blue Book ; 3 ETHERNET_802.2 6 6 802.3 with 802.2 wrap ; 4 TOKEN-RING 6 4 802.5 with 802.2 wrap ; 5 ETHERNET_802.3 6 6 802.3 "raw", old Novell ; 6 802.4 6 6 Token Bus ; 7 NOVELL_PCN2 6 12 Novell's IBM PCnet2 ; 8 GNET 6 4 Gateway, assumed TRN-like ; 9 PRONET-10 1 4 Proteon TRN-like ; 10 ETHERNET_SNAP 6 1 802.3 with 802.2+SNAP ; 11 TOKEN-RING_SNAP 6 6 802.5 with 802.2+SNAP ; 12 LANPAC_II 6 ? Racore ; 13 ISDN 6 ? telco ; 14 NOVELL_RX-NET 1 7 Arcnet-like ; 15 IBM_PCN2_802.2 6 12 IBM PCnet2 with 802.2 ; 16 IBM_PCN2_SNAP 6 12 IBM PCnet2,802.2+SNAP ; 17 OMNINET/4 ? ? Corvus ; 18 3270_COAXA ? ? Harris ; 19 IP ? ? tunneled ; 20 FDDI_802.2 6 ? ; 21 IVDLAN_802.9 6 ? Commtex ; 22 DATACO_OSI ? ? Dataco ; 23 FDDI_SNAP 6 6 802.7, with 802.2+SNAP ; ; ARP hardware field, from RFC 1060 ; Type Description ; ---- ----------- ; 1 Ethernet (10Mb) ; 2 Experimental Ethernet (3Mb) ; 3 Amateur Radio AX.25 ; 4 Proteon ProNET Token Ring ; 5 Chaos ; 6 IEEE 802 Networks ; 7 ARCNET ; 8 Hyperchannel ; 9 Lanstar ; 10 Autonet Short Address ; 11 LocalTalk ; 12 LocalNet (IBM PCNet or SYTEK LocalNET) _TEXT segment pktdrvr proc near ; Packet Driver interrupt invokation PKTDRVI:int 60h ; Interrupt number, modified by startup code ret pktdrvr endp ; pdinit(ðeraddress) ; Initialize Packet Driver or ODI for use by this program. Stores Ethernet ; address (or MAC address). _kpdint is 0 to scan first for a Packet Driver ; interrupt and fall back to search for ODI, or is a number 60h..7fh to ; target only that PD interrupt, or is 'DO' to target only ODI. If a PD is ; used then _kpdint is modified to be the found interrupt value. ; A 6 byte MAC level address is returned for convenience, even for SLIP. ; Returns 1 for success, 0 for failure. public _pdinit _pdinit proc near push bp mov bp,sp push es push si push di push ds mov ax,dgroup mov ds,ax mov ax,[bp+4+0] ; get offset of pktbuf mov pktbufoff,ax ; save locally mov cx,60h ; interrupt range cmp _kpdint,0 ; user value given? je pdinit1 ; e = no mov cx,_kpdint ; use it cmp cx,'DO' ; special indicator to use ODI? je pdinit2 ; e = yes, skip Packet Driver pdinit1:mov ah,getintv ; get interrupt vector to es:bx mov al,cl ; vector number int dos mov si,offset dgroup:pdsignature ; look for signature push cx mov cx,length pdsignature ; length of string mov di,bx add di,3 ; sig starts 3 bytes from entry point cld repe cmpsb ; compare bytes pop cx je pdinit3 ; e = found a match cmp _kpdint,0 ; user value given? jne pdinit2 ; ne = yes, so fail inc cx cmp cx,80h ; at end of range? jna pdinit1 ; na = not yet, try another int ; no Packet Driver found pdinit2:call odichk ; see if ODI is available jc pdinit5 ; c = no mov useodi,1 ; say using ODI mov _kpdint,'DO' ; signal ODI via PD interrupt variable mov if_class,1 ; say Ethernet_II for internal work mov di,[bp+4+2] ; get offset of user's buffer mov cx,eaddr_len ; length of address provided mov si,offset DGROUP:SLIPmac ; get fake Ethernet address cld ; in case code wants it early push ds pop es push di rep movsb ; copy to user buffer mov cx,ecbr_qty mov di,offset DGROUP:ecbr_busy ; clear receive ecb busy flags xor al,al rep stosb pop di clc pdinit5:jmp pdret ; exit (carry set is failure) ; Packet Driver details pdinit3:mov byte ptr PKTDRVI+1,cl ; force in new PD interrupt, code mod mov _kpdint,cx ; remember interrupt number ; find Ethernet address mov ah,pdgetinfo ; get Packet Driver information mov al,0ffh xor bx,bx ; optional handle push ds ; this call changes ds and si push si call pktdrvr ; call the Packet Driver pop si pop ds jc pdret ; c = failure pdinit6:mov if_type,dx ; save details for access calls mov if_class,ch mov if_num,cl mov if_func,al mov if_version,bx mov ah,pd_access ; access packets mov al,ch ; Ethernet class mov bx,dx ; type mov dl,cl ; interface number mov cx,iptypelen ; type length for iptype mov si,offset dgroup:iptype ; address of TYPE mov di,cs mov es,di mov di,offset pdrcvr ; ES:DI is our Packet Driver receiver call pktdrvr jc pdret ; c = failure mov bx,ax ; put returned handle in BX mov ax,DGROUP ; our data segment mov es,ax ; segment of Ethernet address buffer mov di,[bp+4+2] ; get offset of user's buffer mov cx,eaddr_len ; length of address wanted cmp if_class,IF_SLIP ; interface class of SLIP? jne pdinit4 ; ne = no mov si,offset DGROUP:SLIPmac ; get fake Ethernet address cld push di ; save in case PD actually uses it rep movsb ; copy to user buffer pop di pdinit4:mov ah,pd_get_address ; get the Ethernet address push bx ; save handle call pktdrvr ; get Ethernet address to es:di buf pop bx pushf ; save carry flag mov ah,pd_release ; release this Type, bx has handle call pktdrvr popf ; recover carry flag pdret: mov ax,1 ; return C status, 1 for success jnc pdret1 xor ax,ax ; 0 for failure pdret1: pop ds ; success pop di pop si pop es mov sp,bp ; restore stack pop bp ; recover bp reg ret _pdinit endp ; int pdinfo(& int version, & int class, & int pdtype, & int number, ; & int functionality) ; Get Packet Driver pedigree public _pdinfo _pdinfo proc near push bp mov bp,sp push di push cx push bx push ax ; save al for later use mov di,[bp+4+0] mov bx,if_version mov [di],bx ; return version mov al,if_class ; class xor ah,ah mov di,[bp+4+2] mov [di],ax ; return as an int mov di,[bp+4+4] mov dx,if_type mov [di],dx ; type mov di,[bp+4+6] xor ch,ch mov cl,if_num mov [di],cx ; interface number, as an int pop ax ; recover al mov di,[bp+4+8] xor ah,ah mov al,if_func mov [di],ax ; functionality, as an int mov ax,1 ; C style exit status, 1 = success pop bx pop cx pop di pop bp ret _pdinfo endp ; int pdclose(int handle) ; Close a Packet Driver or ODI handle. ; Returns (in AX) 1 if successful, else 0. public _pdclose _pdclose proc near push bp mov bp,sp push bx mov bx,[bp+4+0] ; handle cmp useodi,0 ; using ODI? je pdclos2 ; e = no mov ax,bx ; get handle call odiunbind ; unbind from LSL and MLID jmp short pdclos3 pdclos2:mov ah,pd_release ; release_type call pktdrvr pdclos3:mov ax,1 ; assume success jnc pdclos1 ; nc = success xor ax,ax ; 0 for failure pdclos1:pop bx pop bp ret _pdclose endp ; int pdaccess(char *type, typelen, int *handle) ; Register access for packet TYPE with the Packet Driver or ODI ; Provides a handle for the TYPE. ; Returns 1 for success, 0 for failure. public _pdaccess _pdaccess proc near push bp mov bp,sp push es push si push di push ds push es mov ax,dgroup ; set up data segment addressibility mov ds,ax mov al,if_class ; interface class (frame) mov bx,if_type ; interface type (vendor) mov dl,if_num ; interface number (board number) xor dh,dh mov si,[bp+4+0] ; get offset of packet TYPE buffer mov cx,[bp+4+2] ; typelen (length of buf contents) cmp useodi,0 ; using ODI? je pdacc8 ; e = no mov ax,[si] ; provide TYPE call odibind ; Bind to a virtual board jc pdacc1 ; c = fail, error code in AX jmp short pdacc9 ; store handle returned in AX pdacc8: cmp if_class,IF_SLIP ; SLIP? jne pdacc3 ; ne = no xor cx,cx ; TYPE len = 0 means accept all types pdacc3: mov di,cs ; ES:DI is our Packet Driver receiver mov es,di mov di,offset pdrcvr ; local receiver mov ah,pd_access ; set access call pktdrvr jc pdacc1 ; c = failure pdacc9: mov si,[bp+4+4] ; offset of handle mov [si],ax ; return the handle pdacc1: mov ax,1 ; C level status, 1 = success jnc pdacc2 ; nc = success xor ax,ax ; 0 = failure pdacc2: pop es pop ds pop di pop si pop es pop bp ret _pdaccess endp ; int pkt_send(char *buffer, int length) ; returns 1 on success, 0 on failure ; Send a packet. public _pkt_send _pkt_send proc near push bp mov bp,sp push es push ds push si push di ; don't trust lower levels on regs push cx mov ax,dgroup ; segment of outgoing buffer mov ds,ax ; will be DS:SI for Packet Driver mov si,[bp+4+0] ; buffer's offset (seg is dgroup) mov cx,[bp+4+2] ; buffer's length cmp useodi,0 ; using ODI? je pktsen5 ; e =no, use PD pktsen3:cmp ecbx_busy,0 ; is ODI transmit done yet? je pktsen4 ; e = yes, else we can't touch it yet mov bx,PROTSUP_RELINQUISH_CONTROL call lslsupport ; give time to LSL jmp short pktsen3 ; wait for done pktsen4:call odixmt ; do LSL transmit with DS:SI and CX sti ; interrupts back on (xmt turns off) jmp short pktsen1 ; done (AX non-zero if error) ; Note that checking for transmission errors is not readily done with async ; sending, so we cross our fingers and hope for the best. ; ; Packet Driver sending pktsen5:mov ah,pd_send ; send packet (buffer = ds:si) call pktdrvr ; invoke Packet Driver ; common exit pktsen1:mov ax,1 ; return C level success (1) jnc pktsen2 ; nc = success xor ax,ax ; else C level failure (0) pktsen2:pop cx pop di pop si pop ds pop es pop bp ret _pkt_send endp ; Our Packet Driver receiver, far called only by the Packet Driver and our ; local ODI code (odircvr and odircmp). ; Packet buffer linked list - ; each link is db flag ; 1 = free, 2 = in use, 4 = allocated ; ; but not in use yet, 0 = end of buf ; ; 8 = read but not freed. ; db _pktwnum ; sequential number of pkt written ; dw count ; length of data field ; db count dup (?) ; the allocated data field ; The head of the chain has a link like all others. ; The end of the chain has a link with flag == 0 and count = -BUFISZE ; to point to the beginning of the buffer (circular). ; Packet buffer garbage collection is done after the PD transfers a ; buffer to the application, and does so by relinking adjacent free ; blocks. ; _pktbuf_wrote is used to remember the link where the last write occurred ; and should be initialized to the tail link to point the next write to ; the beginning of the buffer. ; The Packet Driver and our ODI routines call this first with AX = 0 to ; obtain a buffer pointer in ES:DI from us (0:0 if we refuse the pkt) with ; CX = packet size, and again later with AX = 1 to post completion. pdrcvr proc far ; dummy Packet Driver receiver or ax,ax ; kind of upcall from PD jz pdrcvr1 ; z = first, get-a-buffer ; Second upcall, packet has xfered, DS:SI set by caller to buffer pushf ; save interrupt status cli ; interrupts off push ds push si push bx push ax ; assume DS:SI is one of our buffers mov ax,DGROUP mov ds,ax ; set ds to our data segment or si,si ; is it legal (from first upcall)? jz pdrcvr11 ; z = no, ignore this call sub si,linksize ; backup to link info cmp byte ptr [si].flag,4 ; is this buffer allocated (4)? jne pdrcvr8 ; ne = no, do cleanups and quit mov byte ptr [si].flag,2 ; flag = 2 for buffer is now ready mov si,pktbufoff ; start of packet buffer ; join contiguous free links pdrcvr8:mov al,[si].flag ; flags byte cmp al,1 ; is link free? jne pdrcvr10 ; ne = no, look for a free link pdrcvr9:mov bx,[si].count ; count (length) of this link mov al,[bx+si+linksize].flag; flag of following link cmp al,1 ; is next link free? jne pdrcvr10 ; ne = no, look for free link mov ax,[bx+si+linksize].count ; count taken from next link add ax,linksize ; plus the next link's info field add [si].count,ax ; add it to this count (merge links) jmp short pdrcvr9 ; re-examine this new longer link pdrcvr10:or al,al ; end of list? jz pdrcvr11 ; z = yes add si,[si].count ; look at next link (add count) add si,linksize ; and link info jmp short pdrcvr8 ; keep looking pdrcvr11:pop ax pop bx pop si pop ds popf ret ; yes, quit pdrcvr1:pushf cli push ds ; First upcall, provide buffer ptr push dx ; return buffer in ES:SI push cx mov di,DGROUP ; get local addressibility mov ds,di mov es,di ; packet buffer is in same group mov di,_pktbuf_wrote ; where last write occurred or di,di ; NULL? jz pdrcvr4 ; z = yes, write nothing mov dl,100 ; retry counter, breaks endless loops cmp [di].flag,1 ; is this link free? je pdrcvr5 ; e = yes, use it pdrcvr2:add di,[di].count ; point at next link (add count and add di,linksize ; link overhead) dec dl ; loop breaker count down or dl,dl jz pdrcvr4 ; z = in an endless loop, exit cmp [di].flag,1 ; is this link free (1)? je pdrcvr5 ; e = yes, setup storage cmp di,_pktbuf_wrote ; have we come full circle? jne pdrcvr2 ; ne = no, keep looking pdrcvr4:pop cx pop dx pop ds ; failure or buffer not available (0) xor ax,ax ; return what we received in ax xor di,di ; return ES:DI as null to reject mov es,di popf ret ; this link is free pdrcvr5:cmp cx,ETH_MSS+40+12 +20 ; LARGEST PACKET WE ACCEPT ja pdrcvr4 ; a = too large, decline it add cx,2 ; defense for 8/16 bit xfr mistakes mov ax,[di].count ; length of available data space cmp ax,cx ; cx is incoming size, enough space? jl pdrcvr2 ; l = no, go to next link mov [di].flag,4 ; mark link flag as being alloc'd (4) mov dh,_pktwnum ; write pkt sequencer number mov [di].bufnum,dh ; store in buffer, permits out of inc _pktwnum ; temporal order deliveries mov _pktbuf_wrote,di ; remember where we wrote last sub ax,cx ; allocated minus incoming packet cmp ax,60+linksize ; enough for new link and miminal pkt? jl pdrcvr6 ; l = not enough for next pkt mov [di].count,cx ; update space really used push di ; save this link pointer add di,linksize ; plus current link info add di,cx ; plus space used = new link point sub ax,linksize ; available minus new link info mov [di].flag,1 ; mark new link as free (1) mov [di].count,ax ; size of new free data area pop di ; return to current link pdrcvr6:add di,linksize ; point at data portion pdrcvr7:xor ax,ax ; return what we received in ax pop cx pop dx pop ds ; ES:DI is the pkt buffer address popf ; CX is size of requested buffer ret pdrcvr endp ; Begin Novell ODI support routines ; Note that while we use Ethernet_II (6 dest, 6 source, 2 TYPE bytes) to/from ; internal consumers the frame format to/from ODI is in the hands of ODI. ; Hopefully this will permit TCP/IP operation over all supported frame types. ; ARP/RARP packets are sized to the frame in use. ; ; Check for LSL presence, and if present then get entry points. ; Returns carry set if failure, else carry clear. ; This procedure is closely modeled upon the Novell example. odichk proc near cmp useodi,0 ; already inited? je odichk0 ; e = no clc ret odichk0:push es mov ah,getintv ; get LSL via multiplexer interrupt mov al,2fh ; vector 2fh int dos ; to es:bx mov ax,es mov cx,ax or cx,bx ; check if vector exists jnz odichk1 ; nz = yes pop es stc ret odichk1:mov ax,0c000h ; look at multiplexer slots c0 et seq push si push di odichk2:push ax int 2fh cmp al,0ffh ; is slot in use? pop ax je odichk4 ; e = yes, check for LSL being there odichk3:inc ah ; next slot or ah,ah ; wrapped? jnz odichk2 ; nz = no, keep looking pop di pop si pop es stc ; not found, fail ret odichk4:mov di,si ; es:si should point to "LINKSUP$" mov si,offset DGROUP:lslsig ; expected signature mov cx,lslsiglen ; length repe cmpsb ; check for signature jne odichk3 ; ne = no match, try next Int 2fh slot mov word ptr lslinit,bx ; found entry, save init entry point mov ax,es ; returned in es:bx mov word ptr lslinit+2,ax mov ax,ds mov es,ax ; get LSL main support/service addrs mov si,offset DGROUP:lslsupport ; address of LSL entry point array mov bx,2 ; request support/service entry points ; fills in far addresses of lslsupport and lslservice routines call lslinit ; call LSL initialization routine pop di pop si pop es clc ; success ret odichk endp ; Bind a protocol TYPE to an ODI virtual board. ; Enter with TYPE (big endian/network order) in AX. ; Packet reception begins immediately upon a successful bind. ; Uses NET.CFG if information is available. ; Obtain StackID (our ident to the LSL), ProtID (ident of LSL's decoder), ; and boardnumber (the logical board), then bind to start reception. Do for ; one of our protocols. ; Returns PD handle (TYPE) in AX and carry clear upon success, else carry set. odibind proc near push ax push bx push si push di push es mov bx,DGROUP mov es,bx cmp ax,ip_type ; IP, 0x0008h? jne odibind1 ; ne = no mov ax,offset DGROUP:ip_string ; put IP string in request mov bx,offset ip_rcvr ; set address of receiver esr mov di,offset DGROUP:ip_stackid ; set address of stackid struc jmp short odibind3 odibind1:cmp ax,arp_type ; ARP, 0x0608? jne odibind2 ; ne = no mov ax,offset DGROUP:arp_string mov bx,offset arp_rcvr mov di,offset DGROUP:arp_stackid jmp short odibind3 odibind2:cmp ax,rarp_type ; RARP, 0x3580? je odibind2a ; e = yes jmp odibindx ; ne = no, fail odibind2a:mov ax,offset DGROUP:rarp_string mov bx,offset rarp_rcvr mov di,offset DGROUP:rarp_stackid odibind3:mov word ptr registerstk.StackNamePtr,ax ; insert ptr to string mov word ptr registerstk.StackReceiveHandler,bx ; setup esr addr ; Note: to use Prescan or Default registrations delete StackNamePtr & StackID. ; StackID is not used with these latter methods, and their reception begins ; at registration rather than at bind (so this area would be redesigned). mov bx,PROTSUP_REGISTER_STACK ; register the protocol by name mov si,offset DGROUP:registerstk ; registration form pointer push di ; save ptr to xxx_stackid storage call lslsupport ; call LSL with the address in es:si pop di jz odibind3a ; z = success jmp odibindx ; nz = failure odibind3a:mov [di].pstack,bx ; save returned StackID (LSL's handle ; for our protocol stack) cmp readnetcfg,0 ; have read NET.CFG for BIND info? jne odibind4 ; ne = yes mov useboard,-1 ; clear board-to-use word call getbind ; find Kermit's bind board in NET.CFG inc readnetcfg ; say have read the file cmp word ptr bdname,256*'#'+2 ; is board name #<digit>? jne odibind4 ; ne = no, assume regular driver name mov al,bdname+2 ; get ascii digit sub al,'1' ; remove ascii bias (external=1 based) xor ah,ah ; but we are zero based internally cmp al,8 ; arbitrary limit of 8 boards ja odibind4 ; a = out of range, ignore value mov useboard,ax ; and make this the board number mov bdname,0 ; and don't use bdname as a name odibind4:mov [di].pboard,0 ; assume board zero to start loop mov ax,useboard ; board to be used, if any or ax,ax ; boards 0 and up are legal jl odibind5 ; l = no board found yet, search mov [di].pboard,ax ; specify board, get ProtID odibind5:mov bx,PROTSUP_GET_MLID_CTL_ENTRY ; get MLID control entry mov ax,[di].pboard ; for this board push di call lslsupport ; call LSL for the address to es:si pop di mov word ptr mlidcont,si mov word ptr mlidcont+2,es ; MLID control routine jz odibind7 ; z=success, have a board to work with cmp ax,LSLERR_NO_MORE_ITEMS ; out of items? je odibind5a ; e = yes, no more boards cmp ax,LSLERR_ITEM_NOT_PRESENT ; other boards may exist? je odibind7 ; e = yes odibind5a:jmp odibindx ; fail odibind7:mov bx,PROTSUP_GET_PID_PROTNUM_MLIDNUM ; get ProtID from StackID mov ax,[di].pstack ; StackID mov cx,[di].pboard ; and assumed board number mov si,DGROUP mov es,si ; set es:di to the ProtID buffer lea si,[di].pprotid ; in our storage slot per protocol push di ; call lslsupport ; ask LSL for the ProtID string pop di ; to that 6-byte buffer jz odibind9 ; z = success, found a recognizer cmp useboard,0 ; has a board been pre-identified? jge odibind5a ; ge = yes, so the matchup failed inc [di].pboard ; next board jmp short odibind5 ; keep looking for a board odibind9:mov bx,GET_MLID_CONFIGURATION ; get MLID config ptr to es:si mov ax,[di].pboard call mlidcont ; call MLID control routine jnz odibindx ; nz = failure cmp bdname,0 ; was a board name bound via BIND? je odibin10 ; e = no, don't check on it push es ; save pointer to MLID config table push di push si les di,es:[si].MCardShortName ; get short name of this board lea si,bdname ; desired board name string mov cl,bdname ; length of desired board name inc cl ; include length byte xor ch,ch cld repe cmpsb ; compare len,string for both pop si pop di pop es je odibin10 ; e = found desired board inc [di].pboard ; try next board jmp short odibind5 ; keep looking for the desired board odibin10:mov ax,[di].pboard ; get current board number mov useboard,ax ; remember for next protocol mov bx,es:[si].MFrameID ; frame ident, for get_hwd call get_hwd ; get hardware specifics or bx,bx ; returned _MAC_len, if any jnz odibin11 ; nz = found match mov bx,6 ; else default to 6 bytes odibin11:push es push si ; save config pointer lea si,es:[si].MNodeAddress ; point to address in config struct push ds ; save ds push di mov di,offset DGROUP:_eth_addr; where our MAC address is stored mov ax,ds mov cx,es mov es,ax mov ds,cx cld mov cx,bx ; MAC address length, bytes rep movsb ; copy MAC address to global array pop di pop ds pop si ; recover configuration table pointer pop es mov tells_len,0 ; presume no lookahead data length test es:[si].MFlags,Len_Info ; capas bit for length provided (new) jz odibin12 ; z = does not provide inc tells_len ; say provides length odibin12:mov bx,PROTSUP_BIND_STACK_TO_MLID ; Bind stack to MLID mov ax,[di].pstack ; StackID mov cx,[di].pboard ; board number call lslsupport ; bind our protocol stack to board jnz odibindx ; nz = failure pop es ; received packets can interrupt now pop di pop si pop bx pop ax clc ret odibindx:pop es pop di pop si pop bx pop ax stc ; say failure ret odibind endp ; Worker for odibind. Find NET.CFG, extract name of board driver from pair of ; lines reading as below (Protocol must be in column 1, bind must be indented) ; Protocol Kermit Kermit's main section header ; bind <board_driver_name> indented, without the <> signs ;or ; Protocol Kermit ; bind #<digit> selects DOS driver load order (from 1) ; ; Examples - ; Protocol Kermit ; bind exos ;or ; Protocol Kermit ; bind #2 ; and elsewhere there is the board driver section: ; Link Driver exos ; ; If found put the board driver name in array bdname, as length byte, string, ; then a null. If not found make length byte bdname be zero. We treat NET.CFG ; as case insensitive. ; Unless we use the special Kermit section then LSL will assign to us the ; first board loaded by DOS supporting the frame kind of our protocol. ; Link Driver section line "Protocol name type frame" simply associates a ; frame kind with the name and type, but not with a board. L.D. section line ; frame <frame kind> attaches that frame kind to the board, if it fits. ; Kermit uses "name" in the above line to pinpoint a protocol, not a board. getbind proc near mov bdname,0 ; clear board name length push ds mov bx,GENSERV_GET_NETCFG_PATH ; get fully formed NET.CFG name call lslservice ; from LSL general services to ds:dx jz getbin1 ; z = success pop ds ; fail ret getbin1:mov ah,fopen ; open file NET.CFG mov al,40h ; for reading, deny none int dos ; returns file handle in ax pop ds mov temp,ax ; save handle for getbyte jnc getbin2 ; nc = success ret ; carry set for failure getbin2:mov bx,1 ; subscript, at start of a line getbin3:call getbyte ; read a byte, uppercased jnc getbin4 ; nc = success ret ; c = end of file getbin4:cmp protword[bx],al ; compare to "PROTOCOL" jne getbin5 ; ne = failure, scan for end of line inc bx cmp bl,protword ; length, matched all bytes? jbe getbin3 ; be = no, match more jmp short getbin6 ; ae = yes, next phrase ret ; fail out getbin5:cmp al,LF ; end of a line? je getbin2 ; e = yes, scan for PROTOCOL again call getbyte jnc getbin5 ; keep consuming line material ret ; fail out at end of file ; Short Name following "PROTOCOL" getbin6:call getbyte ; get separator char, discard jnc getbin7 ret ; c = eof getbin7:call getbyte ; read short name of protocol jnc getbin7a ; nc = text ret ; return on eof getbin7a:cmp al,' ' ; white space? jbe getbin7 ; be = yes, stay in this state mov bx,1 ; subscript getbin8:cmp psname[bx],al ; compare to our protocol short name jne getbin5 ; ne = failure, scan for end of line cmp bl,psname ; matched all bytes? jae getbin9 ; ae = yes, next phrase inc bx call getbyte ; get next byte to match jnc getbin8 ; nc = not eof yet ret getbin9:call getbyte ; go to next line, enforce whitespace jc getbin20 ; c = eof cmp al,LF ; end of a line? jne getbin9 ; ne = no, scan for end of line call getbyte ; look for whitespace jc getbin20 ; c = eof cmp al,' ' ; required whitespace? ja getbin5 ; a = no, start over getbin10:call getbyte ; look for keyword "BIND" jc getbin20 cmp al,' ' ; white space? jbe getbin10 ; be = yes, stay in this state mov bx,1 ; subscript getbin11:cmp bindword[bx],al ; compare to "BIND" jne getbin5 ; ne = failure, start over cmp bl,bindword ; matched all bytes? jae getbin12 ; ae = yes, next phrase call getbyte jc getbin20 ; c = eof inc bx jmp short getbin11 ; keep reading getbin12:call getbyte ; skip white space before board name jc getbin20 cmp al,' ' ; white space? jbe getbin12 ; be = yes, skip it getbin13:mov bl,bdname ; board name, length byte, starts at 0 xor bh,bh inc bl mov bdname,bl ; update length of board driver name xor ah,ah ; get a null mov word ptr bdname[bx],ax ; store as board short name,null cmp bx,15 ; legal limit on short name? jbe getbin14 ; be = ok mov bdname,ah ; illegal, clear board name length jmp getbin15 ; and quit getbin14:call getbyte jc getbin20 ; reached eof, is ok cmp al,' ' ; usable text? ja getbin13 ; a = yes, else stop storing name getbin15:call getbyte ; read to eof so file is closed jnc getbin15 ; nc = got a char getbin20:ret getbind endp ; Worker for getbind. Delivers one byte per call from NET.CFG, upper cased. ; Returns carry set and NET.CFG file closed at end of file. ; Temp has NET.CFG file handle, tempb is our one byte buffer for disk i/o. getbyte proc near mov dx,offset tempb ; ds:dx points to start of buffer mov ah,fread ; read from file to buffer mov cx,1 ; this many bytes push bx mov bx,temp ; get file handle int dos pop bx jc getbyt2 ; c = failure cmp ax,1 ; got the single byte? jb getbyt2 ; b = no, failure mov al,tempb ; return read byte cmp al,'z' ; in lower case range? ja getbyt1 ; a = no cmp al,'a' ; in lower case range? jb getbyt1 ; b = no and al,not 20h ; lower to upper case getbyt1:clc ; carry clear for success ret ; return char in AL getbyt2:push bx mov bx,temp ; file handle mov ah,fclose ; close the file int dos pop bx stc ; say EOF or other failure ret getbyte endp ; Worker for odibind. ; Enter with BX holding Novell frame type from the MLID configuration table. ; Set _arp_hardware and _MAC_len and return BX holding _MAC_len value, else ; if frame is not supported return BX = 0. These two values are needed by the ; ARP functions. This list searching method is to accomodate the ever ; expanding quantity of frame types appearing with ODI; we deal with those we ; understand (sic). get_hwd proc near push es push di mov ax,DGROUP mov es,ax mov al,bl ; get frame value (MLID config) xor bx,bx ; prepare no-match return value mov di,offset frame_type ; list to search mov cx,num_frames ; number of elements in the list cld repne scasb ; byte search jne get_hwd1 ; ne = no match, fail sub di,offset frame_type+1 ; make di be an index along the list mov al,hardware_type[di] ; ARP/RARP hardware type ident xor ah,ah xchg ah,al ; put in network order (big endian) mov _arp_hardware,ax ; hardware type for ARP/RARP pkts mov bl,frame_adlen[di] ; array of MAC lengths for frame types xor bh,bh mov _MAC_len,bx ; save MAC address length (1..6 bytes) get_hwd1:pop di pop es ret ; return _MAC_len in BX get_hwd endp ; Unbind a protocol TYPE from an ODI virtual board ; Enter with protocol TYPE (net order) in AX, return carry set if failure. ; The TYPE is used as our handle to the application. ; Prescan and Default methods call lslsupport with the board number in AX ; rather than StackID and use matching PROTSUP_DEREGISTER_* code. odiunbind proc near cmp ax,ip_type ; IP, 0x0008h? jne odiunb1 ; ne = no mov ax,ip_stackid.pstack ; StackID jmp short odiunb3 odiunb1:cmp ax,arp_type ; ARP, 0x0608? jne odiunb2 ; ne = no mov ax,arp_stackid.pstack jmp short odiunb3 odiunb2:cmp ax,rarp_type ; RARP, 0x3580? jne odiunb4 ; ne = no mov ax,rarp_stackid.pstack odiunb3:mov bx,PROTSUP_DEREGISTER_STACK ; deregister stack (StackID in AX) call lslsupport ; stops reception now jnz odiunb4 ; nz = failure clc ; success ret odiunb4:stc ; failure ret odiunbind endp ; ODI receive interrupt handler, for use only by the LSL. ; Called with DS:DI pointing to lookahead structure, interrupts are off. ; Returns ES:SI pointing at ECB, AX = 0 if we want pkt, AX = 8001h if decline. ; There are three of these, one each for IP, ARP, and RARP. All have the ; same calling convention and all jump to odircv to do the real work. ; The length of the arriving packet is available if the MLID supports the ; new (mid-May 1992) capability, our "tells_len"; otherwise we make an ; intelligent guess based on the protocol header. These entry points can be ; called multiple times before receive-completion, and likely will be, so we ; use several ecb's to accept requests. ip_rcvr proc far push bx push cx push di push ds mov cx,ds ; DS:DI from LSL mov es,cx ; use ES for LSL items mov ax,DGROUP ; set DS to our data segment mov ds,ax push es push si cmp tells_len,0 ; have data length available? je ip_rec1 ; e = no les si,es:[di].DataLookAheadDataSize ; ptr to what it says mov cx,word ptr es:[si] ; get length of data field add cx,4 ; for overzealous board transfers pop si pop es jmp far ptr odircv ip_rec1:les si,es:[di].LookAheadPtr ; point at data lookahead ptr mov cx,word ptr es:[si+2] ; IP pkt header, length word cmp byte ptr es:[si],45h ; validate IP pkt kind (ver/hlen)? pop si pop es jne ip_rcvr1 ; ne = invalid, decline xchg ch,cl ; net to local order add cx,14+8 ; our MAC level addressing + 8 safety ip_rec2:mov ax,ip_stackid.pstack ; StackID for ecb structure mov rcvtype,ip_type ; store protocol TYPE int cmp cx,ETH_MSS+40+12+20 ; LARGEST ACCEPTABLE PKT jbe odircv ; be = acceptable length ip_rcvr1:add pstats.PIgnoredRxPackets,1 ; update ODI statistics counter adc pstats.PIgnoredRxPackets+2,0 mov ax,LSLERR_OUT_OF_RESOURCES ; decline the packet or ax,ax ; set Z flag to match AX pop ds pop di pop cx pop bx ret ip_rcvr endp ; RARP protocol receive service routine, similar to ip_rcvr. rarp_rcvr proc far push bx push cx push di push ds mov cx,ds ; DS:SI from LSL mov es,cx mov ax,DGROUP ; set DS to our data segment mov ds,ax mov ax,arp_stackid.pstack ; StackID for ecb structure mov rcvtype,rarp_type ; store protocol TYPE int jmp short arp_common ; do ARP/RARP common code rarp_rcvr endp ; ARP protocol receive service routine, similar to ip_rcvr. arp_rcvr proc far push bx push cx push di push ds mov cx,ds ; DS:SI from LSL mov es,cx mov ax,DGROUP ; set DS to our data segment mov ds,ax mov ax,arp_stackid.pstack ; StackID for ecb structure mov rcvtype,arp_type ; store protocol TYPE int arp_common: ; common code for ARP/RARP push es push si cmp tells_len,0 ; have data length available? je arp_com1 ; e = no les si,es:[di].DataLookAheadDataSize ; ptr to what it says mov cx,word ptr es:[si] ; get length of data field add cx,4 ; for overzealous board transfers pop si pop es jmp short odircv arp_com1:les si,es:[di].LookAheadPtr ; point at lookahead ptr for Data mov cx,word ptr es:[si+4] ; ARP/RARP pkt header, length bytes add cl,ch ; add HA and IP address lengths xor ch,ch add cl,cl ; for host and target adc ch,0 add cx,8 ; plus ARP/RARP main header cmp word ptr es:[si+2],ip_type ; ARP/RARP Protocol type of IP? pop si pop es jne ip_rcvr1 ; ne = invalid, decline ; fall through to odircv arp_rcvr endp ; General worker for ip_rcvr, arp_rcvr, rarp_rcvr. These are invoked by the ; LSL when their kind of packet arrives. This module creates the ECB and ; dispatches it to the LSL. Operating at LSL interrupt level. ; ES:DI is ptr to ODI Lookahead structure, DS is our data seg. ; AX is stackid for invoked protocol kind, CX is (guessed) pkt length overall. ; Rcvtype is the current invoked protocol TYPE (0008h is IP etc). ; When done store in the ecb's protocolws array: ; dw protocol TYPE (0008h for IP etc) ; dw subscript of this ecbr item (for use by odircmp) ; dw <unused>,<unused> ; Return ES:SI as pointer to a free ecb and AX = 0 to accept pkt, else ; return AX = 8001h to decline pkt (and to ignore ES:SI). Set Z flag to ; match AX value. odircv proc far add pstats.PtotalRxPackets,1 ; update ODI statistics counter adc pstats.PtotalRxPackets+2,0 push ax push cx mov cx,ecbr_qty ; number of receive ecb's xor bx,bx ; find a free ecb for this packet odircv8:cmp ecbr_busy[bx],0 ; is this ECB free? jne odircv9 ; ne = no, try next mov ecbr_num,bx ; remember index for end of proc mov ax,size ecbstruct ; size of an ecb mul bl ; times this subscript add ax,offset DGROUP:ecbr ; start of receive ecbs mov bx,ax ; offset of free ecb pop cx pop ax jmp short odircv2 ; use ds:[bx] for address of ecb odircv9:inc bx ; next byte in busy array loop odircv8 pop cx ; failed to find a free ecbr pop ax odircv1:add pstats.PIgnoredRxPackets,1 ; update ODI statistics counter adc pstats.PIgnoredRxPackets+2,0 mov ax,LSLERR_OUT_OF_RESOURCES ; decline the packet or ax,ax ; set Z flag for ODI pop ds pop di pop cx pop bx ret ; ds:[bx] is ptr to a free ecbr odircv2:mov [bx].stackid,ax ; StackID from odircv entry points mov ax,es:[di].LBoardNum ; boardnum from ProtocolID lookahead mov [bx].boardnum,ax ; store in ecbr mov ax,rcvtype ; get TYPE from odircv entry points mov word ptr [bx].protocolws,ax ; save TYPE for odircmp mov ax,ecbr_num ; ecbr index mov word ptr [bx].protocolws+2,ax ; save index for odircmp cmp cx,64 ; min packet for Ethernet + 4 spare jae odircv3 ; ae = no padding needed here mov cx,64 ; padded min pkt plus 4 spare bytes odircv3:push bx ; get a buffer of length CX bytes xor ax,ax ; set AX = 0 for PD "get buf" call call pdrcvr ; use PD buffer allocator code pop bx ; ES:DI = buffer pointer, CX = length mov ax,es or ax,di ; check for refused pkt (es:di = NULL) jz odircv1 ; z = pkt refused (no buffer space) add di,6+6+2 ; skip our MAC header for ecb use sub cx,6+6+2 ; less same length for MLID mov [bx].frag1addr,di ; offset of buffer which MLID sees mov ax,es mov [bx].frag1addr+2,ax ; seg of buffer mov [bx].datalen,cx ; length of buffer for MLID/LSL use mov [bx].frag1len,cx ; ditto mov ax,DGROUP ; segment of our ecb's mov es,ax mov si,bx ; return ES:SI pointing to ECB mov bx,ecbr_num ; get ecbr index mov ecbr_busy[bx],1 ; mark this ecbr as busy pop ds pop di pop cx pop bx xor ax,ax ; return AX = 0 to accept ret odircv endp ; ODI receive-complete call-back routine for use only by the LSL. ; Enter with ES:SI pointing at ECB, interrupts are off. ; Returns nothing. ; There is no guarantee that this routine will be called in the sequence ; which packets arrived, so we carry the bookkeeping in the delivered ECB: ; TYPE is for Ethernet_II struct results, ecbr_busy is don't touch interlock. ; Note that we have to construct our own "destination" MAC address. ; es:[si].status is 0 (success), 8006h (buffer overrun), 8007h (canceled). ; StackID field is from LSL, and it's 0ffffh if using Prescan, and undefined ; if using Default. The manual says LSL, but not MLID, calls are ok in here. odircmp proc far push ds push ax push bx push cx mov ax,DGROUP mov ds,ax ; set ds to our data segment cmp es:[si].frag1addr+2,0 ; segment of pkt being confirmed je odircmp5 ; e = illegal, ignore this call cmp es:[si].status,0 ; check ECB status for failure je odircmp1 ; e = success mov es:[si].protocolws,0 ; write TYPE of 0 to permit queueing odircmp1:push di ; put dest,src,TYPE into pkt buffer push es push si ; save ecbr's si mov cl,byte ptr es:[si].driverws ; kind of destination, from LSL mov di,es:[si].frag1addr ; start of our pkt buffer + 6+6+2 sub di,6+6+2 ; back to start, for our MAC header push ds ; WATCH this, presumes ES == DS! pop es ; set ES to DS (where pkt buffer is) mov si,offset DGROUP:_eth_addr ; our hardware address cmp cl,ECB_BROADCAST ; a broadcast? jne odircmp2 ; ne = no, use our address mov si,offset DGROUP:bcast ; fill with all 1's odircmp2:mov cx,3 ; 6 byte addresses to our application cld rep movsw ; store source address in pkt buffer pop si ; recover ecb si push si ; save it again mov ax,es:[si].protocolws ; get TYPE, from odircv lea si,es:[si].immaddr ; offset to MAC address of sender mov cx,3 ; three words worth, garbage and all rep movsw ; copy to packet buffer stosw ; and write TYPE to packet buffer pop si pop es pop di mov cx,es:[si].datalen ; length of data field from ecb add cx,6+6+2 ; plus space for dest,src,TYPE push es ; save ecb's es:si push si mov si,es:[si].frag1addr ; offset of pkt being confirmed sub si,6+6+2 ; adj to beginning, for our MAC header mov ax,1 ; set AX = 1 for buffer done call call pdrcvr ; do post processing of buffer pop si pop es odircmp5:xor ax,ax cmp es:[si].frag1addr+2,ax ; segment of pkt being confirmed je odircmp6 ; e = illegal, ignore this call mov es:[si].frag1addr+2,ax ; clear pkt buffer pointer (seg) mov es:[si].protocolws,ax ; clear packet TYPE mov bx,es:[si].protocolws+2 ; point to ecb index mov ecbr_busy[bx],al ; say this ecb is free now odircmp6:pop cx pop bx pop ax pop ds ret odircmp endp ; ODI transmission routine ; Enter with ds:si pointing at full Ethernet_II packet, cx = length (bytes) ; Once sent the ecb belongs to ODI until the xmt-complete routine is called. odixmt proc near push si push di push es mov ax,ds mov es,ax cmp ecbx_busy,0 ; is this transmitter ecb free? je odixmt8 ; e = yes odixmt7:stc ; say failure jmp odixmt6 ; abandon odixmt8:mov ax,cx ; overall Ethernet_II length sub ax,6+6+2 ; omit our MAC header jc odixmt6 ; c = failure, abandon mov ecbx.datalen,ax ; setup ECB overall data mov ecbx.frag1len,ax ; and fragment length mov cx,3 ; three words of dest MAC address mov di,offset DGROUP:ecbx.immaddr ; destination address in ecb rep movsw ; copy destination MAC address add si,6 ; skip source Ethernet address lodsw ; get protocol TYPE, move it to AX mov ecbx.frag1addr,si ; offset of packet data mov si,ds mov ecbx.frag1addr+2,si ; segment of packet data ; Note: Prescan and Default methods use Raw Send: put 0ffffh in StackID ; and include the full frame header in the data field. Check MLID ; configuration word ModeFlags, MRawSendBit, for Raw Send capability. cmp ax,ip_type ; IP, 0x0008h? jne odixmt1 ; ne = no mov si,offset DGROUP:ip_stackid jmp short odixmt3 odixmt1:cmp ax,arp_type ; ARP, 0x0608? jne odixmt2 ; ne = no mov si,offset DGROUP:arp_stackid jmp short odixmt3 odixmt2:cmp ax,rarp_type ; RARP, 0x3580? jne odixmt7 ; ne = error, do not send mov si,offset DGROUP:rarp_stackid odixmt3:mov cx,5 ; stackid, protid, boardnum mov di,offset DGROUP:ecbx.stackid ; get stack ident area rep movsw ; copy to ecbx mov ecbx_busy,1 ; set ECBx busy flag to busy state add pstats.PtotalTxPackets,1 ; update ODI statistics counter adc pstats.PtotalTxPackets+2,0 mov si,offset DGROUP:ecbx ; set es:si to ECB mov bx,PROTSUP_SEND_PACKET ; send it call lslsupport ; call LSL with ecbx ptr in es:si clc ; success so far, ints are still off odixmt6:pop es pop di pop si ret odixmt endp ; ODI transmission-complete processor, for use only by the LSL. ; Returns nothing. Unlocks ECB busy flag. odixcmp proc far push ds push ax mov ax,DGROUP ; set addressibility mov ds,ax mov ecbx_busy,0 ; set ECB busy flag to not-busy pop ax pop ds ret odixcmp endp ; ODI Protocol (that's us) Control routine, required, called from outside. ; In principle we should have one of these for each protocol (IP, ARP, RARP) ; by putting a different StackControlHandler address in registerstk, but I ; doubt that anyone is that interested in such detailed counts. ; Return AX clear, Z flag set, and ES:SI as table pointer if success, else ; return AX with error code and Z flag clear. pcontrol proc far cmp bx,GET_STACK_CONFIGURATION ; get stack configuration? jne pcont1 ; ne = no mov si,DGROUP mov es,si ; es:si points to configuration table mov si,offset DGROUP:pconfig; the table xor ax,ax ; set Z flag ret pcont1: cmp bx,GET_STACK_STATISTICS ; get stack statistics? jne pcont2 ; ne = no mov si,DGROUP mov es,si ; es:si points to statistics table mov si,offset DGROUP:pstats ; the table xor ax,ax ; set Z flag ret pcont2: mov ax,LSLERR_OUT_OF_RESOURCES ; other functions, report error or ax,ax ; clear Z flag ret pcontrol endp _TEXT ends end