162 lines
3 KiB
C
162 lines
3 KiB
C
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/*++
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Copyright (c) 1995 Microsoft Corporation
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Module Name:
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periodbc.c
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Abstract:
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Contains the work item handler periodic bcast
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Author:
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Stefan Solomon 07/20/1995
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Revision History:
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--*/
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#include "precomp.h"
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#pragma hdrstop
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/*++
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Function: IfPeriodicBcast
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Descr: called to initiate or continue (complete) a bcast
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if EnumHandle is NULL it is a start, else a continuation
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Remark: called with the interface lock held
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--*/
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VOID
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IfPeriodicBcast(PWORK_ITEM wip)
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{
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UCHAR ripsocket[2];
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USHORT pktlen;
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ULONG delay;
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PICB icbp;
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icbp = wip->icbp;
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#define EnumHandle wip->WorkItemSpecific.WIS_EnumRoutes.RtmEnumerationHandle
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if(icbp->IfStats.RipIfOperState != OPER_STATE_UP) {
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if(EnumHandle) {
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CloseEnumHandle(EnumHandle);
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}
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FreeWorkItem(wip);
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return;
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}
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PUTUSHORT2SHORT(ripsocket, IPX_RIP_SOCKET);
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// check if this is the start or the continuation of a periodic bcast
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if(EnumHandle == NULL) {
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// *** This is the start of a new broadcast ***
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// create an RTM enumeration handle
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if((EnumHandle = CreateBestRoutesEnumHandle()) == NULL) {
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SS_ASSERT(FALSE);
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FreeWorkItem(wip);
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return;
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}
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}
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else
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{
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// *** This is the continuation of a started broadcast ***
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// check if this was the last packet in the response
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GETSHORT2USHORT(&pktlen, wip->Packet + IPXH_LENGTH);
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if(pktlen < FULL_PACKET) {
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// we are done
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goto ResetPeriodicBcast;
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}
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// check the time stamp to determine if an interpacket gap is needed
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delay = (wip->TimeStamp + 55) - GetTickCount();
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if(delay < MAXULONG/2) {
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// have to wait this delay
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IfRefStartWiTimer(wip, delay);
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return;
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}
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}
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// make the gen response packet
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pktlen = MakeRipGenResponsePacket(wip,
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bcastnode,
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ripsocket);
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if(pktlen == EMPTY_PACKET) {
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// we are done
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goto ResetPeriodicBcast;
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}
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// send the bcast and increment the ref counter
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if(IfRefSendSubmit(wip) != NO_ERROR) {
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// can't send on this interface now -> requeue in timer and retry
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goto ResetPeriodicBcast;
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}
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return;
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ResetPeriodicBcast:
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// no more routes to advertise for this general response
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CloseEnumHandle(EnumHandle);
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EnumHandle = NULL;
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// enqueue for the bcast time in the timer queue
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IfRefStartWiTimer(wip, PERIODIC_UPDATE_INTERVAL_MILISECS(icbp));
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}
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/*++
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Function: IfPeriodicSendGenRequest
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Descr: called to send periodically a gen request on a wan line for
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a remote or local workstation dial. This is mainly to remain
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compatible with NT 3.51 rip router which requires a gen request
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in order to send its internal node (if client) or routing table
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if server.
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Remark: called with the interface lock held
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--*/
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VOID
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IfPeriodicGenRequest(PWORK_ITEM wip)
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{
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PICB icbp;
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icbp = wip->icbp;
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if(icbp->IfStats.RipIfOperState != OPER_STATE_UP) {
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FreeWorkItem(wip);
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return;
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}
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SendRipGenRequest(icbp);
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// enqueue the periodic send bcast in the timer queue
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IfRefStartWiTimer(wip, 60000);
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}
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