windows-nt/Source/XPSP1/NT/net/rras/ipx/rtrmgr/ifdbase.c

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/*++
Copyright (c) 1995 Microsoft Corporation
Module Name:
ifdbase.c
Abstract:
Functions to manipulate the interfaces database
Author:
Stefan Solomon 04/10/1995
Revision History:
--*/
#include "precomp.h"
#pragma hdrstop
#define ifhashindex(IfIndex) (IfIndex) % IF_HASH_TABLE_SIZE
// THESE FUNCTIONS ASSUME THE ROUTER MANAGER IS IN CRITICAL SECTION WHEN CALLED
//***
//
// Function: InitIfDB
//
// Descr:
//
//***
VOID
InitIfDB(VOID)
{
int i;
PLIST_ENTRY IfHtBucketp;
IfHtBucketp = IndexIfHt;
for(i=0; i<IF_HASH_TABLE_SIZE; i++, IfHtBucketp++) {
InitializeListHead(IfHtBucketp);
}
InitializeListHead(&IndexIfList);
}
//***
//
// Function: AddIfToDB
//
// Descr: Inserts a new interface in the Data Base
// The new if is inserted in the hash table of interface indices
// and the linked list of interfaces ordered by index
//
//***
VOID
AddIfToDB(PICB icbp)
{
int hv;
PLIST_ENTRY lep;
PICB list_icbp;
// insert in index hash table
hv = ifhashindex(icbp->InterfaceIndex);
InsertTailList(&IndexIfHt[hv], &icbp->IndexHtLinkage);
// insert in the list ordered by index
lep = IndexIfList.Flink;
while(lep != &IndexIfList)
{
list_icbp = CONTAINING_RECORD(lep, ICB, IndexListLinkage);
if (list_icbp->InterfaceIndex > icbp->InterfaceIndex) {
InsertTailList(lep, &icbp->IndexListLinkage);
return;
}
lep = list_icbp->IndexListLinkage.Flink;
}
InsertTailList(lep, &icbp->IndexListLinkage);
}
//***
//
// Function: RemoveIfFromDB
//
// Descr: Removes an interface from the interface data base
//
//***
VOID
RemoveIfFromDB(PICB icbp)
{
RemoveEntryList(&icbp->IndexHtLinkage);
RemoveEntryList(&icbp->IndexListLinkage);
}
PICB
GetInterfaceByIndex(ULONG IfIndex)
{
PICB icbp;
PLIST_ENTRY lep;
int hv;
hv = ifhashindex(IfIndex);
lep = IndexIfHt[hv].Flink;
while(lep != &IndexIfHt[hv])
{
icbp = CONTAINING_RECORD(lep, ICB, IndexHtLinkage);
if (icbp->InterfaceIndex == IfIndex) {
return icbp;
}
lep = icbp->IndexHtLinkage.Flink;
}
return NULL;
}
PICB
GetInterfaceByName(LPWSTR IfName)
{
PICB icbp;
PLIST_ENTRY lep;
lep = IndexIfList.Flink;
while(lep != &IndexIfList)
{
icbp = CONTAINING_RECORD(lep, ICB, IndexListLinkage);
if(!_wcsicmp(IfName, icbp->InterfaceNamep)) {
// found !
return icbp;
}
lep = icbp->IndexListLinkage.Flink;
}
return NULL;
}
/*++
Function: GetInterfaceByAdapterName
Descr: scans the list of interfaces looking for the adapter name
on dedicated interfaces
--*/
PICB
GetInterfaceByAdapterName(LPWSTR AdapterName)
{
PICB icbp;
PLIST_ENTRY lep;
lep = IndexIfList.Flink;
while(lep != &IndexIfList)
{
icbp = CONTAINING_RECORD(lep, ICB, IndexListLinkage);
if(icbp->MIBInterfaceType == IF_TYPE_LAN) {
if(!_wcsicmp(AdapterName, icbp->AdapterNamep)) {
// found !
return icbp;
}
}
lep = icbp->IndexListLinkage.Flink;
}
return NULL;
}
/*++
Function: GetInterfaceByAdptNameAndPktType
Descr: Iterates through all interfaces looking for one that matches the
given packet type and name.
[pmay] I added this because some interface bindings weren't taking place
during pnp because there would be multiple interfaces with the same
adapter name whose binding depended on the packet type.
--*/
PICB
GetInterfaceByAdptNameAndPktType(LPWSTR AdapterName, DWORD dwType)
{
PICB icbp;
PLIST_ENTRY lep;
lep = IndexIfList.Flink;
while(lep != &IndexIfList) {
icbp = CONTAINING_RECORD(lep, ICB, IndexListLinkage);
if(icbp->MIBInterfaceType == IF_TYPE_LAN) {
if((_wcsicmp(AdapterName, icbp->AdapterNamep) == 0) &&
((icbp->PacketType == AUTO_DETECT_PACKET_TYPE) || (icbp->PacketType == dwType)))
{
return icbp;
}
}
lep = icbp->IndexListLinkage.Flink;
}
return NULL;
}
/*++
Function: EnumerateFirstInterfaceIndex
Descr: returns the first interface index, if any
Note: called with database lock held
--*/
DWORD
EnumerateFirstInterfaceIndex(PULONG InterfaceIndexp)
{
PICB icbp;
if(!IsListEmpty(&IndexIfList)) {
icbp = CONTAINING_RECORD(IndexIfList.Flink, ICB, IndexListLinkage);
*InterfaceIndexp = icbp->InterfaceIndex;
return NO_ERROR;
}
else
{
return ERROR_NO_MORE_ITEMS;
}
}
/*++
Function: EnumerateNextInterfaceIndex
Descr: returns next if index in the database
Descr: called with database lock held
--*/
DWORD
EnumerateNextInterfaceIndex(PULONG InterfaceIndexp)
{
PLIST_ENTRY lep;
PICB icbp;
// scan the index if list until we find the next if index
lep = IndexIfList.Flink;
while(lep != &IndexIfList)
{
icbp = CONTAINING_RECORD(lep, ICB, IndexListLinkage);
if (icbp->InterfaceIndex > *InterfaceIndexp) {
*InterfaceIndexp = icbp->InterfaceIndex;
return NO_ERROR;
}
lep = lep->Flink;
}
return ERROR_NO_MORE_ITEMS;
}