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[TCPIP] Map 127.x.x.x addresses to the loopback address

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- Identify 127.x.x.x addresses as on-link addresses.
- Modify the neighbor cache to map all 127.x.x.x addresses to the loopback address (127.0.0.1).
- Create a single entry for all 127.x.x.x addresses instead of one entry per address. This entry belongs to the loopback address.

CORE-7484
This commit is contained in:
Eric Kohl
2026-03-14 16:01:31 +01:00
parent 616ffdda0f
commit 606d22d6c0
2 changed files with 36 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/network/tcpip/ip/network/interface.c
+17 -4
View File
@@ -218,6 +218,18 @@ PIP_INTERFACE GetDefaultInterface(VOID)
return Loopback;
}
BOOLEAN
HasLoopbackPrefix(
PIP_ADDRESS Address,
PIP_ADDRESS Prefix)
{
if (((Address->Address.IPv4Address & LOOPBACK_ADDRMASK_IPv4) == (LOOPBACK_ADDRESS_IPv4 & LOOPBACK_ADDRMASK_IPv4)) &&
(Prefix->Address.IPv4Address == LOOPBACK_ADDRESS_IPv4))
return TRUE;
return FALSE;
}
PIP_INTERFACE FindOnLinkInterface(PIP_ADDRESS Address)
/*
* FUNCTION: Checks all on-link prefixes to find out if an address is on-link
@@ -239,11 +251,12 @@ PIP_INTERFACE FindOnLinkInterface(PIP_ADDRESS Address)
TcpipAcquireSpinLock(&InterfaceListLock, &OldIrql);
ForEachInterface(CurrentIF) {
if (HasPrefix(Address, &CurrentIF->Unicast,
AddrCountPrefixBits(&CurrentIF->Netmask))) {
TcpipReleaseSpinLock(&InterfaceListLock, OldIrql);
if (HasLoopbackPrefix(Address, &CurrentIF->Unicast) ||
HasPrefix(Address, &CurrentIF->Unicast, AddrCountPrefixBits(&CurrentIF->Netmask)))
{
TcpipReleaseSpinLock(&InterfaceListLock, OldIrql);
return CurrentIF;
}
}
} EndFor(CurrentIF);
TcpipReleaseSpinLock(&InterfaceListLock, OldIrql);
drivers/network/tcpip/ip/network/neighbor.c
+19 -5
View File
@@ -296,6 +296,7 @@ PNEIGHBOR_CACHE_ENTRY NBAddNeighbor(
PNEIGHBOR_CACHE_ENTRY NCE;
ULONG HashValue;
KIRQL OldIrql;
IP_ADDRESS InternalAddress;
TI_DbgPrint
(DEBUG_NCACHE,
@@ -312,8 +313,14 @@ PNEIGHBOR_CACHE_ENTRY NBAddNeighbor(
return NULL;
}
RtlCopyMemory(&InternalAddress, Address, sizeof(*Address));
/* Map 127.x.x.x adresses to the loopback address (127.0.0.1) */
if ((InternalAddress.Address.IPv4Address & LOOPBACK_ADDRMASK_IPv4) == (LOOPBACK_ADDRESS_IPv4 & LOOPBACK_ADDRMASK_IPv4))
InternalAddress.Address.IPv4Address = LOOPBACK_ADDRESS_IPv4;
NCE->Interface = Interface;
NCE->Address = *Address;
NCE->Address = InternalAddress;
NCE->LinkAddressLength = LinkAddressLength;
NCE->LinkAddress = (PVOID)&NCE[1];
if( LinkAddress )
@@ -327,7 +334,7 @@ PNEIGHBOR_CACHE_ENTRY NBAddNeighbor(
TI_DbgPrint(MID_TRACE,("NCE: %x\n", NCE));
HashValue = *(PULONG)&Address->Address;
HashValue = *(PULONG)&InternalAddress.Address;
HashValue ^= HashValue >> 16;
HashValue ^= HashValue >> 8;
HashValue ^= HashValue >> 4;
@@ -433,10 +440,17 @@ PNEIGHBOR_CACHE_ENTRY NBLocateNeighbor(
UINT HashValue;
KIRQL OldIrql;
PIP_INTERFACE FirstInterface;
IP_ADDRESS InternalAddress;
TI_DbgPrint(DEBUG_NCACHE, ("Called. Address (0x%X).\n", Address));
HashValue = *(PULONG)&Address->Address;
RtlCopyMemory(&InternalAddress, Address, sizeof(*Address));
/* Map 127.x.x.x adresses to the loopback address (127.0.0.1) */
if ((InternalAddress.Address.IPv4Address & LOOPBACK_ADDRMASK_IPv4) == (LOOPBACK_ADDRESS_IPv4 & LOOPBACK_ADDRMASK_IPv4))
InternalAddress.Address.IPv4Address = LOOPBACK_ADDRESS_IPv4;
HashValue = *(PULONG)&InternalAddress.Address;;
HashValue ^= HashValue >> 16;
HashValue ^= HashValue >> 8;
HashValue ^= HashValue >> 4;
@@ -462,7 +476,7 @@ PNEIGHBOR_CACHE_ENTRY NBLocateNeighbor(
while (NCE != NULL)
{
if (NCE->Interface == Interface &&
AddrIsEqual(Address, &NCE->Address))
AddrIsEqual(&InternalAddress, &NCE->Address))
{
break;
}
@@ -482,7 +496,7 @@ PNEIGHBOR_CACHE_ENTRY NBLocateNeighbor(
NCE = NeighborCache[HashValue].Cache;
while (NCE != NULL)
{
if (AddrIsEqual(Address, &NCE->Address))
if (AddrIsEqual(&InternalAddress, &NCE->Address))
{
break;
}