lib/drivers/ip/network/interface.c

   1 /*
   2  * COPYRIGHT:   See COPYING in the top level directory
   3  * PROJECT:     ReactOS TCP/IP protocol driver
   4  * FILE:        tcpip/interface.c
   5  * PURPOSE:     Convenient abstraction for getting and setting information
   6  *              in IP_INTERFACE.
   7  * PROGRAMMERS: Art Yerkes
   8  * REVISIONS:
   9  *   CSH 01/08-2000 Created
  10  */
  11
  12 #include "precomp.h"
  13
  14 NTSTATUS GetInterfaceIPv4Address( PIP_INTERFACE Interface,
  15                                   ULONG TargetType,
  16                                   PULONG Address ) {
  17     switch( TargetType ) {
  18     case ADE_UNICAST:
  19         *Address = Interface->Unicast.Address.IPv4Address;
  20         break;
  21
  22     case ADE_ADDRMASK:
  23         *Address = Interface->Netmask.Address.IPv4Address;
  24         break;
  25
  26     case ADE_BROADCAST:
  27         *Address = Interface->Broadcast.Address.IPv4Address;
  28         break;
  29
  30     case ADE_POINTOPOINT:
  31         *Address = Interface->PointToPoint.Address.IPv4Address;
  32         break;
  33
  34     default:
  35         return STATUS_UNSUCCESSFUL;
  36     }
  37
  38     return STATUS_SUCCESS;
  39 }
  40
  41 UINT CountInterfaces() {
  42     ULONG Count = 0;
  43     KIRQL OldIrql;
  44     IF_LIST_ITER(CurrentIF);
  45
  46     TcpipAcquireSpinLock(&InterfaceListLock, &OldIrql);
  47
  48     ForEachInterface(CurrentIF) {
  49         Count++;
  50     } EndFor(CurrentIF);
  51
  52     TcpipReleaseSpinLock(&InterfaceListLock, OldIrql);
  53
  54     return Count;
  55 }
  56
  57 NTSTATUS GetInterfaceSpeed( PIP_INTERFACE Interface, PUINT Speed ) {
  58     PLAN_ADAPTER IF = (PLAN_ADAPTER)Interface->Context;
  59
  60     *Speed = IF->Speed;
  61
  62     return STATUS_SUCCESS;
  63 }
  64
  65 NTSTATUS GetInterfaceName( PIP_INTERFACE Interface,
  66                            PCHAR NameBuffer,
  67                            UINT Len ) {
  68     ULONG ResultSize = 0;
  69     NTSTATUS Status =
  70         RtlUnicodeToMultiByteN( NameBuffer,
  71                                 Len,
  72                                 &ResultSize,
  73                                 Interface->Name.Buffer,
  74                                 Interface->Name.Length );
  75
  76     if( NT_SUCCESS(Status) )
  77         NameBuffer[ResultSize] = 0;
  78     else
  79         NameBuffer[0] = 0;
  80
  81     return Status;
  82 }
  83
  84 PIP_INTERFACE AddrLocateInterface(
  85     PIP_ADDRESS MatchAddress)
  86 {
  87     KIRQL OldIrql;
  88     PIP_INTERFACE RetIF = NULL;
  89     IF_LIST_ITER(CurrentIF);
  90
  91     TcpipAcquireSpinLock(&InterfaceListLock, &OldIrql);
  92
  93     ForEachInterface(CurrentIF) {
  94         if( AddrIsEqual( &CurrentIF->Unicast, MatchAddress ) ||
  95             AddrIsEqual( &CurrentIF->Broadcast, MatchAddress ) ) {
  96             RetIF = CurrentIF;
  97             break;
  98         }
  99     } EndFor(CurrentIF);
 100
 101     TcpipReleaseSpinLock(&InterfaceListLock, OldIrql);
 102
 103     return RetIF;
 104 }
 105
 106 BOOLEAN HasPrefix(
 107     PIP_ADDRESS Address,
 108     PIP_ADDRESS Prefix,
 109     UINT Length)
 110 /*
 111  * FUNCTION: Determines wether an address has an given prefix
 112  * ARGUMENTS:
 113  *     Address = Pointer to address to use
 114  *     Prefix  = Pointer to prefix to check for
 115  *     Length  = Length of prefix
 116  * RETURNS:
 117  *     TRUE if the address has the prefix, FALSE if not
 118  * NOTES:
 119  *     The two addresses must be of the same type
 120  */
 121 {
 122     PUCHAR pAddress = (PUCHAR)&Address->Address;
 123     PUCHAR pPrefix  = (PUCHAR)&Prefix->Address;
 124
 125     TI_DbgPrint(DEBUG_ROUTER, ("Called. Address (0x%X)  Prefix (0x%X)  Length (%d).\n", Address, Prefix, Length));
 126
 127 #if 0
 128     TI_DbgPrint(DEBUG_ROUTER, ("Address (%s)  Prefix (%s).\n",
 129         A2S(Address), A2S(Prefix)));
 130 #endif
 131
 132     /* Check that initial integral bytes match */
 133     while (Length > 8) {
 134         if (*pAddress++ != *pPrefix++)
 135             return FALSE;
 136         Length -= 8;
 137     }
 138
 139     /* Check any remaining bits */
 140     if ((Length > 0) && ((*pAddress >> (8 - Length)) != (*pPrefix >> (8 - Length))))
 141         return FALSE;
 142
 143     return TRUE;
 144 }
 145
 146 static PIP_INTERFACE GetDefaultInterface(VOID)
 147 {
 148    KIRQL OldIrql;
 149    IF_LIST_ITER(CurrentIF);
 150
 151    TcpipAcquireSpinLock(&InterfaceListLock, &OldIrql);
 152    ForEachInterface(CurrentIF) {
 153       if (CurrentIF->Context) {
 154           TcpipReleaseSpinLock(&InterfaceListLock, OldIrql);
 155           return CurrentIF;
 156       }
 157    } EndFor(CurrentIF);
 158    TcpipReleaseSpinLock(&InterfaceListLock, OldIrql);
 159
 160    /* There are no physical interfaces on the system
 161     * so we must pick the loopback interface */
 162
 163    return Loopback;
 164 }
 165
 166 PIP_INTERFACE FindOnLinkInterface(PIP_ADDRESS Address)
 167 /*
 168  * FUNCTION: Checks all on-link prefixes to find out if an address is on-link
 169  * ARGUMENTS:
 170  *     Address = Pointer to address to check
 171  * RETURNS:
 172  *     Pointer to interface if address is on-link, NULL if not
 173  */
 174 {
 175     KIRQL OldIrql;
 176     IF_LIST_ITER(CurrentIF);
 177
 178     TI_DbgPrint(DEBUG_ROUTER, ("Called. Address (0x%X)\n", Address));
 179     TI_DbgPrint(DEBUG_ROUTER, ("Address (%s)\n", A2S(Address)));
 180
 181     if (AddrIsUnspecified(Address))
 182         return GetDefaultInterface();
 183
 184     TcpipAcquireSpinLock(&InterfaceListLock, &OldIrql);
 185
 186     ForEachInterface(CurrentIF) {
 187         if (HasPrefix(Address, &CurrentIF->Unicast,
 188                       AddrCountPrefixBits(&CurrentIF->Netmask))) {
 189             TcpipReleaseSpinLock(&InterfaceListLock, OldIrql);
 190             return CurrentIF;
 191         }
 192     } EndFor(CurrentIF);
 193
 194     TcpipReleaseSpinLock(&InterfaceListLock, OldIrql);
 195
 196     return NULL;
 197 }
 198
 199 NTSTATUS GetInterfaceConnectionStatus(PIP_INTERFACE Interface, PULONG Result)
 200 {
 201     NTSTATUS Status;
 202
 203     /* Query OID_GEN_MEDIA_CONNECT_STATUS for connection status information */
 204     Status = TcpipLanGetDwordOid(Interface, OID_GEN_MEDIA_CONNECT_STATUS, Result);
 205     if (!NT_SUCCESS(Status))
 206         return Status;
 207
 208     /* Translate the result into MIB_IF_OPER_STATUS_XXX */
 209     if (*Result == NdisMediaStateConnected)
 210     {
 211         /* Up and running */
 212         *Result = MIB_IF_OPER_STATUS_OPERATIONAL;
 213     }
 214     else
 215     {
 216         /* Down */
 217         *Result = MIB_IF_OPER_STATUS_DISCONNECTED;
 218     }
 219
 220     return STATUS_SUCCESS;
 221 }