reactos/drivers/lib/ip/network/arp.c

   1 /*
   2  * COPYRIGHT:   See COPYING in the top level directory
   3  * PROJECT:     ReactOS TCP/IP protocol driver
   4  * FILE:        datalink/arp.c
   5  * PURPOSE:     Address Resolution Protocol routines
   6  * PROGRAMMERS: Casper S. Hornstrup (chorns@users.sourceforge.net)
   7  * REVISIONS:
   8  *   CSH 01/08-2000 Created
   9  */
  10
  11 #include "precomp.h"
  12
  13 PNDIS_PACKET PrepareARPPacket(
  14     USHORT HardwareType,
  15     USHORT ProtocolType,
  16     UCHAR LinkAddressLength,
  17     UCHAR ProtoAddressLength,
  18     PVOID SenderLinkAddress,
  19     PVOID SenderProtoAddress,
  20     PVOID TargetLinkAddress,
  21     PVOID TargetProtoAddress,
  22     USHORT Opcode)
  23 /*
  24  * FUNCTION: Prepares an ARP packet
  25  * ARGUMENTS:
  26  *     HardwareType       = Hardware type (in network byte order)
  27  *     ProtocolType       = Protocol type (in network byte order)
  28  *     LinkAddressLength  = Length of link address fields
  29  *     ProtoAddressLength = Length of protocol address fields
  30  *     SenderLinkAddress  = Sender's link address
  31  *     SenderProtoAddress = Sender's protocol address
  32  *     TargetLinkAddress  = Target's link address (NULL if don't care)
  33  *     TargetProtoAddress = Target's protocol address
  34  *     Opcode             = ARP opcode (in network byte order)
  35  * RETURNS:
  36  *     Pointer to NDIS packet, NULL if there is not enough free resources
  37  */
  38 {
  39     PNDIS_PACKET NdisPacket;
  40     NDIS_STATUS NdisStatus;
  41     PARP_HEADER Header;
  42     PVOID DataBuffer;
  43     ULONG Size, Contig;
  44
  45     TI_DbgPrint(DEBUG_ARP, ("Called.\n"));
  46
  47     /* Prepare ARP packet */
  48     Size = MaxLLHeaderSize +
  49         sizeof(ARP_HEADER) +
  50         2 * LinkAddressLength + /* Hardware address length */
  51         2 * ProtoAddressLength; /* Protocol address length */
  52     Size = MAX(Size, MinLLFrameSize);
  53
  54     NdisStatus = AllocatePacketWithBuffer( &NdisPacket, NULL, Size );
  55     if( !NT_SUCCESS(NdisStatus) ) return NULL;
  56
  57     GetDataPtr( NdisPacket, 0, (PCHAR *)&DataBuffer, (PUINT)&Contig );
  58     ASSERT(DataBuffer);
  59
  60     RtlZeroMemory(DataBuffer, Size);
  61     Header = (PARP_HEADER)((ULONG_PTR)DataBuffer + MaxLLHeaderSize);
  62     Header->HWType       = HardwareType;
  63     Header->ProtoType    = ProtocolType;
  64     Header->HWAddrLen    = LinkAddressLength;
  65     Header->ProtoAddrLen = ProtoAddressLength;
  66     Header->Opcode       = Opcode; /* Already swapped */
  67     DataBuffer = (PVOID)((ULONG_PTR)Header + sizeof(ARP_HEADER));
  68
  69     /* Our hardware address */
  70     RtlCopyMemory(DataBuffer, SenderLinkAddress, LinkAddressLength);
  71     DataBuffer = (PVOID)((ULONG_PTR)DataBuffer + LinkAddressLength);
  72
  73     /* Our protocol address */
  74     RtlCopyMemory(DataBuffer, SenderProtoAddress, ProtoAddressLength);
  75
  76     if (TargetLinkAddress) {
  77         DataBuffer = (PVOID)((ULONG_PTR)DataBuffer + ProtoAddressLength);
  78         /* Target hardware address */
  79         RtlCopyMemory(DataBuffer, TargetLinkAddress, LinkAddressLength);
  80         DataBuffer = (PVOID)((ULONG_PTR)DataBuffer + LinkAddressLength);
  81     } else
  82         /* Don't care about target hardware address */
  83         DataBuffer = (PVOID)((ULONG_PTR)DataBuffer + ProtoAddressLength + LinkAddressLength);
  84
  85     /* Target protocol address */
  86     RtlCopyMemory(DataBuffer, TargetProtoAddress, ProtoAddressLength);
  87
  88     return NdisPacket;
  89 }
  90
  91
  92 VOID ARPTransmitComplete(
  93     PVOID Context,
  94     PNDIS_PACKET NdisPacket,
  95     NDIS_STATUS NdisStatus)
  96 /*
  97  * FUNCTION: ARP request transmit completion handler
  98  * ARGUMENTS:
  99  *     Context    = Pointer to context information (IP_INTERFACE)
 100  *     Packet     = Pointer to NDIS packet that was sent
 101  *     NdisStatus = NDIS status of operation
 102  * NOTES:
 103  *    This routine is called when an ARP request has been sent
 104  */
 105 {
 106     TI_DbgPrint(DEBUG_ARP, ("Called.\n"));
 107     FreeNdisPacket(NdisPacket);
 108 }
 109
 110
 111 BOOLEAN ARPTransmit(
 112     PIP_ADDRESS Address,
 113     PNET_TABLE_ENTRY NTE)
 114 /*
 115  * FUNCTION: Creates an ARP request and transmits it on a network
 116  * ARGUMENTS:
 117  *     Address = Pointer to IP address to resolve
 118  *     NTE     = Pointer to net table entru to use for transmitting request
 119  * RETURNS:
 120  *     TRUE if the request was successfully sent, FALSE if not
 121  */
 122 {
 123     PIP_INTERFACE Interface;
 124     PNDIS_PACKET NdisPacket;
 125     UCHAR ProtoAddrLen;
 126     USHORT ProtoType;
 127
 128     TI_DbgPrint(DEBUG_ARP, ("Called.\n"));
 129
 130     Interface = NTE->Interface;
 131
 132     switch (Address->Type) {
 133         case IP_ADDRESS_V4:
 134             ProtoType    = (USHORT)ETYPE_IPv4; /* IPv4 */
 135             ProtoAddrLen = 4;                  /* Length of IPv4 address */
 136             break;
 137         case IP_ADDRESS_V6:
 138             ProtoType    = (USHORT)ETYPE_IPv6; /* IPv6 */
 139             ProtoAddrLen = 16;                 /* Length of IPv6 address */
 140             break;
 141         default:
 142             TI_DbgPrint(DEBUG_ARP,("Bad Address Type %x\n", Address->Type));
 143             KeBugCheck(0);
 144             /* Should not happen */
 145             return FALSE;
 146     }
 147
 148     NdisPacket = PrepareARPPacket(
 149         WN2H(0x0001),                    /* FIXME: Ethernet only */
 150         ProtoType,                       /* Protocol type */
 151         (UCHAR)Interface->AddressLength, /* Hardware address length */
 152         (UCHAR)ProtoAddrLen,             /* Protocol address length */
 153         Interface->Address,              /* Sender's (local) hardware address */
 154         &NTE->Address->Address,          /* Sender's (local) protocol address */
 155         NULL,                            /* Don't care */
 156         &Address->Address,               /* Target's (remote) protocol address */
 157         ARP_OPCODE_REQUEST);             /* ARP request */
 158
 159     ASSERT_KM_POINTER(NdisPacket);
 160     ASSERT_KM_POINTER(PC(NdisPacket));
 161     PC(NdisPacket)->DLComplete = ARPTransmitComplete;
 162
 163     TI_DbgPrint(DEBUG_ARP,("Sending ARP Packet\n"));
 164
 165     (*Interface->Transmit)(Interface->Context, NdisPacket,
 166         MaxLLHeaderSize, NULL, LAN_PROTO_ARP);
 167
 168     return TRUE;
 169 }
 170
 171
 172 VOID ARPReceive(
 173     PVOID Context,
 174     PIP_PACKET Packet)
 175 /*
 176  * FUNCTION: Receives an ARP packet
 177  * ARGUMENTS:
 178  *     Context = Pointer to context information (IP_INTERFACE)
 179  *     Packet  = Pointer to packet
 180  */
 181 {
 182     PARP_HEADER Header;
 183     PIP_ADDRESS Address;
 184     PVOID SenderHWAddress;
 185     PVOID SenderProtoAddress;
 186     PVOID TargetProtoAddress;
 187     PADDRESS_ENTRY ADE;
 188     PNEIGHBOR_CACHE_ENTRY NCE;
 189     PNDIS_PACKET NdisPacket;
 190     PIP_INTERFACE Interface = (PIP_INTERFACE)Context;
 191
 192     TI_DbgPrint(DEBUG_ARP, ("Called.\n"));
 193
 194     Header = (PARP_HEADER)Packet->Header;
 195
 196     /* FIXME: Ethernet only */
 197     if (WN2H(Header->HWType) != 1) {
 198         TI_DbgPrint(DEBUG_ARP, ("Unknown ARP hardware type (0x%X).\n", WN2H(Header->HWType)));
 199         return;
 200     }
 201
 202     /* Check protocol type */
 203     if (Header->ProtoType != ETYPE_IPv4) {
 204         TI_DbgPrint(DEBUG_ARP, ("Unknown ARP protocol type (0x%X).\n", WN2H(Header->ProtoType)));
 205         return;
 206     }
 207
 208     SenderHWAddress    = (PVOID)((ULONG_PTR)Header + sizeof(ARP_HEADER));
 209     SenderProtoAddress = (PVOID)((ULONG_PTR)SenderHWAddress + Header->HWAddrLen);
 210
 211     /* Check if we have the target protocol address */
 212
 213     TargetProtoAddress = (PVOID)((ULONG_PTR)SenderProtoAddress +
 214         Header->ProtoAddrLen + Header->HWAddrLen);
 215
 216     Address = AddrBuildIPv4(*((PULONG)TargetProtoAddress));
 217     ADE = IPLocateADE(Address, ADE_UNICAST);
 218     if (!ADE) {
 219         TI_DbgPrint(DEBUG_ARP, ("Target address (0x%X) is not mine.\n", *((PULONG)TargetProtoAddress)));
 220         return;
 221     }
 222
 223     /* Check if we know the sender */
 224
 225     AddrInitIPv4(Address, *((PULONG)SenderProtoAddress));
 226     NCE = NBLocateNeighbor(Address);
 227     if (NCE) {
 228         /* We know the sender. Update the hardware address
 229            and state in our neighbor address cache */
 230         NBUpdateNeighbor(NCE, SenderHWAddress, NUD_REACHABLE);
 231     } else {
 232         /* The packet had our protocol address as target. The sender
 233            may want to communicate with us soon, so add his address
 234            to our address cache */
 235         NCE = NBAddNeighbor(Interface, Address, SenderHWAddress,
 236             Header->HWAddrLen, NUD_REACHABLE);
 237     }
 238
 239     if (Header->Opcode != ARP_OPCODE_REQUEST)
 240         return;
 241
 242     /* This is a request for our address. Swap the addresses and
 243        send an ARP reply back to the sender */
 244     NdisPacket = PrepareARPPacket(
 245         Header->HWType,                  /* Hardware type */
 246         Header->ProtoType,               /* Protocol type */
 247         (UCHAR)Interface->AddressLength, /* Hardware address length */
 248         (UCHAR)Header->ProtoAddrLen,     /* Protocol address length */
 249         Interface->Address,              /* Sender's (local) hardware address */
 250         &ADE->Address.Address,           /* Sender's (local) protocol address */
 251         SenderHWAddress,                 /* Target's (remote) hardware address */
 252         SenderProtoAddress,              /* Target's (remote) protocol address */
 253         ARP_OPCODE_REPLY);               /* ARP reply */
 254     if (NdisPacket) {
 255         PC(NdisPacket)->DLComplete = ARPTransmitComplete;
 256         (*Interface->Transmit)(Interface->Context,
 257                                NdisPacket,
 258                                MaxLLHeaderSize,
 259                                SenderHWAddress,
 260                                LAN_PROTO_ARP);
 261     }
 262 }
 263
 264 /* EOF */