ReactOS  0.4.14-dev-384-g5b37caa
arp.h File Reference
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Classes

struct  ARP_HEADER
 

Macros

#define ARP_OPCODE_REQUEST   WH2N(0x0001) /* ARP request */
 
#define ARP_OPCODE_REPLY   WH2N(0x0002) /* ARP reply */
 

Typedefs

typedef struct ARP_HEADER ARP_HEADER
 
typedef struct ARP_HEADERPARP_HEADER
 

Functions

BOOLEAN ARPTransmit (PIP_ADDRESS Address, PVOID LinkAddress, PIP_INTERFACE Interface)
 
VOID ARPReceive (PVOID Context, PIP_PACKET Packet)
 

Macro Definition Documentation

◆ ARP_OPCODE_REPLY

#define ARP_OPCODE_REPLY   WH2N(0x0002) /* ARP reply */

Definition at line 24 of file arp.h.

◆ ARP_OPCODE_REQUEST

#define ARP_OPCODE_REQUEST   WH2N(0x0001) /* ARP request */

Definition at line 23 of file arp.h.

Typedef Documentation

◆ ARP_HEADER

◆ PARP_HEADER

Function Documentation

◆ ARPReceive()

VOID ARPReceive ( PVOID  Context,
PIP_PACKET  Packet 
)

Definition at line 175 of file arp.c.

184 {
186  IP_ADDRESS SrcAddress;
187  IP_ADDRESS DstAddress;
188  PCHAR SenderHWAddress, SenderProtoAddress, TargetProtoAddress;
190  PNDIS_PACKET NdisPacket;
193  PCHAR DataBuffer;
194 
195  PAGED_CODE();
196 
197  TI_DbgPrint(DEBUG_ARP, ("Called.\n"));
198 
200  sizeof(ARP_HEADER),
202  if (!Packet->Header)
203  {
204  TI_DbgPrint(DEBUG_ARP, ("Unable to allocate header buffer\n"));
205  Packet->Free(Packet);
206  return;
207  }
208  Packet->MappedHeader = FALSE;
209 
211  Packet->NdisPacket,
212  Packet->Position,
213  sizeof(ARP_HEADER));
214  if (BytesCopied != sizeof(ARP_HEADER))
215  {
216  TI_DbgPrint(DEBUG_ARP, ("Unable to copy in header buffer\n"));
217  Packet->Free(Packet);
218  return;
219  }
220 
221  Header = (PARP_HEADER)Packet->Header;
222 
223  /* FIXME: Ethernet only */
224  if (WN2H(Header->HWType) != 1) {
225  TI_DbgPrint(DEBUG_ARP, ("Unknown ARP hardware type (0x%X).\n", WN2H(Header->HWType)));
226  Packet->Free(Packet);
227  return;
228  }
229 
230  /* Check protocol type */
231  if (Header->ProtoType != ETYPE_IPv4) {
232  TI_DbgPrint(DEBUG_ARP, ("Unknown ARP protocol type (0x%X).\n", WN2H(Header->ProtoType)));
233  Packet->Free(Packet);
234  return;
235  }
236 
237  DataSize = (2 * Header->HWAddrLen) + (2 * Header->ProtoAddrLen);
238  DataBuffer = ExAllocatePool(PagedPool,
239  DataSize);
240  if (!DataBuffer)
241  {
242  TI_DbgPrint(DEBUG_ARP, ("Unable to allocate data buffer\n"));
243  Packet->Free(Packet);
244  return;
245  }
246 
247  BytesCopied = CopyPacketToBuffer(DataBuffer,
248  Packet->NdisPacket,
249  Packet->Position + sizeof(ARP_HEADER),
250  DataSize);
251  if (BytesCopied != DataSize)
252  {
253  TI_DbgPrint(DEBUG_ARP, ("Unable to copy in data buffer\n"));
254  ExFreePool(DataBuffer);
255  Packet->Free(Packet);
256  return;
257  }
258 
259  SenderHWAddress = (PVOID)(DataBuffer);
260  SenderProtoAddress = (PVOID)(SenderHWAddress + Header->HWAddrLen);
261  TargetProtoAddress = (PVOID)(SenderProtoAddress + Header->ProtoAddrLen + Header->HWAddrLen);
262 
263  AddrInitIPv4(&DstAddress, *((PULONG)TargetProtoAddress));
264  if (!AddrIsEqual(&DstAddress, &Interface->Unicast))
265  {
266  ExFreePool(DataBuffer);
267  Packet->Free(Packet);
268  return;
269  }
270 
271  AddrInitIPv4(&SrcAddress, *((PULONG)SenderProtoAddress));
272 
273  /* Check if we know the sender */
274  NCE = NBLocateNeighbor(&SrcAddress, Interface);
275  if (NCE) {
276  /* We know the sender. Update the hardware address
277  and state in our neighbor address cache */
278  NBUpdateNeighbor(NCE, SenderHWAddress, 0);
279  } else {
280  /* The packet had our protocol address as target. The sender
281  may want to communicate with us soon, so add his address
282  to our address cache */
283  NBAddNeighbor(Interface, &SrcAddress, SenderHWAddress,
284  Header->HWAddrLen, 0, ARP_COMPLETE_TIMEOUT);
285  }
286 
287  if (Header->Opcode != ARP_OPCODE_REQUEST)
288  {
289  ExFreePool(DataBuffer);
290  Packet->Free(Packet);
291  return;
292  }
293 
294  /* This is a request for our address. Swap the addresses and
295  send an ARP reply back to the sender */
296  NdisPacket = PrepareARPPacket(
297  Interface,
298  Header->HWType, /* Hardware type */
299  Header->ProtoType, /* Protocol type */
300  (UCHAR)Interface->AddressLength, /* Hardware address length */
301  (UCHAR)Header->ProtoAddrLen, /* Protocol address length */
302  Interface->Address, /* Sender's (local) hardware address */
303  &Interface->Unicast.Address.IPv4Address,/* Sender's (local) protocol address */
304  SenderHWAddress, /* Target's (remote) hardware address */
305  SenderProtoAddress, /* Target's (remote) protocol address */
306  ARP_OPCODE_REPLY); /* ARP reply */
307  if (NdisPacket) {
308  PC(NdisPacket)->DLComplete = ARPTransmitComplete;
309  (*Interface->Transmit)(Interface->Context,
310  NdisPacket,
311  0,
312  SenderHWAddress,
313  LAN_PROTO_ARP);
314  }
315 
316  ExFreePool(DataBuffer);
317  Packet->Free(Packet);
318 }
signed char * PCHAR
Definition: retypes.h:7
#define TI_DbgPrint(_t_, _x_)
Definition: debug.h:45
PNDIS_PACKET PrepareARPPacket(PIP_INTERFACE IF, USHORT HardwareType, USHORT ProtocolType, UCHAR LinkAddressLength, UCHAR ProtoAddressLength, PVOID SenderLinkAddress, PVOID SenderProtoAddress, PVOID TargetLinkAddress, PVOID TargetProtoAddress, USHORT Opcode)
Definition: arp.c:13
_In_ NDIS_HANDLE _In_ PNDIS_PACKET Packet
Definition: ndis.h:1548
Definition: neighbor.h:28
struct _IP_INTERFACE * PIP_INTERFACE
PNEIGHBOR_CACHE_ENTRY NBLocateNeighbor(PIP_ADDRESS Address, PIP_INTERFACE Interface)
Definition: neighbor.c:417
#define PAGED_CODE()
Definition: video.h:57
VOID ARPTransmitComplete(PVOID Context, PNDIS_PACKET NdisPacket, NDIS_STATUS NdisStatus)
Definition: arp.c:92
Definition: ip.h:23
Definition: Header.h:8
_In_ UINT _In_ UINT _In_ PNDIS_PACKET _In_ UINT _Out_ PUINT BytesCopied
Definition: ndis.h:3167
#define LAN_PROTO_ARP
Definition: lan.h:128
#define PC(Packet)
Definition: ip.h:106
void * PVOID
Definition: retypes.h:9
VOID NBUpdateNeighbor(PNEIGHBOR_CACHE_ENTRY NCE, PVOID LinkAddress, UCHAR State)
Definition: neighbor.c:346
IN PVOID IN PVOID IN USHORT IN USHORT IN PINTERFACE Interface
Definition: pci.h:359
#define ARP_COMPLETE_TIMEOUT
Definition: neighbor.h:52
if(!(yy_init))
Definition: macro.lex.yy.c:714
#define AddrInitIPv4(IPAddress, RawAddress)
Definition: address.h:16
#define ETYPE_IPv4
Definition: lan.h:121
#define WN2H(w)
Definition: addrconv.c:35
#define ExAllocatePoolWithTag(hernya, size, tag)
Definition: env_spec_w32.h:350
unsigned char UCHAR
Definition: xmlstorage.h:181
BOOLEAN AddrIsEqual(PIP_ADDRESS Address1, PIP_ADDRESS Address2)
Definition: address.c:221
#define ExAllocatePool(type, size)
Definition: fbtusb.h:44
PNEIGHBOR_CACHE_ENTRY NBAddNeighbor(PIP_INTERFACE Interface, PIP_ADDRESS Address, PVOID LinkAddress, UINT LinkAddressLength, UCHAR Type, UINT EventTimer)
Definition: neighbor.c:273
#define ARP_OPCODE_REPLY
Definition: arp.h:24
Definition: arp.h:10
UINT CopyPacketToBuffer(PUCHAR DstData, PNDIS_PACKET SrcPacket, UINT SrcOffset, UINT Length)
Definition: buffer.c:170
#define ARP_OPCODE_REQUEST
Definition: arp.h:23
unsigned int * PULONG
Definition: retypes.h:1
#define DEBUG_ARP
Definition: debug.h:25
struct ARP_HEADER * PARP_HEADER
unsigned int ULONG
Definition: retypes.h:1
_In_ NDIS_STATUS _In_ ULONG _In_ USHORT _In_opt_ PVOID _In_ ULONG DataSize
Definition: ndis.h:4751
#define PACKET_BUFFER_TAG
Definition: tags.h:27
#define ExFreePool(addr)
Definition: env_spec_w32.h:352

Referenced by LanReceiveWorker().

◆ ARPTransmit()

BOOLEAN ARPTransmit ( PIP_ADDRESS  Address,
PVOID  LinkAddress,
PIP_INTERFACE  Interface 
)

Definition at line 111 of file arp.c.

120 {
121  PNDIS_PACKET NdisPacket;
122  UCHAR ProtoAddrLen;
124 
125  TI_DbgPrint(DEBUG_ARP, ("Called.\n"));
126 
127  /* If Address is NULL then the caller wants an
128  * gratuitous ARP packet sent */
129  if (!Address)
130  Address = &Interface->Unicast;
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  DbgBreakPoint();
144  /* Should not happen */
145  return FALSE;
146  }
147 
148  NdisPacket = PrepareARPPacket(
149  Interface,
150  WN2H(0x0001), /* FIXME: Ethernet only */
151  ProtoType, /* Protocol type */
152  (UCHAR)Interface->AddressLength, /* Hardware address length */
153  (UCHAR)ProtoAddrLen, /* Protocol address length */
154  Interface->Address, /* Sender's (local) hardware address */
155  &Interface->Unicast.Address.IPv4Address,/* Sender's (local) protocol address */
156  LinkAddress, /* Target's (remote) hardware address */
157  &Address->Address.IPv4Address, /* Target's (remote) protocol address */
158  ARP_OPCODE_REQUEST); /* ARP request */
159 
160  if( !NdisPacket ) return FALSE;
161 
162  ASSERT_KM_POINTER(NdisPacket);
163  ASSERT_KM_POINTER(PC(NdisPacket));
164  PC(NdisPacket)->DLComplete = ARPTransmitComplete;
165 
166  TI_DbgPrint(DEBUG_ARP,("Sending ARP Packet\n"));
167 
168  (*Interface->Transmit)(Interface->Context, NdisPacket,
169  0, NULL, LAN_PROTO_ARP);
170 
171  return TRUE;
172 }
#define TI_DbgPrint(_t_, _x_)
Definition: debug.h:45
#define TRUE
Definition: types.h:120
PNDIS_PACKET PrepareARPPacket(PIP_INTERFACE IF, USHORT HardwareType, USHORT ProtocolType, UCHAR LinkAddressLength, UCHAR ProtoAddressLength, PVOID SenderLinkAddress, PVOID SenderProtoAddress, PVOID TargetLinkAddress, PVOID TargetProtoAddress, USHORT Opcode)
Definition: arp.c:13
#define ETYPE_IPv6
Definition: lan.h:122
void DbgBreakPoint()
Definition: mach.c:553
VOID ARPTransmitComplete(PVOID Context, PNDIS_PACKET NdisPacket, NDIS_STATUS NdisStatus)
Definition: arp.c:92
ProtoType
Definition: netstat.c:32
#define IP_ADDRESS_V4
Definition: ip.h:32
smooth NULL
Definition: ftsmooth.c:416
static WCHAR Address[46]
Definition: ping.c:68
#define LAN_PROTO_ARP
Definition: lan.h:128
#define PC(Packet)
Definition: ip.h:106
#define IP_ADDRESS_V6
Definition: ip.h:33
IN PVOID IN PVOID IN USHORT IN USHORT IN PINTERFACE Interface
Definition: pci.h:359
#define ETYPE_IPv4
Definition: lan.h:121
#define WN2H(w)
Definition: addrconv.c:35
#define ASSERT_KM_POINTER(_x)
Definition: debug.h:74
unsigned char UCHAR
Definition: xmlstorage.h:181
unsigned short USHORT
Definition: pedump.c:61
#define ARP_OPCODE_REQUEST
Definition: arp.h:23
#define DEBUG_ARP
Definition: debug.h:25

Referenced by DispTdiQueryIpHwAddress(), IPAddInterfaceRoute(), and NBSendSolicit().