6 #include <api_drv_common.h>
9 #define UDP_ALLOC_BASE 0xC000
12 void UDP_Initialise();
13 void UDP_GetPacket(tInterface *Interface, void *Address, int Length, void *Buffer);
14 void UDP_Unreachable(tInterface *Interface, int Code, void *Address, int Length, void *Buffer);
15 void UDP_SendPacketTo(tUDPChannel *Channel, int AddrType, const void *Address, Uint16 Port, const void *Data, size_t Length);
16 // --- Client Channels
17 tVFS_Node *UDP_Channel_Init(tInterface *Interface);
18 size_t UDP_Channel_Read(tVFS_Node *Node, off_t Offset, size_t Length, void *Buffer);
19 size_t UDP_Channel_Write(tVFS_Node *Node, off_t Offset, size_t Length, const void *Buffer);
20 int UDP_Channel_IOCtl(tVFS_Node *Node, int ID, void *Data);
21 void UDP_Channel_Close(tVFS_Node *Node);
23 Uint16 UDP_int_AllocatePort();
24 int UDP_int_MarkPortAsUsed(Uint16 Port);
25 void UDP_int_FreePort(Uint16 Port);
28 tVFS_NodeType gUDP_NodeType = {
29 .Read = UDP_Channel_Read,
30 .Write = UDP_Channel_Write,
31 .IOCtl = UDP_Channel_IOCtl,
32 .Close = UDP_Channel_Close
34 tMutex glUDP_Channels;
35 tUDPChannel *gpUDP_Channels;
38 Uint32 gUDP_Ports[0x10000/32];
40 tSocketFile gUDP_SocketFile = {NULL, "udp", UDP_Channel_Init};
44 * \fn void TCP_Initialise()
45 * \brief Initialise the TCP Layer
49 IPStack_AddFile(&gUDP_SocketFile);
50 //IPv4_RegisterCallback(IP4PROT_UDP, UDP_GetPacket, UDP_Unreachable);
51 IPv4_RegisterCallback(IP4PROT_UDP, UDP_GetPacket);
55 * \brief Scan a list of tUDPChannels and find process the first match
56 * \return 0 if no match was found, -1 on error and 1 if a match was found
58 int UDP_int_ScanList(tUDPChannel *List, tInterface *Interface, void *Address, int Length, void *Buffer)
60 tUDPHeader *hdr = Buffer;
69 // Match local endpoint
70 if(chan->Interface && chan->Interface != Interface) continue;
71 if(chan->LocalPort != ntohs(hdr->DestPort)) continue;
73 // Check for remote port restriction
74 if(chan->Remote.Port && chan->Remote.Port != ntohs(hdr->SourcePort))
76 // Check for remote address restriction
79 if(chan->Remote.AddrType != Interface->Type)
81 if(!IPStack_CompareAddress(Interface->Type, Address,
82 &chan->Remote.Addr, chan->RemoteMask)
87 Log_Log("UDP", "Recieved packet for %p", chan);
88 // Create the cached packet
89 len = ntohs(hdr->Length);
90 pack = malloc(sizeof(tUDPPacket) + len);
92 memcpy(&pack->Remote.Addr, Address, IPStack_GetAddressSize(Interface->Type));
93 pack->Remote.Port = ntohs(hdr->SourcePort);
94 pack->Remote.AddrType = Interface->Type;
96 memcpy(pack->Data, hdr->Data, len);
98 // Add the packet to the channel's queue
99 SHORTLOCK(&chan->lQueue);
101 chan->QueueEnd->Next = pack;
103 chan->QueueEnd = chan->Queue = pack;
104 SHORTREL(&chan->lQueue);
105 VFS_MarkAvaliable(&chan->Node, 1);
106 Mutex_Release(&glUDP_Channels);
113 * \fn void UDP_GetPacket(tInterface *Interface, void *Address, int Length, void *Buffer)
114 * \brief Handles a packet from the IP Layer
116 void UDP_GetPacket(tInterface *Interface, void *Address, int Length, void *Buffer)
118 tUDPHeader *hdr = Buffer;
120 Log_Debug("UDP", "hdr->SourcePort = %i", ntohs(hdr->SourcePort));
121 Log_Debug("UDP", "hdr->DestPort = %i", ntohs(hdr->DestPort));
122 Log_Debug("UDP", "hdr->Length = %i", ntohs(hdr->Length));
123 Log_Debug("UDP", "hdr->Checksum = 0x%x", ntohs(hdr->Checksum));
125 // Check registered connections
126 Mutex_Acquire(&glUDP_Channels);
127 UDP_int_ScanList(gpUDP_Channels, Interface, Address, Length, Buffer);
128 Mutex_Release(&glUDP_Channels);
132 * \brief Handle an ICMP Unrechable Error
134 void UDP_Unreachable(tInterface *Interface, int Code, void *Address, int Length, void *Buffer)
140 * \brief Send a packet
141 * \param Channel Channel to send the packet from
142 * \param Data Packet data
143 * \param Length Length in bytes of packet data
145 void UDP_SendPacketTo(tUDPChannel *Channel, int AddrType, const void *Address, Uint16 Port, const void *Data, size_t Length)
149 if(Channel->Interface && Channel->Interface->Type != AddrType) return ;
155 hdr.SourcePort = htons( Channel->LocalPort );
156 hdr.DestPort = htons( Port );
157 hdr.Length = htons( sizeof(tUDPHeader) + Length );
158 hdr.Checksum = 0; // Checksum can be zero on IPv4
159 // Pass on the the IPv4 Layer
160 tIPStackBuffer *buffer = IPStack_Buffer_CreateBuffer(2 + IPV4_BUFFERS);
161 IPStack_Buffer_AppendSubBuffer(buffer, Length, 0, Data, NULL, NULL);
162 IPStack_Buffer_AppendSubBuffer(buffer, sizeof(hdr), 0, &hdr, NULL, NULL);
163 // TODO: What if Channel->Interface is NULL here?
164 IPv4_SendPacket(Channel->Interface, *(tIPv4*)Address, IP4PROT_UDP, 0, buffer);
165 IPStack_Buffer_DestroyBuffer(buffer);
170 // --- Client Channels
171 tVFS_Node *UDP_Channel_Init(tInterface *Interface)
174 new = calloc( sizeof(tUDPChannel), 1 );
175 new->Interface = Interface;
176 new->Node.ImplPtr = new;
177 new->Node.NumACLs = 1;
178 new->Node.ACLs = &gVFS_ACL_EveryoneRW;
179 new->Node.Type = &gUDP_NodeType;
181 Mutex_Acquire(&glUDP_Channels);
182 new->Next = gpUDP_Channels;
183 gpUDP_Channels = new;
184 Mutex_Release(&glUDP_Channels);
190 * \brief Read from the channel file (wait for a packet)
192 size_t UDP_Channel_Read(tVFS_Node *Node, off_t Offset, size_t Length, void *Buffer)
194 tUDPChannel *chan = Node->ImplPtr;
199 if(chan->LocalPort == 0) {
200 Log_Notice("UDP", "Channel %p sent with no local port", chan);
204 while(chan->Queue == NULL) Threads_Yield();
208 VFS_SelectNode(Node, VFS_SELECT_READ, NULL, "UDP_Channel_Read");
209 SHORTLOCK(&chan->lQueue);
210 if(chan->Queue == NULL) {
211 SHORTREL(&chan->lQueue);
215 chan->Queue = pack->Next;
217 chan->QueueEnd = NULL;
218 VFS_MarkAvaliable(Node, 0); // Nothing left
220 SHORTREL(&chan->lQueue);
224 // Check that the header fits
225 addrlen = IPStack_GetAddressSize(pack->Remote.AddrType);
230 Log_Notice("UDP", "Insuficient space for header in buffer (%i < %i)", (int)Length, ofs);
235 ep->Port = pack->Remote.Port;
236 ep->AddrType = pack->Remote.AddrType;
237 memcpy(&ep->Addr, &pack->Remote.Addr, addrlen);
240 if(Length > ofs + pack->Length) Length = ofs + pack->Length;
241 memcpy((char*)Buffer + ofs, pack->Data, Length - ofs);
243 // Free cached packet
250 * \brief Write to the channel file (send a packet)
252 size_t UDP_Channel_Write(tVFS_Node *Node, off_t Offset, size_t Length, const void *Buffer)
254 tUDPChannel *chan = Node->ImplPtr;
255 const tUDPEndpoint *ep;
259 if(chan->LocalPort == 0) {
260 Log_Notice("UDP", "Write to channel %p with zero local port", chan);
265 ofs = 2 + 2 + IPStack_GetAddressSize( ep->AddrType );
267 data = (const char *)Buffer + ofs;
269 UDP_SendPacketTo(chan, ep->AddrType, &ep->Addr, ep->Port, data, (size_t)Length - ofs);
275 * \brief Names for channel IOCtl Calls
277 static const char *casIOCtls_Channel[] = {
286 * \brief Channel IOCtls
288 int UDP_Channel_IOCtl(tVFS_Node *Node, int ID, void *Data)
290 tUDPChannel *chan = Node->ImplPtr;
291 ENTER("pNode iID pData", Node, ID, Data);
294 BASE_IOCTLS(DRV_TYPE_MISC, "UDP Channel", 0x100, casIOCtls_Channel);
296 case 4: // getset_localport (returns bool success)
297 if(!Data) LEAVE_RET('i', chan->LocalPort);
298 if(!CheckMem( Data, sizeof(Uint16) ) ) {
299 LOG("Invalid pointer %p", Data);
303 chan->LocalPort = *(Uint16*)Data;
304 // Permissions check (Ports lower than 1024 are root-only)
305 if(chan->LocalPort != 0 && chan->LocalPort < 1024) {
306 if( Threads_GetUID() != 0 ) {
307 LOG("Attempt by non-superuser to listen on port %i", chan->LocalPort);
312 // Allocate a random port if requested
313 if( chan->LocalPort == 0 )
314 chan->LocalPort = UDP_int_AllocatePort();
317 // Else, mark the requested port as used
318 if( UDP_int_MarkPortAsUsed(chan->LocalPort) == 0 ) {
319 LOG("Port %i us currently in use", chan->LocalPort);
327 case 5: // getset_remoteport (returns bool success)
328 if(!Data) LEAVE_RET('i', chan->Remote.Port);
329 if(!CheckMem( Data, sizeof(Uint16) ) ) {
330 LOG("Invalid pointer %p", Data);
333 chan->Remote.Port = *(Uint16*)Data;
336 case 6: // getset_remotemask (returns bool success)
337 if(!Data) LEAVE_RET('i', chan->RemoteMask);
338 if(!CheckMem(Data, sizeof(int))) LEAVE_RET('i', -1);
339 if( !chan->Interface ) {
340 LOG("Can't set remote mask on NULL interface");
343 if( *(int*)Data > IPStack_GetAddressSize(chan->Interface->Type) )
345 chan->RemoteMask = *(int*)Data;
348 case 7: // set_remoteaddr (returns bool success)
349 if( !chan->Interface ) {
350 LOG("Can't set remote address on NULL interface");
353 if(!CheckMem(Data, IPStack_GetAddressSize(chan->Interface->Type))) {
354 LOG("Invalid pointer");
357 memcpy(&chan->Remote.Addr, Data, IPStack_GetAddressSize(chan->Interface->Type));
364 * \brief Close and destroy an open channel
366 void UDP_Channel_Close(tVFS_Node *Node)
368 tUDPChannel *chan = Node->ImplPtr;
371 // Remove from the main list first
372 Mutex_Acquire(&glUDP_Channels);
373 if(gpUDP_Channels == chan)
374 gpUDP_Channels = gpUDP_Channels->Next;
377 for(prev = gpUDP_Channels;
378 prev->Next && prev->Next != chan;
381 Log_Warning("UDP", "Bookeeping Fail, channel %p is not in main list", chan);
383 prev->Next = prev->Next->Next;
385 Mutex_Release(&glUDP_Channels);
388 SHORTLOCK(&chan->lQueue);
393 chan->Queue = tmp->Next;
396 SHORTREL(&chan->lQueue);
398 // Free channel structure
403 * \return Port Number on success, or zero on failure
405 Uint16 UDP_int_AllocatePort()
408 Mutex_Acquire(&glUDP_Ports);
410 for( i = UDP_ALLOC_BASE; i < 0x10000; i += 32 )
411 if( gUDP_Ports[i/32] != 0xFFFFFFFF )
413 if(i == 0x10000) return 0;
416 if( !(gUDP_Ports[i/32] & (1 << (i%32))) )
419 Mutex_Release(&glUDP_Ports);
423 * \brief Allocate a specific port
424 * \return Boolean Success
426 int UDP_int_MarkPortAsUsed(Uint16 Port)
428 Mutex_Acquire(&glUDP_Ports);
429 if( gUDP_Ports[Port/32] & (1 << (Port%32)) ) {
431 Mutex_Release(&glUDP_Ports);
433 gUDP_Ports[Port/32] |= 1 << (Port%32);
434 Mutex_Release(&glUDP_Ports);
439 * \brief Free an allocated port
441 void UDP_int_FreePort(Uint16 Port)
443 Mutex_Acquire(&glUDP_Ports);
444 gUDP_Ports[Port/32] &= ~(1 << (Port%32));
445 Mutex_Release(&glUDP_Ports);