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 Uint64 UDP_Channel_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
19 Uint64 UDP_Channel_Write(tVFS_Node *Node, Uint64 Offset, Uint64 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);
95 memcpy(pack->Data, hdr->Data, len);
97 // Add the packet to the channel's queue
98 SHORTLOCK(&chan->lQueue);
100 chan->QueueEnd->Next = pack;
102 chan->QueueEnd = chan->Queue = pack;
103 SHORTREL(&chan->lQueue);
104 VFS_MarkAvaliable(&chan->Node, 1);
105 Mutex_Release(&glUDP_Channels);
112 * \fn void UDP_GetPacket(tInterface *Interface, void *Address, int Length, void *Buffer)
113 * \brief Handles a packet from the IP Layer
115 void UDP_GetPacket(tInterface *Interface, void *Address, int Length, void *Buffer)
117 tUDPHeader *hdr = Buffer;
119 Log_Debug("UDP", "hdr->SourcePort = %i", ntohs(hdr->SourcePort));
120 Log_Debug("UDP", "hdr->DestPort = %i", ntohs(hdr->DestPort));
121 Log_Debug("UDP", "hdr->Length = %i", ntohs(hdr->Length));
122 Log_Debug("UDP", "hdr->Checksum = 0x%x", ntohs(hdr->Checksum));
124 // Check registered connections
125 Mutex_Acquire(&glUDP_Channels);
126 UDP_int_ScanList(gpUDP_Channels, Interface, Address, Length, Buffer);
127 Mutex_Release(&glUDP_Channels);
131 * \brief Handle an ICMP Unrechable Error
133 void UDP_Unreachable(tInterface *Interface, int Code, void *Address, int Length, void *Buffer)
139 * \brief Send a packet
140 * \param Channel Channel to send the packet from
141 * \param Data Packet data
142 * \param Length Length in bytes of packet data
144 void UDP_SendPacketTo(tUDPChannel *Channel, int AddrType, const void *Address, Uint16 Port, const void *Data, size_t Length)
148 if(Channel->Interface && Channel->Interface->Type != AddrType) return ;
154 hdr = malloc(sizeof(tUDPHeader)+Length);
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 memcpy(hdr->Data, Data, Length);
160 // Pass on the the IPv4 Layer
161 // TODO: What if Channel->Interface is NULL here?
162 IPv4_SendPacket(Channel->Interface, *(tIPv4*)Address, IP4PROT_UDP, 0, sizeof(tUDPHeader)+Length, hdr);
163 // Free allocated packet
169 // --- Client Channels
170 tVFS_Node *UDP_Channel_Init(tInterface *Interface)
173 new = calloc( sizeof(tUDPChannel), 1 );
174 new->Interface = Interface;
175 new->Node.ImplPtr = new;
176 new->Node.NumACLs = 1;
177 new->Node.ACLs = &gVFS_ACL_EveryoneRW;
178 new->Node.Type = &gUDP_NodeType;
180 Mutex_Acquire(&glUDP_Channels);
181 new->Next = gpUDP_Channels;
182 gpUDP_Channels = new;
183 Mutex_Release(&glUDP_Channels);
189 * \brief Read from the channel file (wait for a packet)
191 Uint64 UDP_Channel_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
193 tUDPChannel *chan = Node->ImplPtr;
198 if(chan->LocalPort == 0) {
199 Log_Notice("UDP", "Channel %p sent with no local port", chan);
203 while(chan->Queue == NULL) Threads_Yield();
207 VFS_SelectNode(Node, VFS_SELECT_READ, NULL, "UDP_Channel_Read");
208 SHORTLOCK(&chan->lQueue);
209 if(chan->Queue == NULL) {
210 SHORTREL(&chan->lQueue);
214 chan->Queue = pack->Next;
216 chan->QueueEnd = NULL;
217 VFS_MarkAvaliable(Node, 0); // Nothing left
219 SHORTREL(&chan->lQueue);
223 // Check that the header fits
225 ofs = 4 + IPStack_GetAddressSize(pack->Remote.AddrType);
228 Log_Notice("UDP", "Insuficient space for header in buffer (%i < %i)", (int)Length, ofs);
233 ep->Port = pack->Remote.Port;
234 ep->AddrType = pack->Remote.AddrType;
235 memcpy(&ep->Addr, &pack->Remote.Addr, IPStack_GetAddressSize(pack->Remote.AddrType));
238 if(Length > ofs + pack->Length) Length = ofs + pack->Length;
239 memcpy((char*)Buffer + ofs, pack->Data, Length - ofs);
241 // Free cached packet
248 * \brief Write to the channel file (send a packet)
250 Uint64 UDP_Channel_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, const void *Buffer)
252 tUDPChannel *chan = Node->ImplPtr;
253 const tUDPEndpoint *ep;
256 if(chan->LocalPort == 0) return 0;
259 ofs = 2 + 2 + IPStack_GetAddressSize( ep->AddrType );
261 data = (const char *)Buffer + ofs;
263 UDP_SendPacketTo(chan, ep->AddrType, &ep->Addr, ep->Port, data, (size_t)Length - ofs);
269 * \brief Names for channel IOCtl Calls
271 static const char *casIOCtls_Channel[] = {
280 * \brief Channel IOCtls
282 int UDP_Channel_IOCtl(tVFS_Node *Node, int ID, void *Data)
284 tUDPChannel *chan = Node->ImplPtr;
285 ENTER("pNode iID pData", Node, ID, Data);
288 BASE_IOCTLS(DRV_TYPE_MISC, "UDP Channel", 0x100, casIOCtls_Channel);
290 case 4: // getset_localport (returns bool success)
291 if(!Data) LEAVE_RET('i', chan->LocalPort);
292 if(!CheckMem( Data, sizeof(Uint16) ) ) {
293 LOG("Invalid pointer %p", Data);
297 chan->LocalPort = *(Uint16*)Data;
298 // Permissions check (Ports lower than 1024 are root-only)
299 if(chan->LocalPort != 0 && chan->LocalPort < 1024) {
300 if( Threads_GetUID() != 0 ) {
301 LOG("Attempt by non-superuser to listen on port %i", chan->LocalPort);
306 // Allocate a random port if requested
307 if( chan->LocalPort == 0 )
308 chan->LocalPort = UDP_int_AllocatePort();
311 // Else, mark the requested port as used
312 if( UDP_int_MarkPortAsUsed(chan->LocalPort) == 0 ) {
313 LOG("Port %i us currently in use", chan->LocalPort);
321 case 5: // getset_remoteport (returns bool success)
322 if(!Data) LEAVE_RET('i', chan->Remote.Port);
323 if(!CheckMem( Data, sizeof(Uint16) ) ) {
324 LOG("Invalid pointer %p", Data);
327 chan->Remote.Port = *(Uint16*)Data;
330 case 6: // getset_remotemask (returns bool success)
331 if(!Data) LEAVE_RET('i', chan->RemoteMask);
332 if(!CheckMem(Data, sizeof(int))) LEAVE_RET('i', -1);
333 if( !chan->Interface ) {
334 LOG("Can't set remote mask on NULL interface");
337 if( *(int*)Data > IPStack_GetAddressSize(chan->Interface->Type) )
339 chan->RemoteMask = *(int*)Data;
342 case 7: // set_remoteaddr (returns bool success)
343 if( !chan->Interface ) {
344 LOG("Can't set remote address on NULL interface");
347 if(!CheckMem(Data, IPStack_GetAddressSize(chan->Interface->Type))) {
348 LOG("Invalid pointer");
351 memcpy(&chan->Remote.Addr, Data, IPStack_GetAddressSize(chan->Interface->Type));
358 * \brief Close and destroy an open channel
360 void UDP_Channel_Close(tVFS_Node *Node)
362 tUDPChannel *chan = Node->ImplPtr;
365 // Remove from the main list first
366 Mutex_Acquire(&glUDP_Channels);
367 if(gpUDP_Channels == chan)
368 gpUDP_Channels = gpUDP_Channels->Next;
371 for(prev = gpUDP_Channels;
372 prev->Next && prev->Next != chan;
375 Log_Warning("UDP", "Bookeeping Fail, channel %p is not in main list", chan);
377 prev->Next = prev->Next->Next;
379 Mutex_Release(&glUDP_Channels);
382 SHORTLOCK(&chan->lQueue);
387 chan->Queue = tmp->Next;
390 SHORTREL(&chan->lQueue);
392 // Free channel structure
397 * \return Port Number on success, or zero on failure
399 Uint16 UDP_int_AllocatePort()
402 Mutex_Acquire(&glUDP_Ports);
404 for( i = UDP_ALLOC_BASE; i < 0x10000; i += 32 )
405 if( gUDP_Ports[i/32] != 0xFFFFFFFF )
407 if(i == 0x10000) return 0;
410 if( !(gUDP_Ports[i/32] & (1 << (i%32))) )
413 Mutex_Release(&glUDP_Ports);
417 * \brief Allocate a specific port
418 * \return Boolean Success
420 int UDP_int_MarkPortAsUsed(Uint16 Port)
422 Mutex_Acquire(&glUDP_Ports);
423 if( gUDP_Ports[Port/32] & (1 << (Port%32)) ) {
425 Mutex_Release(&glUDP_Ports);
427 gUDP_Ports[Port/32] |= 1 << (Port%32);
428 Mutex_Release(&glUDP_Ports);
433 * \brief Free an allocated port
435 void UDP_int_FreePort(Uint16 Port)
437 Mutex_Acquire(&glUDP_Ports);
438 gUDP_Ports[Port/32] &= ~(1 << (Port%32));
439 Mutex_Release(&glUDP_Ports);