// === PROTOTYPES ===
void UDP_Initialise();
void UDP_GetPacket(tInterface *Interface, void *Address, int Length, void *Buffer);
-void UDP_Unreachable(tInterface *Interface, int Code, void *Address, int Length, void *Buffer);
+void UDP_IPError(tInterface *Interface, tIPErrorMode Code, const void *Address, int Length, const void *Buffer);
void UDP_SendPacketTo(tUDPChannel *Channel, int AddrType, const void *Address, Uint16 Port, const void *Data, size_t Length);
// --- Client Channels
tVFS_Node *UDP_Channel_Init(tInterface *Interface);
Uint16 UDP_int_AllocatePort(tUDPChannel *Channel);
int UDP_int_ClaimPort(tUDPChannel *Channel, Uint16 Port);
void UDP_int_FreePort(Uint16 Port);
+Uint16 UDP_int_MakeChecksum(tInterface *Iface, const void *Dest, tUDPHeader *Hdr, size_t Len, const void *Data);
+Uint16 UDP_int_PartialChecksum(Uint16 Prev, size_t Len, const void *Data);
+Uint16 UDP_int_FinaliseChecksum(Uint16 Value);
// === GLOBALS ===
tVFS_NodeType gUDP_NodeType = {
+ .TypeName = "UDP",
+ .Flags = VFS_NODETYPEFLAG_STREAM,
.Read = UDP_Channel_Read,
.Write = UDP_Channel_Write,
.IOCtl = UDP_Channel_IOCtl,
.Close = UDP_Channel_Close
};
-tMutex glUDP_Channels;
+tMutex glUDP_Channels; // TODO: Replace with a RWLock
tUDPChannel *gpUDP_Channels;
tMutex glUDP_Ports;
void UDP_Initialise()
{
IPStack_AddFile(&gUDP_SocketFile);
- //IPv4_RegisterCallback(IP4PROT_UDP, UDP_GetPacket, UDP_Unreachable);
- IPv4_RegisterCallback(IP4PROT_UDP, UDP_GetPacket);
+ IPv4_RegisterCallback(IP4PROT_UDP, UDP_GetPacket, UDP_IPError);
}
/**
int UDP_int_ScanList(tUDPChannel *List, tInterface *Interface, void *Address, int Length, void *Buffer)
{
tUDPHeader *hdr = Buffer;
- tUDPChannel *chan;
- tUDPPacket *pack;
- int len;
- for(chan = List; chan; chan = chan->Next)
+ for(tUDPChannel *chan = List; chan; chan = chan->Next)
{
// Match local endpoint
+ LOG("(%p):%i - %s/%i:%i",
+ chan->Interface, chan->LocalPort,
+ IPStack_PrintAddress(chan->Remote.AddrType, &chan->Remote.Addr), chan->RemoteMask,
+ chan->Remote.Port
+ );
if(chan->Interface && chan->Interface != Interface) continue;
if(chan->LocalPort != ntohs(hdr->DestPort)) continue;
Log_Log("UDP", "Recieved packet for %p", chan);
// Create the cached packet
- len = ntohs(hdr->Length);
- pack = malloc(sizeof(tUDPPacket) + len);
+ int len = ntohs(hdr->Length);
+ tUDPPacket *pack = malloc(sizeof(tUDPPacket) + len);
pack->Next = NULL;
memcpy(&pack->Remote.Addr, Address, IPStack_GetAddressSize(Interface->Type));
pack->Remote.Port = ntohs(hdr->SourcePort);
{
tUDPHeader *hdr = Buffer;
- Log_Debug("UDP", "%i bytes :%i->:%i (Cksum 0x%04x)",
- ntohs(hdr->Length), ntohs(hdr->SourcePort), ntohs(hdr->Length), ntohs(hdr->Checksum));
+ #if 1
+ size_t len = strlen( IPStack_PrintAddress(Interface->Type, Address) );
+ char tmp[len+1];
+ strcpy(tmp, IPStack_PrintAddress(Interface->Type, Address));
+ Log_Debug("UDP", "%i bytes %s:%i -> %s:%i (Cksum 0x%04x)",
+ ntohs(hdr->Length),
+ tmp, ntohs(hdr->SourcePort),
+ IPStack_PrintAddress(Interface->Type, Interface->Address), ntohs(hdr->DestPort),
+ ntohs(hdr->Checksum));
+ #endif
// Check registered connections
Mutex_Acquire(&glUDP_Channels);
/**
* \brief Handle an ICMP Unrechable Error
*/
-void UDP_Unreachable(tInterface *Interface, int Code, void *Address, int Length, void *Buffer)
+void UDP_IPError(tInterface *Interface, tIPErrorMode Code, const void *Address, int Length, const void *Buffer)
{
}
{
tUDPHeader hdr;
- if(Channel->Interface && Channel->Interface->Type != AddrType) return ;
+ if(Channel->Interface && Channel->Interface->Type != AddrType) {
+ LOG("Bad interface type for channel packet, IF is %i, but packet is %i",
+ Channel->Interface->Type, AddrType);
+ return ;
+ }
+
+ // Create the packet
+ hdr.SourcePort = htons( Channel->LocalPort );
+ hdr.DestPort = htons( Port );
+ hdr.Length = htons( sizeof(tUDPHeader) + Length );
+ hdr.Checksum = 0;
+ hdr.Checksum = htons( UDP_int_MakeChecksum(Channel->Interface, Address, &hdr, Length, Data) );
+ tIPStackBuffer *buffer;
switch(AddrType)
{
case 4:
- // Create the packet
- hdr.SourcePort = htons( Channel->LocalPort );
- hdr.DestPort = htons( Port );
- hdr.Length = htons( sizeof(tUDPHeader) + Length );
- hdr.Checksum = 0; // Checksum can be zero on IPv4
// Pass on the the IPv4 Layer
- tIPStackBuffer *buffer = IPStack_Buffer_CreateBuffer(2 + IPV4_BUFFERS);
+ buffer = IPStack_Buffer_CreateBuffer(2 + IPV4_BUFFERS);
IPStack_Buffer_AppendSubBuffer(buffer, Length, 0, Data, NULL, NULL);
IPStack_Buffer_AppendSubBuffer(buffer, sizeof(hdr), 0, &hdr, NULL, NULL);
// TODO: What if Channel->Interface is NULL here?
+ ASSERT(Channel->Interface);
IPv4_SendPacket(Channel->Interface, *(tIPv4*)Address, IP4PROT_UDP, 0, buffer);
- IPStack_Buffer_DestroyBuffer(buffer);
+ break;
+ default:
+ Log_Warning("UDP", "TODO: Implement on proto %i", AddrType);
break;
}
}
tUDPChannel *new;
new = calloc( sizeof(tUDPChannel), 1 );
new->Interface = Interface;
+ new->Node.Size = -1;
new->Node.ImplPtr = new;
new->Node.NumACLs = 1;
new->Node.ACLs = &gVFS_ACL_EveryoneRW;
return &new->Node;
}
-/**
- * \brief Read from the channel file (wait for a packet)
- */
-size_t UDP_Channel_Read(tVFS_Node *Node, off_t Offset, size_t Length, void *Buffer, Uint Flags)
+tUDPPacket *UDP_Channel_WaitForPacket(tUDPChannel *chan, Uint VFSFlags)
{
- tUDPChannel *chan = Node->ImplPtr;
- tUDPPacket *pack;
- tUDPEndpoint *ep;
- int ofs, addrlen;
-
- if(chan->LocalPort == 0) {
- Log_Notice("UDP", "Channel %p sent with no local port", chan);
- return 0;
- }
-
- while(chan->Queue == NULL) Threads_Yield();
+ // EVIL - Yield until queue is created (avoids races)
+ while(chan->Queue == NULL)
+ Threads_Yield();
for(;;)
{
- tTime timeout_z = 0, *timeout = (Flags & VFS_IOFLAG_NOBLOCK) ? &timeout_z : NULL;
- int rv = VFS_SelectNode(Node, VFS_SELECT_READ, timeout, "UDP_Channel_Read");
- if( rv ) {
- errno = (Flags & VFS_IOFLAG_NOBLOCK) ? EWOULDBLOCK : EINTR;
+ tTime timeout_z = 0, *timeout = (VFSFlags & VFS_IOFLAG_NOBLOCK) ? &timeout_z : NULL;
+ int rv = VFS_SelectNode(&chan->Node, VFS_SELECT_READ, timeout, "UDP_Channel_Read");
+ if( rv == 0 ) {
+ errno = (VFSFlags & VFS_IOFLAG_NOBLOCK) ? EWOULDBLOCK : EINTR;
+ return NULL;
}
SHORTLOCK(&chan->lQueue);
if(chan->Queue == NULL) {
SHORTREL(&chan->lQueue);
continue;
}
- pack = chan->Queue;
+ tUDPPacket *pack = chan->Queue;
chan->Queue = pack->Next;
if(!chan->Queue) {
chan->QueueEnd = NULL;
- VFS_MarkAvaliable(Node, 0); // Nothing left
+ VFS_MarkAvaliable(&chan->Node, 0); // Nothing left
}
SHORTREL(&chan->lQueue);
- break;
+ return pack;
+ }
+ // Unreachable
+}
+
+/**
+ * \brief Read from the channel file (wait for a packet)
+ */
+size_t UDP_Channel_Read(tVFS_Node *Node, off_t Offset, size_t Length, void *Buffer, Uint Flags)
+{
+ tUDPChannel *chan = Node->ImplPtr;
+
+ if(chan->LocalPort == 0) {
+ Log_Notice("UDP", "Channel %p sent with no local port", chan);
+ return 0;
+ }
+
+ tUDPPacket *pack = UDP_Channel_WaitForPacket(chan, Flags);
+ if( !pack ) {
+ return 0;
}
+ size_t addrlen = IPStack_GetAddressSize(pack->Remote.AddrType);
+ tUDPEndpoint *ep = Buffer;
+ size_t ofs = 4 + addrlen;
+
// Check that the header fits
- addrlen = IPStack_GetAddressSize(pack->Remote.AddrType);
- ep = Buffer;
- ofs = 4 + addrlen;
if(Length < ofs) {
free(pack);
Log_Notice("UDP", "Insuficient space for header in buffer (%i < %i)", (int)Length, ofs);
"getset_remoteport",
"getset_remotemask",
"set_remoteaddr",
+ "sendto",
+ "recvfrom",
NULL
};
/**
case 6: // getset_remotemask (returns bool success)
if(!Data) LEAVE_RET('i', chan->RemoteMask);
- if(!CheckMem(Data, sizeof(int))) LEAVE_RET('i', -1);
+ if(!CheckMem(Data, sizeof(int))) {
+ LOG("Data pointer invalid");
+ LEAVE_RET('i', -1);
+ }
if( !chan->Interface ) {
LOG("Can't set remote mask on NULL interface");
LEAVE_RET('i', -1);
}
- if( *(int*)Data > IPStack_GetAddressSize(chan->Interface->Type) )
+ int mask = *(int*)Data;
+ int addr_bits = IPStack_GetAddressSize(chan->Interface->Type) * 8;
+ if( mask > addr_bits ) {
+ LOG("Mask too large (%i > max %i)", mask, addr_bits);
LEAVE_RET('i', -1);
- chan->RemoteMask = *(int*)Data;
+ }
+ chan->RemoteMask = mask;
LEAVE('i', chan->RemoteMask);
return chan->RemoteMask;
LOG("Invalid pointer");
LEAVE_RET('i', -1);
}
+ LOG("Set remote addr %s", IPStack_PrintAddress(chan->Interface->Type, Data));
+ chan->Remote.AddrType = chan->Interface->Type;
memcpy(&chan->Remote.Addr, Data, IPStack_GetAddressSize(chan->Interface->Type));
LEAVE('i', 0);
return 0;
+ case 8: { // sendto
+ if(!CheckMem(Data, 2*sizeof(void*)+2)) {
+ LOG("Data pointer invalid");
+ LEAVE_RET('i', -1);
+ }
+ const struct sSendToArgs {
+ const tUDPEndpoint* ep;
+ const void* buf;
+ const Uint16 buflen;
+ } info = *(const struct sSendToArgs*)Data;
+ LOG("sendto(buf=%p + %u, ep=%p)", info.buf, info.buflen, info.ep);
+ if(!CheckMem(info.ep, 2+2) || !CheckMem(info.ep, 2+2+IPStack_GetAddressSize(info.ep->AddrType)) ) {
+ LEAVE_RET('i', -1);
+ }
+ if(!CheckMem(info.buf, info.buflen)) {
+ LEAVE_RET('i', -1);
+ }
+
+ UDP_SendPacketTo(chan, info.ep->AddrType, &info.ep->Addr, info.ep->Port,
+ info.buf, (size_t)info.buflen);
+
+ LEAVE_RET('i', info.buflen); }
+ case 9: { // recvfrom
+ if(!CheckMem(Data, 2*sizeof(void*)+2)) {
+ LOG("Data pointer invalid");
+ LEAVE_RET('i', -1);
+ }
+ const struct sRecvFromArgs {
+ tUDPEndpoint* ep;
+ void* buf;
+ Uint16 buflen;
+ } info = *(const struct sRecvFromArgs*)Data;
+ LOG("recvfrom(buf=%p + %u, ep=%p)", info.buf, info.buflen, info.ep);
+ if(!CheckMem(info.ep, 2+2)) {
+ LEAVE_RET('i', -1);
+ }
+ if(!CheckMem(info.buf, info.buflen)) {
+ LEAVE_RET('i', -1);
+ }
+
+ tUDPPacket *pack = UDP_Channel_WaitForPacket(chan, 0);
+ if( pack == NULL ) {
+ LOG("No packet");
+ LEAVE_RET('i', 0);
+ }
+
+ size_t addrsize = IPStack_GetAddressSize(pack->Remote.AddrType);
+ if( !CheckMem(info.ep, 2+2+addrsize) ) {
+ LOG("Insufficient space for source address");
+ free(pack);
+ LEAVE_RET('i', -1);
+ }
+ info.ep->Port = pack->Remote.Port;
+ info.ep->AddrType = pack->Remote.AddrType;
+ memcpy(&info.ep->Addr, &pack->Remote.Addr, addrsize);
+
+ size_t retlen = (info.buflen < pack->Length ? info.buflen : pack->Length);
+ memcpy(info.buf, pack->Data, retlen);
+
+ free(pack);
+
+ LEAVE_RET('i', retlen); }
}
LEAVE_RET('i', 0);
}
gUDP_Ports[Port/32] &= ~(1 << (Port%32));
Mutex_Release(&glUDP_Ports);
}
+
+/**
+ *
+ */
+Uint16 UDP_int_MakeChecksum(tInterface *Interface, const void *Dest, tUDPHeader *Hdr, size_t Len, const void *Data)
+{
+ size_t addrsize = IPStack_GetAddressSize(Interface->Type);
+ struct {
+ Uint8 Zeroes;
+ Uint8 Protocol;
+ Uint16 UDPLength;
+ } pheader;
+
+ pheader.Zeroes = 0;
+ switch(Interface->Type)
+ {
+ case 4: pheader.Protocol = IP4PROT_UDP; break;
+ //case 6: pheader.Protocol = IP6PROT_UDP; break;
+ default:
+ Log_Warning("UDP", "Unimplemented _MakeChecksum proto %i", Interface->Type);
+ return 0;
+ }
+ pheader.UDPLength = Hdr->Length;
+
+ Uint16 csum = 0;
+ csum = UDP_int_PartialChecksum(csum, addrsize, Interface->Address);
+ csum = UDP_int_PartialChecksum(csum, addrsize, Dest);
+ csum = UDP_int_PartialChecksum(csum, sizeof(pheader), &pheader);
+ csum = UDP_int_PartialChecksum(csum, sizeof(tUDPHeader), Hdr);
+ csum = UDP_int_PartialChecksum(csum, Len, Data);
+
+ return UDP_int_FinaliseChecksum(csum);
+}
+
+static inline Uint16 _add_ones_complement16(Uint16 a, Uint16 b)
+{
+ // One's complement arithmatic, overflows increment bottom bit
+ return a + b + (b > 0xFFFF - a ? 1 : 0);
+}
+
+Uint16 UDP_int_PartialChecksum(Uint16 Prev, size_t Len, const void *Data)
+{
+ Uint16 ret = Prev;
+ const Uint16 *data = Data;
+ for( int i = 0; i < Len/2; i ++ )
+ ret = _add_ones_complement16(ret, htons(*data++));
+ if( Len % 2 == 1 )
+ ret = _add_ones_complement16(ret, htons(*(const Uint8*)data));
+ return ret;
+}
+
+Uint16 UDP_int_FinaliseChecksum(Uint16 Value)
+{
+ Value = ~Value; // One's complement it
+ return (Value == 0 ? 0xFFFF : Value);
+}