// only called for incoming packets
void TCPProcess(IPSTACK * pIpStack)
{
TCPSOCKET * pSocketCur = NULL;
TCPSOCKET * pSocketListen = NULL;
TCPSOCKET * pSocketExact = NULL;
// see if this is directed to my IP
if( !( // this is not my IP address
// my IPv4 address
(!ILIsIPv6(pIpStack->pLLAdp) && pIpStack->pLLAdp->ipMy.ipv4.u32 == pIpStack->pIPv4Hdr->ipDest.u32)
||
// my IPv6 addresss
(memcmp(&pIpStack->pLLAdp->ipMy.ipv6, &pIpStack->pIPv6Hdr->ipDest, sizeof(IPv6)) == 0) ))
{
// just get out if it is not for me
return;
}
// look at all of the sockets
while((pSocketCur = (TCPSOCKET*)FFNext(&g_ffptActiveTCPSockets, pSocketCur)) != NULL)
{
if( pSocketCur->tcpState > tcpListen &&
pIpStack->pTCPHdr->portPair == pSocketCur->s.portPair &&
// matches the remote IP
((!ILIsIPv6(pIpStack->pLLAdp) && pSocketCur->s.ipRemote.ipv4.u32 == pIpStack->pIPv4Hdr->ipSrc.u32)
||
(memcmp(&pSocketCur->s.ipRemote.ipv6, &pIpStack->pIPv4Hdr->ipSrc, sizeof(IPv6)) == 0)) )
{
pSocketExact = pSocketCur;
break;
}
else if(pSocketCur->tcpState == tcpListen &&
pSocketCur->s.portLocal == pIpStack->pTCPHdr->portDest &&
pIpStack->pTCPHdr->fSyn)
{
pSocketListen = pSocketCur;
}
}
// see if we did not find an exact match
// but we are listening
if(pSocketExact == NULL)
{
pSocketExact = pSocketListen;
}
// a match to an active socket
if(pSocketExact != NULL)
{
IPSUpdateARPEntry(pIpStack);
memcpy(&pSocketExact->s.macRemote, &pIpStack->pFrameII->macSrc, sizeof(MACADDR));
TCPStateMachine(pIpStack, pSocketExact, NULL);
}
// to no socket at all, this will cause a RST to be sent.
else
{
TCPStateMachine(pIpStack, NULL, NULL);
}
}
void UDPProcess(IPSTACK * pIpStack)
{
UDPSOCKET * pSocketCur = NULL;
UDPSOCKET * pSocketListen = NULL;
UDPSOCKET * pSocketAnyRemoteIP = NULL;
UDPSOCKET * pSocketExact = NULL;
bool fBroadcast = false;
bool fMyIP = ILIsIPv6(pIpStack->pLLAdp) ?
ILIsMyIP(pIpStack->pLLAdp, &pIpStack->pIPv6Hdr->ipDest, &fBroadcast) :
ILIsMyIP(pIpStack->pLLAdp, &pIpStack->pIPv4Hdr->ipDest, &fBroadcast);
// see if this is directed to my IP
if( !fMyIP )
{
return;
}
// look at all listening sockets to see if the ports and remote IP match
while((pSocketCur = FFNext(&g_ffptListeningUDPSockets, pSocketCur)) != NULL)
{
// make sure we have consistant IPs
if(ILIsIPv6(pSocketCur->s.pLLAdp) == ILIsIPv6(pIpStack->pLLAdp))
{
// listening socket, only check local port, remote port/IP will be set
if( pSocketCur->s.portRemote == portListen &&
pSocketCur->s.portLocal == pIpStack->pUDPHdr->portDest )
{
pSocketListen = pSocketCur;
}
// all connected sockets
else if(pIpStack->pUDPHdr->portPair == pSocketCur->s.portPair)
{
// this is an IPv4 address
if(!ILIsIPv6(pIpStack->pLLAdp))
{
// exact match
if(pSocketCur->s.ipRemote.ipv4.u32 == pIpStack->pIPv4Hdr->ipSrc.u32)
{
pSocketExact = pSocketCur;
break;
}
// this is only supported for DHCP IPv4
else if(pSocketCur->s.ipRemote.ipv4.u32 == UDPAnyRemoteIPv4.u32)
{
pSocketAnyRemoteIP = pSocketCur;
}
}
// else an IPv6 address
else
{
// exact match
if(memcmp(&pSocketCur->s.ipRemote.ipv6, &pIpStack->pIPv6Hdr->ipSrc, sizeof(IPv6)) == 0)
{
pSocketExact = pSocketCur;
break;
}
}
}
}
}
// a match to an active socket
if(pSocketExact == NULL)
{
if(pSocketAnyRemoteIP != NULL)
{
pSocketExact = pSocketAnyRemoteIP;
}
else if(pSocketListen != NULL)
{
pSocketExact = pSocketListen;
pSocketExact->s.portRemote = pIpStack->pUDPHdr->portSrc;
if(ILIsIPv6(pSocketExact->s.pLLAdp))
{
memcpy(&pSocketExact->s.ipRemote.ipv6, &pIpStack->pIPv6Hdr->ipSrc, sizeof(IPv6));
}
else
{
pSocketExact->s.ipRemote.ipv4.u32 = pIpStack->pIPv4Hdr->ipSrc.u32;
}
}
}
// no match to anything, get out.
if(pSocketExact == NULL)
{
return;
}
// update our ARP table
IPSUpdateARPEntry(pIpStack);
memcpy(&pSocketExact->s.macRemote, &pIpStack->pFrameII->macSrc, sizeof(MACADDR));
// Receive the UDP input data
UDPProcessRx(pIpStack, pSocketExact);
}
