/**
NewReno fast recovery, RFC3782.
@param Tcb Pointer to the TCP_CB of this TCP instance.
@param Seg Segment that triggers the fast recovery.
**/
VOID
TcpFastRecover (
IN OUT TCP_CB *Tcb,
IN TCP_SEG *Seg
)
{
UINT32 FlightSize;
UINT32 Acked;
//
// Step 1: Three duplicate ACKs and not in fast recovery
//
if (Tcb->CongestState != TCP_CONGEST_RECOVER) {
//
// Step 1A: Invoking fast retransmission.
//
FlightSize = TCP_SUB_SEQ (Tcb->SndNxt, Tcb->SndUna);
Tcb->Ssthresh = MAX (FlightSize >> 1, (UINT32) (2 * Tcb->SndMss));
Tcb->Recover = Tcb->SndNxt;
Tcb->CongestState = TCP_CONGEST_RECOVER;
TCP_CLEAR_FLG (Tcb->CtrlFlag, TCP_CTRL_RTT_ON);
//
// Step 2: Entering fast retransmission
//
TcpRetransmit (Tcb, Tcb->SndUna);
Tcb->CWnd = Tcb->Ssthresh + 3 * Tcb->SndMss;
DEBUG ((EFI_D_INFO, "TcpFastRecover: enter fast retransmission"
" for TCB %p, recover point is %d\n", Tcb, Tcb->Recover));
return;
}
/**
Timeout handler for TCP retransmission timer.
@param Tcb Pointer to the TCP_CB of this TCP instance.
**/
VOID
TcpRexmitTimeout (
IN OUT TCP_CB *Tcb
)
{
UINT32 FlightSize;
DEBUG ((EFI_D_WARN, "TcpRexmitTimeout: transmission "
"timeout for TCB %p\n", Tcb));
//
// Set the congestion window. FlightSize is the
// amount of data that has been sent but not
// yet ACKed.
//
FlightSize = TCP_SUB_SEQ (Tcb->SndNxt, Tcb->SndUna);
Tcb->Ssthresh = MAX ((UINT32) (2 * Tcb->SndMss), FlightSize / 2);
Tcb->CWnd = Tcb->SndMss;
Tcb->LossRecover = Tcb->SndNxt;
Tcb->LossTimes++;
if ((Tcb->LossTimes > Tcb->MaxRexmit) &&
!TCP_TIMER_ON (Tcb->EnabledTimer, TCP_TIMER_CONNECT)) {
DEBUG ((EFI_D_ERROR, "TcpRexmitTimeout: connection closed "
"because too many timeouts for TCB %p\n", Tcb));
if (EFI_ABORTED == Tcb->Sk->SockError) {
SOCK_ERROR (Tcb->Sk, EFI_TIMEOUT);
}
TcpClose (Tcb);
return ;
}
TcpBackoffRto (Tcb);
TcpRetransmit (Tcb, Tcb->SndUna);
TcpSetTimer (Tcb, TCP_TIMER_REXMIT, Tcb->Rto);
Tcb->CongestState = TCP_CONGEST_LOSS;
TCP_CLEAR_FLG (Tcb->CtrlFlag, TCP_CTRL_RTT_ON);
}
/**
Update the timer status and the next expire time according to the timers
to expire in a specific future time slot.
@param Tcb Pointer to the TCP_CB of this TCP instance.
**/
VOID
TcpUpdateTimer (
IN OUT TCP_CB *Tcb
)
{
UINT16 Index;
//
// Don't use a too large value to init NextExpire
// since mTcpTick wraps around as sequence no does.
//
Tcb->NextExpire = 65535;
TCP_CLEAR_FLG (Tcb->CtrlFlag, TCP_CTRL_TIMER_ON);
for (Index = 0; Index < TCP_TIMER_NUMBER; Index++) {
if (TCP_TIMER_ON (Tcb->EnabledTimer, Index) &&
TCP_TIME_LT (Tcb->Timer[Index], mTcpTick + Tcb->NextExpire)) {
Tcb->NextExpire = TCP_SUB_TIME (Tcb->Timer[Index], mTcpTick);
TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_TIMER_ON);
}
}
}
/**
Configure the Pcb using CfgData.
@param Sk Pointer to the socket of this TCP instance.
@param CfgData Pointer to the TCP configuration data.
@retval EFI_SUCCESS The operation is completed successfully.
@retval EFI_INVALID_PARAMETER A same access point has been configured in
another TCP instance.
@retval EFI_OUT_OF_RESOURCES Failed due to resource limit.
**/
EFI_STATUS
Tcp4ConfigurePcb (
IN SOCKET *Sk,
IN EFI_TCP4_CONFIG_DATA *CfgData
)
{
EFI_IP4_CONFIG_DATA IpCfgData;
EFI_STATUS Status;
EFI_TCP4_OPTION *Option;
TCP4_PROTO_DATA *TcpProto;
TCP_CB *Tcb;
ASSERT ((CfgData != NULL) && (Sk != NULL) && (Sk->SockHandle != NULL));
TcpProto = (TCP4_PROTO_DATA *) Sk->ProtoReserved;
Tcb = TcpProto->TcpPcb;
ASSERT (Tcb != NULL);
//
// Add Ip for send pkt to the peer
//
CopyMem (&IpCfgData, &mIp4IoDefaultIpConfigData, sizeof (IpCfgData));
IpCfgData.DefaultProtocol = EFI_IP_PROTO_TCP;
IpCfgData.UseDefaultAddress = CfgData->AccessPoint.UseDefaultAddress;
IpCfgData.StationAddress = CfgData->AccessPoint.StationAddress;
IpCfgData.SubnetMask = CfgData->AccessPoint.SubnetMask;
IpCfgData.ReceiveTimeout = (UINT32) (-1);
//
// Configure the IP instance this Tcb consumes.
//
Status = IpIoConfigIp (Tcb->IpInfo, &IpCfgData);
if (EFI_ERROR (Status)) {
goto OnExit;
}
//
// Get the default address info if the instance is configured to use default address.
//
if (CfgData->AccessPoint.UseDefaultAddress) {
CfgData->AccessPoint.StationAddress = IpCfgData.StationAddress;
CfgData->AccessPoint.SubnetMask = IpCfgData.SubnetMask;
}
//
// check if we can bind this endpoint in CfgData
//
Status = Tcp4Bind (&(CfgData->AccessPoint));
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR, "Tcp4ConfigurePcb: Bind endpoint failed "
"with %r\n", Status));
goto OnExit;
}
//
// Initalize the operating information in this Tcb
//
ASSERT (Tcb->State == TCP_CLOSED &&
IsListEmpty (&Tcb->SndQue) &&
IsListEmpty (&Tcb->RcvQue));
TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_NO_KEEPALIVE);
Tcb->State = TCP_CLOSED;
Tcb->SndMss = 536;
Tcb->RcvMss = TcpGetRcvMss (Sk);
Tcb->SRtt = 0;
Tcb->Rto = 3 * TCP_TICK_HZ;
Tcb->CWnd = Tcb->SndMss;
Tcb->Ssthresh = 0xffffffff;
Tcb->CongestState = TCP_CONGEST_OPEN;
Tcb->KeepAliveIdle = TCP_KEEPALIVE_IDLE_MIN;
Tcb->KeepAlivePeriod = TCP_KEEPALIVE_PERIOD;
Tcb->MaxKeepAlive = TCP_MAX_KEEPALIVE;
Tcb->MaxRexmit = TCP_MAX_LOSS;
Tcb->FinWait2Timeout = TCP_FIN_WAIT2_TIME;
Tcb->TimeWaitTimeout = TCP_TIME_WAIT_TIME;
Tcb->ConnectTimeout = TCP_CONNECT_TIME;
//
// initialize Tcb in the light of CfgData
//
Tcb->Ttl = CfgData->TimeToLive;
Tcb->Tos = CfgData->TypeOfService;
Tcb->UseDefaultAddr = CfgData->AccessPoint.UseDefaultAddress;
CopyMem (&Tcb->LocalEnd.Ip, &CfgData->AccessPoint.StationAddress, sizeof (IP4_ADDR));
Tcb->LocalEnd.Port = HTONS (CfgData->AccessPoint.StationPort);
IP4_COPY_ADDRESS (&Tcb->SubnetMask, &CfgData->AccessPoint.SubnetMask);
if (CfgData->AccessPoint.ActiveFlag) {
CopyMem (&Tcb->RemoteEnd.Ip, &CfgData->AccessPoint.RemoteAddress, sizeof (IP4_ADDR));
Tcb->RemoteEnd.Port = HTONS (CfgData->AccessPoint.RemotePort);
} else {
Tcb->RemoteEnd.Ip = 0;
Tcb->RemoteEnd.Port = 0;
}
Option = CfgData->ControlOption;
if (Option != NULL) {
SET_RCV_BUFFSIZE (
Sk,
(UINT32) (TCP_COMP_VAL (
TCP_RCV_BUF_SIZE_MIN,
TCP_RCV_BUF_SIZE,
TCP_RCV_BUF_SIZE,
Option->ReceiveBufferSize
)
)
);
SET_SND_BUFFSIZE (
Sk,
(UINT32) (TCP_COMP_VAL (
TCP_SND_BUF_SIZE_MIN,
TCP_SND_BUF_SIZE,
TCP_SND_BUF_SIZE,
Option->SendBufferSize
)
)
);
SET_BACKLOG (
Sk,
(UINT32) (TCP_COMP_VAL (
TCP_BACKLOG_MIN,
TCP_BACKLOG,
TCP_BACKLOG,
Option->MaxSynBackLog
)
)
);
Tcb->MaxRexmit = (UINT16) TCP_COMP_VAL (
TCP_MAX_LOSS_MIN,
TCP_MAX_LOSS,
TCP_MAX_LOSS,
Option->DataRetries
);
Tcb->FinWait2Timeout = TCP_COMP_VAL (
TCP_FIN_WAIT2_TIME,
TCP_FIN_WAIT2_TIME_MAX,
TCP_FIN_WAIT2_TIME,
(UINT32) (Option->FinTimeout * TCP_TICK_HZ)
);
if (Option->TimeWaitTimeout != 0) {
Tcb->TimeWaitTimeout = TCP_COMP_VAL (
TCP_TIME_WAIT_TIME,
TCP_TIME_WAIT_TIME_MAX,
TCP_TIME_WAIT_TIME,
(UINT32) (Option->TimeWaitTimeout * TCP_TICK_HZ)
);
} else {
Tcb->TimeWaitTimeout = 0;
}
if (Option->KeepAliveProbes != 0) {
TCP_CLEAR_FLG (Tcb->CtrlFlag, TCP_CTRL_NO_KEEPALIVE);
Tcb->MaxKeepAlive = (UINT8) TCP_COMP_VAL (
TCP_MAX_KEEPALIVE_MIN,
TCP_MAX_KEEPALIVE,
TCP_MAX_KEEPALIVE,
Option->KeepAliveProbes
);
Tcb->KeepAliveIdle = TCP_COMP_VAL (
TCP_KEEPALIVE_IDLE_MIN,
TCP_KEEPALIVE_IDLE_MAX,
TCP_KEEPALIVE_IDLE_MIN,
(UINT32) (Option->KeepAliveTime * TCP_TICK_HZ)
);
Tcb->KeepAlivePeriod = TCP_COMP_VAL (
TCP_KEEPALIVE_PERIOD_MIN,
TCP_KEEPALIVE_PERIOD,
TCP_KEEPALIVE_PERIOD,
(UINT32) (Option->KeepAliveInterval * TCP_TICK_HZ)
);
}
Tcb->ConnectTimeout = TCP_COMP_VAL (
TCP_CONNECT_TIME_MIN,
TCP_CONNECT_TIME,
TCP_CONNECT_TIME,
(UINT32) (Option->ConnectionTimeout * TCP_TICK_HZ)
);
if (!Option->EnableNagle) {
TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_NO_NAGLE);
}
if (!Option->EnableTimeStamp) {
TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_NO_TS);
}
if (!Option->EnableWindowScaling) {
TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_NO_WS);
}
}
//
// The socket is bound, the <SrcIp, SrcPort, DstIp, DstPort> is
// determined, construct the IP device path and install it.
//
Status = TcpInstallDevicePath (Sk);
if (EFI_ERROR (Status)) {
goto OnExit;
}
//
// update state of Tcb and socket
//
if (!CfgData->AccessPoint.ActiveFlag) {
TcpSetState (Tcb, TCP_LISTEN);
SockSetState (Sk, SO_LISTENING);
Sk->ConfigureState = SO_CONFIGURED_PASSIVE;
} else {
Sk->ConfigureState = SO_CONFIGURED_ACTIVE;
}
TcpInsertTcb (Tcb);
OnExit:
return Status;
}
