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/** @file
TCP protocol header file.
Copyright (c) 2009 - 2017, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef _TCP_PROTO_H_
#define _TCP_PROTO_H_
///
/// Tcp states don't change their order. It is used as an
/// index to mTcpOutFlag and other macros.
///
#define TCP_CLOSED 0
#define TCP_LISTEN 1
#define TCP_SYN_SENT 2
#define TCP_SYN_RCVD 3
#define TCP_ESTABLISHED 4
#define TCP_FIN_WAIT_1 5
#define TCP_FIN_WAIT_2 6
#define TCP_CLOSING 7
#define TCP_TIME_WAIT 8
#define TCP_CLOSE_WAIT 9
#define TCP_LAST_ACK 10
///
/// Flags in the TCP header
///
#define TCP_FLG_FIN 0x01
#define TCP_FLG_SYN 0x02
#define TCP_FLG_RST 0x04
#define TCP_FLG_PSH 0x08
#define TCP_FLG_ACK 0x10
#define TCP_FLG_URG 0x20
//
// mask for all the flags
//
#define TCP_FLG_FLAG 0x3F
#define TCP_CONNECT_REFUSED (-1) ///< TCP error status
#define TCP_CONNECT_RESET (-2) ///< TCP error status
#define TCP_CONNECT_CLOSED (-3) ///< TCP error status
//
// Current congestion status as suggested by RFC3782.
//
#define TCP_CONGEST_RECOVER 1 ///< During the NewReno fast recovery.
#define TCP_CONGEST_LOSS 2 ///< Retxmit because of retxmit time out.
#define TCP_CONGEST_OPEN 3 ///< TCP is opening its congestion window.
//
// TCP control flags
//
#define TCP_CTRL_NO_NAGLE 0x0001 ///< Disable Nagle algorithm
#define TCP_CTRL_NO_KEEPALIVE 0x0002 ///< Disable keepalive timer.
#define TCP_CTRL_NO_WS 0x0004 ///< Disable window scale option.
#define TCP_CTRL_RCVD_WS 0x0008 ///< Received a wnd scale option in syn.
#define TCP_CTRL_NO_TS 0x0010 ///< Disable Timestamp option.
#define TCP_CTRL_RCVD_TS 0x0020 ///< Received a Timestamp option in syn.
#define TCP_CTRL_SND_TS 0x0040 ///< Send Timestamp option to remote.
#define TCP_CTRL_SND_URG 0x0080 ///< In urgent send mode.
#define TCP_CTRL_RCVD_URG 0x0100 ///< In urgent receive mode.
#define TCP_CTRL_SND_PSH 0x0200 ///< In PUSH send mode.
#define TCP_CTRL_FIN_SENT 0x0400 ///< FIN is sent.
#define TCP_CTRL_FIN_ACKED 0x0800 ///< FIN is ACKed.
#define TCP_CTRL_TIMER_ON 0x1000 ///< At least one of the timer is on.
#define TCP_CTRL_RTT_ON 0x2000 ///< The RTT measurement is on.
#define TCP_CTRL_ACK_NOW 0x4000 ///< Send the ACK now, don't delay.
//
// Timer related values
//
#define TCP_TIMER_CONNECT 0 ///< Connection establishment timer.
#define TCP_TIMER_REXMIT 1 ///< Retransmit timer.
#define TCP_TIMER_PROBE 2 ///< Window probe timer.
#define TCP_TIMER_KEEPALIVE 3 ///< Keepalive timer.
#define TCP_TIMER_FINWAIT2 4 ///< FIN_WAIT_2 timer.
#define TCP_TIMER_2MSL 5 ///< TIME_WAIT timer.
#define TCP_TIMER_NUMBER 6 ///< The total number of the TCP timer.
#define TCP_TICK 200 ///< Every TCP tick is 200ms.
#define TCP_TICK_HZ 5 ///< The frequence of TCP tick.
#define TCP_RTT_SHIFT 3 ///< SRTT & RTTVAR scaled by 8.
#define TCP_RTO_MIN TCP_TICK_HZ ///< The minimum value of RTO.
#define TCP_RTO_MAX (TCP_TICK_HZ * 60) ///< The maximum value of RTO.
#define TCP_FOLD_RTT 4 ///< Timeout threshold to fold RTT.
//
// Default values for some timers
//
#define TCP_MAX_LOSS 12 ///< Default max times to retxmit.
#define TCP_KEEPALIVE_IDLE_MIN (TCP_TICK_HZ * 60 * 60 * 2) ///< First keepalive.
#define TCP_KEEPALIVE_PERIOD (TCP_TICK_HZ * 60)
#define TCP_MAX_KEEPALIVE 8
#define TCP_FIN_WAIT2_TIME (2 * TCP_TICK_HZ)
#define TCP_TIME_WAIT_TIME (2 * TCP_TICK_HZ)
#define TCP_PAWS_24DAY (24 * 24 * 60 * 60 * TCP_TICK_HZ)
#define TCP_CONNECT_TIME (75 * TCP_TICK_HZ)
//
// The header space to be reserved before TCP data to accommodate:
// 60byte IP head + 60byte TCP head + link layer head
//
#define TCP_MAX_HEAD 192
//
// Value ranges for some control option
//
#define TCP_RCV_BUF_SIZE (2 * 1024 * 1024)
#define TCP_RCV_BUF_SIZE_MIN (8 * 1024)
#define TCP_SND_BUF_SIZE (2 * 1024 * 1024)
#define TCP_SND_BUF_SIZE_MIN (8 * 1024)
#define TCP_BACKLOG 10
#define TCP_BACKLOG_MIN 5
#define TCP_MAX_LOSS_MIN 6
#define TCP_CONNECT_TIME_MIN (60 * TCP_TICK_HZ)
#define TCP_MAX_KEEPALIVE_MIN 4
#define TCP_KEEPALIVE_IDLE_MAX (TCP_TICK_HZ * 60 * 60 * 4)
#define TCP_KEEPALIVE_PERIOD_MIN (TCP_TICK_HZ * 30)
#define TCP_FIN_WAIT2_TIME_MAX (4 * TCP_TICK_HZ)
#define TCP_TIME_WAIT_TIME_MAX (60 * TCP_TICK_HZ)
///
/// TCP_CONNECTED: both ends have synchronized their ISN.
///
#define TCP_CONNECTED(state) ((state) > TCP_SYN_RCVD)
#define TCP_FIN_RCVD(State) \
( \
((State) == TCP_CLOSE_WAIT) || \
((State) == TCP_LAST_ACK) || \
((State) == TCP_CLOSING) || \
((State) == TCP_TIME_WAIT) \
)
#define TCP_LOCAL_CLOSED(State) \
( \
((State) == TCP_FIN_WAIT_1) || \
((State) == TCP_FIN_WAIT_2) || \
((State) == TCP_CLOSING) || \
((State) == TCP_TIME_WAIT) || \
((State) == TCP_LAST_ACK) \
)
//
// Get the TCP_SEG point from a net buffer's ProtoData.
//
#define TCPSEG_NETBUF(NBuf) ((TCP_SEG *) ((NBuf)->ProtoData))
//
// Macros to compare sequence no
//
#define TCP_SEQ_LT(SeqA, SeqB) ((INT32) ((SeqA) - (SeqB)) < 0)
#define TCP_SEQ_LEQ(SeqA, SeqB) ((INT32) ((SeqA) - (SeqB)) <= 0)
#define TCP_SEQ_GT(SeqA, SeqB) ((INT32) ((SeqB) - (SeqA)) < 0)
#define TCP_SEQ_GEQ(SeqA, SeqB) ((INT32) ((SeqB) - (SeqA)) <= 0)
//
// TCP_SEQ_BETWEEN return whether b <= m <= e
//
#define TCP_SEQ_BETWEEN(b, m, e) ((e) - (b) >= (m) - (b))
//
// TCP_SUB_SEQ returns Seq1 - Seq2. Make sure Seq1 >= Seq2
//
#define TCP_SUB_SEQ(Seq1, Seq2) ((UINT32) ((Seq1) - (Seq2)))
//
// Check whether Flag is on
//
#define TCP_FLG_ON(Value, Flag) ((BOOLEAN) (((Value) & (Flag)) != 0))
//
// Set and Clear operation on a Flag
//
#define TCP_SET_FLG(Value, Flag) ((Value) |= (Flag))
#define TCP_CLEAR_FLG(Value, Flag) ((Value) &= ~(Flag))
//
// Test whether two peers are equal
//
#define TCP_PEER_EQUAL(Pa, Pb, Ver) \
(((Pa)->Port == (Pb)->Port) && TcpIsIpEqual(&((Pa)->Ip), &((Pb)->Ip), Ver))
//
// Test whether Pa matches Pb, or Pa is more specific
// than pb. Zero means wildcard.
//
#define TCP_PEER_MATCH(Pa, Pb, Ver) \
( \
(((Pb)->Port == 0) || ((Pb)->Port == (Pa)->Port)) && \
(TcpIsIpZero (&((Pb)->Ip), Ver) || TcpIsIpEqual (&((Pb)->Ip), &((Pa)->Ip), Ver)) \
)
#define TCP_TIMER_ON(Flag, Timer) ((Flag) & (1 << (Timer)))
#define TCP_SET_TIMER(Flag, Timer) ((Flag) = (UINT16) ((Flag) | (1 << (Timer))))
#define TCP_CLEAR_TIMER(Flag, Timer) ((Flag) = (UINT16) ((Flag) & (~(1 << (Timer)))))
#define TCP_TIME_LT(Ta, Tb) ((INT32) ((Ta) - (Tb)) < 0)
#define TCP_TIME_LEQ(Ta, Tb) ((INT32) ((Ta) - (Tb)) <= 0)
#define TCP_SUB_TIME(Ta, Tb) ((UINT32) ((Ta) - (Tb)))
#define TCP_MAX_WIN 0xFFFFU
///
/// TCP segmentation data.
///
typedef struct _TCP_SEG {
TCP_SEQNO Seq; ///< Starting sequence number.
TCP_SEQNO End; ///< The sequence of the last byte + 1, include SYN/FIN. End-Seq = SEG.LEN.
TCP_SEQNO Ack; ///< ACK field in the segment.
UINT8 Flag; ///< TCP header flags.
UINT16 Urg; ///< Valid if URG flag is set.
UINT32 Wnd; ///< TCP window size field.
} TCP_SEG;
///
/// Network endpoint, IP plus Port structure.
///
typedef struct _TCP_PEER {
EFI_IP_ADDRESS Ip; ///< IP address, in network byte order.
TCP_PORTNO Port; ///< Port number, in network byte order.
} TCP_PEER;
typedef struct _TCP_CONTROL_BLOCK TCP_CB;
///
/// TCP control block: it includes various states.
///
struct _TCP_CONTROL_BLOCK {
LIST_ENTRY List; ///< Back and forward link entry
TCP_CB *Parent; ///< The parent TCP_CB structure
SOCKET *Sk; ///< The socket it controlled.
TCP_PEER LocalEnd; ///< Local endpoint.
TCP_PEER RemoteEnd; ///< Remote endpoint.
LIST_ENTRY SndQue; ///< Retxmission queue.
LIST_ENTRY RcvQue; ///< Reassemble queue.
UINT32 CtrlFlag; ///< Control flags, such as NO_NAGLE.
INT32 Error; ///< Soft error status, such as TCP_CONNECT_RESET.
//
// RFC793 and RFC1122 defined variables
//
UINT8 State; ///< TCP state, such as SYN_SENT, LISTEN.
UINT8 DelayedAck; ///< Number of delayed ACKs.
UINT16 HeadSum; ///< Checksum of the fixed parts of pesudo
///< header: Src IP, Dst IP, 0, Protocol,
///< do not include the TCP length.
TCP_SEQNO Iss; ///< Initial Sending Sequence.
TCP_SEQNO SndUna; ///< First unacknowledged data.
TCP_SEQNO SndNxt; ///< Next data sequence to send.
TCP_SEQNO SndPsh; ///< Send PUSH point.
TCP_SEQNO SndUp; ///< Send urgent point.
UINT32 SndWnd; ///< Window advertised by the remote peer.
UINT32 SndWndMax; ///< Max send window advertised by the peer.
TCP_SEQNO SndWl1; ///< Seq number used for last window update.
TCP_SEQNO SndWl2; ///< Ack no of last window update.
UINT16 SndMss; ///< Max send segment size.
TCP_SEQNO RcvNxt; ///< Next sequence no to receive.
UINT32 RcvWnd; ///< Window advertised by the local peer.
TCP_SEQNO RcvWl2; ///< The RcvNxt (or ACK) of last window update.
///< It is necessary because of delayed ACK.
TCP_SEQNO RcvUp; ///< Urgent point;
TCP_SEQNO Irs; ///< Initial Receiving Sequence.
UINT16 RcvMss; ///< Max receive segment size.
UINT16 EnabledTimer; ///< Which timer is currently enabled.
UINT32 Timer[TCP_TIMER_NUMBER]; ///< When the timer will expire.
INT32 NextExpire; ///< Countdown offset for the nearest timer.
UINT32 Idle; ///< How long the connection is in idle.
UINT32 ProbeTime; ///< The time out value for current window prober.
BOOLEAN ProbeTimerOn; ///< If TRUE, the probe time is on.
//
// RFC7323 defined variables, about window scale,
// timestamp and PAWS
//
UINT8 SndWndScale; ///< Wndscale received from the peer.
UINT8 RcvWndScale; ///< Wndscale used to scale local buffer.
UINT32 TsRecent; ///< TsRecent to echo to the remote peer.
UINT32 TsRecentAge; ///< When this TsRecent is updated.
//
// RFC2988 defined variables. about RTT measurement
//
TCP_SEQNO RttSeq; ///< The seq of measured segment now.
UINT32 RttMeasure; ///< Currently measured RTT in heartbeats.
UINT32 SRtt; ///< Smoothed RTT, scaled by 8.
UINT32 RttVar; ///< RTT variance, scaled by 8.
UINT32 Rto; ///< Current RTO, not scaled.
//
// RFC2581, and 3782 variables.
// Congestion control + NewReno fast recovery.
//
UINT32 CWnd; ///< Sender's congestion window.
UINT32 Ssthresh; ///< Slow start threshold.
TCP_SEQNO Recover; ///< Recover point for NewReno.
UINT16 DupAck; ///< Number of duplicate ACKs.
UINT8 CongestState; ///< The current congestion state(RFC3782).
UINT8 LossTimes; ///< Number of retxmit timeouts in a row.
TCP_SEQNO LossRecover; ///< Recover point for retxmit.
//
// RFC7323
// Addressing Window Retraction for TCP Window Scale Option.
//
TCP_SEQNO RetxmitSeqMax; ///< Max Seq number in previous retransmission.
//
// configuration parameters, for EFI_TCP4_PROTOCOL specification
//
UINT32 KeepAliveIdle; ///< Idle time before sending first probe.
UINT32 KeepAlivePeriod; ///< Interval for subsequent keep alive probe.
UINT8 MaxKeepAlive; ///< Maximum keep alive probe times.
UINT8 KeepAliveProbes; ///< The number of keep alive probe.
UINT16 MaxRexmit; ///< The maximum number of retxmit before abort.
UINT32 FinWait2Timeout; ///< The FIN_WAIT_2 timeout.
UINT32 TimeWaitTimeout; ///< The TIME_WAIT timeout.
UINT32 ConnectTimeout; ///< The connect establishment timeout.
//
// configuration for tcp provided by user
//
BOOLEAN UseDefaultAddr;
UINT8 Tos;
UINT8 Ttl;
EFI_IPv4_ADDRESS SubnetMask;
BOOLEAN RemoteIpZero; ///< RemoteEnd.Ip is ZERO when configured.
IP_IO_IP_INFO *IpInfo; ///< Pointer reference to Ip used to send pkt
UINT32 Tick; ///< 1 tick = 200ms
};
#endif
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