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mirror_edk2/MdeModulePkg/Universal/Network/Tcp4Dxe/Tcp4Proto.h

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/** @file
Copyright (c) 2005 - 2006, Intel Corporation
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
Module Name:
Tcp4Proto.h
Abstract:
**/
#ifndef _TCP4_PROTO_H_
#define _TCP4_PROTO_H_
typedef struct _TCP_CB TCP_CB;
#include "Tcp4Driver.h"
#include "Socket.h"
#include "Tcp4Option.h"
//
// tcp states, Don't change their order, it is used as
// index to mTcpOutFlag and other macros
//
enum {
TCP_CLOSED = 0,
TCP_LISTEN,
TCP_SYN_SENT,
TCP_SYN_RCVD,
TCP_ESTABLISHED,
TCP_FIN_WAIT_1,
TCP_FIN_WAIT_2,
TCP_CLOSING,
TCP_TIME_WAIT,
TCP_CLOSE_WAIT,
TCP_LAST_ACK
};
//
// flags in the TCP header
//
enum {
TCP_FLG_FIN = 0x01,
TCP_FLG_SYN = 0x02,
TCP_FLG_RST = 0x04,
TCP_FLG_PSH = 0x08,
TCP_FLG_ACK = 0x10,
TCP_FLG_URG = 0x20,
TCP_FLG_FLAG = 0x3F // mask for all the flags
};
enum {
//
// TCP error status
//
TCP_CONNECT_REFUSED = -1,
TCP_CONNECT_RESET = -2,
TCP_CONNECT_CLOSED = -3,
//
// Current congestion status as suggested by RFC3782.
//
TCP_CONGEST_RECOVER = 1, // during the NewReno fast recovery
TCP_CONGEST_LOSS = 2, // retxmit because of retxmit time out
TCP_CONGEST_OPEN = 3, // TCP is opening its congestion window
//
// TCP control flags
//
TCP_CTRL_NO_NAGLE = 0x0001, // disable Nagle algorithm
TCP_CTRL_NO_KEEPALIVE = 0x0002, // disable keepalive timer
TCP_CTRL_NO_WS = 0x0004, // disable window scale option
TCP_CTRL_RCVD_WS = 0x0008, // rcvd a wnd scale option in syn
TCP_CTRL_NO_TS = 0x0010, // disable Timestamp option
TCP_CTRL_RCVD_TS = 0x0020, // rcvd a Timestamp option in syn
TCP_CTRL_SND_TS = 0x0040, // Send Timestamp option to remote
TCP_CTRL_SND_URG = 0x0080, // in urgent send mode
TCP_CTRL_RCVD_URG = 0x0100, // in urgent receive mode
TCP_CTRL_SND_PSH = 0x0200, // in PUSH send mode
TCP_CTRL_FIN_SENT = 0x0400, // FIN is sent
TCP_CTRL_FIN_ACKED = 0x0800, // FIN is ACKed.
TCP_CTRL_TIMER_ON = 0x1000, // At least one of the timer is on
TCP_CTRL_RTT_ON = 0x2000, // The RTT measurement is on
TCP_CTRL_ACK_NOW = 0x4000, // Send the ACK now, don't delay
//
// Timer related values
//
TCP_TIMER_CONNECT = 0, // Connection establishment timer
TCP_TIMER_REXMIT = 1, // retransmit timer
TCP_TIMER_PROBE = 2, // Window probe timer
TCP_TIMER_KEEPALIVE = 3, // Keepalive timer
TCP_TIMER_FINWAIT2 = 4, // FIN_WAIT_2 timer
TCP_TIMER_2MSL = 5, // TIME_WAIT tiemr
TCP_TIMER_NUMBER = 6, // the total number of TCP timer.
TCP_TICK = 200, // every TCP tick is 200ms
TCP_TICK_HZ = 5, // the frequence of TCP tick
TCP_RTT_SHIFT = 3, // SRTT & RTTVAR scaled by 8
TCP_RTO_MIN = TCP_TICK_HZ, // the minium value of RTO
TCP_RTO_MAX = TCP_TICK_HZ *60, // the maxium value of RTO
TCP_FOLD_RTT = 4, // timeout threshod to fold RTT
//
// default values for some timers
//
TCP_MAX_LOSS = 12, // default max times to retxmit
TCP_KEEPALIVE_IDLE_MIN = TCP_TICK_HZ *60 *60 *2, // First keep alive
TCP_KEEPALIVE_PERIOD = TCP_TICK_HZ *60,
TCP_MAX_KEEPALIVE = 8,
TCP_FIN_WAIT2_TIME = 2 *TCP_TICK_HZ, // * 60,
TCP_TIME_WAIT_TIME = 2 *TCP_TICK_HZ,
TCP_PAWS_24DAY = 24 *24 *60 *60 *TCP_TICK_HZ,
TCP_CONNECT_TIME = 75 *TCP_TICK_HZ,
//
// The header space to be reserved before TCP data to accomodate :
// 60byte IP head + 60byte TCP head + link layer head
//
TCP_MAX_HEAD = 192,
//
// value ranges for some control option
//
TCP_RCV_BUF_SIZE = 2 *1024 *1024,
TCP_RCV_BUF_SIZE_MIN = 8 *1024,
TCP_SND_BUF_SIZE = 2 *1024 *1024,
TCP_SND_BUF_SIZE_MIN = 8 *1024,
TCP_BACKLOG = 10,
TCP_BACKLOG_MIN = 5,
TCP_MAX_LOSS_MIN = 6,
TCP_CONNECT_TIME_MIN = 60 *TCP_TICK_HZ,
TCP_MAX_KEEPALIVE_MIN = 4,
TCP_KEEPALIVE_IDLE_MAX = TCP_TICK_HZ *60 *60 *4,
TCP_KEEPALIVE_PERIOD_MIN= TCP_TICK_HZ *30,
TCP_FIN_WAIT2_TIME_MAX = 4 *TCP_TICK_HZ,
TCP_TIME_WAIT_TIME_MAX = 60 *TCP_TICK_HZ
};
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 fild in the segment
UINT8 Flag; // TCP header flags
UINT16 Urg; // Valid if URG flag is set.
UINT32 Wnd; // TCP window size field
} TCP_SEG;
typedef struct _TCP_PEER {
UINT32 Ip; // Network byte order
TCP_PORTNO Port; // Network byte order
} TCP_PEER;
//
// tcp control block, it includes various states
//
struct _TCP_CB {
LIST_ENTRY List;
TCP_CB *Parent;
SOCKET *Sk;
TCP_PEER LocalEnd;
TCP_PEER RemoteEnd;
LIST_ENTRY SndQue; // retxmission queue
LIST_ENTRY RcvQue; // reassemble queue
UINT32 CtrlFlag; // control flags, such as NO_NAGLE
INT32 Error; // soft error status,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,
// 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; // count down offset for the nearest timer
UINT32 Idle; // How long the connection is in idle
UINT32 ProbeTime; // the time out value for current window prober
//
// RFC1323 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
// TCP_SEQNO LastAckSent;
// It isn't necessary to add LastAckSent here,
// since it is the same as RcvWl2
//
// RFC2988 defined variables. about RTT measurement
//
TCP_SEQNO RttSeq; // the seq of measured segment now
UINT32 RttMeasure; // currently measured RTT in heart beats
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
//
// 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; // Maxium keep alive probe times.
UINT8 KeepAliveProbes; // the number of keep alive probe.
UINT16 MaxRexmit; // The maxium number of retxmit before abort
UINT32 FinWait2Timeout; // The FIN_WAIT_2 time out
UINT32 TimeWaitTimeout; // The TIME_WAIT time out
UINT32 ConnectTimeout;
//
// configuration for tcp provided by user
//
BOOLEAN UseDefaultAddr;
UINT8 TOS;
UINT8 TTL;
EFI_IPv4_ADDRESS SubnetMask;
//
// pointer reference to Ip used to send pkt
//
IP_IO_IP_INFO *IpInfo;
};
extern LIST_ENTRY mTcpRunQue;
extern LIST_ENTRY mTcpListenQue;
extern TCP_SEQNO mTcpGlobalIss;
extern UINT32 mTcpTick;
//
// 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)))
#define TCP_FLG_ON(Value, Flag) ((BOOLEAN) (((Value) & (Flag)) != 0))
#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) \
(((Pa)->Ip == (Pb)->Ip) && ((Pa)->Port == (Pb)->Port))
//
// test whether Pa matches Pb, or Pa is more specific
// than pb. Zero means wildcard.
//
#define TCP_PEER_MATCH(Pa, Pb) \
((((Pb)->Ip == 0) || ((Pb)->Ip == (Pa)->Ip)) && \
(((Pb)->Port == 0) || ((Pb)->Port == (Pa)->Port)))
#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
typedef
VOID
(*TCP_TIMER_HANDLER) (
IN TCP_CB * Tcb
);
#include "Tcp4Func.h"
#endif
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