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345 lines
13 KiB
C
345 lines
13 KiB
C
/** @file
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TCP protocol header file.
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Copyright (c) 2009 - 2017, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef _TCP_PROTO_H_
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#define _TCP_PROTO_H_
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///
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/// Tcp states don't change their order. It is used as an
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/// index to mTcpOutFlag and other macros.
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///
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#define TCP_CLOSED 0
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#define TCP_LISTEN 1
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#define TCP_SYN_SENT 2
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#define TCP_SYN_RCVD 3
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#define TCP_ESTABLISHED 4
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#define TCP_FIN_WAIT_1 5
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#define TCP_FIN_WAIT_2 6
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#define TCP_CLOSING 7
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#define TCP_TIME_WAIT 8
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#define TCP_CLOSE_WAIT 9
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#define TCP_LAST_ACK 10
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///
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/// Flags in the TCP header
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///
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#define TCP_FLG_FIN 0x01
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#define TCP_FLG_SYN 0x02
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#define TCP_FLG_RST 0x04
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#define TCP_FLG_PSH 0x08
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#define TCP_FLG_ACK 0x10
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#define TCP_FLG_URG 0x20
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//
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// mask for all the flags
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//
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#define TCP_FLG_FLAG 0x3F
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#define TCP_CONNECT_REFUSED (-1) ///< TCP error status
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#define TCP_CONNECT_RESET (-2) ///< TCP error status
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#define TCP_CONNECT_CLOSED (-3) ///< TCP error status
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//
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// Current congestion status as suggested by RFC3782.
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//
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#define TCP_CONGEST_RECOVER 1 ///< During the NewReno fast recovery.
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#define TCP_CONGEST_LOSS 2 ///< Retxmit because of retxmit time out.
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#define TCP_CONGEST_OPEN 3 ///< TCP is opening its congestion window.
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//
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// TCP control flags
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//
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#define TCP_CTRL_NO_NAGLE 0x0001 ///< Disable Nagle algorithm
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#define TCP_CTRL_NO_KEEPALIVE 0x0002 ///< Disable keepalive timer.
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#define TCP_CTRL_NO_WS 0x0004 ///< Disable window scale option.
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#define TCP_CTRL_RCVD_WS 0x0008 ///< Received a wnd scale option in syn.
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#define TCP_CTRL_NO_TS 0x0010 ///< Disable Timestamp option.
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#define TCP_CTRL_RCVD_TS 0x0020 ///< Received a Timestamp option in syn.
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#define TCP_CTRL_SND_TS 0x0040 ///< Send Timestamp option to remote.
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#define TCP_CTRL_SND_URG 0x0080 ///< In urgent send mode.
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#define TCP_CTRL_RCVD_URG 0x0100 ///< In urgent receive mode.
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#define TCP_CTRL_SND_PSH 0x0200 ///< In PUSH send mode.
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#define TCP_CTRL_FIN_SENT 0x0400 ///< FIN is sent.
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#define TCP_CTRL_FIN_ACKED 0x0800 ///< FIN is ACKed.
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#define TCP_CTRL_TIMER_ON 0x1000 ///< At least one of the timer is on.
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#define TCP_CTRL_RTT_ON 0x2000 ///< The RTT measurement is on.
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#define TCP_CTRL_ACK_NOW 0x4000 ///< Send the ACK now, don't delay.
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//
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// Timer related values
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//
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#define TCP_TIMER_CONNECT 0 ///< Connection establishment timer.
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#define TCP_TIMER_REXMIT 1 ///< Retransmit timer.
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#define TCP_TIMER_PROBE 2 ///< Window probe timer.
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#define TCP_TIMER_KEEPALIVE 3 ///< Keepalive timer.
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#define TCP_TIMER_FINWAIT2 4 ///< FIN_WAIT_2 timer.
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#define TCP_TIMER_2MSL 5 ///< TIME_WAIT timer.
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#define TCP_TIMER_NUMBER 6 ///< The total number of the TCP timer.
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#define TCP_TICK 200 ///< Every TCP tick is 200ms.
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#define TCP_TICK_HZ 5 ///< The frequence of TCP tick.
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#define TCP_RTT_SHIFT 3 ///< SRTT & RTTVAR scaled by 8.
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#define TCP_RTO_MIN TCP_TICK_HZ ///< The minium value of RTO.
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#define TCP_RTO_MAX (TCP_TICK_HZ * 60) ///< The maxium value of RTO.
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#define TCP_FOLD_RTT 4 ///< Timeout threshod to fold RTT.
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//
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// Default values for some timers
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//
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#define TCP_MAX_LOSS 12 ///< Default max times to retxmit.
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#define TCP_KEEPALIVE_IDLE_MIN (TCP_TICK_HZ * 60 * 60 * 2) ///< First keepalive.
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#define TCP_KEEPALIVE_PERIOD (TCP_TICK_HZ * 60)
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#define TCP_MAX_KEEPALIVE 8
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#define TCP_FIN_WAIT2_TIME (2 * TCP_TICK_HZ)
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#define TCP_TIME_WAIT_TIME (2 * TCP_TICK_HZ)
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#define TCP_PAWS_24DAY (24 * 24 * 60 * 60 * TCP_TICK_HZ)
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#define TCP_CONNECT_TIME (75 * TCP_TICK_HZ)
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//
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// The header space to be reserved before TCP data to accomodate :
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// 60byte IP head + 60byte TCP head + link layer head
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//
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#define TCP_MAX_HEAD 192
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//
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// Value ranges for some control option
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//
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#define TCP_RCV_BUF_SIZE (2 * 1024 * 1024)
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#define TCP_RCV_BUF_SIZE_MIN (8 * 1024)
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#define TCP_SND_BUF_SIZE (2 * 1024 * 1024)
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#define TCP_SND_BUF_SIZE_MIN (8 * 1024)
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#define TCP_BACKLOG 10
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#define TCP_BACKLOG_MIN 5
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#define TCP_MAX_LOSS_MIN 6
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#define TCP_CONNECT_TIME_MIN (60 * TCP_TICK_HZ)
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#define TCP_MAX_KEEPALIVE_MIN 4
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#define TCP_KEEPALIVE_IDLE_MAX (TCP_TICK_HZ * 60 * 60 * 4)
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#define TCP_KEEPALIVE_PERIOD_MIN (TCP_TICK_HZ * 30)
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#define TCP_FIN_WAIT2_TIME_MAX (4 * TCP_TICK_HZ)
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#define TCP_TIME_WAIT_TIME_MAX (60 * TCP_TICK_HZ)
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///
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/// TCP_CONNECTED: both ends have synchronized their ISN.
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///
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#define TCP_CONNECTED(state) ((state) > TCP_SYN_RCVD)
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#define TCP_FIN_RCVD(State) \
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( \
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((State) == TCP_CLOSE_WAIT) || \
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((State) == TCP_LAST_ACK) || \
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((State) == TCP_CLOSING) || \
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((State) == TCP_TIME_WAIT) \
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)
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#define TCP_LOCAL_CLOSED(State) \
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( \
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((State) == TCP_FIN_WAIT_1) || \
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((State) == TCP_FIN_WAIT_2) || \
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((State) == TCP_CLOSING) || \
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((State) == TCP_TIME_WAIT) || \
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((State) == TCP_LAST_ACK) \
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)
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//
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// Get the TCP_SEG point from a net buffer's ProtoData.
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//
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#define TCPSEG_NETBUF(NBuf) ((TCP_SEG *) ((NBuf)->ProtoData))
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//
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// Macros to compare sequence no
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//
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#define TCP_SEQ_LT(SeqA, SeqB) ((INT32) ((SeqA) - (SeqB)) < 0)
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#define TCP_SEQ_LEQ(SeqA, SeqB) ((INT32) ((SeqA) - (SeqB)) <= 0)
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#define TCP_SEQ_GT(SeqA, SeqB) ((INT32) ((SeqB) - (SeqA)) < 0)
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#define TCP_SEQ_GEQ(SeqA, SeqB) ((INT32) ((SeqB) - (SeqA)) <= 0)
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//
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// TCP_SEQ_BETWEEN return whether b <= m <= e
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//
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#define TCP_SEQ_BETWEEN(b, m, e) ((e) - (b) >= (m) - (b))
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//
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// TCP_SUB_SEQ returns Seq1 - Seq2. Make sure Seq1 >= Seq2
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//
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#define TCP_SUB_SEQ(Seq1, Seq2) ((UINT32) ((Seq1) - (Seq2)))
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//
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// Check whether Flag is on
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//
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#define TCP_FLG_ON(Value, Flag) ((BOOLEAN) (((Value) & (Flag)) != 0))
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//
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// Set and Clear operation on a Flag
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//
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#define TCP_SET_FLG(Value, Flag) ((Value) |= (Flag))
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#define TCP_CLEAR_FLG(Value, Flag) ((Value) &= ~(Flag))
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//
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// Test whether two peers are equal
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//
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#define TCP_PEER_EQUAL(Pa, Pb, Ver) \
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(((Pa)->Port == (Pb)->Port) && TcpIsIpEqual(&((Pa)->Ip), &((Pb)->Ip), Ver))
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//
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// Test whether Pa matches Pb, or Pa is more specific
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// than pb. Zero means wildcard.
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//
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#define TCP_PEER_MATCH(Pa, Pb, Ver) \
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( \
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(((Pb)->Port == 0) || ((Pb)->Port == (Pa)->Port)) && \
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(TcpIsIpZero (&((Pb)->Ip), Ver) || TcpIsIpEqual (&((Pb)->Ip), &((Pa)->Ip), Ver)) \
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)
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#define TCP_TIMER_ON(Flag, Timer) ((Flag) & (1 << (Timer)))
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#define TCP_SET_TIMER(Flag, Timer) ((Flag) = (UINT16) ((Flag) | (1 << (Timer))))
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#define TCP_CLEAR_TIMER(Flag, Timer) ((Flag) = (UINT16) ((Flag) & (~(1 << (Timer)))))
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#define TCP_TIME_LT(Ta, Tb) ((INT32) ((Ta) - (Tb)) < 0)
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#define TCP_TIME_LEQ(Ta, Tb) ((INT32) ((Ta) - (Tb)) <= 0)
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#define TCP_SUB_TIME(Ta, Tb) ((UINT32) ((Ta) - (Tb)))
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#define TCP_MAX_WIN 0xFFFFU
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///
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/// TCP segmentation data.
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///
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typedef struct _TCP_SEG {
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TCP_SEQNO Seq; ///< Starting sequence number.
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TCP_SEQNO End; ///< The sequence of the last byte + 1, include SYN/FIN. End-Seq = SEG.LEN.
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TCP_SEQNO Ack; ///< ACK field in the segment.
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UINT8 Flag; ///< TCP header flags.
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UINT16 Urg; ///< Valid if URG flag is set.
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UINT32 Wnd; ///< TCP window size field.
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} TCP_SEG;
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///
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/// Network endpoint, IP plus Port structure.
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///
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typedef struct _TCP_PEER {
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EFI_IP_ADDRESS Ip; ///< IP address, in network byte order.
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TCP_PORTNO Port; ///< Port number, in network byte order.
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} TCP_PEER;
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typedef struct _TCP_CONTROL_BLOCK TCP_CB;
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///
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/// TCP control block: it includes various states.
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///
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struct _TCP_CONTROL_BLOCK {
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LIST_ENTRY List; ///< Back and forward link entry
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TCP_CB *Parent; ///< The parent TCP_CB structure
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SOCKET *Sk; ///< The socket it controled.
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TCP_PEER LocalEnd; ///< Local endpoint.
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TCP_PEER RemoteEnd;///< Remote endpoint.
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LIST_ENTRY SndQue; ///< Retxmission queue.
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LIST_ENTRY RcvQue; ///< Reassemble queue.
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UINT32 CtrlFlag; ///< Control flags, such as NO_NAGLE.
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INT32 Error; ///< Soft error status, such as TCP_CONNECT_RESET.
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//
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// RFC793 and RFC1122 defined variables
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//
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UINT8 State; ///< TCP state, such as SYN_SENT, LISTEN.
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UINT8 DelayedAck; ///< Number of delayed ACKs.
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UINT16 HeadSum; ///< Checksum of the fixed parts of pesudo
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///< header: Src IP, Dst IP, 0, Protocol,
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///< do not include the TCP length.
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TCP_SEQNO Iss; ///< Initial Sending Sequence.
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TCP_SEQNO SndUna; ///< First unacknowledged data.
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TCP_SEQNO SndNxt; ///< Next data sequence to send.
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TCP_SEQNO SndPsh; ///< Send PUSH point.
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TCP_SEQNO SndUp; ///< Send urgent point.
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UINT32 SndWnd; ///< Window advertised by the remote peer.
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UINT32 SndWndMax; ///< Max send window advertised by the peer.
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TCP_SEQNO SndWl1; ///< Seq number used for last window update.
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TCP_SEQNO SndWl2; ///< Ack no of last window update.
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UINT16 SndMss; ///< Max send segment size.
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TCP_SEQNO RcvNxt; ///< Next sequence no to receive.
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UINT32 RcvWnd; ///< Window advertised by the local peer.
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TCP_SEQNO RcvWl2; ///< The RcvNxt (or ACK) of last window update.
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///< It is necessary because of delayed ACK.
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TCP_SEQNO RcvUp; ///< Urgent point;
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TCP_SEQNO Irs; ///< Initial Receiving Sequence.
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UINT16 RcvMss; ///< Max receive segment size.
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UINT16 EnabledTimer; ///< Which timer is currently enabled.
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UINT32 Timer[TCP_TIMER_NUMBER]; ///< When the timer will expire.
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INT32 NextExpire; ///< Countdown offset for the nearest timer.
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UINT32 Idle; ///< How long the connection is in idle.
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UINT32 ProbeTime; ///< The time out value for current window prober.
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BOOLEAN ProbeTimerOn;///< If TRUE, the probe time is on.
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//
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// RFC1323 defined variables, about window scale,
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// timestamp and PAWS
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//
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UINT8 SndWndScale; ///< Wndscale received from the peer.
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UINT8 RcvWndScale; ///< Wndscale used to scale local buffer.
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UINT32 TsRecent; ///< TsRecent to echo to the remote peer.
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UINT32 TsRecentAge; ///< When this TsRecent is updated.
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//
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// RFC2988 defined variables. about RTT measurement
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//
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TCP_SEQNO RttSeq; ///< The seq of measured segment now.
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UINT32 RttMeasure; ///< Currently measured RTT in heartbeats.
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UINT32 SRtt; ///< Smoothed RTT, scaled by 8.
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UINT32 RttVar; ///< RTT variance, scaled by 8.
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UINT32 Rto; ///< Current RTO, not scaled.
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//
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// RFC2581, and 3782 variables.
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// Congestion control + NewReno fast recovery.
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//
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UINT32 CWnd; ///< Sender's congestion window.
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UINT32 Ssthresh; ///< Slow start threshold.
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TCP_SEQNO Recover; ///< Recover point for NewReno.
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UINT16 DupAck; ///< Number of duplicate ACKs.
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UINT8 CongestState; ///< The current congestion state(RFC3782).
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UINT8 LossTimes; ///< Number of retxmit timeouts in a row.
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TCP_SEQNO LossRecover; ///< Recover point for retxmit.
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//
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// RFC7323
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// Addressing Window Retraction for TCP Window Scale Option.
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//
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TCP_SEQNO RetxmitSeqMax; ///< Max Seq number in previous retransmission.
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//
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// configuration parameters, for EFI_TCP4_PROTOCOL specification
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//
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UINT32 KeepAliveIdle; ///< Idle time before sending first probe.
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UINT32 KeepAlivePeriod; ///< Interval for subsequent keep alive probe.
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UINT8 MaxKeepAlive; ///< Maxium keep alive probe times.
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UINT8 KeepAliveProbes; ///< The number of keep alive probe.
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UINT16 MaxRexmit; ///< The maxium number of retxmit before abort.
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UINT32 FinWait2Timeout; ///< The FIN_WAIT_2 timeout.
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UINT32 TimeWaitTimeout; ///< The TIME_WAIT timeout.
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UINT32 ConnectTimeout; ///< The connect establishment timeout.
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//
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// configuration for tcp provided by user
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//
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BOOLEAN UseDefaultAddr;
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UINT8 Tos;
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UINT8 Ttl;
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EFI_IPv4_ADDRESS SubnetMask;
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BOOLEAN RemoteIpZero; ///< RemoteEnd.Ip is ZERO when configured.
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IP_IO_IP_INFO *IpInfo; ///< Pointer reference to Ip used to send pkt
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UINT32 Tick; ///< 1 tick = 200ms
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};
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#endif
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