| 1 | /** @file
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| 2 | TCP protocol header file.
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| 3 |
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| 4 | Copyright (c) 2009 - 2017, Intel Corporation. All rights reserved.<BR>
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| 5 |
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| 6 | SPDX-License-Identifier: BSD-2-Clause-Patent
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| 7 |
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| 8 | **/
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| 9 |
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| 10 | #ifndef _TCP_PROTO_H_
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| 11 | #define _TCP_PROTO_H_
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| 12 |
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| 13 | ///
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| 14 | /// Tcp states don't change their order. It is used as an
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| 15 | /// index to mTcpOutFlag and other macros.
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| 16 | ///
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| 17 | #define TCP_CLOSED 0
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| 18 | #define TCP_LISTEN 1
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| 19 | #define TCP_SYN_SENT 2
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| 20 | #define TCP_SYN_RCVD 3
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| 21 | #define TCP_ESTABLISHED 4
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| 22 | #define TCP_FIN_WAIT_1 5
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| 23 | #define TCP_FIN_WAIT_2 6
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| 24 | #define TCP_CLOSING 7
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| 25 | #define TCP_TIME_WAIT 8
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| 26 | #define TCP_CLOSE_WAIT 9
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| 27 | #define TCP_LAST_ACK 10
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| 28 |
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| 29 | ///
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| 30 | /// Flags in the TCP header
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| 31 | ///
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| 32 | #define TCP_FLG_FIN 0x01
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| 33 | #define TCP_FLG_SYN 0x02
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| 34 | #define TCP_FLG_RST 0x04
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| 35 | #define TCP_FLG_PSH 0x08
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| 36 | #define TCP_FLG_ACK 0x10
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| 37 | #define TCP_FLG_URG 0x20
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| 38 |
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| 39 | //
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| 40 | // mask for all the flags
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| 41 | //
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| 42 | #define TCP_FLG_FLAG 0x3F
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| 43 |
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| 44 | #define TCP_CONNECT_REFUSED (-1) ///< TCP error status
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| 45 | #define TCP_CONNECT_RESET (-2) ///< TCP error status
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| 46 | #define TCP_CONNECT_CLOSED (-3) ///< TCP error status
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| 47 |
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| 48 | //
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| 49 | // Current congestion status as suggested by RFC3782.
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| 50 | //
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| 51 | #define TCP_CONGEST_RECOVER 1 ///< During the NewReno fast recovery.
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| 52 | #define TCP_CONGEST_LOSS 2 ///< Retxmit because of retxmit time out.
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| 53 | #define TCP_CONGEST_OPEN 3 ///< TCP is opening its congestion window.
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| 54 |
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| 55 | //
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| 56 | // TCP control flags
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| 57 | //
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| 58 | #define TCP_CTRL_NO_NAGLE 0x0001 ///< Disable Nagle algorithm
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| 59 | #define TCP_CTRL_NO_KEEPALIVE 0x0002 ///< Disable keepalive timer.
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| 60 | #define TCP_CTRL_NO_WS 0x0004 ///< Disable window scale option.
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| 61 | #define TCP_CTRL_RCVD_WS 0x0008 ///< Received a wnd scale option in syn.
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| 62 | #define TCP_CTRL_NO_TS 0x0010 ///< Disable Timestamp option.
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| 63 | #define TCP_CTRL_RCVD_TS 0x0020 ///< Received a Timestamp option in syn.
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| 64 | #define TCP_CTRL_SND_TS 0x0040 ///< Send Timestamp option to remote.
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| 65 | #define TCP_CTRL_SND_URG 0x0080 ///< In urgent send mode.
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| 66 | #define TCP_CTRL_RCVD_URG 0x0100 ///< In urgent receive mode.
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| 67 | #define TCP_CTRL_SND_PSH 0x0200 ///< In PUSH send mode.
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| 68 | #define TCP_CTRL_FIN_SENT 0x0400 ///< FIN is sent.
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| 69 | #define TCP_CTRL_FIN_ACKED 0x0800 ///< FIN is ACKed.
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| 70 | #define TCP_CTRL_TIMER_ON 0x1000 ///< At least one of the timer is on.
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| 71 | #define TCP_CTRL_RTT_ON 0x2000 ///< The RTT measurement is on.
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| 72 | #define TCP_CTRL_ACK_NOW 0x4000 ///< Send the ACK now, don't delay.
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| 73 |
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| 74 | //
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| 75 | // Timer related values
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| 76 | //
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| 77 | #define TCP_TIMER_CONNECT 0 ///< Connection establishment timer.
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| 78 | #define TCP_TIMER_REXMIT 1 ///< Retransmit timer.
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| 79 | #define TCP_TIMER_PROBE 2 ///< Window probe timer.
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| 80 | #define TCP_TIMER_KEEPALIVE 3 ///< Keepalive timer.
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| 81 | #define TCP_TIMER_FINWAIT2 4 ///< FIN_WAIT_2 timer.
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| 82 | #define TCP_TIMER_2MSL 5 ///< TIME_WAIT timer.
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| 83 | #define TCP_TIMER_NUMBER 6 ///< The total number of the TCP timer.
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| 84 | #define TCP_TICK 200 ///< Every TCP tick is 200ms.
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| 85 | #define TCP_TICK_HZ 5 ///< The frequence of TCP tick.
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| 86 | #define TCP_RTT_SHIFT 3 ///< SRTT & RTTVAR scaled by 8.
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| 87 | #define TCP_RTO_MIN TCP_TICK_HZ ///< The minimum value of RTO.
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| 88 | #define TCP_RTO_MAX (TCP_TICK_HZ * 60) ///< The maximum value of RTO.
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| 89 | #define TCP_FOLD_RTT 4 ///< Timeout threshold to fold RTT.
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| 90 |
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| 91 | //
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| 92 | // Default values for some timers
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| 93 | //
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| 94 | #define TCP_MAX_LOSS 12 ///< Default max times to retxmit.
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| 95 | #define TCP_KEEPALIVE_IDLE_MIN (TCP_TICK_HZ * 60 * 60 * 2) ///< First keepalive.
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| 96 | #define TCP_KEEPALIVE_PERIOD (TCP_TICK_HZ * 60)
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| 97 | #define TCP_MAX_KEEPALIVE 8
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| 98 | #define TCP_FIN_WAIT2_TIME (2 * TCP_TICK_HZ)
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| 99 | #define TCP_TIME_WAIT_TIME (2 * TCP_TICK_HZ)
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| 100 | #define TCP_PAWS_24DAY (24 * 24 * 60 * 60 * TCP_TICK_HZ)
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| 101 | #define TCP_CONNECT_TIME (75 * TCP_TICK_HZ)
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| 102 |
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| 103 | //
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| 104 | // The header space to be reserved before TCP data to accommodate:
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| 105 | // 60byte IP head + 60byte TCP head + link layer head
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| 106 | //
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| 107 | #define TCP_MAX_HEAD 192
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| 108 |
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| 109 | //
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| 110 | // Value ranges for some control option
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| 111 | //
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| 112 | #define TCP_RCV_BUF_SIZE (2 * 1024 * 1024)
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| 113 | #define TCP_RCV_BUF_SIZE_MIN (8 * 1024)
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| 114 | #define TCP_SND_BUF_SIZE (2 * 1024 * 1024)
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| 115 | #define TCP_SND_BUF_SIZE_MIN (8 * 1024)
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| 116 | #define TCP_BACKLOG 10
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| 117 | #define TCP_BACKLOG_MIN 5
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| 118 | #define TCP_MAX_LOSS_MIN 6
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| 119 | #define TCP_CONNECT_TIME_MIN (60 * TCP_TICK_HZ)
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| 120 | #define TCP_MAX_KEEPALIVE_MIN 4
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| 121 | #define TCP_KEEPALIVE_IDLE_MAX (TCP_TICK_HZ * 60 * 60 * 4)
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| 122 | #define TCP_KEEPALIVE_PERIOD_MIN (TCP_TICK_HZ * 30)
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| 123 | #define TCP_FIN_WAIT2_TIME_MAX (4 * TCP_TICK_HZ)
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| 124 | #define TCP_TIME_WAIT_TIME_MAX (60 * TCP_TICK_HZ)
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| 125 |
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| 126 | ///
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| 127 | /// TCP_CONNECTED: both ends have synchronized their ISN.
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| 128 | ///
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| 129 | #define TCP_CONNECTED(state) ((state) > TCP_SYN_RCVD)
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| 130 |
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| 131 | #define TCP_FIN_RCVD(State) \
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| 132 | ( \
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| 133 | ((State) == TCP_CLOSE_WAIT) || \
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| 134 | ((State) == TCP_LAST_ACK) || \
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| 135 | ((State) == TCP_CLOSING) || \
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| 136 | ((State) == TCP_TIME_WAIT) \
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| 137 | )
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| 138 |
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| 139 | #define TCP_LOCAL_CLOSED(State) \
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| 140 | ( \
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| 141 | ((State) == TCP_FIN_WAIT_1) || \
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| 142 | ((State) == TCP_FIN_WAIT_2) || \
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| 143 | ((State) == TCP_CLOSING) || \
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| 144 | ((State) == TCP_TIME_WAIT) || \
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| 145 | ((State) == TCP_LAST_ACK) \
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| 146 | )
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| 147 |
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| 148 | //
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| 149 | // Get the TCP_SEG point from a net buffer's ProtoData.
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| 150 | //
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| 151 | #define TCPSEG_NETBUF(NBuf) ((TCP_SEG *) ((NBuf)->ProtoData))
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| 152 |
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| 153 | //
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| 154 | // Macros to compare sequence no
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| 155 | //
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| 156 | #define TCP_SEQ_LT(SeqA, SeqB) ((INT32) ((SeqA) - (SeqB)) < 0)
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| 157 | #define TCP_SEQ_LEQ(SeqA, SeqB) ((INT32) ((SeqA) - (SeqB)) <= 0)
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| 158 | #define TCP_SEQ_GT(SeqA, SeqB) ((INT32) ((SeqB) - (SeqA)) < 0)
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| 159 | #define TCP_SEQ_GEQ(SeqA, SeqB) ((INT32) ((SeqB) - (SeqA)) <= 0)
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| 160 |
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| 161 | //
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| 162 | // TCP_SEQ_BETWEEN return whether b <= m <= e
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| 163 | //
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| 164 | #define TCP_SEQ_BETWEEN(b, m, e) ((e) - (b) >= (m) - (b))
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| 165 |
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| 166 | //
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| 167 | // TCP_SUB_SEQ returns Seq1 - Seq2. Make sure Seq1 >= Seq2
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| 168 | //
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| 169 | #define TCP_SUB_SEQ(Seq1, Seq2) ((UINT32) ((Seq1) - (Seq2)))
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| 170 |
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| 171 | //
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| 172 | // Check whether Flag is on
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| 173 | //
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| 174 | #define TCP_FLG_ON(Value, Flag) ((BOOLEAN) (((Value) & (Flag)) != 0))
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| 175 | //
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| 176 | // Set and Clear operation on a Flag
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| 177 | //
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| 178 | #define TCP_SET_FLG(Value, Flag) ((Value) |= (Flag))
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| 179 | #define TCP_CLEAR_FLG(Value, Flag) ((Value) &= ~(Flag))
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| 180 |
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| 181 | //
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| 182 | // Test whether two peers are equal
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| 183 | //
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| 184 | #define TCP_PEER_EQUAL(Pa, Pb, Ver) \
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| 185 | (((Pa)->Port == (Pb)->Port) && TcpIsIpEqual(&((Pa)->Ip), &((Pb)->Ip), Ver))
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| 186 |
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| 187 | //
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| 188 | // Test whether Pa matches Pb, or Pa is more specific
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| 189 | // than pb. Zero means wildcard.
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| 190 | //
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| 191 | #define TCP_PEER_MATCH(Pa, Pb, Ver) \
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| 192 | ( \
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| 193 | (((Pb)->Port == 0) || ((Pb)->Port == (Pa)->Port)) && \
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| 194 | (TcpIsIpZero (&((Pb)->Ip), Ver) || TcpIsIpEqual (&((Pb)->Ip), &((Pa)->Ip), Ver)) \
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| 195 | )
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| 196 |
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| 197 | #define TCP_TIMER_ON(Flag, Timer) ((Flag) & (1 << (Timer)))
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| 198 | #define TCP_SET_TIMER(Flag, Timer) ((Flag) = (UINT16) ((Flag) | (1 << (Timer))))
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| 199 | #define TCP_CLEAR_TIMER(Flag, Timer) ((Flag) = (UINT16) ((Flag) & (~(1 << (Timer)))))
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| 200 |
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| 201 | #define TCP_TIME_LT(Ta, Tb) ((INT32) ((Ta) - (Tb)) < 0)
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| 202 | #define TCP_TIME_LEQ(Ta, Tb) ((INT32) ((Ta) - (Tb)) <= 0)
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| 203 | #define TCP_SUB_TIME(Ta, Tb) ((UINT32) ((Ta) - (Tb)))
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| 204 |
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| 205 | #define TCP_MAX_WIN 0xFFFFU
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| 206 |
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| 207 | ///
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| 208 | /// TCP segmentation data.
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| 209 | ///
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| 210 | typedef struct _TCP_SEG {
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| 211 | TCP_SEQNO Seq; ///< Starting sequence number.
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| 212 | TCP_SEQNO End; ///< The sequence of the last byte + 1, include SYN/FIN. End-Seq = SEG.LEN.
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| 213 | TCP_SEQNO Ack; ///< ACK field in the segment.
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| 214 | UINT8 Flag; ///< TCP header flags.
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| 215 | UINT16 Urg; ///< Valid if URG flag is set.
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| 216 | UINT32 Wnd; ///< TCP window size field.
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| 217 | } TCP_SEG;
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| 218 |
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| 219 | ///
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| 220 | /// Network endpoint, IP plus Port structure.
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| 221 | ///
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| 222 | typedef struct _TCP_PEER {
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| 223 | EFI_IP_ADDRESS Ip; ///< IP address, in network byte order.
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| 224 | TCP_PORTNO Port; ///< Port number, in network byte order.
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| 225 | } TCP_PEER;
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| 226 |
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| 227 | typedef struct _TCP_CONTROL_BLOCK TCP_CB;
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| 228 |
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| 229 | ///
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| 230 | /// TCP control block: it includes various states.
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| 231 | ///
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| 232 | struct _TCP_CONTROL_BLOCK {
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| 233 | LIST_ENTRY List; ///< Back and forward link entry
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| 234 | TCP_CB *Parent; ///< The parent TCP_CB structure
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| 235 |
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| 236 | SOCKET *Sk; ///< The socket it controlled.
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| 237 | TCP_PEER LocalEnd; ///< Local endpoint.
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| 238 | TCP_PEER RemoteEnd; ///< Remote endpoint.
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| 239 |
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| 240 | LIST_ENTRY SndQue; ///< Retxmission queue.
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| 241 | LIST_ENTRY RcvQue; ///< Reassemble queue.
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| 242 | UINT32 CtrlFlag; ///< Control flags, such as NO_NAGLE.
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| 243 | INT32 Error; ///< Soft error status, such as TCP_CONNECT_RESET.
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| 244 |
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| 245 | //
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| 246 | // RFC793 and RFC1122 defined variables
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| 247 | //
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| 248 | UINT8 State; ///< TCP state, such as SYN_SENT, LISTEN.
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| 249 | UINT8 DelayedAck; ///< Number of delayed ACKs.
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| 250 | UINT16 HeadSum; ///< Checksum of the fixed parts of pesudo
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| 251 | ///< header: Src IP, Dst IP, 0, Protocol,
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| 252 | ///< do not include the TCP length.
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| 253 |
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| 254 | TCP_SEQNO Iss; ///< Initial Sending Sequence.
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| 255 | TCP_SEQNO SndUna; ///< First unacknowledged data.
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| 256 | TCP_SEQNO SndNxt; ///< Next data sequence to send.
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| 257 | TCP_SEQNO SndPsh; ///< Send PUSH point.
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| 258 | TCP_SEQNO SndUp; ///< Send urgent point.
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| 259 | UINT32 SndWnd; ///< Window advertised by the remote peer.
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| 260 | UINT32 SndWndMax; ///< Max send window advertised by the peer.
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| 261 | TCP_SEQNO SndWl1; ///< Seq number used for last window update.
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| 262 | TCP_SEQNO SndWl2; ///< Ack no of last window update.
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| 263 | UINT16 SndMss; ///< Max send segment size.
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| 264 | TCP_SEQNO RcvNxt; ///< Next sequence no to receive.
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| 265 | UINT32 RcvWnd; ///< Window advertised by the local peer.
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| 266 | TCP_SEQNO RcvWl2; ///< The RcvNxt (or ACK) of last window update.
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| 267 | ///< It is necessary because of delayed ACK.
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| 268 |
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| 269 | TCP_SEQNO RcvUp; ///< Urgent point;
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| 270 | TCP_SEQNO Irs; ///< Initial Receiving Sequence.
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| 271 | UINT16 RcvMss; ///< Max receive segment size.
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| 272 | UINT16 EnabledTimer; ///< Which timer is currently enabled.
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| 273 | UINT32 Timer[TCP_TIMER_NUMBER]; ///< When the timer will expire.
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| 274 | INT32 NextExpire; ///< Countdown offset for the nearest timer.
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| 275 | UINT32 Idle; ///< How long the connection is in idle.
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| 276 | UINT32 ProbeTime; ///< The time out value for current window prober.
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| 277 | BOOLEAN ProbeTimerOn; ///< If TRUE, the probe time is on.
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| 278 |
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| 279 | //
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| 280 | // RFC7323 defined variables, about window scale,
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| 281 | // timestamp and PAWS
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| 282 | //
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| 283 | UINT8 SndWndScale; ///< Wndscale received from the peer.
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| 284 | UINT8 RcvWndScale; ///< Wndscale used to scale local buffer.
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| 285 | UINT32 TsRecent; ///< TsRecent to echo to the remote peer.
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| 286 | UINT32 TsRecentAge; ///< When this TsRecent is updated.
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| 287 |
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| 288 | //
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| 289 | // RFC2988 defined variables. about RTT measurement
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| 290 | //
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| 291 | TCP_SEQNO RttSeq; ///< The seq of measured segment now.
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| 292 | UINT32 RttMeasure; ///< Currently measured RTT in heartbeats.
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| 293 | UINT32 SRtt; ///< Smoothed RTT, scaled by 8.
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| 294 | UINT32 RttVar; ///< RTT variance, scaled by 8.
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| 295 | UINT32 Rto; ///< Current RTO, not scaled.
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| 296 |
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| 297 | //
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| 298 | // RFC2581, and 3782 variables.
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| 299 | // Congestion control + NewReno fast recovery.
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| 300 | //
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| 301 | UINT32 CWnd; ///< Sender's congestion window.
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| 302 | UINT32 Ssthresh; ///< Slow start threshold.
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| 303 | TCP_SEQNO Recover; ///< Recover point for NewReno.
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| 304 | UINT16 DupAck; ///< Number of duplicate ACKs.
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| 305 | UINT8 CongestState; ///< The current congestion state(RFC3782).
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| 306 | UINT8 LossTimes; ///< Number of retxmit timeouts in a row.
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| 307 | TCP_SEQNO LossRecover; ///< Recover point for retxmit.
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| 308 |
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| 309 | //
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| 310 | // RFC7323
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| 311 | // Addressing Window Retraction for TCP Window Scale Option.
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| 312 | //
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| 313 | TCP_SEQNO RetxmitSeqMax; ///< Max Seq number in previous retransmission.
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| 314 |
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| 315 | //
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| 316 | // configuration parameters, for EFI_TCP4_PROTOCOL specification
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| 317 | //
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| 318 | UINT32 KeepAliveIdle; ///< Idle time before sending first probe.
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| 319 | UINT32 KeepAlivePeriod; ///< Interval for subsequent keep alive probe.
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| 320 | UINT8 MaxKeepAlive; ///< Maximum keep alive probe times.
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| 321 | UINT8 KeepAliveProbes; ///< The number of keep alive probe.
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| 322 | UINT16 MaxRexmit; ///< The maximum number of retxmit before abort.
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| 323 | UINT32 FinWait2Timeout; ///< The FIN_WAIT_2 timeout.
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| 324 | UINT32 TimeWaitTimeout; ///< The TIME_WAIT timeout.
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| 325 | UINT32 ConnectTimeout; ///< The connect establishment timeout.
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| 326 |
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| 327 | //
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| 328 | // configuration for tcp provided by user
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| 329 | //
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| 330 | BOOLEAN UseDefaultAddr;
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| 331 | UINT8 Tos;
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| 332 | UINT8 Ttl;
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| 333 | EFI_IPv4_ADDRESS SubnetMask;
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| 334 |
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| 335 | BOOLEAN RemoteIpZero; ///< RemoteEnd.Ip is ZERO when configured.
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| 336 | IP_IO_IP_INFO *IpInfo; ///< Pointer reference to Ip used to send pkt
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| 337 | UINT32 Tick; ///< 1 tick = 200ms
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| 338 | };
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| 339 |
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| 340 | #endif
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