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406 lines
16 KiB
406 lines
16 KiB
// -*- mode: C++; tab-width: 4; indent-tabs-mode: nil -*- (for GNU Emacs)
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//
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// Copyright (c) 1985-2000 Microsoft Corporation
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//
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// This file is part of the Microsoft Research IPv6 Network Protocol Stack.
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// You should have received a copy of the Microsoft End-User License Agreement
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// for this software along with this release; see the file "license.txt".
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// If not, please see http://www.research.microsoft.com/msripv6/license.htm,
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// or write to Microsoft Research, One Microsoft Way, Redmond, WA 98052-6399.
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//
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// Abstract:
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//
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// Transmission Control Protocol definitions.
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//
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#ifndef _TCP_INCLUDED_
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#define _TCP_INCLUDED_
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#define IP_PROTOCOL_TCP 6
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#define DEFAULT_MSS (IPv6_MINIMUM_MTU - sizeof(IPv6Header) - sizeof(TCPHeader))
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// Timer stuff. We keep timers as ticks.
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#define MS_PER_TICK 100
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#define MS_TO_TICKS(m) ((m) / MS_PER_TICK)
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#define MIN_RETRAN_TICKS 3
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#define DEL_ACK_TICKS 2
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// Define MAX_REXMIT_TO to be number of ticks in 2MSL (=240 seconds)
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#define MAX_REXMIT_TO ((ushort)FinWait2TO)
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#define SWS_TO MS_TO_TICKS(5000)
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#define FIN_WAIT2_TO 240
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#define PUSH_TO MS_TO_TICKS(500)
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#define TCP_MD5_DATA_LENGTH 44
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typedef ulong TCP_TIME;
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#define MAX_CONN_TO_TICKS 0xffff
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#define INFINITE_CONN_TO(t) ((t) == 0)
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#define TCP_TIME_TO_TICKS(t) (((t)/MS_PER_TICK)+1)
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// Sequence numbers are kept as signed 32 bit quantities, with macros
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// defined to do wraparound comparisons on them.
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typedef int SeqNum; // A sequence number.
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//* Macros for comparions on sequence numbers.
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#define SEQ_GT(a, b) (((a) - (b)) > 0)
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#define SEQ_GTE(a, b) (((a) - (b)) >= 0)
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#define SEQ_LT(a, b) (((a) - (b)) < 0)
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#define SEQ_LTE(a, b) (((a) - (b)) <= 0)
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#define SEQ_EQ(a, b) ((a) == (b))
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// The TCB - transport control block structure. This is the
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// structure that contains all of the state for the transport
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// connection, including sequence numbers, flow control information,
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// pending sends and receives, etc.
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#define tcb_signature 0x20424354 // 'TCB '
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typedef struct TCB {
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struct TCB *tcb_next; // Next pointer in TCB table.
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#if DBG
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ulong tcb_sig; // Debug signature.
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#endif
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KSPIN_LOCK tcb_lock;
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// Send sequence variables.
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SeqNum tcb_senduna; // Sequence number of first unack'd data.
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SeqNum tcb_sendnext; // Sequence number of next byte to send.
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SeqNum tcb_sendmax; // Max value of sendnext this epoch.
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uint tcb_sendwin; // Send window.
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uint tcb_unacked; // Total number of bytes of unacked data.
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uint tcb_maxwin; // Max send window seen.
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uint tcb_cwin; // Congestion window.
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uint tcb_ssthresh; // Slow start threshold.
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uint tcb_phxsum; // Precomputed pseudo-header xsum.
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struct TCPSendReq *tcb_cursend; // Current send in use.
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PNDIS_BUFFER tcb_sendbuf; // Current buffer chain being sent.
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uint tcb_sendofs; // Offset into start of chain.
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uint tcb_sendsize; // Number of bytes unsent in current send.
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Queue tcb_sendq; // Queue of send requests.
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// Receive sequence variables.
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SeqNum tcb_rcvnext; // Next byte we expect to receive.
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int tcb_rcvwin; // Receive window we're offering.
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SeqNum tcb_rcvwinwatch; // Monitors peer's use of our rcv window.
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SeqNum tcb_sendwl1; // Window update sequence number.
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SeqNum tcb_sendwl2; // Window update ack number.
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struct TCPRcvReq *tcb_currcv; // Current receive buffer.
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uint tcb_indicated; // Bytes of data indicated.
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uint tcb_flags; // Flags for this TCB.
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uint tcb_fastchk; // Fast receive path check field.
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uint (*tcb_rcvhndlr)(struct TCB *, uint, IPv6Packet *, uint Size);
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// Addressing info.
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// NOTE: Do not make the [next 6] invariants non-consecutive. That would
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// break the MD5 computation.
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union {
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struct {
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// Addressing info.
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IPv6Addr tcb_daddr; // Destination IP address (i.e. our peer's address).
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IPv6Addr tcb_saddr; // Source IP address (i.e. one our our addresses).
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ulong tcb_dscope_id; // Scope id of destination address (0 if non-scoped).
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ulong tcb_sscope_id; // Scope id of source address (0 if non-scoped).
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ushort tcb_dport; // Destination port.
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ushort tcb_sport; // Source port.
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};
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uchar tcb_md5data[TCP_MD5_DATA_LENGTH];
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};
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int tcb_hops; // Hop limit.
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uint tcb_refcnt; // Reference count for TCB.
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SeqNum tcb_rttseq; // Sequence number being measured for Round Trip Time.
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// Retransmit timer information. These are stored as ticks, where by
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// default each tick is 100ms.
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ushort tcb_smrtt; // Smoothed rtt value.
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ushort tcb_delta; // Delta value.
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ushort tcb_rexmit; // Retransmit value.
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uchar tcb_slowcount; // Count of reasons why we're on the slow path.
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uchar tcb_pushtimer; // The 'push' timer.
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ushort tcb_mss; // Maximum Segment Size for this connection.
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ushort tcb_remmss; // MSS advertised by peer.
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// State information.
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uchar tcb_state; // State of this TCB.
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uchar tcb_rexmitcnt; // Count of rexmits on this TCB.
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uchar tcb_pending; // Pending actions on this TCB.
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uchar tcb_kacount; // Count of keep alive probes sent.
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IP_STATUS tcb_error; // Last error we heard about from IP.
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uint tcb_rtt; // Current round trip time TS.
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ushort tcb_rexmittimer; // Timer for rexmit.
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ushort tcb_delacktimer; // Timer for delayed ack.
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uint tcb_defaultwin; // Default rcv. window.
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uint tcb_alive; // Keep alive time value.
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struct TCPRAHdr *tcb_raq; // Reassembly queue.
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struct TCPRcvReq *tcb_rcvhead; // Head of recv. buffer queue.
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struct TCPRcvReq *tcb_rcvtail; // Tail of recv. buffer queue.
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uint tcb_pendingcnt; // Bytes waiting to be received.
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IPv6Packet *tcb_pendhead; // Head of pending receive queue.
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IPv6Packet *tcb_pendtail; // Tail of pending receive queue.
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struct TCPConnReq *tcb_connreq; // Connection-type request for this connection.
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void *tcb_conncontext; // Connection context for this connection.
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uint tcb_bcountlow; // Low part of byte count.
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uint tcb_bcounthi; // High part of bytecount.
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uint tcb_totaltime; // Total number of ticks spent sending.
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struct TCB *tcb_aonext; // Next pointer on AddrObj.
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struct TCPConn *tcb_conn; // Back pointer to conn for TCB.
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Queue tcb_delayq; // Queue linkage for delay queue.
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uchar tcb_closereason; // Reason we're closing.
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uchar tcb_bhprobecnt; // BH probe count.
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ushort tcb_swstimer; // Timer for SWS override.
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void *tcb_rcvind; // Receive indication handler.
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void *tcb_ricontext; // Receive indication context.
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// Miscellaneous info, for IP.
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RouteCacheEntry *tcb_rce; // RCE for this connection.
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uint tcb_pmtu; // So we know when RCE's PTMU changes.
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ulong tcb_security; // So we know when IPsec changes.
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struct TCPConnReq *tcb_discwait; // Disc-Wait req., if there is one.
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struct TCPRcvReq *tcb_exprcv; // Head of expedited recv. buffer queue.
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IPv6Packet *tcb_urgpending; // Urgent data queue.
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uint tcb_urgcnt; // Byte count of data on urgent q.
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uint tcb_urgind; // Urgent bytes indicated.
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SeqNum tcb_urgstart; // Start of urgent data.
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SeqNum tcb_urgend; // End of urgent data.
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uint tcb_walkcount; // Number of people 'walking' this TCB.
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uint tcb_connid; // Cached identifier for this TCB's Conn.
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ushort tcb_dupacks; // Number of duplicate acks seen.
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ushort tcb_force; // Force send.
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} TCB;
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//
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// Definitions for TCP states.
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//
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#define TCB_CLOSED 0 // Closed.
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#define TCB_LISTEN 1 // Listening.
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#define TCB_SYN_SENT 2 // SYN Sent.
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#define TCB_SYN_RCVD 3 // SYN received.
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#define TCB_ESTAB 4 // Established.
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#define TCB_FIN_WAIT1 5 // FIN-WAIT-1
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#define TCB_FIN_WAIT2 6 // FIN-WAIT-2
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#define TCB_CLOSE_WAIT 7 // Close waiting.
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#define TCB_CLOSING 8 // Closing state.
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#define TCB_LAST_ACK 9 // Last ack state.
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#define TCB_TIME_WAIT 10 // Time wait state.
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#define SYNC_STATE(s) ((s) > TCB_SYN_RCVD)
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#define GRACEFUL_CLOSED_STATE(s) ((s) >= TCB_LAST_ACK)
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#define DATA_RCV_STATE(s) ((s) >= TCB_ESTAB && (s) <= TCB_FIN_WAIT2)
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#define DATA_SEND_STATE(s) ((s) == TCB_ESTAB || (s) == TCB_CLOSE_WAIT)
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//
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// Definitions for TCB flags.
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//
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#define WINDOW_SET 0x00000001 // Window explictly set.
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#define CLIENT_OPTIONS 0x00000002 // Have client IP options on conn.
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#define CONN_ACCEPTED 0x00000004 // Connection was accepted.
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#define ACTIVE_OPEN 0x00000008 // Connection came from an active open.
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#define DISC_NOTIFIED 0x00000010 // Client's been notified of a disconnect.
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#define IN_DELAY_Q 0x00000020 // We're in the delayed action Q.
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#define RCV_CMPLTING 0x00000040 // We're completeing rcvs.
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#define IN_RCV_IND 0x00000080 // We're calling a rcv. indicate handler.
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#define NEED_RCV_CMPLT 0x00000100 // We need to have recvs. completed.
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#define NEED_ACK 0x00000200 // We need to send an ACK.
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#define NEED_OUTPUT 0x00000400 // We need to output.
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#define DELAYED_FLAGS (NEED_RCV_CMPLT | NEED_ACK | NEED_OUTPUT)
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#define ACK_DELAYED 0x00000800 // We've delayed sending an ACK.
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#define PMTU_BH_PROBE 0x00001000 // We're probing for a PMTU BH.
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#define BSD_URGENT 0x00002000 // We're using BSD urgent semantics.
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#define IN_DELIV_URG 0x00004000 // We're in the DeliverUrgent routine.
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#define URG_VALID 0x00008000 // Seen urgent data, and fields are valid.
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#define FIN_NEEDED 0x00010000 // We need to send a FIN.
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#define NAGLING 0x00020000 // We are using Nagle's algorithm.
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#define IN_TCP_SEND 0x00040000 // We're in TCPSend.
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#define FLOW_CNTLD 0x00080000 // We've received a zero window from peer.
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#define DISC_PENDING 0x00100000 // A disconnect notification is pending.
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#define TW_PENDING 0x00200000 // Waiting to finish going to TIME-WAIT.
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#define FORCE_OUTPUT 0x00400000 // Output is being forced.
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#define FORCE_OUT_SHIFT 22 // Shift to get FORCE_OUTPUT into low bit.
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#define SEND_AFTER_RCV 0x00800000 // Need to send after we get out of recv.
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#define GC_PENDING 0x01000000 // A graceful close is pending.
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#define KEEPALIVE 0x02000000 // Doing keepalives on this TCB.
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#define URG_INLINE 0x04000000 // Urgent data to be processed inline.
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#define ACCEPT_PENDING 0x08000000 // Sent SYN-ACK before indicating to ULP.
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#define FIN_OUTSTANDING 0x10000000 // We've sent a FIN 'recently', i.e.
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// since the last retransmit. When
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// this flag is set sendnext == sendmax.
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#define FIN_OUTS_SHIFT 28 // Shift to FIN_OUTSTANDING bit into low bit.
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#define FIN_SENT 0x20000000 // We've sent a FIN that hasn't been ack'd.
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// Once this bit has been turned on in
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// FIN-WAIT-1 the sequence number of the
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// FIN will be sendmax-1.
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#define NEED_RST 0x40000000 // We need to send a RST when closing.
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#define IN_TCB_TABLE 0x80000000 // TCB is in the TCB table.
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//
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// The defintion of the 'slow flags'.
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// If any of these flags are set we'll be forced off of the fast path.
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#define TCP_SLOW_FLAGS (URG_VALID | FLOW_CNTLD | GC_PENDING | TW_PENDING | \
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DISC_NOTIFIED | IN_DELIV_URG | FIN_NEEDED | \
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FIN_SENT | FIN_OUTSTANDING | DISC_PENDING | \
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PMTU_BH_PROBE)
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//
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// Close reasons.
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//
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#define TCB_CLOSE_RST 0x80 // Received a RST segment.
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#define TCB_CLOSE_ABORTED 0x40 // Had a local abort.
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#define TCB_CLOSE_TIMEOUT 0x20 // Connection timed out.
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#define TCB_CLOSE_REFUSED 0x10 // Connect attempt was refused.
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#define TCB_CLOSE_UNREACH 0x08 // Remote destination unreachable.
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#define TCB_CLOSE_SUCCESS 0x01 // Successfull close.
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//
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// TCB Timer macros.
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//
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#define START_TCB_TIMER(t, v) (t) = (v)
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#define STOP_TCB_TIMER(t) (t) = 0
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#define TCB_TIMER_RUNNING(t) ((t) != 0)
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// Macro to compute retransmit timeout.
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#define REXMIT_TO(t) ((((t)->tcb_smrtt >> 2) + (t)->tcb_delta) >> 1)
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//
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// Definitons for pending actions. We define a PENDING_ACTION macro that can
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// be used to decide whether or not we can proceed with an activity. The only
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// pending action we really care about is DELETE - others are low priority and
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// can be put off.
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//
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#define PENDING_ACTION(t) ((t)->tcb_pending & DEL_PENDING)
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#define DEL_PENDING 0x01 // Delete is pending.
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#define OPT_PENDING 0x02 // Option set is pending.
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// Macro to see if a TCB is closing.
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#define CLOSING(t) ((t)->tcb_pending & DEL_PENDING)
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//
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// Structure of a TCP packet header.
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//
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typedef struct TCPHeader {
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ushort tcp_src; // Source port.
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ushort tcp_dest; // Destination port.
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SeqNum tcp_seq; // Sequence number.
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SeqNum tcp_ack; // Ack number.
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ushort tcp_flags; // Flags and data offset.
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ushort tcp_window; // Window offered.
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ushort tcp_xsum; // Checksum.
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ushort tcp_urgent; // Urgent pointer.
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} TCPHeader;
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//
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// Definitions for TCP header flags.
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//
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#define TCP_FLAG_FIN 0x00000100
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#define TCP_FLAG_SYN 0x00000200
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#define TCP_FLAG_RST 0x00000400
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#define TCP_FLAG_PUSH 0x00000800
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#define TCP_FLAG_ACK 0x00001000
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#define TCP_FLAG_URG 0x00002000
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#define TCP_FLAGS_ALL (TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | \
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TCP_FLAG_ACK | TCP_FLAG_URG)
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//
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// Flags in the tcb_fastchk field that are not in the TCP header proper.
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// Setting these flags forces us off the fast path.
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//
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#define TCP_FLAG_SLOW 0x00000001 // Need to be on slow path.
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#define TCP_FLAG_IN_RCV 0x00000002 // In recv. path already.
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#define TCP_OFFSET_MASK 0xf0
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#define TCP_HDR_SIZE(t) (uint)(((*(uchar *)&(t)->tcp_flags) & TCP_OFFSET_MASK) >> 2)
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#define MAKE_TCP_FLAGS(o, f) ((f) | ((o) << 4))
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//
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// TCP Option Identifiers.
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//
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#define TCP_OPT_EOL 0
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#define TCP_OPT_NOP 1
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#define TCP_OPT_MSS 2
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#define MSS_OPT_SIZE 4
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//
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// Convenient byte swapped structure for receives.
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//
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typedef struct TCPRcvInfo {
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SeqNum tri_seq; // Sequence number.
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SeqNum tri_ack; // Ack number.
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uint tri_window; // Window.
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uint tri_urgent; // Urgent pointer.
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uint tri_flags; // Flags.
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} TCPRcvInfo;
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//
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// General structure, at the start of all command specific request structures.
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//
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#define tr_signature 0x20205254 // 'TR '
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typedef struct TCPReq {
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struct Queue tr_q; // Q linkage.
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#if DBG
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ulong tr_sig;
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#endif
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RequestCompleteRoutine tr_rtn; // Completion routine.
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PVOID tr_context; // User context.
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int tr_status; // Final complete status.
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} TCPReq;
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#define TCP6_TAG '6PCT'
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#ifdef POOL_TAGGING
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#ifdef ExAllocatePool
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#undef ExAllocatePool
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#endif
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#define ExAllocatePool(type, size) ExAllocatePoolWithTag(type, size, TCP6_TAG)
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#endif // POOL_TAGGING
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//
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// TCP endpoint context structure allocated for each open of TCP/UDP.
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// A pointer to this structure is stored in FileObject->FsContext.
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//
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typedef struct _TCP_CONTEXT {
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union {
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HANDLE AddressHandle;
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CONNECTION_CONTEXT ConnectionContext;
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HANDLE ControlChannel;
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} Handle;
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ULONG ReferenceCount;
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BOOLEAN CancelIrps;
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KSPIN_LOCK EndpointLock;
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#if DBG
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LIST_ENTRY PendingIrpList;
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LIST_ENTRY CancelledIrpList;
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#endif
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KEVENT CleanupEvent;
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} TCP_CONTEXT, *PTCP_CONTEXT;
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#include "tcpdeb.h"
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#endif // _TCP_INCLUDED_
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