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/** Microsoft LAN Manager **//** Copyright(c) Microsoft Corp., 1990-2000 **//********************************************************************//* :ts=4 */
#ifndef _TCP_INCLUDED_
#define _TCP_INCLUDED_
#include "tcpinfo.h"
//** TCP.H - TCP definitions.
//
// This file contains the definitions of TCP protocol specific options, such
// as the sequence numbers and TCB.
//
#define PROTOCOL_TCP 6
#define MIN_LOCAL_MSS 88
#define MAX_REMOTE_MSS 536
//* Timer stuff. We keep timers as ticks.
#define MS_PER_TICK 100
#define MS_TO_TICKS(m) ((m) / MS_PER_TICK)
#define MIN_RETRAN_TICKS 3
#define DEL_ACK_TICKS 2
#define MAX_DEL_ACK_TICKS 6
#define MIN_INITIAL_RTT 3
// Define MAX_REXMIT_TO to be number of ticks in 2MSL
#define MAX_REXMIT_TO ((ushort)FinWait2TO)
#define SWS_TO MS_TO_TICKS(5000)
#define PUSH_TO MS_TO_TICKS(500)
typedef ulong TCP_TIME;#define MAX_CONN_TO_TICKS 0xffff
#define INFINITE_CONN_TO(t) ((t) == 0)
#define TCP_TIME_TO_TICKS(t) (((t)/MS_PER_TICK)+1)
// Sequence numbers are kept as signed 32 bit quantities, with macros
// defined to do wraparound comparisons on them.
typedef int SeqNum; // A sequence number.
//* Macros for comparions on sequence numbers.
#define SEQ_GT(a, b) ((SeqNum)((a) - (b)) > 0)
#define SEQ_GTE(a, b) ((SeqNum)((a) - (b)) >= 0)
#define SEQ_LT(a, b) ((SeqNum)((a) - (b)) < 0)
#define SEQ_LTE(a, b) ((SeqNum)((a) - (b)) <= 0)
#define SEQ_EQ(a, b) ((a) == (b))
#define TS_LT(a, b) (((a) - (b)) < 0)
#define TS_LTE(a, b) (((a) - (b)) <= 0)
#define TS_GTE(a, b) (((a) - (b)) >= 0)
#define TCPTIME_LTE(a, b) ((int)((a) - (b)) <= 0)
#define TCPTIME_LT(a, b) ((int)((a) - (b)) < 0)
#define TIMWAITTABLE 1 //turn on timed wait TCB table changes
#define IRPFIX 1 //turn on quick Irp to Conn find
#if DBG && !MILLEN
#ifndef REFERENCE_DEBUG
#define REFERENCE_DEBUG 1
#endif
#else // DBG && !MILLEN
#ifndef REFERENCE_DEBUG
#define REFERENCE_DEBUG 0
#endif
#endif // DBG && !MILLEN
#if REFERENCE_DEBUG
// Reference history structure.
//
#define MAX_REFERENCE_HISTORY 64
typedef struct _TCP_REFERENCE_HISTORY { uchar *File; uint Line; void *Caller; uint Count;} TCP_REFERENCE_HISTORY;
#endif // REFERENCE_DEBUG
//* The TCB - transport control block structure. This is the
// structure that contains all of the state for the transport
// connection, including sequence numbers, flow control information,
// pending sends and receives, etc.
#define tcb_signature 0x20424354 // 'TCB '
#define twtcb_signature 0x22424354 // 'TCB2'
#define syntcb_signature 0x23424354 // 'TCB3'
typedef struct TWTCB {#if DBG
ulong twtcb_sig;#endif
Queue twtcb_link;
// Do not reorder or move apart the following address fields.
union { struct twtcb_addrinfo { IPAddr twtcb_daddr; // Destination IP address.
IPAddr twtcb_saddr; // Source IP address.
ushort twtcb_dport; // Destination port.
ushort twtcb_sport; // Source port.
}; TCPAddrInfo twtcb_addrbytes; }; Queue twtcb_TWQueue; // Place to hang all the timed_waits
ushort twtcb_delta; ushort twtcb_rexmittimer; SeqNum twtcb_rcvnext; SeqNum twtcb_sendnext;
#if DBG
uint twtcb_flags;#endif
} TWTCB;
typedef struct SYNTCB {#if DBG
ulong syntcb_sig; // Debug signature.
#endif
Queue syntcb_link; // Next pointer in TCB table.
DEFINE_LOCK_STRUCTURE(syntcb_lock)
// Do not reorder or move apart the following address fields.
union { struct syntcb_addrinfo { IPAddr syntcb_daddr; // Destination IP address.
IPAddr syntcb_saddr; // Source IP address.
ushort syntcb_dport; // Destination port.
ushort syntcb_sport; // Source port.
}; TCPAddrInfo syntcb_addrbytes; };
// State information.
uchar syntcb_state; // State of this TCB.
uchar syntcb_rexmitcnt; // Count of rexmits on this TCB.
// Highly used receive sequence variables.
ushort syntcb_mss; // MSS for this connection.
ushort syntcb_remmss; // MSS advertised by peer.
uchar syntcb_tcpopts; // rfc 1323 and 2018 options holder
uchar syntcb_ttl; SeqNum syntcb_rcvnext; // Next byte we expect to receive.
// Send sequence variables.
SeqNum syntcb_sendnext; // Sequence number of next byte to send.
uint syntcb_sendwin; // Send window.
uint syntcb_flags; // Flags for this TCB.
uint syntcb_refcnt; // Reference count for TCB.
ushort syntcb_rexmit; // Rexmit value.
ushort syntcb_rexmittimer;// Timer for rexmit.
uint syntcb_defaultwin; // Default rcv. window.
short syntcb_sndwinscale;// send window scale
short syntcb_rcvwinscale;// receive window scale
int syntcb_tsrecent; // time stamp recent
int syntcb_tsupdatetime; // Time when tsrecent was updated
uint syntcb_walkcount; uint syntcb_partition;} SYNTCB;
#if TRACE_EVENT
typedef struct WMIData { ulong wmi_context; // PID
ulong wmi_size; // num Bytes successfully sent.
IPAddr wmi_destaddr; // Remote IPAddr.
IPAddr wmi_srcaddr; // Local IPAddr.
ushort wmi_destport; // Remote port.
ushort wmi_srcport; // Local Port.
} WMIData;#endif
// We will have 7 timers in TCP, and integrate all their processing
typedef enum { RXMIT_TIMER = 0, DELACK_TIMER, PUSH_TIMER, SWS_TIMER, ACD_TIMER, CONN_TIMER, KA_TIMER, NUM_TIMERS} TCP_TIMER_TYPE;
#define NO_TIMER NUM_TIMERS
typedef struct TCB {#if DBG
ulong tcb_sig; // Debug signature.
#endif
struct TCB *tcb_next; // Next pointer in TCB table.
DEFINE_LOCK_STRUCTURE(tcb_lock) uint tcb_refcnt; // Reference count for TCB.
// Do not reorder or move apart the following address fields.
union { struct tcb_addrinfo { IPAddr tcb_daddr; // Destination IP address.
IPAddr tcb_saddr; // Source IP address.
ushort tcb_dport; // Destination port.
ushort tcb_sport; // Source port.
}; TCPAddrInfo tcb_addrbytes; }; #if TRACE_EVENT
ulong tcb_cpcontext;#endif
// State information.
uchar tcb_state; // State of this TCB.
uchar tcb_rexmitcnt; // Count of rexmits on this TCB.
uchar tcb_pending; // Pending actions on this TCB.
uchar tcb_kacount; // Count of keep alive probes sent.
// Highly used receive sequence variables.
ushort tcb_mss; // MSS for this connection.
ushort tcb_remmss; // MSS advertised by peer.
SeqNum tcb_rcvnext; // Next byte we expect to receive.
int tcb_rcvwin; // Receive window we're offering.
// Send sequence variables.
SeqNum tcb_senduna; // Sequence number of first unack'd data.
SeqNum tcb_sendnext; // Sequence number of next byte to send.
SeqNum tcb_sendmax; // Max value of sendnext this epoch.
uint tcb_sendwin; // Send window.
uint tcb_unacked; // Total number of bytes of unacked data.
uint tcb_maxwin; // Max send window seen.
uint tcb_cwin; // Congestion window.
uint tcb_ssthresh; // Slow start threshold.
uint tcb_phxsum; // Precomputed pseudo-header xsum.
struct TCPSendReq *tcb_cursend; // Current send in use.
PNDIS_BUFFER tcb_sendbuf; // Current buffer chain being sent.
uint tcb_sendofs; // Offset into start of chain.
uint tcb_sendsize; // Number of bytes unsent in current send.
Queue tcb_sendq; // Queue of send requests.
// Less highly used receive sequence variables.
SeqNum tcb_sendwl1; // Window update sequence number.
SeqNum tcb_sendwl2; // Window update ack number.
struct TCPRcvReq *tcb_currcv; // Current receive buffer.
uint tcb_indicated; // Bytes of data indicated.
uint tcb_flags; // Flags for this TCB.
uint tcb_fastchk; // Fast receive path check field.
uint (*tcb_rcvhndlr)(struct TCB *, uint, struct IPRcvBuf *, uint Size); SeqNum tcb_rttseq; // Sequence number being measured for RTT.
ushort tcb_rexmit; // Rexmit value.
// Retransmit timer information. These are stored as ticks, where by
// default each tick is 100ms.
ushort tcb_smrtt; // Smoothed rtt value.
ushort tcb_delta; // Delta value.
uchar tcb_slowcount; // Count of reasons why we're on the slow path.
uchar tcb_closereason; // Reason we're closing.
IP_STATUS tcb_error; // Last error we heard about from IP.
uint tcb_rtt; // Current round trip time TS.
uint tcb_defaultwin; // Default rcv. window.
struct TCPRAHdr *tcb_raq; // Reassembly queue.
struct TCPRcvReq *tcb_rcvhead; // Head of recv. buffer queue.
struct TCPRcvReq *tcb_rcvtail; // Tail of recv. buffer queue.
uint tcb_pendingcnt; // Bytes waiting to be received.
struct IPRcvBuf *tcb_pendhead; // Head of pending recv. queue.
struct IPRcvBuf *tcb_pendtail; // Tail of pending recv. queue.
struct TCPConnReq *tcb_connreq; // Connection-type request for
// this connection.
void *tcb_conncontext; // Connection context for this
// connection.
uint tcb_bcountlow; // Low part of byte count.
uint tcb_bcounthi; // High part of bytecount.
uint tcb_totaltime; // Total number of ticks spent
// sending.
struct TCPConn *tcb_conn; // Back pointer to conn for TCB.
Queue tcb_delayq; // Queue linkage for delay queue.
void *tcb_rcvind; // Receive indication handler.
union { void *tcb_ricontext; // Receive indication context.
struct TCB *tcb_aonext; // Next pointer on AddrObj.
}; // Miscellaneous info, for IP.
IPOptInfo tcb_opt; // Option information.
RouteCacheEntry *tcb_rce; // RCE for this connection.
struct TCPConnReq *tcb_discwait; // Disc-Wait req., if there is one.
struct TCPAbortReq *tcb_abortreq; // Abort req., if there is one.
struct TCPRcvReq *tcb_exprcv; // Head of expedited recv. buffer
// queue.
struct IPRcvBuf *tcb_urgpending; // Urgent data queue.
uint tcb_urgcnt; // Byte count of data on urgent q.
uint tcb_urgind; // Urgent bytes indicated.
SeqNum tcb_urgstart; // Start of urgent data.
SeqNum tcb_urgend; // End of urgent data.
short tcb_walkcount; // Count of number of people
// 'walking' this TCB.
short tcb_unusedpendbuf; // Tracks the number of bytes
// wasted while using slist buffers.
ushort tcb_dup; // For Fast recovery algorithm
ushort tcb_force : 1; // Force next send after fast send
ushort tcb_tcpopts : 3;// rfc 1323 and 2018 options holder
ushort tcb_moreflag : 3; ushort tcb_allowedoffloads : 9; // Types of allowed offloads.
struct SACKSendBlock *tcb_SackBlock;// Sacks which needs to be sent
struct SackListEntry *tcb_SackRcvd; // Sacks which needs to be processed
short tcb_sndwinscale;// send window scale
short tcb_rcvwinscale;// receive window scale
int tcb_tsrecent; // time stamp recent
SeqNum tcb_lastack; // ack number in the last segment sent
int tcb_tsupdatetime; // Time when tsrecent was updated
void *tcb_chainedrcvind; //for chained receives
void *tcb_chainedrcvcontext;
#if GPC
ULONG tcb_GPCCachedIF; ULONG tcb_GPCCachedLink; struct RouteTableEntry *tcb_GPCCachedRTE;
#endif
#if DBG
uint tcb_LargeSend; // Counts the number of outstanding
// large-send transmit-requests
#endif
uint tcb_partition; uint tcb_connid;
// ACK behavior
uchar tcb_delackticks; uchar tcb_numdelacks; uchar tcb_rcvdsegs;
uchar tcb_bhprobecnt; // BH probe count.
// Timer wheel parameters
// The first two are one logical group called wheel state.
// They indicate which slot in the timer wheel the TCB is in,
// and it's linkage in the timer slot queue.
Queue tcb_timerwheelq; ushort tcb_timerslot : 12;
// These three variables are another logical group called timer
// state. They indicate the state of timers active on the TCB,
// tcb_timertime maintains the time at which the earliest timer
// will fire, and tcb_timertype maintains the earliest timer's
// type.
// To see why this whole thing is important, see comments after
// the TIMER_WHEEL structure definition.
ushort tcb_timertype : 4; uint tcb_timertime; uint tcb_timer[NUM_TIMERS];
#if REFERENCE_DEBUG
uint tcb_refhistory_index; TCP_REFERENCE_HISTORY tcb_refhistory[MAX_REFERENCE_HISTORY];#endif //REFERENCE_DEBUG
} TCB;
#define TIMER_WHEEL_SIZE 511
#define DUMMY_SLOT TIMER_WHEEL_SIZE
#define MAX_TIME_VALUE 0xffffffff
// The Timer wheel structure definition has:
// tw_timerslot: An array of queues, one for each timer slot.
// tw_lock: A lock protecting the complete timer wheel.
// (Contention is reduced by having as many timer
// wheels as partitions in the system).
// tw_starttick: Indicates the first time tick that has to
// be looked at.
// For e.g., if a timer routine looked at all
// TCBs firing on or before tick 5 in a pass,
// it would set tw_starttick to 6, and that is
// the point it would start processing from on
// the next pass.
typedef struct CACHE_ALIGN _Timer_Wheel { Queue tw_timerslot[TIMER_WHEEL_SIZE]; uint tw_starttick; CTELock tw_lock;} TIMER_WHEEL, *PTIMER_WHEEL;
C_ASSERT(sizeof(TIMER_WHEEL) % MAX_CACHE_LINE_SIZE == 0);C_ASSERT(__alignof(TIMER_WHEEL) == MAX_CACHE_LINE_SIZE);
// The first two functions operate on timer state (see comments in definition
// of TCB for meaning of timer state). StopTCBTimerR and StartTCBTimerR
// operate on the timer state (tcb_timertype, tcb_timertime, tcb_timer)
// atomically. A call to either of these functions will always leave wheel
// state consistent.
extern void StopTCBTimerR(TCB *StopTCB, TCP_TIMER_TYPE TimerType);extern BOOLEAN StartTCBTimerR(TCB *StartTCB, TCP_TIMER_TYPE TimerType, uint TimerValue);
// The following functions operate on the TCB's wheel state (tcb_timerwheelq
// and tcb_timerslot). A call to any of these functions changes the value
// of both the variables in such a way that they are consistent.
extern void InsertIntoTimerWheel(TCB *InsertTCB, ushort Slot);extern void RemoveFromTimerWheel(TCB *RemoveTCB);extern void RemoveAndInsertIntoTimerWheel(TCB *RemInsTCB, ushort Slot);
// The job of the inline functions below, is to sort-of act as glue, and they ensure
// that the wheel state and timer state of a TCB are in tandem with each
// other.
// STOP_TCB_TIMER_R modifies the timer state but never
// does anything to the wheel state. This means that the TCB will remain
// where it was in the timer wheel, and the timer routine will eventually
// bring the wheel state in conformance with the timer state.
extern void STOP_TCB_TIMER_R(TCB *Tcb, TCP_TIMER_TYPE Type);
// START_TCB_TIMER_R modifies the timer state and only modifies
// wheel state if the timer that was started was earlier than all the
// other timers on that TCB. This is in accordance with the lazy evaluation
// strategy.
extern void START_TCB_TIMER_R(TCB *Tcb, TCP_TIMER_TYPE Type, uint Value);
#define COMPUTE_SLOT(Time) ((Time) % TIMER_WHEEL_SIZE)
#define TCB_TIMER_FIRED_R(tcb, type, time) \
((tcb->tcb_timer[type]) && (tcb->tcb_timer[type] == time))
#define TCB_TIMER_RUNNING_R(tcb, type) (tcb->tcb_timer[type] != 0)
//* Definitions for TCP states.
#define TCB_CLOSED 0 // Closed.
#define TCB_LISTEN 1 // Listening.
#define TCB_SYN_SENT 2 // SYN Sent.
#define TCB_SYN_RCVD 3 // SYN received.
#define TCB_ESTAB 4 // Established.
#define TCB_FIN_WAIT1 5 // FIN-WAIT-1
#define TCB_FIN_WAIT2 6 // FIN-WAIT-2
#define TCB_CLOSE_WAIT 7 // Close waiting.
#define TCB_CLOSING 8 // Closing state.
#define TCB_LAST_ACK 9 // Last ack state.
#define TCB_TIME_WAIT 10 // Time wait state.
#define SYNC_STATE(s) ((s) > TCB_SYN_RCVD)
#define SYNC_RCVD_STATE(s) ((s) > TCB_SYN_SENT)
#define GRACEFUL_CLOSED_STATE(s) ((s) >= TCB_LAST_ACK)
#define DATA_RCV_STATE(s) ((s) >= TCB_ESTAB && (s) <= TCB_FIN_WAIT2)
#define DATA_SEND_STATE(s) ((s) == TCB_ESTAB || (s) == TCB_CLOSE_WAIT)
#define CONN_STATE(TcbState) ((TcbState) + 1)
C_ASSERT(TCP_CONN_CLOSED == TCB_CLOSED + 1);C_ASSERT(TCP_CONN_LISTEN == TCB_LISTEN + 1);C_ASSERT(TCP_CONN_SYN_SENT == TCB_SYN_SENT + 1);C_ASSERT(TCP_CONN_SYN_RCVD == TCB_SYN_RCVD + 1);C_ASSERT(TCP_CONN_ESTAB == TCB_ESTAB + 1);C_ASSERT(TCP_CONN_FIN_WAIT1 == TCB_FIN_WAIT1 + 1);C_ASSERT(TCP_CONN_FIN_WAIT2 == TCB_FIN_WAIT2 + 1);C_ASSERT(TCP_CONN_CLOSE_WAIT == TCB_CLOSE_WAIT + 1);C_ASSERT(TCP_CONN_CLOSING == TCB_CLOSING + 1);C_ASSERT(TCP_CONN_LAST_ACK == TCB_LAST_ACK + 1);C_ASSERT(TCP_CONN_TIME_WAIT == TCB_TIME_WAIT + 1);
//* Definitions for flags.
#define WINDOW_SET 0x00000001 // Window explictly set.
#define CLIENT_OPTIONS 0x00000002 // Have client IP options on conn.
#define CONN_ACCEPTED 0x00000004 // Connection was accepted.
#define ACTIVE_OPEN 0x00000008 // Connection came from an active
// open.
#define DISC_NOTIFIED 0x00000010 // Client has been notified of a
// disconnect.
#define IN_DELAY_Q 0x00000020 // We're in the delayed action Q.
#define RCV_CMPLTING 0x00000040 // We're completeing rcvs.
#define IN_RCV_IND 0x00000080 // We're calling a rcv. indicate
// handler.
#define NEED_RCV_CMPLT 0x00000100 // We need to have recvs. completed.
#define NEED_ACK 0x00000200 // We need to send an ACK.
#define NEED_OUTPUT 0x00000400 // We need to output.
#define DELAYED_FLAGS (NEED_RCV_CMPLT | NEED_ACK | NEED_OUTPUT)
#define ACK_DELAYED 0x00000800 // We've delayed sending an ACK.
#define PMTU_BH_PROBE 0x00001000 // We're probing for a PMTU BH.
#define BSD_URGENT 0x00002000 // We're using BSD urgent semantics.
#define IN_DELIV_URG 0x00004000 // We're in the DeliverUrgent routine.
#define URG_VALID 0x00008000 // We've seen urgent data, and
// the urgent data fields are valid.
#define FIN_NEEDED 0x00010000 // We need to send a FIN.
#define NAGLING 0x00020000 // We are using Nagle's algorithm.
#define IN_TCP_SEND 0x00040000 // We're in TCPSend.
#define FLOW_CNTLD 0x00080000 // We've received a zero window
// from our peer.
#define DISC_PENDING 0x00100000 // A disconnect notification is
// pending.
#define TW_PENDING 0x00200000 // We're waiting to finish going
// to TIME-WAIT.
#define FORCE_OUTPUT 0x00400000 // Output is being forced.
#define FORCE_OUT_SHIFT 22 // Shift to get FORCE_OUTPUT into
// low bit.
#define SEND_AFTER_RCV 0x00800000 // We need to send after we get out
// of recv.
#define GC_PENDING 0x01000000 // A graceful close is pending.
#define KEEPALIVE 0x02000000 // Doing keepalives on this TCB.
#define URG_INLINE 0x04000000 // Urgent data to be processed
// inline.
#define SCALE_CWIN 0x08000000 // Increment CWin proportionally to
// amount of data acknowledged.
#define FIN_OUTSTANDING 0x10000000 // We've sent a FIN 'recently', i.e.
// since the last retransmit. When
// this flag is set sendnext ==
// sendmax.
#define FIN_OUTS_SHIFT 28 // Shift to FIN_OUTSTANDING bit into
// low bit.
#define FIN_SENT 0x20000000 // We've sent a FIN that hasn't
// been acknowledged. Once this
// bit has been turned on in
// FIN-WAIT-1 the sequence number
// of the FIN will be sendmax-1.
#define NEED_RST 0x40000000 // We need to send a RST when
// closing.
#define IN_TCB_TABLE 0x80000000 // TCB is in the TCB table.
#define IN_TWTCB_TABLE 0x80000000
#define IN_TWQUEUE 0x00000001
// N.B. SYNTCB flags share the same bits as TCB flags.
#define IN_SYNTCB_TABLE IN_TCB_TABLE
#define SYNTCB_SHARED_FLAGS (CONN_ACCEPTED | WINDOW_SET)
//* The defintion of the 'slow flags'. If any of these flags are set we'll
// be forced off of the fast path.
#define TCP_SLOW_FLAGS (URG_VALID | FLOW_CNTLD | GC_PENDING | \
TW_PENDING | DISC_NOTIFIED | IN_DELIV_URG | \ FIN_NEEDED | FIN_SENT | FIN_OUTSTANDING | \ DISC_PENDING | PMTU_BH_PROBE)
//* Close reasons.
#define TCB_CLOSE_RST 0x80 // Received a RST segment.
#define TCB_CLOSE_ABORTED 0x40 // Had a local abort.
#define TCB_CLOSE_TIMEOUT 0x20 // Connection timed out.
#define TCB_CLOSE_REFUSED 0x10 // Connect attempt was refused.
#define TCB_CLOSE_UNREACH 0x08 // Remote destination unreachable.
#define TCB_CLOSE_SUCCESS 0x01 // Successfull close.
//* TCB Timer macros.
#define START_TCB_TIMER(t, v) (t) = (v)
#define STOP_TCB_TIMER(t) (t) = 0
#define TCB_TIMER_RUNNING(t) ((t) != 0)
// Macro to compute retransmit timeout.
#define REXMIT_TO(t) ((((t)->tcb_smrtt >> 2) + (t)->tcb_delta) >> 1)
//* Definitons for pending actions. We define a PENDING_ACTION macro
// that can be used to decide whether or not we can proceed with an
// activity. The only pending action we really care about is DELETE - others
// are low priority and can be put off.
#define PENDING_ACTION(t) ((t)->tcb_pending & DEL_PENDING)
#define DEL_PENDING 0x01 // Delete is pending.
#define OPT_PENDING 0x02 // Option set is pending.
#define FREE_PENDING 0x04 // Can be freed
#define RST_PENDING 0x08 // RST-indication is pending.
//* Macro to see if a TCB is closing.
#define CLOSING(t) ((t)->tcb_pending & DEL_PENDING)
//* Structure of a TCP packet header.
struct TCPHeader { ushort tcp_src; // Source port.
ushort tcp_dest; // Destination port.
SeqNum tcp_seq; // Sequence number.
SeqNum tcp_ack; // Ack number.
ushort tcp_flags; // Flags and data offset.
ushort tcp_window; // Window offered.
ushort tcp_xsum; // Checksum.
ushort tcp_urgent; // Urgent pointer.
};
typedef struct TCPHeader TCPHeader;
//* Definitions for header flags.
#define TCP_FLAG_FIN 0x00000100
#define TCP_FLAG_SYN 0x00000200
#define TCP_FLAG_RST 0x00000400
#define TCP_FLAG_PUSH 0x00000800
#define TCP_FLAG_ACK 0x00001000
#define TCP_FLAG_URG 0x00002000
#define TCP_FLAGS_ALL (TCP_FLAG_FIN | TCP_FLAG_SYN | TCP_FLAG_RST | \
TCP_FLAG_ACK | TCP_FLAG_URG)
//* Flags in the tcb_fastchk field that are not in the TCP header proper.
// Setting these flags forces us off the fast path.
#define TCP_FLAG_SLOW 0x00000001 // Need to be on slow path.
#define TCP_FLAG_IN_RCV 0x00000002 // In recv. path already.
#define TCP_FLAG_FASTREC 0x00000004 // This is used to mark tcb
#define TCP_FLAG_SEND_AND_DISC 0x00000008
// former tcb_flag2 flags, now in tcb_fastchk
#define TCP_FLAG_ACCEPT_PENDING 0x00000010
#define TCP_FLAG_REQUEUE_FROM_SEND_AND_DISC 0x00000020
#define TCP_FLAG_RST_WHILE_SYN 0x00000040 // Valid RST was received while
// establishing outboud connct.
#define TCP_OFFSET_MASK 0xf0
#define TCP_HDR_SIZE(t) (uint)(((*(uchar *)&(t)->tcp_flags) & TCP_OFFSET_MASK) >> 2)
#define MAKE_TCP_FLAGS(o, f) ((f) | ((o) << 4))
#define TCP_OPT_EOL 0
#define TCP_OPT_NOP 1
#define TCP_OPT_MSS 2
#define MSS_OPT_SIZE 4
#define TCP_SACK_PERMITTED_OPT 4
#define SACK_PERMITTED_OPT_SIZE 2 // SACK "permitted" option size, in SYN segments
#define TCP_FLAG_SACK 0x00000004
#define TCP_OPT_SACK 5 // Sack option
#define ALIGNED_TS_OPT_SIZE 12
#define TCP_OPT_WS 3 // Window scale option
#define TCP_OPT_TS 8 // Time stamp option
#define WS_OPT_SIZE 3
#define TS_OPT_SIZE 10
#define TCP_MAXWIN 65535 // maximum unscaled window size
#define TCP_MAX_SCALED_WIN 0x3fffffff // maximum window with scaling
#define TCP_MAX_WINSHIFT 14 // Maximum shift allowed
#define TCP_MAX_SCALED_WIN 0x3fffffff // maximum window with scaling.
#define TCP_FLAG_WS 0x00000001 // Flags in tcb_options for ws and ts
#define TCP_FLAG_TS 0x00000002
#define PAWS_IDLE 24*24*60*60*100 // Paws idle time - 24 days
//* Convenient byte swapped structure for receives.
struct TCPRcvInfo { SeqNum tri_seq; // Sequence number.
SeqNum tri_ack; // Ack number.
uint tri_window; // Window.
uint tri_urgent; // Urgent pointer.
uint tri_flags; // Flags.
};
typedef struct TCPRcvInfo TCPRcvInfo;
//* General structure, at the start of all command specific request structures.
#define tr_signature 0x20205254 // 'TR '
struct TCPReq {#if DBG
ulong tr_sig;#endif
struct Queue tr_q; // Q linkage.
CTEReqCmpltRtn tr_rtn; // Completion routine.
PVOID tr_context; // User context.
int tr_status; // Final complete status.
};
typedef struct TCPReq TCPReq;// structures to support SACK
struct SackSeg { SeqNum begin; SeqNum end;};typedef struct SackSeg SackSeg;
// Maximum 4 sack entries can be sent
// so, size sack send block acordingly
struct SACKSendBlock { uchar Mask[4]; SackSeg Block[4];};typedef struct SACKSendBlock SACKSendBlock;
// list of received sack entries
struct SackListEntry { struct SackListEntry *next; SeqNum begin; SeqNum end;};typedef struct SackListEntry SackListEntry;
struct ReservedPortListEntry { struct ReservedPortListEntry *next; ushort UpperRange; ushort LowerRange;};typedef struct ReservedPortListEntry ReservedPortListEntry;
#ifdef POOL_TAGGING
#ifdef ExAllocatePool
#undef ExAllocatePool
#endif
#ifdef CTEAllocMemN
#undef CTEAllocMemN
#endif
#define ExAllocatePool(type, size) ExAllocatePoolWithTag(type, size, 'tPCT')
#ifndef CTEAllocMem
#error "CTEAllocMem is not already defined - will override tagging"
#else
#undef CTEAllocMem
#endif
#ifdef CTEAllocMemBoot
#undef CTEAllocMemBoot
#endif
#if MILLEN
#define CTEAllocMem(size) ExAllocatePoolWithTag(NonPagedPool, size, 'tPCT')
#define CTEAllocMemN(size,tag) ExAllocatePoolWithTag(NonPagedPool, size, tag)
#define CTEAllocMemLow(size,tag) ExAllocatePoolWithTag(NonPagedPool, size, tag)
#define CTEAllocMemBoot(size) ExAllocatePoolWithTag(NonPagedPool, size, 'tPCT')
#else // MILLEN
#define CTEAllocMem(size) ExAllocatePoolWithTagPriority(NonPagedPool, size, 'tPCT', NormalPoolPriority)
#define CTEAllocMemN(size,tag) ExAllocatePoolWithTagPriority(NonPagedPool, size, tag,NormalPoolPriority)
#define CTEAllocMemLow(size,tag) ExAllocatePoolWithTagPriority(NonPagedPool, size, tag,LowPoolPriority)
#define CTEAllocMemBoot(size) ExAllocatePoolWithTag(NonPagedPool, size, 'tPCT')
#endif // !MILLEN
#endif // POOL_TAGGING
#if TRACE_EVENT
#define _WMIKM_
#include "evntrace.h"
#include "wmikm.h"
#include "wmistr.h"
#define EVENT_TRACE_GROUP_TCPIP 0x0600
#define EVENT_TRACE_GROUP_UDPIP 0x0800
typedef VOID (*PTDI_DATA_REQUEST_NOTIFY_ROUTINE)( IN ULONG EventType, IN PVOID DataBlock, IN ULONG Size, IN PETHREAD Thread);
extern PTDI_DATA_REQUEST_NOTIFY_ROUTINE TCPCPHandlerRoutine;
typedef struct _CPTRACE_DATABLOCK { IPAddr saddr; IPAddr daddr; ushort sport; ushort dport; uint size; HANDLE cpcontext;} CPTRACE_DATABLOCK, *PCPTRACE_BLOCK;#endif
//
// TCP endpoint context structure allocated for each open of TCP/UDP.
// A pointer to this structure is stored in FileObject->FsContext.
//
typedef struct _TCP_CONTEXT { union { HANDLE AddressHandle; CONNECTION_CONTEXT ConnectionContext; HANDLE ControlChannel; } Handle; ULONG ReferenceCount; BOOLEAN CancelIrps; BOOLEAN Cleanup;#if DBG
LIST_ENTRY PendingIrpList; LIST_ENTRY CancelledIrpList;#endif
KEVENT CleanupEvent; UINT_PTR Conn; PIRP Irp; DEFINE_LOCK_STRUCTURE(EndpointLock)} TCP_CONTEXT, *PTCP_CONTEXT;
#define MAJOR_TDI_VERSION 2
#define MINOR_TDI_VERSION 0
extern HANDLE DgHeaderPool;
//* Definition of an AO request structure. There structures are used only for
// queuing delete and option get/set requests.
#define aor_signature 0x20524F41
typedef struct AORequest { struct AODeleteRequest {#if DBG
ulong aor_sig;#endif
CTEReqCmpltRtn aor_rtn; // Request complete routine for
// this request.
PVOID aor_context; // Request context.
uint aor_type; // Request type.
}; struct AORequest *aor_next; // Next pointer in chain.
uint aor_id; // ID for the request.
uint aor_length; // Length of buffer.
void *aor_buffer; // Buffer for this request.
} AORequest;
//
// Values of aor_type
//
#define AOR_TYPE_GET_OPTIONS 1
#define AOR_TYPE_SET_OPTIONS 2
#define AOR_TYPE_REVALIDATE_MCAST 3
#define AOR_TYPE_DELETE 4
#define AOR_TYPE_CONNECT 5
#define AOR_TYPE_DISCONNECT 6
extern AORequest *AORequestBlockPtr;
#include "tcpdeb.h"
#if REFERENCE_DEBUG
uintTcpReferenceTCB ( IN TCB *RefTCB, IN uchar *File, IN uint Line );
uintTcpDereferenceTCB ( IN TCB *DerefTCB, IN uchar *File, IN uint Line );
#define REFERENCE_TCB(_a) TcpReferenceTCB((_a), (PUCHAR)__FILE__, __LINE__)
#define DEREFERENCE_TCB(_a) TcpDereferenceTCB((_a), (PUCHAR)__FILE__, __LINE__)
#else // REFERENCE_DEBUG
#define REFERENCE_TCB(_a) ++(_a)->tcb_refcnt
#define DEREFERENCE_TCB(_a) --(_a)->tcb_refcnt
#endif // REFERENCE_DEBUG
#endif // _TCP_INCLUDED_
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