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1943 lines
73 KiB
1943 lines
73 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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// TCP deliver data code.
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//
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// This file contains the code for delivering data to the user, including
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// putting data into recv. buffers and calling indication handlers.
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//
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#include "oscfg.h"
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#include "ndis.h"
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#include "ip6imp.h"
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#include "ip6def.h"
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#include "tdi.h"
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#include "tdint.h"
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#include "tdistat.h"
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#include "queue.h"
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#include "transprt.h"
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#include "addr.h"
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#include "tcp.h"
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#include "tcb.h"
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#include "tcprcv.h"
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#include "tcpsend.h"
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#include "tcpconn.h"
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#include "tcpdeliv.h"
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#include "route.h"
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extern KSPIN_LOCK AddrObjTableLock;
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extern uint
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PutOnRAQ(TCB *RcvTCB, TCPRcvInfo *RcvInfo, IPv6Packet *Packet, uint Size);
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extern IPv6Packet *
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TrimPacket(IPv6Packet *Packet, uint AmountToTrim);
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SLIST_HEADER TCPRcvReqFree; // Rcv req. free list.
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KSPIN_LOCK TCPRcvReqFreeLock; // Protects rcv req free list.
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uint NumTCPRcvReq = 0; // Current number of RcvReqs in system.
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uint MaxRcvReq = 0xffffffff; // Maximum allowed number of SendReqs.
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NTSTATUS TCPPrepareIrpForCancel(PTCP_CONTEXT TcpContext, PIRP Irp,
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PDRIVER_CANCEL CancelRoutine);
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ULONG TCPGetMdlChainByteCount(PMDL Mdl);
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void TCPDataRequestComplete(void *Context, unsigned int Status,
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unsigned int ByteCount);
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VOID TCPCancelRequest(PDEVICE_OBJECT Device, PIRP Irp);
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VOID CompleteRcvs(TCB *CmpltTCB);
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//* FreeRcvReq - Free a rcv request structure.
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//
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// Called to free a rcv request structure.
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//
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void // Returns: Nothing.
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FreeRcvReq(
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TCPRcvReq *FreedReq) // Rcv request structure to be freed.
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{
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PSLIST_ENTRY BufferLink;
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CHECK_STRUCT(FreedReq, trr);
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BufferLink = CONTAINING_RECORD(&(FreedReq->trr_next), SLIST_ENTRY,
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Next);
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ExInterlockedPushEntrySList(&TCPRcvReqFree, BufferLink,
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&TCPRcvReqFreeLock);
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}
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//* GetRcvReq - Get a recv. request structure.
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//
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// Called to get a rcv. request structure.
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//
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TCPRcvReq * // Returns: Pointer to RcvReq structure, or NULL if none.
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GetRcvReq(
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void) // Nothing.
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{
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TCPRcvReq *Temp;
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PSLIST_ENTRY BufferLink;
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BufferLink = ExInterlockedPopEntrySList(&TCPRcvReqFree,
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&TCPRcvReqFreeLock);
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if (BufferLink != NULL) {
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Temp = CONTAINING_RECORD(BufferLink, TCPRcvReq, trr_next);
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CHECK_STRUCT(Temp, trr);
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} else {
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if (NumTCPRcvReq < MaxRcvReq)
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Temp = ExAllocatePool(NonPagedPool, sizeof(TCPRcvReq));
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else
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Temp = NULL;
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if (Temp != NULL) {
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ExInterlockedAddUlong(&NumTCPRcvReq, 1, &TCPRcvReqFreeLock);
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#if DBG
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Temp->trr_sig = trr_signature;
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#endif
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}
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}
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return Temp;
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}
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//* FindLastPacket - Find the last packet in a chain.
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//
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// A utility routine to find the last packet in a packet chain.
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//
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IPv6Packet * // Returns: Pointer to last packet in chain.
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FindLastPacket(
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IPv6Packet *Packet) // Pointer to packet chain.
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{
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ASSERT(Packet != NULL);
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while (Packet->Next != NULL)
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Packet = Packet->Next;
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return Packet;
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}
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//* CovetPacketChain - Take owership of a chain of IP packets.
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//
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// Called to seize ownership of a chain of IP packets. We copy any
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// packets that are not already owned by us. We assume that all packets
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// not belonging to us start before those that do, so we quit copying
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// when we reach a packet we own.
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//
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IPv6Packet * // Returns: Pointer to new packet chain.
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CovetPacketChain(
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IPv6Packet *OrigPkt, // Packet chain to copy from.
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IPv6Packet **LastPkt, // Where to return pointer to last packet in chain.
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uint Size) // Maximum size in bytes to seize.
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{
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IPv6Packet *FirstPkt, *EndPkt;
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uint BytesToCopy;
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ASSERT(OrigPkt != NULL);
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ASSERT(Size > 0);
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if (!(OrigPkt->Flags & PACKET_OURS)) {
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BytesToCopy = MIN(Size, OrigPkt->TotalSize);
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FirstPkt = ExAllocatePoolWithTagPriority(NonPagedPool,
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sizeof(IPv6Packet) +
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BytesToCopy, TCP6_TAG,
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LowPoolPriority);
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if (FirstPkt != NULL) {
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EndPkt = FirstPkt;
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FirstPkt->Next = NULL;
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FirstPkt->Position = 0;
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FirstPkt->FlatData = (uchar *)(FirstPkt + 1);
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FirstPkt->Data = FirstPkt->FlatData;
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FirstPkt->ContigSize = BytesToCopy;
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FirstPkt->TotalSize = BytesToCopy;
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FirstPkt->NdisPacket = NULL;
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FirstPkt->AuxList = NULL;
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FirstPkt->Flags = PACKET_OURS;
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CopyPacketToBuffer(FirstPkt->Data, OrigPkt, BytesToCopy,
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OrigPkt->Position);
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Size -= BytesToCopy;
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OrigPkt = OrigPkt->Next;
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while (OrigPkt != NULL && !(OrigPkt->Flags & PACKET_OURS)
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&& Size != 0) {
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IPv6Packet *NewPkt;
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BytesToCopy = MIN(Size, OrigPkt->TotalSize);
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NewPkt = ExAllocatePoolWithTagPriority(NonPagedPool,
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sizeof(IPv6Packet) +
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BytesToCopy, TCP6_TAG,
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LowPoolPriority);
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if (NewPkt != NULL) {
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NewPkt->Next = NULL;
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NewPkt->Position = 0;
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NewPkt->FlatData = (uchar *)(NewPkt + 1);
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NewPkt->Data = NewPkt->FlatData;
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NewPkt->ContigSize = BytesToCopy;
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NewPkt->TotalSize = BytesToCopy;
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NewPkt->Flags = PACKET_OURS;
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NewPkt->NdisPacket = NULL;
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NewPkt->AuxList = NULL;
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CopyPacketToBuffer(NewPkt->Data, OrigPkt, BytesToCopy,
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OrigPkt->Position);
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EndPkt->Next = NewPkt;
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EndPkt = NewPkt;
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Size -= BytesToCopy;
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OrigPkt = OrigPkt->Next;
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} else {
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FreePacketChain(FirstPkt);
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return NULL;
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}
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}
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EndPkt->Next = OrigPkt;
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} else
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return NULL;
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} else {
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FirstPkt = OrigPkt;
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EndPkt = OrigPkt;
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if (Size < OrigPkt->TotalSize) {
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OrigPkt->TotalSize = Size;
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OrigPkt->ContigSize = Size;
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}
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Size -= OrigPkt->TotalSize;
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}
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//
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// Now walk down the chain, until we run out of Size.
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// At this point, Size is the bytes left to 'seize' (it may be 0),
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// and the sizes in packets FirstPkt...EndPkt are correct.
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//
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while (Size != 0) {
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EndPkt = EndPkt->Next;
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ASSERT(EndPkt != NULL);
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if (Size < EndPkt->TotalSize) {
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EndPkt->TotalSize = Size;
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EndPkt->ContigSize = Size;
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}
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Size -= EndPkt->TotalSize;
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}
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// If there's anything left in the chain, free it now.
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if (EndPkt->Next != NULL) {
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FreePacketChain(EndPkt->Next);
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EndPkt->Next = NULL;
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}
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*LastPkt = EndPkt;
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return FirstPkt;
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}
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//* PendData - Pend incoming data to a client.
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//
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// Called when we need to buffer data for a client because there's no receive
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// down and we can't indicate.
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//
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// The TCB lock is held throughout this procedure. If this is to be changed,
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// make sure consistency of tcb_pendingcnt is preserved. This routine is
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// always called at DPC level.
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//
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uint // Returns: Number of bytes of data taken.
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PendData(
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TCB *RcvTCB, // TCB on which to receive the data.
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uint RcvFlags, // TCP flags for the incoming packet.
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IPv6Packet *InPacket, // Input buffer of packet.
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uint Size) // Size in bytes of data in InPacket.
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{
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IPv6Packet *NewPkt, *LastPkt;
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CHECK_STRUCT(RcvTCB, tcb);
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ASSERT(Size > 0);
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ASSERT(InPacket != NULL);
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ASSERT(RcvTCB->tcb_refcnt != 0);
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ASSERT(RcvTCB->tcb_fastchk & TCP_FLAG_IN_RCV);
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ASSERT(RcvTCB->tcb_currcv == NULL);
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ASSERT(RcvTCB->tcb_rcvhndlr == PendData);
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CheckPacketList(RcvTCB->tcb_pendhead, RcvTCB->tcb_pendingcnt);
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NewPkt = CovetPacketChain(InPacket, &LastPkt, Size);
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if (NewPkt != NULL) {
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//
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// We have a duplicate chain. Put it on the end of the pending q.
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//
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if (RcvTCB->tcb_pendhead == NULL) {
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RcvTCB->tcb_pendhead = NewPkt;
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RcvTCB->tcb_pendtail = LastPkt;
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} else {
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RcvTCB->tcb_pendtail->Next = NewPkt;
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RcvTCB->tcb_pendtail = LastPkt;
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}
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RcvTCB->tcb_pendingcnt += Size;
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} else {
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FreePacketChain(InPacket);
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Size = 0;
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}
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CheckPacketList(RcvTCB->tcb_pendhead, RcvTCB->tcb_pendingcnt);
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return Size;
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}
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//* BufferData - Put incoming data into client's buffer.
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//
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// Called when we believe we have a buffer into which we can put data. We put
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// it in there, and if we've filled the buffer or the incoming data has the
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// push flag set we'll mark the TCB to return the buffer. Otherwise we'll
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// get out and return the data later.
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//
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// In NT, this routine is called with the TCB lock held, and holds it for
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// the duration of the call. This is important to ensure consistency of
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// the tcb_pendingcnt field. If we need to change this to free the lock
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// partway through, make sure to take this into account. In particular,
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// TdiReceive zeros pendingcnt before calling this routine, and this routine
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// may update it. If the lock is freed in here there would be a window where
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// we really do have pending data, but it's not on the list or reflected in
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// pendingcnt. This could mess up our windowing computations, and we'd have
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// to be careful not to end up with more data pending than our window allows.
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//
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uint // Returns: Number of bytes of data taken.
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BufferData(
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TCB *RcvTCB, // TCB on which to receive the data.
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uint RcvFlags, // TCP rcv flags for the incoming packet.
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IPv6Packet *InPacket, // Input buffer of packet.
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uint Size) // Size in bytes of data in InPacket.
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{
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uchar *DestPtr; // Destination pointer.
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uchar *SrcPtr; // Src pointer.
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uint SrcSize; // Size of current source buffer.
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uint DestSize; // Size of current destination buffer.
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uint Copied; // Total bytes to copy.
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uint BytesToCopy; // Bytes of data to copy this time.
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TCPRcvReq *DestReq; // Current receive request.
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IPv6Packet *SrcPkt; // Current source packet.
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PNDIS_BUFFER DestBuf; // Current receive buffer.
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uint RcvCmpltd;
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uint Flags;
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CHECK_STRUCT(RcvTCB, tcb);
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ASSERT(Size > 0);
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ASSERT(InPacket != NULL);
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ASSERT(RcvTCB->tcb_refcnt != 0);
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ASSERT(RcvTCB->tcb_rcvhndlr == BufferData);
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//
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// In order to copy the received data to the application's buffers,
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// we now need to map those buffers into the system's address space.
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// Rather than attempting to map them below, where the going gets rough,
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// we do it up-front where errors may be more readily handled.
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//
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// N.B. We map one buffer beyond what we need, since the code below
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// will update the current receive-request to point beyond the data copied.
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//
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Copied = 0;
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for (DestReq = RcvTCB->tcb_currcv; DestReq; DestReq = DestReq->trr_next) {
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uint DestAvail = DestReq->trr_size - DestReq->trr_amt;
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for (DestBuf = DestReq->trr_buffer, DestSize = DestReq->trr_offset;
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DestBuf && DestAvail && Copied < Size;
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DestBuf = NDIS_BUFFER_LINKAGE(DestBuf), DestSize = 0) {
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if (!NdisBufferVirtualAddressSafe(DestBuf, NormalPagePriority)) {
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return 0;
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}
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DestSize = MIN(NdisBufferLength(DestBuf) - DestSize, DestAvail);
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DestAvail -= DestSize;
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Copied += DestSize;
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}
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if (Copied >= Size) {
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//
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// We've mapped the space into which we'll copy;
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// now map the space immediately beyond that.
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//
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if (DestAvail) {
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//
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// We believe space remains in the current receive-request;
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// DestBuf should point to the current buffer.
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//
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ASSERT(DestBuf);
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} else if ((DestReq = DestReq->trr_next) != NULL) {
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//
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// No more space in that receive-request, but there's another;
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// Move to this next one, and map the start of that.
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//
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DestBuf = DestReq->trr_buffer;
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} else {
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break;
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}
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if (!NdisBufferVirtualAddressSafe(DestBuf, NormalPagePriority)) {
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return 0;
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}
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break;
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}
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}
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Copied = 0;
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RcvCmpltd = 0;
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DestReq = RcvTCB->tcb_currcv;
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ASSERT(DestReq != NULL);
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CHECK_STRUCT(DestReq, trr);
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DestBuf = DestReq->trr_buffer;
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DestSize = MIN(NdisBufferLength(DestBuf) - DestReq->trr_offset,
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DestReq->trr_size - DestReq->trr_amt);
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DestPtr = (uchar *)NdisBufferVirtualAddress(DestBuf) + DestReq->trr_offset;
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SrcPkt = InPacket;
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SrcSize = SrcPkt->TotalSize;
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Flags = (RcvFlags & TCP_FLAG_PUSH) ? TRR_PUSHED : 0;
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RcvCmpltd = Flags;
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DestReq->trr_flags |= Flags;
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do {
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BytesToCopy = MIN(Size - Copied, MIN(SrcSize, DestSize));
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CopyPacketToBuffer(DestPtr, SrcPkt, BytesToCopy, SrcPkt->Position);
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Copied += BytesToCopy;
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DestReq->trr_amt += BytesToCopy;
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// Update our source pointers.
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if ((SrcSize -= BytesToCopy) == 0) {
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IPv6Packet *TempPkt;
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// We've copied everything in this packet.
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TempPkt = SrcPkt;
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SrcPkt = SrcPkt->Next;
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if (Size != Copied) {
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ASSERT(SrcPkt != NULL);
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SrcSize = SrcPkt->TotalSize;
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}
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TempPkt->Next = NULL;
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FreePacketChain(TempPkt);
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} else {
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if (BytesToCopy < SrcPkt->ContigSize) {
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//
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// We have a contiguous region, easy to skip forward.
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//
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AdjustPacketParams(SrcPkt, BytesToCopy);
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} else {
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//
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// REVIEW: This method isn't very efficient.
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//
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PositionPacketAt(SrcPkt, SrcPkt->Position + BytesToCopy);
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}
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}
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// Now check the destination pointer, and update it if we need to.
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if ((DestSize -= BytesToCopy) == 0) {
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uint DestAvail;
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// Exhausted this buffer. See if there's another one.
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DestAvail = DestReq->trr_size - DestReq->trr_amt;
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DestBuf = NDIS_BUFFER_LINKAGE(DestBuf);
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if (DestBuf != NULL && (DestAvail != 0)) {
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// Have another buffer in the chain. Update things.
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DestSize = MIN(NdisBufferLength(DestBuf), DestAvail);
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DestPtr = (uchar *)NdisBufferVirtualAddress(DestBuf);
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} else {
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// No more buffers in the chain. See if we have another buffer
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// on the list.
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DestReq->trr_flags |= TRR_PUSHED;
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// If we've been told there's to be no back traffic, get an ACK
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// going right away.
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if (DestReq->trr_flags & TDI_RECEIVE_NO_RESPONSE_EXP)
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DelayAction(RcvTCB, NEED_ACK);
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RcvCmpltd = TRUE;
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DestReq = DestReq->trr_next;
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if (DestReq != NULL) {
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DestBuf = DestReq->trr_buffer;
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DestSize = MIN(NdisBufferLength(DestBuf),
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DestReq->trr_size);
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DestPtr = (uchar *)NdisBufferVirtualAddress(DestBuf);
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// If we have more to put into here, set the flags.
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if (Copied != Size)
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DestReq->trr_flags |= Flags;
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} else {
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// All out of buffer space. Reset the data handler pointer.
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break;
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}
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}
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} else
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// Current buffer not empty yet.
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DestPtr += BytesToCopy;
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// If we've copied all that we need to, we're done.
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} while (Copied != Size);
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//
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// We've finished copying, and have a few more things to do. We need to
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// update the current rcv. pointer and possibly the offset in the
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// recv. request. If we need to complete any receives we have to schedule
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// that. If there's any data we couldn't copy we'll need to dispose of it.
|
|
//
|
|
RcvTCB->tcb_currcv = DestReq;
|
|
if (DestReq != NULL) {
|
|
DestReq->trr_buffer = DestBuf;
|
|
DestReq->trr_offset = (uint) (DestPtr - (uchar *) NdisBufferVirtualAddress(DestBuf));
|
|
RcvTCB->tcb_rcvhndlr = BufferData;
|
|
} else
|
|
RcvTCB->tcb_rcvhndlr = PendData;
|
|
|
|
RcvTCB->tcb_indicated -= MIN(Copied, RcvTCB->tcb_indicated);
|
|
|
|
if (Size != Copied) {
|
|
IPv6Packet *NewPkt, *LastPkt;
|
|
|
|
ASSERT(DestReq == NULL);
|
|
|
|
// We have data to dispose of. Update the first buffer of the chain
|
|
// with the current src pointer and size, and copy it.
|
|
ASSERT(SrcSize <= SrcPkt->TotalSize);
|
|
|
|
NewPkt = CovetPacketChain(SrcPkt, &LastPkt, Size - Copied);
|
|
if (NewPkt != NULL) {
|
|
// We managed to copy the chain. Push it on the pending queue.
|
|
if (RcvTCB->tcb_pendhead == NULL) {
|
|
RcvTCB->tcb_pendhead = NewPkt;
|
|
RcvTCB->tcb_pendtail = LastPkt;
|
|
} else {
|
|
LastPkt->Next = RcvTCB->tcb_pendhead;
|
|
RcvTCB->tcb_pendhead = NewPkt;
|
|
}
|
|
RcvTCB->tcb_pendingcnt += Size - Copied;
|
|
Copied = Size;
|
|
|
|
CheckPacketList(RcvTCB->tcb_pendhead, RcvTCB->tcb_pendingcnt);
|
|
|
|
} else
|
|
FreePacketChain(SrcPkt);
|
|
} else {
|
|
// We copied Size bytes, but the chain could be longer than that. Free
|
|
// it if we need to.
|
|
if (SrcPkt != NULL)
|
|
FreePacketChain(SrcPkt);
|
|
}
|
|
|
|
if (RcvCmpltd != 0) {
|
|
DelayAction(RcvTCB, NEED_RCV_CMPLT);
|
|
} else {
|
|
START_TCB_TIMER(RcvTCB->tcb_pushtimer, PUSH_TO);
|
|
}
|
|
|
|
return Copied;
|
|
}
|
|
|
|
|
|
//* IndicateData - Indicate incoming data to a client.
|
|
//
|
|
// Called when we need to indicate data to an upper layer client. We'll pass
|
|
// up a pointer to whatever we have available, and the client may take some
|
|
// or all of it.
|
|
//
|
|
uint // Returns: Number of bytes of data taken.
|
|
IndicateData(
|
|
TCB *RcvTCB, // TCB on which to receive the data.
|
|
uint RcvFlags, // TCP receive flags for the incoming packet.
|
|
IPv6Packet *InPacket, // Input buffer of packet.
|
|
uint Size) // Size in bytes of data in InPacket.
|
|
{
|
|
TDI_STATUS Status;
|
|
PRcvEvent Event;
|
|
PVOID EventContext, ConnContext;
|
|
uint BytesTaken = 0;
|
|
EventRcvBuffer *ERB = NULL;
|
|
PTDI_REQUEST_KERNEL_RECEIVE RequestInformation;
|
|
PIO_STACK_LOCATION IrpSp;
|
|
TCPRcvReq *RcvReq;
|
|
ulong IndFlags;
|
|
|
|
CHECK_STRUCT(RcvTCB, tcb);
|
|
ASSERT(Size > 0);
|
|
ASSERT(InPacket != NULL);
|
|
ASSERT(RcvTCB->tcb_refcnt != 0);
|
|
ASSERT(RcvTCB->tcb_fastchk & TCP_FLAG_IN_RCV);
|
|
ASSERT(RcvTCB->tcb_rcvind != NULL);
|
|
ASSERT(RcvTCB->tcb_rcvhead == NULL);
|
|
ASSERT(RcvTCB->tcb_rcvhndlr == IndicateData);
|
|
|
|
RcvReq = GetRcvReq();
|
|
if (RcvReq != NULL) {
|
|
//
|
|
// The indicate handler is saved in the TCB. Just call up into it.
|
|
//
|
|
Event = RcvTCB->tcb_rcvind;
|
|
EventContext = RcvTCB->tcb_ricontext;
|
|
ConnContext = RcvTCB->tcb_conncontext;
|
|
|
|
RcvTCB->tcb_indicated = Size;
|
|
RcvTCB->tcb_flags |= IN_RCV_IND;
|
|
|
|
KeReleaseSpinLockFromDpcLevel(&RcvTCB->tcb_lock);
|
|
|
|
//
|
|
// If we're at the end of a contigous data region,
|
|
// move forward to the next one. This prevents us
|
|
// from making nonsensical zero byte indications.
|
|
//
|
|
if (InPacket->ContigSize == 0) {
|
|
PacketPullupSubr(InPacket, 0, 1, 0);
|
|
}
|
|
|
|
IF_TCPDBG(TCP_DEBUG_RECEIVE) {
|
|
KdPrintEx((DPFLTR_TCPIP6_ID, DPFLTR_INFO_TCPDBG,
|
|
"Indicating %lu bytes, %lu available\n",
|
|
MIN(InPacket->ContigSize, Size), Size));
|
|
}
|
|
|
|
#if TCP_FLAG_PUSH >= TDI_RECEIVE_ENTIRE_MESSAGE
|
|
IndFlags = TDI_RECEIVE_COPY_LOOKAHEAD | TDI_RECEIVE_NORMAL |
|
|
TDI_RECEIVE_AT_DISPATCH_LEVEL |
|
|
((RcvFlags & TCP_FLAG_PUSH) >>
|
|
((TCP_FLAG_PUSH / TDI_RECEIVE_ENTIRE_MESSAGE) - 1));
|
|
#else
|
|
IndFlags = TDI_RECEIVE_COPY_LOOKAHEAD | TDI_RECEIVE_NORMAL |
|
|
TDI_RECEIVE_AT_DISPATCH_LEVEL |
|
|
((RcvFlags & TCP_FLAG_PUSH) <<
|
|
((TDI_RECEIVE_ENTIRE_MESSAGE / TCP_FLAG_PUSH) - 1));
|
|
#endif
|
|
|
|
Status = (*Event)(EventContext, ConnContext, IndFlags,
|
|
MIN(InPacket->ContigSize, Size), Size, &BytesTaken,
|
|
InPacket->Data, &ERB);
|
|
|
|
IF_TCPDBG(TCP_DEBUG_RECEIVE) {
|
|
KdPrintEx((DPFLTR_TCPIP6_ID, DPFLTR_INFO_TCPDBG,
|
|
"%lu bytes taken, status %lx\n", BytesTaken, Status));
|
|
}
|
|
|
|
//
|
|
// See what the client did. If the return status is MORE_PROCESSING,
|
|
// we've been given a buffer. In that case put it on the front of the
|
|
// buffer queue, and if all the data wasn't taken go ahead and copy
|
|
// it into the new buffer chain.
|
|
//
|
|
// Note that the size and buffer chain we're concerned with here is
|
|
// the one that we passed to the client. Since we're in a recieve
|
|
// handler, any data that has come in would have been put on the
|
|
// reassembly queue.
|
|
//
|
|
if (Status == TDI_MORE_PROCESSING) {
|
|
|
|
ASSERT(ERB != NULL);
|
|
|
|
IrpSp = IoGetCurrentIrpStackLocation(ERB);
|
|
|
|
Status = TCPPrepareIrpForCancel(
|
|
(PTCP_CONTEXT) IrpSp->FileObject->FsContext, ERB,
|
|
TCPCancelRequest);
|
|
|
|
if (NT_SUCCESS(Status)) {
|
|
|
|
RequestInformation = (PTDI_REQUEST_KERNEL_RECEIVE)
|
|
&(IrpSp->Parameters);
|
|
|
|
RcvReq->trr_rtn = TCPDataRequestComplete;
|
|
RcvReq->trr_context = ERB;
|
|
RcvReq->trr_buffer = ERB->MdlAddress;
|
|
RcvReq->trr_size = RequestInformation->ReceiveLength;
|
|
RcvReq->trr_uflags = (ushort *)
|
|
&(RequestInformation->ReceiveFlags);
|
|
RcvReq->trr_flags = (uint)(RequestInformation->ReceiveFlags);
|
|
RcvReq->trr_offset = 0;
|
|
RcvReq->trr_amt = 0;
|
|
|
|
KeAcquireSpinLockAtDpcLevel(&RcvTCB->tcb_lock);
|
|
|
|
RcvTCB->tcb_flags &= ~IN_RCV_IND;
|
|
|
|
ASSERT(RcvTCB->tcb_rcvhndlr == IndicateData);
|
|
|
|
// Push him on the front of the rcv. queue.
|
|
ASSERT((RcvTCB->tcb_currcv == NULL) ||
|
|
(RcvTCB->tcb_currcv->trr_amt == 0));
|
|
|
|
if (RcvTCB->tcb_rcvhead == NULL) {
|
|
RcvTCB->tcb_rcvhead = RcvReq;
|
|
RcvTCB->tcb_rcvtail = RcvReq;
|
|
RcvReq->trr_next = NULL;
|
|
} else {
|
|
RcvReq->trr_next = RcvTCB->tcb_rcvhead;
|
|
RcvTCB->tcb_rcvhead = RcvReq;
|
|
}
|
|
|
|
RcvTCB->tcb_currcv = RcvReq;
|
|
RcvTCB->tcb_rcvhndlr = BufferData;
|
|
|
|
ASSERT(BytesTaken <= Size);
|
|
|
|
RcvTCB->tcb_indicated -= BytesTaken;
|
|
if ((Size -= BytesTaken) != 0) {
|
|
//
|
|
// Not everything was taken.
|
|
// Adjust the buffer chain to point beyond what was taken.
|
|
//
|
|
InPacket = TrimPacket(InPacket, BytesTaken);
|
|
|
|
ASSERT(InPacket != NULL);
|
|
|
|
//
|
|
// We've adjusted the buffer chain.
|
|
// Call the BufferData handler.
|
|
//
|
|
BytesTaken += BufferData(RcvTCB, RcvFlags, InPacket, Size);
|
|
|
|
} else {
|
|
// All of the data was taken. Free the buffer chain.
|
|
FreePacketChain(InPacket);
|
|
}
|
|
|
|
return BytesTaken;
|
|
} else {
|
|
//
|
|
// The IRP was cancelled before it was handed back to us.
|
|
// We'll pretend we never saw it. TCPPrepareIrpForCancel
|
|
// already completed it. The client may have taken data,
|
|
// so we will act as if success was returned.
|
|
//
|
|
ERB = NULL;
|
|
Status = TDI_SUCCESS;
|
|
}
|
|
}
|
|
|
|
KeAcquireSpinLockAtDpcLevel(&RcvTCB->tcb_lock);
|
|
|
|
RcvTCB->tcb_flags &= ~IN_RCV_IND;
|
|
|
|
//
|
|
// Status is not more processing. If it's not SUCCESS, the client
|
|
// didn't take any of the data. In either case we now need to
|
|
// see if all of the data was taken. If it wasn't, we'll try and
|
|
// push it onto the front of the pending queue.
|
|
//
|
|
FreeRcvReq(RcvReq); // This won't be needed.
|
|
if (Status == TDI_NOT_ACCEPTED)
|
|
BytesTaken = 0;
|
|
|
|
ASSERT(BytesTaken <= Size);
|
|
|
|
RcvTCB->tcb_indicated -= BytesTaken;
|
|
|
|
ASSERT(RcvTCB->tcb_rcvhndlr == IndicateData);
|
|
|
|
// Check to see if a rcv. buffer got posted during the indication.
|
|
// If it did, reset the receive handler now.
|
|
if (RcvTCB->tcb_rcvhead != NULL)
|
|
RcvTCB->tcb_rcvhndlr = BufferData;
|
|
|
|
// See if all of the data was taken.
|
|
if (BytesTaken == Size) {
|
|
ASSERT(RcvTCB->tcb_indicated == 0);
|
|
|
|
FreePacketChain(InPacket);
|
|
return BytesTaken; // It was all taken.
|
|
}
|
|
|
|
//
|
|
// It wasn't all taken. Adjust for what was taken, and push
|
|
// on the front of the pending queue. We also need to check to
|
|
// see if a receive buffer got posted during the indication. This
|
|
// would be weird, but not impossible.
|
|
//
|
|
InPacket = TrimPacket(InPacket, BytesTaken);
|
|
if (RcvTCB->tcb_rcvhead == NULL) {
|
|
IPv6Packet *LastPkt, *NewPkt;
|
|
|
|
RcvTCB->tcb_rcvhndlr = PendData;
|
|
NewPkt = CovetPacketChain(InPacket, &LastPkt, Size - BytesTaken);
|
|
if (NewPkt != NULL) {
|
|
// We have a duplicate chain. Push it on the front of the
|
|
// pending q.
|
|
if (RcvTCB->tcb_pendhead == NULL) {
|
|
RcvTCB->tcb_pendhead = NewPkt;
|
|
RcvTCB->tcb_pendtail = LastPkt;
|
|
} else {
|
|
LastPkt->Next = RcvTCB->tcb_pendhead;
|
|
RcvTCB->tcb_pendhead = NewPkt;
|
|
}
|
|
RcvTCB->tcb_pendingcnt += Size - BytesTaken;
|
|
BytesTaken = Size;
|
|
} else {
|
|
FreePacketChain(InPacket);
|
|
}
|
|
return BytesTaken;
|
|
} else {
|
|
//
|
|
// Just great. There's now a receive buffer on the TCB.
|
|
// Call the BufferData handler now.
|
|
//
|
|
ASSERT(RcvTCB->tcb_rcvhndlr = BufferData);
|
|
|
|
BytesTaken += BufferData(RcvTCB, RcvFlags, InPacket,
|
|
Size - BytesTaken);
|
|
return BytesTaken;
|
|
}
|
|
|
|
} else {
|
|
//
|
|
// Couldn't get a receive request. We must be really low on resources,
|
|
// so just bail out now.
|
|
//
|
|
FreePacketChain(InPacket);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
|
|
//* IndicatePendingData - Indicate pending data to a client.
|
|
//
|
|
// Called when we need to indicate pending data to an upper layer client,
|
|
// usually because data arrived when we were in a state that it couldn't
|
|
// be indicated.
|
|
//
|
|
// Many of the comments in the BufferData header about the consistency of
|
|
// tcb_pendingcnt apply here also.
|
|
//
|
|
void // Returns: Nothing.
|
|
IndicatePendingData(
|
|
TCB *RcvTCB, // TCB on which to indicate the data.
|
|
TCPRcvReq *RcvReq, // Receive request to use to indicate it.
|
|
KIRQL PreLockIrql) // IRQL prior to acquiring TCB lock.
|
|
{
|
|
TDI_STATUS Status;
|
|
PRcvEvent Event;
|
|
PVOID EventContext, ConnContext;
|
|
uint BytesTaken = 0;
|
|
EventRcvBuffer *ERB = NULL;
|
|
PTDI_REQUEST_KERNEL_RECEIVE RequestInformation;
|
|
PIO_STACK_LOCATION IrpSp;
|
|
IPv6Packet *NewPkt;
|
|
uint Size;
|
|
uint BytesIndicated;
|
|
uint BytesAvailable;
|
|
uchar* DataBuffer;
|
|
|
|
CHECK_STRUCT(RcvTCB, tcb);
|
|
|
|
ASSERT(RcvTCB->tcb_refcnt != 0);
|
|
ASSERT(RcvTCB->tcb_rcvind != NULL);
|
|
ASSERT(RcvTCB->tcb_rcvhead == NULL);
|
|
ASSERT(RcvTCB->tcb_pendingcnt != 0);
|
|
ASSERT(RcvReq != NULL);
|
|
|
|
for (;;) {
|
|
ASSERT(RcvTCB->tcb_rcvhndlr == PendData);
|
|
|
|
// The indicate handler is saved in the TCB. Just call up into it.
|
|
Event = RcvTCB->tcb_rcvind;
|
|
EventContext = RcvTCB->tcb_ricontext;
|
|
ConnContext = RcvTCB->tcb_conncontext;
|
|
BytesIndicated = RcvTCB->tcb_pendhead->ContigSize;
|
|
BytesAvailable = RcvTCB->tcb_pendingcnt;
|
|
DataBuffer = RcvTCB->tcb_pendhead->Data;
|
|
RcvTCB->tcb_indicated = RcvTCB->tcb_pendingcnt;
|
|
RcvTCB->tcb_flags |= IN_RCV_IND;
|
|
|
|
KeReleaseSpinLock(&RcvTCB->tcb_lock, PreLockIrql);
|
|
|
|
IF_TCPDBG(TCPDebug & TCP_DEBUG_RECEIVE) {
|
|
KdPrintEx((DPFLTR_TCPIP6_ID, DPFLTR_INFO_TCPDBG,
|
|
"Indicating pending %d bytes, %d available\n",
|
|
BytesIndicated,
|
|
BytesAvailable));
|
|
}
|
|
|
|
Status = (*Event)(EventContext, ConnContext,
|
|
TDI_RECEIVE_COPY_LOOKAHEAD | TDI_RECEIVE_NORMAL |
|
|
TDI_RECEIVE_ENTIRE_MESSAGE,
|
|
BytesIndicated, BytesAvailable, &BytesTaken,
|
|
DataBuffer, &ERB);
|
|
|
|
IF_TCPDBG(TCPDebug & TCP_DEBUG_RECEIVE) {
|
|
KdPrintEx((DPFLTR_TCPIP6_ID, DPFLTR_INFO_TCPDBG,
|
|
"%d bytes taken\n", BytesTaken));
|
|
}
|
|
|
|
//
|
|
// See what the client did. If the return status is MORE_PROCESSING,
|
|
// we've been given a buffer. In that case put it on the front of the
|
|
// buffer queue, and if all the data wasn't taken go ahead and copy
|
|
// it into the new buffer chain.
|
|
//
|
|
if (Status == TDI_MORE_PROCESSING) {
|
|
|
|
IF_TCPDBG(TCP_DEBUG_RECEIVE) {
|
|
KdPrintEx((DPFLTR_TCPIP6_ID, DPFLTR_INFO_TCPDBG,
|
|
"more processing on receive\n"));
|
|
}
|
|
|
|
ASSERT(ERB != NULL);
|
|
|
|
IrpSp = IoGetCurrentIrpStackLocation(ERB);
|
|
|
|
Status = TCPPrepareIrpForCancel(
|
|
(PTCP_CONTEXT) IrpSp->FileObject->FsContext, ERB,
|
|
TCPCancelRequest);
|
|
|
|
if (NT_SUCCESS(Status)) {
|
|
|
|
RequestInformation = (PTDI_REQUEST_KERNEL_RECEIVE)
|
|
&(IrpSp->Parameters);
|
|
|
|
RcvReq->trr_rtn = TCPDataRequestComplete;
|
|
RcvReq->trr_context = ERB;
|
|
RcvReq->trr_buffer = ERB->MdlAddress;
|
|
RcvReq->trr_size = RequestInformation->ReceiveLength;
|
|
RcvReq->trr_uflags = (ushort *)
|
|
&(RequestInformation->ReceiveFlags);
|
|
RcvReq->trr_flags = (uint)(RequestInformation->ReceiveFlags);
|
|
RcvReq->trr_offset = 0;
|
|
RcvReq->trr_amt = 0;
|
|
|
|
KeAcquireSpinLock(&RcvTCB->tcb_lock, &PreLockIrql);
|
|
RcvTCB->tcb_flags &= ~IN_RCV_IND;
|
|
|
|
// Push him on the front of the receive queue.
|
|
ASSERT((RcvTCB->tcb_currcv == NULL) ||
|
|
(RcvTCB->tcb_currcv->trr_amt == 0));
|
|
|
|
if (RcvTCB->tcb_rcvhead == NULL) {
|
|
RcvTCB->tcb_rcvhead = RcvReq;
|
|
RcvTCB->tcb_rcvtail = RcvReq;
|
|
RcvReq->trr_next = NULL;
|
|
} else {
|
|
RcvReq->trr_next = RcvTCB->tcb_rcvhead;
|
|
RcvTCB->tcb_rcvhead = RcvReq;
|
|
}
|
|
|
|
RcvTCB->tcb_currcv = RcvReq;
|
|
RcvTCB->tcb_rcvhndlr = BufferData;
|
|
|
|
//
|
|
// Have to pick up the new size and pointers now, since things
|
|
// could have changed during the upcall.
|
|
//
|
|
Size = RcvTCB->tcb_pendingcnt;
|
|
NewPkt = RcvTCB->tcb_pendhead;
|
|
RcvTCB->tcb_pendingcnt = 0;
|
|
RcvTCB->tcb_pendhead = NULL;
|
|
|
|
ASSERT(BytesTaken <= Size);
|
|
|
|
RcvTCB->tcb_indicated -= BytesTaken;
|
|
if ((Size -= BytesTaken) != 0) {
|
|
//
|
|
// Not everything was taken. Adjust the buffer chain to
|
|
// point beyond what was taken.
|
|
//
|
|
NewPkt = TrimPacket(NewPkt, BytesTaken);
|
|
|
|
ASSERT(NewPkt != NULL);
|
|
|
|
//
|
|
// We've adjusted the buffer chain.
|
|
// Call the BufferData handler.
|
|
//
|
|
(void)BufferData(RcvTCB, TCP_FLAG_PUSH, NewPkt, Size);
|
|
KeReleaseSpinLock(&RcvTCB->tcb_lock, PreLockIrql);
|
|
|
|
} else {
|
|
//
|
|
// All of the data was taken. Free the buffer chain.
|
|
// Since we were passed a buffer chain which we put on the
|
|
// head of the list, leave the rcvhandler pointing at
|
|
// BufferData.
|
|
//
|
|
ASSERT(RcvTCB->tcb_rcvhndlr == BufferData);
|
|
ASSERT(RcvTCB->tcb_indicated == 0);
|
|
ASSERT(RcvTCB->tcb_rcvhead != NULL);
|
|
|
|
KeReleaseSpinLock(&RcvTCB->tcb_lock, PreLockIrql);
|
|
FreePacketChain(NewPkt);
|
|
}
|
|
|
|
return;
|
|
} else {
|
|
//
|
|
// The IRP was cancelled before it was handed back to us.
|
|
// We'll pretend we never saw it. TCPPrepareIrpForCancel
|
|
// already completed it. The client may have taken data,
|
|
// so we will act as if success was returned.
|
|
//
|
|
ERB = NULL;
|
|
Status = TDI_SUCCESS;
|
|
}
|
|
}
|
|
|
|
KeAcquireSpinLock(&RcvTCB->tcb_lock, &PreLockIrql);
|
|
|
|
RcvTCB->tcb_flags &= ~IN_RCV_IND;
|
|
|
|
//
|
|
// Status is not more processing. If it's not SUCCESS, the client
|
|
// didn't take any of the data. In either case we now need to
|
|
// see if all of the data was taken. If it wasn't, we're done.
|
|
//
|
|
if (Status == TDI_NOT_ACCEPTED)
|
|
BytesTaken = 0;
|
|
|
|
ASSERT(RcvTCB->tcb_rcvhndlr == PendData);
|
|
|
|
RcvTCB->tcb_indicated -= BytesTaken;
|
|
Size = RcvTCB->tcb_pendingcnt;
|
|
NewPkt = RcvTCB->tcb_pendhead;
|
|
|
|
ASSERT(BytesTaken <= Size);
|
|
|
|
// See if all of the data was taken.
|
|
if (BytesTaken == Size) {
|
|
// It was all taken. Zap the pending data information.
|
|
RcvTCB->tcb_pendingcnt = 0;
|
|
RcvTCB->tcb_pendhead = NULL;
|
|
|
|
ASSERT(RcvTCB->tcb_indicated == 0);
|
|
if (RcvTCB->tcb_rcvhead == NULL) {
|
|
if (RcvTCB->tcb_rcvind != NULL)
|
|
RcvTCB->tcb_rcvhndlr = IndicateData;
|
|
} else
|
|
RcvTCB->tcb_rcvhndlr = BufferData;
|
|
|
|
KeReleaseSpinLock(&RcvTCB->tcb_lock, PreLockIrql);
|
|
FreePacketChain(NewPkt);
|
|
break;
|
|
}
|
|
|
|
//
|
|
// It wasn't all taken. Adjust for what was taken; we also need to
|
|
// check to see if a receive buffer got posted during the indication.
|
|
// This would be weird, but not impossible.
|
|
//
|
|
NewPkt = TrimPacket(NewPkt, BytesTaken);
|
|
|
|
ASSERT(RcvTCB->tcb_rcvhndlr == PendData);
|
|
|
|
if (RcvTCB->tcb_rcvhead == NULL) {
|
|
RcvTCB->tcb_pendhead = NewPkt;
|
|
RcvTCB->tcb_pendingcnt -= BytesTaken;
|
|
if (RcvTCB->tcb_indicated != 0 || RcvTCB->tcb_rcvind == NULL) {
|
|
KeReleaseSpinLock(&RcvTCB->tcb_lock, PreLockIrql);
|
|
break;
|
|
}
|
|
|
|
// From here, we'll loop around and indicate the new data that
|
|
// presumably came in during the previous indication.
|
|
} else {
|
|
//
|
|
// Just great. There's now a receive buffer on the TCB.
|
|
// Call the BufferData handler now.
|
|
//
|
|
RcvTCB->tcb_rcvhndlr = BufferData;
|
|
RcvTCB->tcb_pendingcnt = 0;
|
|
RcvTCB->tcb_pendhead = NULL;
|
|
BytesTaken += BufferData(RcvTCB, TCP_FLAG_PUSH, NewPkt,
|
|
Size - BytesTaken);
|
|
KeReleaseSpinLock(&RcvTCB->tcb_lock, PreLockIrql);
|
|
break;
|
|
}
|
|
|
|
} // for (;;)
|
|
|
|
FreeRcvReq(RcvReq); // This isn't needed anymore.
|
|
}
|
|
|
|
//* DeliverUrgent - Deliver urgent data to a client.
|
|
//
|
|
// Called to deliver urgent data to a client. We assume the input
|
|
// urgent data is in a buffer we can keep. The buffer can be NULL, in
|
|
// which case we'll just look on the urgent pending queue for data.
|
|
//
|
|
void // Returns: Nothing.
|
|
DeliverUrgent(
|
|
TCB *RcvTCB, // TCB to deliver on.
|
|
IPv6Packet *RcvPkt, // Packet for urgent data.
|
|
uint Size, // Number of bytes of urgent data to deliver.
|
|
KIRQL *pTCBIrql) // Location of KIRQL prior to acquiring TCB lock.
|
|
{
|
|
KIRQL Irql1, Irql2, Irql3; // One per lock nesting level.
|
|
TCPRcvReq *RcvReq, *PrevReq;
|
|
uint BytesTaken = 0;
|
|
IPv6Packet *LastPkt;
|
|
EventRcvBuffer *ERB;
|
|
PRcvEvent ExpRcv;
|
|
PVOID ExpRcvContext;
|
|
PVOID ConnContext;
|
|
TDI_STATUS Status;
|
|
|
|
CHECK_STRUCT(RcvTCB, tcb);
|
|
ASSERT(RcvTCB->tcb_refcnt != 0);
|
|
|
|
CheckPacketList(RcvTCB->tcb_urgpending, RcvTCB->tcb_urgcnt);
|
|
|
|
//
|
|
// See if we have new data, or are processing old data.
|
|
//
|
|
if (RcvPkt != NULL) {
|
|
//
|
|
// We have new data. If the pending queue is not NULL, or we're
|
|
// already in this routine, just put the buffer on the end of the
|
|
// queue.
|
|
//
|
|
if (RcvTCB->tcb_urgpending != NULL ||
|
|
(RcvTCB->tcb_flags & IN_DELIV_URG)) {
|
|
IPv6Packet *PrevRcvPkt;
|
|
|
|
// Put him on the end of the queue.
|
|
PrevRcvPkt = CONTAINING_RECORD(&RcvTCB->tcb_urgpending, IPv6Packet,
|
|
Next);
|
|
while (PrevRcvPkt->Next != NULL)
|
|
PrevRcvPkt = PrevRcvPkt->Next;
|
|
|
|
PrevRcvPkt->Next = RcvPkt;
|
|
return;
|
|
}
|
|
} else {
|
|
//
|
|
// The input buffer is NULL. See if we have existing data, or are in
|
|
// this routine. If we have no existing data or are in this routine
|
|
// just return.
|
|
//
|
|
if (RcvTCB->tcb_urgpending == NULL ||
|
|
(RcvTCB->tcb_flags & IN_DELIV_URG)) {
|
|
return;
|
|
} else {
|
|
RcvPkt = RcvTCB->tcb_urgpending;
|
|
Size = RcvTCB->tcb_urgcnt;
|
|
RcvTCB->tcb_urgpending = NULL;
|
|
RcvTCB->tcb_urgcnt = 0;
|
|
}
|
|
}
|
|
|
|
ASSERT(RcvPkt != NULL);
|
|
ASSERT(!(RcvTCB->tcb_flags & IN_DELIV_URG));
|
|
|
|
//
|
|
// We know we have data to deliver, and we have a pointer and a size.
|
|
// Go into a loop, trying to deliver the data. On each iteration, we'll
|
|
// try to find a buffer for the data. If we find one, we'll copy and
|
|
// complete it right away. Otherwise we'll try and indicate it. If we
|
|
// can't indicate it, we'll put it on the pending queue and leave.
|
|
//
|
|
RcvTCB->tcb_flags |= IN_DELIV_URG;
|
|
RcvTCB->tcb_slowcount++;
|
|
RcvTCB->tcb_fastchk |= TCP_FLAG_SLOW;
|
|
CheckTCBRcv(RcvTCB);
|
|
|
|
do {
|
|
CheckPacketList(RcvTCB->tcb_urgpending, RcvTCB->tcb_urgcnt);
|
|
|
|
BytesTaken = 0;
|
|
|
|
// First check the expedited queue.
|
|
if ((RcvReq = RcvTCB->tcb_exprcv) != NULL)
|
|
RcvTCB->tcb_exprcv = RcvReq->trr_next;
|
|
else {
|
|
//
|
|
// Nothing in the expedited receive queue. Walk down the ordinary
|
|
// receive queue, looking for a buffer that we can steal.
|
|
//
|
|
PrevReq = CONTAINING_RECORD(&RcvTCB->tcb_rcvhead, TCPRcvReq,
|
|
trr_next);
|
|
RcvReq = PrevReq->trr_next;
|
|
while (RcvReq != NULL) {
|
|
CHECK_STRUCT(RcvReq, trr);
|
|
if (RcvReq->trr_flags & TDI_RECEIVE_EXPEDITED) {
|
|
// This is a candidate.
|
|
if (RcvReq->trr_amt == 0) {
|
|
|
|
ASSERT(RcvTCB->tcb_rcvhndlr == BufferData);
|
|
|
|
//
|
|
// And he has nothing currently in him.
|
|
// Pull him out of the queue.
|
|
//
|
|
if (RcvTCB->tcb_rcvtail == RcvReq) {
|
|
if (RcvTCB->tcb_rcvhead == RcvReq)
|
|
RcvTCB->tcb_rcvtail = NULL;
|
|
else
|
|
RcvTCB->tcb_rcvtail = PrevReq;
|
|
}
|
|
|
|
PrevReq->trr_next = RcvReq->trr_next;
|
|
if (RcvTCB->tcb_currcv == RcvReq) {
|
|
RcvTCB->tcb_currcv = RcvReq->trr_next;
|
|
if (RcvTCB->tcb_currcv == NULL) {
|
|
//
|
|
// We've taken the last receive from the list.
|
|
// Reset the rcvhndlr.
|
|
//
|
|
if (RcvTCB->tcb_rcvind != NULL &&
|
|
RcvTCB->tcb_indicated == 0)
|
|
RcvTCB->tcb_rcvhndlr = IndicateData;
|
|
else
|
|
RcvTCB->tcb_rcvhndlr = PendData;
|
|
}
|
|
}
|
|
|
|
break;
|
|
}
|
|
}
|
|
PrevReq = RcvReq;
|
|
RcvReq = PrevReq->trr_next;
|
|
}
|
|
}
|
|
|
|
//
|
|
// We've done our best to get a buffer. If we got one, copy into it
|
|
// now, and complete the request.
|
|
//
|
|
if (RcvReq != NULL) {
|
|
// Got a buffer.
|
|
KeReleaseSpinLock(&RcvTCB->tcb_lock, *pTCBIrql);
|
|
BytesTaken = CopyPacketToNdis(RcvReq->trr_buffer, RcvPkt,
|
|
Size, 0, RcvPkt->Position);
|
|
(*RcvReq->trr_rtn)(RcvReq->trr_context, TDI_SUCCESS, BytesTaken);
|
|
FreeRcvReq(RcvReq);
|
|
KeAcquireSpinLock(&RcvTCB->tcb_lock, pTCBIrql);
|
|
RcvTCB->tcb_urgind -= MIN(RcvTCB->tcb_urgind, BytesTaken);
|
|
} else {
|
|
// No posted buffer. If we can indicate, do so.
|
|
if (RcvTCB->tcb_urgind == 0) {
|
|
TCPConn *Conn;
|
|
|
|
// See if he has an expedited rcv handler.
|
|
ConnContext = RcvTCB->tcb_conncontext;
|
|
KeReleaseSpinLock(&RcvTCB->tcb_lock, *pTCBIrql);
|
|
KeAcquireSpinLock(&AddrObjTableLock, &Irql1);
|
|
KeAcquireSpinLock(
|
|
&ConnTable[CONN_BLOCKID(RcvTCB->tcb_connid)]->cb_lock,
|
|
&Irql2);
|
|
KeAcquireSpinLock(&RcvTCB->tcb_lock, pTCBIrql);
|
|
if ((Conn = RcvTCB->tcb_conn) != NULL) {
|
|
CHECK_STRUCT(Conn, tc);
|
|
ASSERT(Conn->tc_tcb == RcvTCB);
|
|
KeReleaseSpinLock(&RcvTCB->tcb_lock, *pTCBIrql);
|
|
if (Conn->tc_ao != NULL) {
|
|
AddrObj *AO;
|
|
|
|
AO = Conn->tc_ao;
|
|
KeAcquireSpinLock(&AO->ao_lock, &Irql3);
|
|
if (AO_VALID(AO) && (ExpRcv = AO->ao_exprcv) != NULL) {
|
|
ExpRcvContext = AO->ao_exprcvcontext;
|
|
KeReleaseSpinLock(&AO->ao_lock, Irql3);
|
|
|
|
// We're going to indicate.
|
|
RcvTCB->tcb_urgind = Size;
|
|
KeReleaseSpinLock(&Conn->tc_ConnBlock->cb_lock,
|
|
Irql2);
|
|
KeReleaseSpinLock(&AddrObjTableLock, Irql1);
|
|
|
|
Status = (*ExpRcv)(ExpRcvContext, ConnContext,
|
|
TDI_RECEIVE_COPY_LOOKAHEAD |
|
|
TDI_RECEIVE_ENTIRE_MESSAGE |
|
|
TDI_RECEIVE_EXPEDITED,
|
|
MIN(RcvPkt->ContigSize, Size),
|
|
Size, &BytesTaken, RcvPkt->Data,
|
|
&ERB);
|
|
|
|
KeAcquireSpinLock(&RcvTCB->tcb_lock, pTCBIrql);
|
|
|
|
// See what he did with it.
|
|
if (Status == TDI_MORE_PROCESSING) {
|
|
uint CopySize;
|
|
|
|
// He gave us a buffer.
|
|
if (BytesTaken == Size) {
|
|
//
|
|
// He gave us a buffer, but took all of
|
|
// it. We'll just return it to him.
|
|
//
|
|
CopySize = 0;
|
|
} else {
|
|
// We have some data to copy in.
|
|
RcvPkt = TrimPacket(RcvPkt, BytesTaken);
|
|
ASSERT(RcvPkt->TotalSize != 0);
|
|
CopySize = CopyPacketToNdis(
|
|
ERB->MdlAddress, RcvPkt,
|
|
MIN(Size - BytesTaken,
|
|
TCPGetMdlChainByteCount(
|
|
ERB->MdlAddress)), 0,
|
|
RcvPkt->Position);
|
|
}
|
|
BytesTaken += CopySize;
|
|
RcvTCB->tcb_urgind -= MIN(RcvTCB->tcb_urgind,
|
|
BytesTaken);
|
|
KeReleaseSpinLock(&RcvTCB->tcb_lock,
|
|
*pTCBIrql);
|
|
|
|
ERB->IoStatus.Status = TDI_SUCCESS;
|
|
ERB->IoStatus.Information = CopySize;
|
|
IoCompleteRequest(ERB, 2);
|
|
|
|
KeAcquireSpinLock(&RcvTCB->tcb_lock, pTCBIrql);
|
|
|
|
} else {
|
|
|
|
// No buffer to deal with.
|
|
if (Status == TDI_NOT_ACCEPTED)
|
|
BytesTaken = 0;
|
|
|
|
RcvTCB->tcb_urgind -= MIN(RcvTCB->tcb_urgind,
|
|
BytesTaken);
|
|
}
|
|
goto checksize;
|
|
} else {
|
|
// No receive handler.
|
|
KeReleaseSpinLock(&AO->ao_lock, Irql3);
|
|
}
|
|
}
|
|
// Conn->tc_ao == NULL.
|
|
KeReleaseSpinLock(&Conn->tc_ConnBlock->cb_lock, Irql2);
|
|
KeReleaseSpinLock(&AddrObjTableLock, Irql1);
|
|
KeAcquireSpinLock(&RcvTCB->tcb_lock, pTCBIrql);
|
|
} else {
|
|
// RcvTCB has invalid index.
|
|
KeReleaseSpinLock(
|
|
&ConnTable[CONN_BLOCKID(RcvTCB->tcb_connid)]->cb_lock,
|
|
*pTCBIrql);
|
|
KeReleaseSpinLock(&AddrObjTableLock, Irql2);
|
|
*pTCBIrql = Irql1;
|
|
}
|
|
}
|
|
|
|
//
|
|
// For whatever reason we couldn't indicate the data. At this
|
|
// point we hold the lock on the TCB. Push the buffer onto the
|
|
// pending queue and return.
|
|
//
|
|
CheckPacketList(RcvTCB->tcb_urgpending, RcvTCB->tcb_urgcnt);
|
|
|
|
LastPkt = FindLastPacket(RcvPkt);
|
|
LastPkt->Next = RcvTCB->tcb_urgpending;
|
|
RcvTCB->tcb_urgpending = RcvPkt;
|
|
RcvTCB->tcb_urgcnt += Size;
|
|
break;
|
|
}
|
|
|
|
checksize:
|
|
//
|
|
// See how much we took. If we took it all, check the pending queue.
|
|
// At this point, we should hold the lock on the TCB.
|
|
//
|
|
if (Size == BytesTaken) {
|
|
// Took it all.
|
|
FreePacketChain(RcvPkt);
|
|
RcvPkt = RcvTCB->tcb_urgpending;
|
|
Size = RcvTCB->tcb_urgcnt;
|
|
} else {
|
|
//
|
|
// We didn't manage to take it all. Free what we did take,
|
|
// and then merge with the pending queue.
|
|
//
|
|
RcvPkt = TrimPacket(RcvPkt, BytesTaken);
|
|
Size = Size - BytesTaken + RcvTCB->tcb_urgcnt;
|
|
if (RcvTCB->tcb_urgpending != NULL) {
|
|
//
|
|
// Find the end of the current Packet chain, so we can merge.
|
|
//
|
|
LastPkt = FindLastPacket(RcvPkt);
|
|
LastPkt->Next = RcvTCB->tcb_urgpending;
|
|
}
|
|
}
|
|
|
|
RcvTCB->tcb_urgpending = NULL;
|
|
RcvTCB->tcb_urgcnt = 0;
|
|
|
|
} while (RcvPkt != NULL);
|
|
|
|
CheckPacketList(RcvTCB->tcb_urgpending, RcvTCB->tcb_urgcnt);
|
|
|
|
RcvTCB->tcb_flags &= ~IN_DELIV_URG;
|
|
if (--(RcvTCB->tcb_slowcount) == 0) {
|
|
RcvTCB->tcb_fastchk &= ~TCP_FLAG_SLOW;
|
|
CheckTCBRcv(RcvTCB);
|
|
}
|
|
}
|
|
|
|
//* PushData - Push all data back to the client.
|
|
//
|
|
// Called when we've received a FIN and need to push data to the client.
|
|
//
|
|
void // Returns: Nothing.
|
|
PushData(
|
|
TCB *PushTCB) // TCB to be pushed.
|
|
{
|
|
TCPRcvReq *RcvReq;
|
|
|
|
CHECK_STRUCT(PushTCB, tcb);
|
|
|
|
RcvReq = PushTCB->tcb_rcvhead;
|
|
while (RcvReq != NULL) {
|
|
CHECK_STRUCT(RcvReq, trr);
|
|
RcvReq->trr_flags |= TRR_PUSHED;
|
|
RcvReq = RcvReq->trr_next;
|
|
}
|
|
|
|
RcvReq = PushTCB->tcb_exprcv;
|
|
while (RcvReq != NULL) {
|
|
CHECK_STRUCT(RcvReq, trr);
|
|
RcvReq->trr_flags |= TRR_PUSHED;
|
|
RcvReq = RcvReq->trr_next;
|
|
}
|
|
|
|
if (PushTCB->tcb_rcvhead != NULL || PushTCB->tcb_exprcv != NULL)
|
|
DelayAction(PushTCB, NEED_RCV_CMPLT);
|
|
}
|
|
|
|
//* SplitPacket - Split an IPv6Packet into three pieces.
|
|
//
|
|
// This function takes an input IPv6Packet and splits it into three pieces.
|
|
// The first piece is the input buffer, which we just skip over. The second
|
|
// and third pieces are actually copied, even if we already own them, so
|
|
// that they may go to different places.
|
|
//
|
|
// Note: *SecondBuf and *ThirdBuf are set to NULL if we can't allocate
|
|
// memory for them.
|
|
//
|
|
void // Returns: Nothing.
|
|
SplitPacket(
|
|
IPv6Packet *Packet, // Packet chain to be split.
|
|
uint Size, // Total size in bytes of packet chain.
|
|
uint Offset, // Offset to skip over.
|
|
uint SecondSize, // Size in bytes of second piece.
|
|
IPv6Packet **SecondPkt, // Where to return second packet pointer.
|
|
IPv6Packet **ThirdPkt) // Where to return third packet pointer.
|
|
{
|
|
IPv6Packet *Temp;
|
|
uint ThirdSize;
|
|
|
|
ASSERT(Offset < Size);
|
|
ASSERT(((Offset + SecondSize) < Size) ||
|
|
(((Offset + SecondSize) == Size) && ThirdPkt == NULL));
|
|
ASSERT(Packet != NULL);
|
|
|
|
//
|
|
// Packet points at the packet to copy from, and Offset is the offset into
|
|
// this packet to copy from.
|
|
//
|
|
if (SecondPkt != NULL) {
|
|
//
|
|
// We need to allocate memory for a second packet.
|
|
//
|
|
Temp = ExAllocatePoolWithTagPriority(NonPagedPool,
|
|
sizeof(IPv6Packet) + SecondSize,
|
|
TCP6_TAG, LowPoolPriority);
|
|
if (Temp != NULL) {
|
|
Temp->Next = NULL;
|
|
Temp->Position = 0;
|
|
Temp->FlatData = (uchar *)(Temp + 1);
|
|
Temp->Data = Temp->FlatData;
|
|
Temp->ContigSize = SecondSize;
|
|
Temp->TotalSize = SecondSize;
|
|
Temp->NdisPacket = NULL;
|
|
Temp->AuxList = NULL;
|
|
Temp->Flags = PACKET_OURS;
|
|
CopyPacketToBuffer(Temp->Data, Packet, SecondSize,
|
|
Packet->Position + Offset);
|
|
*SecondPkt = Temp;
|
|
} else {
|
|
*SecondPkt = NULL;
|
|
if (ThirdPkt != NULL)
|
|
*ThirdPkt = NULL;
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (ThirdPkt != NULL) {
|
|
//
|
|
// We need to allocate memory for a third buffer.
|
|
//
|
|
ThirdSize = Size - (Offset + SecondSize);
|
|
Temp = ExAllocatePoolWithTagPriority(NonPagedPool,
|
|
sizeof(IPv6Packet) + ThirdSize,
|
|
TCP6_TAG, LowPoolPriority);
|
|
|
|
if (Temp != NULL) {
|
|
Temp->Next = NULL;
|
|
Temp->Position = 0;
|
|
Temp->FlatData = (uchar *)(Temp + 1);
|
|
Temp->Data = Temp->FlatData;
|
|
Temp->ContigSize = ThirdSize;
|
|
Temp->TotalSize = ThirdSize;
|
|
Temp->NdisPacket = NULL;
|
|
Temp->AuxList = NULL;
|
|
Temp->Flags = PACKET_OURS;
|
|
CopyPacketToBuffer(Temp->Data, Packet, ThirdSize,
|
|
Packet->Position + Offset + SecondSize);
|
|
*ThirdPkt = Temp;
|
|
} else
|
|
*ThirdPkt = NULL;
|
|
}
|
|
}
|
|
|
|
|
|
//* HandleUrgent - Handle urgent data.
|
|
//
|
|
// Called when an incoming segment has urgent data in it. We make sure there
|
|
// really is urgent data in the segment, and if there is we try to dispose
|
|
// of it either by putting it into a posted buffer or calling an exp. rcv.
|
|
// indication handler.
|
|
//
|
|
// This routine is called at DPC level, and with the TCP locked.
|
|
//
|
|
// Urgent data handling is a little complicated. Each TCB has the starting
|
|
// and ending sequence numbers of the 'current' (last received) bit of urgent
|
|
// data. It is possible that the start of the current urgent data might be
|
|
// greater than tcb_rcvnext, if urgent data came in, we handled it, and then
|
|
// couldn't take the preceding normal data. The urgent valid flag is cleared
|
|
// when the next byte of data the user would read (rcvnext - pendingcnt) is
|
|
// greater than the end of urgent data - we do this so that we can correctly
|
|
// support SIOCATMARK. We always seperate urgent data out of the data stream.
|
|
// If the urgent valid field is set when we get into this routing we have
|
|
// to play a couple of games. If the incoming segment starts in front of the
|
|
// current urgent data, we truncate it before the urgent data, and put any
|
|
// data after the urgent data on the reassemble queue. These gyrations are
|
|
// done to avoid delivering the same urgent data twice. If the urgent valid
|
|
// field in the TCB is set and the segment starts after the current urgent
|
|
// data the new urgent information will replace the current urgent
|
|
// information.
|
|
//
|
|
void // Returns: Nothing.
|
|
HandleUrgent(
|
|
TCB *RcvTCB, // TCB to recv the data on.
|
|
TCPRcvInfo *RcvInfo, // RcvInfo structure for the incoming segment.
|
|
IPv6Packet *RcvPkt, // Packet chain containing the incoming segment.
|
|
uint *Size) // Size in bytes of data in the segment.
|
|
{
|
|
uint BytesInFront; // Bytes in front of the urgent data.
|
|
uint BytesInBack; // Bytes in back of the urgent data.
|
|
uint UrgSize; // Size in bytes of urgent data.
|
|
SeqNum UrgStart, UrgEnd;
|
|
IPv6Packet *EndPkt, *UrgPkt;
|
|
TCPRcvInfo NewRcvInfo;
|
|
KIRQL TCBIrql;
|
|
|
|
CHECK_STRUCT(RcvTCB, tcb);
|
|
ASSERT(RcvTCB->tcb_refcnt != 0);
|
|
ASSERT(RcvInfo->tri_flags & TCP_FLAG_URG);
|
|
ASSERT(SEQ_EQ(RcvInfo->tri_seq, RcvTCB->tcb_rcvnext));
|
|
|
|
// First, validate the urgent pointer.
|
|
if (RcvTCB->tcb_flags & BSD_URGENT) {
|
|
//
|
|
// We're using BSD style urgent data. We assume that the urgent
|
|
// data is one byte long, and that the urgent pointer points one
|
|
// after the urgent data instead of at the last byte of urgent data.
|
|
// See if the urgent data is in this segment.
|
|
//
|
|
if (RcvInfo->tri_urgent == 0 || RcvInfo->tri_urgent > *Size) {
|
|
//
|
|
// Not in this segment. Clear the urgent flag and return.
|
|
//
|
|
RcvInfo->tri_flags &= ~TCP_FLAG_URG;
|
|
return;
|
|
}
|
|
|
|
UrgSize = 1;
|
|
BytesInFront = RcvInfo->tri_urgent - 1;
|
|
|
|
} else {
|
|
//
|
|
// This is not BSD style urgent. We assume that the urgent data
|
|
// starts at the front of the segment and the last byte is pointed
|
|
// to by the urgent data pointer.
|
|
//
|
|
BytesInFront = 0;
|
|
UrgSize = MIN(RcvInfo->tri_urgent + 1, *Size);
|
|
}
|
|
|
|
BytesInBack = *Size - BytesInFront - UrgSize;
|
|
|
|
//
|
|
// UrgStart and UrgEnd are the first and last sequence numbers of the
|
|
// urgent data in this segment.
|
|
//
|
|
UrgStart = RcvInfo->tri_seq + BytesInFront;
|
|
UrgEnd = UrgStart + UrgSize - 1;
|
|
|
|
if (!(RcvTCB->tcb_flags & URG_INLINE)) {
|
|
EndPkt = NULL;
|
|
|
|
// Now see if this overlaps with any urgent data we've already seen.
|
|
if (RcvTCB->tcb_flags & URG_VALID) {
|
|
//
|
|
// We have some urgent data still around. See if we've advanced
|
|
// rcvnext beyond the urgent data. If we have, this is new urgent
|
|
// data, and we can go ahead and process it (although anyone doing
|
|
// an SIOCATMARK socket command might get confused). If we haven't
|
|
// consumed the data in front of the existing urgent data yet,
|
|
// we'll truncate this seg. to that amount and push the rest onto
|
|
// the reassembly queue. Note that rcvnext should never fall
|
|
// between tcb_urgstart and tcb_urgend.
|
|
//
|
|
ASSERT(SEQ_LT(RcvTCB->tcb_rcvnext, RcvTCB->tcb_urgstart) ||
|
|
SEQ_GT(RcvTCB->tcb_rcvnext, RcvTCB->tcb_urgend));
|
|
|
|
if (SEQ_LT(RcvTCB->tcb_rcvnext, RcvTCB->tcb_urgstart)) {
|
|
//
|
|
// There appears to be some overlap in the data stream.
|
|
// Split the buffer up into pieces that come before the current
|
|
// urgent data and after the current urgent data, putting the
|
|
// latter on the reassembly queue.
|
|
//
|
|
UrgSize = RcvTCB->tcb_urgend - RcvTCB->tcb_urgstart + 1;
|
|
|
|
BytesInFront = MIN(RcvTCB->tcb_urgstart - RcvTCB->tcb_rcvnext,
|
|
(int) *Size);
|
|
|
|
if (SEQ_GT(RcvTCB->tcb_rcvnext + *Size, RcvTCB->tcb_urgend)) {
|
|
// We have data after this piece of urgent data.
|
|
BytesInBack = RcvTCB->tcb_rcvnext + *Size -
|
|
RcvTCB->tcb_urgend;
|
|
} else
|
|
BytesInBack = 0;
|
|
|
|
SplitPacket(RcvPkt, *Size, BytesInFront, UrgSize, NULL,
|
|
(BytesInBack ? &EndPkt : NULL));
|
|
|
|
if (EndPkt != NULL) {
|
|
NewRcvInfo.tri_seq = RcvTCB->tcb_urgend + 1;
|
|
if (UrgEnd > RcvTCB->tcb_urgend) {
|
|
NewRcvInfo.tri_flags = RcvInfo->tri_flags;
|
|
NewRcvInfo.tri_urgent = UrgEnd - NewRcvInfo.tri_seq;
|
|
if (RcvTCB->tcb_flags & BSD_URGENT)
|
|
NewRcvInfo.tri_urgent++;
|
|
} else {
|
|
NewRcvInfo.tri_flags = RcvInfo->tri_flags &
|
|
~TCP_FLAG_URG;
|
|
}
|
|
NewRcvInfo.tri_ack = RcvInfo->tri_ack;
|
|
NewRcvInfo.tri_window = RcvInfo->tri_window;
|
|
PutOnRAQ(RcvTCB, &NewRcvInfo, EndPkt, BytesInBack);
|
|
FreePacketChain(EndPkt);
|
|
}
|
|
|
|
*Size = BytesInFront;
|
|
RcvInfo->tri_flags &= ~TCP_FLAG_URG;
|
|
return;
|
|
}
|
|
}
|
|
|
|
//
|
|
// We have urgent data we can process now. Split it into its component
|
|
// parts, the first part, the urgent data, and the stuff after the
|
|
// urgent data.
|
|
//
|
|
SplitPacket(RcvPkt, *Size, BytesInFront, UrgSize, &UrgPkt,
|
|
(BytesInBack ? &EndPkt : NULL));
|
|
|
|
//
|
|
// If we managed to split out the end stuff, put it on the queue now.
|
|
//
|
|
if (EndPkt != NULL) {
|
|
NewRcvInfo.tri_seq = RcvInfo->tri_seq + BytesInFront + UrgSize;
|
|
NewRcvInfo.tri_flags = RcvInfo->tri_flags & ~TCP_FLAG_URG;
|
|
NewRcvInfo.tri_ack = RcvInfo->tri_ack;
|
|
NewRcvInfo.tri_window = RcvInfo->tri_window;
|
|
PutOnRAQ(RcvTCB, &NewRcvInfo, EndPkt, BytesInBack);
|
|
FreePacketChain(EndPkt);
|
|
}
|
|
|
|
if (UrgPkt != NULL) {
|
|
// We succesfully split the urgent data out.
|
|
if (!(RcvTCB->tcb_flags & URG_VALID)) {
|
|
RcvTCB->tcb_flags |= URG_VALID;
|
|
RcvTCB->tcb_slowcount++;
|
|
RcvTCB->tcb_fastchk |= TCP_FLAG_SLOW;
|
|
CheckTCBRcv(RcvTCB);
|
|
}
|
|
RcvTCB->tcb_urgstart = UrgStart;
|
|
RcvTCB->tcb_urgend = UrgEnd;
|
|
TCBIrql = DISPATCH_LEVEL;
|
|
DeliverUrgent(RcvTCB, UrgPkt, UrgSize, &TCBIrql);
|
|
}
|
|
|
|
*Size = BytesInFront;
|
|
|
|
} else {
|
|
//
|
|
// Urgent data is to be processed inline. We just need to remember
|
|
// where it is and treat it as normal data. If there's already urgent
|
|
// data, we remember the latest urgent data.
|
|
//
|
|
RcvInfo->tri_flags &= ~TCP_FLAG_URG;
|
|
|
|
if (RcvTCB->tcb_flags & URG_VALID) {
|
|
//
|
|
// There is urgent data. See if this stuff comes after the
|
|
// existing urgent data.
|
|
//
|
|
if (SEQ_LTE(UrgEnd, RcvTCB->tcb_urgend)) {
|
|
//
|
|
// The existing urgent data completely overlaps this stuff,
|
|
// so ignore this.
|
|
//
|
|
return;
|
|
}
|
|
} else {
|
|
RcvTCB->tcb_flags |= URG_VALID;
|
|
RcvTCB->tcb_slowcount++;
|
|
RcvTCB->tcb_fastchk |= TCP_FLAG_SLOW;
|
|
CheckTCBRcv(RcvTCB);
|
|
}
|
|
|
|
RcvTCB->tcb_urgstart = UrgStart;
|
|
RcvTCB->tcb_urgend = UrgEnd;
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
//* TdiReceive - Process a receive request.
|
|
//
|
|
// This is the main TDI receive request handler. We validate the connection
|
|
// and make sure that we have a TCB in the proper state, then we try to
|
|
// allocate a receive request structure. If that succeeds, we'll look and
|
|
// see what's happening on the TCB - if there's pending data, we'll put it
|
|
// in the buffer. Otherwise we'll just queue the receive for later.
|
|
//
|
|
TDI_STATUS // Returns: TDI_STATUS of request.
|
|
TdiReceive(
|
|
PTDI_REQUEST Request, // TDI_REQUEST structure for this request.
|
|
ushort *Flags, // Pointer to flags word.
|
|
uint *RcvLength, // Pointer to length in bytes of receive buffer.
|
|
PNDIS_BUFFER Buffer) // Pointer to buffer to take data.
|
|
{
|
|
TCPConn *Conn;
|
|
TCB *RcvTCB;
|
|
TCPRcvReq *RcvReq;
|
|
KIRQL Irql0, Irql1; // One per lock nesting level.
|
|
TDI_STATUS Error;
|
|
ushort UFlags;
|
|
|
|
Conn = GetConnFromConnID(PtrToUlong(Request->Handle.ConnectionContext),
|
|
&Irql0);
|
|
|
|
if (Conn != NULL) {
|
|
CHECK_STRUCT(Conn, tc);
|
|
|
|
RcvTCB = Conn->tc_tcb;
|
|
if (RcvTCB != NULL) {
|
|
CHECK_STRUCT(RcvTCB, tcb);
|
|
KeAcquireSpinLock(&RcvTCB->tcb_lock, &Irql1);
|
|
KeReleaseSpinLock(&Conn->tc_ConnBlock->cb_lock, Irql1);
|
|
UFlags = *Flags;
|
|
|
|
//
|
|
// Verify that the cached RCE is still valid.
|
|
//
|
|
RcvTCB->tcb_rce = ValidateRCE(RcvTCB->tcb_rce);
|
|
ASSERT(RcvTCB->tcb_rce != NULL);
|
|
|
|
//
|
|
// Fail new receive requests for TCBs in an invalid state
|
|
// and for TCBs with a disconnected outgoing interface
|
|
// (except when a loopback route is used).
|
|
//
|
|
if ((DATA_RCV_STATE(RcvTCB->tcb_state) ||
|
|
(RcvTCB->tcb_pendingcnt != 0 && (UFlags & TDI_RECEIVE_NORMAL)) ||
|
|
(RcvTCB->tcb_urgcnt != 0 && (UFlags & TDI_RECEIVE_EXPEDITED)))
|
|
&& !CLOSING(RcvTCB)
|
|
&& !IsDisconnectedAndNotLoopbackRCE(RcvTCB->tcb_rce)) {
|
|
//
|
|
// We have a TCB, and it's valid. Get a receive request now.
|
|
//
|
|
CheckPacketList(RcvTCB->tcb_pendhead, RcvTCB->tcb_pendingcnt);
|
|
|
|
RcvReq = GetRcvReq();
|
|
if (RcvReq != NULL) {
|
|
RcvReq->trr_rtn = Request->RequestNotifyObject;
|
|
RcvReq->trr_context = Request->RequestContext;
|
|
RcvReq->trr_buffer = Buffer;
|
|
RcvReq->trr_size = *RcvLength;
|
|
RcvReq->trr_uflags = Flags;
|
|
RcvReq->trr_offset = 0;
|
|
RcvReq->trr_amt = 0;
|
|
RcvReq->trr_flags = (uint)UFlags;
|
|
if ((UFlags & (TDI_RECEIVE_NORMAL | TDI_RECEIVE_EXPEDITED))
|
|
!= TDI_RECEIVE_EXPEDITED) {
|
|
//
|
|
// This is not an expedited only receive.
|
|
// Put it on the normal receive queue.
|
|
//
|
|
RcvReq->trr_next = NULL;
|
|
if (RcvTCB->tcb_rcvhead == NULL) {
|
|
// The receive queue is empty.
|
|
// Put it on the front.
|
|
RcvTCB->tcb_rcvhead = RcvReq;
|
|
RcvTCB->tcb_rcvtail = RcvReq;
|
|
} else {
|
|
RcvTCB->tcb_rcvtail->trr_next = RcvReq;
|
|
RcvTCB->tcb_rcvtail = RcvReq;
|
|
}
|
|
|
|
//
|
|
// If this receive is for zero length, complete this
|
|
// and indicate pending data again, if any.
|
|
//
|
|
if (RcvReq->trr_size == 0) {
|
|
RcvTCB->tcb_refcnt++;
|
|
RcvReq->trr_flags |= TRR_PUSHED;
|
|
KeReleaseSpinLock(&RcvTCB->tcb_lock, Irql0);
|
|
CompleteRcvs(RcvTCB);
|
|
KeAcquireSpinLock(&RcvTCB->tcb_lock, &Irql0);
|
|
DerefTCB(RcvTCB, Irql0);
|
|
return TDI_PENDING;
|
|
}
|
|
|
|
//
|
|
// If this receive can't hold urgent data or there
|
|
// isn't any pending urgent data continue processing.
|
|
//
|
|
if (!(UFlags & TDI_RECEIVE_EXPEDITED) ||
|
|
RcvTCB->tcb_urgcnt == 0) {
|
|
//
|
|
// If tcb_currcv is NULL, there is no currently
|
|
// active receive. In this case, check to see if
|
|
// there is pending data and that we are not
|
|
// currently in a receive indication handler. If
|
|
// both of these are true then deal with the
|
|
// pending data.
|
|
//
|
|
if (RcvTCB->tcb_currcv == NULL) {
|
|
RcvTCB->tcb_currcv = RcvReq;
|
|
// No currently active receive.
|
|
if (!(RcvTCB->tcb_flags & IN_RCV_IND)) {
|
|
// Not in a rcv. indication.
|
|
RcvTCB->tcb_rcvhndlr = BufferData;
|
|
if (RcvTCB->tcb_pendhead == NULL) {
|
|
KeReleaseSpinLock(&RcvTCB->tcb_lock,
|
|
Irql0);
|
|
return TDI_PENDING;
|
|
} else {
|
|
IPv6Packet *PendPacket;
|
|
uint PendSize;
|
|
uint OldRcvWin;
|
|
|
|
// We have pending data to deal with.
|
|
PendPacket = RcvTCB->tcb_pendhead;
|
|
PendSize = RcvTCB->tcb_pendingcnt;
|
|
RcvTCB->tcb_pendhead = NULL;
|
|
RcvTCB->tcb_pendingcnt = 0;
|
|
RcvTCB->tcb_refcnt++;
|
|
|
|
//
|
|
// We assume that BufferData holds
|
|
// the lock (does not yield) during
|
|
// this call. If this changes for some
|
|
// reason, we'll have to fix the code
|
|
// below that does the window update
|
|
// check. See the comments in the
|
|
// BufferData() routine for more info.
|
|
//
|
|
(void)BufferData(RcvTCB, TCP_FLAG_PUSH,
|
|
PendPacket, PendSize);
|
|
CheckTCBRcv(RcvTCB);
|
|
//
|
|
// Now we need to see if the window
|
|
// has changed. If it has, send an
|
|
// ACK.
|
|
//
|
|
OldRcvWin = RcvTCB->tcb_rcvwin;
|
|
if (OldRcvWin != RcvWin(RcvTCB)) {
|
|
// The window has changed, so send
|
|
// an ACK.
|
|
DelayAction(RcvTCB, NEED_ACK);
|
|
}
|
|
|
|
DerefTCB(RcvTCB, Irql0);
|
|
ProcessTCBDelayQ();
|
|
return TDI_PENDING;
|
|
}
|
|
}
|
|
//
|
|
// In a receive indication. The receive request
|
|
// is now on the queue, so just fall through
|
|
// to the return.
|
|
//
|
|
}
|
|
//
|
|
// A receive is currently active. No need to do
|
|
// anything else.
|
|
//
|
|
KeReleaseSpinLock(&RcvTCB->tcb_lock, Irql0);
|
|
return TDI_PENDING;
|
|
} else {
|
|
//
|
|
// This buffer can hold urgent data and we have
|
|
// some pending. Deliver it now.
|
|
//
|
|
RcvTCB->tcb_refcnt++;
|
|
DeliverUrgent(RcvTCB, NULL, 0, &Irql0);
|
|
DerefTCB(RcvTCB, Irql0);
|
|
return TDI_PENDING;
|
|
}
|
|
} else {
|
|
TCPRcvReq *Temp;
|
|
|
|
//
|
|
// This is an expedited only receive. Just put it
|
|
// on the end of the expedited receive queue.
|
|
//
|
|
Temp = CONTAINING_RECORD(&RcvTCB->tcb_exprcv,
|
|
TCPRcvReq, trr_next);
|
|
while (Temp->trr_next != NULL)
|
|
Temp = Temp->trr_next;
|
|
|
|
RcvReq->trr_next = NULL;
|
|
Temp->trr_next = RcvReq;
|
|
if (RcvTCB->tcb_urgpending != NULL) {
|
|
RcvTCB->tcb_refcnt++;
|
|
DeliverUrgent(RcvTCB, NULL, 0, &Irql0);
|
|
DerefTCB(RcvTCB, Irql0);
|
|
return TDI_PENDING;
|
|
} else
|
|
Error = TDI_PENDING;
|
|
}
|
|
} else {
|
|
// Couldn't get a receive request.
|
|
Error = TDI_NO_RESOURCES;
|
|
}
|
|
} else {
|
|
// The TCB is in an invalid state.
|
|
Error = TDI_INVALID_STATE;
|
|
}
|
|
KeReleaseSpinLock(&RcvTCB->tcb_lock, Irql0);
|
|
return Error;
|
|
} else {
|
|
// No TCB for connection.
|
|
KeReleaseSpinLock(&Conn->tc_ConnBlock->cb_lock, Irql0);
|
|
Error = TDI_INVALID_STATE;
|
|
}
|
|
} else {
|
|
// No connection.
|
|
Error = TDI_INVALID_CONNECTION;
|
|
}
|
|
|
|
return Error;
|
|
}
|