674 lines
21 KiB
C
674 lines
21 KiB
C
/********************************************************************/
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/** Microsoft LAN Manager **/
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/** Copyright(c) Microsoft Corp., 1990-1993 **/
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/********************************************************************/
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/* :ts=4 */
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//** UDP.C - UDP protocol code.
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//
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// This file contains the code for the UDP protocol functions,
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// principally send and receive datagram.
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//
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#include "oscfg.h"
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#include "ndis.h"
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#include "cxport.h"
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#include "ip.h"
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#include "tdi.h"
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#include "tdistat.h"
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#ifdef VXD
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#include "tdivxd.h"
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#endif
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#ifdef NT
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#include "tdint.h"
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#include "tdistat.h"
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#endif
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#include "queue.h"
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#include "addr.h"
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#include "udp.h"
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#include "tlcommon.h"
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#include "info.h"
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#include "tcpcfg.h"
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#include "secfltr.h"
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#ifdef NT
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#ifdef POOL_TAGGING
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#ifdef ExAllocatePool
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#undef ExAllocatePool
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#endif
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#define ExAllocatePool(type, size) ExAllocatePoolWithTag(type, size, 'uPCT')
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#ifndef CTEAllocMem
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#error "CTEAllocMem is not already defined - will override tagging"
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#else
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#undef CTEAllocMem
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#endif
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#define CTEAllocMem(size) ExAllocatePoolWithTag(NonPagedPool, size, 'uPCT')
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#endif // POOL_TAGGING
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#endif // NT
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EXTERNAL_LOCK(AddrObjTableLock)
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void *UDPProtInfo = NULL;
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extern IPInfo LocalNetInfo;
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#ifdef CHICAGO
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extern uchar TransportName[];
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#endif
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#ifdef CHICAGO
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extern int RegisterAddrChangeHndlr(void *Handler, uint Add);
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extern void AddrChange(IPAddr Addr, IPMask Mask, void *Context,
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uint Added);
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#endif
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//** UDPSend - Send a datagram.
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//
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// The real send datagram routine. We assume that the busy bit is
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// set on the input AddrObj, and that the address of the SendReq
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// has been verified.
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//
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// We start by sending the input datagram, and we loop until there's
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// nothing left on the send q.
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//
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// Input: SrcAO - Pointer to AddrObj doing the send.
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// SendReq - Pointer to sendreq describing send.
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//
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// Returns: Nothing
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//
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void
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UDPSend(AddrObj *SrcAO, DGSendReq *SendReq)
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{
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UDPHeader *UH;
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PNDIS_BUFFER UDPBuffer;
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CTELockHandle HeaderHandle, AOHandle;
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RouteCacheEntry *RCE; // RCE used for each send.
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IPAddr SrcAddr; // Source address IP thinks we should
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// use.
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uchar DestType; // Type of destination address.
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ushort UDPXsum; // Checksum of packet.
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ushort SendSize; // Size we're sending.
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IP_STATUS SendStatus; // Status of send attempt.
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ushort MSS;
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uint AddrValid;
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IPOptInfo *OptInfo;
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IPAddr OrigSrc;
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CTEStructAssert(SrcAO, ao);
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CTEAssert(SrcAO->ao_usecnt != 0);
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//* Loop while we have something to send, and can get
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// resources to send.
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for (;;) {
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CTEStructAssert(SendReq, dsr);
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// Make sure we have a UDP header buffer for this send. If we
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// don't, try to get one.
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if ((UDPBuffer = SendReq->dsr_header) == NULL) {
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// Don't have one, so try to get one.
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CTEGetLock(&DGSendReqLock, &HeaderHandle);
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UDPBuffer = GetDGHeader();
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if (UDPBuffer != NULL)
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SendReq->dsr_header = UDPBuffer;
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else {
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// Couldn't get a header buffer. Push the send request
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// back on the queue, and queue the addr object for when
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// we get resources.
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CTEGetLock(&SrcAO->ao_lock, &AOHandle);
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PUSHQ(&SrcAO->ao_sendq, &SendReq->dsr_q);
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PutPendingQ(SrcAO);
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CTEFreeLock(&SrcAO->ao_lock, AOHandle);
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CTEFreeLock(&DGSendReqLock, HeaderHandle);
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return;
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}
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CTEFreeLock(&DGSendReqLock, HeaderHandle);
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}
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// At this point, we have the buffer we need. Call IP to get an
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// RCE (along with the source address if we need it), then compute
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// the checksum and send the data.
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CTEAssert(UDPBuffer != NULL);
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if (!CLASSD_ADDR(SendReq->dsr_addr)) {
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// This isn't a multicast send, so we'll use the ordinary
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// information.
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OrigSrc = SrcAO->ao_addr;
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OptInfo = &SrcAO->ao_opt;
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} else {
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OrigSrc = SrcAO->ao_mcastaddr;
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OptInfo = &SrcAO->ao_mcastopt;
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}
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if (!(SrcAO->ao_flags & AO_DHCP_FLAG)) {
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SrcAddr = (*LocalNetInfo.ipi_openrce)(SendReq->dsr_addr,
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OrigSrc, &RCE, &DestType, &MSS, OptInfo);
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AddrValid = !IP_ADDR_EQUAL(SrcAddr, NULL_IP_ADDR);
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} else {
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// This is a DHCP send. He really wants to send from the
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// NULL IP address.
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SrcAddr = NULL_IP_ADDR;
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RCE = NULL;
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AddrValid = TRUE;
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}
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if (AddrValid) {
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// The OpenRCE worked. Compute the checksum, and send it.
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if (!IP_ADDR_EQUAL(OrigSrc, NULL_IP_ADDR))
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SrcAddr = OrigSrc;
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UH = (UDPHeader *)((uchar *)NdisBufferVirtualAddress(UDPBuffer) +
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LocalNetInfo.ipi_hsize);
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NdisBufferLength(UDPBuffer) = sizeof(UDPHeader);
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NDIS_BUFFER_LINKAGE(UDPBuffer) = SendReq->dsr_buffer;
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UH->uh_src = SrcAO->ao_port;
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UH->uh_dest = SendReq->dsr_port;
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SendSize = SendReq->dsr_size + sizeof(UDPHeader);
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UH->uh_length = net_short(SendSize);
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UH->uh_xsum = 0;
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if (AO_XSUM(SrcAO)) {
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// Compute the header xsum, and then call XsumNdisChain
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UDPXsum = XsumSendChain(PHXSUM(SrcAddr, SendReq->dsr_addr,
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PROTOCOL_UDP, SendSize), UDPBuffer);
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// We need to negate the checksum, unless it's already all
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// ones. In that case negating it would take it to 0, and
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// then we'd have to set it back to all ones.
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if (UDPXsum != 0xffff)
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UDPXsum =~UDPXsum;
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UH->uh_xsum = UDPXsum;
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}
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// We've computed the xsum. Now send the packet.
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UStats.us_outdatagrams++;
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SendStatus = (*LocalNetInfo.ipi_xmit)(UDPProtInfo, SendReq,
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UDPBuffer, (uint)SendSize, SendReq->dsr_addr, SrcAddr,
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OptInfo, RCE, PROTOCOL_UDP);
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(*LocalNetInfo.ipi_closerce)(RCE);
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// If it completed immediately, give it back to the user.
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// Otherwise we'll complete it when the SendComplete happens.
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// Currently, we don't map the error code from this call - we
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// might need to in the future.
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if (SendStatus != IP_PENDING)
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DGSendComplete(SendReq, UDPBuffer);
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} else {
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TDI_STATUS Status;
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if (DestType == DEST_INVALID)
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Status = TDI_BAD_ADDR;
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else
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Status = TDI_DEST_UNREACHABLE;
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// Complete the request with an error.
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(*SendReq->dsr_rtn)(SendReq->dsr_context, Status, 0);
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// Now free the request.
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SendReq->dsr_rtn = NULL;
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DGSendComplete(SendReq, UDPBuffer);
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}
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CTEGetLock(&SrcAO->ao_lock, &AOHandle);
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if (!EMPTYQ(&SrcAO->ao_sendq)) {
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DEQUEUE(&SrcAO->ao_sendq, SendReq, DGSendReq, dsr_q);
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CTEFreeLock(&SrcAO->ao_lock, AOHandle);
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} else {
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CLEAR_AO_REQUEST(SrcAO, AO_SEND);
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CTEFreeLock(&SrcAO->ao_lock, AOHandle);
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return;
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}
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}
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}
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//* UDPDeliver - Deliver a datagram to a user.
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//
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// This routine delivers a datagram to a UDP user. We're called with
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// the AddrObj to deliver on, and with the AddrObjTable lock held.
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// We try to find a receive on the specified AddrObj, and if we do
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// we remove it and copy the data into the buffer. Otherwise we'll
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// call the receive datagram event handler, if there is one. If that
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// fails we'll discard the datagram.
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//
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// Input: RcvAO - AO to receive the datagram.
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// SrcIP - Source IP address of datagram.
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// SrcPort - Source port of datagram.
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// RcvBuf - The IPReceive buffer containing the data.
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// RcvSize - Size received, including the UDP header.
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// TableHandle - Lock handle for AddrObj table.
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//
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// Returns: Nothing.
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//
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void
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UDPDeliver(AddrObj *RcvAO, IPAddr SrcIP, ushort SrcPort, IPRcvBuf *RcvBuf,
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uint RcvSize, IPOptInfo *OptInfo, CTELockHandle TableHandle, uchar IsBCast)
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{
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Queue *CurrentQ;
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CTELockHandle AOHandle;
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DGRcvReq *RcvReq;
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uint BytesTaken = 0;
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uchar AddressBuffer[TCP_TA_SIZE];
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uint RcvdSize;
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EventRcvBuffer *ERB = NULL;
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CTEStructAssert(RcvAO, ao);
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CTEGetLock(&RcvAO->ao_lock, &AOHandle);
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CTEFreeLock(&AddrObjTableLock, AOHandle);
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if (AO_VALID(RcvAO)) {
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CurrentQ = QHEAD(&RcvAO->ao_rcvq);
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// Walk the list, looking for a receive buffer that matches.
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while (CurrentQ != QEND(&RcvAO->ao_rcvq)) {
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RcvReq = QSTRUCT(DGRcvReq, CurrentQ, drr_q);
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CTEStructAssert(RcvReq, drr);
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// If this request is a wildcard request, or matches the source IP
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// address, check the port.
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if (IP_ADDR_EQUAL(RcvReq->drr_addr, NULL_IP_ADDR) ||
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IP_ADDR_EQUAL(RcvReq->drr_addr, SrcIP)) {
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// The local address matches, check the port. We'll match
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// either 0 or the actual port.
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if (RcvReq->drr_port == 0 || RcvReq->drr_port == SrcPort) {
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TDI_STATUS Status;
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// The ports matched. Remove this from the queue.
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REMOVEQ(&RcvReq->drr_q);
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// We're done. We can free the AddrObj lock now.
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CTEFreeLock(&RcvAO->ao_lock, TableHandle);
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// Call CopyRcvToNdis, and then complete the request.
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RcvdSize = CopyRcvToNdis(RcvBuf, RcvReq->drr_buffer,
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RcvReq->drr_size, sizeof(UDPHeader), 0);
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CTEAssert(RcvdSize <= RcvReq->drr_size);
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Status = UpdateConnInfo(RcvReq->drr_conninfo, OptInfo,
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SrcIP, SrcPort);
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UStats.us_indatagrams++;
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(*RcvReq->drr_rtn)(RcvReq->drr_context, Status, RcvdSize);
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FreeDGRcvReq(RcvReq);
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return;
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}
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}
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// Either the IP address or the port didn't match. Get the next
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// one.
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CurrentQ = QNEXT(CurrentQ);
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}
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// We've walked the list, and not found a buffer. Call the recv.
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// handler now.
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if (RcvAO->ao_rcvdg != NULL) {
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PRcvDGEvent RcvEvent = RcvAO->ao_rcvdg;
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PVOID RcvContext = RcvAO->ao_rcvdgcontext;
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TDI_STATUS RcvStatus;
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CTELockHandle OldLevel;
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ULONG Flags = TDI_RECEIVE_COPY_LOOKAHEAD;
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REF_AO(RcvAO);
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CTEFreeLock(&RcvAO->ao_lock, TableHandle);
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BuildTDIAddress(AddressBuffer, SrcIP, SrcPort);
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UStats.us_indatagrams++;
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if (IsBCast) {
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Flags |= TDI_RECEIVE_BROADCAST;
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}
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RcvStatus = (*RcvEvent)(RcvContext, TCP_TA_SIZE,
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(PTRANSPORT_ADDRESS)AddressBuffer, OptInfo->ioi_optlength,
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OptInfo->ioi_options, Flags,
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RcvBuf->ipr_size - sizeof(UDPHeader),
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RcvSize - sizeof(UDPHeader), &BytesTaken,
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RcvBuf->ipr_buffer + sizeof(UDPHeader), &ERB);
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if (RcvStatus == TDI_MORE_PROCESSING) {
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CTEAssert(ERB != NULL);
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// We were passed back a receive buffer. Copy the data in now.
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// He can't have taken more than was in the indicated
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// buffer, but in debug builds we'll check to make sure.
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CTEAssert(BytesTaken <= (RcvBuf->ipr_size - sizeof(UDPHeader)));
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#ifdef VXD
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RcvdSize = CopyRcvToNdis(RcvBuf, ERB->erb_buffer,
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ERB->erb_size, sizeof(UDPHeader) + BytesTaken, 0);
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//
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// Call the completion routine.
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//
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(*ERB->erb_rtn)(ERB->erb_context, TDI_SUCCESS, RcvdSize);
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#endif // VXD
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#ifdef NT
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{
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PIO_STACK_LOCATION IrpSp;
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PTDI_REQUEST_KERNEL_RECEIVEDG DatagramInformation;
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IrpSp = IoGetCurrentIrpStackLocation(ERB);
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DatagramInformation = (PTDI_REQUEST_KERNEL_RECEIVEDG)
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&(IrpSp->Parameters);
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//
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// Copy the remaining data to the IRP.
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//
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RcvdSize = CopyRcvToNdis(RcvBuf, ERB->MdlAddress,
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RcvSize - sizeof(UDPHeader) - BytesTaken,
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sizeof(UDPHeader) + BytesTaken, 0);
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//
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// Update the return address info
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//
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RcvStatus = UpdateConnInfo(
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DatagramInformation->ReturnDatagramInformation,
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OptInfo, SrcIP, SrcPort);
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//
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// Complete the IRP.
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//
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ERB->IoStatus.Information = RcvdSize;
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ERB->IoStatus.Status = RcvStatus;
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IoCompleteRequest(ERB, 2);
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}
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#endif // NT
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}
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else {
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CTEAssert(
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(RcvStatus == TDI_SUCCESS) ||
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(RcvStatus == TDI_NOT_ACCEPTED)
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);
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CTEAssert(ERB == NULL);
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}
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DELAY_DEREF_AO(RcvAO);
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return;
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} else
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UStats.us_inerrors++;
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// When we get here, we didn't have a buffer to put this data into.
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// Fall through to the return case.
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} else
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UStats.us_inerrors++;
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CTEFreeLock(&RcvAO->ao_lock, TableHandle);
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}
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//* UDPRcv - Receive a UDP datagram.
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//
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// The routine called by IP when a UDP datagram arrived. We
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// look up the port/local address pair in our address table,
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// and deliver the data to a user if we find one. For broadcast
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// frames we may deliver it to multiple users.
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//
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// Entry: IPContext - IPContext identifying physical i/f that
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// received the data.
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// Dest - IPAddr of destionation.
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// Src - IPAddr of source.
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// LocalAddr - Local address of network which caused this to be
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// received.
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// SrcAddr - Address of local interface which received the packet
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// IPH - IP Header.
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// IPHLength - Bytes in IPH.
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// RcvBuf - Pointer to receive buffer chain containing data.
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// Size - Size in bytes of data received.
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// IsBCast - Boolean indicator of whether or not this came in as
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// a bcast.
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// Protocol - Protocol this came in on - should be UDP.
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// OptInfo - Pointer to info structure for received options.
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//
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// Returns: Status of reception. Anything other than IP_SUCCESS will cause
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// IP to send a 'port unreachable' message.
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//
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IP_STATUS
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UDPRcv(void *IPContext, IPAddr Dest, IPAddr Src, IPAddr LocalAddr,
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IPAddr SrcAddr, IPHeader UNALIGNED *IPH, uint IPHLength, IPRcvBuf *RcvBuf,
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uint IPSize, uchar IsBCast, uchar Protocol, IPOptInfo *OptInfo)
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{
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UDPHeader UNALIGNED *UH;
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CTELockHandle AOTableHandle;
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AddrObj *ReceiveingAO;
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uint Size;
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uchar DType;
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DType = (*LocalNetInfo.ipi_getaddrtype)(Src);
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// The following code relies on DEST_INVALID being a broadcast dest type.
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// If this is changed the code here needs to change also.
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if (IS_BCAST_DEST(DType)) {
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if (!IP_ADDR_EQUAL(Src, NULL_IP_ADDR) || !IsBCast) {
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UStats.us_inerrors++;
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return IP_SUCCESS; // Bad src address.
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}
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}
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UH = (UDPHeader *)RcvBuf->ipr_buffer;
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Size = (uint)(net_short(UH->uh_length));
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if (Size < sizeof(UDPHeader)) {
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UStats.us_inerrors++;
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return IP_SUCCESS; // Size is too small.
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}
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if (Size != IPSize) {
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// Size doesn't match IP datagram size. If the size is larger
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// than the datagram, throw it away. If it's smaller, truncate the
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// recv. buffer.
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if (Size < IPSize) {
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IPRcvBuf *TempBuf = RcvBuf;
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uint TempSize = Size;
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while (TempBuf != NULL) {
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TempBuf->ipr_size = MIN(TempBuf->ipr_size, TempSize);
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TempSize -= TempBuf->ipr_size;
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TempBuf = TempBuf->ipr_next;
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}
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} else {
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// Size is too big, toss it.
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UStats.us_inerrors++;
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return IP_SUCCESS;
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}
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}
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if (UH->uh_xsum != 0) {
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if (XsumRcvBuf(PHXSUM(Src, Dest, PROTOCOL_UDP, Size), RcvBuf) != 0xffff) {
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UStats.us_inerrors++;
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|
return IP_SUCCESS; // Checksum failed.
|
|
}
|
|
}
|
|
|
|
CTEGetLock(&AddrObjTableLock, &AOTableHandle);
|
|
|
|
#ifdef SECFLTR
|
|
//
|
|
// See if we are filtering the destination interface/port.
|
|
//
|
|
if ( !SecurityFilteringEnabled ||
|
|
IsPermittedSecurityFilter(
|
|
SrcAddr,
|
|
IPContext,
|
|
PROTOCOL_UDP,
|
|
(ulong) net_short(UH->uh_dest)
|
|
)
|
|
)
|
|
{
|
|
#endif // SECFLTR
|
|
|
|
// Try to find an AddrObj to give this to. In the broadcast case, we
|
|
// may have to do this multiple times. If it isn't a broadcast, just
|
|
// get the best match and deliver it to them.
|
|
|
|
if (!IsBCast) {
|
|
ReceiveingAO = GetBestAddrObj(Dest, UH->uh_dest, PROTOCOL_UDP);
|
|
if (ReceiveingAO != NULL) {
|
|
UDPDeliver(ReceiveingAO, Src, UH->uh_src, RcvBuf, Size,
|
|
OptInfo, AOTableHandle, IsBCast);
|
|
return IP_SUCCESS;
|
|
} else {
|
|
CTEFreeLock(&AddrObjTableLock, AOTableHandle);
|
|
UStats.us_noports++;
|
|
return IP_GENERAL_FAILURE;
|
|
}
|
|
} else {
|
|
// This is a broadcast, we'll need to loop.
|
|
|
|
AOSearchContext Search;
|
|
|
|
DType = (*LocalNetInfo.ipi_getaddrtype)(Dest);
|
|
|
|
ReceiveingAO = GetFirstAddrObj(LocalAddr, UH->uh_dest, PROTOCOL_UDP,
|
|
&Search);
|
|
if (ReceiveingAO != NULL) {
|
|
do {
|
|
if ((DType != DEST_MCAST) ||
|
|
((DType == DEST_MCAST) &&
|
|
MCastAddrOnAO(ReceiveingAO, Dest))) {
|
|
UDPDeliver(ReceiveingAO, Src, UH->uh_src, RcvBuf, Size,
|
|
OptInfo, AOTableHandle, IsBCast);
|
|
CTEGetLock(&AddrObjTableLock, &AOTableHandle);
|
|
}
|
|
ReceiveingAO = GetNextAddrObj(&Search);
|
|
} while (ReceiveingAO != NULL);
|
|
} else
|
|
UStats.us_noports++;
|
|
}
|
|
|
|
#ifdef SECFLTR
|
|
}
|
|
#endif // SECFLTR
|
|
|
|
CTEFreeLock(&AddrObjTableLock, AOTableHandle);
|
|
|
|
return IP_SUCCESS;
|
|
}
|
|
|
|
//* UDPStatus - Handle a status indication.
|
|
//
|
|
// This is the UDP status handler, called by IP when a status event
|
|
// occurs. For most of these we do nothing. For certain severe status
|
|
// events we will mark the local address as invalid.
|
|
//
|
|
// Entry: StatusType - Type of status (NET or HW). NET status
|
|
// is usually caused by a received ICMP
|
|
// message. HW status indicate a HW
|
|
// problem.
|
|
// StatusCode - Code identifying IP_STATUS.
|
|
// OrigDest - If this is NET status, the original dest. of
|
|
// DG that triggered it.
|
|
// OrigSrc - " " " " " , the original src.
|
|
// Src - IP address of status originator (could be local
|
|
// or remote).
|
|
// Param - Additional information for status - i.e. the
|
|
// param field of an ICMP message.
|
|
// Data - Data pertaining to status - for NET status, this
|
|
// is the first 8 bytes of the original DG.
|
|
//
|
|
// Returns: Nothing
|
|
//
|
|
void
|
|
UDPStatus(uchar StatusType, IP_STATUS StatusCode, IPAddr OrigDest,
|
|
IPAddr OrigSrc, IPAddr Src, ulong Param, void *Data)
|
|
{
|
|
// If this is a HW status, it could be because we've had an address go
|
|
// away.
|
|
if (StatusType == IP_HW_STATUS) {
|
|
|
|
if (StatusCode == IP_ADDR_DELETED) {
|
|
//
|
|
// An address has gone away. OrigDest identifies the address.
|
|
//
|
|
#ifndef _PNP_POWER
|
|
//
|
|
// This is done via TDI notifications in the PNP world.
|
|
//
|
|
InvalidateAddrs(OrigDest);
|
|
|
|
#endif // _PNP_POWER
|
|
|
|
#ifdef SECFLTR
|
|
//
|
|
// Delete any security filters associated with this address
|
|
//
|
|
DeleteProtocolSecurityFilter(OrigDest, PROTOCOL_UDP);
|
|
|
|
#endif // SECFLTR
|
|
|
|
return;
|
|
}
|
|
|
|
if (StatusCode == IP_ADDR_ADDED) {
|
|
|
|
#ifdef SECFLTR
|
|
//
|
|
// An address has materialized. OrigDest identifies the address.
|
|
// Data is a handle to the IP configuration information for the
|
|
// interface on which the address is instantiated.
|
|
//
|
|
AddProtocolSecurityFilter(OrigDest, PROTOCOL_UDP,
|
|
(NDIS_HANDLE) Data);
|
|
#endif // SECFLTR
|
|
|
|
return;
|
|
}
|
|
|
|
#ifdef CHICAGO
|
|
if (StatusCode == IP_UNLOAD) {
|
|
// IP is telling us we're being unloaded. First, deregister
|
|
// with VTDI, and then call CTEUnload().
|
|
(void)TLRegisterProtocol(PROTOCOL_UDP, NULL, NULL, NULL, NULL);
|
|
|
|
#ifdef UDP_ONLY
|
|
// Only do the following in the UDP_ONLY version. TCP does it in
|
|
// the generic version.
|
|
TLRegisterDispatch(TransportName, NULL);
|
|
(void)RegisterAddrChangeHndlr(AddrChange, FALSE);
|
|
CTEUnload(TransportName);
|
|
#endif // UDP_ONLY
|
|
|
|
return;
|
|
}
|
|
#endif // CHICAGO
|
|
}
|
|
}
|
|
|