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635 lines
15 KiB
635 lines
15 KiB
/*++
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Copyright (c) 1995 Microsoft Corporation
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Module Name:
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ripproc.c
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Abstract:
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RIP processing functions
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Author:
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Stefan Solomon 09/01/1995
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Revision History:
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--*/
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#include "precomp.h"
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#pragma hdrstop
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VOID
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RipRequest(PWORK_ITEM wip);
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VOID
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RipResponse(PWORK_ITEM wip);
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VOID
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StartGenResponse(PICB icbp,
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PUCHAR dstnodep,
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PUCHAR dstsocket);
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ULONG
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RouteTimeToLiveSecs(PICB icbp);
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/*++
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Function: ProcessReceivedPacket
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Descr: increments the receive if statistics
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does rip processing
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Remark: >> called with the if lock held <<
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--*/
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VOID
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ProcessReceivedPacket(PWORK_ITEM wip)
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{
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USHORT opcode;
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PUCHAR hdrp; // ptr to the packet header
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PICB icbp;
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USHORT pktlen;
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icbp = wip->icbp;
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// check that the interface is up
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if(icbp->IfStats.RipIfOperState != OPER_STATE_UP) {
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return;
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}
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// get a ptr to the packet header
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hdrp = wip->Packet;
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// check if this is a looped back packet
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if(!memcmp(hdrp + IPXH_SRCNODE, icbp->AdapterBindingInfo.LocalNode, 6)) {
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return;
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}
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// update the interface receive statistics
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icbp->IfStats.RipIfInputPackets++;
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// check the packet length
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GETSHORT2USHORT(&pktlen, hdrp + IPXH_LENGTH);
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if(pktlen > MAX_PACKET_LEN) {
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// bad length RIP packet
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return;
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}
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// check the RIP operation type
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GETSHORT2USHORT(&opcode, hdrp + RIP_OPCODE);
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switch(opcode) {
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case RIP_REQUEST:
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RipRequest(wip);
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break;
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case RIP_RESPONSE:
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RipResponse(wip);
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break;
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default:
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// this is a bad opcode RIP packet
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break;
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}
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}
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//***
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//
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// Function: RipRequest
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//
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// Descr: process the RIP request
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//
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// Remark: >> called with the if lock held <<
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//
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//***
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VOID
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RipRequest(PWORK_ITEM wip)
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{
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USHORT reqlen; // offset to get next request
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USHORT resplen; // offset to put next response
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USHORT pktlen; // packet length
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PUCHAR hdrp; // ptr to the received packet header
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PUCHAR resphdrp; // ptr to the response packet header
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PICB icbp;
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USHORT srcsocket;
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IPX_ROUTE IpxRoute;
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PWORK_ITEM respwip = NULL; // response packet
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ULONG network;
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icbp = wip->icbp;
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Trace(RIP_REQUEST_TRACE, "RipRequest: Entered on if # %d", icbp->InterfaceIndex);
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if(icbp->IfConfigInfo.Supply != ADMIN_STATE_ENABLED) {
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Trace(RIP_REQUEST_TRACE,
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"RIP request discarded on if %d because Supply is DISABLED\n",
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icbp->InterfaceIndex);
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return;
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}
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// get a ptr to the packet header
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hdrp = wip->Packet;
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// get IPX packet length
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GETSHORT2USHORT(&pktlen, hdrp + IPXH_LENGTH);
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// if the packet is too long, discard
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if(pktlen > MAX_PACKET_LEN) {
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Trace(RIP_REQUEST_TRACE,
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"RIP request discarded on if %d because the packet size %d > max packet len %d\n",
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icbp->InterfaceIndex,
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pktlen,
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MAX_PACKET_LEN);
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return;
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}
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// We may have one or more network entry requests in the packet.
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// If one network entry is 0xFFFFFFFF, then a general RIP response is
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// requested.
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// for each network entry, try to get the answer from our routing table
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for(reqlen = resplen = RIP_INFO;
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(reqlen+NE_ENTRYSIZE) <= pktlen;
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reqlen += NE_ENTRYSIZE) {
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// check if a general response is requested
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if(!memcmp(hdrp + reqlen + NE_NETNUMBER, bcastnet, 4)) {
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//*** a general response is requested ***
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// create the initial general response packet (work item).
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// when the send completes for this packet, the work item will
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// contain the RTM enumeration handle which is used to continue
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// for the creation of the next succesive gen response packets
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StartGenResponse(icbp,
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hdrp + IPXH_SRCNODE,
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hdrp + IPXH_SRCSOCK);
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return;
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}
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//*** a specific response is requested. ***
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// allocate a response packet if none allocated yet
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if(respwip == NULL) {
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if((respwip = AllocateWorkItem(SEND_PACKET_TYPE)) == NULL) {
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// give up!
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Trace(RIP_REQUEST_TRACE,
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"RIP request discarded on if %d because cannot allocate response packet\n",
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icbp->InterfaceIndex);
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return;
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}
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else
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{
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// init the send packet
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respwip->icbp = icbp;
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respwip->AdapterIndex = icbp->AdapterBindingInfo.AdapterIndex;
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resphdrp = respwip->Packet;
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}
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}
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if(IsRoute(hdrp + reqlen + NE_NETNUMBER, &IpxRoute)) {
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// check if we can route the packet
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// the route should be on a different interface index than the
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// received packet. For the global WAN net, the interface index is
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// the GLOBAL_INTERFACE_INDEX
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if(IsRouteAdvertisable(icbp, &IpxRoute)) {
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// we can route it -> answer to it
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// fill in the network entry structure in the packet with the
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// info from the route entry
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SetNetworkEntry(resphdrp + resplen, &IpxRoute, icbp->LinkTickCount);
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// increment the response length to the next response entry
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resplen += NE_ENTRYSIZE;
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}
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}
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else
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{
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GETLONG2ULONG(&network, hdrp + reqlen + NE_NETNUMBER);
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Trace(RIP_REQUEST_TRACE,
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"RIP Request on if %d : Route not found for net %x\n",
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icbp->InterfaceIndex,
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network);
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}
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}
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// We are done answering this request.
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// Check if any response has been generated
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if(resplen == RIP_INFO) {
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// no response generated for this packet
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if(respwip != NULL) {
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FreeWorkItem(respwip);
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}
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return;
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}
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// set the response packet header (src becomes dest)
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SetRipIpxHeader(resphdrp,
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icbp, // sets the src&dst net, src node and src socket
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hdrp + IPXH_SRCNODE,
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hdrp + IPXH_SRCSOCK,
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RIP_RESPONSE);
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// set the new packet length
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PUTUSHORT2SHORT(resphdrp + IPXH_LENGTH, resplen);
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// send the response
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if(SendSubmit(respwip) != NO_ERROR) {
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FreeWorkItem(respwip);
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}
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}
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//***
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//
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// Function: RipResponse
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//
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// Descr: Updates the routing table with the response info
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//
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// Params: Packet
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//
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// Returns: none
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//
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// Remark: >> called with the interface lock held <<
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//
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//***
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VOID
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RipResponse(PWORK_ITEM wip)
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{
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PICB icbp;
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USHORT resplen; // offset of the next response network entry
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USHORT pktlen; // IPX packet length
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PUCHAR hdrp; // ptr to the packet header
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USHORT nrofhops;
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USHORT tickcount;
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IPX_ROUTE IpxRoute;
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ULONG i;
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// get a ptr to this ICB
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icbp = wip->icbp;
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// check if LISTEN TO RIP UPDATES is enabled on this interface
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if(icbp->IfConfigInfo.Listen != ADMIN_STATE_ENABLED) {
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Trace(RIP_RESPONSE_TRACE,
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"RIP Response on if %d : discard response packet because LISTEN is DISABLED\n",
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icbp->InterfaceIndex);
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return;
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}
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// get a ptr to the received response packet header
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hdrp = wip->Packet;
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// get received response packet length
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GETSHORT2USHORT(&pktlen, hdrp + IPXH_LENGTH);
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// check the source address of the sender. If different then what is locally
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// configured log an error.
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if(memcmp(hdrp + IPXH_SRCNET, icbp->AdapterBindingInfo.Network, 4)) {
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Trace(RIP_ALERT,
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"The router at %.2x%.2x%.2x%.2x%.2x%.2x claims the local interface # %d has network number %.2x%.2x%.2x%.2x !\n",
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*(hdrp + IPXH_SRCNODE),
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*(hdrp + IPXH_SRCNODE + 1),
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*(hdrp + IPXH_SRCNODE + 2),
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*(hdrp + IPXH_SRCNODE + 3),
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*(hdrp + IPXH_SRCNODE + 4),
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*(hdrp + IPXH_SRCNODE + 5),
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icbp->InterfaceIndex,
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*(hdrp + IPXH_SRCNET),
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*(hdrp + IPXH_SRCNET + 1),
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*(hdrp + IPXH_SRCNET + 2),
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*(hdrp + IPXH_SRCNET + 3));
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IF_LOG (EVENTLOG_WARNING_TYPE) {
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LPWSTR pname[1] = {icbp->InterfaceName};
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RouterLogWarningDataW (RipEventLogHdl,
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ROUTERLOG_IPXRIP_LOCAL_NET_NUMBER_CONFLICT,
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1, pname,
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10, hdrp+IPXH_SRCNET);
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}
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return;
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}
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// For each network entry:
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// chcek if it passes the acceptance filter and if yes:
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// add it to our routing table if route not down
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// delete it from the routing table if route down
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for(resplen = RIP_INFO, i = 0;
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((resplen+NE_ENTRYSIZE) <= pktlen) && (i < 50);
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resplen += NE_ENTRYSIZE, i++) {
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// check if there is an entry left in the packet
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if(resplen + NE_ENTRYSIZE > pktlen) {
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Trace(RIP_ALERT, "RipResponse: Invalid length for last network entry in the packet, discard entry!\n");
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continue;
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}
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// check if it passes the acceptance filter
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if(!PassRipListenFilter(icbp, hdrp + resplen + NE_NETNUMBER)) {
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Trace(RIP_RESPONSE_TRACE,
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"RIP Response on if %d : do not accept net %.2x%.2x%.2x%.2x because of LISTEN filter\n",
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icbp->InterfaceIndex,
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*(hdrp + IPXH_SRCNET),
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*(hdrp + IPXH_SRCNET + 1),
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*(hdrp + IPXH_SRCNET + 2),
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*(hdrp + IPXH_SRCNET + 3));
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continue;
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}
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// check if the network route is up or down
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GETSHORT2USHORT(&nrofhops, hdrp + resplen + NE_NROFHOPS);
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if(nrofhops < 16) {
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// pmay: U270476. Disregard routes with 0 hop count
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//
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if (nrofhops == 0)
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{
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continue;
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}
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// if there is a bogus network number advertised in this packet
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// like 0 or FFFFFFFF ignore it.
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if(!memcmp(hdrp + resplen + NE_NETNUMBER, nullnet, 4)) {
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continue;
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}
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if(!memcmp(hdrp + resplen + NE_NETNUMBER, bcastnet, 4)) {
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continue;
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}
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// should not accept route for a directly connected net
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if(IsRoute(hdrp + resplen + NE_NETNUMBER, &IpxRoute) &&
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(IpxRoute.Protocol == IPX_PROTOCOL_LOCAL)) {
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continue;
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}
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// should not accept the route if it has a bad number of ticks
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// like 0 or > 60000.
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GETSHORT2USHORT(&IpxRoute.TickCount, hdrp + resplen + NE_NROFTICKS);
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if((IpxRoute.TickCount == 0) ||
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(IpxRoute.TickCount > 60000)) {
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continue;
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}
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// Add (update) this route to the routing table
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IpxRoute.InterfaceIndex = icbp->InterfaceIndex;
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IpxRoute.Protocol = IPX_PROTOCOL_RIP;
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memcpy(IpxRoute.Network, hdrp + resplen + NE_NETNUMBER, 4);
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// if this route is learned over a point to point wan, next hop doesn't
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// make sense
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if(icbp->InterfaceType == PERMANENT) {
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memcpy(IpxRoute.NextHopMacAddress, hdrp + IPXH_SRCNODE, 6);
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}
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else
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{
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memcpy(IpxRoute.NextHopMacAddress, bcastnode, 6);
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}
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GETSHORT2USHORT(&IpxRoute.HopCount, hdrp + resplen + NE_NROFHOPS);
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if(IpxRoute.HopCount == 15) {
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IpxRoute.Flags = DO_NOT_ADVERTISE_ROUTE;
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AddRipRoute(&IpxRoute, RouteTimeToLiveSecs(icbp));
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}
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else
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{
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IpxRoute.Flags = 0;
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// add it to the table
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switch(icbp->InterfaceType) {
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case REMOTE_WORKSTATION_DIAL:
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// this RIP advertisment comes from a remote client
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// we should accept it only if this is its internal net and if
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// it doesn't conflict with a network we already have
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if ((memcmp(icbp->RemoteWkstaInternalNet, nullnet, 4)==0)
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|| (memcmp(icbp->RemoteWkstaInternalNet, IpxRoute.Network, 4)==0)) {
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// none added so far as internal net for this client
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if (!IsRoute(IpxRoute.Network, NULL)) {
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// we assume this is its internal net and it will be
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// cleaned up when interface is disconnected
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AddRipRoute(&IpxRoute, INFINITE);
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memcpy(icbp->RemoteWkstaInternalNet,
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IpxRoute.Network,
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4);
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}
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}
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// do not accept any more advertisments from this client
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return;
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case LOCAL_WORKSTATION_DIAL:
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// the interface is the local host dialed out.
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// routes received by it should not be advertised over any
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// interface but kept only for internal routing
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if (!IsRoute(IpxRoute.Network, NULL)) {
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IpxRoute.Flags = DO_NOT_ADVERTISE_ROUTE;
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AddRipRoute(&IpxRoute, INFINITE);
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}
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break;
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default:
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AddRipRoute(&IpxRoute, RouteTimeToLiveSecs(icbp));
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break;
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}
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}
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}
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else
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{
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// Delete this route from the routing table
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IpxRoute.InterfaceIndex = icbp->InterfaceIndex;
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IpxRoute.Protocol = IPX_PROTOCOL_RIP;
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memcpy(IpxRoute.Network, hdrp + resplen + NE_NETNUMBER, 4);
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memcpy(IpxRoute.NextHopMacAddress, hdrp + IPXH_SRCNODE, 6);
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GETSHORT2USHORT(&IpxRoute.TickCount, hdrp + resplen + NE_NROFTICKS);
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GETSHORT2USHORT(&IpxRoute.HopCount, hdrp + resplen + NE_NROFHOPS);
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// delete it from the table
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DeleteRipRoute(&IpxRoute);
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}
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}
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}
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/*++
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Function: StartGenResponse
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Descr: Creates a work item (packet) of type general response
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Creates a RTM enumeration handle
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Starts filling in a packet from RTM using split horizon
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Sends the packet
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--*/
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VOID
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StartGenResponse(PICB icbp,
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PUCHAR dstnodep, // dst node to send gen resp
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PUCHAR dstsocket) // dst socket to send gen resp
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{
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PWORK_ITEM wip;
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HANDLE EnumHandle;
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PUCHAR hdrp; // gen resp ipx packet header
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// allocate a work item
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if((wip = AllocateWorkItem(GEN_RESPONSE_PACKET_TYPE)) == NULL) {
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return;
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}
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// init the work item
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wip->icbp = icbp;
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wip->AdapterIndex = icbp->AdapterBindingInfo.AdapterIndex;
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// create an RTM enumeration handle
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if((EnumHandle = CreateBestRoutesEnumHandle()) == NULL) {
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FreeWorkItem(wip);
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return;
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}
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wip->WorkItemSpecific.WIS_EnumRoutes.RtmEnumerationHandle = EnumHandle;
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// make the first gen response packet
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if(MakeRipGenResponsePacket(wip,
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dstnodep,
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dstsocket) == EMPTY_PACKET) {
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// no routes to advertise for this general response
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CloseEnumHandle(EnumHandle);
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FreeWorkItem(wip);
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return;
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}
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// Send the gen response on the associated adapter
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if(IfRefSendSubmit(wip) != NO_ERROR) {
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// !!!
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CloseEnumHandle(EnumHandle);
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FreeWorkItem(wip);
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}
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}
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/*++
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Function: IfCompleteGenResponse
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Descr: Completes the gen response work item either by terminating it
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if no more routes to advertise or by
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getting the rest of the routes up to one packet and sending
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the packet
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--*/
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VOID
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IfCompleteGenResponse(PWORK_ITEM wip)
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{
|
|
USHORT opcode;
|
|
PICB icbp;
|
|
HANDLE EnumHandle;
|
|
USHORT pktlen;
|
|
|
|
EnumHandle = wip->WorkItemSpecific.WIS_EnumRoutes.RtmEnumerationHandle;
|
|
|
|
// first off - check the interface status
|
|
icbp = wip->icbp;
|
|
GETSHORT2USHORT(&pktlen, wip->Packet + IPXH_LENGTH);
|
|
|
|
// check that:
|
|
// 1. the interface is up
|
|
// 2. this was not the last packet in the response
|
|
if((icbp->IfStats.RipIfOperState != OPER_STATE_UP) ||
|
|
(pktlen < FULL_PACKET)) {
|
|
|
|
CloseEnumHandle(EnumHandle);
|
|
FreeWorkItem(wip);
|
|
|
|
return;
|
|
}
|
|
|
|
// make the next gen response packet
|
|
if(MakeRipGenResponsePacket(wip,
|
|
wip->Packet + IPXH_DESTNODE,
|
|
wip->Packet + IPXH_DESTSOCK) == EMPTY_PACKET) {
|
|
|
|
// no more routes to advertise in this gen response
|
|
CloseEnumHandle(EnumHandle);
|
|
FreeWorkItem(wip);
|
|
|
|
return;
|
|
}
|
|
|
|
// Send the gen response on the associated adapter
|
|
if(IfRefSendSubmit(wip) != NO_ERROR) {
|
|
|
|
CloseEnumHandle(EnumHandle);
|
|
FreeWorkItem(wip);
|
|
}
|
|
}
|
|
|
|
ULONG
|
|
RouteTimeToLiveSecs(PICB icbp)
|
|
{
|
|
if(icbp->IfConfigInfo.PeriodicUpdateInterval == MAXULONG) {
|
|
|
|
return INFINITE;
|
|
}
|
|
else
|
|
{
|
|
return (AGE_INTERVAL_MULTIPLIER(icbp)) * (PERIODIC_UPDATE_INTERVAL_SECS(icbp));
|
|
}
|
|
}
|