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/*
* PPP Line Quality Monitoring (LQM) Module
*
* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
*
* Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the Internet Initiative Japan, Inc. The name of the
* IIJ may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* $Id: lqr.c,v 1.6 1996/01/30 11:08:37 dfr Exp $
*
* o LQR based on RFC1333
*
* TODO:
* o LQM policy
* o Allow user to configure LQM method and interval.
*/
#include "fsm.h"
#include "lcpproto.h"
#include "lqr.h"
#include "hdlc.h"
#include "lcp.h"
#include "vars.h"
#include "main.h"
struct pppTimer LqrTimer;
static u_long lastpeerin = (u_long)-1;
static int lqmmethod;
static int echoseq;
static int gotseq;
static int lqrsendcnt;
struct echolqr {
u_long magic;
u_long signature;
u_long sequence;
};
#define SIGNATURE 0x594e4f54
static void
SendEchoReq()
{
struct fsm *fp = &LcpFsm;
struct echolqr *lqr, lqrdata;
if (fp->state == ST_OPENED) {
lqr = &lqrdata;
lqr->magic = htonl(LcpInfo.want_magic);
lqr->signature = htonl(SIGNATURE);
LogPrintf(LOG_LQM_BIT, "Send echo LQR [%d]\n", echoseq);
lqr->sequence = htonl(echoseq++);
FsmOutput(fp, CODE_ECHOREQ, fp->reqid++,
(u_char *)lqr, sizeof(struct echolqr));
}
}
void
RecvEchoLqr(bp)
struct mbuf *bp;
{
struct echolqr *lqr;
u_long seq;
if (plength(bp) == sizeof(struct echolqr)) {
lqr = (struct echolqr *)MBUF_CTOP(bp);
if (htonl(lqr->signature) == SIGNATURE) {
seq = ntohl(lqr->sequence);
LogPrintf(LOG_LQM_BIT, "Got echo LQR [%d]\n", ntohl(lqr->sequence));
gotseq = seq;
}
}
}
void
LqrChangeOrder(src, dst)
struct lqrdata *src, *dst;
{
u_long *sp, *dp;
int n;
sp = (u_long *)src; dp = (u_long *)dst;
for (n = 0; n < sizeof(struct lqrdata)/sizeof(u_long); n++)
*dp++ = ntohl(*sp++);
}
static void
SendLqrReport()
{
struct mbuf *bp;
StopTimer(&LqrTimer);
if (lqmmethod & LQM_LQR) {
if (lqrsendcnt > 5) {
/*
* XXX: Should implement LQM strategy
*/
LogPrintf(LOG_PHASE_BIT, "** 1 Too many ECHO packets are lost. **\n");
lqmmethod = 0; /* Prevent rcursion via LcpClose() */
LcpClose();
} else {
bp = mballoc(sizeof(struct lqrdata), MB_LQR);
HdlcOutput(PRI_LINK, PROTO_LQR, bp);
lqrsendcnt++;
}
} else if (lqmmethod & LQM_ECHO) {
if (echoseq - gotseq > 5) {
LogPrintf(LOG_PHASE_BIT, "** 2 Too many ECHO packets are lost. **\n");
lqmmethod = 0; /* Prevent rcursion via LcpClose() */
LcpClose();
} else
SendEchoReq();
}
if (lqmmethod && Enabled(ConfLqr))
StartTimer(&LqrTimer);
}
void
LqrInput(struct mbuf *bp)
{
int len;
u_char *cp;
struct lqrdata *lqr;
len = plength(bp);
if (len != sizeof(struct lqrdata)) {
pfree(bp);
return;
}
if (!Acceptable(ConfLqr)) {
bp->offset -= 2;
bp->cnt += 2;
cp = MBUF_CTOP(bp);
LcpSendProtoRej(cp, bp->cnt);
} else {
cp = MBUF_CTOP(bp);
lqr = (struct lqrdata *)cp;
if (ntohl(lqr->MagicNumber) != LcpInfo.his_magic) {
#ifdef notdef
logprintf("*** magic %x != expecting %x\n", ntohl(lqr->MagicNumber), LcpInfo.his_magic);
#endif
pfree(bp);
return;
}
/*
* Convert byte order and save into our strage
*/
LqrChangeOrder(lqr, &HisLqrData);
LqrDump("LqrInput", &HisLqrData);
lqrsendcnt = 0; /* we have received LQR from peer */
/*
* Generate LQR responce to peer, if
* i) We are not running LQR timer.
* ii) Two successive LQR's PeerInLQRs are same.
*/
if (LqrTimer.load == 0 || lastpeerin == HisLqrData.PeerInLQRs) {
lqmmethod |= LQM_LQR;
SendLqrReport();
}
lastpeerin = HisLqrData.PeerInLQRs;
}
pfree(bp);
}
/*
* When LCP is reached to opened state, We'll start LQM activity.
*/
void
StartLqm()
{
struct lcpstate *lcp = &LcpInfo;
int period;
lqmmethod = LQM_ECHO;
if (Enabled(ConfLqr))
lqmmethod |= LQM_LQR;
StopTimer(&LqrTimer);
LogPrintf(LOG_LQM_BIT, "LQM method = %d\n", lqmmethod);
if (lcp->his_lqrperiod || lcp->want_lqrperiod) {
/*
* We need to run timer. Let's figure out period.
*/
period = lcp->his_lqrperiod ? lcp->his_lqrperiod : lcp->want_lqrperiod;
StopTimer(&LqrTimer);
LqrTimer.state = TIMER_STOPPED;
LqrTimer.load = period * SECTICKS / 100;
LqrTimer.func = SendLqrReport;
SendLqrReport();
StartTimer(&LqrTimer);
LogPrintf(LOG_LQM_BIT, "Will send LQR every %d.%d secs\n",
period/100, period % 100);
} else {
LogPrintf(LOG_LQM_BIT, "LQR is not activated.\n");
}
}
void
StopLqrTimer(void)
{
StopTimer(&LqrTimer);
}
void
StopLqr(method)
int method;
{
LogPrintf(LOG_LQM_BIT, "StopLqr method = %x\n", method);
if (method == LQM_LQR)
LogPrintf(LOG_LQM_BIT, "Stop sending LQR, Use LCP ECHO instead.\n");
if (method == LQM_ECHO)
LogPrintf(LOG_LQM_BIT, "Stop sending LCP ECHO.\n");
lqmmethod &= ~method;
if (lqmmethod)
SendLqrReport();
else
StopTimer(&LqrTimer);
}
void
LqrDump(message, lqr)
char *message;
struct lqrdata *lqr;
{
if (loglevel & (1 << LOG_LQM)) {
LogTimeStamp();
logprintf("%s:\n", message);
LogTimeStamp();
logprintf(" Magic: %08x LastOutLQRs: %08x\n",
lqr->MagicNumber, lqr->LastOutLQRs);
LogTimeStamp();
logprintf(" LastOutPackets: %08x LastOutOctets: %08x\n",
lqr->LastOutPackets, lqr->LastOutOctets);
LogTimeStamp();
logprintf(" PeerInLQRs: %08x PeerInPackets: %08x\n",
lqr->PeerInLQRs, lqr->PeerInPackets);
LogTimeStamp();
logprintf(" PeerInDiscards: %08x PeerInErrors: %08x\n",
lqr->PeerInDiscards, lqr->PeerInErrors);
LogTimeStamp();
logprintf(" PeerInOctets: %08x PeerOutLQRs: %08x\n",
lqr->PeerInOctets, lqr->PeerOutLQRs);
LogTimeStamp();
logprintf(" PeerOutPackets: %08x PeerOutOctets: %08x\n",
lqr->PeerOutPackets, lqr->PeerOutOctets);
}
}
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