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3b0f8d2ed6
freebsd/usr.sbin/ppp/lqr.c
Brian Somers 3b0f8d2ed6 o Move struct lcp and struct ccp into struct link. 
o Remove bundle2lcp(), bundle2ccp() and bundle2link().
  They're too resource-hungry and we have `owner pointers'
  to do their job.
o Make our FSM understand LCPs that are always ST_OPENED
  (with a minimum code that != 1).
o Send FSM code rejects for invalid codes.
o Make our bundle fsm_parent deal with multiple links.
o Make timer diagnostics pretty and allow access via ~t
  in `term' mode (not just when logging debug) and
  `show timers'.  Only show timers every second in debug
  mode, otherwise we get too many diagnostics to be useful
  (we probably still do).  Also, don't restrict ~m in term
  mode to depend on debug logging.
o Rationalise our bundles' phases.
o Create struct mp (multilink protocol).  This is both an
  NCP and a type of struct link.  It feeds off other NCPs
  for output, passing fragmented packets into the queues
  of available datalinks.  It also gets PROTO_MP input,
  reassembles the fragments into ppp frames, and passes
  them back to the HDLC layer that the fragments were passed
  from.
  ** It's not yet possible to enter multilink mode :-( **
o Add `set weight' (requires context) for deciding on a links
  weighting in multilink mode.  Weighting is simplistic (and
  probably badly implemented) for now.
o Remove the function pointers in struct link.  They ended up
  only applying to physical links.
o Configure our tun device with an MTU equal to the MRU from
  struct mp's LCP and a speed equal to the sum of our link
  speeds.
o `show {lcp,ccp,proto}' and `set deflate' now have optional
  context and use ChooseLink() to decide on which `struct link'
  to use.  This allows behaviour as before when in non-multilink
  mode, and allows access to the MP logical link in multilink
  mode.
o Ignore reconnect and redial values when in -direct mode and
  when cleaning up.  Always redial when in -ddial or -dedicated
  mode (unless cleaning up).
o Tell our links to `staydown' when we close them due to a signal.
o Remove remaining `#ifdef SIGALRM's (ppp doesn't function without
  alarms).
o Don't bother strdup()ing our physical link name.
o Various other cosmetic changes.
1998-04-03 19:21:56 +00:00

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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 1.22.2.17 1998/03/25 18:37:51 brian Exp $
*
* o LQR based on RFC1333
*
* TODO:
* o LQM policy
* o Allow user to configure LQM method and interval.
*/
#include <sys/param.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <stdio.h>
#include <string.h>
#include <termios.h>
#include "command.h"
#include "mbuf.h"
#include "log.h"
#include "defs.h"
#include "timer.h"
#include "fsm.h"
#include "lcpproto.h"
#include "lcp.h"
#include "lqr.h"
#include "hdlc.h"
#include "async.h"
#include "throughput.h"
#include "ccp.h"
#include "link.h"
#include "descriptor.h"
#include "physical.h"
#include "iplist.h"
#include "slcompress.h"
#include "ipcp.h"
#include "filter.h"
#include "mp.h"
#include "bundle.h"
#include "loadalias.h"
#include "vars.h"
struct echolqr {
u_int32_t magic;
u_int32_t signature;
u_int32_t sequence;
};
#define SIGNATURE 0x594e4f54
static void
SendEchoReq(struct lcp *lcp)
{
struct hdlc *hdlc = &link2physical(lcp->fsm.link)->hdlc;
struct echolqr echo;
echo.magic = htonl(lcp->want_magic);
echo.signature = htonl(SIGNATURE);
echo.sequence = htonl(hdlc->lqm.echo.seq_sent);
FsmOutput(&lcp->fsm, CODE_ECHOREQ, hdlc->lqm.echo.seq_sent++,
(u_char *)&echo, sizeof echo);
}
void
RecvEchoLqr(struct fsm *fp, struct mbuf * bp)
{
struct hdlc *hdlc = &link2physical(fp->link)->hdlc;
struct echolqr *lqr;
u_int32_t seq;
if (plength(bp) == sizeof(struct echolqr)) {
lqr = (struct echolqr *) MBUF_CTOP(bp);
if (ntohl(lqr->signature) == SIGNATURE) {
seq = ntohl(lqr->sequence);
/* careful not to update lqm.echo.seq_recv with older values */
if ((hdlc->lqm.echo.seq_recv > (u_int32_t)0 - 5 && seq < 5) ||
(hdlc->lqm.echo.seq_recv <= (u_int32_t)0 - 5 &&
seq > hdlc->lqm.echo.seq_recv))
hdlc->lqm.echo.seq_recv = seq;
} else
LogPrintf(LogERROR, "RecvEchoLqr: Got sig 0x%08x, expecting 0x%08x !\n",
ntohl(lqr->signature), SIGNATURE);
} else
LogPrintf(LogERROR, "RecvEchoLqr: Got packet size %d, expecting %d !\n",
plength(bp), sizeof(struct echolqr));
}
void
LqrChangeOrder(struct lqrdata * src, struct lqrdata * dst)
{
u_long *sp, *dp;
int n;
sp = (u_long *) src;
dp = (u_long *) dst;
for (n = 0; n < sizeof(struct lqrdata) / sizeof(u_int32_t); n++)
*dp++ = ntohl(*sp++);
}
static void
SendLqrReport(void *v)
{
struct lcp *lcp = (struct lcp *)v;
struct hdlc *hdlc = &link2physical(lcp->fsm.link)->hdlc;
struct mbuf *bp;
StopTimer(&hdlc->lqm.timer);
if (hdlc->lqm.method & LQM_LQR) {
if (hdlc->lqm.lqr.resent > 5) {
/* XXX: Should implement LQM strategy */
LogPrintf(LogPHASE, "** Too many LQR packets lost **\n");
LogPrintf(LogLQM, "LqrOutput: Too many LQR packets lost\n");
hdlc->lqm.method = 0; /* Prevent recursion via bundle_Close() */
bundle_Close(lcp->fsm.bundle, NULL, 0);
} else {
bp = mballoc(sizeof(struct lqrdata), MB_LQR);
HdlcOutput(lcp->fsm.link, PRI_LINK, PROTO_LQR, bp);
hdlc->lqm.lqr.resent++;
}
} else if (hdlc->lqm.method & LQM_ECHO) {
if ((hdlc->lqm.echo.seq_sent > 5 &&
hdlc->lqm.echo.seq_sent - 5 > hdlc->lqm.echo.seq_recv) ||
(hdlc->lqm.echo.seq_sent <= 5 &&
hdlc->lqm.echo.seq_sent > hdlc->lqm.echo.seq_recv + 5)) {
LogPrintf(LogPHASE, "** Too many ECHO LQR packets lost **\n");
LogPrintf(LogLQM, "LqrOutput: Too many ECHO LQR packets lost\n");
hdlc->lqm.method = 0; /* Prevent recursion via bundle_Close() */
bundle_Close(lcp->fsm.bundle, NULL, 0);
} else
SendEchoReq(lcp);
}
if (hdlc->lqm.method && hdlc->lqm.timer.load)
StartTimer(&hdlc->lqm.timer);
}
void
LqrInput(struct physical *physical, struct mbuf *bp)
{
int len;
len = plength(bp);
if (len != sizeof(struct lqrdata))
LogPrintf(LogERROR, "LqrInput: Got packet size %d, expecting %d !\n",
len, sizeof(struct lqrdata));
else if (!Acceptable(ConfLqr)) {
bp->offset -= 2;
bp->cnt += 2;
lcp_SendProtoRej(physical->hdlc.lqm.owner, MBUF_CTOP(bp), bp->cnt);
} else {
struct lqrdata *lqr;
struct lcp *lcp;
u_int32_t lastLQR;
lqr = (struct lqrdata *)MBUF_CTOP(bp);
lcp = physical->hdlc.lqm.owner;
if (ntohl(lqr->MagicNumber) != physical->hdlc.lqm.owner->his_magic)
LogPrintf(LogERROR, "LqrInput: magic %x != expecting %x\n",
ntohl(lqr->MagicNumber), physical->hdlc.lqm.owner->his_magic);
else {
/*
* Remember our PeerInLQRs, then convert byte order and save
*/
lastLQR = physical->hdlc.lqm.lqr.peer.PeerInLQRs;
physical->hdlc.lqm.method |= LQM_LQR;
LqrChangeOrder(lqr, &physical->hdlc.lqm.lqr.peer);
LqrDump("Input", &physical->hdlc.lqm.lqr.peer);
/* we have received an LQR from peer */
physical->hdlc.lqm.lqr.resent = 0;
/*
* Generate an LQR response if we're not running an LQR timer OR
* two successive LQR's PeerInLQRs are the same OR we're not going to
* send our next one before the peers max timeout.
*/
if (physical->hdlc.lqm.timer.load == 0 ||
(lastLQR && lastLQR == physical->hdlc.lqm.lqr.peer.PeerInLQRs) ||
(physical->hdlc.lqm.lqr.peer_timeout &&
physical->hdlc.lqm.timer.rest * 100 / SECTICKS >
physical->hdlc.lqm.lqr.peer_timeout))
SendLqrReport(physical->hdlc.lqm.owner);
}
}
pfree(bp);
}
/*
* When LCP is reached to opened state, We'll start LQM activity.
*/
void
StartLqm(struct lcp *lcp)
{
struct physical *physical = link2physical(lcp->fsm.link);
physical->hdlc.lqm.lqr.resent = 0;
physical->hdlc.lqm.echo.seq_sent = 0;
physical->hdlc.lqm.echo.seq_recv = 0;
memset(&physical->hdlc.lqm.lqr.peer, '\0',
sizeof physical->hdlc.lqm.lqr.peer);
physical->hdlc.lqm.method = LQM_ECHO;
if (Enabled(ConfLqr) && !REJECTED(lcp, TY_QUALPROTO))
physical->hdlc.lqm.method |= LQM_LQR;
StopTimer(&physical->hdlc.lqm.timer);
physical->hdlc.lqm.lqr.peer_timeout = lcp->his_lqrperiod;
physical->hdlc.lqm.owner = lcp;
if (lcp->his_lqrperiod)
LogPrintf(LogLQM, "Expecting LQR every %d.%02d secs\n",
lcp->his_lqrperiod / 100, lcp->his_lqrperiod % 100);
if (lcp->want_lqrperiod) {
LogPrintf(LogLQM, "Will send %s every %d.%02d secs\n",
physical->hdlc.lqm.method & LQM_LQR ? "LQR" : "ECHO LQR",
lcp->want_lqrperiod / 100, lcp->want_lqrperiod % 100);
physical->hdlc.lqm.timer.state = TIMER_STOPPED;
physical->hdlc.lqm.timer.load = lcp->want_lqrperiod * SECTICKS / 100;
physical->hdlc.lqm.timer.func = SendLqrReport;
physical->hdlc.lqm.timer.name = "lqm";
physical->hdlc.lqm.timer.arg = lcp;
SendLqrReport(lcp);
} else {
physical->hdlc.lqm.timer.load = 0;
if (!lcp->his_lqrperiod)
LogPrintf(LogLQM, "LQR/ECHO LQR not negotiated\n");
}
}
void
StopLqrTimer(struct physical *physical)
{
StopTimer(&physical->hdlc.lqm.timer);
}
void
StopLqr(struct physical *physical, int method)
{
LogPrintf(LogLQM, "StopLqr method = %x\n", method);
if (method == LQM_LQR)
LogPrintf(LogLQM, "Stop sending LQR, Use LCP ECHO instead.\n");
if (method == LQM_ECHO)
LogPrintf(LogLQM, "Stop sending LCP ECHO.\n");
physical->hdlc.lqm.method &= ~method;
if (physical->hdlc.lqm.method)
SendLqrReport(physical->hdlc.lqm.owner);
else
StopTimer(&physical->hdlc.lqm.timer);
}
void
LqrDump(const char *message, const struct lqrdata * lqr)
{
if (LogIsKept(LogLQM)) {
LogPrintf(LogLQM, "%s:\n", message);
LogPrintf(LogLQM, " Magic: %08x LastOutLQRs: %08x\n",
lqr->MagicNumber, lqr->LastOutLQRs);
LogPrintf(LogLQM, " LastOutPackets: %08x LastOutOctets: %08x\n",
lqr->LastOutPackets, lqr->LastOutOctets);
LogPrintf(LogLQM, " PeerInLQRs: %08x PeerInPackets: %08x\n",
lqr->PeerInLQRs, lqr->PeerInPackets);
LogPrintf(LogLQM, " PeerInDiscards: %08x PeerInErrors: %08x\n",
lqr->PeerInDiscards, lqr->PeerInErrors);
LogPrintf(LogLQM, " PeerInOctets: %08x PeerOutLQRs: %08x\n",
lqr->PeerInOctets, lqr->PeerOutLQRs);
LogPrintf(LogLQM, " PeerOutPackets: %08x PeerOutOctets: %08x\n",
lqr->PeerOutPackets, lqr->PeerOutOctets);
}
}
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