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freebsd/usr.sbin/ppp/hdlc.c
Poul-Henning Kamp 9c749ffb8b Here is a diff of /usr/src/usr.sbin/ppp against current. The diffs 
add some logging functionality which I find very useful.
'set debug link' will record just link up/down and address assignments.
'set debug connect' will record the entire chat dialog
'set debug carrier' will record just chat lines including 'CARRIER'
(so that I can be sure I'm getting a 28.8 line).

There was a global change required to permit LogPrintf to take a bit
mask instead of a bit position value (to permit logging some events
on either of two flags, so that no change in 'set debug lcp' would
result from the code supporting 'link'.  Thus the diffs are rather
long for such a small change.  The man page is also touched.

Oh, and there was a slight syntax problem in route.c

Reviewed by:	phk
Submitted by:	Tony Kimball <alk@Think.COM>
1996-05-11 20:48:42 +00:00

402 lines
10 KiB
C
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/*
* PPP High Level Link Control (HDLC) 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: hdlc.c,v 1.8 1996/01/30 20:04:31 phk Exp $
*
* TODO:
*/
#include "fsm.h"
#include "hdlc.h"
#include "lcpproto.h"
#include "lcp.h"
#include "lqr.h"
#include "vars.h"
#include "pred.h"
#include "modem.h"
#include "ccp.h"
struct hdlcstat {
int badfcs;
int badaddr;
int badcommand;
int unknownproto;
} HdlcStat;
static int ifOutPackets, ifOutOctets, ifOutLQRs;
static int ifInPackets, ifInOctets;
struct protostat {
u_short number;
char *name;
u_long in_count;
u_long out_count;
} ProtocolStat[] = {
{ PROTO_IP, "IP" },
{ PROTO_VJUNCOMP, "VJ_UNCOMP" },
{ PROTO_VJCOMP, "VJ_COMP" },
{ PROTO_COMPD, "COMPD" },
{ PROTO_LCP, "LCP" },
{ PROTO_IPCP, "IPCP" },
{ PROTO_CCP, "CCP" },
{ PROTO_PAP, "PAP" },
{ PROTO_LQR, "LQR" },
{ PROTO_CHAP, "CHAP" },
{ 0, "Others" },
};
static u_short const fcstab[256] = {
/* 00 */ 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
/* 08 */ 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
/* 10 */ 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
/* 18 */ 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
/* 20 */ 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
/* 28 */ 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
/* 30 */ 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
/* 38 */ 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
/* 40 */ 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
/* 48 */ 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
/* 50 */ 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
/* 58 */ 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
/* 60 */ 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
/* 68 */ 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
/* 70 */ 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
/* 78 */ 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
/* 80 */ 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
/* 88 */ 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
/* 90 */ 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
/* 98 */ 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
/* a0 */ 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
/* a8 */ 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
/* b0 */ 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
/* b8 */ 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
/* c0 */ 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
/* c8 */ 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
/* d0 */ 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
/* d8 */ 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
/* e0 */ 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
/* e8 */ 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
/* f0 */ 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
/* f8 */ 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
};
void
HdlcInit()
{
ifInOctets = ifOutOctets = 0;
ifInPackets = ifOutPackets = 0;
ifOutLQRs = 0;
}
/*
* HDLC FCS computation. Read RFC 1171 Appendix B and CCITT X.25 section
* 2.27 for further details.
*/
inline u_short
HdlcFcs(fcs, cp, len)
u_short fcs;
u_char *cp;
int len;
{
while (len--)
fcs = (fcs >> 8) ^ fcstab[(fcs ^ *cp++) & 0xff];
return(fcs);
}
void
HdlcOutput(int pri, u_short proto, struct mbuf *bp)
{
struct mbuf *mhp, *mfcs;
struct protostat *statp;
struct lqrdata *lqr;
u_char *cp;
u_short fcs;
if ((proto & 0xfff1) == 0x21) { /* Network Layer protocol */
if (CcpFsm.state == ST_OPENED) {
Pred1Output(pri, proto, bp);
return;
}
}
if (DEV_IS_SYNC)
mfcs = NULLBUFF;
else
mfcs = mballoc(2, MB_HDLCOUT);
mhp = mballoc(4, MB_HDLCOUT);
mhp->cnt = 0;
cp = MBUF_CTOP(mhp);
if (proto == PROTO_LCP || LcpInfo.his_acfcomp == 0) {
*cp++ = HDLC_ADDR;
*cp++ = HDLC_UI;
mhp->cnt += 2;
}
/*
* If possible, compress protocol field.
*/
if (LcpInfo.his_protocomp && (proto & 0xff00) == 0) {
*cp++ = proto;
mhp->cnt++;
} else {
*cp++ = proto >> 8;
*cp = proto & 0377;
mhp->cnt += 2;
}
mhp->next = bp;
bp->next = mfcs;
lqr = &MyLqrData;
lqr->PeerOutPackets = ifOutPackets++;
ifOutOctets += plength(mhp) + 1;
lqr->PeerOutOctets = ifOutOctets;
if (proto == PROTO_LQR) {
lqr->MagicNumber = LcpInfo.want_magic;
lqr->LastOutLQRs = HisLqrData.PeerOutLQRs;
lqr->LastOutPackets = HisLqrData.PeerOutPackets;
lqr->LastOutOctets = HisLqrData.PeerOutOctets;
lqr->PeerInLQRs = HisLqrSave.SaveInLQRs;
lqr->PeerInPackets = HisLqrSave.SaveInPackets;
lqr->PeerInDiscards = HisLqrSave.SaveInDiscards;
lqr->PeerInErrors = HisLqrSave.SaveInErrors;
lqr->PeerInOctets = HisLqrSave.SaveInOctets;
lqr->PeerOutLQRs = ++ifOutLQRs;
LqrDump("LqrOutput", lqr);
LqrChangeOrder(lqr, (struct lqrdata *)(MBUF_CTOP(bp)));
}
if (!DEV_IS_SYNC) {
fcs = HdlcFcs(INITFCS, MBUF_CTOP(mhp), mhp->cnt);
fcs = HdlcFcs(fcs, MBUF_CTOP(bp), bp->cnt);
fcs = ~fcs;
cp = MBUF_CTOP(mfcs);
*cp++ = fcs & 0377; /* Low byte first!! */
*cp++ = fcs >> 8;
}
LogDumpBp(LOG_HDLC, "HdlcOutput", mhp);
for (statp = ProtocolStat; statp->number; statp++)
if (statp->number == proto)
break;
statp->out_count++;
if (DEV_IS_SYNC)
ModemOutput(pri, mhp);
else
AsyncOutput(pri, mhp, proto);
}
void
DecodePacket(proto, bp)
u_short proto;
struct mbuf *bp;
{
#ifdef DEBUG
logprintf("proto = %04x\n", proto);
#endif
u_char *cp;
switch (proto) {
case PROTO_LCP:
LcpInput(bp);
break;
case PROTO_PAP:
PapInput(bp);
break;
case PROTO_LQR:
HisLqrSave.SaveInLQRs++;
LqrInput(bp);
break;
case PROTO_CHAP:
ChapInput(bp);
break;
case PROTO_VJUNCOMP:
case PROTO_VJCOMP:
bp = VjCompInput(bp, proto);
if (bp == NULLBUFF) {
break;
}
/* fall down */
case PROTO_IP:
IpInput(bp);
break;
case PROTO_IPCP:
IpcpInput(bp);
break;
case PROTO_CCP:
CcpInput(bp);
break;
case PROTO_COMPD:
Pred1Input(bp);
break;
default:
LogPrintf(LOG_PHASE_BIT, "Unknown protocol 0x%04x\n", proto);
bp->offset -= 2;
bp->cnt += 2;
cp = MBUF_CTOP(bp);
LcpSendProtoRej(cp, bp->cnt);
HisLqrSave.SaveInDiscards++;
HdlcStat.unknownproto++;
pfree(bp);
break;
}
}
int
ReportProtStatus()
{
struct protostat *statp;
int cnt;
statp = ProtocolStat;
statp--;
cnt = 0;
printf(" Protocol in out Protocol in out\n");
do {
statp++;
printf(" %-9s: %8lu, %8lu",
statp->name, statp->in_count, statp->out_count);
if (++cnt == 2) {
printf("\n");
cnt = 0;
}
} while (statp->number);
if (cnt)
printf("\n");
return(1);
}
int
ReportHdlcStatus()
{
struct hdlcstat *hp = &HdlcStat;
printf("HDLC level errors\n\n");
printf("FCS: %u ADDR: %u COMMAND: %u PROTO: %u\n",
hp->badfcs, hp->badaddr, hp->badcommand, hp->unknownproto);
return(1);
}
static struct hdlcstat laststat;
void
HdlcErrorCheck()
{
struct hdlcstat *hp = &HdlcStat;
struct hdlcstat *op = &laststat;
if (bcmp(hp, op, sizeof(laststat))) {
LogPrintf(LOG_PHASE_BIT, "HDLC errors -> FCS: %u ADDR: %u COMD: %u PROTO: %u\n",
hp->badfcs - op->badfcs, hp->badaddr - op->badaddr,
hp->badcommand - op->badcommand, hp->unknownproto - op->unknownproto);
}
laststat = HdlcStat;
}
void
HdlcInput(struct mbuf *bp)
{
u_short fcs, proto;
u_char *cp, addr, ctrl;
struct protostat *statp;
LogDumpBp(LOG_HDLC, "HdlcInput:", bp);
if (DEV_IS_SYNC)
fcs = GOODFCS;
else
fcs = HdlcFcs(INITFCS, MBUF_CTOP(bp), bp->cnt);
HisLqrSave.SaveInOctets += bp->cnt + 1;
#ifdef DEBUG
logprintf("fcs = %04x (%s)\n", fcs, (fcs == GOODFCS)? "good" : "bad");
#endif
if (fcs != GOODFCS) {
HisLqrSave.SaveInErrors++;
#ifdef DEBUG
logprintf("Bad FCS\n");
#endif
HdlcStat.badfcs++;
pfree(bp);
return;
}
if (!DEV_IS_SYNC)
bp->cnt -= 2; /* discard FCS part */
cp = MBUF_CTOP(bp);
ifInPackets++;
ifInOctets += bp->cnt;
if (!LcpInfo.want_acfcomp) {
/*
* We expect that packet is not compressed.
*/
addr = *cp++;
if (addr != HDLC_ADDR) {
HisLqrSave.SaveInErrors++;
HdlcStat.badaddr++;
#ifdef DEBUG
logprintf("addr %02x\n", *cp);
#endif
pfree(bp);
return;
}
ctrl = *cp++;
if (ctrl != HDLC_UI) {
HisLqrSave.SaveInErrors++;
HdlcStat.badcommand++;
#ifdef DEBUG
logprintf("command %02x\n", *cp);
#endif
pfree(bp);
return;
}
bp->offset += 2;
bp->cnt -= 2;
} else if (cp[0] == HDLC_ADDR && cp[1] == HDLC_UI) {
/*
* We can receive compressed packet, but peer still send
* uncompressed packet to me.
*/
cp += 2;
bp->offset += 2;
bp->cnt -= 2;
}
if (LcpInfo.want_protocomp) {
proto = 0;
cp--;
do {
cp++; bp->offset++; bp->cnt--;
proto = proto << 8;
proto += *cp;
} while (!(proto & 1));
} else {
proto = *cp++ << 8;
proto |= *cp++;
bp->offset += 2;
bp->cnt -= 2;
}
for (statp = ProtocolStat; statp->number; statp++)
if (statp->number == proto)
break;
statp->in_count++;
HisLqrSave.SaveInPackets++;
DecodePacket(proto, bp);
}
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