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freebsd-skq/usr.sbin/ppp/lcp.c
Brian Somers 70ee81ff6b Cosmetic (style): 
sizeof(var) -> sizeof var
  sizeof type -> sizeof(type)

Suggested by: J Wunsch <j@uriah.heep.sax.de>
1997-12-24 09:29:17 +00:00

834 lines
19 KiB
C
Raw Blame History

/*
* PPP Link Control Protocol (LCP) 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: lcp.c,v 1.50 1997/12/07 23:55:27 brian Exp $
*
* TODO:
* o Validate magic number received from peer.
* o Limit data field length by MRU
*/
#include <sys/param.h>
#include <sys/time.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/if.h>
#ifdef __FreeBSD__
#include <net/if_var.h>
#endif
#include <net/if_tun.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <termios.h>
#include <unistd.h>
#include "command.h"
#include "mbuf.h"
#include "log.h"
#include "defs.h"
#include "timer.h"
#include "fsm.h"
#include "lcp.h"
#include "ipcp.h"
#include "lcpproto.h"
#include "os.h"
#include "hdlc.h"
#include "ccp.h"
#include "lqr.h"
#include "phase.h"
#include "loadalias.h"
#include "vars.h"
#include "auth.h"
#include "pap.h"
#include "chap.h"
#include "async.h"
#include "main.h"
#include "ip.h"
#include "modem.h"
#include "tun.h"
/* for received LQRs */
struct lqrreq {
u_char type;
u_char length;
u_short proto; /* Quality protocol */
u_long period; /* Reporting interval */
};
struct lcpstate LcpInfo;
static void LcpSendConfigReq(struct fsm *);
static void LcpSendTerminateReq(struct fsm *);
static void LcpSendTerminateAck(struct fsm *);
static void LcpDecodeConfig(u_char *, int, int);
static void LcpInitRestartCounter(struct fsm *);
static void LcpLayerUp(struct fsm *);
static void LcpLayerDown(struct fsm *);
static void LcpLayerStart(struct fsm *);
static void LcpLayerFinish(struct fsm *);
static const char *cftypes[] = {
/* Check out the latest ``Assigned numbers'' rfc (rfc1700.txt) */
"???",
"MRU", /* 1: Maximum-Receive-Unit */
"ACCMAP", /* 2: Async-Control-Character-Map */
"AUTHPROTO", /* 3: Authentication-Protocol */
"QUALPROTO", /* 4: Quality-Protocol */
"MAGICNUM", /* 5: Magic-Number */
"RESERVED", /* 6: RESERVED */
"PROTOCOMP", /* 7: Protocol-Field-Compression */
"ACFCOMP", /* 8: Address-and-Control-Field-Compression */
"FCSALT", /* 9: FCS-Alternatives */
"SDP", /* 10: Self-Describing-Pad */
"NUMMODE", /* 11: Numbered-Mode */
"MULTIPROC", /* 12: Multi-Link-Procedure */
"CALLBACK", /* 13: Callback */
"CONTIME", /* 14: Connect-Time */
"COMPFRAME", /* 15: Compound-Frames */
"NDE", /* 16: Nominal-Data-Encapsulation */
"MULTIMRRU", /* 17: Multilink-MRRU */
"MULTISSNH", /* 18: Multilink-Short-Sequence-Number-Header */
"MULTIED", /* 19: Multilink-Endpoint-Descriminator */
"PROPRIETRY", /* 20: Proprietary */
"DCEID", /* 21: DCE-Identifier */
"MULTIPP", /* 22: Multi-Link-Plus-Procedure */
"LDBACP", /* 23: Link Discriminator for BACP */
};
#define NCFTYPES (sizeof cftypes/sizeof cftypes[0])
struct fsm LcpFsm = {
"LCP", /* Name of protocol */
PROTO_LCP, /* Protocol Number */
LCP_MAXCODE,
OPEN_ACTIVE,
ST_INITIAL, /* State of machine */
0, 0, 0,
0,
{0, 0, 0, NULL, NULL, NULL},
{0, 0, 0, NULL, NULL, NULL},
LogLCP,
LcpLayerUp,
LcpLayerDown,
LcpLayerStart,
LcpLayerFinish,
LcpInitRestartCounter,
LcpSendConfigReq,
LcpSendTerminateReq,
LcpSendTerminateAck,
LcpDecodeConfig,
};
static struct pppTimer LcpReportTimer;
static int LcpFailedMagic;
static void
LcpReportTime(void *data)
{
if (LogIsKept(LogDEBUG)) {
time_t t;
time(&t);
LogPrintf(LogDEBUG, "LcpReportTime: %s\n", ctime(&t));
}
StopTimer(&LcpReportTimer);
LcpReportTimer.state = TIMER_STOPPED;
StartTimer(&LcpReportTimer);
HdlcErrorCheck();
}
int
ReportLcpStatus(struct cmdargs const *arg)
{
struct lcpstate *lcp = &LcpInfo;
struct fsm *fp = &LcpFsm;
if (!VarTerm)
return 1;
fprintf(VarTerm, "%s [%s]\n", fp->name, StateNames[fp->state]);
fprintf(VarTerm,
" his side: MRU %ld, ACCMAP %08lx, PROTOCOMP %d, ACFCOMP %d, MAGIC %08lx,\n"
" REJECT %04lx\n",
lcp->his_mru, lcp->his_accmap, lcp->his_protocomp, lcp->his_acfcomp,
lcp->his_magic, lcp->his_reject);
fprintf(VarTerm,
" my side: MRU %ld, ACCMAP %08lx, PROTOCOMP %d, ACFCOMP %d, MAGIC %08lx,\n"
" REJECT %04lx\n",
lcp->want_mru, lcp->want_accmap, lcp->want_protocomp, lcp->want_acfcomp,
lcp->want_magic, lcp->my_reject);
fprintf(VarTerm, "\nDefaults: MRU = %ld, ACCMAP = %08x\t", VarMRU, VarAccmap);
fprintf(VarTerm, "Open Mode: %s\n", (VarOpenMode == OPEN_ACTIVE) ? "active" : "passive");
return 0;
}
/*
* Generate random number which will be used as magic number.
*/
static u_long
GenerateMagic(void)
{
randinit();
return (random());
}
void
LcpInit()
{
struct lcpstate *lcp = &LcpInfo;
FsmInit(&LcpFsm);
HdlcInit();
memset(lcp, '\0', sizeof(struct lcpstate));
lcp->want_mru = VarMRU;
lcp->his_mru = DEF_MRU;
lcp->his_accmap = 0xffffffff;
lcp->want_accmap = VarAccmap;
lcp->want_magic = GenerateMagic();
lcp->want_auth = lcp->his_auth = 0;
if (Enabled(ConfChap))
lcp->want_auth = PROTO_CHAP;
else if (Enabled(ConfPap))
lcp->want_auth = PROTO_PAP;
if (Enabled(ConfLqr))
lcp->want_lqrperiod = VarLqrTimeout * 100;
if (Enabled(ConfAcfcomp))
lcp->want_acfcomp = 1;
if (Enabled(ConfProtocomp))
lcp->want_protocomp = 1;
LcpFsm.maxconfig = 10;
}
static void
LcpInitRestartCounter(struct fsm * fp)
{
fp->FsmTimer.load = VarRetryTimeout * SECTICKS;
fp->restart = 5;
}
int
LcpPutConf(int log, u_char *tgt, const struct lcp_opt *o, const char *nm,
const char *arg, ...)
{
va_list ap;
char buf[30];
va_start(ap, arg);
memcpy(tgt, o, o->len);
if (arg == NULL || *arg == '\0')
LogPrintf(log, " %s[%d]\n", nm, o->len);
else {
vsnprintf(buf, sizeof buf, arg, ap);
LogPrintf(log, " %s[%d] %s\n", nm, o->len, buf);
}
va_end(ap);
return o->len;
}
#define PUTN(ty) \
do { \
o.id = ty; \
o.len = 2; \
cp += LcpPutConf(LogLCP, cp, &o, cftypes[o.id], NULL); \
} while (0)
#define PUTHEXL(ty, arg) \
do { \
o.id = ty; \
o.len = 6; \
*(u_long *)o.data = htonl(arg); \
cp += LcpPutConf(LogLCP, cp, &o, cftypes[o.id], "0x%08x", (u_int)arg);\
} while (0)
#define PUTACCMAP(arg) PUTHEXL(TY_ACCMAP, arg)
#define PUTMAGIC(arg) PUTHEXL(TY_MAGICNUM, arg)
#define PUTMRU(arg) \
do { \
o.id = TY_MRU; \
o.len = 4; \
*(u_short *)o.data = htons(arg); \
cp += LcpPutConf(LogLCP, cp, &o, cftypes[o.id], "%lu", arg); \
} while (0)
#define PUTLQR(period) \
do { \
o.id = TY_QUALPROTO; \
o.len = 8; \
*(u_short *)o.data = htons(PROTO_LQR); \
*(u_long *)(o.data+2) = htonl(period); \
cp += LcpPutConf(LogLCP, cp, &o, cftypes[o.id], "period %ld", period);\
} while (0)
#define PUTPAP() \
do { \
o.id = TY_AUTHPROTO; \
o.len = 4; \
*(u_short *)o.data = htons(PROTO_PAP); \
cp += LcpPutConf(LogLCP, cp, &o, cftypes[o.id], \
"0x%04x (PAP)", PROTO_PAP); \
} while (0)
#define PUTCHAP(val) \
do { \
o.id = TY_AUTHPROTO; \
o.len = 5; \
*(u_short *)o.data = htons(PROTO_CHAP); \
o.data[2] = val; \
cp += LcpPutConf(LogLCP, cp, &o, cftypes[o.id], \
"0x%04x (CHAP 0x%02x)", PROTO_CHAP, val); \
} while (0)
#define PUTMD5CHAP() PUTCHAP(0x05)
#define PUTMSCHAP() PUTCHAP(0x80)
static void
LcpSendConfigReq(struct fsm * fp)
{
u_char *cp;
struct lcpstate *lcp = &LcpInfo;
struct lcp_opt o;
LogPrintf(LogLCP, "LcpSendConfigReq\n");
cp = ReqBuff;
if (!DEV_IS_SYNC) {
if (lcp->want_acfcomp && !REJECTED(lcp, TY_ACFCOMP))
PUTN(TY_ACFCOMP);
if (lcp->want_protocomp && !REJECTED(lcp, TY_PROTOCOMP))
PUTN(TY_PROTOCOMP);
if (!REJECTED(lcp, TY_ACCMAP))
PUTACCMAP(lcp->want_accmap);
}
if (!REJECTED(lcp, TY_MRU))
PUTMRU(lcp->want_mru);
if (lcp->want_magic && !REJECTED(lcp, TY_MAGICNUM))
PUTMAGIC(lcp->want_magic);
if (lcp->want_lqrperiod && !REJECTED(lcp, TY_QUALPROTO))
PUTLQR(lcp->want_lqrperiod);
switch (lcp->want_auth) {
case PROTO_PAP:
PUTPAP();
break;
case PROTO_CHAP:
#ifdef HAVE_DES
if (VarMSChap)
PUTMSCHAP(); /* Use MSChap */
else
#endif
PUTMD5CHAP(); /* Use MD5 */
break;
}
FsmOutput(fp, CODE_CONFIGREQ, fp->reqid++, ReqBuff, cp - ReqBuff);
}
void
LcpSendProtoRej(u_char * option, int count)
{
struct fsm *fp = &LcpFsm;
LogPrintf(LogLCP, "LcpSendProtoRej\n");
FsmOutput(fp, CODE_PROTOREJ, fp->reqid, option, count);
}
static void
LcpSendTerminateReq(struct fsm * fp)
{
/* Most thins are done in fsm layer. Nothing to to. */
}
static void
LcpSendTerminateAck(struct fsm * fp)
{
LogPrintf(LogLCP, "LcpSendTerminateAck.\n");
FsmOutput(fp, CODE_TERMACK, fp->reqid++, NULL, 0);
}
static void
LcpLayerStart(struct fsm * fp)
{
LogPrintf(LogLCP, "LcpLayerStart\n");
NewPhase(PHASE_ESTABLISH);
}
static void
StopAllTimers(void)
{
StopTimer(&LcpReportTimer);
StopIdleTimer();
StopTimer(&AuthPapInfo.authtimer);
StopTimer(&AuthChapInfo.authtimer);
StopLqrTimer();
}
static void
LcpLayerFinish(struct fsm * fp)
{
LogPrintf(LogLCP, "LcpLayerFinish\n");
HangupModem(0);
StopAllTimers();
/* We're down at last. Lets tell background and direct mode to get out */
NewPhase(PHASE_DEAD);
LcpInit();
IpcpInit();
CcpInit();
Prompt();
}
static void
LcpLayerUp(struct fsm * fp)
{
LogPrintf(LogLCP, "LcpLayerUp\n");
tun_configure(LcpInfo.his_mru, ModemSpeed());
SetLinkParams(&LcpInfo);
NewPhase(PHASE_AUTHENTICATE);
StartLqm();
StopTimer(&LcpReportTimer);
LcpReportTimer.state = TIMER_STOPPED;
LcpReportTimer.load = 60 * SECTICKS;
LcpReportTimer.func = LcpReportTime;
StartTimer(&LcpReportTimer);
}
static void
LcpLayerDown(struct fsm * fp)
{
StopAllTimers();
OsLinkdown();
LogPrintf(LogLCP, "LcpLayerDown\n");
/*
* OsLinkdown() brings CCP & IPCP down, then waits 'till we go from
* STOPPING to STOPPED. At this point, the FSM gives us a LayerFinish
*/
}
void
LcpUp()
{
FsmUp(&LcpFsm);
LcpFailedMagic = 0;
}
void
LcpDown()
{ /* Sudden death */
LcpFailedMagic = 0;
FsmDown(&LcpFsm);
/* FsmDown() results in a LcpLayerDown() if we're currently open. */
LcpLayerFinish(&LcpFsm);
}
void
LcpOpen(int open_mode)
{
LcpFsm.open_mode = open_mode;
LcpFailedMagic = 0;
FsmOpen(&LcpFsm);
}
void
LcpClose()
{
NewPhase(PHASE_TERMINATE);
OsInterfaceDown(0);
FsmClose(&LcpFsm);
LcpFailedMagic = 0;
}
/*
* XXX: Should validate option length
*/
static void
LcpDecodeConfig(u_char *cp, int plen, int mode_type)
{
int type, length, mru, mtu, sz, pos;
u_long *lp, magic, accmap;
u_short *sp, proto;
struct lqrreq *req;
char request[20], desc[22];
ackp = AckBuff;
nakp = NakBuff;
rejp = RejBuff;
while (plen >= sizeof(struct fsmconfig)) {
type = *cp;
length = cp[1];
if (type < 0 || type >= NCFTYPES)
snprintf(request, sizeof request, " <%d>[%d]", type, length);
else
snprintf(request, sizeof request, " %s[%d]", cftypes[type], length);
switch (type) {
case TY_MRU:
sp = (u_short *) (cp + 2);
mru = htons(*sp);
LogPrintf(LogLCP, "%s %d\n", request, mru);
switch (mode_type) {
case MODE_REQ:
mtu = VarPrefMTU;
if (mtu == 0)
mtu = MAX_MTU;
if (mru > mtu) {
*sp = htons(mtu);
memcpy(nakp, cp, 4);
nakp += 4;
} else if (mru < MIN_MRU) {
*sp = htons(MIN_MRU);
memcpy(nakp, cp, 4);
nakp += 4;
} else {
LcpInfo.his_mru = mru;
memcpy(ackp, cp, 4);
ackp += 4;
}
break;
case MODE_NAK:
if (mru >= MIN_MRU || mru <= MAX_MRU)
LcpInfo.want_mru = mru;
break;
case MODE_REJ:
LcpInfo.his_reject |= (1 << type);
break;
}
break;
case TY_ACCMAP:
lp = (u_long *) (cp + 2);
accmap = htonl(*lp);
LogPrintf(LogLCP, "%s 0x%08x\n", request, accmap);
switch (mode_type) {
case MODE_REQ:
LcpInfo.his_accmap = accmap;
memcpy(ackp, cp, 6);
ackp += 6;
break;
case MODE_NAK:
LcpInfo.want_accmap = accmap;
break;
case MODE_REJ:
LcpInfo.his_reject |= (1 << type);
break;
}
break;
case TY_AUTHPROTO:
sp = (u_short *) (cp + 2);
proto = ntohs(*sp);
switch (proto) {
case PROTO_PAP:
LogPrintf(LogLCP, "%s 0x%04x (PAP)\n", request, proto);
break;
case PROTO_CHAP:
LogPrintf(LogLCP, "%s 0x%04x (CHAP 0x%02x)\n", request, proto, cp[4]);
break;
default:
LogPrintf(LogLCP, "%s 0x%04x\n", request, proto);
break;
}
switch (mode_type) {
case MODE_REQ:
switch (proto) {
case PROTO_PAP:
if (length != 4) {
LogPrintf(LogLCP, " Bad length!\n");
goto reqreject;
}
if (Acceptable(ConfPap)) {
LcpInfo.his_auth = proto;
memcpy(ackp, cp, length);
ackp += length;
} else if (Acceptable(ConfChap)) {
*nakp++ = *cp;
*nakp++ = 5;
*nakp++ = (unsigned char) (PROTO_CHAP >> 8);
*nakp++ = (unsigned char) PROTO_CHAP;
#ifdef HAVE_DES
if (VarMSChap)
*nakp++ = 0x80;
else
#endif
*nakp++ = 5;
} else
goto reqreject;
break;
case PROTO_CHAP:
if (length < 5) {
LogPrintf(LogLCP, " Bad length!\n");
goto reqreject;
}
#ifdef HAVE_DES
if (Acceptable(ConfChap) && (cp[4] == 5 || cp[4] == 0x80))
#else
if (Acceptable(ConfChap) && cp[4] == 5)
#endif
{
LcpInfo.his_auth = proto;
memcpy(ackp, cp, length);
ackp += length;
#ifdef HAVE_DES
VarMSChap = cp[4] == 0x80;
#endif
} else if (Acceptable(ConfPap)) {
*nakp++ = *cp;
*nakp++ = 4;
*nakp++ = (unsigned char) (PROTO_PAP >> 8);
*nakp++ = (unsigned char) PROTO_PAP;
} else
goto reqreject;
break;
default:
LogPrintf(LogLCP, "%s 0x%04x - not recognised, NAK\n",
request, proto);
memcpy(nakp, cp, length);
nakp += length;
break;
}
break;
case MODE_NAK:
switch (proto) {
case PROTO_PAP:
if (Enabled(ConfPap))
LcpInfo.want_auth = PROTO_PAP;
else {
LogPrintf(LogLCP, "Peer will only send PAP (not enabled)\n");
LcpInfo.his_reject |= (1 << type);
}
break;
case PROTO_CHAP:
if (Enabled(ConfChap))
LcpInfo.want_auth = PROTO_CHAP;
else {
LogPrintf(LogLCP, "Peer will only send CHAP (not enabled)\n");
LcpInfo.his_reject |= (1 << type);
}
break;
default:
/* We've been NAK'd with something we don't understand :-( */
LcpInfo.his_reject |= (1 << type);
break;
}
break;
case MODE_REJ:
LcpInfo.his_reject |= (1 << type);
break;
}
break;
case TY_QUALPROTO:
req = (struct lqrreq *) cp;
LogPrintf(LogLCP, "%s proto %x, interval %dms\n",
request, ntohs(req->proto), ntohl(req->period) * 10);
switch (mode_type) {
case MODE_REQ:
if (ntohs(req->proto) != PROTO_LQR || !Acceptable(ConfLqr))
goto reqreject;
else {
LcpInfo.his_lqrperiod = ntohl(req->period);
if (LcpInfo.his_lqrperiod < 500)
LcpInfo.his_lqrperiod = 500;
req->period = htonl(LcpInfo.his_lqrperiod);
memcpy(ackp, cp, length);
ackp += length;
}
break;
case MODE_NAK:
break;
case MODE_REJ:
LcpInfo.his_reject |= (1 << type);
break;
}
break;
case TY_MAGICNUM:
lp = (u_long *) (cp + 2);
magic = ntohl(*lp);
LogPrintf(LogLCP, "%s 0x%08x\n", request, magic);
switch (mode_type) {
case MODE_REQ:
if (LcpInfo.want_magic) {
/* Validate magic number */
if (magic == LcpInfo.want_magic) {
LogPrintf(LogLCP, "Magic is same (%08x) - %d times\n",
magic, ++LcpFailedMagic);
LcpInfo.want_magic = GenerateMagic();
memcpy(nakp, cp, 6);
nakp += 6;
ualarm(TICKUNIT * (4 + 4 * LcpFailedMagic), 0);
sigpause(0);
} else {
LcpInfo.his_magic = magic;
memcpy(ackp, cp, length);
ackp += length;
LcpFailedMagic = 0;
}
} else {
LcpInfo.my_reject |= (1 << type);
goto reqreject;
}
break;
case MODE_NAK:
LogPrintf(LogLCP, " Magic 0x%08x is NAKed!\n", magic);
LcpInfo.want_magic = GenerateMagic();
break;
case MODE_REJ:
LogPrintf(LogLCP, " Magic 0x%80x is REJected!\n", magic);
LcpInfo.want_magic = 0;
LcpInfo.his_reject |= (1 << type);
break;
}
break;
case TY_PROTOCOMP:
LogPrintf(LogLCP, "%s\n", request);
switch (mode_type) {
case MODE_REQ:
if (Acceptable(ConfProtocomp)) {
LcpInfo.his_protocomp = 1;
memcpy(ackp, cp, 2);
ackp += 2;
} else {
#ifdef OLDMST
/*
* MorningStar before v1.3 needs NAK
*/
memcpy(nakp, cp, 2);
nakp += 2;
#else
memcpy(rejp, cp, 2);
rejp += 2;
LcpInfo.my_reject |= (1 << type);
#endif
}
break;
case MODE_NAK:
case MODE_REJ:
LcpInfo.want_protocomp = 0;
LcpInfo.his_reject |= (1 << type);
break;
}
break;
case TY_ACFCOMP:
LogPrintf(LogLCP, "%s\n", request);
switch (mode_type) {
case MODE_REQ:
if (Acceptable(ConfAcfcomp)) {
LcpInfo.his_acfcomp = 1;
memcpy(ackp, cp, 2);
ackp += 2;
} else {
#ifdef OLDMST
/*
* MorningStar before v1.3 needs NAK
*/
memcpy(nakp, cp, 2);
nakp += 2;
#else
memcpy(rejp, cp, 2);
rejp += 2;
LcpInfo.my_reject |= (1 << type);
#endif
}
break;
case MODE_NAK:
case MODE_REJ:
LcpInfo.want_acfcomp = 0;
LcpInfo.his_reject |= (1 << type);
break;
}
break;
case TY_SDP:
LogPrintf(LogLCP, "%s\n", request);
switch (mode_type) {
case MODE_REQ:
case MODE_NAK:
case MODE_REJ:
break;
}
break;
default:
sz = (sizeof desc - 2) / 2;
if (sz > length - 2)
sz = length - 2;
pos = 0;
desc[0] = sz ? ' ' : '\0';
for (pos = 0; sz--; pos++)
sprintf(desc+(pos<<1)+1, "%02x", cp[pos+2]);
LogPrintf(LogLCP, "%s%s\n", request, desc);
if (mode_type == MODE_REQ) {
reqreject:
if (length > sizeof RejBuff - (rejp - RejBuff)) {
length = sizeof RejBuff - (rejp - RejBuff);
LogPrintf(LogLCP, "Can't REJ length %d - trunating to %d\n",
cp[1], length);
}
memcpy(rejp, cp, length);
rejp += length;
LcpInfo.my_reject |= (1 << type);
if (length != cp[1])
return;
}
break;
}
/* to avoid inf. loop */
if (length == 0) {
LogPrintf(LogLCP, "LCP size zero\n");
break;
}
plen -= length;
cp += length;
}
}
void
LcpInput(struct mbuf * bp)
{
FsmInput(&LcpFsm, bp);
}
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