657 lines
15 KiB
C
657 lines
15 KiB
C
/*
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* PPP Link Control Protocol (LCP) Module
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*
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* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
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*
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* Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the Internet Initiative Japan, Inc. The name of the
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* IIJ may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $Id:$
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*
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* TODO:
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* o Validate magic number received from peer.
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* o Limit data field length by MRU
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*/
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#if __FreeBSD__ >=2
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#include <sys/time.h>
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#endif
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#include "fsm.h"
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#include "lcp.h"
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#include "ipcp.h"
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#include "lcpproto.h"
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#include "os.h"
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#include "hdlc.h"
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#include "lqr.h"
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#include "phase.h"
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#include "vars.h"
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extern void IpcpUp();
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extern void IpcpOpen();
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extern void SendPapChallenge();
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extern void SendChapChallenge();
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extern void SetLinkParams(struct lcpstate *);
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extern void Prompt();
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extern void StopIdleTimer();
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extern void HdlcInit();
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extern void OsLinkdown();
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extern void Cleanup();
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struct lcpstate LcpInfo;
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static void LcpSendConfigReq(struct fsm *);
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static void LcpSendTerminateReq(struct fsm *fp);
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static void LcpSendTerminateAck(struct fsm *fp);
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static void LcpDecodeConfig(struct mbuf *bp, int mode);
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static void LcpInitRestartCounter(struct fsm *);
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static void LcpLayerUp(struct fsm *);
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static void LcpLayerDown(struct fsm *);
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static void LcpLayerStart(struct fsm *);
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static void LcpLayerFinish(struct fsm *);
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extern int ModemSpeed();
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#define REJECTED(p, x) (p->his_reject & (1<<x))
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static char *cftypes[] = {
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"???", "MRU", "ACCMAP", "AUTHPROTO", "QUALPROTO", "MAGICNUM",
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"RESERVED", "PROTOCOMP", "ACFCOMP", "FCSALT", "SDP",
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};
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struct fsm LcpFsm = {
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"LCP", /* Name of protocol */
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PROTO_LCP, /* Protocol Number */
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LCP_MAXCODE,
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OPEN_ACTIVE,
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ST_INITIAL, /* State of machine */
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0, 0, 0,
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0,
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{ 0, 0, 0, NULL, NULL, NULL },
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LcpLayerUp,
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LcpLayerDown,
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LcpLayerStart,
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LcpLayerFinish,
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LcpInitRestartCounter,
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LcpSendConfigReq,
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LcpSendTerminateReq,
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LcpSendTerminateAck,
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LcpDecodeConfig,
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};
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static struct pppTimer LcpReportTimer;
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char *PhaseNames[] = {
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"Dead", "Establish", "Authenticate", "Network", "Terminate"
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};
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void
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NewPhase(new)
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int new;
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{
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struct lcpstate *lcp = &LcpInfo;
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phase = new;
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LogPrintf(LOG_PHASE, "Phase: %s\n", PhaseNames[phase]);
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switch (phase) {
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case PHASE_AUTHENTICATE:
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lcp->auth_ineed = lcp->want_auth;
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lcp->auth_iwait = lcp->his_auth;
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LogPrintf(LOG_PHASE, " his = %x, mine = %x\n", lcp->his_auth, lcp->want_auth);
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if (lcp->his_auth || lcp->want_auth) {
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if (lcp->his_auth == PROTO_PAP)
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SendPapChallenge();
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if (lcp->want_auth == PROTO_CHAP)
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SendChapChallenge();
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} else
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NewPhase(PHASE_NETWORK);
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break;
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case PHASE_NETWORK:
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IpcpUp();
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IpcpOpen();
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CcpUp();
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CcpOpen();
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break;
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case PHASE_DEAD:
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if (mode & MODE_DIRECT)
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Cleanup(EX_DEAD);
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break;
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}
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}
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static void
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LcpReportTime()
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{
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#ifdef VERBOSE
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time_t t;
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time(&t);
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logprintf("%s", ctime(&t));
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#endif
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StopTimer(&LcpReportTimer);
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LcpReportTimer.state = TIMER_STOPPED;
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StartTimer(&LcpReportTimer);
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HdlcErrorCheck();
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}
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int
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ReportLcpStatus()
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{
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struct lcpstate *lcp = &LcpInfo;
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struct fsm *fp = &LcpFsm;
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printf("%s [%s]\n", fp->name, StateNames[fp->state]);
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printf(
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" his side: MRU %d, ACCMAP %08x, PROTOCOMP %d, ACFCOMP %d MAGIC %08x\n",
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lcp->his_mru, lcp->his_accmap, lcp->his_protocomp, lcp->his_acfcomp, lcp->his_magic);
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printf(
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" my side: MRU %d, ACCMAP %08x, PROTOCOMP %d, ACFCOMP %d MAGIC %08x\n",
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lcp->want_mru, lcp->want_accmap, lcp->want_protocomp, lcp->want_acfcomp, lcp->want_magic);
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printf("\nDefaults: MRU = %d, ACCMAP = %08x\t", VarMRU, VarAccmap);
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printf("Open Mode: %s\n", (VarOpenMode == OPEN_ACTIVE)? "active" : "passive");
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return(1);
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}
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/*
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* Generate random number which will be used as magic number.
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*/
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u_long
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GenerateMagic()
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{
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time_t tl;
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struct timeval tval;
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time(&tl);
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gettimeofday(&tval, NULL);
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tl += tval.tv_sec ^ tval.tv_usec + getppid();
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tl *= getpid();
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return(tl);
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}
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void
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LcpInit()
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{
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struct lcpstate *lcp = &LcpInfo;
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FsmInit(&LcpFsm);
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HdlcInit();
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bzero(lcp, sizeof(struct lcpstate));
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lcp->want_mru = VarMRU;
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lcp->his_mru = DEF_MRU;
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lcp->his_accmap = 0xffffffff;
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lcp->want_accmap = VarAccmap;
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lcp->want_magic = GenerateMagic();
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lcp->want_auth = lcp->his_auth = 0;
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if (Enabled(ConfChap))
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lcp->want_auth = PROTO_CHAP;
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else if (Enabled(ConfPap))
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lcp->want_auth = PROTO_PAP;
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if (Enabled(ConfLqr)) lcp->want_lqrperiod = VarLqrTimeout * 100;
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if (Enabled(ConfAcfcomp)) lcp->want_acfcomp = 1;
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if (Enabled(ConfProtocomp)) lcp->want_protocomp = 1;
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LcpFsm.maxconfig = 10;
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}
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static void
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LcpInitRestartCounter(fp)
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struct fsm *fp;
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{
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fp->FsmTimer.load = 5 * SECTICKS;
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fp->restart = 5;
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}
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void
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PutConfValue(cpp, types, type, len, val)
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u_char **cpp;
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char **types;
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u_char type;
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int len;
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u_long val;
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{
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u_char *cp;
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cp = *cpp;
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*cp++ = type; *cp++ = len;
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if (len == 6) {
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if (type == TY_IPADDR) {
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LogPrintf(LOG_LCP, " %s [%d] %s\n",
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types[type], len, inet_ntoa(htonl(val)));
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} else {
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LogPrintf(LOG_LCP, " %s [%d] %08x\n", types[type], len, val);
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}
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*cp++ = (val >> 24) & 0377;
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*cp++ = (val >> 16) & 0377;
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} else
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LogPrintf(LOG_LCP, " %s [%d] %d\n", types[type], len, val);
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*cp++ = (val >> 8) & 0377;
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*cp++ = val & 0377;
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*cpp = cp;
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}
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static void
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LcpSendConfigReq(fp)
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struct fsm *fp;
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{
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u_char *cp;
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struct lcpstate *lcp = &LcpInfo;
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struct lqrreq *req;
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LogPrintf(LOG_LCP, "%s: SendConfigReq\n", fp->name);
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cp = ReqBuff;
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if (lcp->want_acfcomp && !REJECTED(lcp, TY_ACFCOMP)) {
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*cp++ = TY_ACFCOMP; *cp++ = 2;
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LogPrintf(LOG_LCP, " %s\n", cftypes[TY_ACFCOMP]);
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}
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if (lcp->want_protocomp && !REJECTED(lcp, TY_PROTOCOMP)) {
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*cp++ = TY_PROTOCOMP; *cp++ = 2;
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LogPrintf(LOG_LCP, " %s\n", cftypes[TY_PROTOCOMP]);
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}
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if (!REJECTED(lcp, TY_MRU))
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PutConfValue(&cp, cftypes, TY_MRU, 4, lcp->want_mru);
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if (!REJECTED(lcp, TY_ACCMAP))
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PutConfValue(&cp, cftypes, TY_ACCMAP, 6, lcp->want_accmap);
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if (lcp->want_magic && !REJECTED(lcp, TY_MAGICNUM))
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PutConfValue(&cp, cftypes, TY_MAGICNUM, 6, lcp->want_magic);
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if (lcp->want_lqrperiod && !REJECTED(lcp, TY_QUALPROTO)) {
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req = (struct lqrreq *)cp;
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req->type = TY_QUALPROTO; req->length = sizeof(struct lqrreq);
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req->proto = htons(PROTO_LQR);
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req->period = htonl(lcp->want_lqrperiod);
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cp += sizeof(struct lqrreq);
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LogPrintf(LOG_LCP, " %s (%d)\n", cftypes[TY_QUALPROTO], lcp->want_lqrperiod);
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}
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switch (lcp->want_auth) {
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case PROTO_PAP:
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PutConfValue(&cp, cftypes, TY_AUTHPROTO, 4, lcp->want_auth);
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break;
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case PROTO_CHAP:
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PutConfValue(&cp, cftypes, TY_AUTHPROTO, 5, lcp->want_auth);
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*cp++ = 5; /* Use MD5 */
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break;
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}
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FsmOutput(fp, CODE_CONFIGREQ, fp->reqid++, ReqBuff, cp - ReqBuff);
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}
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void
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LcpSendProtoRej(option, count)
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u_char *option;
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int count;
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{
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struct fsm *fp = &LcpFsm;
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LogPrintf(LOG_LCP, "%s: SendProtoRej\n", fp->name);
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FsmOutput(fp, CODE_PROTOREJ, fp->reqid, option, count);
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}
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static void
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LcpSendTerminateReq(fp)
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struct fsm *fp;
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{
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/* Most thins are done in fsm layer. Nothing to to. */
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}
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static void
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LcpSendTerminateAck(fp)
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struct fsm *fp;
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{
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LogPrintf(LOG_LCP, "%s: SendTerminateAck.\n", fp->name);
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FsmOutput(fp, CODE_TERMACK, fp->reqid++, NULL, 0);
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}
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static void
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LcpLayerStart(fp)
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struct fsm *fp;
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{
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LogPrintf(LOG_LCP, "%s: LayerStart\n", fp->name);
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NewPhase(PHASE_ESTABLISH);
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}
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static void
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LcpLayerFinish(fp)
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struct fsm *fp;
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{
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#ifdef VERBOSE
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fprintf(stderr, "%s: LayerFinish\r\n", fp->name);
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#endif
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Prompt(1);
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LogPrintf(LOG_LCP, "%s: LayerFinish\n", fp->name);
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#ifdef notdef
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OsCloseLink(0);
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#else
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OsCloseLink(1);
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#endif
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NewPhase(PHASE_DEAD);
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StopTimer(&LcpReportTimer);
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StopIdleTimer();
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OsInterfaceDown(0);
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}
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static void
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LcpLayerUp(fp)
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struct fsm *fp;
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{
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LogPrintf(LOG_LCP, "%s: LayerUp\n", fp->name);
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OsSetInterfaceParams(23, LcpInfo.his_mru, ModemSpeed());
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SetLinkParams(&LcpInfo);
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NewPhase(PHASE_AUTHENTICATE);
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StartLqm();
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StopTimer(&LcpReportTimer);
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LcpReportTimer.state = TIMER_STOPPED;
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LcpReportTimer.load = 60 * SECTICKS;
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LcpReportTimer.func = LcpReportTime;
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StartTimer(&LcpReportTimer);
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}
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static void
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LcpLayerDown(fp)
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struct fsm *fp;
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{
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LogPrintf(LOG_LCP, "%s: LayerDown\n", fp->name);
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OsLinkdown();
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NewPhase(PHASE_TERMINATE);
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}
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void
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LcpUp()
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{
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FsmUp(&LcpFsm);
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}
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void
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LcpDown()
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{
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NewPhase(PHASE_DEAD);
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FsmDown(&LcpFsm);
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}
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void
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LcpOpen(mode)
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int mode;
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{
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LcpFsm.open_mode = mode;
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FsmOpen(&LcpFsm);
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}
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void
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LcpClose()
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{
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FsmClose(&LcpFsm);
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}
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/*
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* XXX: Should validate option length
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*/
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static void
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LcpDecodeConfig(bp, mode)
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struct mbuf *bp;
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int mode;
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{
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u_char *cp;
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char *request;
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int plen, type, length, mru;
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u_long *lp, magic, accmap;
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u_short *sp, proto;
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struct lqrreq *req;
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plen = plength(bp);
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cp = MBUF_CTOP(bp);
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ackp = AckBuff;
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nakp = NakBuff;
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rejp = RejBuff;
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while (plen >= sizeof(struct fsmconfig)) {
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type = *cp;
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length = cp[1];
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if (type <= TY_ACFCOMP)
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request = cftypes[type];
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else
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request = "???";
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switch (type) {
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case TY_MRU:
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sp = (u_short *)(cp + 2);
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mru = htons(*sp);
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LogPrintf(LOG_LCP, " %s %d\n", request, mru);
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switch (mode) {
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case MODE_REQ:
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if (mru > MAX_MRU) {
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*sp = htons(MAX_MRU);
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bcopy(cp, nakp, 4); nakp += 4;
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} else if (mru < MIN_MRU) {
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*sp = htons(MIN_MRU);
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bcopy(cp, nakp, 4); nakp += 4;
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} else {
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LcpInfo.his_mru = mru;
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bcopy(cp, ackp, 4); ackp += 4;
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}
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break;
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case MODE_NAK:
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if (mru >= MIN_MRU || mru <= MAX_MRU)
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LcpInfo.want_mru = mru;
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break;
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case MODE_REJ:
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LcpInfo.his_reject |= (1 << type);
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break;
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}
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break;
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case TY_ACCMAP:
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lp = (u_long *)(cp + 2);
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accmap = htonl(*lp);
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LogPrintf(LOG_LCP, " %s %08x\n", request, accmap);
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switch (mode) {
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case MODE_REQ:
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LcpInfo.his_accmap = accmap;
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bcopy(cp, ackp, 6); ackp += 6;
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break;
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case MODE_NAK:
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LcpInfo.want_accmap = accmap;
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break;
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case MODE_REJ:
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LcpInfo.his_reject |= (1 << type);
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break;
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}
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break;
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case TY_AUTHPROTO:
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sp = (u_short *)(cp + 2);
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proto = ntohs(*sp);
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LogPrintf(LOG_LCP, " %s proto = %x\n", request, proto);
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switch (mode) {
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case MODE_REQ:
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switch (proto) {
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case PROTO_PAP:
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if (length != 4) {
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LogPrintf(LOG_LCP, " %s bad length (%d)\n", request, length);
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goto reqreject;
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}
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if (Acceptable(ConfPap)) {
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LcpInfo.his_auth = proto;
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bcopy(cp, ackp, length); ackp += length;
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} else if (Acceptable(ConfChap)) {
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*nakp++ = *cp; *nakp++ = 5;
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*nakp++ = (unsigned char)PROTO_CHAP >> 8;
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*nakp++ = (unsigned char)PROTO_CHAP;
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*nakp++ = 5;
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} else
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goto reqreject;
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break;
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case PROTO_CHAP:
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if (length < 5) {
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LogPrintf(LOG_LCP, " %s bad length (%d)\n", request, length);
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goto reqreject;
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}
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if (Acceptable(ConfChap) && cp[4] == 5) {
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LcpInfo.his_auth = proto;
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bcopy(cp, ackp, length); ackp += length;
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} else if (Acceptable(ConfPap)) {
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*nakp++ = *cp; *nakp++ = 4;
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*nakp++ = (unsigned char)PROTO_PAP >> 8;
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*nakp++ = (unsigned char)PROTO_PAP;
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} else
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goto reqreject;
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break;
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default:
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LogPrintf(LOG_LCP, " %s not implemented.\n", request);
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goto reqreject;
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}
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break;
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case MODE_NAK:
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break;
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case MODE_REJ:
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LcpInfo.his_reject |= (1 << type);
|
|
break;
|
|
}
|
|
break;
|
|
case TY_QUALPROTO:
|
|
req = (struct lqrreq *)cp;
|
|
LogPrintf(LOG_LCP, " %s proto: %x, interval: %dms\n",
|
|
request, ntohs(req->proto), ntohl(req->period)*10);
|
|
switch (mode) {
|
|
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);
|
|
bcopy(cp, ackp, 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(LOG_LCP, " %s %08x\n", request, magic);
|
|
|
|
switch (mode) {
|
|
case MODE_REQ:
|
|
if (LcpInfo.want_magic) {
|
|
/* XXX: Shoud validate magic number */
|
|
if (magic == LcpInfo.want_magic)
|
|
logprintf("magic is same!! %x, %x, %x\n",
|
|
magic, LcpInfo.want_magic, LcpInfo.his_magic);
|
|
LcpInfo.his_magic = magic;
|
|
bcopy(cp, ackp, length); ackp += length;
|
|
} else {
|
|
LcpInfo.my_reject |= (1 << type);
|
|
goto reqreject;
|
|
}
|
|
break;
|
|
case MODE_NAK:
|
|
LogPrintf(LOG_LCP, " %s magic %08x has NAKed\n", request, magic);
|
|
LcpInfo.want_magic = GenerateMagic();
|
|
break;
|
|
case MODE_REJ:
|
|
LogPrintf(LOG_LCP, " %s magic has REJected\n", request);
|
|
LcpInfo.want_magic = 0;
|
|
LcpInfo.his_reject |= (1 << type);
|
|
break;
|
|
}
|
|
break;
|
|
case TY_PROTOCOMP:
|
|
LogPrintf(LOG_LCP, " %s\n", request);
|
|
|
|
switch (mode) {
|
|
case MODE_REQ:
|
|
if (Acceptable(ConfProtocomp)) {
|
|
LcpInfo.his_protocomp = 1;
|
|
bcopy(cp, ackp, 2); ackp += 2;
|
|
} else {
|
|
#ifdef OLDMST
|
|
/*
|
|
* MorningStar before v1.3 needs NAK
|
|
*/
|
|
bcopy(cp, nakp, 2); nakp += 2;
|
|
#else
|
|
bcopy(cp, rejp, 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(LOG_LCP, " %s\n", request);
|
|
switch (mode) {
|
|
case MODE_REQ:
|
|
if (Acceptable(ConfAcfcomp)) {
|
|
LcpInfo.his_acfcomp = 1;
|
|
bcopy(cp, ackp, 2);
|
|
ackp += 2;
|
|
} else {
|
|
#ifdef OLDMST
|
|
/*
|
|
* MorningStar before v1.3 needs NAK
|
|
*/
|
|
bcopy(cp, nakp, 2);
|
|
nakp += 2;
|
|
#else
|
|
bcopy(cp, rejp, 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(LOG_LCP, " %s\n", request);
|
|
switch (mode) {
|
|
case MODE_REQ:
|
|
case MODE_NAK:
|
|
case MODE_REJ:
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
reqreject:
|
|
bcopy(cp, rejp, length);
|
|
rejp += length;
|
|
LcpInfo.my_reject |= (1 << type);
|
|
break;
|
|
}
|
|
plen -= length;
|
|
cp += length;
|
|
}
|
|
}
|
|
|
|
void
|
|
LcpInput(struct mbuf *bp)
|
|
{
|
|
FsmInput(&LcpFsm, bp);
|
|
}
|