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freebsd-src/usr.sbin/ppp/lcp.c
Brian Somers 1fa665f5b3 o Add the link name to modem diagnostics. 
o Create struct mpserver as part of struct mp.
  mpserver creates a unix-domain socket based on the
  peers auth name and endpoint discriminator.  If it
  already exists, ppp will ``pass the link'' over to
  the owner of the socket, joining it into the bundle
  of another ppp invocation, otherwise ppp waits for
  other invocations to pass it links through this
  socket.
  The final piece of code will be the code that flattens
  our datalink info and passes it down this channel
  (not yet implemented).
1998-04-28 01:25:46 +00:00

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/*
* 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 1.55.2.49 1998/04/25 10:49:12 brian Exp $
*
* TODO:
* o Limit data field length by MRU
*/
#include <sys/types.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <sys/un.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.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 "iplist.h"
#include "lcp.h"
#include "throughput.h"
#include "lcpproto.h"
#include "descriptor.h"
#include "lqr.h"
#include "hdlc.h"
#include "ccp.h"
#include "async.h"
#include "link.h"
#include "physical.h"
#include "prompt.h"
#include "slcompress.h"
#include "ipcp.h"
#include "filter.h"
#include "mp.h"
#include "chat.h"
#include "auth.h"
#include "chap.h"
#include "datalink.h"
#include "bundle.h"
/* for received LQRs */
struct lqrreq {
u_char type;
u_char length;
u_short proto; /* Quality protocol */
u_long period; /* Reporting interval */
};
static void LcpLayerUp(struct fsm *);
static void LcpLayerDown(struct fsm *);
static void LcpLayerStart(struct fsm *);
static void LcpLayerFinish(struct fsm *);
static void LcpInitRestartCounter(struct fsm *);
static void LcpSendConfigReq(struct fsm *);
static void LcpSentTerminateReq(struct fsm *);
static void LcpSendTerminateAck(struct fsm *, u_char);
static void LcpDecodeConfig(struct fsm *, u_char *, int, int,
struct fsm_decode *);
static struct fsm_callbacks lcp_Callbacks = {
LcpLayerUp,
LcpLayerDown,
LcpLayerStart,
LcpLayerFinish,
LcpInitRestartCounter,
LcpSendConfigReq,
LcpSentTerminateReq,
LcpSendTerminateAck,
LcpDecodeConfig,
NullRecvResetReq,
NullRecvResetAck
};
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 */
"MRRU", /* 17: Multilink-MRRU */
"SHORTSEQ", /* 18: Multilink-Short-Sequence-Number-Header */
"ENDDISC", /* 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])
int
lcp_ReportStatus(struct cmdargs const *arg)
{
struct link *l = ChooseLink(arg);
struct lcp *lcp = &l->lcp;
prompt_Printf(arg->prompt, "%s: %s [%s]\n", l->name, lcp->fsm.name,
State2Nam(lcp->fsm.state));
prompt_Printf(arg->prompt,
" his side: MRU %d, ACCMAP %08lx, PROTOCOMP %s, ACFCOMP %s,\n"
" MAGIC %08lx, MRRU %u, SHORTSEQ %s, REJECT %04x\n",
lcp->his_mru, (u_long)lcp->his_accmap,
lcp->his_protocomp ? "on" : "off",
lcp->his_acfcomp ? "on" : "off",
(u_long)lcp->his_magic, lcp->his_mrru,
lcp->his_shortseq ? "on" : "off", lcp->his_reject);
prompt_Printf(arg->prompt,
" my side: MRU %d, ACCMAP %08lx, PROTOCOMP %s, ACFCOMP %s,\n"
" MAGIC %08lx, MRRU %u, SHORTSEQ %s, REJECT %04x\n",
lcp->want_mru, (u_long)lcp->want_accmap,
lcp->want_protocomp ? "on" : "off",
lcp->want_acfcomp ? "on" : "off",
(u_long)lcp->want_magic, lcp->want_mrru,
lcp->want_shortseq ? "on" : "off", lcp->my_reject);
prompt_Printf(arg->prompt, "\n Defaults: MRU = %d, ", lcp->cfg.mru);
prompt_Printf(arg->prompt, "ACCMAP = %08lx\n", (u_long)lcp->cfg.accmap);
prompt_Printf(arg->prompt, " LQR period = %us, ",
lcp->cfg.lqrperiod);
prompt_Printf(arg->prompt, "Open Mode = %s",
lcp->cfg.openmode == OPEN_PASSIVE ? "passive" : "active");
if (lcp->cfg.openmode > 0)
prompt_Printf(arg->prompt, " (delay %ds)", lcp->cfg.openmode);
prompt_Printf(arg->prompt, "\n FSM retry = %us\n",
lcp->cfg.fsmretry);
prompt_Printf(arg->prompt, "\n Negotiation:\n");
prompt_Printf(arg->prompt, " ACFCOMP = %s\n",
command_ShowNegval(lcp->cfg.acfcomp));
prompt_Printf(arg->prompt, " CHAP = %s\n",
command_ShowNegval(lcp->cfg.chap));
prompt_Printf(arg->prompt, " LQR = %s\n",
command_ShowNegval(lcp->cfg.lqr));
prompt_Printf(arg->prompt, " PAP = %s\n",
command_ShowNegval(lcp->cfg.pap));
prompt_Printf(arg->prompt, " PROTOCOMP = %s\n",
command_ShowNegval(lcp->cfg.protocomp));
return 0;
}
static u_int32_t
GenerateMagic(void)
{
/* Generate random number which will be used as magic number */
randinit();
return random();
}
void
lcp_Init(struct lcp *lcp, struct bundle *bundle, struct link *l,
const struct fsm_parent *parent)
{
/* Initialise ourselves */
int mincode = parent ? 1 : LCP_MINMPCODE;
static const char *timer_names[] =
{"LCP restart", "LCP openmode", "LCP stopped"};
fsm_Init(&lcp->fsm, "LCP", PROTO_LCP, mincode, LCP_MAXCODE, 10, LogLCP,
bundle, l, parent, &lcp_Callbacks, timer_names);
lcp->cfg.mru = DEF_MRU;
lcp->cfg.accmap = 0;
lcp->cfg.openmode = 1;
lcp->cfg.lqrperiod = DEF_LQRPERIOD;
lcp->cfg.fsmretry = DEF_FSMRETRY;
lcp->cfg.acfcomp = NEG_ENABLED|NEG_ACCEPTED;
lcp->cfg.chap = NEG_ACCEPTED;
lcp->cfg.lqr = NEG_ACCEPTED;
lcp->cfg.pap = NEG_ACCEPTED;
lcp->cfg.protocomp = NEG_ENABLED|NEG_ACCEPTED;
lcp_Setup(lcp, lcp->cfg.openmode);
}
void
lcp_Setup(struct lcp *lcp, int openmode)
{
lcp->fsm.open_mode = openmode;
lcp->fsm.maxconfig = 10;
lcp->his_mru = DEF_MRU;
lcp->his_mrru = 0;
lcp->his_magic = 0;
lcp->his_lqrperiod = 0;
lcp->his_acfcomp = 0;
lcp->his_auth = 0;
lcp->his_shortseq = 0;
lcp->want_mru = lcp->cfg.mru;
lcp->want_mrru = lcp->fsm.bundle->ncp.mp.cfg.mrru;
lcp->want_shortseq = IsEnabled(lcp->fsm.bundle->ncp.mp.cfg.shortseq) ? 1 : 0;
lcp->want_acfcomp = IsEnabled(lcp->cfg.acfcomp) ? 1 : 0;
if (lcp->fsm.parent) {
lcp->his_accmap = 0xffffffff;
lcp->want_accmap = lcp->cfg.accmap;
lcp->his_protocomp = 0;
lcp->want_protocomp = IsEnabled(lcp->cfg.protocomp) ? 1 : 0;
lcp->want_magic = GenerateMagic();
lcp->want_auth = IsEnabled(lcp->cfg.chap) ? PROTO_CHAP :
IsEnabled(lcp->cfg.pap) ? PROTO_PAP : 0;
lcp->want_lqrperiod = IsEnabled(lcp->cfg.lqr) ?
lcp->cfg.lqrperiod * 100 : 0;
} else {
lcp->his_accmap = lcp->want_accmap = 0;
lcp->his_protocomp = lcp->want_protocomp = 1;
lcp->want_magic = 0;
lcp->want_auth = 0;
lcp->want_lqrperiod = 0;
}
lcp->his_reject = lcp->my_reject = 0;
lcp->auth_iwait = lcp->auth_ineed = 0;
lcp->LcpFailedMagic = 0;
}
static void
LcpInitRestartCounter(struct fsm * fp)
{
/* Set fsm timer load */
struct lcp *lcp = fsm2lcp(fp);
fp->FsmTimer.load = lcp->cfg.fsmretry * SECTICKS;
fp->restart = 5;
}
static void
LcpSendConfigReq(struct fsm *fp)
{
/* Send config REQ please */
struct physical *p = link2physical(fp->link);
struct lcp *lcp = fsm2lcp(fp);
u_char buff[200];
struct lcp_opt *o;
struct mp *mp;
if (!p) {
LogPrintf(LogERROR, "%s: LcpSendConfigReq: Not a physical link !\n",
fp->link->name);
return;
}
o = (struct lcp_opt *)buff;
if (!Physical_IsSync(p)) {
if (lcp->want_acfcomp && !REJECTED(lcp, TY_ACFCOMP))
INC_LCP_OPT(TY_ACFCOMP, 2, o);
if (lcp->want_protocomp && !REJECTED(lcp, TY_PROTOCOMP))
INC_LCP_OPT(TY_PROTOCOMP, 2, o);
if (!REJECTED(lcp, TY_ACCMAP)) {
*(u_int32_t *)o->data = htonl(lcp->want_accmap);
INC_LCP_OPT(TY_ACCMAP, 6, o);
}
}
if (!REJECTED(lcp, TY_MRU)) {
*(u_short *)o->data = htons(lcp->want_mru);
INC_LCP_OPT(TY_MRU, 4, o);
}
if (lcp->want_magic && !REJECTED(lcp, TY_MAGICNUM)) {
*(u_int32_t *)o->data = htonl(lcp->want_magic);
INC_LCP_OPT(TY_MAGICNUM, 6, o);
}
if (lcp->want_lqrperiod && !REJECTED(lcp, TY_QUALPROTO)) {
*(u_short *)o->data = htons(PROTO_LQR);
*(u_long *)(o->data + 2) = htonl(lcp->want_lqrperiod);
INC_LCP_OPT(TY_QUALPROTO, 8, o);
}
switch (lcp->want_auth) {
case PROTO_PAP:
*(u_short *)o->data = htons(PROTO_PAP);
INC_LCP_OPT(TY_AUTHPROTO, 4, o);
break;
case PROTO_CHAP:
*(u_short *)o->data = htons(PROTO_CHAP);
o->data[2] = 0x05;
INC_LCP_OPT(TY_AUTHPROTO, 5, o);
break;
}
if (lcp->want_mrru && !REJECTED(lcp, TY_MRRU)) {
*(u_short *)o->data = htons(lcp->want_mrru);
INC_LCP_OPT(TY_MRRU, 4, o);
if (lcp->want_shortseq && !REJECTED(lcp, TY_SHORTSEQ))
INC_LCP_OPT(TY_SHORTSEQ, 2, o);
}
mp = &lcp->fsm.bundle->ncp.mp;
if (mp->cfg.enddisc.class != 0 && !REJECTED(lcp, TY_ENDDISC)) {
*o->data = mp->cfg.enddisc.class;
memcpy(o->data+1, mp->cfg.enddisc.address, mp->cfg.enddisc.len);
INC_LCP_OPT(TY_ENDDISC, mp->cfg.enddisc.len + 3, o);
}
FsmOutput(fp, CODE_CONFIGREQ, fp->reqid, buff, (u_char *)o - buff);
}
void
lcp_SendProtoRej(struct lcp *lcp, u_char *option, int count)
{
/* Don't understand `option' */
FsmOutput(&lcp->fsm, CODE_PROTOREJ, lcp->fsm.reqid, option, count);
}
static void
LcpSentTerminateReq(struct fsm * fp)
{
/* Term REQ just sent by FSM */
}
static void
LcpSendTerminateAck(struct fsm *fp, u_char id)
{
/* Send Term ACK please */
FsmOutput(fp, CODE_TERMACK, id, NULL, 0);
}
static void
LcpLayerStart(struct fsm *fp)
{
/* We're about to start up ! */
struct lcp *lcp = fsm2lcp(fp);
LogPrintf(LogLCP, "%s: LcpLayerStart\n", fp->link->name);
lcp->LcpFailedMagic = 0;
}
static void
LcpLayerFinish(struct fsm *fp)
{
/* We're now down */
LogPrintf(LogLCP, "%s: LcpLayerFinish\n", fp->link->name);
}
static void
LcpLayerUp(struct fsm *fp)
{
/* We're now up */
struct physical *p = link2physical(fp->link);
struct lcp *lcp = fsm2lcp(fp);
LogPrintf(LogLCP, "%s: LcpLayerUp\n", fp->link->name);
async_SetLinkParams(&p->async, lcp);
StartLqm(lcp);
hdlc_StartTimer(&p->hdlc);
}
static void
LcpLayerDown(struct fsm *fp)
{
/* About to come down */
struct physical *p = link2physical(fp->link);
LogPrintf(LogLCP, "%s: LcpLayerDown\n", fp->link->name);
hdlc_StopTimer(&p->hdlc);
StopLqrTimer(p);
}
static void
LcpDecodeConfig(struct fsm *fp, u_char *cp, int plen, int mode_type,
struct fsm_decode *dec)
{
/* Deal with incoming PROTO_LCP */
struct lcp *lcp = fsm2lcp(fp);
int type, length, sz, pos;
u_int32_t magic, accmap;
u_short mtu, mru, *sp, proto;
struct lqrreq *req;
char request[20], desc[22];
struct mp *mp;
struct physical *p = link2physical(fp->link);
while (plen >= sizeof(struct fsmconfig)) {
type = *cp;
length = cp[1];
if (length == 0) {
LogPrintf(LogLCP, "%s: LCP size zero\n", fp->link->name);
break;
}
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_MRRU:
mp = &lcp->fsm.bundle->ncp.mp;
sp = (u_short *)(cp + 2);
mru = htons(*sp);
LogPrintf(LogLCP, "%s %u\n", request, mru);
switch (mode_type) {
case MODE_REQ:
if (mp->cfg.mrru) {
if (REJECTED(lcp, TY_MRRU))
/* Ignore his previous reject so that we REQ next time */
lcp->his_reject &= ~(1 << type);
mtu = lcp->fsm.bundle->cfg.mtu;
if (mru < MIN_MRU || mru < mtu) {
/* Push him up to MTU or MIN_MRU */
lcp->his_mrru = mru < mtu ? mtu : MIN_MRU;
*sp = htons((u_short)lcp->his_mrru);
memcpy(dec->nakend, cp, 4);
dec->nakend += 4;
} else {
lcp->his_mrru = mtu ? mtu : mru;
memcpy(dec->ackend, cp, 4);
dec->ackend += 4;
}
break;
} else
goto reqreject;
break;
case MODE_NAK:
if (mp->cfg.mrru) {
if (REJECTED(lcp, TY_MRRU))
/* Must have changed his mind ! */
lcp->his_reject &= ~(1 << type);
if (mru > MAX_MRU)
lcp->want_mrru = MAX_MRU;
else if (mru < MIN_MRU)
lcp->want_mrru = MIN_MRU;
else
lcp->want_mrru = mru;
}
/* else we honour our config and don't send the suggested REQ */
break;
case MODE_REJ:
lcp->his_reject |= (1 << type);
lcp->want_mrru = 0; /* Ah well, no multilink :-( */
break;
}
break;
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 = lcp->fsm.bundle->cfg.mtu;
if (mru < MIN_MRU || (!lcp->want_mrru && mru < mtu)) {
/* Push him up to MTU or MIN_MRU */
lcp->his_mru = mru < mtu ? mtu : MIN_MRU;
*sp = htons((u_short)lcp->his_mru);
memcpy(dec->nakend, cp, 4);
dec->nakend += 4;
} else {
lcp->his_mru = mtu ? mtu : mru;
memcpy(dec->ackend, cp, 4);
dec->ackend += 4;
}
break;
case MODE_NAK:
if (mru > MAX_MRU)
lcp->want_mru = MAX_MRU;
else if (mru < MIN_MRU)
lcp->want_mru = MIN_MRU;
else
lcp->want_mru = mru;
break;
case MODE_REJ:
lcp->his_reject |= (1 << type);
break;
}
break;
case TY_ACCMAP:
accmap = htonl(*(u_int32_t *)(cp + 2));
LogPrintf(LogLCP, "%s 0x%08lx\n", request, (u_long)accmap);
switch (mode_type) {
case MODE_REQ:
lcp->his_accmap = accmap;
memcpy(dec->ackend, cp, 6);
dec->ackend += 6;
break;
case MODE_NAK:
lcp->want_accmap = accmap;
break;
case MODE_REJ:
lcp->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 (IsAccepted(lcp->cfg.pap)) {
lcp->his_auth = proto;
memcpy(dec->ackend, cp, length);
dec->ackend += length;
} else if (IsAccepted(lcp->cfg.chap)) {
*dec->nakend++ = *cp;
*dec->nakend++ = 5;
*dec->nakend++ = (unsigned char) (PROTO_CHAP >> 8);
*dec->nakend++ = (unsigned char) PROTO_CHAP;
*dec->nakend++ = 0x05;
} else
goto reqreject;
break;
case PROTO_CHAP:
if (length < 5) {
LogPrintf(LogLCP, " Bad length!\n");
goto reqreject;
}
#ifdef HAVE_DES
if (IsAccepted(lcp->cfg.chap) && (cp[4] == 0x05 || cp[4] == 0x80))
#else
if (IsAccepted(lcp->cfg.chap) && cp[4] == 0x05)
#endif
{
lcp->his_auth = proto;
memcpy(dec->ackend, cp, length);
dec->ackend += length;
#ifdef HAVE_DES
link2physical(fp->link)->dl->chap.using_MSChap = cp[4] == 0x80;
#endif
} else if (IsAccepted(lcp->cfg.pap)) {
*dec->nakend++ = *cp;
*dec->nakend++ = 4;
*dec->nakend++ = (unsigned char) (PROTO_PAP >> 8);
*dec->nakend++ = (unsigned char) PROTO_PAP;
} else
goto reqreject;
break;
default:
LogPrintf(LogLCP, "%s 0x%04x - not recognised, NAK\n",
request, proto);
memcpy(dec->nakend, cp, length);
dec->nakend += length;
break;
}
break;
case MODE_NAK:
switch (proto) {
case PROTO_PAP:
if (IsEnabled(lcp->cfg.pap))
lcp->want_auth = PROTO_PAP;
else {
LogPrintf(LogLCP, "Peer will only send PAP (not enabled)\n");
lcp->his_reject |= (1 << type);
}
break;
case PROTO_CHAP:
if (IsEnabled(lcp->cfg.chap))
lcp->want_auth = PROTO_CHAP;
else {
LogPrintf(LogLCP, "Peer will only send CHAP (not enabled)\n");
lcp->his_reject |= (1 << type);
}
break;
default:
/* We've been NAK'd with something we don't understand :-( */
lcp->his_reject |= (1 << type);
break;
}
break;
case MODE_REJ:
lcp->his_reject |= (1 << type);
break;
}
break;
case TY_QUALPROTO:
req = (struct lqrreq *)cp;
LogPrintf(LogLCP, "%s proto %x, interval %ldms\n",
request, ntohs(req->proto), (long)ntohl(req->period) * 10);
switch (mode_type) {
case MODE_REQ:
if (ntohs(req->proto) != PROTO_LQR || !IsAccepted(lcp->cfg.lqr))
goto reqreject;
else {
lcp->his_lqrperiod = ntohl(req->period);
if (lcp->his_lqrperiod < 500)
lcp->his_lqrperiod = 500;
req->period = htonl(lcp->his_lqrperiod);
memcpy(dec->ackend, cp, length);
dec->ackend += length;
}
break;
case MODE_NAK:
break;
case MODE_REJ:
lcp->his_reject |= (1 << type);
break;
}
break;
case TY_MAGICNUM:
magic = ntohl(*(u_int32_t *)(cp + 2));
LogPrintf(LogLCP, "%s 0x%08lx\n", request, (u_long)magic);
switch (mode_type) {
case MODE_REQ:
if (lcp->want_magic) {
/* Validate magic number */
if (magic == lcp->want_magic) {
LogPrintf(LogLCP, "Magic is same (%08lx) - %d times\n",
(u_long)magic, ++lcp->LcpFailedMagic);
lcp->want_magic = GenerateMagic();
memcpy(dec->nakend, cp, 6);
dec->nakend += 6;
ualarm(TICKUNIT * (4 + 4 * lcp->LcpFailedMagic), 0);
sigpause(0);
} else {
lcp->his_magic = magic;
memcpy(dec->ackend, cp, length);
dec->ackend += length;
lcp->LcpFailedMagic = 0;
}
} else {
goto reqreject;
}
break;
case MODE_NAK:
LogPrintf(LogLCP, " Magic 0x%08lx is NAKed!\n", (u_long)magic);
lcp->want_magic = GenerateMagic();
break;
case MODE_REJ:
LogPrintf(LogLCP, " Magic 0x%08x is REJected!\n", magic);
lcp->want_magic = 0;
lcp->his_reject |= (1 << type);
break;
}
break;
case TY_PROTOCOMP:
LogPrintf(LogLCP, "%s\n", request);
switch (mode_type) {
case MODE_REQ:
if (IsAccepted(lcp->cfg.protocomp)) {
lcp->his_protocomp = 1;
memcpy(dec->ackend, cp, 2);
dec->ackend += 2;
} else {
#ifdef OLDMST
/*
* MorningStar before v1.3 needs NAK
*/
memcpy(dec->nakend, cp, 2);
dec->nakend += 2;
#else
goto reqreject;
#endif
}
break;
case MODE_NAK:
case MODE_REJ:
lcp->want_protocomp = 0;
lcp->his_reject |= (1 << type);
break;
}
break;
case TY_ACFCOMP:
LogPrintf(LogLCP, "%s\n", request);
switch (mode_type) {
case MODE_REQ:
if (IsAccepted(lcp->cfg.acfcomp)) {
lcp->his_acfcomp = 1;
memcpy(dec->ackend, cp, 2);
dec->ackend += 2;
} else {
#ifdef OLDMST
/*
* MorningStar before v1.3 needs NAK
*/
memcpy(dec->nakend, cp, 2);
dec->nakend += 2;
#else
goto reqreject;
#endif
}
break;
case MODE_NAK:
case MODE_REJ:
lcp->want_acfcomp = 0;
lcp->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;
case TY_SHORTSEQ:
mp = &lcp->fsm.bundle->ncp.mp;
LogPrintf(LogLCP, "%s\n", request);
switch (mode_type) {
case MODE_REQ:
if (lcp->want_mrru && IsAccepted(mp->cfg.shortseq)) {
lcp->his_shortseq = 1;
memcpy(dec->ackend, cp, length);
dec->ackend += length;
} else
goto reqreject;
break;
case MODE_NAK:
/*
* He's trying to get us to ask for short sequence numbers.
* We ignore the NAK and honour our configuration file instead.
*/
break;
case MODE_REJ:
lcp->his_reject |= (1 << type);
break;
}
break;
case TY_ENDDISC:
LogPrintf(LogLCP, "%s %s\n", request,
mp_Enddisc(cp[2], cp + 3, length - 3));
switch (mode_type) {
case MODE_REQ:
if (!p) {
LogPrintf(LogLCP, " ENDDISC rejected - not a physical link\n");
goto reqreject;
} else if (length-3 < sizeof p->dl->peer.enddisc.address &&
cp[2] <= MAX_ENDDISC_CLASS) {
p->dl->peer.enddisc.class = cp[2];
p->dl->peer.enddisc.len = length-3;
memcpy(p->dl->peer.enddisc.address, cp + 3, length - 3);
p->dl->peer.enddisc.address[length - 3] = '\0';
/* XXX: If mp->active, compare and NAK with mp->peer ? */
memcpy(dec->ackend, cp, length);
dec->ackend += length;
} else {
if (cp[2] > MAX_ENDDISC_CLASS)
LogPrintf(LogLCP, " ENDDISC rejected - unrecognised class %d\n",
cp[2]);
else
LogPrintf(LogLCP, " ENDDISC rejected - local max length is %d\n",
sizeof p->dl->peer.enddisc.address - 1);
goto reqreject;
}
break;
case MODE_NAK: /* Treat this as a REJ, we don't vary or disc */
case MODE_REJ:
lcp->his_reject |= (1 << type);
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 dec->rej - (dec->rejend - dec->rej)) {
length = sizeof dec->rej - (dec->rejend - dec->rej);
LogPrintf(LogLCP, "Can't REJ length %d - trunating to %d\n",
cp[1], length);
}
memcpy(dec->rejend, cp, length);
dec->rejend += length;
lcp->my_reject |= (1 << type);
if (length != cp[1])
length = 0; /* force our way out of the loop */
}
break;
}
plen -= length;
cp += length;
}
if (mode_type != MODE_NOP) {
if (dec->rejend != dec->rej) {
/* rejects are preferred */
dec->ackend = dec->ack;
dec->nakend = dec->nak;
} else if (dec->nakend != dec->nak)
/* then NAKs */
dec->ackend = dec->ack;
}
}
void
LcpInput(struct lcp *lcp, struct mbuf * bp)
{
/* Got PROTO_LCP from link */
FsmInput(&lcp->fsm, bp);
}
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