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freebsd-skq/usr.sbin/ppp/lcp.c
Brian Somers dbf60d74f8 o Don't go multilink if the peer hasn't asked for it 
o Don't go multilink if the peer hasn't agreed
o When negotiating multilink, don't try to push the peers
  MRU up according to our `set mtu' setting.  Instead, accept
  whatever MRU they want and push their MRRU up instead.
o When *not* negotiating multilink, REJ short sequence number
  REQs.
1998-04-23 18:55:50 +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 1.55.2.44 1998/04/23 03:22:55 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 <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 "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, "LcpSendConfigReq: Not a physical link !\n");
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, "LcpLayerStart\n");
lcp->LcpFailedMagic = 0;
}
static void
LcpLayerFinish(struct fsm *fp)
{
/* We're now down */
LogPrintf(LogLCP, "LcpLayerFinish\n");
}
static void
LcpLayerUp(struct fsm *fp)
{
/* We're now up */
struct physical *p = link2physical(fp->link);
struct lcp *lcp = fsm2lcp(fp);
LogPrintf(LogLCP, "LcpLayerUp\n");
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, "LcpLayerDown\n");
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;
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_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), 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 (length-3 < sizeof lcp->fsm.bundle->ncp.mp.peer_enddisc.address &&
cp[2] <= MAX_ENDDISC_CLASS) {
lcp->fsm.bundle->ncp.mp.peer_enddisc.class = cp[2];
lcp->fsm.bundle->ncp.mp.peer_enddisc.len = length-3;
memcpy(lcp->fsm.bundle->ncp.mp.peer_enddisc.address, cp+3, length-3);
lcp->fsm.bundle->ncp.mp.peer_enddisc.address[length-3] = '\0';
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 lcp->fsm.bundle->ncp.mp.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;
}
/* to avoid inf. loop */
if (length == 0) {
LogPrintf(LogLCP, "LCP size zero\n");
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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