lcp.c
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上传日期:2007-01-17
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- /* lcp.c - PPP Link Control Protocol */
- /* Copyright 1995 Wind River Systems, Inc. */
- #include "copyright_wrs.h"
- /*
- * Copyright (c) 1989 Carnegie Mellon University.
- * All rights reserved.
- *
- * 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 Carnegie Mellon University. The name of the
- * University 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.
- */
- /*
- modification history
- --------------------
- 01d,14apr97,vin lcp state machine fixes from ppp-2.3b3, corrected the
- problem of lcp_reqci generating CONFREJ instead of CONFNAKs.
- 01e,10dec96,vin fixed additional problem with lcp_finished(), SPR7604.
- 01d,15nov96,vin fixed lcp_finished(), calls fsm_open() if OPT_RESTART
- is specified. This will cause the ppp deamon task
- to wait for the next connection. This is typically useful
- when vxWorks target is acting as a ppp server.
- Added flag OPT_RESTART if passive or silent options are
- specified.
- 01c,16jun95,dzb header file consolidation.
- changed [UN]TIMEOUT macros to PPP_[UN]TIMEOUT.
- 01b,09feb95,dab ensure ao->mru is not 0 when setting interface mtu.
- removed lcp_echo_fails_reached variable.
- 01a,21dec94,dab VxWorks port - first WRS version.
- +dzb added: path for ppp header files, WRS copyright.
- */
- #include "vxWorks.h"
- #include "stdio.h"
- #include "string.h"
- #include "sys/ioctl.h"
- #include "sys/types.h"
- #include "sys/socket.h"
- #include "sys/times.h"
- #include "netinet/in.h"
- #include "pppLib.h"
- /*
- * Callbacks for fsm code. (CI = Configuration Information)
- */
- static void lcp_resetci __ARGS((fsm *)); /* Reset our CI */
- static int lcp_cilen __ARGS((fsm *)); /* Return length of our CI */
- static void lcp_addci __ARGS((fsm *, u_char *, int *)); /* Add our CI to pkt */
- static int lcp_ackci __ARGS((fsm *, u_char *, int)); /* Peer ack'd our CI */
- static int lcp_nakci __ARGS((fsm *, u_char *, int)); /* Peer nak'd our CI */
- static int lcp_rejci __ARGS((fsm *, u_char *, int)); /* Peer rej'd our CI */
- static int lcp_reqci __ARGS((fsm *, u_char *, int *, int)); /* Rcv peer CI */
- static void lcp_up __ARGS((fsm *)); /* We're UP */
- static void lcp_down __ARGS((fsm *)); /* We're DOWN */
- static void lcp_starting __ARGS((fsm *)); /* We need lower layer up */
- static void lcp_finished __ARGS((fsm *)); /* We need lower layer down */
- static int lcp_extcode __ARGS((fsm *, int, int, u_char *, int));
- static void lcp_rprotrej __ARGS((fsm *, u_char *, int));
- /*
- * routines to send LCP echos to peer
- */
- static void lcp_echo_lowerup __ARGS((int));
- static void lcp_echo_lowerdown __ARGS((int));
- static void LcpEchoTimeout __ARGS((caddr_t));
- static void lcp_received_echo_reply __ARGS((fsm *, int, u_char *, int));
- static void LcpSendEchoRequest __ARGS((fsm *));
- static void LcpLinkFailure __ARGS((fsm *));
- static fsm_callbacks lcp_callbacks = { /* LCP callback routines */
- lcp_resetci, /* Reset our Configuration Information */
- lcp_cilen, /* Length of our Configuration Information */
- lcp_addci, /* Add our Configuration Information */
- lcp_ackci, /* ACK our Configuration Information */
- lcp_nakci, /* NAK our Configuration Information */
- lcp_rejci, /* Reject our Configuration Information */
- lcp_reqci, /* Request peer's Configuration Information */
- lcp_up, /* Called when fsm reaches OPENED state */
- lcp_down, /* Called when fsm leaves OPENED state */
- lcp_starting, /* Called when we want the lower layer up */
- lcp_finished, /* Called when we want the lower layer down */
- NULL, /* Called when Protocol-Reject received */
- NULL, /* Retransmission is necessary */
- lcp_extcode, /* Called to handle LCP-specific codes */
- "LCP" /* String name of protocol */
- };
- int lcp_warnloops = DEFWARNLOOPS; /* Warn about a loopback this often */
- /*
- * Length of each type of configuration option (in octets)
- */
- #define CILEN_VOID 2
- #define CILEN_SHORT 4 /* CILEN_VOID + sizeof(short) */
- #define CILEN_CHAP 5 /* CILEN_VOID + sizeof(short) + 1 */
- #define CILEN_LONG 6 /* CILEN_VOID + sizeof(long) */
- #define CILEN_LQR 8 /* CILEN_VOID + sizeof(short) + sizeof(long) */
- #define CODENAME(x) ((x) == CONFACK ? "ACK" :
- (x) == CONFNAK ? "NAK" : "REJ")
- static u_char nak_buffer[PPP_MRU]; /* where we construct a nak packet */
- /*
- * lcp_init - Initialize LCP.
- */
- void
- lcp_init(unit)
- int unit;
- {
- fsm *f = &ppp_if[unit]->lcp_fsm;
- lcp_options *wo = &ppp_if[unit]->lcp_wantoptions;
- lcp_options *ao = &ppp_if[unit]->lcp_allowoptions;
- f->unit = unit;
- f->protocol = LCP;
- f->callbacks = &lcp_callbacks;
- fsm_init(f);
- wo->passive = 0;
- wo->silent = 0;
- wo->restart = 0; /* Set to 1 in kernels or multi-line
- implementations */
- wo->neg_mru = 1;
- wo->mru = DEFMRU;
- wo->neg_asyncmap = 0;
- wo->asyncmap = 0;
- wo->neg_chap = 0; /* Set to 1 on server */
- wo->neg_upap = 0; /* Set to 1 on server */
- wo->chap_mdtype = CHAP_DIGEST_MD5;
- wo->neg_magicnumber = 1;
- wo->neg_pcompression = 1;
- wo->neg_accompression = 1;
- wo->neg_lqr = 0; /* no LQR implementation yet */
- ao->neg_mru = 1;
- ao->mru = MAXMRU;
- ao->neg_asyncmap = 1;
- ao->asyncmap = 0;
- ao->neg_chap = 1;
- ao->chap_mdtype = CHAP_DIGEST_MD5;
- ao->neg_upap = 1;
- ao->neg_magicnumber = 1;
- ao->neg_pcompression = 1;
- ao->neg_accompression = 1;
- ao->neg_lqr = 0; /* no LQR implementation yet */
- bzero((char *)ppp_if[unit]->xmit_accm, sizeof(ppp_if[unit]->xmit_accm[0]));
- ppp_if[unit]->xmit_accm[3] = 0x60000000;
- }
- /*
- * lcp_open - LCP is allowed to come up.
- */
- void
- lcp_open(unit)
- int unit;
- {
- fsm *f = &ppp_if[unit]->lcp_fsm;
- lcp_options *wo = &ppp_if[unit]->lcp_wantoptions;
- f->flags = 0;
- if (wo->passive)
- f->flags |= (OPT_PASSIVE | OPT_RESTART) ;
- if (wo->silent)
- f->flags |= (OPT_SILENT | OPT_RESTART);
- fsm_open(f);
- }
- /*
- * lcp_close - Take LCP down.
- */
- void
- lcp_close(unit)
- int unit;
- {
- fsm *f = &ppp_if[unit]->lcp_fsm;
- if (f->state == STOPPED && f->flags & (OPT_PASSIVE|OPT_SILENT)) {
- /*
- * This action is not strictly according to the FSM in RFC1548,
- * but it does mean that the program terminates if you do a
- * lcp_close(0) in passive/silent mode when a connection hasn't
- * been established.
- */
- f->state = CLOSED;
- lcp_finished(f);
- } else
- fsm_close(&ppp_if[unit]->lcp_fsm);
- }
- /*
- * lcp_lowerup - The lower layer is up.
- */
- void
- lcp_lowerup(unit)
- int unit;
- {
- sifdown(unit);
- ppp_set_xaccm(unit, ppp_if[unit]->xmit_accm);
- ppp_send_config(unit, MTU, 0xffffffff, 0, 0);
- ppp_recv_config(unit, MTU, 0x00000000, 0, 0);
- ppp_if[unit]->peer_mru = MTU;
- ppp_if[unit]->lcp_allowoptions.asyncmap = ppp_if[unit]->xmit_accm[0];
- fsm_lowerup(&ppp_if[unit]->lcp_fsm);
- }
- /*
- * lcp_lowerdown - The lower layer is down.
- */
- void
- lcp_lowerdown(unit)
- int unit;
- {
- fsm_lowerdown(&ppp_if[unit]->lcp_fsm);
- }
- /*
- * lcp_input - Input LCP packet.
- */
- void
- lcp_input(unit, p, len)
- int unit;
- u_char *p;
- int len;
- {
- fsm_input(&ppp_if[unit]->lcp_fsm, p, len);
- }
- /*
- * lcp_extcode - Handle a LCP-specific code.
- */
- static int
- lcp_extcode(f, code, id, inp, len)
- fsm *f;
- int code, id;
- u_char *inp;
- int len;
- {
- u_char *magp;
- switch( code ){
- case PROTREJ:
- lcp_rprotrej(f, inp, len);
- break;
-
- case ECHOREQ:
- if (f->state != OPENED)
- break;
- LCPDEBUG((LOG_INFO, "lcp: Echo-Request, Rcvd id %d", id));
- magp = inp;
- PUTLONG(ppp_if[f->unit]->lcp_gotoptions.magicnumber, magp);
- if (len < CILEN_LONG)
- len = CILEN_LONG;
- fsm_sdata(f, ECHOREP, id, inp, len);
- break;
-
- case ECHOREP:
- lcp_received_echo_reply(f, id, inp, len);
- break;
- case DISCREQ:
- break;
- default:
- return 0;
- }
- return 1;
- }
-
- /*
- * lcp_rprotrej - Receive an Protocol-Reject.
- *
- * Figure out which protocol is rejected and inform it.
- */
- static void
- lcp_rprotrej(f, inp, len)
- fsm *f;
- u_char *inp;
- int len;
- {
- u_short prot;
- LCPDEBUG((LOG_INFO, "lcp_rprotrej."));
- if (len < sizeof (u_short)) {
- LCPDEBUG((LOG_INFO,
- "lcp_rprotrej: Rcvd short Protocol-Reject packet!"));
- return;
- }
- GETSHORT(prot, inp);
- LCPDEBUG((LOG_INFO,
- "lcp_rprotrej: Rcvd Protocol-Reject packet for %x!",
- prot));
- /*
- * Protocol-Reject packets received in any state other than the LCP
- * OPENED state SHOULD be silently discarded.
- */
- if( f->state != OPENED ){
- LCPDEBUG((LOG_INFO, "Protocol-Reject discarded: LCP in state %d",
- f->state));
- return;
- }
- DEMUXPROTREJ(f->unit, prot); /* Inform protocol */
- }
- /*
- * lcp_protrej - A Protocol-Reject was received.
- */
- /*ARGSUSED*/
- void
- lcp_protrej(unit)
- int unit;
- {
- /*
- * Can't reject LCP!
- */
- LCPDEBUG((LOG_WARNING,
- "lcp_protrej: Received Protocol-Reject for LCP!"));
- fsm_protreject(&ppp_if[unit]->lcp_fsm);
- }
- /*
- * lcp_sprotrej - Send a Protocol-Reject for some protocol.
- */
- void
- lcp_sprotrej(unit, p, len)
- int unit;
- u_char *p;
- int len;
- {
- /*
- * Send back the protocol and the information field of the
- * rejected packet. We only get here if LCP is in the OPENED state.
- */
- p += 2;
- len -= 2;
- fsm_sdata(&ppp_if[unit]->lcp_fsm, PROTREJ, ++ppp_if[unit]->lcp_fsm.id,
- p, len);
- }
- /*
- * lcp_resetci - Reset our CI.
- */
- static void
- lcp_resetci(f)
- fsm *f;
- {
- ppp_if[f->unit]->lcp_wantoptions.magicnumber = magic();
- ppp_if[f->unit]->lcp_wantoptions.numloops = 0;
- ppp_if[f->unit]->lcp_gotoptions = ppp_if[f->unit]->lcp_wantoptions;
- ppp_if[f->unit]->peer_mru = MTU;
- }
- /*
- * lcp_cilen - Return length of our CI.
- */
- static int
- lcp_cilen(f)
- fsm *f;
- {
- lcp_options *go = &ppp_if[f->unit]->lcp_gotoptions;
- #define LENCIVOID(neg) (neg ? CILEN_VOID : 0)
- #define LENCICHAP(neg) (neg ? CILEN_CHAP : 0)
- #define LENCISHORT(neg) (neg ? CILEN_SHORT : 0)
- #define LENCILONG(neg) (neg ? CILEN_LONG : 0)
- #define LENCILQR(neg) (neg ? CILEN_LQR: 0)
- /*
- * NB: we only ask for one of CHAP and UPAP, even if we will
- * accept either.
- */
- return (LENCISHORT(go->neg_mru) +
- LENCILONG(go->neg_asyncmap) +
- LENCICHAP(go->neg_chap) +
- LENCISHORT(!go->neg_chap && go->neg_upap) +
- LENCILQR(go->neg_lqr) +
- LENCILONG(go->neg_magicnumber) +
- LENCIVOID(go->neg_pcompression) +
- LENCIVOID(go->neg_accompression));
- }
- /*
- * lcp_addci - Add our desired CIs to a packet.
- */
- static void
- lcp_addci(f, ucp, lenp)
- fsm *f;
- u_char *ucp;
- int *lenp;
- {
- lcp_options *go = &ppp_if[f->unit]->lcp_gotoptions;
- u_char *start_ucp = ucp;
- #define ADDCIVOID(opt, neg)
- if (neg) {
- PUTCHAR(opt, ucp);
- PUTCHAR(CILEN_VOID, ucp);
- }
- #define ADDCISHORT(opt, neg, val)
- if (neg) {
- PUTCHAR(opt, ucp);
- PUTCHAR(CILEN_SHORT, ucp);
- PUTSHORT(val, ucp);
- }
- #define ADDCICHAP(opt, neg, val, digest)
- if (neg) {
- PUTCHAR(opt, ucp);
- PUTCHAR(CILEN_CHAP, ucp);
- PUTSHORT(val, ucp);
- PUTCHAR(digest, ucp);
- }
- #define ADDCILONG(opt, neg, val)
- if (neg) {
- PUTCHAR(opt, ucp);
- PUTCHAR(CILEN_LONG, ucp);
- PUTLONG(val, ucp);
- }
- #define ADDCILQR(opt, neg, val)
- if (neg) {
- PUTCHAR(opt, ucp);
- PUTCHAR(CILEN_LQR, ucp);
- PUTSHORT(LQR, ucp);
- PUTLONG(val, ucp);
- }
- ADDCISHORT(CI_MRU, go->neg_mru, go->mru);
- ADDCILONG(CI_ASYNCMAP, go->neg_asyncmap, go->asyncmap);
- ADDCICHAP(CI_AUTHTYPE, go->neg_chap, CHAP, go->chap_mdtype);
- ADDCISHORT(CI_AUTHTYPE, !go->neg_chap && go->neg_upap, UPAP);
- ADDCILQR(CI_QUALITY, go->neg_lqr, go->lqr_period);
- ADDCILONG(CI_MAGICNUMBER, go->neg_magicnumber, go->magicnumber);
- ADDCIVOID(CI_PCOMPRESSION, go->neg_pcompression);
- ADDCIVOID(CI_ACCOMPRESSION, go->neg_accompression);
- if (ucp - start_ucp != *lenp) {
- /* this should never happen, because peer_mtu should be 1500 */
- syslog(LOG_ERR, "Bug in lcp_addci: wrong length");
- }
- }
- /*
- * lcp_ackci - Ack our CIs.
- * This should not modify any state if the Ack is bad.
- *
- * Returns:
- * 0 - Ack was bad.
- * 1 - Ack was good.
- */
- static int
- lcp_ackci(f, p, len)
- fsm *f;
- u_char *p;
- int len;
- {
- lcp_options *go = &ppp_if[f->unit]->lcp_gotoptions;
- u_char cilen, citype, cichar;
- u_short cishort;
- u_long cilong;
- /*
- * CIs must be in exactly the same order that we sent.
- * Check packet length and CI length at each step.
- * If we find any deviations, then this packet is bad.
- */
- #define ACKCIVOID(opt, neg)
- if (neg) {
- if ((len -= CILEN_VOID) < 0)
- goto bad;
- GETCHAR(citype, p);
- GETCHAR(cilen, p);
- if (cilen != CILEN_VOID ||
- citype != opt)
- goto bad;
- }
- #define ACKCISHORT(opt, neg, val)
- if (neg) {
- if ((len -= CILEN_SHORT) < 0)
- goto bad;
- GETCHAR(citype, p);
- GETCHAR(cilen, p);
- if (cilen != CILEN_SHORT ||
- citype != (u_char)opt)
- goto bad;
- GETSHORT(cishort, p);
- if (cishort != (u_short)val)
- goto bad;
- }
- #define ACKCICHAP(opt, neg, val, digest)
- if (neg) {
- if ((len -= CILEN_CHAP) < 0)
- goto bad;
- GETCHAR(citype, p);
- GETCHAR(cilen, p);
- if (cilen != CILEN_CHAP ||
- citype != (u_char)opt)
- goto bad;
- GETSHORT(cishort, p);
- if (cishort != (u_short)val)
- goto bad;
- GETCHAR(cichar, p);
- if (cichar != (u_char)digest)
- goto bad;
- }
- #define ACKCILONG(opt, neg, val)
- if (neg) {
- if ((len -= CILEN_LONG) < 0)
- goto bad;
- GETCHAR(citype, p);
- GETCHAR(cilen, p);
- if (cilen != CILEN_LONG ||
- citype != (u_char)opt)
- goto bad;
- GETLONG(cilong, p);
- if (cilong != (u_long)val)
- goto bad;
- }
- #define ACKCILQR(opt, neg, val)
- if (neg) {
- if ((len -= CILEN_LQR) < 0)
- goto bad;
- GETCHAR(citype, p);
- GETCHAR(cilen, p);
- if (cilen != CILEN_LQR ||
- citype != (u_char)opt)
- goto bad;
- GETSHORT(cishort, p);
- if (cishort != LQR)
- goto bad;
- GETLONG(cilong, p);
- if (cilong != (u_long)val)
- goto bad;
- }
- ACKCISHORT(CI_MRU, go->neg_mru, go->mru);
- ACKCILONG(CI_ASYNCMAP, go->neg_asyncmap, go->asyncmap);
- ACKCICHAP(CI_AUTHTYPE, go->neg_chap, CHAP, go->chap_mdtype);
- ACKCISHORT(CI_AUTHTYPE, !go->neg_chap && go->neg_upap, UPAP);
- ACKCILQR(CI_QUALITY, go->neg_lqr, go->lqr_period);
- ACKCILONG(CI_MAGICNUMBER, go->neg_magicnumber, go->magicnumber);
- ACKCIVOID(CI_PCOMPRESSION, go->neg_pcompression);
- ACKCIVOID(CI_ACCOMPRESSION, go->neg_accompression);
- /*
- * If there are any remaining CIs, then this packet is bad.
- */
- if (len != 0)
- goto bad;
- return (1);
- bad:
- LCPDEBUG((LOG_WARNING, "lcp_acki: received bad Ack!"));
- return (0);
- }
- /*
- * lcp_nakci - Peer has sent a NAK for some of our CIs.
- * This should not modify any state if the Nak is bad
- * or if LCP is in the OPENED state.
- *
- * Returns:
- * 0 - Nak was bad.
- * 1 - Nak was good.
- */
- static int
- lcp_nakci(f, p, len)
- fsm *f;
- u_char *p;
- int len;
- {
- lcp_options *go = &ppp_if[f->unit]->lcp_gotoptions;
- lcp_options *wo = &ppp_if[f->unit]->lcp_wantoptions;
- u_char cilen, citype, cichar, *next;
- u_short cishort = 0;
- u_long cilong;
- lcp_options no; /* options we've seen Naks for */
- lcp_options try; /* options to request next time */
- int looped_back = 0;
- BZERO((char *)&no, sizeof(no));
- try = *go;
- /*
- * Any Nak'd CIs must be in exactly the same order that we sent.
- * Check packet length and CI length at each step.
- * If we find any deviations, then this packet is bad.
- */
- #define NAKCIVOID(opt, neg, code)
- if (go->neg &&
- len >= CILEN_VOID &&
- p[1] == CILEN_VOID &&
- p[0] == opt) {
- len -= CILEN_VOID;
- INCPTR(CILEN_VOID, p);
- no.neg = 1;
- code
- }
- #define NAKCICHAP(opt, neg, code)
- if (go->neg &&
- len >= CILEN_CHAP &&
- p[1] == CILEN_CHAP &&
- p[0] == opt) {
- len -= CILEN_CHAP;
- INCPTR(2, p);
- GETSHORT(cishort, p);
- GETCHAR(cichar, p);
- no.neg = 1;
- code
- }
- #define NAKCISHORT(opt, neg, code)
- if (go->neg &&
- len >= CILEN_SHORT &&
- p[1] == CILEN_SHORT &&
- p[0] == opt) {
- len -= CILEN_SHORT;
- INCPTR(2, p);
- GETSHORT(cishort, p);
- no.neg = 1;
- code
- }
- #define NAKCILONG(opt, neg, code)
- if (go->neg &&
- len >= CILEN_LONG &&
- p[1] == CILEN_LONG &&
- p[0] == opt) {
- len -= CILEN_LONG;
- INCPTR(2, p);
- GETLONG(cilong, p);
- no.neg = 1;
- code
- }
- #define NAKCILQR(opt, neg, code)
- if (go->neg &&
- len >= CILEN_LQR &&
- p[1] == CILEN_LQR &&
- p[0] == opt) {
- len -= CILEN_LQR;
- INCPTR(2, p);
- GETSHORT(cishort, p);
- GETLONG(cilong, p);
- no.neg = 1;
- code
- }
- /*
- * We don't care if they want to send us smaller packets than
- * we want. Therefore, accept any MRU less than what we asked for,
- * but then ignore the new value when setting the MRU in the kernel.
- * If they send us a bigger MRU than what we asked, accept it, up to
- * the limit of the default MRU we'd get if we didn't negotiate.
- */
- NAKCISHORT(CI_MRU, neg_mru,
- if (cishort <= wo->mru || cishort < DEFMRU)
- try.mru = cishort;
- );
- /*
- * Add any characters they want to our (receive-side) asyncmap.
- */
- NAKCILONG(CI_ASYNCMAP, neg_asyncmap,
- try.asyncmap = go->asyncmap | cilong;
- );
- /*
- * If they can't cope with our CHAP hash algorithm, we'll have
- * to stop asking for CHAP. We haven't got any other algorithm.
- */
- NAKCICHAP(CI_AUTHTYPE, neg_chap,
- try.neg_chap = 0;
- );
- /*
- * Peer shouldn't send Nak for UPAP, protocol compression or
- * address/control compression requests; they should send
- * a Reject instead. If they send a Nak, treat it as a Reject.
- */
- if (!go->neg_chap ){
- NAKCISHORT(CI_AUTHTYPE, neg_upap,
- try.neg_upap = 0;
- );
- }
- /*
- * If they can't cope with our link quality protocol, we'll have
- * to stop asking for LQR. We haven't got any other protocol.
- * If they Nak the reporting period, take their value XXX ?
- */
- NAKCILQR(CI_QUALITY, neg_lqr,
- if (cishort != LQR)
- try.neg_lqr = 0;
- else
- try.lqr_period = cilong;
- );
- /*
- * Check for a looped-back line.
- */
- NAKCILONG(CI_MAGICNUMBER, neg_magicnumber,
- try.magicnumber = magic();
- ++try.numloops;
- looped_back = 1;
- );
- NAKCIVOID(CI_PCOMPRESSION, neg_pcompression,
- try.neg_pcompression = 0;
- );
- NAKCIVOID(CI_ACCOMPRESSION, neg_accompression,
- try.neg_accompression = 0;
- );
- /*
- * There may be remaining CIs, if the peer is requesting negotiation
- * on an option that we didn't include in our request packet.
- * If we see an option that we requested, or one we've already seen
- * in this packet, then this packet is bad.
- * If we wanted to respond by starting to negotiate on the requested
- * option(s), we could, but we don't, because except for the
- * authentication type and quality protocol, if we are not negotiating
- * an option, it is because we were told not to.
- * For the authentication type, the Nak from the peer means
- * `let me authenticate myself with you' which is a bit pointless.
- * For the quality protocol, the Nak means `ask me to send you quality
- * reports', but if we didn't ask for them, we don't want them.
- */
- while (len > CILEN_VOID) {
- GETCHAR(citype, p);
- GETCHAR(cilen, p);
- if( (len -= cilen) < 0 )
- goto bad;
- next = p + cilen - 2;
- switch (citype) {
- case CI_MRU:
- if (go->neg_mru || no.neg_mru || cilen != CILEN_SHORT)
- goto bad;
- break;
- case CI_ASYNCMAP:
- if (go->neg_asyncmap || no.neg_asyncmap || cilen != CILEN_LONG)
- goto bad;
- break;
- case CI_AUTHTYPE:
- if (go->neg_chap || no.neg_chap || go->neg_upap || no.neg_upap)
- goto bad;
- break;
- case CI_MAGICNUMBER:
- if (go->neg_magicnumber || no.neg_magicnumber ||
- cilen != CILEN_LONG)
- goto bad;
- break;
- case CI_PCOMPRESSION:
- if (go->neg_pcompression || no.neg_pcompression
- || cilen != CILEN_VOID)
- goto bad;
- break;
- case CI_ACCOMPRESSION:
- if (go->neg_accompression || no.neg_accompression
- || cilen != CILEN_VOID)
- goto bad;
- break;
- case CI_QUALITY:
- if (go->neg_lqr || no.neg_lqr || cilen != CILEN_LQR)
- goto bad;
- break;
- default:
- goto bad;
- }
- p = next;
- }
- /* If there is still anything left, this packet is bad. */
- if (len != 0)
- goto bad;
- /*
- * OK, the Nak is good. Now we can update state.
- */
- if (f->state != OPENED) {
- *go = try;
- if (looped_back && try.numloops % lcp_warnloops == 0)
- LCPDEBUG((LOG_INFO, "The line appears to be looped back."));
- }
- return 1;
- bad:
- LCPDEBUG((LOG_WARNING, "lcp_nakci: received bad Nak!"));
- return 0;
- }
- /*
- * lcp_rejci - Peer has Rejected some of our CIs.
- * This should not modify any state if the Reject is bad
- * or if LCP is in the OPENED state.
- *
- * Returns:
- * 0 - Reject was bad.
- * 1 - Reject was good.
- */
- static int
- lcp_rejci(f, p, len)
- fsm *f;
- u_char *p;
- int len;
- {
- lcp_options *go = &ppp_if[f->unit]->lcp_gotoptions;
- u_char cichar = 0;
- u_short cishort;
- u_long cilong;
- #ifdef DEBUGLCP
- u_char *start = p;
- int plen = len;
- #endif /* DEBUGLCP */
- lcp_options try; /* options to request next time */
- try = *go;
- /*
- * Any Rejected CIs must be in exactly the same order that we sent.
- * Check packet length and CI length at each step.
- * If we find any deviations, then this packet is bad.
- */
- #define REJCIVOID(opt, neg)
- if (go->neg &&
- len >= CILEN_VOID &&
- p[1] == CILEN_VOID &&
- p[0] == opt) {
- len -= CILEN_VOID;
- INCPTR(CILEN_VOID, p);
- try.neg = 0;
- LCPDEBUG((LOG_INFO, "lcp_rejci rejected void opt %d", opt));
- }
- #define REJCISHORT(opt, neg, val)
- if (go->neg &&
- len >= CILEN_SHORT &&
- p[1] == CILEN_SHORT &&
- p[0] == opt) {
- len -= CILEN_SHORT;
- INCPTR(2, p);
- GETSHORT(cishort, p);
- /* Check rejected value. */
- if (cishort != (u_short)val)
- goto bad;
- try.neg = 0;
- LCPDEBUG((LOG_INFO,"lcp_rejci rejected short opt %d", opt));
- }
- #define REJCICHAP(opt, neg, val, digest)
- if (go->neg &&
- len >= CILEN_CHAP &&
- p[1] == CILEN_CHAP &&
- p[0] == opt) {
- len -= CILEN_CHAP;
- INCPTR(2, p);
- GETSHORT(cishort, p);
- GETCHAR(cichar, p);
- /* Check rejected value. */
- if (cishort != (u_short)val || cichar != (u_char)digest)
- goto bad;
- try.neg = 0;
- LCPDEBUG((LOG_INFO,"lcp_rejci rejected chap opt %d", opt));
- }
- #define REJCILONG(opt, neg, val)
- if (go->neg &&
- len >= CILEN_LONG &&
- p[1] == CILEN_LONG &&
- p[0] == opt) {
- len -= CILEN_LONG;
- INCPTR(2, p);
- GETLONG(cilong, p);
- /* Check rejected value. */
- if (cilong != (u_long)val)
- goto bad;
- try.neg = 0;
- LCPDEBUG((LOG_INFO,"lcp_rejci rejected long opt %d", opt));
- }
- #define REJCILQR(opt, neg, val)
- if (go->neg &&
- len >= CILEN_LQR &&
- p[1] == CILEN_LQR &&
- p[0] == opt) {
- len -= CILEN_LQR;
- INCPTR(2, p);
- GETSHORT(cishort, p);
- GETLONG(cilong, p);
- /* Check rejected value. */
- if (cishort != LQR || cilong != val)
- goto bad;
- try.neg = 0;
- LCPDEBUG((LOG_INFO,"lcp_rejci rejected LQR opt %d", opt));
- }
- REJCISHORT(CI_MRU, neg_mru, go->mru);
- REJCILONG(CI_ASYNCMAP, neg_asyncmap, go->asyncmap);
- REJCICHAP(CI_AUTHTYPE, neg_chap, CHAP, go->chap_mdtype);
- if (!go->neg_chap) {
- REJCISHORT(CI_AUTHTYPE, neg_upap, UPAP);
- }
- REJCILQR(CI_QUALITY, neg_lqr, go->lqr_period);
- REJCILONG(CI_MAGICNUMBER, neg_magicnumber, go->magicnumber);
- REJCIVOID(CI_PCOMPRESSION, neg_pcompression);
- REJCIVOID(CI_ACCOMPRESSION, neg_accompression);
- /*
- * If there are any remaining CIs, then this packet is bad.
- */
- if (len != 0)
- goto bad;
- /*
- * Now we can update state.
- */
- if (f->state != OPENED)
- *go = try;
- return 1;
- bad:
- LCPDEBUG((LOG_WARNING, "lcp_rejci: received bad Reject!"));
- LCPDEBUG((LOG_WARNING, "lcp_rejci: plen %d len %d off %d",
- plen, len, p - start));
- return 0;
- }
- /*
- * lcp_reqci - Check the peer's requested CIs and send appropriate response.
- *
- * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
- * appropriately. If reject_if_disagree is non-zero, doesn't return
- * CONFNAK; returns CONFREJ if it can't return CONFACK.
- */
- static int
- lcp_reqci(f, inp, lenp, reject_if_disagree)
- fsm *f;
- u_char *inp; /* Requested CIs */
- int *lenp; /* Length of requested CIs */
- int reject_if_disagree;
- {
- lcp_options *go = &ppp_if[f->unit]->lcp_gotoptions;
- lcp_options *ho = &ppp_if[f->unit]->lcp_hisoptions;
- lcp_options *ao = &ppp_if[f->unit]->lcp_allowoptions;
- u_char *cip, *next; /* Pointer to current and next CIs */
- u_char cilen, citype = 0, cichar;/* Parsed len, type, char value */
- u_short cishort; /* Parsed short value */
- u_long cilong; /* Parse long value */
- int rc = CONFACK; /* Final packet return code */
- int orc; /* Individual option return code */
- u_char *p; /* Pointer to next char to parse */
- u_char *rejp; /* Pointer to next char in reject frame */
- u_char *nakp; /* Pointer to next char in Nak frame */
- int l = *lenp; /* Length left */
- /*
- * Reset all his options.
- */
- BZERO((char *)ho, sizeof(*ho));
- /*
- * Process all his options.
- */
- next = inp;
- nakp = nak_buffer;
- rejp = inp;
- while (l) {
- orc = CONFACK; /* Assume success */
- cip = p = next; /* Remember begining of CI */
- if (l < 2 || /* Not enough data for CI header or */
- p[1] < 2 || /* CI length too small or */
- p[1] > l) { /* CI length too big? */
- LCPDEBUG((LOG_WARNING, "lcp_reqci: bad CI length!"));
- orc = CONFREJ; /* Reject bad CI */
- cilen = l; /* Reject till end of packet */
- l = 0; /* Don't loop again */
- goto endswitch;
- }
- GETCHAR(citype, p); /* Parse CI type */
- GETCHAR(cilen, p); /* Parse CI length */
- l -= cilen; /* Adjust remaining length */
- next += cilen; /* Step to next CI */
- switch (citype) { /* Check CI type */
- case CI_MRU:
- LCPDEBUG((LOG_INFO, "lcp_reqci: rcvd MRU"));
- if (!ao->neg_mru || /* Allow option? */
- cilen != CILEN_SHORT) { /* Check CI length */
- orc = CONFREJ; /* Reject CI */
- break;
- }
- GETSHORT(cishort, p); /* Parse MRU */
- LCPDEBUG((LOG_INFO, "(%d)", cishort));
- /*
- * He must be able to receive at least our minimum.
- * No need to check a maximum. If he sends a large number,
- * we'll just ignore it.
- */
- if (cishort < MINMRU) {
- orc = CONFNAK; /* Nak CI */
- if( !reject_if_disagree ){
- DECPTR(sizeof (short), p); /* Backup */
- PUTSHORT(MINMRU, p); /* Give him a hint */
- }
- break;
- }
- ho->neg_mru = 1; /* Remember he sent MRU */
- ho->mru = cishort; /* And remember value */
- break;
- case CI_ASYNCMAP:
- LCPDEBUG((LOG_INFO, "lcp_reqci: rcvd ASYNCMAP"));
- if (!ao->neg_asyncmap ||
- cilen != CILEN_LONG) {
- orc = CONFREJ;
- break;
- }
- GETLONG(cilong, p);
- LCPDEBUG((LOG_INFO, "(%lx)", cilong));
- /*
- * Asyncmap must have set at least the bits
- * which are set in lcp_allowoptions[unit].asyncmap.
- */
- if ((ao->asyncmap & ~cilong) != 0) {
- orc = CONFNAK;
- if( !reject_if_disagree ){
- DECPTR(sizeof (long), p);
- PUTLONG(ao->asyncmap | cilong, p);
- }
- break;
- }
- ho->neg_asyncmap = 1;
- ho->asyncmap = cilong;
- break;
- case CI_AUTHTYPE:
- LCPDEBUG((LOG_INFO, "lcp_reqci: rcvd AUTHTYPE"));
- if (cilen < CILEN_SHORT ||
- !(ao->neg_upap || ao->neg_chap)) {
- orc = CONFREJ;
- if (!ao->neg_upap && !ao->neg_chap)
- LCPDEBUG((LOG_INFO, " we're not willing to authenticate"));
- else
- LCPDEBUG((LOG_INFO, " cilen is too short!"));
- break;
- }
- GETSHORT(cishort, p);
- LCPDEBUG((LOG_INFO, "(%x)", cishort));
- /*
- * Authtype must be UPAP or CHAP.
- *
- * Note: if both ao->neg_upap and ao->neg_chap are set,
- * and the peer sends a Configure-Request with two
- * authenticate-protocol requests, one for CHAP and one
- * for UPAP, then we will reject the second request.
- * Whether we end up doing CHAP or UPAP depends then on
- * the ordering of the CIs in the peer's Configure-Request.
- */
- if (cishort == UPAP) {
- if (ho->neg_chap || /* we've already accepted CHAP */
- cilen != CILEN_SHORT) {
- LCPDEBUG((LOG_WARNING,
- "lcp_reqci: rcvd AUTHTYPE PAP, rejecting..."));
- orc = CONFREJ;
- break;
- }
- if (!ao->neg_upap) { /* we don't want to do PAP */
- orc = CONFNAK; /* NAK it and suggest CHAP */
- PUTCHAR(CI_AUTHTYPE, nakp);
- PUTCHAR(CILEN_CHAP, nakp);
- PUTSHORT(CHAP, nakp);
- PUTCHAR(ao->chap_mdtype, nakp);
- break;
- }
- ho->neg_upap = 1;
- break;
- }
- if (cishort == CHAP) {
- if (ho->neg_upap || /* we've already accepted PAP */
- cilen != CILEN_CHAP) {
- LCPDEBUG((LOG_INFO,
- "lcp_reqci: rcvd AUTHTYPE CHAP, rejecting..."));
- orc = CONFREJ;
- break;
- }
- if (!ao->neg_chap) { /* we don't want to do CHAP */
- orc = CONFNAK; /* NAK it and suggest PAP */
- PUTCHAR(CI_AUTHTYPE, nakp);
- PUTCHAR(CILEN_SHORT, nakp);
- PUTSHORT(UPAP, nakp);
- break;
- }
- GETCHAR(cichar, p); /* get digest type*/
- if (cichar != (u_char)ao->chap_mdtype) {
- orc = CONFNAK;
- PUTCHAR(CI_AUTHTYPE, nakp);
- PUTCHAR(CILEN_CHAP, nakp);
- PUTSHORT(CHAP, nakp);
- PUTCHAR(ao->chap_mdtype, nakp);
- break;
- }
- ho->chap_mdtype = cichar; /* save md type */
- ho->neg_chap = 1;
- break;
- }
- /*
- * We don't recognize the protocol they're asking for.
- * Nak it with something we're willing to do.
- * (At this point we know ao->neg_upap || ao->neg_chap.)
- */
- orc = CONFNAK;
- PUTCHAR(CI_AUTHTYPE, nakp);
- if (ao->neg_chap) {
- PUTCHAR(CILEN_CHAP, nakp);
- PUTSHORT(CHAP, nakp);
- PUTCHAR(ao->chap_mdtype, nakp);
- } else {
- PUTCHAR(CILEN_SHORT, nakp);
- PUTSHORT(UPAP, nakp);
- }
- break;
-
- case CI_QUALITY:
- LCPDEBUG((LOG_INFO, "lcp_reqci: rcvd QUALITY"));
- if (!ao->neg_lqr ||
- cilen != CILEN_LQR) {
- orc = CONFREJ;
- break;
- }
- GETSHORT(cishort, p);
- GETLONG(cilong, p);
- LCPDEBUG((LOG_INFO, "(%x %lx)", cishort, cilong));
- /*
- * Check the protocol and the reporting period.
- * XXX When should we Nak this, and what with?
- */
- if (cishort != LQR) {
- orc = CONFNAK;
- PUTCHAR(CI_QUALITY, nakp);
- PUTCHAR(CILEN_LQR, nakp);
- PUTSHORT(LQR, nakp);
- PUTLONG(ao->lqr_period, nakp);
- break;
- }
- break;
- case CI_MAGICNUMBER:
- LCPDEBUG((LOG_INFO, "lcp_reqci: rcvd MAGICNUMBER"));
- if (!(ao->neg_magicnumber || go->neg_magicnumber) ||
- cilen != CILEN_LONG) {
- orc = CONFREJ;
- break;
- }
- GETLONG(cilong, p);
- LCPDEBUG((LOG_INFO, "(%lx)", cilong));
- /*
- * He must have a different magic number.
- */
- if (go->neg_magicnumber &&
- cilong == go->magicnumber) {
- orc = CONFNAK;
- cilong = magic(); /* Don't put magic() inside macro! */
- orc = CONFNAK;
- PUTCHAR(CI_MAGICNUMBER, nakp);
- PUTCHAR(CILEN_LONG, nakp);
- PUTLONG(cilong, nakp);
- break;
- }
- ho->neg_magicnumber = 1;
- ho->magicnumber = cilong;
- break;
- case CI_PCOMPRESSION:
- LCPDEBUG((LOG_INFO, "lcp_reqci: rcvd PCOMPRESSION"));
- if (!ao->neg_pcompression ||
- cilen != CILEN_VOID) {
- orc = CONFREJ;
- break;
- }
- ho->neg_pcompression = 1;
- break;
- case CI_ACCOMPRESSION:
- LCPDEBUG((LOG_INFO, "lcp_reqci: rcvd ACCOMPRESSION"));
- if (!ao->neg_accompression ||
- cilen != CILEN_VOID) {
- orc = CONFREJ;
- break;
- }
- ho->neg_accompression = 1;
- break;
- default:
- LCPDEBUG((LOG_INFO, "lcp_reqci: rcvd unknown option %d",
- citype));
- orc = CONFREJ;
- break;
- }
- endswitch:
- LCPDEBUG((LOG_INFO, " (%s)", CODENAME(orc)));
- if (orc == CONFACK && /* Good CI */
- rc != CONFACK) /* but prior CI wasnt? */
- continue; /* Don't send this one */
- if (orc == CONFNAK) { /* Nak this CI? */
- if (reject_if_disagree /* Getting fed up with sending NAKs? */
- && citype != CI_MAGICNUMBER) {
- orc = CONFREJ; /* Get tough if so */
- } else {
- if (rc == CONFREJ) /* Rejecting prior CI? */
- continue; /* Don't send this one */
- rc = CONFNAK;
- }
- }
- if (orc == CONFREJ) { /* Reject this CI */
- rc = CONFREJ;
- if (cip != rejp) /* Need to move rejected CI? */
- BCOPY(cip, rejp, cilen); /* Move it */
- INCPTR(cilen, rejp); /* Update output pointer */
- }
- }
- /*
- * If we wanted to send additional NAKs (for unsent CIs), the
- * code would go here. The extra NAKs would go at *nakp.
- * At present there are no cases where we want to ask the
- * peer to negotiate an option.
- */
- switch (rc) {
- case CONFACK:
- *lenp = next - inp;
- break;
- case CONFNAK:
- /*
- * Copy the Nak'd options from the nak_buffer to the caller's buffer.
- */
- *lenp = nakp - nak_buffer;
- BCOPY(nak_buffer, inp, *lenp);
- break;
- case CONFREJ:
- *lenp = rejp - inp;
- break;
- }
- LCPDEBUG((LOG_INFO, "lcp_reqci: returning CONF%s.", CODENAME(rc)));
- return (rc); /* Return final code */
- }
- /*
- * lcp_up - LCP has come UP.
- *
- * Start UPAP, IPCP, etc.
- */
- static void
- lcp_up(f)
- fsm *f;
- {
- lcp_options *wo = &ppp_if[f->unit]->lcp_wantoptions;
- lcp_options *ho = &ppp_if[f->unit]->lcp_hisoptions;
- lcp_options *go = &ppp_if[f->unit]->lcp_gotoptions;
- lcp_options *ao = &ppp_if[f->unit]->lcp_allowoptions;
- if (!go->neg_magicnumber)
- go->magicnumber = 0;
- if (!ho->neg_magicnumber)
- ho->magicnumber = 0;
- /*
- * Set our MTU to the smaller of the MTU we wanted and
- * the MRU our peer wanted. If we negotiated an MRU,
- * set our MRU to the larger of value we wanted and
- * the value we got in the negotiation.
- */
- ppp_send_config(f->unit,
- MIN(ao->mru? ao->mru: MTU, (ho->neg_mru? ho->mru: MTU)),
- (ho->neg_asyncmap? ho->asyncmap: 0xffffffff),
- ho->neg_pcompression, ho->neg_accompression);
- /*
- * If the asyncmap hasn't been negotiated, we really should
- * set the receive asyncmap to ffffffff, but we set it to 0
- * for backwards contemptibility.
- */
- ppp_recv_config(f->unit, (go->neg_mru? MAX(wo->mru, go->mru): MTU),
- (go->neg_asyncmap? go->asyncmap: 0x00000000),
- go->neg_pcompression, go->neg_accompression);
- if (ho->neg_mru)
- ppp_if[f->unit]->peer_mru = ho->mru;
- ChapLowerUp(f->unit); /* Enable CHAP */
- upap_lowerup(f->unit); /* Enable UPAP */
- ipcp_lowerup(f->unit); /* Enable IPCP */
- lcp_echo_lowerup(f->unit); /* Enable echo messages */
- link_established(f->unit);
- }
- /*
- * lcp_down - LCP has gone DOWN.
- *
- * Alert other protocols.
- */
- static void
- lcp_down(f)
- fsm *f;
- {
- lcp_echo_lowerdown(f->unit);
- ipcp_lowerdown(f->unit);
- ChapLowerDown(f->unit);
- upap_lowerdown(f->unit);
- sifdown(f->unit);
- ppp_send_config(f->unit, MTU, 0xffffffff, 0, 0);
- ppp_recv_config(f->unit, MTU, 0x00000000, 0, 0);
- ppp_if[f->unit]->peer_mru = MTU;
- link_down(f->unit);
- }
- /*
- * lcp_starting - LCP needs the lower layer up.
- */
- static void
- lcp_starting(f)
- fsm *f;
- {
- link_required(f->unit);
- }
- /*
- * lcp_finished - LCP has finished with the lower layer.
- */
- static void
- lcp_finished(f)
- fsm *f;
- {
- /* if passive or silent flags set and if lcp state is STOPPED or CLOSED
- * then reopen the link for the next connection
- */
- if (((f->state == STOPPED) || (f->state == CLOSED)) &&
- (f->flags & OPT_RESTART))
- fsm_open (f);
- else
- link_terminated(f->unit);
- }
- /*
- * lcp_printpkt - print the contents of an LCP packet.
- */
- char *lcp_codenames[] = {
- "ConfReq", "ConfAck", "ConfNak", "ConfRej",
- "TermReq", "TermAck", "CodeRej", "ProtRej",
- "EchoReq", "EchoRep", "DiscReq"
- };
- int
- lcp_printpkt(p, plen, printer, arg)
- u_char *p;
- int plen;
- void (*printer) __ARGS((void *, char *, ...));
- void *arg;
- {
- int code, id, len, olen;
- u_char *pstart, *optend;
- u_short cishort;
- u_long cilong;
- if (plen < HEADERLEN)
- return 0;
- pstart = p;
- GETCHAR(code, p);
- GETCHAR(id, p);
- GETSHORT(len, p);
- if (len < HEADERLEN || len > plen)
- return 0;
- if (code >= 1 && code <= sizeof(lcp_codenames) / sizeof(char *))
- printer(arg, " %s", lcp_codenames[code-1]);
- else
- printer(arg, " code=0x%x", code);
- printer(arg, " id=0x%x", id);
- len -= HEADERLEN;
- switch (code) {
- case CONFREQ:
- case CONFACK:
- case CONFNAK:
- case CONFREJ:
- /* print option list */
- while (len >= 2) {
- GETCHAR(code, p);
- GETCHAR(olen, p);
- p -= 2;
- if (olen < 2 || olen > len) {
- break;
- }
- printer(arg, " <");
- len -= olen;
- optend = p + olen;
- switch (code) {
- case CI_MRU:
- if (olen == CILEN_SHORT) {
- p += 2;
- GETSHORT(cishort, p);
- printer(arg, "mru %d", cishort);
- }
- break;
- case CI_ASYNCMAP:
- if (olen == CILEN_LONG) {
- p += 2;
- GETLONG(cilong, p);
- printer(arg, "asyncmap 0x%x", cilong);
- }
- break;
- case CI_AUTHTYPE:
- if (olen >= CILEN_SHORT) {
- p += 2;
- printer(arg, "auth ");
- GETSHORT(cishort, p);
- switch (cishort) {
- case UPAP:
- printer(arg, "upap");
- break;
- case CHAP:
- printer(arg, "chap");
- break;
- default:
- printer(arg, "0x%x", cishort);
- }
- }
- break;
- case CI_QUALITY:
- if (olen >= CILEN_SHORT) {
- p += 2;
- printer(arg, "quality ");
- GETSHORT(cishort, p);
- switch (cishort) {
- case LQR:
- printer(arg, "lqr");
- break;
- default:
- printer(arg, "0x%x", cishort);
- }
- }
- break;
- case CI_MAGICNUMBER:
- if (olen == CILEN_LONG) {
- p += 2;
- GETLONG(cilong, p);
- printer(arg, "magic 0x%x", cilong);
- }
- break;
- case CI_PCOMPRESSION:
- if (olen == CILEN_VOID) {
- p += 2;
- printer(arg, "pcomp");
- }
- break;
- case CI_ACCOMPRESSION:
- if (olen == CILEN_VOID) {
- p += 2;
- printer(arg, "accomp");
- }
- break;
- }
- while (p < optend) {
- GETCHAR(code, p);
- printer(arg, " %.2x", code);
- }
- printer(arg, ">");
- }
- break;
- }
- /* print the rest of the bytes in the packet */
- for (; len > 0; --len) {
- GETCHAR(code, p);
- printer(arg, " %.2x", code);
- }
- return p - pstart;
- }
- /*
- * Time to shut down the link because there is nothing out there.
- */
- static
- void LcpLinkFailure (f)
- fsm *f;
- {
- if (f->state == OPENED) {
- syslog (LOG_NOTICE, "Excessive lack of response to LCP echo frames.");
- lcp_lowerdown(f->unit); /* Reset connection */
- ppp_if[f->unit]->phase = PHASE_TERMINATE;
- }
- }
- /*
- * Timer expired for the LCP echo requests from this process.
- */
- static void
- LcpEchoCheck (f)
- fsm *f;
- {
- u_long delta;
- #ifdef __linux__
- struct ppp_ddinfo ddinfo;
- u_long latest;
- /*
- * Read the time since the last packet was received.
- */
- if (ioctl (fd, PPPIOCGTIME, &ddinfo) < 0) {
- syslog (LOG_ERR, "ioctl(PPPIOCGTIME): %m");
- die (1);
- }
- /*
- * Choose the most recient frame received. It may be an IP or NON-IP frame.
- */
- latest = ddinfo.nip_rjiffies < ddinfo.ip_rjiffies ? ddinfo.nip_rjiffies
- : ddinfo.ip_rjiffies;
- /*
- * Compute the time since the last packet was received. If the timer
- * has expired then send the echo request and reset the timer to maximum.
- */
- delta = (lcp_echo_interval * HZ) - latest;
- if (delta < HZ || latest < 0L) {
- LcpSendEchoRequest (f);
- delta = lcp_echo_interval * HZ;
- }
- delta /= HZ;
- #else /* Other implementations do not have ability to find delta */
- LcpSendEchoRequest (f);
- delta = ppp_if[f->unit]->lcp_echo_interval;
- #endif
- /*
- * Start the timer for the next interval.
- */
- assert (ppp_if[f->unit]->lcp_echo_timer_running==0);
- PPP_TIMEOUT (LcpEchoTimeout, (caddr_t) f, delta);
- ppp_if[f->unit]->lcp_echo_timer_running = 1;
- }
- /*
- * LcpEchoTimeout - Timer expired on the LCP echo
- */
- static void
- LcpEchoTimeout (arg)
- caddr_t arg;
- {
- fsm *f = (fsm *)arg;
- if (ppp_if[f->unit]->lcp_echo_timer_running != 0) {
- ppp_if[f->unit]->lcp_echo_timer_running = 0;
- LcpEchoCheck ((fsm *) arg);
- }
- }
- /*
- * LcpEchoReply - LCP has received a reply to the echo
- */
- static void
- lcp_received_echo_reply (f, id, inp, len)
- fsm *f;
- int id; u_char *inp; int len;
- {
- u_long magic;
- /* Check the magic number - don't count replies from ourselves. */
- #ifdef notyet
- if (len < CILEN_LONG)
- return;
- #endif /* notyet */
- GETLONG(magic, inp);
- if (ppp_if[f->unit]->lcp_gotoptions.neg_magicnumber
- && magic == ppp_if[f->unit]->lcp_gotoptions.magicnumber)
- return;
- /* Reset the number of outstanding echo frames */
- ppp_if[f->unit]->lcp_echos_pending = 0;
- }
- /*
- * LcpSendEchoRequest - Send an echo request frame to the peer
- */
- static void
- LcpSendEchoRequest (f)
- fsm *f;
- {
- u_long lcp_magic;
- u_char pkt[4], *pktp;
- /*
- * Detect the failure of the peer at this point.
- */
- if (ppp_if[f->unit]->lcp_echo_fails != 0) {
- if (ppp_if[f->unit]->lcp_echos_pending++ >= ppp_if[f->unit]->lcp_echo_fails) {
- LcpLinkFailure(f);
- ppp_if[f->unit]->lcp_echos_pending = 0;
- die(f->unit, 1);
- }
- }
- /*
- * Make and send the echo request frame.
- */
- if (f->state == OPENED) {
- lcp_magic = ppp_if[f->unit]->lcp_gotoptions.neg_magicnumber
- ? ppp_if[f->unit]->lcp_gotoptions.magicnumber
- : 0L;
- pktp = pkt;
- PUTLONG(lcp_magic, pktp);
- fsm_sdata(f, ECHOREQ,
- ppp_if[f->unit]->lcp_echo_number++ & 0xFF, pkt, pktp - pkt);
- }
- }
- /*
- * lcp_echo_lowerup - Start the timer for the LCP frame
- */
- static void
- lcp_echo_lowerup (unit)
- int unit;
- {
- fsm *f = &ppp_if[unit]->lcp_fsm;
- /* Clear the parameters for generating echo frames */
- ppp_if[unit]->lcp_echos_pending = 0;
- ppp_if[unit]->lcp_echo_number = 0;
- ppp_if[unit]->lcp_echo_timer_running = 0;
- /* If a timeout interval is specified then start the timer */
- if (ppp_if[unit]->lcp_echo_interval != 0)
- LcpEchoCheck (f);
- }
- /*
- * lcp_echo_lowerdown - Stop the timer for the LCP frame
- */
- static void
- lcp_echo_lowerdown (unit)
- int unit;
- {
- fsm *f = &ppp_if[unit]->lcp_fsm;
- if (ppp_if[unit]->lcp_echo_timer_running != 0) {
- PPP_UNTIMEOUT (LcpEchoTimeout, (caddr_t) f);
- ppp_if[unit]->lcp_echo_timer_running = 0;
- }
- }