lcp.c
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- /*****************************************************************************
- * lcp.c - Network Link Control Protocol program file.
- *
- * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
- * portions Copyright (c) 1997 by Global Election Systems Inc.
- *
- * The authors hereby grant permission to use, copy, modify, distribute,
- * and license this software and its documentation for any purpose, provided
- * that existing copyright notices are retained in all copies and that this
- * notice and the following disclaimer are included verbatim in any
- * distributions. No written agreement, license, or royalty fee is required
- * for any of the authorized uses.
- *
- * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- ******************************************************************************
- * REVISION HISTORY
- *
- * 03-01-01 Marc Boucher <marc@mbsi.ca>
- * Ported to lwIP.
- * 97-12-01 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
- * Original.
- *****************************************************************************/
- /*
- * lcp.c - PPP Link Control Protocol.
- *
- * 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.
- */
-
- #include <string.h>
-
- #include "ppp.h"
- #if PPP_SUPPORT > 0
- #include "fsm.h"
- #include "chap.h"
- #include "magic.h"
- #include "auth.h"
- #include "lcp.h"
- #include "pppdebug.h"
- #include "timer.h"
- #include "uart.h"
- /*************************/
- /*** LOCAL DEFINITIONS ***/
- /*************************/
- /*
- * Length of each type of configuration option (in octets)
- */
- #define CILEN_VOID 2
- #define CILEN_CHAR 3
- #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 CILEN_CBCP 3
- /***********************************/
- /*** LOCAL FUNCTION DECLARATIONS ***/
- /***********************************/
- /*
- * Callbacks for fsm code. (CI = Configuration Information)
- */
- static void lcp_resetci (fsm*); /* Reset our CI */
- static int lcp_cilen (fsm*); /* Return length of our CI */
- static void lcp_addci (fsm*, u_char*, int*); /* Add our CI to pkt */
- static int lcp_ackci (fsm*, u_char*, int);/* Peer ack'd our CI */
- static int lcp_nakci (fsm*, u_char*, int);/* Peer nak'd our CI */
- static int lcp_rejci (fsm*, u_char*, int);/* Peer rej'd our CI */
- static int lcp_reqci (fsm*, u_char*, int*, int); /* Rcv peer CI */
- static void lcp_up (fsm*); /* We're UP */
- static void lcp_down (fsm*); /* We're DOWN */
- static void lcp_starting (fsm*); /* We need lower layer up */
- static void lcp_finished (fsm*); /* We need lower layer down */
- static int lcp_extcode (fsm*, int, u_char, u_char*, int);
- static void lcp_rprotrej (fsm*, u_char*, int);
- /*
- * routines to send LCP echos to peer
- */
- static void lcp_echo_lowerup (int);
- static void lcp_echo_lowerdown (int);
- static void LcpEchoTimeout (void*);
- static void lcp_received_echo_reply (fsm*, int, u_char*, int);
- static void LcpSendEchoRequest (fsm*);
- static void LcpLinkFailure (fsm*);
- static void LcpEchoCheck (fsm*);
- /*
- * Protocol entry points.
- * Some of these are called directly.
- */
- static void lcp_input (int, u_char *, int);
- static void lcp_protrej (int);
- #define CODENAME(x) ((x) == CONFACK ? "ACK" :
- (x) == CONFNAK ? "NAK" : "REJ")
- /******************************/
- /*** PUBLIC DATA STRUCTURES ***/
- /******************************/
- /* global vars */
- LinkPhase lcp_phase[NUM_PPP]; /* Phase of link session (RFC 1661) */
- lcp_options lcp_wantoptions[NUM_PPP]; /* Options that we want to request */
- lcp_options lcp_gotoptions[NUM_PPP]; /* Options that peer ack'd */
- lcp_options lcp_allowoptions[NUM_PPP]; /* Options we allow peer to request */
- lcp_options lcp_hisoptions[NUM_PPP]; /* Options that we ack'd */
- ext_accm xmit_accm[NUM_PPP]; /* extended transmit ACCM */
- /*****************************/
- /*** LOCAL DATA STRUCTURES ***/
- /*****************************/
- static fsm lcp_fsm[NUM_PPP]; /* LCP fsm structure (global)*/
- static u_int lcp_echo_interval = LCP_ECHOINTERVAL; /* Interval between LCP echo-requests */
- static u_int lcp_echo_fails = LCP_MAXECHOFAILS; /* Tolerance to unanswered echo-requests */
- static u32_t lcp_echos_pending = 0; /* Number of outstanding echo msgs */
- static u32_t lcp_echo_number = 0; /* ID number of next echo frame */
- static u32_t lcp_echo_timer_running = 0; /* TRUE if a timer is running */
- static u_char nak_buffer[PPP_MRU]; /* where we construct a nak packet */
- 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 */
- };
- struct protent lcp_protent = {
- PPP_LCP,
- lcp_init,
- lcp_input,
- lcp_protrej,
- lcp_lowerup,
- lcp_lowerdown,
- lcp_open,
- lcp_close,
- #if 0
- lcp_printpkt,
- NULL,
- #endif
- 1,
- "LCP",
- #if 0
- NULL,
- NULL,
- NULL
- #endif
- };
- int lcp_loopbackfail = DEFLOOPBACKFAIL;
- /*
- *return the state of ppp connect
- */
- BOOL ppp_dead(int pd)
- {
- if( lcp_phase[pd] == PHASE_DEAD)
- return TRUE;
- else
- return FALSE;
- }
- /***********************************/
- /*** PUBLIC FUNCTION DEFINITIONS ***/
- /***********************************/
- /*
- * lcp_init - Initialize LCP.
- */
- void lcp_init(int unit)
- {
- fsm *f = &lcp_fsm[unit];
- lcp_options *wo = &lcp_wantoptions[unit];
- lcp_options *ao = &lcp_allowoptions[unit];
-
- f->unit = unit;
- f->protocol = PPP_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 = PPP_DEFMRU;
- wo->neg_asyncmap = 1;
- wo->asyncmap = 0x00000000l; /* Assume don't need to escape any ctl chars. */
- 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 */
- wo->neg_cbcp = 0;
-
- ao->neg_mru = 1;
- ao->mru = PPP_MAXMRU;
- ao->neg_asyncmap = 1;
- ao->asyncmap = 0x00000000l; /* Assume don't need to escape any ctl chars. */
- ao->neg_chap = (CHAP_SUPPORT != 0);
- ao->chap_mdtype = CHAP_DIGEST_MD5;
- ao->neg_upap = (PAP_SUPPORT != 0);
- ao->neg_magicnumber = 1;
- ao->neg_pcompression = 1;
- ao->neg_accompression = 1;
- ao->neg_lqr = 0; /* no LQR implementation yet */
- ao->neg_cbcp = (CBCP_SUPPORT != 0);
- /*
- * Set transmit escape for the flag and escape characters plus anything
- * set for the allowable options.
- */
- memset(xmit_accm[unit], 0, sizeof(xmit_accm[0]));
- xmit_accm[unit][15] = 0x60;
- xmit_accm[unit][0] = (u_char)(ao->asyncmap & 0xFF);
- xmit_accm[unit][1] = (u_char)((ao->asyncmap >> 8) & 0xFF);
- xmit_accm[unit][2] = (u_char)((ao->asyncmap >> 16) & 0xFF);
- xmit_accm[unit][3] = (u_char)((ao->asyncmap >> 24) & 0xFF);
- LCPDEBUG((LOG_INFO, "lcp_init: xmit_accm=%X %X %X %Xn",
- xmit_accm[unit][0],
- xmit_accm[unit][1],
- xmit_accm[unit][2],
- xmit_accm[unit][3]));
-
- lcp_phase[unit] = PHASE_INITIALIZE;
- }
- /*
- * lcp_open - LCP is allowed to come up.
- */
- void lcp_open(int unit)
- {
- fsm *f = &lcp_fsm[unit];
- lcp_options *wo = &lcp_wantoptions[unit];
-
- f->flags = 0;
- if (wo->passive)
- f->flags |= OPT_PASSIVE;
- if (wo->silent)
- f->flags |= OPT_SILENT;
- fsm_open(f);
-
- lcp_phase[unit] = PHASE_ESTABLISH;
- }
- /*
- * lcp_close - Take LCP down.
- */
- void lcp_close(int unit, char *reason)
- {
- fsm *f = &lcp_fsm[unit];
-
- if (lcp_phase[unit] != PHASE_DEAD)
- lcp_phase[unit] = PHASE_TERMINATE;
- 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 an
- * lcp_close() in passive/silent mode when a connection hasn't
- * been established.
- */
- f->state = CLOSED;
- lcp_finished(f);
- }
- else
- fsm_close(&lcp_fsm[unit], reason);
- }
- /*
- * lcp_lowerup - The lower layer is up.
- */
- void lcp_lowerup(int unit)
- {
- lcp_options *wo = &lcp_wantoptions[unit];
-
- /*
- * Don't use A/C or protocol compression on transmission,
- * but accept A/C and protocol compressed packets
- * if we are going to ask for A/C and protocol compression.
- */
- ppp_set_xaccm(unit, &xmit_accm[unit]);
- ppp_send_config(unit, PPP_MRU, 0xffffffffl, 0, 0);
- ppp_recv_config(unit, PPP_MRU, 0x00000000l,
- wo->neg_pcompression, wo->neg_accompression);
- peer_mru[unit] = PPP_MRU;
- lcp_allowoptions[unit].asyncmap
- = (u_long)xmit_accm[unit][0]
- | ((u_long)xmit_accm[unit][1] << 8)
- | ((u_long)xmit_accm[unit][2] << 16)
- | ((u_long)xmit_accm[unit][3] << 24);
- LCPDEBUG((LOG_INFO, "lcp_lowerup: asyncmap=%X %X %X %Xn",
- xmit_accm[unit][3],
- xmit_accm[unit][2],
- xmit_accm[unit][1],
- xmit_accm[unit][0]));
-
- fsm_lowerup(&lcp_fsm[unit]);
- }
- /*
- * lcp_lowerdown - The lower layer is down.
- */
- void lcp_lowerdown(int unit)
- {
- fsm_lowerdown(&lcp_fsm[unit]);
- }
- /*
- * lcp_sprotrej - Send a Protocol-Reject for some protocol.
- */
- void lcp_sprotrej(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.
- */
- fsm_sdata(&lcp_fsm[unit], PROTREJ, ++lcp_fsm[unit].id,
- p, len);
- }
- /**********************************/
- /*** LOCAL FUNCTION DEFINITIONS ***/
- /**********************************/
- /*
- * lcp_input - Input LCP packet.
- */
- static void lcp_input(int unit, u_char *p, int len)
- {
- fsm *f = &lcp_fsm[unit];
-
- fsm_input(f, p, len);
- }
- /*
- * lcp_extcode - Handle a LCP-specific code.
- */
- static int lcp_extcode(fsm *f, int code, u_char 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 %dn", id));
- magp = inp;
- PUTLONG(lcp_gotoptions[f->unit].magicnumber, magp);
- 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(fsm *f, u_char *inp, int len)
- {
- int i;
- struct protent *protp;
- u_short prot;
-
- if (len < sizeof (u_short)) {
- LCPDEBUG((LOG_INFO,
- "lcp_rprotrej: Rcvd short Protocol-Reject packet!n"));
- return;
- }
-
- GETSHORT(prot, inp);
-
- LCPDEBUG((LOG_INFO,
- "lcp_rprotrej: Rcvd Protocol-Reject packet for %x!n",
- 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 %dn",
- f->state));
- return;
- }
-
- /*
- * Upcall the proper Protocol-Reject routine.
- */
- for (i = 0; (protp = ppp_protocols[i]) != NULL; ++i)
- if (protp->protocol == prot && protp->enabled_flag) {
- (*protp->protrej)(f->unit);
- return;
- }
-
- LCPDEBUG((LOG_WARNING, "Protocol-Reject for unsupported protocol 0x%xn",
- prot));
- }
- /*
- * lcp_protrej - A Protocol-Reject was received.
- */
- static void lcp_protrej(int unit)
- {
- (void)unit;
- /*
- * Can't reject LCP!
- */
- LCPDEBUG((LOG_WARNING,
- "lcp_protrej: Received Protocol-Reject for LCP!n"));
- fsm_protreject(&lcp_fsm[unit]);
- }
- /*
- * lcp_resetci - Reset our CI.
- */
- static void lcp_resetci(fsm *f)
- {
- lcp_wantoptions[f->unit].magicnumber = magic();
- lcp_wantoptions[f->unit].numloops = 0;
- lcp_gotoptions[f->unit] = lcp_wantoptions[f->unit];
- peer_mru[f->unit] = PPP_MRU;
- auth_reset(f->unit);
- }
- /*
- * lcp_cilen - Return length of our CI.
- */
- static int lcp_cilen(fsm *f)
- {
- lcp_options *go = &lcp_gotoptions[f->unit];
- #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)
- #define LENCICBCP(neg) ((neg) ? CILEN_CBCP: 0)
- /*
- * NB: we only ask for one of CHAP and UPAP, even if we will
- * accept either.
- */
- return (LENCISHORT(go->neg_mru && go->mru != PPP_DEFMRU) +
- //(LENCISHORT(go->neg_mru && go->mru == PPP_DEFMRU) +
- LENCILONG(go->neg_asyncmap && go->asyncmap != 0xFFFFFFFFl) +
- LENCICHAP(go->neg_chap) +
- LENCISHORT(!go->neg_chap && go->neg_upap) +
- LENCILQR(go->neg_lqr) +
- LENCICBCP(go->neg_cbcp) +
- 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(fsm *f, u_char *ucp, int *lenp)
- {
- lcp_options *go = &lcp_gotoptions[f->unit];
- u_char *start_ucp = ucp;
-
- #define ADDCIVOID(opt, neg)
- if (neg) {
- LCPDEBUG((LOG_INFO, "lcp_addci: opt=%dn", opt));
- PUTCHAR(opt, ucp);
- PUTCHAR(CILEN_VOID, ucp);
- }
- #define ADDCISHORT(opt, neg, val)
- if (neg) {
- LCPDEBUG((LOG_INFO, "lcp_addci: INT opt=%d %Xn", opt, val));
- PUTCHAR(opt, ucp);
- PUTCHAR(CILEN_SHORT, ucp);
- PUTSHORT(val, ucp);
- }
- #define ADDCICHAP(opt, neg, val, digest)
- if (neg) {
- LCPDEBUG((LOG_INFO, "lcp_addci: CHAP opt=%d %Xn", opt, val));
- PUTCHAR(opt, ucp);
- PUTCHAR(CILEN_CHAP, ucp);
- PUTSHORT(val, ucp);
- PUTCHAR(digest, ucp);
- }
- #define ADDCILONG(opt, neg, val)
- if (neg) {
- LCPDEBUG((LOG_INFO, "lcp_addci: L opt=%d %lXn", opt, val));
- PUTCHAR(opt, ucp);
- PUTCHAR(CILEN_LONG, ucp);
- PUTLONG(val, ucp);
- }
- #define ADDCILQR(opt, neg, val)
- if (neg) {
- LCPDEBUG((LOG_INFO, "lcp_addci: LQR opt=%d %lXn", opt, val));
- PUTCHAR(opt, ucp);
- PUTCHAR(CILEN_LQR, ucp);
- PUTSHORT(PPP_LQR, ucp);
- PUTLONG(val, ucp);
- }
- #define ADDCICHAR(opt, neg, val)
- if (neg) {
- LCPDEBUG((LOG_INFO, "lcp_addci: CHAR opt=%d %X '%z'n", opt, val, val));
- PUTCHAR(opt, ucp);
- PUTCHAR(CILEN_CHAR, ucp);
- PUTCHAR(val, ucp);
- }
-
- ADDCISHORT(CI_MRU, go->neg_mru && go->mru != PPP_DEFMRU, go->mru);
- //ADDCISHORT(CI_MRU, go->neg_mru && go->mru == PPP_DEFMRU, go->mru);
- ADDCILONG(CI_ASYNCMAP, go->neg_asyncmap && go->asyncmap != 0xFFFFFFFFl,
- go->asyncmap);
- ADDCICHAP(CI_AUTHTYPE, go->neg_chap, PPP_CHAP, go->chap_mdtype);
- ADDCISHORT(CI_AUTHTYPE, !go->neg_chap && go->neg_upap, PPP_PAP);
- ADDCILQR(CI_QUALITY, go->neg_lqr, go->lqr_period);
- ADDCICHAR(CI_CALLBACK, go->neg_cbcp, CBCP_OPT);
- 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 */
- LCPDEBUG((LOG_ERR, "Bug in lcp_addci: wrong lengthn"));
- }
- }
- /*
- * 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(fsm *f, u_char *p, int len)
- {
- lcp_options *go = &lcp_gotoptions[f->unit];
- u_char cilen, citype, cichar;
- u_short cishort;
- u32_t 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 != opt)
- goto bad;
- GETSHORT(cishort, p);
- if (cishort != val)
- goto bad;
- }
- #define ACKCICHAR(opt, neg, val)
- if (neg) {
- if ((len -= CILEN_CHAR) < 0)
- goto bad;
- GETCHAR(citype, p);
- GETCHAR(cilen, p);
- if (cilen != CILEN_CHAR ||
- citype != opt)
- goto bad;
- GETCHAR(cichar, p);
- if (cichar != 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 != opt)
- goto bad;
- GETSHORT(cishort, p);
- if (cishort != val)
- goto bad;
- GETCHAR(cichar, p);
- if (cichar != 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 != opt)
- goto bad;
- GETLONG(cilong, p);
- if (cilong != 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 != opt)
- goto bad;
- GETSHORT(cishort, p);
- if (cishort != PPP_LQR)
- goto bad;
- GETLONG(cilong, p);
- if (cilong != val)
- goto bad;
- }
-
- ACKCISHORT(CI_MRU, go->neg_mru && go->mru != PPP_DEFMRU, go->mru);
- ACKCILONG(CI_ASYNCMAP, go->neg_asyncmap && go->asyncmap != 0xFFFFFFFFl,
- go->asyncmap);
- ACKCICHAP(CI_AUTHTYPE, go->neg_chap, PPP_CHAP, go->chap_mdtype);
- ACKCISHORT(CI_AUTHTYPE, !go->neg_chap && go->neg_upap, PPP_PAP);
- ACKCILQR(CI_QUALITY, go->neg_lqr, go->lqr_period);
- ACKCICHAR(CI_CALLBACK, go->neg_cbcp, CBCP_OPT);
- 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;
- LCPDEBUG((LOG_INFO, "lcp_acki: Ackn"));
- return (1);
- bad:
- LCPDEBUG((LOG_WARNING, "lcp_acki: received bad Ack!n"));
- 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(fsm *f, u_char *p, int len)
- {
- lcp_options *go = &lcp_gotoptions[f->unit];
- lcp_options *wo = &lcp_wantoptions[f->unit];
- u_char citype, cichar, *next;
- u_short cishort;
- u32_t cilong;
- lcp_options no; /* options we've seen Naks for */
- lcp_options try; /* options to request next time */
- int looped_back = 0;
- int cilen;
-
- BZERO(&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 NAKCICHAR(opt, neg, code)
- if (go->neg &&
- len >= CILEN_CHAR &&
- p[1] == CILEN_CHAR &&
- p[0] == opt) {
- len -= CILEN_CHAR;
- INCPTR(2, 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.
- */
- if (go->neg_mru && go->mru != PPP_DEFMRU) {
- NAKCISHORT(CI_MRU, neg_mru,
- if (cishort <= wo->mru || cishort < PPP_DEFMRU)
- try.mru = cishort;
- );
- }
-
- /*
- * Add any characters they want to our (receive-side) asyncmap.
- */
- if (go->neg_asyncmap && go->asyncmap != 0xFFFFFFFFl) {
- NAKCILONG(CI_ASYNCMAP, neg_asyncmap,
- try.asyncmap = go->asyncmap | cilong;
- );
- }
-
- /*
- * If they've nak'd our authentication-protocol, check whether
- * they are proposing a different protocol, or a different
- * hash algorithm for CHAP.
- */
- if ((go->neg_chap || go->neg_upap)
- && len >= CILEN_SHORT
- && p[0] == CI_AUTHTYPE && p[1] >= CILEN_SHORT && p[1] <= len) {
- cilen = p[1];
- len -= cilen;
- no.neg_chap = go->neg_chap;
- no.neg_upap = go->neg_upap;
- INCPTR(2, p);
- GETSHORT(cishort, p);
- if (cishort == PPP_PAP && cilen == CILEN_SHORT) {
- /*
- * If we were asking for CHAP, they obviously don't want to do it.
- * If we weren't asking for CHAP, then we were asking for PAP,
- * in which case this Nak is bad.
- */
- if (!go->neg_chap)
- goto bad;
- try.neg_chap = 0;
-
- } else if (cishort == PPP_CHAP && cilen == CILEN_CHAP) {
- GETCHAR(cichar, p);
- if (go->neg_chap) {
- /*
- * We were asking for CHAP/MD5; they must want a different
- * algorithm. If they can't do MD5, we'll have to stop
- * asking for CHAP.
- */
- if (cichar != go->chap_mdtype)
- try.neg_chap = 0;
- } else {
- /*
- * Stop asking for PAP if we were asking for it.
- */
- try.neg_upap = 0;
- }
-
- } else {
- /*
- * We don't recognize what they're suggesting.
- * Stop asking for what we were asking for.
- */
- if (go->neg_chap)
- try.neg_chap = 0;
- else
- try.neg_upap = 0;
- p += cilen - CILEN_SHORT;
- }
- }
-
- /*
- * 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 != PPP_LQR)
- try.neg_lqr = 0;
- else
- try.lqr_period = cilong;
- );
-
- /*
- * Only implementing CBCP...not the rest of the callback options
- */
- NAKCICHAR(CI_CALLBACK, neg_cbcp,
- try.neg_cbcp = 0;
- );
-
- /*
- * Check for a looped-back line.
- */
- NAKCILONG(CI_MAGICNUMBER, neg_magicnumber,
- try.magicnumber = magic();
- looped_back = 1;
- );
-
- /*
- * Peer shouldn't send Nak for protocol compression or
- * address/control compression requests; they should send
- * a Reject instead. If they send a Nak, treat it as a Reject.
- */
- 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.
- * An option we don't recognize represents the peer asking to
- * negotiate some option we don't support, so ignore it.
- */
- while (len > CILEN_VOID) {
- GETCHAR(citype, p);
- GETCHAR(cilen, p);
- if (cilen < CILEN_VOID || (len -= cilen) < 0)
- goto bad;
- next = p + cilen - 2;
-
- switch (citype) {
- case CI_MRU:
- if ((go->neg_mru && go->mru != PPP_DEFMRU)
- || no.neg_mru || cilen != CILEN_SHORT)
- goto bad;
- GETSHORT(cishort, p);
- if (cishort < PPP_DEFMRU)
- try.mru = cishort;
- break;
- case CI_ASYNCMAP:
- if ((go->neg_asyncmap && go->asyncmap != 0xFFFFFFFFl)
- || 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;
- }
- 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) {
- if (looped_back) {
- if (++try.numloops >= lcp_loopbackfail) {
- LCPDEBUG((LOG_NOTICE, "Serial line is looped back.n"));
- lcp_close(f->unit, "Loopback detected");
- }
- }
- else
- try.numloops = 0;
- *go = try;
- }
-
- return 1;
-
- bad:
- LCPDEBUG((LOG_WARNING, "lcp_nakci: received bad Nak!n"));
- 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(fsm *f, u_char *p, int len)
- {
- lcp_options *go = &lcp_gotoptions[f->unit];
- u_char cichar;
- u_short cishort;
- u32_t cilong;
- 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: void opt %d rejectedn", 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 != val)
- goto bad;
- try.neg = 0;
- LCPDEBUG((LOG_INFO,"lcp_rejci: short opt %d rejectedn", 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 != val || cichar != digest)
- goto bad;
- try.neg = 0;
- try.neg_upap = 0;
- LCPDEBUG((LOG_INFO,"lcp_rejci: chap opt %d rejectedn", 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 != val)
- goto bad;
- try.neg = 0;
- LCPDEBUG((LOG_INFO,"lcp_rejci: long opt %d rejectedn", 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 != PPP_LQR || cilong != val)
- goto bad;
- try.neg = 0;
- LCPDEBUG((LOG_INFO,"lcp_rejci: LQR opt %d rejectedn", opt));
- }
- #define REJCICBCP(opt, neg, val)
- if (go->neg &&
- len >= CILEN_CBCP &&
- p[1] == CILEN_CBCP &&
- p[0] == opt) {
- len -= CILEN_CBCP;
- INCPTR(2, p);
- GETCHAR(cichar, p);
- /* Check rejected value. */
- if (cichar != val)
- goto bad;
- try.neg = 0;
- LCPDEBUG((LOG_INFO,"lcp_rejci: Callback opt %d rejectedn", opt));
- }
-
- REJCISHORT(CI_MRU, neg_mru, go->mru);
- REJCILONG(CI_ASYNCMAP, neg_asyncmap, go->asyncmap);
- REJCICHAP(CI_AUTHTYPE, neg_chap, PPP_CHAP, go->chap_mdtype);
- if (!go->neg_chap) {
- REJCISHORT(CI_AUTHTYPE, neg_upap, PPP_PAP);
- }
- REJCILQR(CI_QUALITY, neg_lqr, go->lqr_period);
- REJCICBCP(CI_CALLBACK, neg_cbcp, CBCP_OPT);
- 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!n"));
- 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(fsm *f,
- u_char *inp, /* Requested CIs */
- int *lenp, /* Length of requested CIs */
- int reject_if_disagree)
- {
- lcp_options *go = &lcp_gotoptions[f->unit];
- lcp_options *ho = &lcp_hisoptions[f->unit];
- lcp_options *ao = &lcp_allowoptions[f->unit];
- u_char *cip, *next; /* Pointer to current and next CIs */
- int cilen, citype, cichar; /* Parsed len, type, char value */
- u_short cishort; /* Parsed short value */
- u32_t 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 */
- #if TRACELCP > 0
- char traceBuf[80];
- int traceNdx = 0;
- #endif
-
- /*
- * Reset all his options.
- */
- BZERO(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!n"));
- orc = CONFREJ; /* Reject bad CI */
- cilen = l; /* Reject till end of packet */
- l = 0; /* Don't loop again */
- citype = 0;
- 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:
- if (!ao->neg_mru) { /* Allow option? */
- LCPDEBUG((LOG_INFO, "lcp_reqci: Reject MRU - not allowedn"));
- orc = CONFREJ; /* Reject CI */
- break;
- } else if (cilen != CILEN_SHORT) { /* Check CI length */
- LCPDEBUG((LOG_INFO, "lcp_reqci: Reject MRU - bad lengthn"));
- orc = CONFREJ; /* Reject CI */
- break;
- }
- GETSHORT(cishort, p); /* Parse MRU */
-
- /*
- * 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 < PPP_MINMRU) {
- LCPDEBUG((LOG_INFO, "lcp_reqci: Nak - MRU too smalln"));
- orc = CONFNAK; /* Nak CI */
- PUTCHAR(CI_MRU, nakp);
- PUTCHAR(CILEN_SHORT, nakp);
- PUTSHORT(PPP_MINMRU, nakp); /* Give him a hint */
- break;
- }
- ho->neg_mru = 1; /* Remember he sent MRU */
- ho->mru = cishort; /* And remember value */
- #if TRACELCP > 0
- sprintf(&traceBuf[traceNdx], " MRU %d", cishort);
- traceNdx = strlen(traceBuf);
- #endif
- break;
-
- case CI_ASYNCMAP:
- if (!ao->neg_asyncmap) {
- LCPDEBUG((LOG_INFO, "lcp_reqci: Reject ASYNCMAP not allowedn"));
- orc = CONFREJ;
- break;
- } else if (cilen != CILEN_LONG) {
- LCPDEBUG((LOG_INFO, "lcp_reqci: Reject ASYNCMAP bad lengthn"));
- orc = CONFREJ;
- break;
- }
- GETLONG(cilong, p);
-
- /*
- * Asyncmap must have set at least the bits
- * which are set in lcp_allowoptions[unit].asyncmap.
- */
- if ((ao->asyncmap & ~cilong) != 0) {
- LCPDEBUG((LOG_INFO, "lcp_reqci: Nak ASYNCMAP %lX missing %lXn",
- cilong, ao->asyncmap));
- orc = CONFNAK;
- PUTCHAR(CI_ASYNCMAP, nakp);
- PUTCHAR(CILEN_LONG, nakp);
- PUTLONG(ao->asyncmap | cilong, nakp);
- break;
- }
- ho->neg_asyncmap = 1;
- ho->asyncmap = cilong;
- #if TRACELCP > 0
- sprintf(&traceBuf[traceNdx], " ASYNCMAP=%lX", cilong);
- traceNdx = strlen(traceBuf);
- #endif
- break;
-
- case CI_AUTHTYPE:
- if (cilen < CILEN_SHORT) {
- LCPDEBUG((LOG_INFO, "lcp_reqci: Reject AUTHTYPE missing argn"));
- orc = CONFREJ;
- break;
- } else if (!(ao->neg_upap || ao->neg_chap)) {
- /*
- * Reject the option if we're not willing to authenticate.
- */
- LCPDEBUG((LOG_INFO, "lcp_reqci: Reject AUTHTYPE not allowedn"));
- orc = CONFREJ;
- break;
- }
- GETSHORT(cishort, p);
-
- /*
- * 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 == PPP_PAP) {
- if (ho->neg_chap) { /* we've already accepted CHAP */
- LCPDEBUG((LOG_WARNING, "lcp_reqci: Reject AUTHTYPE PAP already acceptedn"));
- orc = CONFREJ;
- break;
- } else if (cilen != CILEN_SHORT) {
- LCPDEBUG((LOG_WARNING, "lcp_reqci: Reject AUTHTYPE PAP bad lenn"));
- orc = CONFREJ;
- break;
- }
- if (!ao->neg_upap) { /* we don't want to do PAP */
- LCPDEBUG((LOG_WARNING, "lcp_reqci: Nak AUTHTYPE PAP not allowedn"));
- orc = CONFNAK; /* NAK it and suggest CHAP */
- PUTCHAR(CI_AUTHTYPE, nakp);
- PUTCHAR(CILEN_CHAP, nakp);
- PUTSHORT(PPP_CHAP, nakp);
- PUTCHAR(ao->chap_mdtype, nakp);
- break;
- }
- ho->neg_upap = 1;
- #if TRACELCP > 0
- sprintf(&traceBuf[traceNdx], " PAP (%X)", cishort);
- traceNdx = strlen(traceBuf);
- #endif
- break;
- }
- if (cishort == PPP_CHAP) {
- if (ho->neg_upap) { /* we've already accepted PAP */
- LCPDEBUG((LOG_WARNING, "lcp_reqci: Reject AUTHTYPE CHAP accepted PAPn"));
- orc = CONFREJ;
- break;
- } else if (cilen != CILEN_CHAP) {
- LCPDEBUG((LOG_WARNING, "lcp_reqci: Reject AUTHTYPE CHAP bad lenn"));
- orc = CONFREJ;
- break;
- }
- if (!ao->neg_chap) { /* we don't want to do CHAP */
- LCPDEBUG((LOG_WARNING, "lcp_reqci: Nak AUTHTYPE CHAP not allowedn"));
- orc = CONFNAK; /* NAK it and suggest PAP */
- PUTCHAR(CI_AUTHTYPE, nakp);
- PUTCHAR(CILEN_SHORT, nakp);
- PUTSHORT(PPP_PAP, nakp);
- break;
- }
- GETCHAR(cichar, p); /* get digest type*/
- if (cichar != CHAP_DIGEST_MD5
- #ifdef CHAPMS
- && cichar != CHAP_MICROSOFT
- #endif
- ) {
- LCPDEBUG((LOG_WARNING, "lcp_reqci: Nak AUTHTYPE CHAP digest=%dn", cichar));
- orc = CONFNAK;
- PUTCHAR(CI_AUTHTYPE, nakp);
- PUTCHAR(CILEN_CHAP, nakp);
- PUTSHORT(PPP_CHAP, nakp);
- PUTCHAR(ao->chap_mdtype, nakp);
- break;
- }
- #if TRACELCP > 0
- sprintf(&traceBuf[traceNdx], " CHAP %X,%d", cishort, cichar);
- traceNdx = strlen(traceBuf);
- #endif
- 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) {
- LCPDEBUG((LOG_WARNING, "lcp_reqci: Nak AUTHTYPE %d req CHAPn", cishort));
- PUTCHAR(CILEN_CHAP, nakp);
- PUTSHORT(PPP_CHAP, nakp);
- PUTCHAR(ao->chap_mdtype, nakp);
- }
- else {
- LCPDEBUG((LOG_WARNING, "lcp_reqci: Nak AUTHTYPE %d req PAPn", cishort));
- PUTCHAR(CILEN_SHORT, nakp);
- PUTSHORT(PPP_PAP, nakp);
- }
- break;
-
- case CI_QUALITY:
- GETSHORT(cishort, p);
- GETLONG(cilong, p);
- #if TRACELCP > 0
- sprintf(&traceBuf[traceNdx], " QUALITY (%x %x)", cishort, (unsigned int) cilong);
- traceNdx = strlen(traceBuf);
- #endif
- if (!ao->neg_lqr ||
- cilen != CILEN_LQR) {
- orc = CONFREJ;
- break;
- }
-
- /*
- * Check the protocol and the reporting period.
- * XXX When should we Nak this, and what with?
- */
- if (cishort != PPP_LQR) {
- orc = CONFNAK;
- PUTCHAR(CI_QUALITY, nakp);
- PUTCHAR(CILEN_LQR, nakp);
- PUTSHORT(PPP_LQR, nakp);
- PUTLONG(ao->lqr_period, nakp);
- break;
- }
- break;
-
- case CI_MAGICNUMBER:
- if (!(ao->neg_magicnumber || go->neg_magicnumber) ||
- cilen != CILEN_LONG) {
- orc = CONFREJ;
- break;
- }
- GETLONG(cilong, p);
- #if TRACELCP > 0
- sprintf(&traceBuf[traceNdx], " MAGICNUMBER (%lX)", cilong);
- traceNdx = strlen(traceBuf);
- #endif
- /*
- * He must have a different magic number.
- */
- if (go->neg_magicnumber &&
- cilong == go->magicnumber) {
- 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:
- #if TRACELCP > 0
- sprintf(&traceBuf[traceNdx], " PCOMPRESSION");
- traceNdx = strlen(traceBuf);
- #endif
- if (!ao->neg_pcompression ||
- cilen != CILEN_VOID) {
- orc = CONFREJ;
- break;
- }
- ho->neg_pcompression = 1;
- break;
-
- case CI_ACCOMPRESSION:
- #if TRACELCP > 0
- sprintf(&traceBuf[traceNdx], " ACCOMPRESSION");
- traceNdx = strlen(traceBuf);
- #endif
- if (!ao->neg_accompression ||
- cilen != CILEN_VOID) {
- orc = CONFREJ;
- break;
- }
- ho->neg_accompression = 1;
- break;
-
- case CI_MRRU:
- #if TRACELCP > 0
- sprintf(&traceBuf[traceNdx], " CI_MRRU");
- traceNdx = strlen(traceBuf);
- #endif
- orc = CONFREJ;
- break;
-
- case CI_SSNHF:
- #if TRACELCP > 0
- sprintf(&traceBuf[traceNdx], " CI_SSNHF");
- traceNdx = strlen(traceBuf);
- #endif
- orc = CONFREJ;
- break;
-
- case CI_EPDISC:
- #if TRACELCP > 0
- sprintf(&traceBuf[traceNdx], " CI_EPDISC");
- traceNdx = strlen(traceBuf);
- #endif
- orc = CONFREJ;
- break;
-
- default:
- #if TRACELCP
- sprintf(&traceBuf[traceNdx], " unknown %d", citype);
- traceNdx = strlen(traceBuf);
- #endif
- orc = CONFREJ;
- break;
- }
-
- endswitch:
- #if TRACELCP
- if (traceNdx >= 80 - 32) {
- LCPDEBUG((LOG_INFO, "lcp_reqci: rcvd%sn", traceBuf));
- traceNdx = 0;
- }
- #endif
- 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 = (int)(next - inp);
- break;
- case CONFNAK:
- /*
- * Copy the Nak'd options from the nak_buffer to the caller's buffer.
- */
- *lenp = (int)(nakp - nak_buffer);
- BCOPY(nak_buffer, inp, *lenp);
- break;
- case CONFREJ:
- *lenp = (int)(rejp - inp);
- break;
- }
-
- #if TRACELCP > 0
- if (traceNdx > 0) {
- LCPDEBUG((LOG_INFO, "lcp_reqci: %sn", traceBuf));
- }
- #endif
- LCPDEBUG((LOG_INFO, "lcp_reqci: returning CONF%s.n", CODENAME(rc)));
- return (rc); /* Return final code */
- }
- /*
- * lcp_up - LCP has come UP.
- */
- static void lcp_up(fsm *f)
- {
- lcp_options *wo = &lcp_wantoptions[f->unit];
- lcp_options *ho = &lcp_hisoptions[f->unit];
- lcp_options *go = &lcp_gotoptions[f->unit];
- lcp_options *ao = &lcp_allowoptions[f->unit];
- DEBUG_FUNCTION("lcp_up()");
-
- 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, LWIP_MIN(ao->mru, (ho->neg_mru? ho->mru: PPP_MRU)),
- (ho->neg_asyncmap? ho->asyncmap: 0xffffffffl),
- 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? LWIP_MAX(wo->mru, go->mru): PPP_MRU),
- (go->neg_asyncmap? go->asyncmap: 0x00000000),
- go->neg_pcompression, go->neg_accompression);
-
- if (ho->neg_mru)
- peer_mru[f->unit] = ho->mru;
-
- 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(fsm *f)
- {
- lcp_options *go = &lcp_gotoptions[f->unit];
-
- lcp_echo_lowerdown(f->unit);
-
- link_down(f->unit);
-
- ppp_send_config(f->unit, PPP_MRU, 0xffffffffl, 0, 0);
- ppp_recv_config(f->unit, PPP_MRU,
- (go->neg_asyncmap? go->asyncmap: 0x00000000),
- go->neg_pcompression, go->neg_accompression);
- peer_mru[f->unit] = PPP_MRU;
- }
- /*
- * lcp_starting - LCP needs the lower layer up.
- */
- static void lcp_starting(fsm *f)
- {
- link_required(f->unit);
- }
- /*
- * lcp_finished - LCP has finished with the lower layer.
- */
- static void lcp_finished(fsm *f)
- {
- link_terminated(f->unit);
- }
- #if 0
- /*
- * print_string - print a readable representation of a string using
- * printer.
- */
- static void print_string(
- char *p,
- int len,
- void (*printer) (void *, char *, ...),
- void *arg
- )
- {
- int c;
-
- printer(arg, """);
- for (; len > 0; --len) {
- c = *p++;
- if (' ' <= c && c <= '~') {
- if (c == '\' || c == '"')
- printer(arg, "\");
- printer(arg, "%c", c);
- } else {
- switch (c) {
- case 'n':
- printer(arg, "\n");
- break;
- case 'r':
- printer(arg, "\r");
- break;
- case 't':
- printer(arg, "\t");
- break;
- default:
- printer(arg, "\%.3o", c);
- }
- }
- }
- printer(arg, """);
- }
- /*
- * lcp_printpkt - print the contents of an LCP packet.
- */
- static char *lcp_codenames[] = {
- "ConfReq", "ConfAck", "ConfNak", "ConfRej",
- "TermReq", "TermAck", "CodeRej", "ProtRej",
- "EchoReq", "EchoRep", "DiscReq"
- };
- static int lcp_printpkt(
- u_char *p,
- int plen,
- void (*printer) (void *, char *, ...),
- void *arg
- )
- {
- int code, id, len, olen;
- u_char *pstart, *optend;
- u_short cishort;
- u32_t 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%lx", cilong);
- }
- break;
- case CI_AUTHTYPE:
- if (olen >= CILEN_SHORT) {
- p += 2;
- printer(arg, "auth ");
- GETSHORT(cishort, p);
- switch (cishort) {
- case PPP_PAP:
- printer(arg, "pap");
- break;
- case PPP_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 PPP_LQR:
- printer(arg, "lqr");
- break;
- default:
- printer(arg, "0x%x", cishort);
- }
- }
- break;
- case CI_CALLBACK:
- if (olen >= CILEN_CHAR) {
- p += 2;
- printer(arg, "callback ");
- GETSHORT(cishort, p);
- switch (cishort) {
- case CBCP_OPT:
- printer(arg, "CBCP");
- 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;
-
- case TERMACK:
- case TERMREQ:
- if (len > 0 && *p >= ' ' && *p < 0x7f) {
- printer(arg, " ");
- print_string((char*)p, len, printer, arg);
- p += len;
- len = 0;
- }
- break;
-
- case ECHOREQ:
- case ECHOREP:
- case DISCREQ:
- if (len >= 4) {
- GETLONG(cilong, p);
- printer(arg, " magic=0x%x", cilong);
- p += 4;
- len -= 4;
- }
- break;
- }
-
- /* print the rest of the bytes in the packet */
- for (; len > 0; --len) {
- GETCHAR(code, p);
- printer(arg, " %.2x", code);
- }
-
- return (int)(p - pstart);
- }
- #endif
- /*
- * Time to shut down the link because there is nothing out there.
- */
- static void LcpLinkFailure (fsm *f)
- {
- if (f->state == OPENED) {
- LCPDEBUG((LOG_INFO, "No response to %d echo-requestsn", lcp_echos_pending));
- LCPDEBUG((LOG_NOTICE, "Serial link appears to be disconnected.n"));
- lcp_close(f->unit, "Peer not responding");
- }
- }
- /*
- * Timer expired for the LCP echo requests from this process.
- */
- static void LcpEchoCheck (fsm *f)
- {
- LcpSendEchoRequest (f);
-
- /*
- * Start the timer for the next interval.
- */
- LWIP_ASSERT("lcp_echo_timer_running == 0", lcp_echo_timer_running == 0);
- TIMEOUT (LcpEchoTimeout, f, lcp_echo_interval);
- lcp_echo_timer_running = 1;
- }
- /*
- * LcpEchoTimeout - Timer expired on the LCP echo
- */
- static void LcpEchoTimeout (void *arg)
- {
- if (lcp_echo_timer_running != 0) {
- lcp_echo_timer_running = 0;
- LcpEchoCheck ((fsm *) arg);
- }
- }
- /*
- * LcpEchoReply - LCP has received a reply to the echo
- */
- static void lcp_received_echo_reply (fsm *f, int id, u_char *inp, int len)
- {
- u32_t magic;
-
- (void)id;
- /* Check the magic number - don't count replies from ourselves. */
- if (len < 4) {
- LCPDEBUG((LOG_WARNING, "lcp: received short Echo-Reply, length %dn", len));
- return;
- }
- GETLONG(magic, inp);
- if (lcp_gotoptions[f->unit].neg_magicnumber
- && magic == lcp_gotoptions[f->unit].magicnumber) {
- LCPDEBUG((LOG_WARNING, "appear to have received our own echo-reply!n"));
- return;
- }
-
- /* Reset the number of outstanding echo frames */
- lcp_echos_pending = 0;
- }
- /*
- * LcpSendEchoRequest - Send an echo request frame to the peer
- */
- static void LcpSendEchoRequest (fsm *f)
- {
- u32_t lcp_magic;
- u_char pkt[4], *pktp;
-
- /*
- * Detect the failure of the peer at this point.
- */
- if (lcp_echo_fails != 0) {
- if (lcp_echos_pending++ >= lcp_echo_fails) {
- LcpLinkFailure(f);
- lcp_echos_pending = 0;
- }
- }
-
- /*
- * Make and send the echo request frame.
- */
- if (f->state == OPENED) {
- lcp_magic = lcp_gotoptions[f->unit].magicnumber;
- pktp = pkt;
- PUTLONG(lcp_magic, pktp);
- fsm_sdata(f, ECHOREQ, (u_char)(lcp_echo_number++ & 0xFF), pkt, (int)(pktp - pkt));
- }
- }
- /*
- * lcp_echo_lowerup - Start the timer for the LCP frame
- */
- static void lcp_echo_lowerup (int unit)
- {
- fsm *f = &lcp_fsm[unit];
-
- /* Clear the parameters for generating echo frames */
- lcp_echos_pending = 0;
- lcp_echo_number = 0;
- lcp_echo_timer_running = 0;
-
- /* If a timeout interval is specified then start the timer */
- if (lcp_echo_interval != 0)
- LcpEchoCheck (f);
- }
- /*
- * lcp_echo_lowerdown - Stop the timer for the LCP frame
- */
- static void lcp_echo_lowerdown (int unit)
- {
- fsm *f = &lcp_fsm[unit];
-
- if (lcp_echo_timer_running != 0) {
- UNTIMEOUT (LcpEchoTimeout, f);
- lcp_echo_timer_running = 0;
- }
- }
- #endif /* PPP_SUPPORT */