X-Git-Url: http://git.ozlabs.org/?p=ppp.git;a=blobdiff_plain;f=pppd%2Flcp.c;h=c8c27ac2df1dc4adb0472b909b3bba792670cfe1;hp=c475f4ce97c3ea3d3b0cd55906cb6763ffa30587;hb=1db7d0c85cfe5d28162f7f8f1e6dc9f76812335d;hpb=0b63a24d54ba4708c88e31bdd74b0145956c1478 diff --git a/pppd/lcp.c b/pppd/lcp.c index c475f4c..c8c27ac 100644 --- a/pppd/lcp.c +++ b/pppd/lcp.c @@ -18,30 +18,24 @@ */ #ifndef lint -static char rcsid[] = "$Id: lcp.c,v 1.1 1993/11/11 03:54:25 paulus Exp $"; +static char rcsid[] = "$Id: lcp.c,v 1.15 1994/10/24 04:31:11 paulus Exp $"; #endif /* * TODO: - * Option tracing. - * Test restart. */ #include +#include #include +#include #include #include #include #include - -#include -#include #include -#include - #include "pppd.h" -#include "ppp.h" #include "fsm.h" #include "lcp.h" #include "magic.h" @@ -49,29 +43,49 @@ static char rcsid[] = "$Id: lcp.c,v 1.1 1993/11/11 03:54:25 paulus Exp $"; #include "upap.h" #include "ipcp.h" +#ifdef _linux_ /* Needs ppp ioctls */ +#include +#endif + /* global vars */ -fsm lcp_fsm[NPPP]; /* LCP fsm structure (global)*/ -lcp_options lcp_wantoptions[NPPP]; /* Options that we want to request */ -lcp_options lcp_gotoptions[NPPP]; /* Options that peer ack'd */ -lcp_options lcp_allowoptions[NPPP]; /* Options we allow peer to request */ -lcp_options lcp_hisoptions[NPPP]; /* Options that we ack'd */ +fsm lcp_fsm[NUM_PPP]; /* LCP fsm structure (global)*/ +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 */ +u_int32_t xmit_accm[NUM_PPP][8]; /* extended transmit ACCM */ + +static u_int32_t lcp_echos_pending = 0; /* Number of outstanding echo msgs */ +static u_int32_t lcp_echo_number = 0; /* ID number of next echo frame */ +static u_int32_t lcp_echo_timer_running = 0; /* TRUE if a timer is running */ /* * 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)); +static void lcp_resetci __P((fsm *)); /* Reset our CI */ +static int lcp_cilen __P((fsm *)); /* Return length of our CI */ +static void lcp_addci __P((fsm *, u_char *, int *)); /* Add our CI to pkt */ +static int lcp_ackci __P((fsm *, u_char *, int)); /* Peer ack'd our CI */ +static int lcp_nakci __P((fsm *, u_char *, int)); /* Peer nak'd our CI */ +static int lcp_rejci __P((fsm *, u_char *, int)); /* Peer rej'd our CI */ +static int lcp_reqci __P((fsm *, u_char *, int *, int)); /* Rcv peer CI */ +static void lcp_up __P((fsm *)); /* We're UP */ +static void lcp_down __P((fsm *)); /* We're DOWN */ +static void lcp_starting __P((fsm *)); /* We need lower layer up */ +static void lcp_finished __P((fsm *)); /* We need lower layer down */ +static int lcp_extcode __P((fsm *, int, int, u_char *, int)); +static void lcp_rprotrej __P((fsm *, u_char *, int)); + +/* + * routines to send LCP echos to peer + */ + +static void lcp_echo_lowerup __P((int)); +static void lcp_echo_lowerdown __P((int)); +static void LcpEchoTimeout __P((caddr_t)); +static void lcp_received_echo_reply __P((fsm *, int, u_char *, int)); +static void LcpSendEchoRequest __P((fsm *)); +static void LcpLinkFailure __P((fsm *)); static fsm_callbacks lcp_callbacks = { /* LCP callback routines */ lcp_resetci, /* Reset our Configuration Information */ @@ -118,7 +132,7 @@ lcp_init(unit) lcp_options *ao = &lcp_allowoptions[unit]; f->unit = unit; - f->protocol = LCP; + f->protocol = PPP_LCP; f->callbacks = &lcp_callbacks; fsm_init(f); @@ -129,7 +143,7 @@ lcp_init(unit) implementations */ wo->neg_mru = 1; wo->mru = DEFMRU; - wo->neg_asyncmap = 1; + 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 */ @@ -151,6 +165,8 @@ lcp_init(unit) ao->neg_accompression = 1; ao->neg_lqr = 0; /* no LQR implementation yet */ + memset(xmit_accm[unit], 0, sizeof(xmit_accm[0])); + xmit_accm[unit][3] = 0x60000000; } @@ -180,7 +196,20 @@ void lcp_close(unit) int unit; { - fsm_close(&lcp_fsm[unit]); + fsm *f = &lcp_fsm[unit]; + + 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(&lcp_fsm[unit]); } @@ -192,9 +221,11 @@ lcp_lowerup(unit) int unit; { sifdown(unit); - ppp_send_config(unit, MTU, 0xffffffff, 0, 0); - ppp_recv_config(unit, MTU, 0, 0, 0); - peer_mru[unit] = MTU; + ppp_set_xaccm(unit, xmit_accm[unit]); + ppp_send_config(unit, PPP_MRU, 0xffffffff, 0, 0); + ppp_recv_config(unit, PPP_MRU, 0x00000000, 0, 0); + peer_mru[unit] = PPP_MRU; + lcp_allowoptions[unit].asyncmap = xmit_accm[unit][0]; fsm_lowerup(&lcp_fsm[unit]); } @@ -220,7 +251,23 @@ lcp_input(unit, p, len) u_char *p; int len; { - fsm_input(&lcp_fsm[unit], p, len); + int oldstate; + fsm *f = &lcp_fsm[unit]; + lcp_options *go = &lcp_gotoptions[f->unit]; + + oldstate = f->state; + fsm_input(f, p, len); + if (oldstate == REQSENT && f->state == ACKSENT) { + /* + * The peer will probably send us an ack soon and then + * immediately start sending packets with the negotiated + * options. So as to be ready when that happens, we set + * our receive side to accept packets as negotiated now. + */ + ppp_recv_config(f->unit, PPP_MRU, + go->neg_asyncmap? go->asyncmap: 0x00000000, + go->neg_pcompression, go->neg_accompression); + } } @@ -234,19 +281,26 @@ lcp_extcode(f, code, id, inp, len) u_char *inp; int len; { + u_char *magp; + switch( code ){ case PROTREJ: lcp_rprotrej(f, inp, len); break; case ECHOREQ: - if( f->state != OPENED ) + if (f->state != OPENED) break; LCPDEBUG((LOG_INFO, "lcp: Echo-Request, Rcvd id %d", 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; @@ -346,7 +400,7 @@ 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] = MTU; + peer_mru[f->unit] = PPP_MRU; } @@ -419,14 +473,14 @@ lcp_addci(f, ucp, lenp) if (neg) { \ PUTCHAR(opt, ucp); \ PUTCHAR(CILEN_LQR, ucp); \ - PUTSHORT(LQR, ucp); \ + PUTSHORT(PPP_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); + 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); ADDCILONG(CI_MAGICNUMBER, go->neg_magicnumber, go->magicnumber); ADDCIVOID(CI_PCOMPRESSION, go->neg_pcompression); @@ -456,7 +510,7 @@ lcp_ackci(f, p, len) lcp_options *go = &lcp_gotoptions[f->unit]; u_char cilen, citype, cichar; u_short cishort; - u_long cilong; + u_int32_t cilong; /* * CIs must be in exactly the same order that we sent. @@ -525,7 +579,7 @@ lcp_ackci(f, p, len) citype != opt) \ goto bad; \ GETSHORT(cishort, p); \ - if (cishort != LQR) \ + if (cishort != PPP_LQR) \ goto bad; \ GETLONG(cilong, p); \ if (cilong != val) \ @@ -534,8 +588,8 @@ lcp_ackci(f, p, len) 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); + 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); ACKCILONG(CI_MAGICNUMBER, go->neg_magicnumber, go->magicnumber); ACKCIVOID(CI_PCOMPRESSION, go->neg_pcompression); @@ -572,7 +626,7 @@ lcp_nakci(f, p, len) lcp_options *wo = &lcp_wantoptions[f->unit]; u_char cilen, citype, cichar, *next; u_short cishort; - u_long cilong; + u_int32_t cilong; lcp_options no; /* options we've seen Naks for */ lcp_options try; /* options to request next time */ int looped_back = 0; @@ -681,12 +735,12 @@ lcp_nakci(f, p, len) * to stop asking for LQR. We haven't got any other protocol. * If they Nak the reporting period, take their value XXX ? */ - NAKCILONG(CI_QUALITY, neg_lqr, - if (cishort != LQR) - try.neg_lqr = 0; - else - try.lqr_period = cilong; - ); + NAKCILQR(CI_QUALITY, neg_lqr, + if (cishort != PPP_LQR) + try.neg_lqr = 0; + else + try.lqr_period = cilong; + ); /* * Check for a looped-back line. */ @@ -772,7 +826,7 @@ lcp_nakci(f, p, len) if (f->state != OPENED) { *go = try; if (looped_back && try.numloops % lcp_warnloops == 0) - LCPDEBUG((LOG_INFO, "The line appears to be looped back.")); + syslog(LOG_WARNING, "Serial line appears to be looped back."); } return 1; @@ -801,7 +855,7 @@ lcp_rejci(f, p, len) lcp_options *go = &lcp_gotoptions[f->unit]; u_char cichar; u_short cishort; - u_long cilong; + u_int32_t cilong; u_char *start = p; int plen = len; lcp_options try; /* options to request next time */ @@ -876,7 +930,7 @@ lcp_rejci(f, p, len) GETSHORT(cishort, p); \ GETLONG(cilong, p); \ /* Check rejected value. */ \ - if (cishort != LQR || cichar != val) \ + if (cishort != PPP_LQR || cilong != val) \ goto bad; \ try.neg = 0; \ LCPDEBUG((LOG_INFO,"lcp_rejci rejected LQR opt %d", opt)); \ @@ -884,9 +938,9 @@ lcp_rejci(f, p, len) REJCISHORT(CI_MRU, neg_mru, go->mru); REJCILONG(CI_ASYNCMAP, neg_asyncmap, go->asyncmap); - REJCICHAP(CI_AUTHTYPE, neg_chap, CHAP, go->chap_mdtype); + REJCICHAP(CI_AUTHTYPE, neg_chap, PPP_CHAP, go->chap_mdtype); if (!go->neg_chap) { - REJCISHORT(CI_AUTHTYPE, neg_upap, UPAP); + REJCISHORT(CI_AUTHTYPE, neg_upap, PPP_PAP); } REJCILQR(CI_QUALITY, neg_lqr, go->lqr_period); REJCILONG(CI_MAGICNUMBER, neg_magicnumber, go->magicnumber); @@ -933,7 +987,7 @@ lcp_reqci(f, inp, lenp, reject_if_disagree) u_char *cip, *next; /* Pointer to current and next CIs */ u_char cilen, citype, cichar;/* Parsed len, type, char value */ u_short cishort; /* Parsed short value */ - u_long cilong; /* Parse long value */ + u_int32_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 */ @@ -1041,7 +1095,7 @@ lcp_reqci(f, inp, lenp, reject_if_disagree) * the ordering of the CIs in the peer's Configure-Request. */ - if (cishort == UPAP) { + if (cishort == PPP_PAP) { if (!ao->neg_upap || /* we don't want to do PAP */ ho->neg_chap || /* or we've already accepted CHAP */ cilen != CILEN_SHORT) { @@ -1053,7 +1107,7 @@ lcp_reqci(f, inp, lenp, reject_if_disagree) ho->neg_upap = 1; break; } - if (cishort == CHAP) { + if (cishort == PPP_CHAP) { if (!ao->neg_chap || /* we don't want to do CHAP */ ho->neg_upap || /* or we've already accepted UPAP */ cilen != CILEN_CHAP) { @@ -1094,7 +1148,7 @@ lcp_reqci(f, inp, lenp, reject_if_disagree) GETSHORT(cishort, p); GETLONG(cilong, p); LCPDEBUG((LOG_INFO, "(%x %lx)", cishort, cilong)); - if (cishort != LQR) { + if (cishort != PPP_LQR) { orc = CONFREJ; break; } @@ -1213,17 +1267,27 @@ lcp_up(f) lcp_options *go = &lcp_gotoptions[f->unit]; lcp_options *ao = &lcp_allowoptions[f->unit]; + 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, (ho->neg_mru? MIN(ao->mru, ho->mru): MTU), + ppp_send_config(f->unit, MIN(ao->mru, (ho->neg_mru? ho->mru: PPP_MRU)), (ho->neg_asyncmap? ho->asyncmap: 0xffffffff), ho->neg_pcompression, ho->neg_accompression); - ppp_recv_config(f->unit, (go->neg_mru? MAX(wo->mru, go->mru): MTU), - (go->neg_asyncmap? go->asyncmap: 0xffffffff), + /* + * 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): PPP_MRU), + (go->neg_asyncmap? go->asyncmap: 0x00000000), go->neg_pcompression, go->neg_accompression); if (ho->neg_mru) @@ -1232,6 +1296,8 @@ lcp_up(f) ChapLowerUp(f->unit); /* Enable CHAP */ upap_lowerup(f->unit); /* Enable UPAP */ ipcp_lowerup(f->unit); /* Enable IPCP */ + ccp_lowerup(f->unit); /* Enable CCP */ + lcp_echo_lowerup(f->unit); /* Enable echo messages */ link_established(f->unit); } @@ -1246,15 +1312,18 @@ static void lcp_down(f) fsm *f; { + lcp_echo_lowerdown(f->unit); + ccp_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, 0, 0, 0); - peer_mru[f->unit] = MTU; - syslog(LOG_NOTICE, "Connection terminated."); + ppp_send_config(f->unit, PPP_MRU, 0xffffffff, 0, 0); + ppp_recv_config(f->unit, PPP_MRU, 0x00000000, 0, 0); + peer_mru[f->unit] = PPP_MRU; + + link_down(f->unit); } @@ -1279,3 +1348,313 @@ lcp_finished(f) 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) __P((void *, char *, ...)); + void *arg; +{ + int code, id, len, olen; + u_char *pstart, *optend; + u_short cishort; + u_int32_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%x", cilong); + } + break; + case CI_AUTHTYPE: + if (olen >= CILEN_SHORT) { + p += 2; + printer(arg, "auth "); + GETSHORT(cishort, p); + switch (cishort) { + case PPP_PAP: + printer(arg, "upap"); + 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_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_close(f->unit); /* Reset connection */ + } +} + +/* + * Timer expired for the LCP echo requests from this process. + */ + +static void +LcpEchoCheck (f) + fsm *f; +{ + u_int32_t delta; +#ifdef __linux__ + struct ppp_ddinfo ddinfo; + u_int32_t 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 = lcp_echo_interval; +#endif + +/* + * Start the timer for the next interval. + */ + assert (lcp_echo_timer_running==0); + TIMEOUT (LcpEchoTimeout, (caddr_t) f, delta); + lcp_echo_timer_running = 1; +} + +/* + * LcpEchoTimeout - Timer expired on the LCP echo + */ + +static void +LcpEchoTimeout (arg) + caddr_t 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 (f, id, inp, len) + fsm *f; + int id; u_char *inp; int len; +{ + u_int32_t magic; + + /* Check the magic number - don't count replies from ourselves. */ + if (len < 4) { + syslog(LOG_DEBUG, "lcp: received short Echo-Reply, length %d", len); + return; + } + GETLONG(magic, inp); + if (lcp_gotoptions[f->unit].neg_magicnumber + && magic == lcp_gotoptions[f->unit].magicnumber) { + syslog(LOG_WARNING, "appear to have received our own echo-reply!"); + return; + } + + /* Reset the number of outstanding echo frames */ + lcp_echos_pending = 0; +} + +/* + * LcpSendEchoRequest - Send an echo request frame to the peer + */ + +static void +LcpSendEchoRequest (f) + fsm *f; +{ + u_int32_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].neg_magicnumber + ? lcp_gotoptions[f->unit].magicnumber + : 0L; + pktp = pkt; + PUTLONG(lcp_magic, pktp); + + fsm_sdata(f, ECHOREQ, + 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 = &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 (unit) + int unit; +{ + fsm *f = &lcp_fsm[unit]; + + if (lcp_echo_timer_running != 0) { + UNTIMEOUT (LcpEchoTimeout, (caddr_t) f); + lcp_echo_timer_running = 0; + } +}