X-Git-Url: http://git.ozlabs.org/?p=ppp.git;a=blobdiff_plain;f=pppd%2Flcp.c;h=eb5f1c51741075947fc3b5b5eaaf06d35dd6ce04;hp=e1eb6f2a4bfbe1896fbc3edaaf999ec551e46041;hb=af60ef5263008c980a3077203e09a54a0fa8003c;hpb=afe0aeff34d3e453578f1c419946453600633654 diff --git a/pppd/lcp.c b/pppd/lcp.c index e1eb6f2..eb5f1c5 100644 --- a/pppd/lcp.c +++ b/pppd/lcp.c @@ -18,28 +18,23 @@ */ #ifndef lint -static char rcsid[] = "$Id: lcp.c,v 1.4 1994/05/09 04:32:41 paulus Exp $"; +static char rcsid[] = "$Id: lcp.c,v 1.12 1994/09/01 00:24:14 paulus Exp $"; #endif /* * TODO: - * Option tracing. - * Test restart. */ #include +#include #include +#include #include #include #include #include - -#include -#include #include -#include - #include "pppd.h" #include "ppp.h" #include "fsm.h" @@ -49,13 +44,21 @@ static char rcsid[] = "$Id: lcp.c,v 1.4 1994/05/09 04:32:41 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 */ -u_long xmit_accm[NPPP][8]; /* extended transmit ACCM */ +uint32 xmit_accm[NPPP][8]; /* extended transmit ACCM */ + +static uint32 lcp_echos_pending = 0; /* Number of outstanding echo msgs */ +static uint32 lcp_echo_number = 0; /* ID number of next echo frame */ +static uint32 lcp_echo_timer_running = 0; /* TRUE if a timer is running */ /* * Callbacks for fsm code. (CI = Configuration Information) @@ -74,6 +77,17 @@ 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 */ @@ -210,7 +224,7 @@ lcp_lowerup(unit) sifdown(unit); ppp_set_xaccm(unit, xmit_accm[unit]); ppp_send_config(unit, MTU, 0xffffffff, 0, 0); - ppp_recv_config(unit, MTU, 0, 0, 0); + ppp_recv_config(unit, MTU, 0x00000000, 0, 0); peer_mru[unit] = MTU; lcp_allowoptions[unit].asyncmap = xmit_accm[unit][0]; @@ -252,19 +266,26 @@ 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; @@ -474,7 +495,7 @@ lcp_ackci(f, p, len) lcp_options *go = &lcp_gotoptions[f->unit]; u_char cilen, citype, cichar; u_short cishort; - u_long cilong; + uint32 cilong; /* * CIs must be in exactly the same order that we sent. @@ -590,7 +611,7 @@ lcp_nakci(f, p, len) lcp_options *wo = &lcp_wantoptions[f->unit]; u_char cilen, citype, cichar, *next; u_short cishort; - u_long cilong; + uint32 cilong; lcp_options no; /* options we've seen Naks for */ lcp_options try; /* options to request next time */ int looped_back = 0; @@ -699,12 +720,12 @@ 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 != LQR) + try.neg_lqr = 0; + else + try.lqr_period = cilong; + ); /* * Check for a looped-back line. */ @@ -790,7 +811,7 @@ 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; @@ -819,7 +840,7 @@ lcp_rejci(f, p, len) lcp_options *go = &lcp_gotoptions[f->unit]; u_char cichar; u_short cishort; - u_long cilong; + uint32 cilong; u_char *start = p; int plen = len; lcp_options try; /* options to request next time */ @@ -894,7 +915,7 @@ lcp_rejci(f, p, len) GETSHORT(cishort, p); \ GETLONG(cilong, p); \ /* Check rejected value. */ \ - if (cishort != LQR || cichar != val) \ + if (cishort != LQR || cilong != val) \ goto bad; \ try.neg = 0; \ LCPDEBUG((LOG_INFO,"lcp_rejci rejected LQR opt %d", opt)); \ @@ -951,7 +972,7 @@ 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 */ + uint32 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 */ @@ -1231,6 +1252,11 @@ 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, @@ -1240,8 +1266,13 @@ lcp_up(f) ppp_send_config(f->unit, MIN(ao->mru, (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: 0xffffffff), + (go->neg_asyncmap? go->asyncmap: 0x00000000), go->neg_pcompression, go->neg_accompression); if (ho->neg_mru) @@ -1250,6 +1281,8 @@ 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); } @@ -1264,13 +1297,15 @@ 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); + ppp_recv_config(f->unit, MTU, 0x00000000, 0, 0); peer_mru[f->unit] = MTU; link_down(f->unit); @@ -1318,7 +1353,7 @@ lcp_printpkt(p, plen, printer, arg) int code, id, len, olen; u_char *pstart, *optend; u_short cishort; - u_long cilong; + uint32 cilong; if (plen < HEADERLEN) return 0; @@ -1434,3 +1469,177 @@ lcp_printpkt(p, plen, printer, arg) 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; +{ + uint32 delta; +#ifdef __linux__ + struct ppp_ddinfo ddinfo; + uint32 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; +{ + uint32 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; +{ + uint32 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; + } +}