X-Git-Url: https://git.ozlabs.org/?p=ppp.git;a=blobdiff_plain;f=pppd%2Ffsm.c;h=17cb76f8fd11e2cd53943ff598c57e0273419dd3;hp=6c74036aa0bfc2d27070c745abfd658ff9f16358;hb=a12ffcd5b0a1cf9a4920064295c9b02b127465b3;hpb=05c09ae62d0b4ff67fb26c37a01e6a07bb593c0c diff --git a/pppd/fsm.c b/pppd/fsm.c index 6c74036..17cb76f 100644 --- a/pppd/fsm.c +++ b/pppd/fsm.c @@ -1,23 +1,48 @@ /* * fsm.c - {Link, IP} Control Protocol Finite State Machine. * - * Copyright (c) 1989 Carnegie Mellon University. - * All rights reserved. + * Copyright (c) 1984-2000 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. + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. The name "Carnegie Mellon University" must not be used to + * endorse or promote products derived from this software without + * prior written permission. For permission or any legal + * details, please contact + * Office of Technology Transfer + * Carnegie Mellon University + * 5000 Forbes Avenue + * Pittsburgh, PA 15213-3890 + * (412) 268-4387, fax: (412) 268-7395 + * tech-transfer@andrew.cmu.edu + * + * 4. Redistributions of any form whatsoever must retain the following + * acknowledgment: + * "This product includes software developed by Computing Services + * at Carnegie Mellon University (http://www.cmu.edu/computing/)." + * + * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO + * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY + * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE + * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN + * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING + * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ -#define RCSID "$Id: fsm.c,v 1.18 2002/06/24 12:57:15 dfs Exp $" +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif /* * TODO: @@ -32,16 +57,15 @@ #include "pppd.h" #include "fsm.h" -static const char rcsid[] = RCSID; -static void fsm_timeout __P((void *)); -static void fsm_rconfreq __P((fsm *, int, u_char *, int)); -static void fsm_rconfack __P((fsm *, int, u_char *, int)); -static void fsm_rconfnakrej __P((fsm *, int, int, u_char *, int)); -static void fsm_rtermreq __P((fsm *, int, u_char *, int)); -static void fsm_rtermack __P((fsm *)); -static void fsm_rcoderej __P((fsm *, u_char *, int)); -static void fsm_sconfreq __P((fsm *, int)); +static void fsm_timeout (void *); +static void fsm_rconfreq (fsm *, int, u_char *, int); +static void fsm_rconfack (fsm *, int, u_char *, int); +static void fsm_rconfnakrej (fsm *, int, int, u_char *, int); +static void fsm_rtermreq (fsm *, int, u_char *, int); +static void fsm_rtermack (fsm *); +static void fsm_rcoderej (fsm *, u_char *, int); +static void fsm_sconfreq (fsm *, int); #define PROTO_NAME(f) ((f)->callbacks->proto_name) @@ -54,8 +78,7 @@ int peer_mru[NUM_PPP]; * Initialize fsm state. */ void -fsm_init(f) - fsm *f; +fsm_init(fsm *f) { f->state = INITIAL; f->flags = 0; @@ -72,8 +95,7 @@ fsm_init(f) * fsm_lowerup - The lower layer is up. */ void -fsm_lowerup(f) - fsm *f; +fsm_lowerup(fsm *f) { switch( f->state ){ case INITIAL: @@ -102,8 +124,7 @@ fsm_lowerup(f) * Cancel all timeouts and inform upper layers. */ void -fsm_lowerdown(f) - fsm *f; +fsm_lowerdown(fsm *f) { switch( f->state ){ case CLOSED: @@ -145,8 +166,7 @@ fsm_lowerdown(f) * fsm_open - Link is allowed to come up. */ void -fsm_open(f) - fsm *f; +fsm_open(fsm *f) { switch( f->state ){ case INITIAL: @@ -178,6 +198,42 @@ fsm_open(f) } } +/* + * terminate_layer - Start process of shutting down the FSM + * + * Cancel any timeout running, notify upper layers we're done, and + * send a terminate-request message as configured. + */ +static void +terminate_layer(fsm *f, int nextstate) +{ + if( f->state != OPENED ) + UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */ + else if( f->callbacks->down ) + (*f->callbacks->down)(f); /* Inform upper layers we're down */ + + /* Init restart counter and send Terminate-Request */ + f->retransmits = f->maxtermtransmits; + fsm_sdata(f, TERMREQ, f->reqid = ++f->id, + (u_char *) f->term_reason, f->term_reason_len); + + if (f->retransmits == 0) { + /* + * User asked for no terminate requests at all; just close it. + * We've already fired off one Terminate-Request just to be nice + * to the peer, but we're not going to wait for a reply. + */ + f->state = nextstate == CLOSING ? CLOSED : STOPPED; + if( f->callbacks->finished ) + (*f->callbacks->finished)(f); + return; + } + + TIMEOUT(fsm_timeout, f, f->timeouttime); + --f->retransmits; + + f->state = nextstate; +} /* * fsm_close - Start closing connection. @@ -186,9 +242,7 @@ fsm_open(f) * the CLOSED state. */ void -fsm_close(f, reason) - fsm *f; - char *reason; +fsm_close(fsm *f, char *reason) { f->term_reason = reason; f->term_reason_len = (reason == NULL? 0: strlen(reason)); @@ -207,19 +261,7 @@ fsm_close(f, reason) case ACKRCVD: case ACKSENT: case OPENED: - if( f->state != OPENED ) - UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */ - else if( f->callbacks->down ) - (*f->callbacks->down)(f); /* Inform upper layers we're down */ - - /* Init restart counter, send Terminate-Request */ - f->retransmits = f->maxtermtransmits; - fsm_sdata(f, TERMREQ, f->reqid = ++f->id, - (u_char *) f->term_reason, f->term_reason_len); - TIMEOUT(fsm_timeout, f, f->timeouttime); - --f->retransmits; - - f->state = CLOSING; + terminate_layer(f, CLOSING); break; } } @@ -229,8 +271,7 @@ fsm_close(f, reason) * fsm_timeout - Timeout expired. */ static void -fsm_timeout(arg) - void *arg; +fsm_timeout(void *arg) { fsm *f = (fsm *) arg; @@ -282,10 +323,7 @@ fsm_timeout(arg) * fsm_input - Input packet. */ void -fsm_input(f, inpacket, l) - fsm *f; - u_char *inpacket; - int l; +fsm_input(fsm *f, u_char *inpacket, int l) { u_char *inp; u_char code, id; @@ -361,11 +399,7 @@ fsm_input(f, inpacket, l) * fsm_rconfreq - Receive Configure-Request. */ static void -fsm_rconfreq(f, id, inp, len) - fsm *f; - u_char id; - u_char *inp; - int len; +fsm_rconfreq(fsm *f, int id, u_char *inp, int len) { int code, reject_if_disagree; @@ -383,6 +417,7 @@ fsm_rconfreq(f, id, inp, len) if( f->callbacks->down ) (*f->callbacks->down)(f); /* Inform upper layers */ fsm_sconfreq(f, 0); /* Send initial Configure-Request */ + f->state = REQSENT; break; case STOPPED: @@ -418,7 +453,7 @@ fsm_rconfreq(f, id, inp, len) f->nakloops = 0; } else { - /* we sent CONFACK or CONFREJ */ + /* we sent CONFNAK or CONFREJ */ if (f->state != ACKRCVD) f->state = REQSENT; if( code == CONFNAK ) @@ -431,11 +466,7 @@ fsm_rconfreq(f, id, inp, len) * fsm_rconfack - Receive Configure-Ack. */ static void -fsm_rconfack(f, id, inp, len) - fsm *f; - int id; - u_char *inp; - int len; +fsm_rconfack(fsm *f, int id, u_char *inp, int len) { if (id != f->reqid || f->seen_ack) /* Expected id? */ return; /* Nope, toss... */ @@ -446,6 +477,7 @@ fsm_rconfack(f, id, inp, len) return; } f->seen_ack = 1; + f->rnakloops = 0; switch (f->state) { case CLOSED: @@ -488,23 +520,31 @@ fsm_rconfack(f, id, inp, len) * fsm_rconfnakrej - Receive Configure-Nak or Configure-Reject. */ static void -fsm_rconfnakrej(f, code, id, inp, len) - fsm *f; - int code, id; - u_char *inp; - int len; +fsm_rconfnakrej(fsm *f, int code, int id, u_char *inp, int len) { - int (*proc) __P((fsm *, u_char *, int)); int ret; + int treat_as_reject; if (id != f->reqid || f->seen_ack) /* Expected id? */ return; /* Nope, toss... */ - proc = (code == CONFNAK)? f->callbacks->nakci: f->callbacks->rejci; - if (!proc || !(ret = proc(f, inp, len))) { - /* Nak/reject is bad - ignore it */ - error("Received bad configure-nak/rej: %P", inp, len); - return; + + if (code == CONFNAK) { + ++f->rnakloops; + treat_as_reject = (f->rnakloops >= f->maxnakloops); + if (f->callbacks->nakci == NULL + || !(ret = f->callbacks->nakci(f, inp, len, treat_as_reject))) { + error("Received bad configure-nak: %P", inp, len); + return; + } + } else { + f->rnakloops = 0; + if (f->callbacks->rejci == NULL + || !(ret = f->callbacks->rejci(f, inp, len))) { + error("Received bad configure-rej: %P", inp, len); + return; + } } + f->seen_ack = 1; switch (f->state) { @@ -545,11 +585,7 @@ fsm_rconfnakrej(f, code, id, inp, len) * fsm_rtermreq - Receive Terminate-Req. */ static void -fsm_rtermreq(f, id, p, len) - fsm *f; - int id; - u_char *p; - int len; +fsm_rtermreq(fsm *f, int id, u_char *p, int len) { switch (f->state) { case ACKRCVD: @@ -578,8 +614,7 @@ fsm_rtermreq(f, id, p, len) * fsm_rtermack - Receive Terminate-Ack. */ static void -fsm_rtermack(f) - fsm *f; +fsm_rtermack(fsm *f) { switch (f->state) { case CLOSING: @@ -603,6 +638,7 @@ fsm_rtermack(f) if (f->callbacks->down) (*f->callbacks->down)(f); /* Inform upper layers */ fsm_sconfreq(f, 0); + f->state = REQSENT; break; } } @@ -612,10 +648,7 @@ fsm_rtermack(f) * fsm_rcoderej - Receive an Code-Reject. */ static void -fsm_rcoderej(f, inp, len) - fsm *f; - u_char *inp; - int len; +fsm_rcoderej(fsm *f, u_char *inp, int len) { u_char code, id; @@ -638,8 +671,7 @@ fsm_rcoderej(f, inp, len) * Treat this as a catastrophic error (RXJ-). */ void -fsm_protreject(f) - fsm *f; +fsm_protreject(fsm *f) { switch( f->state ){ case CLOSING: @@ -664,17 +696,7 @@ fsm_protreject(f) break; case OPENED: - if( f->callbacks->down ) - (*f->callbacks->down)(f); - - /* Init restart counter, send Terminate-Request */ - f->retransmits = f->maxtermtransmits; - fsm_sdata(f, TERMREQ, f->reqid = ++f->id, - (u_char *) f->term_reason, f->term_reason_len); - TIMEOUT(fsm_timeout, f, f->timeouttime); - --f->retransmits; - - f->state = STOPPING; + terminate_layer(f, STOPPING); break; default: @@ -688,9 +710,7 @@ fsm_protreject(f) * fsm_sconfreq - Send a Configure-Request. */ static void -fsm_sconfreq(f, retransmit) - fsm *f; - int retransmit; +fsm_sconfreq(fsm *f, int retransmit) { u_char *outp; int cilen; @@ -700,6 +720,7 @@ fsm_sconfreq(f, retransmit) if( f->callbacks->resetci ) (*f->callbacks->resetci)(f); f->nakloops = 0; + f->rnakloops = 0; } if( !retransmit ){ @@ -738,11 +759,7 @@ fsm_sconfreq(f, retransmit) * Used for all packets sent to our peer by this module. */ void -fsm_sdata(f, code, id, data, datalen) - fsm *f; - u_char code, id; - u_char *data; - int datalen; +fsm_sdata(fsm *f, int code, int id, u_char *data, int datalen) { u_char *outp; int outlen;