[164] | 1 | /*****************************************************************************
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| 2 | * fsm.c - Network Control Protocol Finite State Machine program file.
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| 3 | *
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| 4 | * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
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| 5 | * portions Copyright (c) 1997 by Global Election Systems Inc.
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| 6 | *
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| 7 | * The authors hereby grant permission to use, copy, modify, distribute,
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| 8 | * and license this software and its documentation for any purpose, provided
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| 9 | * that existing copyright notices are retained in all copies and that this
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| 10 | * notice and the following disclaimer are included verbatim in any
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| 11 | * distributions. No written agreement, license, or royalty fee is required
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| 12 | * for any of the authorized uses.
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| 13 | *
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| 14 | * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
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| 15 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 16 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 17 | * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 18 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 19 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 20 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 21 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 23 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 24 | *
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| 25 | ******************************************************************************
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| 26 | * REVISION HISTORY
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| 27 | *
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| 28 | * 03-01-01 Marc Boucher <marc@mbsi.ca>
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| 29 | * Ported to lwIP.
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| 30 | * 97-12-01 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
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| 31 | * Original based on BSD fsm.c.
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| 32 | *****************************************************************************/
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| 33 | /*
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| 34 | * fsm.c - {Link, IP} Control Protocol Finite State Machine.
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| 35 | *
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| 36 | * Copyright (c) 1989 Carnegie Mellon University.
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| 37 | * All rights reserved.
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| 38 | *
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| 39 | * Redistribution and use in source and binary forms are permitted
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| 40 | * provided that the above copyright notice and this paragraph are
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| 41 | * duplicated in all such forms and that any documentation,
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| 42 | * advertising materials, and other materials related to such
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| 43 | * distribution and use acknowledge that the software was developed
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| 44 | * by Carnegie Mellon University. The name of the
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| 45 | * University may not be used to endorse or promote products derived
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| 46 | * from this software without specific prior written permission.
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| 47 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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| 48 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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| 49 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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| 50 | */
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| 51 |
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| 52 | /*
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| 53 | * TODO:
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| 54 | * Randomize fsm id on link/init.
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| 55 | * Deal with variable outgoing MTU.
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| 56 | */
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| 57 |
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| 58 | #include "lwip/opt.h"
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| 59 |
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| 60 | #if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
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| 61 |
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| 62 | #include "ppp_impl.h"
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| 63 | #include "pppdebug.h"
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| 64 |
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| 65 | #include "fsm.h"
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| 66 |
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| 67 | #include <string.h>
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| 68 |
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| 69 | #if PPP_DEBUG
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| 70 | static const char *ppperr_strerr[] = {
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| 71 | "LS_INITIAL", /* LS_INITIAL 0 */
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| 72 | "LS_STARTING", /* LS_STARTING 1 */
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| 73 | "LS_CLOSED", /* LS_CLOSED 2 */
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| 74 | "LS_STOPPED", /* LS_STOPPED 3 */
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| 75 | "LS_CLOSING", /* LS_CLOSING 4 */
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| 76 | "LS_STOPPING", /* LS_STOPPING 5 */
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| 77 | "LS_REQSENT", /* LS_REQSENT 6 */
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| 78 | "LS_ACKRCVD", /* LS_ACKRCVD 7 */
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| 79 | "LS_ACKSENT", /* LS_ACKSENT 8 */
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| 80 | "LS_OPENED" /* LS_OPENED 9 */
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| 81 | };
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| 82 | #endif /* PPP_DEBUG */
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| 83 |
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| 84 | static void fsm_timeout (void *);
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| 85 | static void fsm_rconfreq (fsm *, u_char, u_char *, int);
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| 86 | static void fsm_rconfack (fsm *, int, u_char *, int);
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| 87 | static void fsm_rconfnakrej (fsm *, int, int, u_char *, int);
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| 88 | static void fsm_rtermreq (fsm *, int, u_char *, int);
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| 89 | static void fsm_rtermack (fsm *);
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| 90 | static void fsm_rcoderej (fsm *, u_char *, int);
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| 91 | static void fsm_sconfreq (fsm *, int);
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| 92 |
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| 93 | #define PROTO_NAME(f) ((f)->callbacks->proto_name)
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| 94 |
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| 95 | int peer_mru[NUM_PPP];
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| 96 |
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| 97 |
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| 98 | /*
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| 99 | * fsm_init - Initialize fsm.
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| 100 | *
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| 101 | * Initialize fsm state.
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| 102 | */
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| 103 | void
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| 104 | fsm_init(fsm *f)
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| 105 | {
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| 106 | f->state = LS_INITIAL;
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| 107 | f->flags = 0;
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| 108 | f->id = 0; /* XXX Start with random id? */
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| 109 | f->timeouttime = FSM_DEFTIMEOUT;
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| 110 | f->maxconfreqtransmits = FSM_DEFMAXCONFREQS;
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| 111 | f->maxtermtransmits = FSM_DEFMAXTERMREQS;
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| 112 | f->maxnakloops = FSM_DEFMAXNAKLOOPS;
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| 113 | f->term_reason_len = 0;
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| 114 | }
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| 115 |
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| 116 |
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| 117 | /*
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| 118 | * fsm_lowerup - The lower layer is up.
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| 119 | */
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| 120 | void
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| 121 | fsm_lowerup(fsm *f)
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| 122 | {
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| 123 | int oldState = f->state;
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| 124 |
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| 125 | LWIP_UNUSED_ARG(oldState);
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| 126 |
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| 127 | switch( f->state ) {
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| 128 | case LS_INITIAL:
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| 129 | f->state = LS_CLOSED;
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| 130 | break;
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| 131 |
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| 132 | case LS_STARTING:
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| 133 | if( f->flags & OPT_SILENT ) {
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| 134 | f->state = LS_STOPPED;
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| 135 | } else {
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| 136 | /* Send an initial configure-request */
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| 137 | fsm_sconfreq(f, 0);
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| 138 | f->state = LS_REQSENT;
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| 139 | }
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| 140 | break;
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| 141 |
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| 142 | default:
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| 143 | FSMDEBUG(LOG_INFO, ("%s: Up event in state %d (%s)!\n",
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| 144 | PROTO_NAME(f), f->state, ppperr_strerr[f->state]));
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| 145 | }
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| 146 |
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| 147 | FSMDEBUG(LOG_INFO, ("%s: lowerup state %d (%s) -> %d (%s)\n",
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| 148 | PROTO_NAME(f), oldState, ppperr_strerr[oldState], f->state, ppperr_strerr[f->state]));
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| 149 | }
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| 150 |
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| 151 |
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| 152 | /*
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| 153 | * fsm_lowerdown - The lower layer is down.
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| 154 | *
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| 155 | * Cancel all timeouts and inform upper layers.
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| 156 | */
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| 157 | void
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| 158 | fsm_lowerdown(fsm *f)
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| 159 | {
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| 160 | int oldState = f->state;
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| 161 |
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| 162 | LWIP_UNUSED_ARG(oldState);
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| 163 |
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| 164 | switch( f->state ) {
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| 165 | case LS_CLOSED:
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| 166 | f->state = LS_INITIAL;
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| 167 | break;
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| 168 |
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| 169 | case LS_STOPPED:
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| 170 | f->state = LS_STARTING;
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| 171 | if( f->callbacks->starting ) {
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| 172 | (*f->callbacks->starting)(f);
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| 173 | }
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| 174 | break;
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| 175 |
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| 176 | case LS_CLOSING:
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| 177 | f->state = LS_INITIAL;
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| 178 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
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| 179 | break;
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| 180 |
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| 181 | case LS_STOPPING:
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| 182 | case LS_REQSENT:
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| 183 | case LS_ACKRCVD:
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| 184 | case LS_ACKSENT:
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| 185 | f->state = LS_STARTING;
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| 186 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
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| 187 | break;
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| 188 |
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| 189 | case LS_OPENED:
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| 190 | if( f->callbacks->down ) {
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| 191 | (*f->callbacks->down)(f);
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| 192 | }
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| 193 | f->state = LS_STARTING;
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| 194 | break;
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| 195 |
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| 196 | default:
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| 197 | FSMDEBUG(LOG_INFO, ("%s: Down event in state %d (%s)!\n",
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| 198 | PROTO_NAME(f), f->state, ppperr_strerr[f->state]));
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| 199 | }
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| 200 |
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| 201 | FSMDEBUG(LOG_INFO, ("%s: lowerdown state %d (%s) -> %d (%s)\n",
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| 202 | PROTO_NAME(f), oldState, ppperr_strerr[oldState], f->state, ppperr_strerr[f->state]));
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| 203 | }
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| 204 |
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| 205 |
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| 206 | /*
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| 207 | * fsm_open - Link is allowed to come up.
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| 208 | */
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| 209 | void
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| 210 | fsm_open(fsm *f)
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| 211 | {
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| 212 | int oldState = f->state;
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| 213 |
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| 214 | LWIP_UNUSED_ARG(oldState);
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| 215 |
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| 216 | switch( f->state ) {
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| 217 | case LS_INITIAL:
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| 218 | f->state = LS_STARTING;
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| 219 | if( f->callbacks->starting ) {
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| 220 | (*f->callbacks->starting)(f);
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| 221 | }
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| 222 | break;
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| 223 |
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| 224 | case LS_CLOSED:
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| 225 | if( f->flags & OPT_SILENT ) {
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| 226 | f->state = LS_STOPPED;
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| 227 | } else {
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| 228 | /* Send an initial configure-request */
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| 229 | fsm_sconfreq(f, 0);
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| 230 | f->state = LS_REQSENT;
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| 231 | }
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| 232 | break;
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| 233 |
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| 234 | case LS_CLOSING:
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| 235 | f->state = LS_STOPPING;
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| 236 | /* fall through */
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| 237 | case LS_STOPPED:
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| 238 | case LS_OPENED:
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| 239 | if( f->flags & OPT_RESTART ) {
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| 240 | fsm_lowerdown(f);
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| 241 | fsm_lowerup(f);
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| 242 | }
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| 243 | break;
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| 244 | }
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| 245 |
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| 246 | FSMDEBUG(LOG_INFO, ("%s: open state %d (%s) -> %d (%s)\n",
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| 247 | PROTO_NAME(f), oldState, ppperr_strerr[oldState], f->state, ppperr_strerr[f->state]));
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| 248 | }
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| 249 |
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| 250 | #if 0 /* backport pppd 2.4.4b1; */
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| 251 | /*
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| 252 | * terminate_layer - Start process of shutting down the FSM
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| 253 | *
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| 254 | * Cancel any timeout running, notify upper layers we're done, and
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| 255 | * send a terminate-request message as configured.
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| 256 | */
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| 257 | static void
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| 258 | terminate_layer(fsm *f, int nextstate)
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| 259 | {
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| 260 | /* @todo */
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| 261 | }
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| 262 | #endif
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| 263 |
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| 264 | /*
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| 265 | * fsm_close - Start closing connection.
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| 266 | *
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| 267 | * Cancel timeouts and either initiate close or possibly go directly to
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| 268 | * the LS_CLOSED state.
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| 269 | */
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| 270 | void
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| 271 | fsm_close(fsm *f, char *reason)
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| 272 | {
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| 273 | int oldState = f->state;
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| 274 |
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| 275 | LWIP_UNUSED_ARG(oldState);
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| 276 |
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| 277 | f->term_reason = reason;
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| 278 | f->term_reason_len = (reason == NULL ? 0 : (int)strlen(reason));
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| 279 | switch( f->state ) {
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| 280 | case LS_STARTING:
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| 281 | f->state = LS_INITIAL;
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| 282 | break;
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| 283 | case LS_STOPPED:
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| 284 | f->state = LS_CLOSED;
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| 285 | break;
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| 286 | case LS_STOPPING:
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| 287 | f->state = LS_CLOSING;
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| 288 | break;
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| 289 |
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| 290 | case LS_REQSENT:
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| 291 | case LS_ACKRCVD:
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| 292 | case LS_ACKSENT:
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| 293 | case LS_OPENED:
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| 294 | if( f->state != LS_OPENED ) {
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| 295 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
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| 296 | } else if( f->callbacks->down ) {
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| 297 | (*f->callbacks->down)(f); /* Inform upper layers we're down */
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| 298 | }
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| 299 | /* Init restart counter, send Terminate-Request */
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| 300 | f->retransmits = f->maxtermtransmits;
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| 301 | fsm_sdata(f, TERMREQ, f->reqid = ++f->id,
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| 302 | (u_char *) f->term_reason, f->term_reason_len);
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| 303 | TIMEOUT(fsm_timeout, f, f->timeouttime);
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| 304 | --f->retransmits;
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| 305 |
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| 306 | f->state = LS_CLOSING;
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| 307 | break;
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| 308 | }
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| 309 |
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| 310 | FSMDEBUG(LOG_INFO, ("%s: close reason=%s state %d (%s) -> %d (%s)\n",
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| 311 | PROTO_NAME(f), reason, oldState, ppperr_strerr[oldState], f->state, ppperr_strerr[f->state]));
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| 312 | }
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| 313 |
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| 314 |
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| 315 | /*
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| 316 | * fsm_timeout - Timeout expired.
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| 317 | */
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| 318 | static void
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| 319 | fsm_timeout(void *arg)
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| 320 | {
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| 321 | fsm *f = (fsm *) arg;
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| 322 |
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| 323 | switch (f->state) {
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| 324 | case LS_CLOSING:
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| 325 | case LS_STOPPING:
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| 326 | if( f->retransmits <= 0 ) {
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| 327 | FSMDEBUG(LOG_WARNING, ("%s: timeout sending Terminate-Request state=%d (%s)\n",
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| 328 | PROTO_NAME(f), f->state, ppperr_strerr[f->state]));
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| 329 | /*
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| 330 | * We've waited for an ack long enough. Peer probably heard us.
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| 331 | */
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| 332 | f->state = (f->state == LS_CLOSING)? LS_CLOSED: LS_STOPPED;
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| 333 | if( f->callbacks->finished ) {
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| 334 | (*f->callbacks->finished)(f);
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| 335 | }
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| 336 | } else {
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| 337 | FSMDEBUG(LOG_WARNING, ("%s: timeout resending Terminate-Requests state=%d (%s)\n",
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| 338 | PROTO_NAME(f), f->state, ppperr_strerr[f->state]));
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| 339 | /* Send Terminate-Request */
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| 340 | fsm_sdata(f, TERMREQ, f->reqid = ++f->id,
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| 341 | (u_char *) f->term_reason, f->term_reason_len);
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| 342 | TIMEOUT(fsm_timeout, f, f->timeouttime);
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| 343 | --f->retransmits;
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| 344 | }
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| 345 | break;
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| 346 |
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| 347 | case LS_REQSENT:
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| 348 | case LS_ACKRCVD:
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| 349 | case LS_ACKSENT:
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| 350 | if (f->retransmits <= 0) {
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| 351 | FSMDEBUG(LOG_WARNING, ("%s: timeout sending Config-Requests state=%d (%s)\n",
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| 352 | PROTO_NAME(f), f->state, ppperr_strerr[f->state]));
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| 353 | f->state = LS_STOPPED;
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| 354 | if( (f->flags & OPT_PASSIVE) == 0 && f->callbacks->finished ) {
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| 355 | (*f->callbacks->finished)(f);
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| 356 | }
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| 357 | } else {
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| 358 | FSMDEBUG(LOG_WARNING, ("%s: timeout resending Config-Request state=%d (%s)\n",
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| 359 | PROTO_NAME(f), f->state, ppperr_strerr[f->state]));
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| 360 | /* Retransmit the configure-request */
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| 361 | if (f->callbacks->retransmit) {
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| 362 | (*f->callbacks->retransmit)(f);
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| 363 | }
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| 364 | fsm_sconfreq(f, 1); /* Re-send Configure-Request */
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| 365 | if( f->state == LS_ACKRCVD ) {
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| 366 | f->state = LS_REQSENT;
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| 367 | }
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| 368 | }
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| 369 | break;
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| 370 |
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| 371 | default:
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| 372 | FSMDEBUG(LOG_INFO, ("%s: UNHANDLED timeout event in state %d (%s)!\n",
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| 373 | PROTO_NAME(f), f->state, ppperr_strerr[f->state]));
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| 374 | }
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| 375 | }
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| 376 |
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| 377 |
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| 378 | /*
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| 379 | * fsm_input - Input packet.
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| 380 | */
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| 381 | void
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| 382 | fsm_input(fsm *f, u_char *inpacket, int l)
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| 383 | {
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| 384 | u_char *inp = inpacket;
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| 385 | u_char code, id;
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| 386 | int len;
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| 387 |
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| 388 | /*
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| 389 | * Parse header (code, id and length).
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| 390 | * If packet too short, drop it.
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| 391 | */
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| 392 | if (l < HEADERLEN) {
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| 393 | FSMDEBUG(LOG_WARNING, ("fsm_input(%x): Rcvd short header.\n",
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| 394 | f->protocol));
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| 395 | return;
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| 396 | }
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| 397 | GETCHAR(code, inp);
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| 398 | GETCHAR(id, inp);
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| 399 | GETSHORT(len, inp);
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| 400 | if (len < HEADERLEN) {
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| 401 | FSMDEBUG(LOG_INFO, ("fsm_input(%x): Rcvd illegal length.\n",
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| 402 | f->protocol));
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| 403 | return;
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| 404 | }
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| 405 | if (len > l) {
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| 406 | FSMDEBUG(LOG_INFO, ("fsm_input(%x): Rcvd short packet.\n",
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| 407 | f->protocol));
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| 408 | return;
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| 409 | }
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| 410 | len -= HEADERLEN; /* subtract header length */
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| 411 |
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| 412 | if( f->state == LS_INITIAL || f->state == LS_STARTING ) {
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| 413 | FSMDEBUG(LOG_INFO, ("fsm_input(%x): Rcvd packet in state %d (%s).\n",
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| 414 | f->protocol, f->state, ppperr_strerr[f->state]));
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| 415 | return;
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| 416 | }
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| 417 | FSMDEBUG(LOG_INFO, ("fsm_input(%s):%d,%d,%d\n", PROTO_NAME(f), code, id, l));
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| 418 | /*
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| 419 | * Action depends on code.
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| 420 | */
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| 421 | switch (code) {
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| 422 | case CONFREQ:
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| 423 | fsm_rconfreq(f, id, inp, len);
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| 424 | break;
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| 425 |
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| 426 | case CONFACK:
|
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| 427 | fsm_rconfack(f, id, inp, len);
|
---|
| 428 | break;
|
---|
| 429 |
|
---|
| 430 | case CONFNAK:
|
---|
| 431 | case CONFREJ:
|
---|
| 432 | fsm_rconfnakrej(f, code, id, inp, len);
|
---|
| 433 | break;
|
---|
| 434 |
|
---|
| 435 | case TERMREQ:
|
---|
| 436 | fsm_rtermreq(f, id, inp, len);
|
---|
| 437 | break;
|
---|
| 438 |
|
---|
| 439 | case TERMACK:
|
---|
| 440 | fsm_rtermack(f);
|
---|
| 441 | break;
|
---|
| 442 |
|
---|
| 443 | case CODEREJ:
|
---|
| 444 | fsm_rcoderej(f, inp, len);
|
---|
| 445 | break;
|
---|
| 446 |
|
---|
| 447 | default:
|
---|
| 448 | FSMDEBUG(LOG_INFO, ("fsm_input(%s): default: \n", PROTO_NAME(f)));
|
---|
| 449 | if( !f->callbacks->extcode ||
|
---|
| 450 | !(*f->callbacks->extcode)(f, code, id, inp, len) ) {
|
---|
| 451 | fsm_sdata(f, CODEREJ, ++f->id, inpacket, len + HEADERLEN);
|
---|
| 452 | }
|
---|
| 453 | break;
|
---|
| 454 | }
|
---|
| 455 | }
|
---|
| 456 |
|
---|
| 457 |
|
---|
| 458 | /*
|
---|
| 459 | * fsm_rconfreq - Receive Configure-Request.
|
---|
| 460 | */
|
---|
| 461 | static void
|
---|
| 462 | fsm_rconfreq(fsm *f, u_char id, u_char *inp, int len)
|
---|
| 463 | {
|
---|
| 464 | int code, reject_if_disagree;
|
---|
| 465 |
|
---|
| 466 | FSMDEBUG(LOG_INFO, ("fsm_rconfreq(%s): Rcvd id %d state=%d (%s)\n",
|
---|
| 467 | PROTO_NAME(f), id, f->state, ppperr_strerr[f->state]));
|
---|
| 468 | switch( f->state ) {
|
---|
| 469 | case LS_CLOSED:
|
---|
| 470 | /* Go away, we're closed */
|
---|
| 471 | fsm_sdata(f, TERMACK, id, NULL, 0);
|
---|
| 472 | return;
|
---|
| 473 | case LS_CLOSING:
|
---|
| 474 | case LS_STOPPING:
|
---|
| 475 | return;
|
---|
| 476 |
|
---|
| 477 | case LS_OPENED:
|
---|
| 478 | /* Go down and restart negotiation */
|
---|
| 479 | if( f->callbacks->down ) {
|
---|
| 480 | (*f->callbacks->down)(f); /* Inform upper layers */
|
---|
| 481 | }
|
---|
| 482 | fsm_sconfreq(f, 0); /* Send initial Configure-Request */
|
---|
| 483 | break;
|
---|
| 484 |
|
---|
| 485 | case LS_STOPPED:
|
---|
| 486 | /* Negotiation started by our peer */
|
---|
| 487 | fsm_sconfreq(f, 0); /* Send initial Configure-Request */
|
---|
| 488 | f->state = LS_REQSENT;
|
---|
| 489 | break;
|
---|
| 490 | }
|
---|
| 491 |
|
---|
| 492 | /*
|
---|
| 493 | * Pass the requested configuration options
|
---|
| 494 | * to protocol-specific code for checking.
|
---|
| 495 | */
|
---|
| 496 | if (f->callbacks->reqci) { /* Check CI */
|
---|
| 497 | reject_if_disagree = (f->nakloops >= f->maxnakloops);
|
---|
| 498 | code = (*f->callbacks->reqci)(f, inp, &len, reject_if_disagree);
|
---|
| 499 | } else if (len) {
|
---|
| 500 | code = CONFREJ; /* Reject all CI */
|
---|
| 501 | } else {
|
---|
| 502 | code = CONFACK;
|
---|
| 503 | }
|
---|
| 504 |
|
---|
| 505 | /* send the Ack, Nak or Rej to the peer */
|
---|
| 506 | fsm_sdata(f, (u_char)code, id, inp, len);
|
---|
| 507 |
|
---|
| 508 | if (code == CONFACK) {
|
---|
| 509 | if (f->state == LS_ACKRCVD) {
|
---|
| 510 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
|
---|
| 511 | f->state = LS_OPENED;
|
---|
| 512 | if (f->callbacks->up) {
|
---|
| 513 | (*f->callbacks->up)(f); /* Inform upper layers */
|
---|
| 514 | }
|
---|
| 515 | } else {
|
---|
| 516 | f->state = LS_ACKSENT;
|
---|
| 517 | }
|
---|
| 518 | f->nakloops = 0;
|
---|
| 519 | } else {
|
---|
| 520 | /* we sent CONFACK or CONFREJ */
|
---|
| 521 | if (f->state != LS_ACKRCVD) {
|
---|
| 522 | f->state = LS_REQSENT;
|
---|
| 523 | }
|
---|
| 524 | if( code == CONFNAK ) {
|
---|
| 525 | ++f->nakloops;
|
---|
| 526 | }
|
---|
| 527 | }
|
---|
| 528 | }
|
---|
| 529 |
|
---|
| 530 |
|
---|
| 531 | /*
|
---|
| 532 | * fsm_rconfack - Receive Configure-Ack.
|
---|
| 533 | */
|
---|
| 534 | static void
|
---|
| 535 | fsm_rconfack(fsm *f, int id, u_char *inp, int len)
|
---|
| 536 | {
|
---|
| 537 | FSMDEBUG(LOG_INFO, ("fsm_rconfack(%s): Rcvd id %d state=%d (%s)\n",
|
---|
| 538 | PROTO_NAME(f), id, f->state, ppperr_strerr[f->state]));
|
---|
| 539 |
|
---|
| 540 | if (id != f->reqid || f->seen_ack) { /* Expected id? */
|
---|
| 541 | return; /* Nope, toss... */
|
---|
| 542 | }
|
---|
| 543 | if( !(f->callbacks->ackci? (*f->callbacks->ackci)(f, inp, len): (len == 0)) ) {
|
---|
| 544 | /* Ack is bad - ignore it */
|
---|
| 545 | FSMDEBUG(LOG_INFO, ("%s: received bad Ack (length %d)\n",
|
---|
| 546 | PROTO_NAME(f), len));
|
---|
| 547 | return;
|
---|
| 548 | }
|
---|
| 549 | f->seen_ack = 1;
|
---|
| 550 |
|
---|
| 551 | switch (f->state) {
|
---|
| 552 | case LS_CLOSED:
|
---|
| 553 | case LS_STOPPED:
|
---|
| 554 | fsm_sdata(f, TERMACK, (u_char)id, NULL, 0);
|
---|
| 555 | break;
|
---|
| 556 |
|
---|
| 557 | case LS_REQSENT:
|
---|
| 558 | f->state = LS_ACKRCVD;
|
---|
| 559 | f->retransmits = f->maxconfreqtransmits;
|
---|
| 560 | break;
|
---|
| 561 |
|
---|
| 562 | case LS_ACKRCVD:
|
---|
| 563 | /* Huh? an extra valid Ack? oh well... */
|
---|
| 564 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
|
---|
| 565 | fsm_sconfreq(f, 0);
|
---|
| 566 | f->state = LS_REQSENT;
|
---|
| 567 | break;
|
---|
| 568 |
|
---|
| 569 | case LS_ACKSENT:
|
---|
| 570 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
|
---|
| 571 | f->state = LS_OPENED;
|
---|
| 572 | f->retransmits = f->maxconfreqtransmits;
|
---|
| 573 | if (f->callbacks->up) {
|
---|
| 574 | (*f->callbacks->up)(f); /* Inform upper layers */
|
---|
| 575 | }
|
---|
| 576 | break;
|
---|
| 577 |
|
---|
| 578 | case LS_OPENED:
|
---|
| 579 | /* Go down and restart negotiation */
|
---|
| 580 | if (f->callbacks->down) {
|
---|
| 581 | (*f->callbacks->down)(f); /* Inform upper layers */
|
---|
| 582 | }
|
---|
| 583 | fsm_sconfreq(f, 0); /* Send initial Configure-Request */
|
---|
| 584 | f->state = LS_REQSENT;
|
---|
| 585 | break;
|
---|
| 586 | }
|
---|
| 587 | }
|
---|
| 588 |
|
---|
| 589 |
|
---|
| 590 | /*
|
---|
| 591 | * fsm_rconfnakrej - Receive Configure-Nak or Configure-Reject.
|
---|
| 592 | */
|
---|
| 593 | static void
|
---|
| 594 | fsm_rconfnakrej(fsm *f, int code, int id, u_char *inp, int len)
|
---|
| 595 | {
|
---|
| 596 | int (*proc) (fsm *, u_char *, int);
|
---|
| 597 | int ret;
|
---|
| 598 |
|
---|
| 599 | FSMDEBUG(LOG_INFO, ("fsm_rconfnakrej(%s): Rcvd id %d state=%d (%s)\n",
|
---|
| 600 | PROTO_NAME(f), id, f->state, ppperr_strerr[f->state]));
|
---|
| 601 |
|
---|
| 602 | if (id != f->reqid || f->seen_ack) { /* Expected id? */
|
---|
| 603 | return; /* Nope, toss... */
|
---|
| 604 | }
|
---|
| 605 | proc = (code == CONFNAK)? f->callbacks->nakci: f->callbacks->rejci;
|
---|
| 606 | if (!proc || !((ret = proc(f, inp, len)))) {
|
---|
| 607 | /* Nak/reject is bad - ignore it */
|
---|
| 608 | FSMDEBUG(LOG_INFO, ("%s: received bad %s (length %d)\n",
|
---|
| 609 | PROTO_NAME(f), (code==CONFNAK? "Nak": "reject"), len));
|
---|
| 610 | return;
|
---|
| 611 | }
|
---|
| 612 | f->seen_ack = 1;
|
---|
| 613 |
|
---|
| 614 | switch (f->state) {
|
---|
| 615 | case LS_CLOSED:
|
---|
| 616 | case LS_STOPPED:
|
---|
| 617 | fsm_sdata(f, TERMACK, (u_char)id, NULL, 0);
|
---|
| 618 | break;
|
---|
| 619 |
|
---|
| 620 | case LS_REQSENT:
|
---|
| 621 | case LS_ACKSENT:
|
---|
| 622 | /* They didn't agree to what we wanted - try another request */
|
---|
| 623 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
|
---|
| 624 | if (ret < 0) {
|
---|
| 625 | f->state = LS_STOPPED; /* kludge for stopping CCP */
|
---|
| 626 | } else {
|
---|
| 627 | fsm_sconfreq(f, 0); /* Send Configure-Request */
|
---|
| 628 | }
|
---|
| 629 | break;
|
---|
| 630 |
|
---|
| 631 | case LS_ACKRCVD:
|
---|
| 632 | /* Got a Nak/reject when we had already had an Ack?? oh well... */
|
---|
| 633 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
|
---|
| 634 | fsm_sconfreq(f, 0);
|
---|
| 635 | f->state = LS_REQSENT;
|
---|
| 636 | break;
|
---|
| 637 |
|
---|
| 638 | case LS_OPENED:
|
---|
| 639 | /* Go down and restart negotiation */
|
---|
| 640 | if (f->callbacks->down) {
|
---|
| 641 | (*f->callbacks->down)(f); /* Inform upper layers */
|
---|
| 642 | }
|
---|
| 643 | fsm_sconfreq(f, 0); /* Send initial Configure-Request */
|
---|
| 644 | f->state = LS_REQSENT;
|
---|
| 645 | break;
|
---|
| 646 | }
|
---|
| 647 | }
|
---|
| 648 |
|
---|
| 649 |
|
---|
| 650 | /*
|
---|
| 651 | * fsm_rtermreq - Receive Terminate-Req.
|
---|
| 652 | */
|
---|
| 653 | static void
|
---|
| 654 | fsm_rtermreq(fsm *f, int id, u_char *p, int len)
|
---|
| 655 | {
|
---|
| 656 | LWIP_UNUSED_ARG(p);
|
---|
| 657 |
|
---|
| 658 | FSMDEBUG(LOG_INFO, ("fsm_rtermreq(%s): Rcvd id %d state=%d (%s)\n",
|
---|
| 659 | PROTO_NAME(f), id, f->state, ppperr_strerr[f->state]));
|
---|
| 660 |
|
---|
| 661 | switch (f->state) {
|
---|
| 662 | case LS_ACKRCVD:
|
---|
| 663 | case LS_ACKSENT:
|
---|
| 664 | f->state = LS_REQSENT; /* Start over but keep trying */
|
---|
| 665 | break;
|
---|
| 666 |
|
---|
| 667 | case LS_OPENED:
|
---|
| 668 | if (len > 0) {
|
---|
| 669 | FSMDEBUG(LOG_INFO, ("%s terminated by peer (%p)\n", PROTO_NAME(f), p));
|
---|
| 670 | } else {
|
---|
| 671 | FSMDEBUG(LOG_INFO, ("%s terminated by peer\n", PROTO_NAME(f)));
|
---|
| 672 | }
|
---|
| 673 | if (f->callbacks->down) {
|
---|
| 674 | (*f->callbacks->down)(f); /* Inform upper layers */
|
---|
| 675 | }
|
---|
| 676 | f->retransmits = 0;
|
---|
| 677 | f->state = LS_STOPPING;
|
---|
| 678 | TIMEOUT(fsm_timeout, f, f->timeouttime);
|
---|
| 679 | break;
|
---|
| 680 | }
|
---|
| 681 |
|
---|
| 682 | fsm_sdata(f, TERMACK, (u_char)id, NULL, 0);
|
---|
| 683 | }
|
---|
| 684 |
|
---|
| 685 |
|
---|
| 686 | /*
|
---|
| 687 | * fsm_rtermack - Receive Terminate-Ack.
|
---|
| 688 | */
|
---|
| 689 | static void
|
---|
| 690 | fsm_rtermack(fsm *f)
|
---|
| 691 | {
|
---|
| 692 | FSMDEBUG(LOG_INFO, ("fsm_rtermack(%s): state=%d (%s)\n",
|
---|
| 693 | PROTO_NAME(f), f->state, ppperr_strerr[f->state]));
|
---|
| 694 |
|
---|
| 695 | switch (f->state) {
|
---|
| 696 | case LS_CLOSING:
|
---|
| 697 | UNTIMEOUT(fsm_timeout, f);
|
---|
| 698 | f->state = LS_CLOSED;
|
---|
| 699 | if( f->callbacks->finished ) {
|
---|
| 700 | (*f->callbacks->finished)(f);
|
---|
| 701 | }
|
---|
| 702 | break;
|
---|
| 703 |
|
---|
| 704 | case LS_STOPPING:
|
---|
| 705 | UNTIMEOUT(fsm_timeout, f);
|
---|
| 706 | f->state = LS_STOPPED;
|
---|
| 707 | if( f->callbacks->finished ) {
|
---|
| 708 | (*f->callbacks->finished)(f);
|
---|
| 709 | }
|
---|
| 710 | break;
|
---|
| 711 |
|
---|
| 712 | case LS_ACKRCVD:
|
---|
| 713 | f->state = LS_REQSENT;
|
---|
| 714 | break;
|
---|
| 715 |
|
---|
| 716 | case LS_OPENED:
|
---|
| 717 | if (f->callbacks->down) {
|
---|
| 718 | (*f->callbacks->down)(f); /* Inform upper layers */
|
---|
| 719 | }
|
---|
| 720 | fsm_sconfreq(f, 0);
|
---|
| 721 | break;
|
---|
| 722 | default:
|
---|
| 723 | FSMDEBUG(LOG_INFO, ("fsm_rtermack(%s): UNHANDLED state=%d (%s)!!!\n",
|
---|
| 724 | PROTO_NAME(f), f->state, ppperr_strerr[f->state]));
|
---|
| 725 | }
|
---|
| 726 | }
|
---|
| 727 |
|
---|
| 728 |
|
---|
| 729 | /*
|
---|
| 730 | * fsm_rcoderej - Receive an Code-Reject.
|
---|
| 731 | */
|
---|
| 732 | static void
|
---|
| 733 | fsm_rcoderej(fsm *f, u_char *inp, int len)
|
---|
| 734 | {
|
---|
| 735 | u_char code, id;
|
---|
| 736 |
|
---|
| 737 | FSMDEBUG(LOG_INFO, ("fsm_rcoderej(%s): state=%d (%s)\n",
|
---|
| 738 | PROTO_NAME(f), f->state, ppperr_strerr[f->state]));
|
---|
| 739 |
|
---|
| 740 | if (len < HEADERLEN) {
|
---|
| 741 | FSMDEBUG(LOG_INFO, ("fsm_rcoderej: Rcvd short Code-Reject packet!\n"));
|
---|
| 742 | return;
|
---|
| 743 | }
|
---|
| 744 | GETCHAR(code, inp);
|
---|
| 745 | GETCHAR(id, inp);
|
---|
| 746 | FSMDEBUG(LOG_WARNING, ("%s: Rcvd Code-Reject for code %d, id %d\n",
|
---|
| 747 | PROTO_NAME(f), code, id));
|
---|
| 748 |
|
---|
| 749 | if( f->state == LS_ACKRCVD ) {
|
---|
| 750 | f->state = LS_REQSENT;
|
---|
| 751 | }
|
---|
| 752 | }
|
---|
| 753 |
|
---|
| 754 |
|
---|
| 755 | /*
|
---|
| 756 | * fsm_protreject - Peer doesn't speak this protocol.
|
---|
| 757 | *
|
---|
| 758 | * Treat this as a catastrophic error (RXJ-).
|
---|
| 759 | */
|
---|
| 760 | void
|
---|
| 761 | fsm_protreject(fsm *f)
|
---|
| 762 | {
|
---|
| 763 | switch( f->state ) {
|
---|
| 764 | case LS_CLOSING:
|
---|
| 765 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
|
---|
| 766 | /* fall through */
|
---|
| 767 | case LS_CLOSED:
|
---|
| 768 | f->state = LS_CLOSED;
|
---|
| 769 | if( f->callbacks->finished ) {
|
---|
| 770 | (*f->callbacks->finished)(f);
|
---|
| 771 | }
|
---|
| 772 | break;
|
---|
| 773 |
|
---|
| 774 | case LS_STOPPING:
|
---|
| 775 | case LS_REQSENT:
|
---|
| 776 | case LS_ACKRCVD:
|
---|
| 777 | case LS_ACKSENT:
|
---|
| 778 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
|
---|
| 779 | /* fall through */
|
---|
| 780 | case LS_STOPPED:
|
---|
| 781 | f->state = LS_STOPPED;
|
---|
| 782 | if( f->callbacks->finished ) {
|
---|
| 783 | (*f->callbacks->finished)(f);
|
---|
| 784 | }
|
---|
| 785 | break;
|
---|
| 786 |
|
---|
| 787 | case LS_OPENED:
|
---|
| 788 | if( f->callbacks->down ) {
|
---|
| 789 | (*f->callbacks->down)(f);
|
---|
| 790 | }
|
---|
| 791 | /* Init restart counter, send Terminate-Request */
|
---|
| 792 | f->retransmits = f->maxtermtransmits;
|
---|
| 793 | fsm_sdata(f, TERMREQ, f->reqid = ++f->id,
|
---|
| 794 | (u_char *) f->term_reason, f->term_reason_len);
|
---|
| 795 | TIMEOUT(fsm_timeout, f, f->timeouttime);
|
---|
| 796 | --f->retransmits;
|
---|
| 797 |
|
---|
| 798 | f->state = LS_STOPPING;
|
---|
| 799 | break;
|
---|
| 800 |
|
---|
| 801 | default:
|
---|
| 802 | FSMDEBUG(LOG_INFO, ("%s: Protocol-reject event in state %d (%s)!\n",
|
---|
| 803 | PROTO_NAME(f), f->state, ppperr_strerr[f->state]));
|
---|
| 804 | }
|
---|
| 805 | }
|
---|
| 806 |
|
---|
| 807 |
|
---|
| 808 | /*
|
---|
| 809 | * fsm_sconfreq - Send a Configure-Request.
|
---|
| 810 | */
|
---|
| 811 | static void
|
---|
| 812 | fsm_sconfreq(fsm *f, int retransmit)
|
---|
| 813 | {
|
---|
| 814 | u_char *outp;
|
---|
| 815 | int cilen;
|
---|
| 816 |
|
---|
| 817 | if( f->state != LS_REQSENT && f->state != LS_ACKRCVD && f->state != LS_ACKSENT ) {
|
---|
| 818 | /* Not currently negotiating - reset options */
|
---|
| 819 | if( f->callbacks->resetci ) {
|
---|
| 820 | (*f->callbacks->resetci)(f);
|
---|
| 821 | }
|
---|
| 822 | f->nakloops = 0;
|
---|
| 823 | }
|
---|
| 824 |
|
---|
| 825 | if( !retransmit ) {
|
---|
| 826 | /* New request - reset retransmission counter, use new ID */
|
---|
| 827 | f->retransmits = f->maxconfreqtransmits;
|
---|
| 828 | f->reqid = ++f->id;
|
---|
| 829 | }
|
---|
| 830 |
|
---|
| 831 | f->seen_ack = 0;
|
---|
| 832 |
|
---|
| 833 | /*
|
---|
| 834 | * Make up the request packet
|
---|
| 835 | */
|
---|
| 836 | outp = outpacket_buf[f->unit] + PPP_HDRLEN + HEADERLEN;
|
---|
| 837 | if( f->callbacks->cilen && f->callbacks->addci ) {
|
---|
| 838 | cilen = (*f->callbacks->cilen)(f);
|
---|
| 839 | if( cilen > peer_mru[f->unit] - (int)HEADERLEN ) {
|
---|
| 840 | cilen = peer_mru[f->unit] - HEADERLEN;
|
---|
| 841 | }
|
---|
| 842 | if (f->callbacks->addci) {
|
---|
| 843 | (*f->callbacks->addci)(f, outp, &cilen);
|
---|
| 844 | }
|
---|
| 845 | } else {
|
---|
| 846 | cilen = 0;
|
---|
| 847 | }
|
---|
| 848 |
|
---|
| 849 | /* send the request to our peer */
|
---|
| 850 | fsm_sdata(f, CONFREQ, f->reqid, outp, cilen);
|
---|
| 851 |
|
---|
| 852 | /* start the retransmit timer */
|
---|
| 853 | --f->retransmits;
|
---|
| 854 | TIMEOUT(fsm_timeout, f, f->timeouttime);
|
---|
| 855 |
|
---|
| 856 | FSMDEBUG(LOG_INFO, ("%s: sending Configure-Request, id %d\n",
|
---|
| 857 | PROTO_NAME(f), f->reqid));
|
---|
| 858 | }
|
---|
| 859 |
|
---|
| 860 |
|
---|
| 861 | /*
|
---|
| 862 | * fsm_sdata - Send some data.
|
---|
| 863 | *
|
---|
| 864 | * Used for all packets sent to our peer by this module.
|
---|
| 865 | */
|
---|
| 866 | void
|
---|
| 867 | fsm_sdata( fsm *f, u_char code, u_char id, u_char *data, int datalen)
|
---|
| 868 | {
|
---|
| 869 | u_char *outp;
|
---|
| 870 | int outlen;
|
---|
| 871 |
|
---|
| 872 | /* Adjust length to be smaller than MTU */
|
---|
| 873 | outp = outpacket_buf[f->unit];
|
---|
| 874 | if (datalen > peer_mru[f->unit] - (int)HEADERLEN) {
|
---|
| 875 | datalen = peer_mru[f->unit] - HEADERLEN;
|
---|
| 876 | }
|
---|
| 877 | if (datalen && data != outp + PPP_HDRLEN + HEADERLEN) {
|
---|
| 878 | BCOPY(data, outp + PPP_HDRLEN + HEADERLEN, datalen);
|
---|
| 879 | }
|
---|
| 880 | outlen = datalen + HEADERLEN;
|
---|
| 881 | MAKEHEADER(outp, f->protocol);
|
---|
| 882 | PUTCHAR(code, outp);
|
---|
| 883 | PUTCHAR(id, outp);
|
---|
| 884 | PUTSHORT(outlen, outp);
|
---|
| 885 | pppWrite(f->unit, outpacket_buf[f->unit], outlen + PPP_HDRLEN);
|
---|
| 886 | FSMDEBUG(LOG_INFO, ("fsm_sdata(%s): Sent code %d,%d,%d.\n",
|
---|
| 887 | PROTO_NAME(f), code, id, outlen));
|
---|
| 888 | }
|
---|
| 889 |
|
---|
| 890 | #endif /* PPP_SUPPORT */
|
---|