[457] | 1 | /*
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| 2 | * fsm.c - {Link, IP} Control Protocol Finite State Machine.
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| 3 | *
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| 4 | * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
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| 5 | *
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| 6 | * Redistribution and use in source and binary forms, with or without
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| 7 | * modification, are permitted provided that the following conditions
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| 8 | * are met:
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| 9 | *
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| 10 | * 1. Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | *
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| 13 | * 2. Redistributions in binary form must reproduce the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer in
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| 15 | * the documentation and/or other materials provided with the
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| 16 | * distribution.
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| 17 | *
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| 18 | * 3. The name "Carnegie Mellon University" must not be used to
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| 19 | * endorse or promote products derived from this software without
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| 20 | * prior written permission. For permission or any legal
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| 21 | * details, please contact
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| 22 | * Office of Technology Transfer
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| 23 | * Carnegie Mellon University
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| 24 | * 5000 Forbes Avenue
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| 25 | * Pittsburgh, PA 15213-3890
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| 26 | * (412) 268-4387, fax: (412) 268-7395
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| 27 | * tech-transfer@andrew.cmu.edu
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| 28 | *
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| 29 | * 4. Redistributions of any form whatsoever must retain the following
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| 30 | * acknowledgment:
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| 31 | * "This product includes software developed by Computing Services
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| 32 | * at Carnegie Mellon University (http://www.cmu.edu/computing/)."
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| 33 | *
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| 34 | * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
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| 35 | * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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| 36 | * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
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| 37 | * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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| 38 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
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| 39 | * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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| 40 | * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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| 41 | */
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| 42 |
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| 43 | #include "netif/ppp/ppp_opts.h"
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| 44 | #if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
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| 45 |
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| 46 | /*
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| 47 | * @todo:
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| 48 | * Randomize fsm id on link/init.
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| 49 | * Deal with variable outgoing MTU.
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| 50 | */
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| 51 |
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| 52 | #if 0 /* UNUSED */
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| 53 | #include <stdio.h>
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| 54 | #include <string.h>
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| 55 | #include <sys/types.h>
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| 56 | #endif /* UNUSED */
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| 57 |
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| 58 | #include "netif/ppp/ppp_impl.h"
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| 59 |
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| 60 | #include "netif/ppp/fsm.h"
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| 61 |
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| 62 | static void fsm_timeout (void *);
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| 63 | static void fsm_rconfreq(fsm *f, u_char id, u_char *inp, int len);
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| 64 | static void fsm_rconfack(fsm *f, int id, u_char *inp, int len);
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| 65 | static void fsm_rconfnakrej(fsm *f, int code, int id, u_char *inp, int len);
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| 66 | static void fsm_rtermreq(fsm *f, int id, u_char *p, int len);
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| 67 | static void fsm_rtermack(fsm *f);
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| 68 | static void fsm_rcoderej(fsm *f, u_char *inp, int len);
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| 69 | static void fsm_sconfreq(fsm *f, int retransmit);
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| 70 |
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| 71 | #define PROTO_NAME(f) ((f)->callbacks->proto_name)
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| 72 |
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| 73 | /*
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| 74 | * fsm_init - Initialize fsm.
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| 75 | *
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| 76 | * Initialize fsm state.
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| 77 | */
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| 78 | void fsm_init(fsm *f) {
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| 79 | ppp_pcb *pcb = f->pcb;
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| 80 | f->state = PPP_FSM_INITIAL;
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| 81 | f->flags = 0;
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| 82 | f->id = 0; /* XXX Start with random id? */
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| 83 | f->maxnakloops = pcb->settings.fsm_max_nak_loops;
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| 84 | f->term_reason_len = 0;
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| 85 | }
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| 86 |
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| 87 |
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| 88 | /*
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| 89 | * fsm_lowerup - The lower layer is up.
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| 90 | */
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| 91 | void fsm_lowerup(fsm *f) {
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| 92 | switch( f->state ){
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| 93 | case PPP_FSM_INITIAL:
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| 94 | f->state = PPP_FSM_CLOSED;
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| 95 | break;
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| 96 |
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| 97 | case PPP_FSM_STARTING:
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| 98 | if( f->flags & OPT_SILENT )
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| 99 | f->state = PPP_FSM_STOPPED;
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| 100 | else {
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| 101 | /* Send an initial configure-request */
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| 102 | fsm_sconfreq(f, 0);
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| 103 | f->state = PPP_FSM_REQSENT;
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| 104 | }
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| 105 | break;
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| 106 |
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| 107 | default:
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| 108 | FSMDEBUG(("%s: Up event in state %d!", PROTO_NAME(f), f->state));
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| 109 | /* no break */
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| 110 | }
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| 111 | }
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| 112 |
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| 113 |
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| 114 | /*
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| 115 | * fsm_lowerdown - The lower layer is down.
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| 116 | *
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| 117 | * Cancel all timeouts and inform upper layers.
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| 118 | */
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| 119 | void fsm_lowerdown(fsm *f) {
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| 120 | switch( f->state ){
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| 121 | case PPP_FSM_CLOSED:
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| 122 | f->state = PPP_FSM_INITIAL;
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| 123 | break;
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| 124 |
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| 125 | case PPP_FSM_STOPPED:
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| 126 | f->state = PPP_FSM_STARTING;
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| 127 | if( f->callbacks->starting )
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| 128 | (*f->callbacks->starting)(f);
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| 129 | break;
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| 130 |
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| 131 | case PPP_FSM_CLOSING:
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| 132 | f->state = PPP_FSM_INITIAL;
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| 133 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
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| 134 | break;
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| 135 |
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| 136 | case PPP_FSM_STOPPING:
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| 137 | case PPP_FSM_REQSENT:
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| 138 | case PPP_FSM_ACKRCVD:
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| 139 | case PPP_FSM_ACKSENT:
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| 140 | f->state = PPP_FSM_STARTING;
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| 141 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
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| 142 | break;
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| 143 |
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| 144 | case PPP_FSM_OPENED:
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| 145 | if( f->callbacks->down )
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| 146 | (*f->callbacks->down)(f);
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| 147 | f->state = PPP_FSM_STARTING;
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| 148 | break;
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| 149 |
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| 150 | default:
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| 151 | FSMDEBUG(("%s: Down event in state %d!", PROTO_NAME(f), f->state));
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| 152 | /* no break */
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| 153 | }
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| 154 | }
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| 155 |
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| 156 |
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| 157 | /*
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| 158 | * fsm_open - Link is allowed to come up.
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| 159 | */
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| 160 | void fsm_open(fsm *f) {
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| 161 | switch( f->state ){
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| 162 | case PPP_FSM_INITIAL:
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| 163 | f->state = PPP_FSM_STARTING;
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| 164 | if( f->callbacks->starting )
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| 165 | (*f->callbacks->starting)(f);
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| 166 | break;
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| 167 |
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| 168 | case PPP_FSM_CLOSED:
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| 169 | if( f->flags & OPT_SILENT )
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| 170 | f->state = PPP_FSM_STOPPED;
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| 171 | else {
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| 172 | /* Send an initial configure-request */
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| 173 | fsm_sconfreq(f, 0);
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| 174 | f->state = PPP_FSM_REQSENT;
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| 175 | }
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| 176 | break;
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| 177 |
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| 178 | case PPP_FSM_CLOSING:
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| 179 | f->state = PPP_FSM_STOPPING;
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| 180 | /* fall through */
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| 181 | /* no break */
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| 182 | case PPP_FSM_STOPPED:
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| 183 | case PPP_FSM_OPENED:
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| 184 | if( f->flags & OPT_RESTART ){
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| 185 | fsm_lowerdown(f);
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| 186 | fsm_lowerup(f);
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| 187 | }
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| 188 | break;
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| 189 | default:
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| 190 | break;
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| 191 | }
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| 192 | }
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| 193 |
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| 194 | /*
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| 195 | * terminate_layer - Start process of shutting down the FSM
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| 196 | *
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| 197 | * Cancel any timeout running, notify upper layers we're done, and
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| 198 | * send a terminate-request message as configured.
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| 199 | */
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| 200 | static void terminate_layer(fsm *f, int nextstate) {
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| 201 | ppp_pcb *pcb = f->pcb;
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| 202 |
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| 203 | if( f->state != PPP_FSM_OPENED )
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| 204 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
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| 205 | else if( f->callbacks->down )
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| 206 | (*f->callbacks->down)(f); /* Inform upper layers we're down */
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| 207 |
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| 208 | /* Init restart counter and send Terminate-Request */
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| 209 | f->retransmits = pcb->settings.fsm_max_term_transmits;
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| 210 | fsm_sdata(f, TERMREQ, f->reqid = ++f->id,
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| 211 | (const u_char *) f->term_reason, f->term_reason_len);
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| 212 |
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| 213 | if (f->retransmits == 0) {
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| 214 | /*
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| 215 | * User asked for no terminate requests at all; just close it.
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| 216 | * We've already fired off one Terminate-Request just to be nice
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| 217 | * to the peer, but we're not going to wait for a reply.
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| 218 | */
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| 219 | f->state = nextstate == PPP_FSM_CLOSING ? PPP_FSM_CLOSED : PPP_FSM_STOPPED;
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| 220 | if( f->callbacks->finished )
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| 221 | (*f->callbacks->finished)(f);
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| 222 | return;
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| 223 | }
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| 224 |
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| 225 | TIMEOUT(fsm_timeout, f, pcb->settings.fsm_timeout_time);
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| 226 | --f->retransmits;
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| 227 |
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| 228 | f->state = nextstate;
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| 229 | }
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| 230 |
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| 231 | /*
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| 232 | * fsm_close - Start closing connection.
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| 233 | *
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| 234 | * Cancel timeouts and either initiate close or possibly go directly to
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| 235 | * the PPP_FSM_CLOSED state.
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| 236 | */
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| 237 | void fsm_close(fsm *f, const char *reason) {
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| 238 | f->term_reason = reason;
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| 239 | f->term_reason_len = (reason == NULL? 0: (u8_t)LWIP_MIN(strlen(reason), 0xFF) );
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| 240 | switch( f->state ){
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| 241 | case PPP_FSM_STARTING:
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| 242 | f->state = PPP_FSM_INITIAL;
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| 243 | break;
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| 244 | case PPP_FSM_STOPPED:
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| 245 | f->state = PPP_FSM_CLOSED;
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| 246 | break;
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| 247 | case PPP_FSM_STOPPING:
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| 248 | f->state = PPP_FSM_CLOSING;
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| 249 | break;
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| 250 |
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| 251 | case PPP_FSM_REQSENT:
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| 252 | case PPP_FSM_ACKRCVD:
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| 253 | case PPP_FSM_ACKSENT:
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| 254 | case PPP_FSM_OPENED:
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| 255 | terminate_layer(f, PPP_FSM_CLOSING);
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| 256 | break;
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| 257 | default:
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| 258 | break;
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| 259 | }
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| 260 | }
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| 261 |
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| 262 |
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| 263 | /*
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| 264 | * fsm_timeout - Timeout expired.
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| 265 | */
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| 266 | static void fsm_timeout(void *arg) {
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| 267 | fsm *f = (fsm *) arg;
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| 268 | ppp_pcb *pcb = f->pcb;
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| 269 |
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| 270 | switch (f->state) {
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| 271 | case PPP_FSM_CLOSING:
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| 272 | case PPP_FSM_STOPPING:
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| 273 | if( f->retransmits <= 0 ){
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| 274 | /*
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| 275 | * We've waited for an ack long enough. Peer probably heard us.
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| 276 | */
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| 277 | f->state = (f->state == PPP_FSM_CLOSING)? PPP_FSM_CLOSED: PPP_FSM_STOPPED;
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| 278 | if( f->callbacks->finished )
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| 279 | (*f->callbacks->finished)(f);
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| 280 | } else {
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| 281 | /* Send Terminate-Request */
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| 282 | fsm_sdata(f, TERMREQ, f->reqid = ++f->id,
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| 283 | (const u_char *) f->term_reason, f->term_reason_len);
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| 284 | TIMEOUT(fsm_timeout, f, pcb->settings.fsm_timeout_time);
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| 285 | --f->retransmits;
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| 286 | }
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| 287 | break;
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| 288 |
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| 289 | case PPP_FSM_REQSENT:
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| 290 | case PPP_FSM_ACKRCVD:
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| 291 | case PPP_FSM_ACKSENT:
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| 292 | if (f->retransmits <= 0) {
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| 293 | ppp_warn("%s: timeout sending Config-Requests", PROTO_NAME(f));
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| 294 | f->state = PPP_FSM_STOPPED;
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| 295 | if( (f->flags & OPT_PASSIVE) == 0 && f->callbacks->finished )
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| 296 | (*f->callbacks->finished)(f);
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| 297 |
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| 298 | } else {
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| 299 | /* Retransmit the configure-request */
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| 300 | if (f->callbacks->retransmit)
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| 301 | (*f->callbacks->retransmit)(f);
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| 302 | fsm_sconfreq(f, 1); /* Re-send Configure-Request */
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| 303 | if( f->state == PPP_FSM_ACKRCVD )
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| 304 | f->state = PPP_FSM_REQSENT;
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| 305 | }
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| 306 | break;
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| 307 |
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| 308 | default:
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| 309 | FSMDEBUG(("%s: Timeout event in state %d!", PROTO_NAME(f), f->state));
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| 310 | /* no break */
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| 311 | }
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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_input - Input packet.
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| 317 | */
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| 318 | void fsm_input(fsm *f, u_char *inpacket, int l) {
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| 319 | u_char *inp;
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| 320 | u_char code, id;
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| 321 | int len;
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| 322 |
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| 323 | /*
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| 324 | * Parse header (code, id and length).
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| 325 | * If packet too short, drop it.
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| 326 | */
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| 327 | inp = inpacket;
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| 328 | if (l < HEADERLEN) {
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| 329 | FSMDEBUG(("fsm_input(%x): Rcvd short header.", f->protocol));
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| 330 | return;
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| 331 | }
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| 332 | GETCHAR(code, inp);
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| 333 | GETCHAR(id, inp);
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| 334 | GETSHORT(len, inp);
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| 335 | if (len < HEADERLEN) {
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| 336 | FSMDEBUG(("fsm_input(%x): Rcvd illegal length.", f->protocol));
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| 337 | return;
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| 338 | }
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| 339 | if (len > l) {
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| 340 | FSMDEBUG(("fsm_input(%x): Rcvd short packet.", f->protocol));
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| 341 | return;
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| 342 | }
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| 343 | len -= HEADERLEN; /* subtract header length */
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| 344 |
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| 345 | if( f->state == PPP_FSM_INITIAL || f->state == PPP_FSM_STARTING ){
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| 346 | FSMDEBUG(("fsm_input(%x): Rcvd packet in state %d.",
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| 347 | f->protocol, f->state));
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| 348 | return;
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| 349 | }
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| 350 |
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| 351 | /*
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| 352 | * Action depends on code.
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| 353 | */
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| 354 | switch (code) {
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| 355 | case CONFREQ:
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| 356 | fsm_rconfreq(f, id, inp, len);
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| 357 | break;
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| 358 |
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| 359 | case CONFACK:
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| 360 | fsm_rconfack(f, id, inp, len);
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| 361 | break;
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| 362 |
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| 363 | case CONFNAK:
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| 364 | case CONFREJ:
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| 365 | fsm_rconfnakrej(f, code, id, inp, len);
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| 366 | break;
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| 367 |
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| 368 | case TERMREQ:
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| 369 | fsm_rtermreq(f, id, inp, len);
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| 370 | break;
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| 371 |
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| 372 | case TERMACK:
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| 373 | fsm_rtermack(f);
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| 374 | break;
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| 375 |
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| 376 | case CODEREJ:
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| 377 | fsm_rcoderej(f, inp, len);
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| 378 | break;
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| 379 |
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| 380 | default:
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| 381 | if( !f->callbacks->extcode
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| 382 | || !(*f->callbacks->extcode)(f, code, id, inp, len) )
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| 383 | fsm_sdata(f, CODEREJ, ++f->id, inpacket, len + HEADERLEN);
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| 384 | break;
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| 385 | }
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| 386 | }
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| 387 |
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| 388 |
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| 389 | /*
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| 390 | * fsm_rconfreq - Receive Configure-Request.
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| 391 | */
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| 392 | static void fsm_rconfreq(fsm *f, u_char id, u_char *inp, int len) {
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| 393 | int code, reject_if_disagree;
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| 394 |
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| 395 | switch( f->state ){
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| 396 | case PPP_FSM_CLOSED:
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| 397 | /* Go away, we're closed */
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| 398 | fsm_sdata(f, TERMACK, id, NULL, 0);
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| 399 | return;
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| 400 | case PPP_FSM_CLOSING:
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| 401 | case PPP_FSM_STOPPING:
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| 402 | return;
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| 403 |
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| 404 | case PPP_FSM_OPENED:
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| 405 | /* Go down and restart negotiation */
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| 406 | if( f->callbacks->down )
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| 407 | (*f->callbacks->down)(f); /* Inform upper layers */
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| 408 | fsm_sconfreq(f, 0); /* Send initial Configure-Request */
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| 409 | f->state = PPP_FSM_REQSENT;
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| 410 | break;
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| 411 |
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| 412 | case PPP_FSM_STOPPED:
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| 413 | /* Negotiation started by our peer */
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| 414 | fsm_sconfreq(f, 0); /* Send initial Configure-Request */
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| 415 | f->state = PPP_FSM_REQSENT;
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| 416 | break;
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| 417 | default:
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| 418 | break;
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| 419 | }
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| 420 |
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| 421 | /*
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| 422 | * Pass the requested configuration options
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| 423 | * to protocol-specific code for checking.
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| 424 | */
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| 425 | if (f->callbacks->reqci){ /* Check CI */
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| 426 | reject_if_disagree = (f->nakloops >= f->maxnakloops);
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| 427 | code = (*f->callbacks->reqci)(f, inp, &len, reject_if_disagree);
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| 428 | } else if (len)
|
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| 429 | code = CONFREJ; /* Reject all CI */
|
---|
| 430 | else
|
---|
| 431 | code = CONFACK;
|
---|
| 432 |
|
---|
| 433 | /* send the Ack, Nak or Rej to the peer */
|
---|
| 434 | fsm_sdata(f, code, id, inp, len);
|
---|
| 435 |
|
---|
| 436 | if (code == CONFACK) {
|
---|
| 437 | if (f->state == PPP_FSM_ACKRCVD) {
|
---|
| 438 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
|
---|
| 439 | f->state = PPP_FSM_OPENED;
|
---|
| 440 | if (f->callbacks->up)
|
---|
| 441 | (*f->callbacks->up)(f); /* Inform upper layers */
|
---|
| 442 | } else
|
---|
| 443 | f->state = PPP_FSM_ACKSENT;
|
---|
| 444 | f->nakloops = 0;
|
---|
| 445 |
|
---|
| 446 | } else {
|
---|
| 447 | /* we sent CONFACK or CONFREJ */
|
---|
| 448 | if (f->state != PPP_FSM_ACKRCVD)
|
---|
| 449 | f->state = PPP_FSM_REQSENT;
|
---|
| 450 | if( code == CONFNAK )
|
---|
| 451 | ++f->nakloops;
|
---|
| 452 | }
|
---|
| 453 | }
|
---|
| 454 |
|
---|
| 455 |
|
---|
| 456 | /*
|
---|
| 457 | * fsm_rconfack - Receive Configure-Ack.
|
---|
| 458 | */
|
---|
| 459 | static void fsm_rconfack(fsm *f, int id, u_char *inp, int len) {
|
---|
| 460 | ppp_pcb *pcb = f->pcb;
|
---|
| 461 |
|
---|
| 462 | if (id != f->reqid || f->seen_ack) /* Expected id? */
|
---|
| 463 | return; /* Nope, toss... */
|
---|
| 464 | if( !(f->callbacks->ackci? (*f->callbacks->ackci)(f, inp, len):
|
---|
| 465 | (len == 0)) ){
|
---|
| 466 | /* Ack is bad - ignore it */
|
---|
| 467 | ppp_error("Received bad configure-ack: %P", inp, len);
|
---|
| 468 | return;
|
---|
| 469 | }
|
---|
| 470 | f->seen_ack = 1;
|
---|
| 471 | f->rnakloops = 0;
|
---|
| 472 |
|
---|
| 473 | switch (f->state) {
|
---|
| 474 | case PPP_FSM_CLOSED:
|
---|
| 475 | case PPP_FSM_STOPPED:
|
---|
| 476 | fsm_sdata(f, TERMACK, id, NULL, 0);
|
---|
| 477 | break;
|
---|
| 478 |
|
---|
| 479 | case PPP_FSM_REQSENT:
|
---|
| 480 | f->state = PPP_FSM_ACKRCVD;
|
---|
| 481 | f->retransmits = pcb->settings.fsm_max_conf_req_transmits;
|
---|
| 482 | break;
|
---|
| 483 |
|
---|
| 484 | case PPP_FSM_ACKRCVD:
|
---|
| 485 | /* Huh? an extra valid Ack? oh well... */
|
---|
| 486 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
|
---|
| 487 | fsm_sconfreq(f, 0);
|
---|
| 488 | f->state = PPP_FSM_REQSENT;
|
---|
| 489 | break;
|
---|
| 490 |
|
---|
| 491 | case PPP_FSM_ACKSENT:
|
---|
| 492 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
|
---|
| 493 | f->state = PPP_FSM_OPENED;
|
---|
| 494 | f->retransmits = pcb->settings.fsm_max_conf_req_transmits;
|
---|
| 495 | if (f->callbacks->up)
|
---|
| 496 | (*f->callbacks->up)(f); /* Inform upper layers */
|
---|
| 497 | break;
|
---|
| 498 |
|
---|
| 499 | case PPP_FSM_OPENED:
|
---|
| 500 | /* Go down and restart negotiation */
|
---|
| 501 | if (f->callbacks->down)
|
---|
| 502 | (*f->callbacks->down)(f); /* Inform upper layers */
|
---|
| 503 | fsm_sconfreq(f, 0); /* Send initial Configure-Request */
|
---|
| 504 | f->state = PPP_FSM_REQSENT;
|
---|
| 505 | break;
|
---|
| 506 | default:
|
---|
| 507 | break;
|
---|
| 508 | }
|
---|
| 509 | }
|
---|
| 510 |
|
---|
| 511 |
|
---|
| 512 | /*
|
---|
| 513 | * fsm_rconfnakrej - Receive Configure-Nak or Configure-Reject.
|
---|
| 514 | */
|
---|
| 515 | static void fsm_rconfnakrej(fsm *f, int code, int id, u_char *inp, int len) {
|
---|
| 516 | int ret;
|
---|
| 517 | int treat_as_reject;
|
---|
| 518 |
|
---|
| 519 | if (id != f->reqid || f->seen_ack) /* Expected id? */
|
---|
| 520 | return; /* Nope, toss... */
|
---|
| 521 |
|
---|
| 522 | if (code == CONFNAK) {
|
---|
| 523 | ++f->rnakloops;
|
---|
| 524 | treat_as_reject = (f->rnakloops >= f->maxnakloops);
|
---|
| 525 | if (f->callbacks->nakci == NULL
|
---|
| 526 | || !(ret = f->callbacks->nakci(f, inp, len, treat_as_reject))) {
|
---|
| 527 | ppp_error("Received bad configure-nak: %P", inp, len);
|
---|
| 528 | return;
|
---|
| 529 | }
|
---|
| 530 | } else {
|
---|
| 531 | f->rnakloops = 0;
|
---|
| 532 | if (f->callbacks->rejci == NULL
|
---|
| 533 | || !(ret = f->callbacks->rejci(f, inp, len))) {
|
---|
| 534 | ppp_error("Received bad configure-rej: %P", inp, len);
|
---|
| 535 | return;
|
---|
| 536 | }
|
---|
| 537 | }
|
---|
| 538 |
|
---|
| 539 | f->seen_ack = 1;
|
---|
| 540 |
|
---|
| 541 | switch (f->state) {
|
---|
| 542 | case PPP_FSM_CLOSED:
|
---|
| 543 | case PPP_FSM_STOPPED:
|
---|
| 544 | fsm_sdata(f, TERMACK, id, NULL, 0);
|
---|
| 545 | break;
|
---|
| 546 |
|
---|
| 547 | case PPP_FSM_REQSENT:
|
---|
| 548 | case PPP_FSM_ACKSENT:
|
---|
| 549 | /* They didn't agree to what we wanted - try another request */
|
---|
| 550 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
|
---|
| 551 | if (ret < 0)
|
---|
| 552 | f->state = PPP_FSM_STOPPED; /* kludge for stopping CCP */
|
---|
| 553 | else
|
---|
| 554 | fsm_sconfreq(f, 0); /* Send Configure-Request */
|
---|
| 555 | break;
|
---|
| 556 |
|
---|
| 557 | case PPP_FSM_ACKRCVD:
|
---|
| 558 | /* Got a Nak/reject when we had already had an Ack?? oh well... */
|
---|
| 559 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
|
---|
| 560 | fsm_sconfreq(f, 0);
|
---|
| 561 | f->state = PPP_FSM_REQSENT;
|
---|
| 562 | break;
|
---|
| 563 |
|
---|
| 564 | case PPP_FSM_OPENED:
|
---|
| 565 | /* Go down and restart negotiation */
|
---|
| 566 | if (f->callbacks->down)
|
---|
| 567 | (*f->callbacks->down)(f); /* Inform upper layers */
|
---|
| 568 | fsm_sconfreq(f, 0); /* Send initial Configure-Request */
|
---|
| 569 | f->state = PPP_FSM_REQSENT;
|
---|
| 570 | break;
|
---|
| 571 | default:
|
---|
| 572 | break;
|
---|
| 573 | }
|
---|
| 574 | }
|
---|
| 575 |
|
---|
| 576 |
|
---|
| 577 | /*
|
---|
| 578 | * fsm_rtermreq - Receive Terminate-Req.
|
---|
| 579 | */
|
---|
| 580 | static void fsm_rtermreq(fsm *f, int id, u_char *p, int len) {
|
---|
| 581 | ppp_pcb *pcb = f->pcb;
|
---|
| 582 |
|
---|
| 583 | switch (f->state) {
|
---|
| 584 | case PPP_FSM_ACKRCVD:
|
---|
| 585 | case PPP_FSM_ACKSENT:
|
---|
| 586 | f->state = PPP_FSM_REQSENT; /* Start over but keep trying */
|
---|
| 587 | break;
|
---|
| 588 |
|
---|
| 589 | case PPP_FSM_OPENED:
|
---|
| 590 | if (len > 0) {
|
---|
| 591 | ppp_info("%s terminated by peer (%0.*v)", PROTO_NAME(f), len, p);
|
---|
| 592 | } else
|
---|
| 593 | ppp_info("%s terminated by peer", PROTO_NAME(f));
|
---|
| 594 | f->retransmits = 0;
|
---|
| 595 | f->state = PPP_FSM_STOPPING;
|
---|
| 596 | if (f->callbacks->down)
|
---|
| 597 | (*f->callbacks->down)(f); /* Inform upper layers */
|
---|
| 598 | TIMEOUT(fsm_timeout, f, pcb->settings.fsm_timeout_time);
|
---|
| 599 | break;
|
---|
| 600 | default:
|
---|
| 601 | break;
|
---|
| 602 | }
|
---|
| 603 |
|
---|
| 604 | fsm_sdata(f, TERMACK, id, NULL, 0);
|
---|
| 605 | }
|
---|
| 606 |
|
---|
| 607 |
|
---|
| 608 | /*
|
---|
| 609 | * fsm_rtermack - Receive Terminate-Ack.
|
---|
| 610 | */
|
---|
| 611 | static void fsm_rtermack(fsm *f) {
|
---|
| 612 | switch (f->state) {
|
---|
| 613 | case PPP_FSM_CLOSING:
|
---|
| 614 | UNTIMEOUT(fsm_timeout, f);
|
---|
| 615 | f->state = PPP_FSM_CLOSED;
|
---|
| 616 | if( f->callbacks->finished )
|
---|
| 617 | (*f->callbacks->finished)(f);
|
---|
| 618 | break;
|
---|
| 619 | case PPP_FSM_STOPPING:
|
---|
| 620 | UNTIMEOUT(fsm_timeout, f);
|
---|
| 621 | f->state = PPP_FSM_STOPPED;
|
---|
| 622 | if( f->callbacks->finished )
|
---|
| 623 | (*f->callbacks->finished)(f);
|
---|
| 624 | break;
|
---|
| 625 |
|
---|
| 626 | case PPP_FSM_ACKRCVD:
|
---|
| 627 | f->state = PPP_FSM_REQSENT;
|
---|
| 628 | break;
|
---|
| 629 |
|
---|
| 630 | case PPP_FSM_OPENED:
|
---|
| 631 | if (f->callbacks->down)
|
---|
| 632 | (*f->callbacks->down)(f); /* Inform upper layers */
|
---|
| 633 | fsm_sconfreq(f, 0);
|
---|
| 634 | f->state = PPP_FSM_REQSENT;
|
---|
| 635 | break;
|
---|
| 636 | default:
|
---|
| 637 | break;
|
---|
| 638 | }
|
---|
| 639 | }
|
---|
| 640 |
|
---|
| 641 |
|
---|
| 642 | /*
|
---|
| 643 | * fsm_rcoderej - Receive an Code-Reject.
|
---|
| 644 | */
|
---|
| 645 | static void fsm_rcoderej(fsm *f, u_char *inp, int len) {
|
---|
| 646 | u_char code, id;
|
---|
| 647 |
|
---|
| 648 | if (len < HEADERLEN) {
|
---|
| 649 | FSMDEBUG(("fsm_rcoderej: Rcvd short Code-Reject packet!"));
|
---|
| 650 | return;
|
---|
| 651 | }
|
---|
| 652 | GETCHAR(code, inp);
|
---|
| 653 | GETCHAR(id, inp);
|
---|
| 654 | ppp_warn("%s: Rcvd Code-Reject for code %d, id %d", PROTO_NAME(f), code, id);
|
---|
| 655 |
|
---|
| 656 | if( f->state == PPP_FSM_ACKRCVD )
|
---|
| 657 | f->state = PPP_FSM_REQSENT;
|
---|
| 658 | }
|
---|
| 659 |
|
---|
| 660 |
|
---|
| 661 | /*
|
---|
| 662 | * fsm_protreject - Peer doesn't speak this protocol.
|
---|
| 663 | *
|
---|
| 664 | * Treat this as a catastrophic error (RXJ-).
|
---|
| 665 | */
|
---|
| 666 | void fsm_protreject(fsm *f) {
|
---|
| 667 | switch( f->state ){
|
---|
| 668 | case PPP_FSM_CLOSING:
|
---|
| 669 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
|
---|
| 670 | /* fall through */
|
---|
| 671 | /* no break */
|
---|
| 672 | case PPP_FSM_CLOSED:
|
---|
| 673 | f->state = PPP_FSM_CLOSED;
|
---|
| 674 | if( f->callbacks->finished )
|
---|
| 675 | (*f->callbacks->finished)(f);
|
---|
| 676 | break;
|
---|
| 677 |
|
---|
| 678 | case PPP_FSM_STOPPING:
|
---|
| 679 | case PPP_FSM_REQSENT:
|
---|
| 680 | case PPP_FSM_ACKRCVD:
|
---|
| 681 | case PPP_FSM_ACKSENT:
|
---|
| 682 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
|
---|
| 683 | /* fall through */
|
---|
| 684 | /* no break */
|
---|
| 685 | case PPP_FSM_STOPPED:
|
---|
| 686 | f->state = PPP_FSM_STOPPED;
|
---|
| 687 | if( f->callbacks->finished )
|
---|
| 688 | (*f->callbacks->finished)(f);
|
---|
| 689 | break;
|
---|
| 690 |
|
---|
| 691 | case PPP_FSM_OPENED:
|
---|
| 692 | terminate_layer(f, PPP_FSM_STOPPING);
|
---|
| 693 | break;
|
---|
| 694 |
|
---|
| 695 | default:
|
---|
| 696 | FSMDEBUG(("%s: Protocol-reject event in state %d!",
|
---|
| 697 | PROTO_NAME(f), f->state));
|
---|
| 698 | /* no break */
|
---|
| 699 | }
|
---|
| 700 | }
|
---|
| 701 |
|
---|
| 702 |
|
---|
| 703 | /*
|
---|
| 704 | * fsm_sconfreq - Send a Configure-Request.
|
---|
| 705 | */
|
---|
| 706 | static void fsm_sconfreq(fsm *f, int retransmit) {
|
---|
| 707 | ppp_pcb *pcb = f->pcb;
|
---|
| 708 | struct pbuf *p;
|
---|
| 709 | u_char *outp;
|
---|
| 710 | int cilen;
|
---|
| 711 |
|
---|
| 712 | if( f->state != PPP_FSM_REQSENT && f->state != PPP_FSM_ACKRCVD && f->state != PPP_FSM_ACKSENT ){
|
---|
| 713 | /* Not currently negotiating - reset options */
|
---|
| 714 | if( f->callbacks->resetci )
|
---|
| 715 | (*f->callbacks->resetci)(f);
|
---|
| 716 | f->nakloops = 0;
|
---|
| 717 | f->rnakloops = 0;
|
---|
| 718 | }
|
---|
| 719 |
|
---|
| 720 | if( !retransmit ){
|
---|
| 721 | /* New request - reset retransmission counter, use new ID */
|
---|
| 722 | f->retransmits = pcb->settings.fsm_max_conf_req_transmits;
|
---|
| 723 | f->reqid = ++f->id;
|
---|
| 724 | }
|
---|
| 725 |
|
---|
| 726 | f->seen_ack = 0;
|
---|
| 727 |
|
---|
| 728 | /*
|
---|
| 729 | * Make up the request packet
|
---|
| 730 | */
|
---|
| 731 | if( f->callbacks->cilen && f->callbacks->addci ){
|
---|
| 732 | cilen = (*f->callbacks->cilen)(f);
|
---|
| 733 | if( cilen > pcb->peer_mru - HEADERLEN )
|
---|
| 734 | cilen = pcb->peer_mru - HEADERLEN;
|
---|
| 735 | } else
|
---|
| 736 | cilen = 0;
|
---|
| 737 |
|
---|
| 738 | p = pbuf_alloc(PBUF_RAW, (u16_t)(cilen + HEADERLEN + PPP_HDRLEN), PPP_CTRL_PBUF_TYPE);
|
---|
| 739 | if(NULL == p)
|
---|
| 740 | return;
|
---|
| 741 | if(p->tot_len != p->len) {
|
---|
| 742 | pbuf_free(p);
|
---|
| 743 | return;
|
---|
| 744 | }
|
---|
| 745 |
|
---|
| 746 | /* send the request to our peer */
|
---|
| 747 | outp = (u_char*)p->payload;
|
---|
| 748 | MAKEHEADER(outp, f->protocol);
|
---|
| 749 | PUTCHAR(CONFREQ, outp);
|
---|
| 750 | PUTCHAR(f->reqid, outp);
|
---|
| 751 | PUTSHORT(cilen + HEADERLEN, outp);
|
---|
| 752 | if (cilen != 0) {
|
---|
| 753 | (*f->callbacks->addci)(f, outp, &cilen);
|
---|
| 754 | LWIP_ASSERT("cilen == p->len - HEADERLEN - PPP_HDRLEN", cilen == p->len - HEADERLEN - PPP_HDRLEN);
|
---|
| 755 | }
|
---|
| 756 |
|
---|
| 757 | ppp_write(pcb, p);
|
---|
| 758 |
|
---|
| 759 | /* start the retransmit timer */
|
---|
| 760 | --f->retransmits;
|
---|
| 761 | TIMEOUT(fsm_timeout, f, pcb->settings.fsm_timeout_time);
|
---|
| 762 | }
|
---|
| 763 |
|
---|
| 764 |
|
---|
| 765 | /*
|
---|
| 766 | * fsm_sdata - Send some data.
|
---|
| 767 | *
|
---|
| 768 | * Used for all packets sent to our peer by this module.
|
---|
| 769 | */
|
---|
| 770 | void fsm_sdata(fsm *f, u_char code, u_char id, const u_char *data, int datalen) {
|
---|
| 771 | ppp_pcb *pcb = f->pcb;
|
---|
| 772 | struct pbuf *p;
|
---|
| 773 | u_char *outp;
|
---|
| 774 | int outlen;
|
---|
| 775 |
|
---|
| 776 | /* Adjust length to be smaller than MTU */
|
---|
| 777 | if (datalen > pcb->peer_mru - HEADERLEN)
|
---|
| 778 | datalen = pcb->peer_mru - HEADERLEN;
|
---|
| 779 | outlen = datalen + HEADERLEN;
|
---|
| 780 |
|
---|
| 781 | p = pbuf_alloc(PBUF_RAW, (u16_t)(outlen + PPP_HDRLEN), PPP_CTRL_PBUF_TYPE);
|
---|
| 782 | if(NULL == p)
|
---|
| 783 | return;
|
---|
| 784 | if(p->tot_len != p->len) {
|
---|
| 785 | pbuf_free(p);
|
---|
| 786 | return;
|
---|
| 787 | }
|
---|
| 788 |
|
---|
| 789 | outp = (u_char*)p->payload;
|
---|
| 790 | if (datalen) /* && data != outp + PPP_HDRLEN + HEADERLEN) -- was only for fsm_sconfreq() */
|
---|
| 791 | MEMCPY(outp + PPP_HDRLEN + HEADERLEN, data, datalen);
|
---|
| 792 | MAKEHEADER(outp, f->protocol);
|
---|
| 793 | PUTCHAR(code, outp);
|
---|
| 794 | PUTCHAR(id, outp);
|
---|
| 795 | PUTSHORT(outlen, outp);
|
---|
| 796 | ppp_write(pcb, p);
|
---|
| 797 | }
|
---|
| 798 |
|
---|
| 799 | #endif /* PPP_SUPPORT */
|
---|