| 1 | /*
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| 2 | * TINET (TCP/IP Protocol Stack)
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| 3 | *
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| 4 | * Copyright (C) 2001-2017 by Dep. of Computer Science and Engineering
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| 5 | * Tomakomai National College of Technology, JAPAN
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| 6 | *
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| 7 | * ä¸è¨èä½æ¨©è
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| 8 | ã¯ï¼ä»¥ä¸ã® (1)ï½(4) ã®æ¡ä»¶ãï¼Free Software Foundation
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| 9 | * ã«ãã£ã¦å
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| 10 | ¬è¡¨ããã¦ãã GNU General Public License ã® Version 2 ã«è¨
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| 11 | * è¿°ããã¦ããæ¡ä»¶ãæºããå ´åã«éãï¼æ¬ã½ããã¦ã§ã¢ï¼æ¬ã½ããã¦ã§ã¢
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| 12 | * ãæ¹å¤ãããã®ãå«ãï¼ä»¥ä¸åãï¼ã使ç¨ã»è¤è£½ã»æ¹å¤ã»åé
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| 13 | å¸ï¼ä»¥ä¸ï¼
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| 14 | * å©ç¨ã¨å¼ã¶ï¼ãããã¨ãç¡åã§è¨±è«¾ããï¼
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| 15 | * (1) æ¬ã½ããã¦ã§ã¢ãã½ã¼ã¹ã³ã¼ãã®å½¢ã§å©ç¨ããå ´åã«ã¯ï¼ä¸è¨ã®èä½
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| 16 | * 権表示ï¼ãã®å©ç¨æ¡ä»¶ããã³ä¸è¨ã®ç¡ä¿è¨¼è¦å®ãï¼ãã®ã¾ã¾ã®å½¢ã§ã½ã¼
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| 17 | * ã¹ã³ã¼ãä¸ã«å«ã¾ãã¦ãããã¨ï¼
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| 18 | * (2) æ¬ã½ããã¦ã§ã¢ãï¼ã©ã¤ãã©ãªå½¢å¼ãªã©ï¼ä»ã®ã½ããã¦ã§ã¢éçºã«ä½¿
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| 19 | * ç¨ã§ããå½¢ã§åé
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| 20 | å¸ããå ´åã«ã¯ï¼åé
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| 21 | å¸ã«ä¼´ãããã¥ã¡ã³ãï¼å©ç¨
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| 22 | * è
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| 23 | ããã¥ã¢ã«ãªã©ï¼ã«ï¼ä¸è¨ã®èä½æ¨©è¡¨ç¤ºï¼ãã®å©ç¨æ¡ä»¶ããã³ä¸è¨
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| 24 | * ã®ç¡ä¿è¨¼è¦å®ãæ²è¼ãããã¨ï¼
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| 25 | * (3) æ¬ã½ããã¦ã§ã¢ãï¼æ©å¨ã«çµã¿è¾¼ããªã©ï¼ä»ã®ã½ããã¦ã§ã¢éçºã«ä½¿
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| 26 | * ç¨ã§ããªãå½¢ã§åé
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| 27 | å¸ããå ´åã«ã¯ï¼æ¬¡ã®æ¡ä»¶ãæºãããã¨ï¼
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| 28 | * (a) åé
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| 29 | å¸ã«ä¼´ãããã¥ã¡ã³ãï¼å©ç¨è
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| 30 | ããã¥ã¢ã«ãªã©ï¼ã«ï¼ä¸è¨ã®è
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| 31 | * ä½æ¨©è¡¨ç¤ºï¼ãã®å©ç¨æ¡ä»¶ããã³ä¸è¨ã®ç¡ä¿è¨¼è¦å®ãæ²è¼ãããã¨ï¼
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| 32 | * (4) æ¬ã½ããã¦ã§ã¢ã®å©ç¨ã«ããç´æ¥çã¾ãã¯éæ¥çã«çãããããªãæ
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| 33 | * 害ãããï¼ä¸è¨èä½æ¨©è
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| 34 | ããã³TOPPERSããã¸ã§ã¯ããå
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| 35 | 責ãããã¨ï¼
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| 36 | *
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| 37 | * æ¬ã½ããã¦ã§ã¢ã¯ï¼ç¡ä¿è¨¼ã§æä¾ããã¦ãããã®ã§ããï¼ä¸è¨èä½æ¨©è
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| 38 | ã
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| 39 | * ãã³TOPPERSããã¸ã§ã¯ãã¯ï¼æ¬ã½ããã¦ã§ã¢ã«é¢ãã¦ï¼ãã®é©ç¨å¯è½æ§ã
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| 40 | * å«ãã¦ï¼ãããªãä¿è¨¼ãè¡ããªãï¼ã¾ãï¼æ¬ã½ããã¦ã§ã¢ã®å©ç¨ã«ããç´
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| 41 | * æ¥çã¾ãã¯éæ¥çã«çãããããªãæ害ã«é¢ãã¦ãï¼ãã®è²¬ä»»ãè² ããªãï¼
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| 42 | *
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| 43 | * @(#) $Id: ppp_ccp.c 388 2019-05-22 11:25:18Z coas-nagasima $
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| 44 | */
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| 45 |
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| 46 | /*
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| 47 | * ccp.c - PPP Compression Control Protocol.
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| 48 | *
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| 49 | * Copyright (c) 1994 The Australian National University.
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| 50 | * All rights reserved.
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| 51 | *
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| 52 | * Permission to use, copy, modify, and distribute this software and its
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| 53 | * documentation is hereby granted, provided that the above copyright
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| 54 | * notice appears in all copies. This software is provided without any
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| 55 | * warranty, express or implied. The Australian National University
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| 56 | * makes no representations about the suitability of this software for
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| 57 | * any purpose.
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| 58 | *
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| 59 | * IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
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| 60 | * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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| 61 | * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
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| 62 | * THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY
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| 63 | * OF SUCH DAMAGE.
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| 64 | *
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| 65 | * THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
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| 66 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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| 67 | * AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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| 68 | * ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
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| 69 | * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
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| 70 | * OR MODIFICATIONS.
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| 71 | */
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| 72 |
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| 73 | /*
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| 74 | * PPP Compression Control Protocol (CCP) Module
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| 75 | *
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| 76 | * Written by Toshiharu OHNO (tony-o@iij.ad.jp)
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| 77 | *
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| 78 | * Copyright (C) 1994, Internet Initiative Japan, Inc. All rights reserverd.
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| 79 | *
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| 80 | * Redistribution and use in source and binary forms are permitted
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| 81 | * provided that the above copyright notice and this paragraph are
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| 82 | * duplicated in all such forms and that any documentation,
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| 83 | * advertising materials, and other materials related to such
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| 84 | * distribution and use acknowledge that the software was developed
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| 85 | * by the Internet Initiative Japan, Inc. The name of the
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| 86 | * IIJ may not be used to endorse or promote products derived
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| 87 | * from this software without specific prior written permission.
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| 88 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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| 89 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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| 90 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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| 91 | *
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| 92 | * $FreeBSD: src/usr.sbin/ppp/ccp.c,v 1.54.2.2 2000/08/19 09:29:59 brian Exp $
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| 93 | *
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| 94 | * TODO:
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| 95 | * o Support other compression protocols
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| 96 | */
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| 97 |
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| 98 | /*
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| 99 | * å®è£
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| 100 | äºå®ãç¾å¨ã¯ãã¹ã¦æå¦
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| 101 | */
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| 102 |
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| 103 | #include <t_services.h>
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| 104 |
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| 105 | #include <net/if.h>
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| 106 | #include <net/if_ppp.h>
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| 107 | #include <net/net_buf.h>
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| 108 | #include <net/net_count.h>
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| 109 | #include <net/ppp.h>
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| 110 | #include <net/ppp_var.h>
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| 111 | #include <net/ppp_fsm.h>
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| 112 | #include <net/ppp_ccp.h>
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| 113 |
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| 114 | /*
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| 115 | * é¢æ°
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| 116 | */
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| 117 |
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| 118 | static void ccp_init (void);
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| 119 | static void ccp_input (T_NET_BUF *nbuf);
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| 120 | static void ccp_protrej (void);
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| 121 | static void ccp_lowerup (void);
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| 122 | static void ccp_lowerdown (void);
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| 123 | static void ccp_open (void);
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| 124 | static void ccp_close (void);
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| 125 |
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| 126 | /*
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| 127 | * FSM ããå¼åºãããã³ã¼ã«ããã¯é¢
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| 128 | */
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| 129 |
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| 130 | static int_t ccp_reqci (T_PPP_FSM *fsm, T_NET_BUF *nbuf);
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| 131 | /* ç¸æã®æ§ææ
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| 132 | å ±ã確èªããã */
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| 133 |
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| 134 | /*
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| 135 | * å
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| 136 | ¨åå¤æ°
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| 137 | */
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| 138 |
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| 139 | T_PPP_FSM_CALLBACKS ccp_callbacks = {
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| 140 | NULL, /* èªæ§ææ
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| 141 | å ±ããªã»ããããã */
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| 142 | NULL, /* æ§ææ
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| 143 | å ±ã®é·ããè¿ãã */
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| 144 | NULL, /* èªæ§ææ
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| 145 | å ±ã追å ããã */
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| 146 | NULL, /* ACK ãåä¿¡ããã¨ãã®å¦ç */
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| 147 | NULL, /* NAK ãåä¿¡ããã¨ãã®å¦ç */
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| 148 | NULL, /* REJ ãåä¿¡ããã¨ãã®å¦ç */
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| 149 | ccp_reqci, /* ç¸æã®æ§ææ
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| 150 | å ±ã確èªããã */
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| 151 | NULL, /* ãªã³ã¯æ¥ç¶ã確ç«ããã */
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| 152 | NULL, /* ãªã³ã¯æ¥ç¶ã解æ¾ããã */
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| 153 | NULL, /* ä¸ä½å±¤ãéå§ããã */
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| 154 | NULL, /* ä¸ä½å±¤ãçµäºããã */
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| 155 | NULL, /* åéããã */
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| 156 | NULL, /* ä¸æ㪠CP ãåä¿¡ããã¨ãã®å¦ç */
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| 157 | };
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| 158 |
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| 159 | T_PPP_FSM ccp_fsm = {
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| 160 | &ccp_callbacks, /* ã³ã¼ã«ããã¯é¢æ° */
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| 161 | PPP_CCP, /* ãããã³ã« */
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| 162 | };
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| 163 |
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| 164 | T_PPP_PROTENT ccp_protent = {
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| 165 | PPP_CCP,
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| 166 | ccp_init, /* åæå */
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| 167 | ccp_input, /* å
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| 168 | ¥å */
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| 169 | ccp_protrej, /* Proto-REJ åä¿¡å¦ç */
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| 170 | ccp_lowerup, /* ä¸ä½å±¤ãèµ·åãã */
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| 171 | ccp_lowerdown, /* ä¸ä½å±¤ãåæ¢ãã */
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| 172 | ccp_open, /* ãªã¼ãã³ãã */
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| 173 | ccp_close, /* ã¯ãã¼ãºãã */
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| 174 | NULL, /* ãã¼ã¿å
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| 175 | ¥å */
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| 176 | };
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| 177 |
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| 178 | /*
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| 179 | * ccp_init -- CCP ã¢ã¸ã¥ã¼ã«ã®åæå
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| 180 | */
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| 181 |
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| 182 | static void
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| 183 | ccp_init (void)
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| 184 | {
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| 185 | fsm_init(&ccp_fsm);
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| 186 | }
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| 187 |
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| 188 | /*
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| 189 | * ccp_input -- CCP å
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| 190 | ¥å
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| 191 | */
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| 192 |
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| 193 | static void
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| 194 | ccp_input (T_NET_BUF *nbuf)
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| 195 | {
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| 196 | NET_COUNT_PPP_CCP(net_count_ppp_ccp_in_octets, nbuf->len);
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| 197 | NET_COUNT_PPP_CCP(net_count_ppp_ccp_in_packets, 1);
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| 198 | fsm_input(&ccp_fsm, nbuf);
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| 199 | }
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| 200 |
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| 201 | /*
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| 202 | * ccp_reqci -- ç¸æã®æ§ææ
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| 203 | å ±ã解æããã
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| 204 | */
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| 205 |
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| 206 | static int_t
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| 207 | ccp_reqci (T_PPP_FSM *fsm, T_NET_BUF *nbuf)
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| 208 | {
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| 209 | /*
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| 210 | * å®è£
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| 211 | äºå®ãç¾å¨ã¯ãã¹ã¦ã®ãªãã·ã§ã³ãæå¦ããã
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| 212 | */
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| 213 | return nbuf->len > (sizeof(T_PPP_HDR) + sizeof(T_PPP_CP_HDR)) ? PPP_CONFREJ : PPP_CONFACK;
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| 214 | }
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| 215 |
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| 216 | /*
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| 217 | * ccp_protrej -- Proto-REJ ãåä¿¡ããã¨ãã®å¦ç
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| 218 | */
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| 219 |
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| 220 | static void
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| 221 | ccp_protrej (void)
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| 222 | {
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| 223 | fsm_lowerdown(&ccp_fsm);
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| 224 | }
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| 225 |
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| 226 | /*
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| 227 | * ccp_lowerup -- CCP ä¸ä½å±¤ãèµ·åããã
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| 228 | */
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| 229 |
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| 230 | static void
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| 231 | ccp_lowerup (void)
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| 232 | {
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| 233 | fsm_lowerup(&ccp_fsm);
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| 234 | }
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| 235 |
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| 236 | /*
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| 237 | * ccp_lowerdown -- CCP ä¸ä½å±¤ãåæ¢ããã
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| 238 | */
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| 239 |
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| 240 | static void
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| 241 | ccp_lowerdown (void)
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| 242 | {
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| 243 | fsm_lowerdown(&ccp_fsm);
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| 244 | }
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| 245 |
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| 246 | /*
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| 247 | * ccp_open -- CCP ã®ãªã¼ã
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| 248 | */
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| 249 |
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| 250 | static void
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| 251 | ccp_open (void)
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| 252 | {
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| 253 | fsm_open(&ccp_fsm);
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| 254 | }
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| 255 |
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| 256 | /*
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| 257 | * ccp_close -- CCP ã®ã¯ãã¼ãº
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| 258 | */
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| 259 |
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| 260 | static void
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| 261 | ccp_close (void)
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| 262 | {
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| 263 | fsm_close(&ccp_fsm);
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| 264 | }
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