| 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: ip_output.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 | * Copyright (c) 1982, 1986, 1988, 1990, 1993
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| 48 | * The Regents of the University of California. All rights reserved.
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| 49 | *
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| 50 | * Redistribution and use in source and binary forms, with or without
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| 51 | * modification, are permitted provided that the following conditions
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| 52 | * are met:
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| 53 | * 1. Redistributions of source code must retain the above copyright
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| 54 | * notice, this list of conditions and the following disclaimer.
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| 55 | * 2. Redistributions in binary form must reproduce the above copyright
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| 56 | * notice, this list of conditions and the following disclaimer in the
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| 57 | * documentation and/or other materials provided with the distribution.
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| 58 | * 3. All advertising materials mentioning features or use of this software
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| 59 | * must display the following acknowledgement:
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| 60 | * This product includes software developed by the University of
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| 61 | * California, Berkeley and its contributors.
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| 62 | * 4. Neither the name of the University nor the names of its contributors
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| 63 | * may be used to endorse or promote products derived from this software
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| 64 | * without specific prior written permission.
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| 65 | *
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| 66 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 67 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 68 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 69 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 70 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 71 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 72 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 73 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 74 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 75 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 76 | * SUCH DAMAGE.
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| 77 | *
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| 78 | * @(#)output.c 8.3 (Berkeley) 1/21/94
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| 79 | * $FreeBSD: src/sys/netinet/output.c,v 1.85.2.4 1999/08/29 16:29:49 peter Exp $
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| 80 | */
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| 81 |
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| 82 | #include <string.h>
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| 83 |
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| 84 | #ifdef TARGET_KERNEL_ASP
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| 85 |
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| 86 | #include <kernel.h>
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| 87 | #include <sil.h>
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| 88 |
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| 89 | #endif /* of #ifdef TARGET_KERNEL_ASP */
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| 90 |
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| 91 | #ifdef TARGET_KERNEL_JSP
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| 92 |
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| 93 | #include <s_services.h>
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| 94 | #include <t_services.h>
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| 95 |
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| 96 | #endif /* of #ifdef TARGET_KERNEL_JSP */
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| 97 |
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| 98 | #include <tinet_defs.h>
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| 99 | #include <tinet_config.h>
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| 100 |
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| 101 | #include <net/if.h>
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| 102 | #include <net/if_loop.h>
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| 103 | #include <net/if_ppp.h>
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| 104 | #include <net/ethernet.h>
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| 105 | #include <net/ppp.h>
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| 106 | #include <net/net.h>
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| 107 | #include <net/net_endian.h>
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| 108 | #include <net/net_buf.h>
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| 109 | #include <net/net_count.h>
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| 110 |
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| 111 | #include <netinet/in.h>
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| 112 | #include <netinet/in_var.h>
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| 113 | #include <netinet/ip.h>
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| 114 | #include <netinet/ip_var.h>
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| 115 |
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| 116 | #if defined(SUPPORT_IPSEC)
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| 117 | #include <netinet6/ipsec.h>
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| 118 | #endif
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| 119 |
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| 120 | #if defined(_IP4_CFG)
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| 121 |
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| 122 | static uint16_t frag_id = 0;
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| 123 |
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| 124 | /*
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| 125 | * IP output -- IP ã®åºåé¢æ°
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| 126 | *
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| 127 | * 注æ: ãã¼ã¸ã§ã³ã¨ãããé·ã¯ä¸ä½å±¤ã§è¨å®ããã
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| 128 | */
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| 129 |
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| 130 | ER
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| 131 | ip_output (T_NET_BUF *output, TMO tmout)
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| 132 | {
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| 133 | T_IP4_HDR *ip4h;
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| 134 | ER error = E_OK;
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| 135 | T_IN4_ADDR gw;
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| 136 |
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| 137 | #ifdef SUPPORT_IPSEC
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| 138 | T_SECPOLICY* sp;
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| 139 | int ipsec_error;
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| 140 | int policy;
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| 141 | #endif /* SUPPORT_IPSEC */
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| 142 |
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| 143 | NET_COUNT_MIB(ip_stats.ipOutRequests, 1);
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| 144 |
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| 145 | #ifdef SUPPORT_IPSEC
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| 146 | /* XXX: IPsecã®å¦çã¯ãã±ããæçåã®åã«è¡ããã */
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| 147 |
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| 148 | /* SPDãåå¾ãã */
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| 149 | sp = ipsec4_getpolicybyaddr(output, IPSEC_DIR_OUTBOUND, &ipsec_error);
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| 150 | if (sp==NULL) {
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| 151 | error = ipsec_error;
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| 152 | return error;
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| 153 | }
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| 154 |
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| 155 | /* ããªã·ããã§ãã¯ãã*/
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| 156 | #if 0
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| 157 | switch (sp->policy) {
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| 158 |
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| 159 | case IPSEC_POLICY_BYPASS:
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| 160 | case IPSEC_POLICY_NONE:
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| 161 | case IPSEC_POLICY_TCP:
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| 162 | goto skip_ipsec;
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| 163 |
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| 164 | break; /* NOTREACHED */
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| 165 |
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| 166 | case IPSEC_POLICY_IPSEC:
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| 167 | /* XXX: SH2ã§ã¯ããã§illegal Instructionãçºçãããã³ã³ãã¤ã©ã®ãã°? */
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| 168 | if (sp->req == NULL) {
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| 169 | /* éµäº¤æãã¼ã¢ã³ã«å¯¾ãã¦SAã®åå¾ãè¦æ±ãã */
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| 170 | goto bad;
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| 171 | }
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| 172 | break;
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| 173 |
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| 174 | default:
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| 175 | /* ä¸æ£ãªããªã· */
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| 176 | goto bad;
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| 177 | break;
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| 178 | }
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| 179 | #else /* 0 */
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| 180 | /* XXX: ã³ã³ãã¤ã©ã®ä¸å
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| 181 | ·ååé¿ã®ãã switchãããifæã§æ¸ãç´ãã */
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| 182 | policy = sp->spinitb->policy;
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| 183 |
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| 184 | if (policy == IPSEC_POLICY_BYPASS ||
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| 185 | policy == IPSEC_POLICY_NONE ||
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| 186 | policy == IPSEC_POLICY_TCP)
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| 187 | goto skip_ipsec;
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| 188 | else if (policy == IPSEC_POLICY_IPSEC) {
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| 189 | if (sp->req == NULL)
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| 190 | /* éµäº¤æãã¼ã¢ã³ã«å¯¾ãã¦SAã®åå¾ãè¦æ±ãã */
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| 191 | goto bad;
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| 192 | } else
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| 193 | goto bad;
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| 194 |
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| 195 | #endif /* 0 */
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| 196 |
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| 197 | {
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| 198 | T_IPSEC_OUTPUT_STATE state;
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| 199 |
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| 200 | state.m = output;
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| 201 | /* XXX: ipsec4_output()å
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| 202 | ã§ã¯ãip->{len,off}ããããã¯ã¼ã¯ãã¤ããªã¼ãã¨ãã */
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| 203 | error = ipsec4_output (&state, sp, 0 /* flags */ );
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| 204 | output = state.m;
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| 205 |
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| 206 | if (error) {
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| 207 | /* net_buf ã¯ipsec4_outputã«ãã£ã¦æ¢ã«è§£æ¾ããã¦ãã */
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| 208 | switch (error) {
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| 209 | default:
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| 210 | syslog (LOG_NOTICE, "ip_output:%d error", __LINE__);
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| 211 | }
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| 212 | }
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| 213 | }
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| 214 |
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| 215 | /* ipsec4_outputã«å½±é¿ãåããå¤ãæ´æ°ãã */
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| 216 | /* XXX: å¿
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| 217 | è¦ã? */
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| 218 |
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| 219 | skip_ipsec:
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| 220 | #endif /* SUPPORT_IPSEC */
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| 221 |
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| 222 | #ifdef IP4_CFG_FRAGMENT
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| 223 |
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| 224 | ip4h = GET_IP4_HDR(output);
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| 225 |
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| 226 | gw = in4_rtalloc(ntohl(ip4h->dst));
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| 227 |
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| 228 | /*
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| 229 | * ãã¼ã¿ã°ã©ã ãµã¤ãºããããã¯ã¼ã¯ã® MTU ãè¶
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| 230 | ãã¦ããã°ã
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| 231 | * åå²ãã¦éä¿¡ããã
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| 232 | */
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| 233 | if (ntohs(ip4h->len) > IF_MTU) {
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| 234 | T_NET_BUF *frag;
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| 235 | T_IP4_HDR *fip4h;
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| 236 | uint_t off, hlen, len, flen, align;
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| 237 |
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| 238 | NET_COUNT_IP4(net_count_ip4[NC_IP4_FRAG_OUT], 1);
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| 239 | NET_COUNT_MIB(ip_stats.ipFragCreates, 1);
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| 240 |
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| 241 | len = ntohs(ip4h->len);
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| 242 | off = hlen = GET_IP4_HDR_SIZE(output);
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| 243 | while (off < len) {
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| 244 | if (off + (IF_MTU - IP4_HDR_SIZE) < len)
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| 245 | flen = IF_MTU - IP4_HDR_SIZE;
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| 246 | else
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| 247 | flen = len - off;
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| 248 |
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| 249 | /* ãã¼ã¿é·ã¯ 4 ãªã¯ãããå¢çã«èª¿æ´ããã */
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| 250 | align = (flen + 3) >> 2 << 2;
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| 251 |
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| 252 | /* ãããã¯ã¼ã¯ãããã¡ãç²å¾ããã*/
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| 253 | if (tget_net_buf(&frag, align + IF_IP4_HDR_SIZE, TMO_IP4_FRAG_GET_NET_BUF) == E_OK) {
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| 254 |
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| 255 | /* ãã©ã°ã¡ã³ããã³ãã¼ããã*/
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| 256 | memcpy(GET_IP4_SDU(frag), (uint8_t *)ip4h + off, flen);
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| 257 |
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| 258 | /* ããããåããã*/
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| 259 | fip4h = GET_IP4_HDR(frag);
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| 260 | *fip4h = *ip4h;
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| 261 | fip4h->flg_off = htons(IP4_MAKE_FLGOFF(off + flen == len ? 0 : IP4_MF,
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| 262 | (off - hlen) >> 3));
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| 263 | fip4h->len = htons(flen + IP4_HDR_SIZE);
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| 264 | fip4h->id = htons(frag_id);
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| 265 | fip4h->sum = 0;
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| 266 | fip4h->sum = in_cksum(fip4h, GET_IP4_HDR_SIZE(frag));
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| 267 |
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| 268 | NET_COUNT_IP4(net_count_ip4[NC_IP4_OUT_OCTETS], ntohs(fip4h->len));
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| 269 | NET_COUNT_IP4(net_count_ip4[NC_IP4_OUT_PACKETS], 1);
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| 270 | NET_COUNT_IP4(net_count_ip4[NC_IP4_FRAG_OUT_FRAGS], 1);
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| 271 |
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| 272 | IF_SET_PROTO(frag, IF_PROTO_IP);
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| 273 | if ((error = IF_OUTPUT(frag, &gw, NULL, tmout)) != E_OK) {
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| 274 | syscall(rel_net_buf(output));
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| 275 | NET_COUNT_IP4(net_count_ip4[NC_IP4_OUT_ERR_PACKETS], 1);
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| 276 | NET_COUNT_MIB(ip_stats.ipFragFails, 1);
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| 277 | return error;
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| 278 | }
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| 279 | }
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| 280 | else {
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| 281 | /* ç²å¾ã§ããªããã°ãéä¿¡ããããããã*/
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| 282 | syscall(rel_net_buf(output));
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| 283 | NET_COUNT_IP4(net_count_ip4[NC_IP4_OUT_ERR_PACKETS], 1);
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| 284 | NET_COUNT_MIB(ip_stats.ipFragFails, 1);
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| 285 | return E_NOMEM;
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| 286 | }
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| 287 |
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| 288 | off += IF_MTU - IP4_HDR_SIZE;
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| 289 | }
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| 290 | syscall(rel_net_buf(output));
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| 291 | frag_id ++;
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| 292 | NET_COUNT_MIB(ip_stats.ipFragOKs, 1);
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| 293 | }
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| 294 | else {
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| 295 |
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| 296 | /* ããããåããã*/
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| 297 | ip4h->id = htons(frag_id);
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| 298 | frag_id ++;
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| 299 | ip4h->sum = 0;
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| 300 | ip4h->sum = in_cksum(ip4h, GET_IP4_HDR_SIZE(output));
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| 301 |
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| 302 | NET_COUNT_IP4(net_count_ip4[NC_IP4_OUT_OCTETS], ntohs(ip4h->len));
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| 303 | NET_COUNT_IP4(net_count_ip4[NC_IP4_OUT_PACKETS], 1);
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| 304 |
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| 305 | IF_SET_PROTO(output, IF_PROTO_IP);
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| 306 | if ((error = IF_OUTPUT(output, &gw, NULL, tmout)) != E_OK)
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| 307 | NET_COUNT_IP4(net_count_ip4[NC_IP4_OUT_ERR_PACKETS], 1);
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| 308 | }
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| 309 |
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| 310 | #else /* of #ifdef IP4_CFG_FRAGMENT */
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| 311 |
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| 312 | ip4h = GET_IP4_HDR(output);
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| 313 |
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| 314 | /* ãã¼ã¿ã°ã©ã ãµã¤ãºããããã¯ã¼ã¯ã® MTU ãè¶
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| 315 | ãã¦ããã°ã¨ã©ã¼ */
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| 316 | if (ntohs(ip4h->len) > IF_MTU)
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| 317 | return E_PAR;
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| 318 |
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| 319 | /* ããããåããã*/
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| 320 | ip4h->id = htons(frag_id);
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| 321 | frag_id ++;
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| 322 | ip4h->sum = 0;
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| 323 | ip4h->sum = in_cksum(ip4h, (uint_t)GET_IP4_HDR_SIZE(output));
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| 324 |
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| 325 | NET_COUNT_IP4(net_count_ip4[NC_IP4_OUT_OCTETS], ntohs(ip4h->len));
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| 326 | NET_COUNT_IP4(net_count_ip4[NC_IP4_OUT_PACKETS], 1);
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| 327 |
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| 328 | #ifdef ETHER_CFG_MULTICAST
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| 329 | /* ãã«ããã£ã¹ãã¢ãã¬ã¹ã®å ´åã¯IPã¢ãã¬ã¹ã¯ãã®ã¾ã¾ */
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| 330 | gw = ntohl(ip4h->dst);
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| 331 | if(!IN4_IS_ADDR_MULTICAST(gw))
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| 332 | gw = in4_rtalloc(gw);
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| 333 | #else
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| 334 | gw = in4_rtalloc(ntohl(ip4h->dst));
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| 335 | #endif
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| 336 | IF_SET_PROTO(output, IF_PROTO_IP);
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| 337 | if ((error = IF_OUTPUT(output, &gw, NULL, tmout)) != E_OK)
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| 338 | NET_COUNT_IP4(net_count_ip4[NC_IP4_OUT_ERR_PACKETS], 1);
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| 339 | NET_COUNT_MIB(ip_stats.ipOutDiscards, 1);
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| 340 |
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|---|
| 341 | #endif /* of #ifdef IP4_CFG_FRAGMENT */
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| 342 |
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| 343 | #ifdef SUPPORT_IPSEC
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| 344 | bad:
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| 345 | #endif /* SUPPORT_IPSEC */
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| 346 |
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|---|
| 347 | return error;
|
|---|
| 348 | }
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|---|
| 349 |
|
|---|
| 350 | #endif /* of #if defined(_IP4_CFG) */
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|---|
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