1 /* $OpenBSD: print-ip6opts.c,v 1.7 2020/01/24 22:46:37 procter Exp $ */ 2 3 /* 4 * Copyright (C) 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/time.h> 33 #include <sys/types.h> 34 #include <sys/socket.h> 35 36 #include <netinet/in.h> 37 #include <netinet/ip6.h> 38 39 #include <stdio.h> 40 41 #include "interface.h" 42 #include "addrtoname.h" 43 44 void 45 ip6_opt_print(const u_char *bp, int len) 46 { 47 int i; 48 int optlen; 49 50 for (i = 0; i < len; i += optlen) { 51 switch (bp[i]) { 52 case IP6OPT_PAD1: 53 optlen = 1; 54 break; 55 case IP6OPT_PADN: 56 if (len - i < IP6OPT_MINLEN) { 57 printf("(padn: trunc)"); 58 goto trunc; 59 } 60 optlen = bp[i + 1] + 2; 61 break; 62 case IP6OPT_ROUTER_ALERT: 63 if (len - i < IP6OPT_RTALERT_LEN) { 64 printf("(rtalert: trunc)"); 65 goto trunc; 66 } 67 if (bp[i + 1] != IP6OPT_RTALERT_LEN - 2) { 68 printf("(rtalert: invalid len %d)", bp[i + 1]); 69 goto trunc; 70 } 71 printf("(rtalert: 0x%04x) ", ntohs(*(u_short *)&bp[i + 2])); 72 optlen = IP6OPT_RTALERT_LEN; 73 break; 74 case IP6OPT_JUMBO: 75 if (len - i < IP6OPT_JUMBO_LEN) { 76 printf("(jumbo: trunc)"); 77 goto trunc; 78 } 79 if (bp[i + 1] != IP6OPT_JUMBO_LEN - 2) { 80 printf("(jumbo: invalid len %d)", bp[i + 1]); 81 goto trunc; 82 } 83 printf("(jumbo: %u) ", (u_int32_t)ntohl(*(u_int *)&bp[i + 2])); 84 optlen = IP6OPT_JUMBO_LEN; 85 break; 86 default: 87 if (len - i < IP6OPT_MINLEN) { 88 printf("(type %d: trunc)", bp[i]); 89 goto trunc; 90 } 91 printf("(type 0x%02x: len=%d) ", bp[i], bp[i + 1]); 92 optlen = bp[i + 1] + 2; 93 break; 94 } 95 } 96 97 #if 0 98 end: 99 #endif 100 return; 101 102 trunc: 103 printf("[trunc] "); 104 } 105 106 int 107 hbhopt_print(const u_char *bp) 108 { 109 const struct ip6_hbh *dp = (struct ip6_hbh *)bp; 110 const u_char *ep; 111 int hbhlen = 0; 112 113 /* 'ep' points to the end of avaible data. */ 114 ep = snapend; 115 TCHECK(dp->ip6h_len); 116 hbhlen = (int)((dp->ip6h_len + 1) << 3); 117 TCHECK2(*dp, hbhlen); 118 printf("HBH "); 119 if (vflag) 120 ip6_opt_print((const u_char *)dp + sizeof(*dp), hbhlen - sizeof(*dp)); 121 122 return(hbhlen); 123 124 trunc: 125 printf("[|HBH]"); 126 return(hbhlen); 127 } 128 129 int 130 dstopt_print(const u_char *bp) 131 { 132 const struct ip6_dest *dp = (struct ip6_dest *)bp; 133 const u_char *ep; 134 int dstoptlen = 0; 135 136 /* 'ep' points to the end of avaible data. */ 137 ep = snapend; 138 TCHECK(dp->ip6d_len); 139 dstoptlen = (int)((dp->ip6d_len + 1) << 3); 140 TCHECK2(*dp, dstoptlen); 141 printf("DSTOPT "); 142 if (vflag) { 143 ip6_opt_print((const u_char *)dp + sizeof(*dp), 144 dstoptlen - sizeof(*dp)); 145 } 146 147 return(dstoptlen); 148 149 trunc: 150 printf("[|DSTOPT]"); 151 return(dstoptlen); 152 } 153