print-ip6.c revision 57278
1/* 2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that: (1) source code distributions 7 * retain the above copyright notice and this paragraph in its entirety, (2) 8 * distributions including binary code include the above copyright notice and 9 * this paragraph in its entirety in the documentation or other materials 10 * provided with the distribution, and (3) all advertising materials mentioning 11 * features or use of this software display the following acknowledgement: 12 * ``This product includes software developed by the University of California, 13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 14 * the University nor the names of its contributors may be used to endorse 15 * or promote products derived from this software without specific prior 16 * written permission. 17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 20 * 21 * $FreeBSD: head/contrib/tcpdump/print-ip6.c 57278 2000-02-17 03:30:04Z fenner $ 22 */ 23 24#ifndef lint 25static const char rcsid[] = 26 "@(#) $Header: /tcpdump/master/tcpdump/print-ip6.c,v 1.2.2.1 2000/01/11 06:58:25 fenner Exp $"; 27#endif 28 29#ifdef HAVE_CONFIG_H 30#include "config.h" 31#endif 32 33#ifdef INET6 34 35#include <sys/param.h> 36#include <sys/time.h> 37#include <sys/types.h> 38#include <sys/socket.h> 39 40#include <netinet/in.h> 41#include <netinet/in_systm.h> 42#include <netinet/ip.h> 43#include <netinet/ip_var.h> 44#include <netinet/udp.h> 45#include <netinet/udp_var.h> 46#include <netinet/tcp.h> 47 48#include <stdio.h> 49#ifdef __STDC__ 50#include <stdlib.h> 51#endif 52#include <unistd.h> 53 54#include "interface.h" 55#include "addrtoname.h" 56 57#include <netinet/ip6.h> 58 59/* 60 * print an IP6 datagram. 61 */ 62void 63ip6_print(register const u_char *bp, register int length) 64{ 65 register const struct ip6_hdr *ip6; 66 register int hlen; 67 register int len; 68 register const u_char *cp; 69 int nh; 70 u_int flow; 71 72 ip6 = (const struct ip6_hdr *)bp; 73 74#ifdef TCPDUMP_ALIGN 75 /* 76 * The IP header is not word aligned, so copy into abuf. 77 * This will never happen with BPF. It does happen raw packet 78 * dumps from -r. 79 */ 80 if ((int)ip & (sizeof(long)-1)) { 81 static u_char *abuf; 82 83 if (abuf == 0) 84 abuf = (u_char *)malloc(snaplen); 85 bcopy((char *)ip, (char *)abuf, min(length, snaplen)); 86 snapend += abuf - (u_char *)ip; 87 packetp = abuf; 88 ip = (struct ip6_hdr *)abuf; 89 } 90#endif 91 if ((u_char *)(ip6 + 1) > snapend) { 92 printf("[|ip6]"); 93 return; 94 } 95 if (length < sizeof (struct ip6_hdr)) { 96 (void)printf("truncated-ip6 %d", length); 97 return; 98 } 99 hlen = sizeof(struct ip6_hdr); 100 101 len = ntohs(ip6->ip6_plen); 102 if (length < len + hlen) 103 (void)printf("truncated-ip6 - %d bytes missing!", 104 len + hlen - length); 105 106 cp = (const u_char *)ip6; 107 nh = ip6->ip6_nxt; 108 while (cp < snapend) { 109 cp += hlen; 110 111 if (cp == (u_char *)(ip6 + 1) 112 && nh != IPPROTO_TCP && nh != IPPROTO_UDP) { 113 (void)printf("%s > %s: ", ip6addr_string(&ip6->ip6_src), 114 ip6addr_string(&ip6->ip6_dst)); 115 } 116 117 switch (nh) { 118 case IPPROTO_HOPOPTS: 119 hlen = hbhopt_print(cp); 120 nh = *cp; 121 break; 122 case IPPROTO_DSTOPTS: 123 hlen = dstopt_print(cp); 124 nh = *cp; 125 break; 126 case IPPROTO_FRAGMENT: 127 hlen = frag6_print(cp, (const u_char *)ip6); 128 if (snapend <= cp + hlen) 129 goto end; 130 nh = *cp; 131 break; 132 case IPPROTO_ROUTING: 133 hlen = rt6_print(cp, (const u_char *)ip6); 134 nh = *cp; 135 break; 136 case IPPROTO_TCP: 137 tcp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp), 138 (const u_char *)ip6); 139 goto end; 140 case IPPROTO_UDP: 141 udp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp), 142 (const u_char *)ip6); 143 goto end; 144 case IPPROTO_ICMPV6: 145 icmp6_print(cp, (const u_char *)ip6); 146 goto end; 147 case IPPROTO_AH: 148 hlen = ah_print(cp, (const u_char *)ip6); 149 nh = *cp; 150 break; 151 case IPPROTO_ESP: 152 { 153 int enh; 154 cp += esp_print(cp, (const u_char *)ip6, &enh); 155 if (enh < 0) 156 goto end; 157 nh = enh & 0xff; 158 break; 159 } 160#ifndef IPPROTO_IPCOMP 161#define IPPROTO_IPCOMP 108 162#endif 163 case IPPROTO_IPCOMP: 164 { 165 int enh; 166 cp += ipcomp_print(cp, (const u_char *)ip6, &enh); 167 if (enh < 0) 168 goto end; 169 nh = enh & 0xff; 170 break; 171 } 172 case IPPROTO_PIM: 173 pim_print(cp, len); 174 goto end; 175#ifndef IPPROTO_OSPF 176#define IPPROTO_OSPF 89 177#endif 178 case IPPROTO_OSPF: 179 ospf6_print(cp, len); 180 goto end; 181 case IPPROTO_IPV6: 182 ip6_print(cp, len); 183 goto end; 184#ifndef IPPROTO_IPV4 185#define IPPROTO_IPV4 4 186#endif 187 case IPPROTO_IPV4: 188 ip_print(cp, len); 189 goto end; 190 case IPPROTO_NONE: 191 (void)printf("no next header"); 192 goto end; 193 194 default: 195 (void)printf("ip-proto-%d %d", ip6->ip6_nxt, len); 196 goto end; 197 } 198 } 199 200 end: 201 202 flow = ntohl(ip6->ip6_flow); 203#if 0 204 /* rfc1883 */ 205 if (flow & 0x0f000000) 206 (void)printf(" [pri 0x%x]", (flow & 0x0f000000) >> 24); 207 if (flow & 0x00ffffff) 208 (void)printf(" [flowlabel 0x%x]", flow & 0x00ffffff); 209#else 210 /* RFC 2460 */ 211 if (flow & 0x0ff00000) 212 (void)printf(" [class 0x%x]", (flow & 0x0ff00000) >> 20); 213 if (flow & 0x000fffff) 214 (void)printf(" [flowlabel 0x%x]", flow & 0x000fffff); 215#endif 216 217 if (ip6->ip6_hlim <= 1) 218 (void)printf(" [hlim %d]", (int)ip6->ip6_hlim); 219 220 if (vflag) { 221 printf(" ("); 222 (void)printf("len %d", len); 223 if (ip6->ip6_hlim > 1) 224 (void)printf(", hlim %d", (int)ip6->ip6_hlim); 225 printf(")"); 226 } 227} 228 229#endif /* INET6 */ 230