The Tcpdump Group git mirrors - tcpdump/blob - print-ip6.c

   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
  22 #ifndef lint
  23 static const char rcsid[] =
  24     "@(#) $Header: /tcpdump/master/tcpdump/print-ip6.c,v 1.17 2001-08-20 17:52:40 fenner Exp $";
  25 #endif
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #ifdef INET6
  32
  33 #include <sys/param.h>
  34 #include <sys/time.h>
  35 #include <sys/types.h>
  36 #include <sys/socket.h>
  37
  38 #include <netinet/in.h>
  39
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <unistd.h>
  43 #include <string.h>
  44
  45 #include "interface.h"
  46 #include "addrtoname.h"
  47
  48 #include "ip6.h"
  49
  50 /*
  51  * print an IP6 datagram.
  52  */
  53 void
  54 ip6_print(register const u_char *bp, register int length)
  55 {
  56         register const struct ip6_hdr *ip6;
  57         register int advance;
  58         register int len;
  59         register const u_char *cp;
  60         int nh;
  61         int fragmented = 0;
  62         u_int flow;
  63
  64         ip6 = (const struct ip6_hdr *)bp;
  65
  66 #ifdef LBL_ALIGN
  67         /*
  68          * The IP6 header is not 16-byte aligned, so copy into abuf.
  69          * This will never happen with BPF.  It does happen raw packet
  70          * dumps from -r.
  71          */
  72         if ((u_long)ip6 & 15) {
  73                 static u_char *abuf;
  74
  75                 if (abuf == NULL)
  76                         abuf = malloc(snaplen);
  77                 memcpy(abuf, ip6, min(length, snaplen));
  78                 snapend += abuf - (u_char *)ip6;
  79                 packetp = abuf;
  80                 ip6 = (struct ip6_hdr *)abuf;
  81         }
  82 #endif
  83         if ((u_char *)(ip6 + 1) > snapend) {
  84                 printf("[|ip6]");
  85                 return;
  86         }
  87         if (length < sizeof (struct ip6_hdr)) {
  88                 (void)printf("truncated-ip6 %d", length);
  89                 return;
  90         }
  91         advance = sizeof(struct ip6_hdr);
  92
  93         len = ntohs(ip6->ip6_plen);
  94         if (length < len + advance)
  95                 (void)printf("truncated-ip6 - %d bytes missing!",
  96                         len + advance - length);
  97
  98         cp = (const u_char *)ip6;
  99         nh = ip6->ip6_nxt;
 100         while (cp < snapend) {
 101                 cp += advance;
 102
 103                 if (cp == (u_char *)(ip6 + 1)
 104                  && nh != IPPROTO_TCP && nh != IPPROTO_UDP) {
 105                         (void)printf("%s > %s: ", ip6addr_string(&ip6->ip6_src),
 106                                      ip6addr_string(&ip6->ip6_dst));
 107                 }
 108
 109                 switch (nh) {
 110                 case IPPROTO_HOPOPTS:
 111                         advance = hbhopt_print(cp);
 112                         nh = *cp;
 113                         break;
 114                 case IPPROTO_DSTOPTS:
 115                         advance = dstopt_print(cp);
 116                         nh = *cp;
 117                         break;
 118                 case IPPROTO_FRAGMENT:
 119                         advance = frag6_print(cp, (const u_char *)ip6);
 120                         if (snapend <= cp + advance)
 121                                 goto end;
 122                         nh = *cp;
 123                         fragmented = 1;
 124                         break;
 125                 case IPPROTO_ROUTING:
 126                         advance = rt6_print(cp, (const u_char *)ip6);
 127                         nh = *cp;
 128                         break;
 129                 case IPPROTO_TCP:
 130                         tcp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
 131                                 (const u_char *)ip6, fragmented);
 132                         goto end;
 133                 case IPPROTO_UDP:
 134                         udp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
 135                                 (const u_char *)ip6, fragmented);
 136                         goto end;
 137                 case IPPROTO_ICMPV6:
 138                         icmp6_print(cp, (const u_char *)ip6);
 139                         goto end;
 140                 case IPPROTO_AH:
 141                         advance = ah_print(cp, (const u_char *)ip6);
 142                         nh = *cp;
 143                         break;
 144                 case IPPROTO_ESP:
 145                     {
 146                         int enh, padlen;
 147                         advance = esp_print(cp, (const u_char *)ip6, &enh, &padlen);
 148                         if (enh < 0)
 149                                 goto end;
 150                         nh = enh & 0xff;
 151                         len -= padlen;
 152                         break;
 153                     }
 154 #ifndef IPPROTO_IPCOMP
 155 #define IPPROTO_IPCOMP  108
 156 #endif
 157                 case IPPROTO_IPCOMP:
 158                     {
 159                         int enh;
 160                         advance = ipcomp_print(cp, (const u_char *)ip6, &enh);
 161                         if (enh < 0)
 162                                 goto end;
 163                         nh = enh & 0xff;
 164                         break;
 165                     }
 166
 167 #ifndef IPPROTO_PIM
 168 #define IPPROTO_PIM     103
 169 #endif
 170                 case IPPROTO_PIM:
 171                         pim_print(cp, len);
 172                         goto end;
 173 #ifndef IPPROTO_OSPF
 174 #define IPPROTO_OSPF 89
 175 #endif
 176                 case IPPROTO_OSPF:
 177                         ospf6_print(cp, len);
 178                         goto end;
 179                 case IPPROTO_IPV6:
 180                         ip6_print(cp, len);
 181                         goto end;
 182 #ifndef IPPROTO_IPV4
 183 #define IPPROTO_IPV4    4
 184 #endif
 185                 case IPPROTO_IPV4:
 186                         ip_print(cp, len);
 187                         goto end;
 188                 case IPPROTO_NONE:
 189                         (void)printf("no next header");
 190                         goto end;
 191
 192                 default:
 193                         (void)printf("ip-proto-%d %d", ip6->ip6_nxt, len);
 194                         goto end;
 195                 }
 196         }
 197
 198  end:
 199
 200         flow = ntohl(ip6->ip6_flow);
 201 #if 0
 202         /* rfc1883 */
 203         if (flow & 0x0f000000)
 204                 (void)printf(" [pri 0x%x]", (flow & 0x0f000000) >> 24);
 205         if (flow & 0x00ffffff)
 206                 (void)printf(" [flowlabel 0x%x]", flow & 0x00ffffff);
 207 #else
 208         /* RFC 2460 */
 209         if (flow & 0x0ff00000)
 210                 (void)printf(" [class 0x%x]", (flow & 0x0ff00000) >> 20);
 211         if (flow & 0x000fffff)
 212                 (void)printf(" [flowlabel 0x%x]", flow & 0x000fffff);
 213 #endif
 214
 215         if (ip6->ip6_hlim <= 1)
 216                 (void)printf(" [hlim %d]", (int)ip6->ip6_hlim);
 217
 218         if (vflag) {
 219                 printf(" (");
 220                 (void)printf("len %d", len);
 221                 if (ip6->ip6_hlim > 1)
 222                         (void)printf(", hlim %d", (int)ip6->ip6_hlim);
 223                 printf(")");
 224         }
 225 }
 226
 227 #endif /* INET6 */