/* * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that: (1) source code distributions * retain the above copyright notice and this paragraph in its entirety, (2) * distributions including binary code include the above copyright notice and * this paragraph in its entirety in the documentation or other materials * provided with the distribution, and (3) all advertising materials mentioning * features or use of this software display the following acknowledgement: * ``This product includes software developed by the University of California, * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of * the University nor the names of its contributors may be used to endorse * or promote products derived from this software without specific prior * written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ #ifndef lint static const char rcsid[] _U_ = "@(#) $Header: /tcpdump/master/tcpdump/print-ip6.c,v 1.52 2007-09-21 07:05:33 hannes Exp $"; #endif #ifdef HAVE_CONFIG_H #include "config.h" #endif #ifdef INET6 #include #include #include #include #include "netdissect.h" #include "interface.h" #include "addrtoname.h" #include "extract.h" #include "ip6.h" #include "ipproto.h" /* * Compute a V6-style checksum by building a pseudoheader. */ int nextproto6_cksum(const struct ip6_hdr *ip6, const u_int8_t *data, u_int len, u_int next_proto) { struct { struct in6_addr ph_src; struct in6_addr ph_dst; u_int32_t ph_len; u_int8_t ph_zero[3]; u_int8_t ph_nxt; } ph; struct cksum_vec vec[2]; /* pseudo-header */ memset(&ph, 0, sizeof(ph)); UNALIGNED_MEMCPY(&ph.ph_src, &ip6->ip6_src, sizeof (struct in6_addr)); UNALIGNED_MEMCPY(&ph.ph_dst, &ip6->ip6_dst, sizeof (struct in6_addr)); ph.ph_len = htonl(len); ph.ph_nxt = next_proto; vec[0].ptr = (const u_int8_t *)(void *)&ph; vec[0].len = sizeof(ph); vec[1].ptr = data; vec[1].len = len; return in_cksum(vec, 2); } /* * print an IP6 datagram. */ void ip6_print(netdissect_options *ndo, const u_char *bp, u_int length) { register const struct ip6_hdr *ip6; register int advance; u_int len; const u_char *ipend; register const u_char *cp; register u_int payload_len; int nh; int fragmented = 0; u_int flow; ip6 = (const struct ip6_hdr *)bp; TCHECK(*ip6); if (length < sizeof (struct ip6_hdr)) { (void)ND_PRINT((ndo, "truncated-ip6 %u", length)); return; } if (!ndo->ndo_eflag) ND_PRINT((ndo, "IP6 ")); payload_len = EXTRACT_16BITS(&ip6->ip6_plen); len = payload_len + sizeof(struct ip6_hdr); if (length < len) (void)ND_PRINT((ndo, "truncated-ip6 - %u bytes missing!", len - length)); if (ndo->ndo_vflag) { flow = EXTRACT_32BITS(&ip6->ip6_flow); ND_PRINT((ndo, "(")); #if 0 /* rfc1883 */ if (flow & 0x0f000000) (void)ND_PRINT((ndo, "pri 0x%02x, ", (flow & 0x0f000000) >> 24)); if (flow & 0x00ffffff) (void)ND_PRINT((ndo, "flowlabel 0x%06x, ", flow & 0x00ffffff)); #else /* RFC 2460 */ if (flow & 0x0ff00000) (void)ND_PRINT((ndo, "class 0x%02x, ", (flow & 0x0ff00000) >> 20)); if (flow & 0x000fffff) (void)ND_PRINT((ndo, "flowlabel 0x%05x, ", flow & 0x000fffff)); #endif (void)ND_PRINT((ndo, "hlim %u, next-header %s (%u) payload length: %u) ", ip6->ip6_hlim, tok2str(ipproto_values,"unknown",ip6->ip6_nxt), ip6->ip6_nxt, payload_len)); } /* * Cut off the snapshot length to the end of the IP payload. */ ipend = bp + len; if (ipend < ndo->ndo_snapend) ndo->ndo_snapend = ipend; cp = (const u_char *)ip6; advance = sizeof(struct ip6_hdr); nh = ip6->ip6_nxt; while (cp < ndo->ndo_snapend && advance > 0) { cp += advance; len -= advance; if (cp == (const u_char *)(ip6 + 1) && nh != IPPROTO_TCP && nh != IPPROTO_UDP && nh != IPPROTO_DCCP && nh != IPPROTO_SCTP) { (void)ND_PRINT((ndo, "%s > %s: ", ip6addr_string(&ip6->ip6_src), ip6addr_string(&ip6->ip6_dst))); } switch (nh) { case IPPROTO_HOPOPTS: advance = hbhopt_print(cp); nh = *cp; break; case IPPROTO_DSTOPTS: advance = dstopt_print(cp); nh = *cp; break; case IPPROTO_FRAGMENT: advance = frag6_print(cp, (const u_char *)ip6); if (ndo->ndo_snapend <= cp + advance) return; nh = *cp; fragmented = 1; break; case IPPROTO_MOBILITY_OLD: case IPPROTO_MOBILITY: /* * XXX - we don't use "advance"; the current * "Mobility Support in IPv6" draft * (draft-ietf-mobileip-ipv6-24) says that * the next header field in a mobility header * should be IPPROTO_NONE, but speaks of * the possiblity of a future extension in * which payload can be piggybacked atop a * mobility header. */ advance = mobility_print(cp, (const u_char *)ip6); nh = *cp; return; case IPPROTO_ROUTING: advance = rt6_print(cp, (const u_char *)ip6); nh = *cp; break; case IPPROTO_SCTP: sctp_print(cp, (const u_char *)ip6, len); return; case IPPROTO_DCCP: dccp_print(cp, (const u_char *)ip6, len); return; case IPPROTO_TCP: tcp_print(cp, len, (const u_char *)ip6, fragmented); return; case IPPROTO_UDP: udp_print(cp, len, (const u_char *)ip6, fragmented); return; case IPPROTO_ICMPV6: icmp6_print(ndo, cp, len, (const u_char *)ip6, fragmented); return; case IPPROTO_AH: advance = ah_print(cp); nh = *cp; break; case IPPROTO_ESP: { int enh, padlen; advance = esp_print(ndo, cp, len, (const u_char *)ip6, &enh, &padlen); nh = enh & 0xff; len -= padlen; break; } case IPPROTO_IPCOMP: { int enh; advance = ipcomp_print(cp, &enh); nh = enh & 0xff; break; } case IPPROTO_PIM: pim_print(cp, len, nextproto6_cksum(ip6, cp, len, IPPROTO_PIM)); return; case IPPROTO_OSPF: ospf6_print(cp, len); return; case IPPROTO_IPV6: ip6_print(ndo, cp, len); return; case IPPROTO_IPV4: ip_print(ndo, cp, len); return; case IPPROTO_PGM: pgm_print(cp, len, (const u_char *)ip6); return; case IPPROTO_GRE: gre_print(cp, len); return; case IPPROTO_RSVP: rsvp_print(cp, len); return; case IPPROTO_NONE: (void)ND_PRINT((ndo, "no next header")); return; default: (void)ND_PRINT((ndo, "ip-proto-%d %d", nh, len)); return; } } return; trunc: (void)ND_PRINT((ndo, "[|ip6]")); } #endif /* INET6 */