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/* $OpenBSD: print-ip6.c,v 1.24 2016/12/13 06:40:21 dlg Exp $ */ |
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/* |
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* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994 |
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* The Regents of the University of California. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that: (1) source code distributions |
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* retain the above copyright notice and this paragraph in its entirety, (2) |
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* distributions including binary code include the above copyright notice and |
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* this paragraph in its entirety in the documentation or other materials |
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* provided with the distribution, and (3) all advertising materials mentioning |
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* features or use of this software display the following acknowledgement: |
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* ``This product includes software developed by the University of California, |
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of |
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* the University nor the names of its contributors may be used to endorse |
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* or promote products derived from this software without specific prior |
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* written permission. |
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED |
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
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*/ |
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#ifdef INET6 |
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#include <sys/time.h> |
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <netinet/in.h> |
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#include <netinet/ip.h> |
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#include <netinet/ip_var.h> |
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#include <netinet/udp.h> |
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#include <netinet/udp_var.h> |
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#include <netinet/tcp.h> |
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#include <inttypes.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <unistd.h> |
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#include "interface.h" |
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#include "addrtoname.h" |
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#include <netinet/ip6.h> |
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/* |
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* print an IP6 datagram. |
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*/ |
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void |
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ip6_print(const u_char *bp, u_int length) |
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{ |
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const struct ip6_hdr *ip6; |
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int hlen; |
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int len; |
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const u_char *cp; |
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const u_char *pktp = packetp; |
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const u_char *send = snapend; |
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int nh; |
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u_int flow; |
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ip6 = (const struct ip6_hdr *)bp; |
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if ((u_char *)(ip6 + 1) > snapend) { |
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printf("[|ip6]"); |
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return; |
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} |
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/* |
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* The IP header is not word aligned, so copy into abuf. |
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* This will never happen with BPF. It does happen with |
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* raw packet dumps from -r. |
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*/ |
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if ((intptr_t)ip6 & (sizeof(u_int32_t)-1)) { |
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static u_char *abuf = NULL; |
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static int didwarn = 0; |
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int clen = snapend - bp; |
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if (clen > snaplen) |
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clen = snaplen; |
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if (abuf == NULL) { |
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abuf = malloc(snaplen); |
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if (abuf == NULL) |
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error("ip6_print: malloc"); |
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} |
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memmove((char *)abuf, (char *)ip6, min(length, clen)); |
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snapend = abuf + clen; |
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packetp = bp = abuf; |
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ip6 = (struct ip6_hdr *)abuf; |
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/* We really want libpcap to give us aligned packets */ |
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if (!didwarn) { |
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warning("compensating for unaligned libpcap packets"); |
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++didwarn; |
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} |
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} |
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if (length < sizeof (struct ip6_hdr)) { |
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(void)printf("truncated-ip6 %d", length); |
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goto out; |
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} |
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if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { |
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(void)printf("bad-ip6-version %u", ip6->ip6_vfc >> 4); |
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goto out; |
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} |
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hlen = sizeof(struct ip6_hdr); |
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len = ntohs(ip6->ip6_plen); |
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if (length < len + hlen) |
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(void)printf("truncated-ip6 - %d bytes missing!", |
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len + hlen - length); |
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cp = (const u_char *)ip6; |
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nh = ip6->ip6_nxt; |
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while (cp + hlen <= snapend) { |
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cp += hlen; |
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#ifndef IPPROTO_IPV4 |
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#define IPPROTO_IPV4 4 |
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#endif |
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if (cp == (u_char *)(ip6 + 1) && |
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nh != IPPROTO_TCP && nh != IPPROTO_UDP && |
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nh != IPPROTO_ESP && nh != IPPROTO_AH && |
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(vflag || (nh != IPPROTO_IPV4 && nh != IPPROTO_IPV6))) { |
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(void)printf("%s > %s: ", ip6addr_string(&ip6->ip6_src), |
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ip6addr_string(&ip6->ip6_dst)); |
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} |
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switch (nh) { |
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case IPPROTO_HOPOPTS: |
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hlen = hbhopt_print(cp); |
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nh = *cp; |
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break; |
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case IPPROTO_DSTOPTS: |
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hlen = dstopt_print(cp); |
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nh = *cp; |
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break; |
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case IPPROTO_FRAGMENT: |
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hlen = frag6_print(cp, (const u_char *)ip6); |
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if (snapend < cp + hlen) |
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goto end; |
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nh = *cp; |
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break; |
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case IPPROTO_ROUTING: |
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hlen = rt6_print(cp, (const u_char *)ip6); |
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nh = *cp; |
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break; |
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case IPPROTO_TCP: |
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tcp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp), |
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(const u_char *)ip6); |
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goto end; |
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case IPPROTO_UDP: |
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udp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp), |
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(const u_char *)ip6); |
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goto end; |
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case IPPROTO_ESP: |
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esp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp), |
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(const u_char *)ip6); |
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goto end; |
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case IPPROTO_AH: |
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ah_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp), |
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(const u_char *)ip6); |
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goto end; |
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case IPPROTO_ICMPV6: |
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icmp6_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp), |
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(const u_char *)ip6); |
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goto end; |
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case IPPROTO_PIM: |
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(void)printf("PIM"); |
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pim_print(cp, len); |
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goto end; |
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#ifndef IPPROTO_OSPF |
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#define IPPROTO_OSPF 89 |
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#endif |
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case IPPROTO_OSPF: |
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ospf6_print(cp, len); |
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goto end; |
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case IPPROTO_IPV6: |
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ip6_print(cp, len); |
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if (! vflag) |
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printf(" (encap)"); |
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goto end; |
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case IPPROTO_IPV4: |
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ip_print(cp, len); |
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if (! vflag) |
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printf(" (encap)"); |
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goto end; |
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#ifndef IPPROTO_GRE |
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#define IPPROTO_GRE 47 |
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#endif |
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case IPPROTO_GRE: |
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gre_print(cp, len); |
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if (! vflag) { |
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printf(" (gre encap)"); |
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goto out; |
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} |
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goto end; |
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case IPPROTO_NONE: |
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(void)printf("no next header"); |
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goto end; |
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#ifndef IPPROTO_CARP |
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#define IPPROTO_CARP 112 |
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#endif |
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case IPPROTO_CARP: |
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if (packettype == PT_VRRP) |
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vrrp_print(cp, len, ip6->ip6_hlim); |
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else |
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carp_print(cp, len, ip6->ip6_hlim); |
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break; |
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default: |
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(void)printf("ip-proto-%d %d", ip6->ip6_nxt, len); |
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goto end; |
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} |
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if (hlen == 0) |
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break; |
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} |
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end: |
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flow = ntohl(ip6->ip6_flow); |
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#if 0 |
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/* rfc1883 */ |
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if (flow & 0x0f000000) |
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(void)printf(" [pri 0x%x]", (flow & 0x0f000000) >> 24); |
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if (flow & 0x00ffffff) |
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(void)printf(" [flowlabel 0x%x]", flow & 0x00ffffff); |
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#else |
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/* RFC 2460 */ |
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if (flow & 0x0ff00000) |
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(void)printf(" [class 0x%x]", (flow & 0x0ff00000) >> 20); |
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if (flow & 0x000fffff) |
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(void)printf(" [flowlabel 0x%x]", flow & 0x000fffff); |
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#endif |
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if (ip6->ip6_hlim <= 1) |
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(void)printf(" [hlim %d]", (int)ip6->ip6_hlim); |
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if (vflag) { |
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printf(" ("); |
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(void)printf("len %d", len); |
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if (ip6->ip6_hlim > 1) |
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(void)printf(", hlim %d", (int)ip6->ip6_hlim); |
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printf(")"); |
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} |
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out: |
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packetp = pktp; |
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snapend = send; |
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} |
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#endif /* INET6 */ |