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/* $OpenBSD: print-ip6.c,v 1.30 2020/01/24 22:46:37 procter Exp $ */
/*
* 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.
*/
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include <netinet/tcp.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "interface.h"
#include "addrtoname.h"
#include <netinet/ip6.h>
/*
* print an IP6 datagram.
*/
void
ip6_print(const u_char *bp, u_int length)
{
const struct ip6_hdr *ip6;
int hlen;
int len;
const u_char *cp;
const u_char *pktp = packetp;
const u_char *send = snapend;
int nh;
u_int flow;
ip6 = (const struct ip6_hdr *)bp;
if ((u_char *)(ip6 + 1) > snapend) {
printf("[|ip6]");
return;
}
/*
* The IP header is not word aligned, so copy into abuf.
* This will never happen with BPF. It does happen with
* raw packet dumps from -r.
*/
if ((intptr_t)ip6 & (sizeof(u_int32_t)-1)) {
static u_char *abuf = NULL;
static int didwarn = 0;
int clen = snapend - bp;
if (clen > snaplen)
clen = snaplen;
if (abuf == NULL) {
abuf = malloc(snaplen);
if (abuf == NULL)
error("ip6_print: malloc");
}
memmove((char *)abuf, (char *)ip6, min(length, clen));
snapend = abuf + clen;
packetp = bp = abuf;
ip6 = (struct ip6_hdr *)abuf;
/* We really want libpcap to give us aligned packets */
if (!didwarn) {
warning("compensating for unaligned libpcap packets");
++didwarn;
}
}
if (length < sizeof (struct ip6_hdr)) {
printf("truncated-ip6 %d", length);
goto out;
}
if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
printf("bad-ip6-version %u", ip6->ip6_vfc >> 4);
goto out;
}
hlen = sizeof(struct ip6_hdr);
len = ntohs(ip6->ip6_plen);
if (length < len + hlen)
printf("truncated-ip6 - %d bytes missing!",
len + hlen - length);
cp = (const u_char *)ip6;
nh = ip6->ip6_nxt;
while (cp + hlen <= snapend) {
cp += hlen;
#ifndef IPPROTO_IPV4
#define IPPROTO_IPV4 4
#endif
if (cp == (u_char *)(ip6 + 1) &&
nh != IPPROTO_TCP && nh != IPPROTO_UDP &&
nh != IPPROTO_AH &&
(vflag || (nh != IPPROTO_IPV4 && nh != IPPROTO_IPV6))) {
printf("%s > %s: ", ip6addr_string(&ip6->ip6_src),
ip6addr_string(&ip6->ip6_dst));
}
switch (nh) {
case IPPROTO_HOPOPTS:
hlen = hbhopt_print(cp);
nh = *cp;
break;
case IPPROTO_DSTOPTS:
hlen = dstopt_print(cp);
nh = *cp;
break;
case IPPROTO_FRAGMENT:
hlen = frag6_print(cp, (const u_char *)ip6);
if (snapend < cp + hlen)
goto end;
nh = *cp;
break;
case IPPROTO_ROUTING:
hlen = rt6_print(cp, (const u_char *)ip6);
nh = *cp;
break;
case IPPROTO_TCP:
tcp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
(const u_char *)ip6);
goto end;
case IPPROTO_UDP:
udp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
(const u_char *)ip6);
goto end;
case IPPROTO_ESP:
esp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
(const u_char *)ip6);
goto end;
case IPPROTO_AH:
ah_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
(const u_char *)ip6);
goto end;
case IPPROTO_ICMPV6:
icmp6_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
(const u_char *)ip6);
goto end;
case IPPROTO_PIM:
printf("PIM");
pim_print(cp, len);
goto end;
#ifndef IPPROTO_OSPF
#define IPPROTO_OSPF 89
#endif
case IPPROTO_OSPF:
ospf6_print(cp, len);
goto end;
case IPPROTO_IPV6:
ip6_print(cp, len);
if (! vflag)
printf(" (encap)");
goto end;
case IPPROTO_IPV4:
ip_print(cp, len);
if (! vflag)
printf(" (encap)");
goto end;
#ifndef IPPROTO_GRE
#define IPPROTO_GRE 47
#endif
case IPPROTO_GRE:
gre_print(cp, len);
goto end;
case IPPROTO_NONE:
printf("no next header");
goto end;
#ifndef IPPROTO_ETHERIP
#define IPPROTO_ETHERIP 97
#endif
case IPPROTO_ETHERIP:
etherip_print(cp, snapend - cp, len);
goto end;
#ifndef IPPROTO_CARP
#define IPPROTO_CARP 112
#endif
case IPPROTO_CARP:
if (packettype == PT_VRRP)
vrrp_print(cp, len, ip6->ip6_hlim);
else
carp_print(cp, len, ip6->ip6_hlim);
break;
default:
printf("ip-proto-%d %d", ip6->ip6_nxt, len);
goto end;
}
if (hlen == 0)
break;
}
end:
flow = ntohl(ip6->ip6_flow);
if (flow & 0x0ff00000)
printf(" [class 0x%x]", (flow & 0x0ff00000) >> 20);
if (flow & 0x000fffff)
printf(" [flowlabel 0x%x]", flow & 0x000fffff);
if (ip6->ip6_hlim <= 1)
printf(" [hlim %d]", (int)ip6->ip6_hlim);
if (vflag) {
printf(" (");
printf("len %d", len);
if (ip6->ip6_hlim > 1)
printf(", hlim %d", (int)ip6->ip6_hlim);
printf(")");
}
out:
packetp = pktp;
snapend = send;
}
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