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wireshark/packet-ipv6.c

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/* packet-ipv6.c
* Routines for IPv6 packet disassembly
*
* $Id: packet-ipv6.c,v 1.61 2001/06/29 09:46:52 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* Copyright 1998 Gerald Combs
*
* MobileIPv6 support added by Tomislav Borosa <tomislav.borosa@siemens.hr>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_SYS_SOCKET_h
#include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#include <string.h>
#include <stdio.h>
#include <glib.h>
#include "packet.h"
#include "packet-ip.h"
#include "packet-ipsec.h"
#include "packet-ipv6.h"
#include "packet-tcp.h"
#include "packet-udp.h"
#include "resolv.h"
#include "prefs.h"
#include "reassemble.h"
#include "ipproto.h"
#include "etypes.h"
#include "ppptypes.h"
#include "aftypes.h"
/*
* NOTE: ipv6.nxt is not very useful as we will have chained header.
* now testing ipv6.final, but it raises SEGV.
#define TEST_FINALHDR
*/
static int proto_ipv6 = -1;
static int hf_ipv6_version = -1;
static int hf_ipv6_class = -1;
static int hf_ipv6_flow = -1;
static int hf_ipv6_plen = -1;
static int hf_ipv6_nxt = -1;
static int hf_ipv6_hlim = -1;
static int hf_ipv6_src = -1;
static int hf_ipv6_dst = -1;
static int hf_ipv6_addr = -1;
#ifdef TEST_FINALHDR
static int hf_ipv6_final = -1;
#endif
static int hf_ipv6_fragments = -1;
static int hf_ipv6_fragment = -1;
static int hf_ipv6_fragment_overlap = -1;
static int hf_ipv6_fragment_overlap_conflict = -1;
static int hf_ipv6_fragment_multiple_tails = -1;
static int hf_ipv6_fragment_too_long_fragment = -1;
static int hf_ipv6_fragment_error = -1;
static int hf_ipv6_mipv6_type = -1;
static int hf_ipv6_mipv6_length = -1;
static int hf_ipv6_mipv6_a_flag = -1;
static int hf_ipv6_mipv6_h_flag = -1;
static int hf_ipv6_mipv6_r_flag = -1;
static int hf_ipv6_mipv6_d_flag = -1;
static int hf_ipv6_mipv6_m_flag = -1;
static int hf_ipv6_mipv6_b_flag = -1;
static int hf_ipv6_mipv6_prefix_length = -1;
static int hf_ipv6_mipv6_sequence_number = -1;
static int hf_ipv6_mipv6_life_time = -1;
static int hf_ipv6_mipv6_status = -1;
static int hf_ipv6_mipv6_refresh = -1;
static int hf_ipv6_mipv6_home_address = -1;
static int hf_ipv6_mipv6_sub_type = -1;
static int hf_ipv6_mipv6_sub_length = -1;
static int hf_ipv6_mipv6_sub_unique_ID = -1;
static int hf_ipv6_mipv6_sub_alternative_COA = -1;
static gint ett_ipv6 = -1;
static gint ett_ipv6_fragments = -1;
static gint ett_ipv6_fragment = -1;
/* Reassemble fragmented datagrams */
static gboolean ipv6_reassemble = FALSE;
#ifndef offsetof
#define offsetof(type, member) ((size_t)(&((type *)0)->member))
#endif
/*
* defragmentation of IPv6
*/
static GHashTable *ipv6_fragment_table = NULL;
static void
ipv6_reassemble_init(void)
{
fragment_table_init(&ipv6_fragment_table);
}
static int
dissect_routing6(tvbuff_t *tvb, int offset, proto_tree *tree) {
struct ip6_rthdr rt;
int len;
proto_tree *rthdr_tree;
proto_item *ti;
char buf[sizeof(struct ip6_rthdr0) + sizeof(struct e_in6_addr) * 23];
tvb_memcpy(tvb, (guint8 *)&rt, offset, sizeof(rt));
len = (rt.ip6r_len + 1) << 3;
if (tree) {
/* !!! specify length */
ti = proto_tree_add_text(tree, tvb, offset, len,
"Routing Header, Type %u", rt.ip6r_type);
rthdr_tree = proto_item_add_subtree(ti, ett_ipv6);
proto_tree_add_text(rthdr_tree, tvb,
offset + offsetof(struct ip6_rthdr, ip6r_nxt), 1,
"Next header: %s (0x%02x)", ipprotostr(rt.ip6r_nxt), rt.ip6r_nxt);
proto_tree_add_text(rthdr_tree, tvb,
offset + offsetof(struct ip6_rthdr, ip6r_len), 1,
"Length: %u (%d bytes)", rt.ip6r_len, len);
proto_tree_add_text(rthdr_tree, tvb,
offset + offsetof(struct ip6_rthdr, ip6r_type), 1,
"Type: %u", rt.ip6r_type);
proto_tree_add_text(rthdr_tree, tvb,
offset + offsetof(struct ip6_rthdr, ip6r_segleft), 1,
"Segments left: %u", rt.ip6r_segleft);
if (rt.ip6r_type == 0 && len <= sizeof(buf)) {
struct e_in6_addr *a;
int n;
struct ip6_rthdr0 *rt0;
tvb_memcpy(tvb, buf, offset, len);
rt0 = (struct ip6_rthdr0 *)buf;
for (a = rt0->ip6r0_addr, n = 0;
a < (struct e_in6_addr *)(buf + len);
a++, n++) {
proto_tree_add_text(rthdr_tree, tvb,
offset + offsetof(struct ip6_rthdr0, ip6r0_addr) + n * sizeof(struct e_in6_addr),
sizeof(struct e_in6_addr),
#ifdef INET6
"address %d: %s (%s)",
n, get_hostname6(a), ip6_to_str(a)
#else
"address %d: %s", n, ip6_to_str(a)
#endif
);
}
}
/* decode... */
}
return len;
}
static int
dissect_frag6(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree,
guint16 *offlg, guint32 *ident) {
struct ip6_frag frag;
int len;
proto_item *ti;
proto_tree *rthdr_tree;
tvb_memcpy(tvb, (guint8 *)&frag, offset, sizeof(frag));
len = sizeof(frag);
frag.ip6f_offlg = ntohs(frag.ip6f_offlg);
*offlg = frag.ip6f_offlg;
*ident = frag.ip6f_ident;
if (check_col(pinfo->fd, COL_INFO)) {
col_add_fstr(pinfo->fd, COL_INFO,
"IPv6 fragment (nxt=%s (0x%02x) off=%u id=0x%x)",
ipprotostr(frag.ip6f_nxt), frag.ip6f_nxt,
frag.ip6f_offlg & IP6F_OFF_MASK, frag.ip6f_ident);
}
if (tree) {
ti = proto_tree_add_text(tree, tvb, offset, len,
"Fragmention Header");
rthdr_tree = proto_item_add_subtree(ti, ett_ipv6);
proto_tree_add_text(rthdr_tree, tvb,
offset + offsetof(struct ip6_frag, ip6f_nxt), 1,
"Next header: %s (0x%02x)",
ipprotostr(frag.ip6f_nxt), frag.ip6f_nxt);
#if 0
proto_tree_add_text(rthdr_tree, tvb,
offset + offsetof(struct ip6_frag, ip6f_reserved), 1,
"Reserved: %u",
frag.ip6f_reserved);
#endif
proto_tree_add_text(rthdr_tree, tvb,
offset + offsetof(struct ip6_frag, ip6f_offlg), 2,
"Offset: %u",
frag.ip6f_offlg & IP6F_OFF_MASK);
proto_tree_add_text(rthdr_tree, tvb,
offset + offsetof(struct ip6_frag, ip6f_offlg), 2,
"More fragments: %s",
frag.ip6f_offlg & IP6F_MORE_FRAG ?
"Yes" : "No");
proto_tree_add_text(rthdr_tree, tvb,
offset + offsetof(struct ip6_frag, ip6f_ident), 4,
"Identification: 0x%08x",
frag.ip6f_ident);
}
return len;
}
/* Binding Update flag description */
static const true_false_string ipv6_mipv6_bu_a_flag_value = {
"Binding Acknowledgement requested",
"Binding Acknowledgement not requested"
};
static const true_false_string ipv6_mipv6_bu_h_flag_value = {
"Home Registration",
"No Home Registration"
};
static const true_false_string ipv6_mipv6_bu_r_flag_value = {
"Router",
"Not a Router"
};
static const true_false_string ipv6_mipv6_bu_d_flag_value = {
"Perform Duplicate Address Detection",
"Do not perform Duplicate Address Detection"
};
static const true_false_string ipv6_mipv6_bu_m_flag_value = {
"MAP Registration",
"No MAP Registration"
};
static const true_false_string ipv6_mipv6_bu_b_flag_value = {
"Request for bicasting",
"Do not request for bicasting"
};
static int
dissect_mipv6_ba(tvbuff_t *tvb, proto_tree *dstopt_tree, int offset)
{
guint8 status, len = 0;
const char *status_text;
gboolean sub_options = FALSE;
proto_tree_add_uint_format(dstopt_tree, hf_ipv6_mipv6_type, tvb,
offset + len, IP6_MIPv6_OPTION_TYPE_LENGTH,
tvb_get_guint8(tvb, offset + len),
"Option Type: %u (0x%02x) - Binding Acknowledgement",
tvb_get_guint8(tvb, offset + len),
tvb_get_guint8(tvb, offset + len));
len += IP6_MIPv6_OPTION_TYPE_LENGTH;
if (tvb_get_guint8(tvb, offset + len) > 11)
sub_options = TRUE;
proto_tree_add_uint(dstopt_tree, hf_ipv6_mipv6_length, tvb, offset + len,
IP6_MIPv6_OPTION_LENGTH_LENGTH, tvb_get_guint8(tvb, offset + len));
len += IP6_MIPv6_OPTION_LENGTH_LENGTH;
status = tvb_get_guint8(tvb, offset + len);
switch (status) {
case BA_OK:
status_text = "- Binding Update accepted";
break;
case BA_REAS_UNSPEC:
status_text = "- Binding Update was rejected - Reason unspecified";
break;
case BA_ADMIN_PROH:
status_text = "- Binding Update was rejected - Administratively prohibited";
break;
case BA_INSUF_RES:
status_text = "- Binding Update was rejected - Insufficient resources";
break;
case BA_NO_HR:
status_text = "- Binding Update was rejected - Home registration not supported";
break;
case BA_NO_SUBNET:
status_text = "- Binding Update was rejected - Not home subnet";
break;
case BA_ERR_ID_LEN:
status_text = "- Binding Update was rejected - Incorrect interface identifier length";
break;
case BA_NO_HA:
status_text = "- Binding Update was rejected - Not home agent for this mobile node";
break;
case BA_DUPL_ADDR:
status_text = "- Binding Update was rejected - Duplicate Address Detection failed";
break;
default:
status_text = NULL;
break;
}
if (!status_text) {
if (status > 128)
status_text = "- Binding Update was rejected";
else
status_text = "";
}
proto_tree_add_uint_format(dstopt_tree, hf_ipv6_mipv6_status,
tvb, offset + len, IP6_MIPv6_STATUS_LENGTH,
tvb_get_guint8(tvb, offset + len),
"Status: %u %s", tvb_get_guint8(tvb, offset + len), status_text);
len += IP6_MIPv6_STATUS_LENGTH;
proto_tree_add_uint(dstopt_tree, hf_ipv6_mipv6_sequence_number,
tvb, offset + len, IP6_MIPv6_SEQUENCE_NUMBER_LENGTH,
tvb_get_ntohs(tvb, offset + len));
len += IP6_MIPv6_SEQUENCE_NUMBER_LENGTH;
if (tvb_get_ntohl(tvb, offset + len) == 0xffffffff) {
proto_tree_add_uint_format(dstopt_tree, hf_ipv6_mipv6_life_time,
tvb, offset + len, IP6_MIPv6_LIFE_TIME_LENGTH,
tvb_get_ntohl(tvb, offset + len),
"Life Time: %u - Infinity", tvb_get_ntohl(tvb, offset + len));
} else {
proto_tree_add_uint(dstopt_tree, hf_ipv6_mipv6_life_time,
tvb, offset + len, IP6_MIPv6_LIFE_TIME_LENGTH,
tvb_get_ntohl(tvb, offset + len));
}
len += IP6_MIPv6_LIFE_TIME_LENGTH;
proto_tree_add_uint(dstopt_tree, hf_ipv6_mipv6_refresh, tvb,
offset + len, IP6_MIPv6_REFRESH_LENGTH,
tvb_get_ntohl(tvb, offset + len));
len += IP6_MIPv6_REFRESH_LENGTH;
/* sub - options */
if (sub_options)
proto_tree_add_text(dstopt_tree, tvb, offset + len, 1, "Sub-Options");
return len;
}
static int
dissect_mipv6_bu(tvbuff_t *tvb, proto_tree *dstopt_tree, int offset)
{
int len = 0;
gboolean sub_options = FALSE;
proto_tree_add_uint_format(dstopt_tree, hf_ipv6_mipv6_type, tvb, offset,
IP6_MIPv6_OPTION_TYPE_LENGTH, tvb_get_guint8(tvb, offset),
"Option Type: %u (0x%02x) - Binding Update",
tvb_get_guint8(tvb, offset), tvb_get_guint8(tvb, offset));
len += IP6_MIPv6_OPTION_TYPE_LENGTH;
if (tvb_get_guint8(tvb, offset + len) > 8)
sub_options = TRUE;
proto_tree_add_uint(dstopt_tree, hf_ipv6_mipv6_length, tvb, offset + len,
IP6_MIPv6_OPTION_LENGTH_LENGTH, tvb_get_guint8(tvb, offset + len));
len += IP6_MIPv6_OPTION_LENGTH_LENGTH;
proto_tree_add_boolean(dstopt_tree, hf_ipv6_mipv6_a_flag, tvb, offset + len,
IP6_MIPv6_FLAGS_LENGTH, tvb_get_guint8(tvb, offset + len));
proto_tree_add_boolean(dstopt_tree, hf_ipv6_mipv6_h_flag, tvb, offset + len,
IP6_MIPv6_FLAGS_LENGTH, tvb_get_guint8(tvb, offset + len));
proto_tree_add_boolean(dstopt_tree, hf_ipv6_mipv6_r_flag, tvb, offset + len,
IP6_MIPv6_FLAGS_LENGTH, tvb_get_guint8(tvb, offset + len));
proto_tree_add_boolean(dstopt_tree, hf_ipv6_mipv6_d_flag, tvb, offset + len,
IP6_MIPv6_FLAGS_LENGTH, tvb_get_guint8(tvb, offset + len));
proto_tree_add_boolean(dstopt_tree, hf_ipv6_mipv6_m_flag, tvb, offset + len,
IP6_MIPv6_FLAGS_LENGTH, tvb_get_guint8(tvb, offset + len));
proto_tree_add_boolean(dstopt_tree, hf_ipv6_mipv6_b_flag, tvb, offset + len,
IP6_MIPv6_FLAGS_LENGTH, tvb_get_guint8(tvb, offset + len));
len += IP6_MIPv6_FLAGS_LENGTH;
proto_tree_add_uint(dstopt_tree, hf_ipv6_mipv6_prefix_length, tvb,
offset + len,
IP6_MIPv6_PREFIX_LENGTH_LENGTH, tvb_get_guint8(tvb, offset + len));
len += IP6_MIPv6_PREFIX_LENGTH_LENGTH;
proto_tree_add_uint(dstopt_tree, hf_ipv6_mipv6_sequence_number, tvb,
offset + len, IP6_MIPv6_SEQUENCE_NUMBER_LENGTH,
tvb_get_ntohs(tvb, offset + len));
len += IP6_MIPv6_SEQUENCE_NUMBER_LENGTH;
if (tvb_get_ntohl(tvb, offset + len) == 0xffffffff) {
proto_tree_add_uint_format(dstopt_tree, hf_ipv6_mipv6_life_time, tvb,
offset + len, IP6_MIPv6_LIFE_TIME_LENGTH,
tvb_get_ntohl(tvb, offset + len), "Life Time: %u - Infinity",
tvb_get_ntohl(tvb, offset + len));
} else {
proto_tree_add_uint(dstopt_tree, hf_ipv6_mipv6_life_time, tvb,
offset + len, IP6_MIPv6_LIFE_TIME_LENGTH, tvb_get_ntohl(tvb,
offset + len));
}
len += IP6_MIPv6_LIFE_TIME_LENGTH;
/* sub - options */
if (sub_options)
proto_tree_add_text(dstopt_tree, tvb, offset + len, 1, "Sub-Options");
return len;
}
static int
dissect_mipv6_ha(tvbuff_t *tvb, proto_tree *dstopt_tree, int offset)
{
int len = 0;
gboolean sub_options = FALSE;
proto_tree_add_uint_format(dstopt_tree, hf_ipv6_mipv6_type, tvb,
offset + len, IP6_MIPv6_OPTION_TYPE_LENGTH,
tvb_get_guint8(tvb, offset + len),
"Option Type: %u (0x%02x) - Home Address",
tvb_get_guint8(tvb, offset + len), tvb_get_guint8(tvb, offset + len));
len += IP6_MIPv6_OPTION_TYPE_LENGTH;
if (tvb_get_guint8(tvb, offset + len) > 16)
sub_options = TRUE;
proto_tree_add_uint(dstopt_tree, hf_ipv6_mipv6_length, tvb, offset + len,
IP6_MIPv6_OPTION_LENGTH_LENGTH, tvb_get_guint8(tvb, offset + len));
len += IP6_MIPv6_OPTION_LENGTH_LENGTH;
proto_tree_add_ipv6(dstopt_tree, hf_ipv6_mipv6_home_address, tvb,
offset + len, IP6_MIPv6_HOME_ADDRESS_LENGTH,
tvb_get_ptr(tvb, offset + len, IP6_MIPv6_HOME_ADDRESS_LENGTH));
len += IP6_MIPv6_HOME_ADDRESS_LENGTH;
/* sub - options */
if (sub_options)
proto_tree_add_text(dstopt_tree, tvb, offset + len, 1, "Sub-Options");
return len;
}
static int
dissect_mipv6_br(tvbuff_t *tvb, proto_tree *dstopt_tree, int offset)
{
int len = 0;
gboolean sub_options = FALSE;
proto_tree_add_uint_format(dstopt_tree, hf_ipv6_mipv6_type, tvb,
offset + len, IP6_MIPv6_OPTION_TYPE_LENGTH,
tvb_get_guint8(tvb, offset + len),
"Option Type: %u (0x%02x) - Binding Request",
tvb_get_guint8(tvb, offset + len), tvb_get_guint8(tvb, offset + len));
len += IP6_MIPv6_OPTION_TYPE_LENGTH;
if (tvb_get_guint8(tvb, offset + len) > 0)
sub_options = TRUE;
proto_tree_add_uint(dstopt_tree, hf_ipv6_mipv6_length, tvb, offset + len,
IP6_MIPv6_OPTION_LENGTH_LENGTH, tvb_get_guint8(tvb, offset + len));
len += IP6_MIPv6_OPTION_LENGTH_LENGTH;
/* sub - options */
if (sub_options)
proto_tree_add_text(dstopt_tree, tvb, offset + len, 1, "Sub-Options");
return len;
}
static int
dissect_mipv6_sub_u(tvbuff_t *tvb, proto_tree *dstopt_tree, int offset)
{
int len = 0;
proto_tree_add_uint_format(dstopt_tree, hf_ipv6_mipv6_sub_length, tvb,
offset + len, IP6_MIPv6_SUB_TYPE_LENGTH,
tvb_get_guint8(tvb, offset + len),
"Sub-Option Type: %u (0x%02x) - Unique Identifier Sub-Option",
tvb_get_guint8(tvb, offset + len), tvb_get_guint8(tvb, offset + len));
len += IP6_MIPv6_SUB_TYPE_LENGTH;
proto_tree_add_uint(dstopt_tree, hf_ipv6_mipv6_sub_length, tvb,
offset + len, IP6_MIPv6_SUB_LENGTH_LENGTH,
tvb_get_guint8(tvb, offset + len));
len += IP6_MIPv6_SUB_LENGTH_LENGTH;
proto_tree_add_uint(dstopt_tree, hf_ipv6_mipv6_sub_unique_ID, tvb,
offset + len, IP6_MIPv6_SUB_UNIQUE_ID_LENGTH,
tvb_get_ntohs(tvb, offset + len));
len += IP6_MIPv6_SUB_UNIQUE_ID_LENGTH;
return len;
}
static int
dissect_mipv6_sub_a_coa(tvbuff_t *tvb, proto_tree *dstopt_tree, int offset)
{
int len = 0;
proto_tree_add_uint_format(dstopt_tree, hf_ipv6_mipv6_sub_type, tvb,
offset + len, IP6_MIPv6_SUB_TYPE_LENGTH,
tvb_get_guint8(tvb, offset + len),
"Sub-Option Type: %u (0x%02x) - Alternative Care Of Address",
tvb_get_guint8(tvb, offset + len),
tvb_get_guint8(tvb, offset + len));
len += IP6_MIPv6_SUB_TYPE_LENGTH;
proto_tree_add_uint(dstopt_tree, hf_ipv6_mipv6_sub_length, tvb,
offset + len, IP6_MIPv6_SUB_LENGTH_LENGTH,
tvb_get_guint8(tvb, offset + len));
len += IP6_MIPv6_SUB_LENGTH_LENGTH;
proto_tree_add_ipv6(dstopt_tree, hf_ipv6_mipv6_sub_alternative_COA, tvb,
offset + len, IP6_MIPv6_SUB_ALTERNATIVE_COA_LENGTH,
tvb_get_ptr(tvb, offset + len, IP6_MIPv6_SUB_ALTERNATIVE_COA_LENGTH));
len += IP6_MIPv6_SUB_ALTERNATIVE_COA_LENGTH;
return len;
}
static const value_string rtalertvals[] = {
{ IP6OPT_RTALERT_MLD, "MLD" },
{ IP6OPT_RTALERT_RSVP, "RSVP" },
{ 0, NULL },
};
static int
dissect_opts(tvbuff_t *tvb, int offset, proto_tree *tree, char *optname)
{
struct ip6_ext ext;
int len;
proto_tree *dstopt_tree;
proto_item *ti;
gint p;
guint8 tmp;
int mip_offset = 0, delta = 0;
tvb_memcpy(tvb, (guint8 *)&ext, offset, sizeof(ext));
len = (ext.ip6e_len + 1) << 3;
if (tree) {
/* !!! specify length */
ti = proto_tree_add_text(tree, tvb, offset, len, "%s Header ", optname);
dstopt_tree = proto_item_add_subtree(ti, ett_ipv6);
proto_tree_add_text(dstopt_tree, tvb,
offset + offsetof(struct ip6_ext, ip6e_nxt), 1,
"Next header: %s (0x%02x)", ipprotostr(ext.ip6e_nxt), ext.ip6e_nxt);
proto_tree_add_text(dstopt_tree, tvb,
offset + offsetof(struct ip6_ext, ip6e_len), 1,
"Length: %u (%d bytes)", ext.ip6e_len, len);
mip_offset = offset;
mip_offset += 2;
p = offset + 2;
while (p < offset + len) {
switch (tvb_get_guint8(tvb, p)) {
case IP6OPT_PAD1:
proto_tree_add_text(dstopt_tree, tvb, p, 1, "Pad1");
p++;
mip_offset++;
break;
case IP6OPT_PADN:
tmp = tvb_get_guint8(tvb, p + 1);
proto_tree_add_text(dstopt_tree, tvb, p, tmp + 2,
"PadN: %u bytes", tmp + 2);
p += tmp;
p += 2;
mip_offset += tvb_get_guint8(tvb, mip_offset + 1) + 2;
break;
case IP6OPT_JUMBO:
tmp = tvb_get_guint8(tvb, p + 1);
if (tmp == 4) {
proto_tree_add_text(dstopt_tree, tvb, p, tmp + 2,
"Jumbo payload: %u (%u bytes)",
tvb_get_ntohl(tvb, p + 2), tmp + 2);
} else {
proto_tree_add_text(dstopt_tree, tvb, p, tmp + 2,
"Jumbo payload: Invalid length (%u bytes)",
tmp + 2);
}
p += tmp;
p += 2;
mip_offset += tvb_get_guint8(tvb, mip_offset+1)+2;
break;
case IP6OPT_RTALERT:
{
char *rta;
tmp = tvb_get_guint8(tvb, p + 1);
if (tmp == 2) {
rta = val_to_str(tvb_get_ntohs(tvb, p + 2), rtalertvals,
"Unknown");
} else
rta = "Invalid length";
ti = proto_tree_add_text(dstopt_tree, tvb, p , tmp + 2,
"Router alert: %s (%u bytes)", rta, tmp + 2);
p += tmp;
p += 2;
mip_offset += tvb_get_guint8(tvb, mip_offset + 1) + 2;
break;
}
case IP6OPT_BINDING_UPDATE :
delta = dissect_mipv6_bu(tvb, dstopt_tree, mip_offset);
p += delta;
mip_offset += delta;
break;
case IP6OPT_BINDING_ACK :
delta = dissect_mipv6_ba(tvb, dstopt_tree, mip_offset);
p += delta;
mip_offset += delta;
break;
case IP6OPT_HOME_ADDRESS :
delta = dissect_mipv6_ha(tvb, dstopt_tree, mip_offset);
p += delta;
mip_offset += delta;
break;
case IP6OPT_BINDING_REQUEST :
delta = dissect_mipv6_br(tvb, dstopt_tree, mip_offset);
p += delta;
mip_offset += delta;
break;
case IP6OPT_MIPv6_UNIQUE_ID_SUB :
delta = dissect_mipv6_sub_u(tvb, dstopt_tree, mip_offset);
p += delta;
mip_offset += delta;
break;
case IP6OPT_MIPv6_ALTERNATIVE_COA_SUB :
delta = dissect_mipv6_sub_a_coa(tvb, dstopt_tree, mip_offset);
p += delta;
mip_offset += delta;
break;
default:
p = offset + len;
break;
}
}
/* decode... */
}
return len;
}
static int
dissect_hopopts(tvbuff_t *tvb, int offset, proto_tree *tree)
{
return dissect_opts(tvb, offset, tree, "Hop-by-hop Option");
}
static int
dissect_dstopts(tvbuff_t *tvb, int offset, proto_tree *tree)
{
return dissect_opts(tvb, offset, tree, "Destination Option");
}
static void
dissect_ipv6(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_tree *ipv6_tree = NULL;
proto_item *ti;
guint8 nxt;
int advance;
int poffset;
guint16 plen;
gboolean frag;
guint16 offlg;
guint32 ident;
int offset;
fragment_data *ipfd_head;
tvbuff_t *next_tvb;
packet_info save_pi;
gboolean must_restore_pi = FALSE;
gboolean update_col_info = TRUE;
struct ip6_hdr ipv6;
if (check_col(pinfo->fd, COL_PROTOCOL))
col_set_str(pinfo->fd, COL_PROTOCOL, "IPv6");
if (check_col(pinfo->fd, COL_INFO))
col_clear(pinfo->fd, COL_INFO);
offset = 0;
tvb_memcpy(tvb, (guint8 *)&ipv6, offset, sizeof(ipv6));
pinfo->ipproto = ipv6.ip6_nxt; /* XXX make work TCP follow (ipproto = 6) */
/* Get the payload length */
plen = ntohs(ipv6.ip6_plen);
/* Adjust the length of this tvbuff to include only the IPv6 datagram. */
set_actual_length(tvb, pinfo, plen + sizeof (struct ip6_hdr));
SET_ADDRESS(&pinfo->net_src, AT_IPv6, 16, tvb_get_ptr(tvb, offset + IP6H_SRC, 16));
SET_ADDRESS(&pinfo->src, AT_IPv6, 16, tvb_get_ptr(tvb, offset + IP6H_SRC, 16));
SET_ADDRESS(&pinfo->net_dst, AT_IPv6, 16, tvb_get_ptr(tvb, offset + IP6H_DST, 16));
SET_ADDRESS(&pinfo->dst, AT_IPv6, 16, tvb_get_ptr(tvb, offset + IP6H_DST, 16));
if (tree) {
/* !!! specify length */
ti = proto_tree_add_item(tree, proto_ipv6, tvb, offset, 40, FALSE);
ipv6_tree = proto_item_add_subtree(ti, ett_ipv6);
/* !!! warning: version also contains 4 Bit priority */
proto_tree_add_uint(ipv6_tree, hf_ipv6_version, tvb,
offset + offsetof(struct ip6_hdr, ip6_vfc), 1,
(ipv6.ip6_vfc >> 4) & 0x0f);
proto_tree_add_uint(ipv6_tree, hf_ipv6_class, tvb,
offset + offsetof(struct ip6_hdr, ip6_flow), 4,
(guint8)((ntohl(ipv6.ip6_flow) >> 20) & 0xff));
/*
* there should be no alignment problems for ip6_flow, since it's the first
* guint32 in the ipv6 struct
*/
proto_tree_add_uint_format(ipv6_tree, hf_ipv6_flow, tvb,
offset + offsetof(struct ip6_hdr, ip6_flow), 4,
(unsigned long)(ntohl(ipv6.ip6_flow) & IPV6_FLOWLABEL_MASK),
"Flowlabel: 0x%05lx",
(unsigned long)(ntohl(ipv6.ip6_flow) & IPV6_FLOWLABEL_MASK));
proto_tree_add_uint(ipv6_tree, hf_ipv6_plen, tvb,
offset + offsetof(struct ip6_hdr, ip6_plen), 2,
plen);
proto_tree_add_uint_format(ipv6_tree, hf_ipv6_nxt, tvb,
offset + offsetof(struct ip6_hdr, ip6_nxt), 1,
ipv6.ip6_nxt,
"Next header: %s (0x%02x)",
ipprotostr(ipv6.ip6_nxt), ipv6.ip6_nxt);
proto_tree_add_uint(ipv6_tree, hf_ipv6_hlim, tvb,
offset + offsetof(struct ip6_hdr, ip6_hlim), 1,
ipv6.ip6_hlim);
proto_tree_add_ipv6_hidden(ipv6_tree, hf_ipv6_addr, tvb,
offset + offsetof(struct ip6_hdr, ip6_src), 16,
ipv6.ip6_src.s6_addr8);
proto_tree_add_ipv6_hidden(ipv6_tree, hf_ipv6_addr, tvb,
offset + offsetof(struct ip6_hdr, ip6_dst), 16,
ipv6.ip6_dst.s6_addr8);
proto_tree_add_ipv6_format(ipv6_tree, hf_ipv6_src, tvb,
offset + offsetof(struct ip6_hdr, ip6_src), 16,
(guint8 *)&ipv6.ip6_src,
#ifdef INET6
"Source address: %s (%s)",
get_hostname6(&ipv6.ip6_src),
#else
"Source address: %s",
#endif
ip6_to_str(&ipv6.ip6_src));
proto_tree_add_ipv6_format(ipv6_tree, hf_ipv6_dst, tvb,
offset + offsetof(struct ip6_hdr, ip6_dst), 16,
(guint8 *)&ipv6.ip6_dst,
#ifdef INET6
"Destination address: %s (%s)",
get_hostname6(&ipv6.ip6_dst),
#else
"Destination address: %s",
#endif
ip6_to_str(&ipv6.ip6_dst));
}
/* start of the new header (could be a extension header) */
poffset = offset + offsetof(struct ip6_hdr, ip6_nxt);
nxt = tvb_get_guint8(tvb, poffset);
offset += sizeof(struct ip6_hdr);
offlg = 0;
ident = 0;
/* start out assuming this isn't fragmented */
frag = FALSE;
again:
switch (nxt) {
case IP_PROTO_HOPOPTS:
advance = dissect_hopopts(tvb, offset, tree);
nxt = tvb_get_guint8(tvb, offset);
poffset = offset;
offset += advance;
plen -= advance;
goto again;
case IP_PROTO_ROUTING:
advance = dissect_routing6(tvb, offset, tree);
nxt = tvb_get_guint8(tvb, offset);
poffset = offset;
offset += advance;
plen -= advance;
goto again;
case IP_PROTO_FRAGMENT:
frag = TRUE;
advance = dissect_frag6(tvb, offset, pinfo, tree,
&offlg, &ident);
nxt = tvb_get_guint8(tvb, offset);
poffset = offset;
offset += advance;
plen -= advance;
goto again;
case IP_PROTO_AH:
advance = dissect_ah_header(
tvb_new_subset(tvb, offset, -1, -1),
pinfo, tree, NULL, NULL);
nxt = tvb_get_guint8(tvb, offset);
poffset = offset;
offset += advance;
plen -= advance;
goto again;
case IP_PROTO_DSTOPTS:
advance = dissect_dstopts(tvb, offset, tree);
nxt = tvb_get_guint8(tvb, offset);
poffset = offset;
offset += advance;
plen -= advance;
goto again;
}
#ifdef TEST_FINALHDR
proto_tree_add_uint_hidden(ipv6_tree, hf_ipv6_final, tvb, poffset, 1, nxt);
#endif
/* If ipv6_reassemble is on and this is a fragment, then just add the fragment
* to the hashtable.
*/
if (ipv6_reassemble && frag) {
/* We're reassembling, and this is part of a fragmented datagram.
Add the fragment to the hash table if the frame isn't truncated. */
if (tvb_reported_length(tvb) <= tvb_length(tvb)) {
ipfd_head = fragment_add(tvb, offset, pinfo, ident,
ipv6_fragment_table,
offlg & IP6F_OFF_MASK,
plen,
offlg & IP6F_MORE_FRAG);
} else {
ipfd_head = NULL;
}
if (ipfd_head != NULL) {
fragment_data *ipfd;
proto_tree *ft = NULL;
proto_item *fi = NULL;
/* OK, we have the complete reassembled payload. */
/* show all fragments */
fi = proto_tree_add_item(ipv6_tree, hf_ipv6_fragments,
tvb, 0, 0, FALSE);
ft = proto_item_add_subtree(fi, ett_ipv6_fragments);
for (ipfd = ipfd_head->next; ipfd; ipfd = ipfd->next){
if (ipfd->flags & (FD_OVERLAP|FD_OVERLAPCONFLICT
|FD_MULTIPLETAILS|FD_TOOLONGFRAGMENT) ) {
/* this fragment has some flags set, create a subtree
* for it and display the flags.
*/
proto_tree *fet = NULL;
proto_item *fei = NULL;
int hf;
if (ipfd->flags & (FD_OVERLAPCONFLICT
|FD_MULTIPLETAILS|FD_TOOLONGFRAGMENT) ) {
hf = hf_ipv6_fragment_error;
} else {
hf = hf_ipv6_fragment;
}
fei = proto_tree_add_none_format(ft, hf,
tvb, 0, 0,
"Frame:%d payload:%d-%d",
ipfd->frame,
ipfd->offset,
ipfd->offset+ipfd->len-1
);
fet = proto_item_add_subtree(fei, ett_ipv6_fragment);
if (ipfd->flags&FD_OVERLAP) {
proto_tree_add_boolean(fet,
hf_ipv6_fragment_overlap, tvb, 0, 0,
TRUE);
}
if (ipfd->flags&FD_OVERLAPCONFLICT) {
proto_tree_add_boolean(fet,
hf_ipv6_fragment_overlap_conflict, tvb, 0, 0,
TRUE);
}
if (ipfd->flags&FD_MULTIPLETAILS) {
proto_tree_add_boolean(fet,
hf_ipv6_fragment_multiple_tails, tvb, 0, 0,
TRUE);
}
if (ipfd->flags&FD_TOOLONGFRAGMENT) {
proto_tree_add_boolean(fet,
hf_ipv6_fragment_too_long_fragment, tvb, 0, 0,
TRUE);
}
} else {
/* nothing of interest for this fragment */
proto_tree_add_none_format(ft, hf_ipv6_fragment,
tvb, 0, 0,
"Frame:%d payload:%d-%d",
ipfd->frame,
ipfd->offset,
ipfd->offset+ipfd->len-1
);
}
}
if (ipfd_head->flags & (FD_OVERLAPCONFLICT
|FD_MULTIPLETAILS|FD_TOOLONGFRAGMENT) ) {
if (check_col(pinfo->fd, COL_INFO)) {
col_set_str(pinfo->fd, COL_INFO, "[Illegal fragments]");
update_col_info = FALSE;
}
}
/* Allocate a new tvbuff, referring to the reassembled payload. */
next_tvb = tvb_new_real_data(ipfd_head->data, ipfd_head->datalen,
ipfd_head->datalen, "Reassembled");
/* Add the tvbuff to the list of tvbuffs to which the tvbuff we
were handed refers, so it'll get cleaned up when that tvbuff
is cleaned up. */
tvb_set_child_real_data_tvbuff(tvb, next_tvb);
/* Add the defragmented data to the data source list. */
pinfo->fd->data_src = g_slist_append(pinfo->fd->data_src, next_tvb);
/* It's not fragmented. */
pinfo->fragmented = FALSE;
/* Save the current value of "pi", and adjust certain fields to
reflect the new tvbuff. */
save_pi = pi;
pi.compat_top_tvb = next_tvb;
pi.len = tvb_reported_length(next_tvb);
pi.captured_len = tvb_length(next_tvb);
must_restore_pi = TRUE;
} else {
/* We don't have the complete reassembled payload. */
next_tvb = NULL;
}
} else {
/* If this is the first fragment, dissect its contents, otherwise
just show it as a fragment.
XXX - if we eventually don't save the reassembled contents of all
fragmented datagrams, we may want to always reassemble. */
if (offlg & IP6F_OFF_MASK) {
/* Not the first fragment - don't dissect it. */
next_tvb = NULL;
} else {
/* First fragment, or not fragmented. Dissect what we have here. */
/* Get a tvbuff for the payload. */
next_tvb = tvb_new_subset(tvb, offset, -1, -1);
/*
* If this is the first fragment, but not the only fragment,
* tell the next protocol that.
*/
if (offlg & IP6F_MORE_FRAG)
pinfo->fragmented = TRUE;
else
pinfo->fragmented = FALSE;
}
}
if (next_tvb == NULL) {
/* Just show this as a fragment. */
/* COL_INFO was filled in by "dissect_frag6()" */
dissect_data(tvb, offset, pinfo, tree);
/* As we haven't reassembled anything, we haven't changed "pi", so
we don't have to restore it. */
return;
}
/* do lookup with the subdissector table */
if (!dissector_try_port(ip_dissector_table, nxt, next_tvb, pinfo, tree)) {
/* Unknown protocol */
if (check_col(pinfo->fd, COL_INFO))
col_add_fstr(pinfo->fd, COL_INFO, "%s (0x%02x)", ipprotostr(nxt),nxt);
dissect_data(next_tvb, 0, pinfo, tree);
}
}
static void
dissect_ipv6_none(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
if (hf_ipv6_mipv6_length != -1) {
if (check_col(pinfo->fd, COL_INFO))
col_add_fstr(pinfo->fd, COL_INFO, "MobileIPv6 Destination Option");
} else {
if (check_col(pinfo->fd, COL_INFO))
col_add_fstr(pinfo->fd, COL_INFO, "IPv6 no next header");
}
/* XXX - dissect the payload as padding? */
}
void
proto_register_ipv6(void)
{
static hf_register_info hf[] = {
{ &hf_ipv6_version,
{ "Version", "ipv6.version",
FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }},
{ &hf_ipv6_class,
{ "Traffic class", "ipv6.class",
FT_UINT8, BASE_HEX, NULL, 0x0, "", HFILL }},
{ &hf_ipv6_flow,
{ "Flowlabel", "ipv6.flow",
FT_UINT32, BASE_HEX, NULL, 0x0, "", HFILL }},
{ &hf_ipv6_plen,
{ "Payload length", "ipv6.plen",
FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL }},
{ &hf_ipv6_nxt,
{ "Next header", "ipv6.nxt",
FT_UINT8, BASE_HEX, NULL, 0x0, "", HFILL }},
{ &hf_ipv6_hlim,
{ "Hop limit", "ipv6.hlim",
FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }},
{ &hf_ipv6_src,
{ "Source", "ipv6.src",
FT_IPv6, BASE_NONE, NULL, 0x0,
"Source IPv6 Address", HFILL }},
{ &hf_ipv6_dst,
{ "Destination", "ipv6.dst",
FT_IPv6, BASE_NONE, NULL, 0x0,
"Destination IPv6 Address", HFILL }},
{ &hf_ipv6_addr,
{ "Address", "ipv6.addr",
FT_IPv6, BASE_NONE, NULL, 0x0,
"Source or Destination IPv6 Address", HFILL }},
{ &hf_ipv6_fragment_overlap,
{ "Fragment overlap", "ipv6.fragment.overlap",
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
"Fragment overlaps with other fragments", HFILL }},
{ &hf_ipv6_fragment_overlap_conflict,
{ "Conflicting data in fragment overlap", "ipv6.fragment.overlap.conflict",
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
"Overlapping fragments contained conflicting data", HFILL }},
{ &hf_ipv6_fragment_multiple_tails,
{ "Multiple tail fragments found", "ipv6.fragment.multipletails",
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
"Several tails were found when defragmenting the packet", HFILL }},
{ &hf_ipv6_fragment_too_long_fragment,
{ "Fragment too long", "ipv6.fragment.toolongfragment",
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
"Fragment contained data past end of packet", HFILL }},
{ &hf_ipv6_fragment_error,
{ "Defragmentation error", "ipv6.fragment.error",
FT_NONE, BASE_NONE, NULL, 0x0,
"Defragmentation error due to illegal fragments", HFILL }},
{ &hf_ipv6_fragment,
{ "IPv6 Fragment", "ipv6.fragment",
FT_NONE, BASE_NONE, NULL, 0x0,
"IPv6 Fragment", HFILL }},
{ &hf_ipv6_fragments,
{ "IPv6 Fragments", "ipv6.fragments",
FT_NONE, BASE_NONE, NULL, 0x0,
"IPv6 Fragments", HFILL }},
/* BT INSERT BEGIN */
{ &hf_ipv6_mipv6_type,
{ "Option Type ", "ipv6.mipv6_type",
FT_UINT8, BASE_DEC, NULL, 0x0,
"", HFILL }},
{ &hf_ipv6_mipv6_length,
{ "Option Length ", "ipv6.mipv6_length",
FT_UINT8, BASE_DEC, NULL, 0x0,
"", HFILL }},
{ &hf_ipv6_mipv6_a_flag,
{ "Acknowledge (A) ", "ipv6.mipv6_a_flag",
FT_BOOLEAN, 8, TFS(&ipv6_mipv6_bu_a_flag_value),
IP6_MIPv6_BU_A_FLAG,
"", HFILL }},
{ &hf_ipv6_mipv6_h_flag,
{ "Home Registration (H) ", "ipv6.mipv6_h_flag",
FT_BOOLEAN, 8, TFS(&ipv6_mipv6_bu_h_flag_value),
IP6_MIPv6_BU_H_FLAG,
"", HFILL }},
{ &hf_ipv6_mipv6_r_flag,
{ "Router (R) ", "ipv6.mipv6_r_flag",
FT_BOOLEAN, 8, TFS(&ipv6_mipv6_bu_r_flag_value),
IP6_MIPv6_BU_R_FLAG,
"", HFILL }},
{ &hf_ipv6_mipv6_d_flag,
{ "Duplicate Address Detection (D) ", "ipv6.mipv6_d_flag",
FT_BOOLEAN, 8, TFS(&ipv6_mipv6_bu_d_flag_value),
IP6_MIPv6_BU_D_FLAG,
"", HFILL }},
{ &hf_ipv6_mipv6_m_flag,
{ "MAP Registration (M) ", "ipv6.mipv6_m_flag",
FT_BOOLEAN, 8, TFS(&ipv6_mipv6_bu_m_flag_value),
IP6_MIPv6_BU_M_FLAG,
"", HFILL }},
{ &hf_ipv6_mipv6_b_flag,
{ "Bicasting all (B) ", "ipv6.mipv6_b_flag",
FT_BOOLEAN, 8, TFS(&ipv6_mipv6_bu_b_flag_value),
IP6_MIPv6_BU_B_FLAG,
"", HFILL }},
{ &hf_ipv6_mipv6_prefix_length,
{ "Prefix Length ", "ipv6.mipv6_prefix_length",
FT_UINT8, BASE_DEC, NULL, 0x0,
"", HFILL }},
{ &hf_ipv6_mipv6_sequence_number,
{ "Sequence Number ", "ipv6.mipv6_sequence_number",
FT_UINT16, BASE_DEC, NULL, 0x0,
"", HFILL }},
{ &hf_ipv6_mipv6_life_time,
{ "Life Time ", "ipv6.mipv6_life_time",
FT_UINT32, BASE_DEC, NULL, 0x0,
"", HFILL }},
{ &hf_ipv6_mipv6_status,
{ "Status ", "ipv6.mipv6_status",
FT_UINT8, BASE_DEC, NULL, 0x0,
"", HFILL }},
{ &hf_ipv6_mipv6_refresh,
{ "Refresh ", "ipv6.mipv6_refresh",
FT_UINT32, BASE_DEC, NULL, 0x0,
"", HFILL }},
{ &hf_ipv6_mipv6_home_address,
{ "Home Address ", "ipv6.mipv6_home_address",
FT_IPv6, BASE_HEX, NULL, 0x0,
"", HFILL }},
{ &hf_ipv6_mipv6_sub_type,
{ "Sub-Option Type ", "ipv6.mipv6_sub_type",
FT_UINT8, BASE_DEC, NULL, 0x0,
"", HFILL }},
{ &hf_ipv6_mipv6_sub_length,
{ "Sub-Option Length ", "ipv6.mipv6_sub_length",
FT_UINT8, BASE_DEC, NULL, 0x0,
"", HFILL }},
{ &hf_ipv6_mipv6_sub_unique_ID,
{ "Unique Identifier ", "ipv6.mipv6_sub_unique_ID",
FT_UINT16, BASE_DEC, NULL, 0x0,
"", HFILL }},
{ &hf_ipv6_mipv6_sub_alternative_COA,
{ "Alternative Care of Address ", "ipv6.mipv6_sub_alternative_COA",
FT_IPv6, BASE_HEX, NULL, 0x0,
"", HFILL }},
/* BT INSERT END */
#ifdef TEST_FINALHDR
{ &hf_ipv6_final,
{ "Final next header", "ipv6.final",
FT_UINT8, BASE_HEX, NULL, 0x0, "", HFILL }},
#endif
};
static gint *ett[] = {
&ett_ipv6,
&ett_ipv6_fragments,
&ett_ipv6_fragment,
};
module_t *ipv6_module;
proto_ipv6 = proto_register_protocol("Internet Protocol Version 6", "IPv6", "ipv6");
proto_register_field_array(proto_ipv6, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
/* Register configuration options */
ipv6_module = prefs_register_protocol(proto_ipv6, NULL);
prefs_register_bool_preference(ipv6_module, "defragment",
"Reassemble fragmented IPv6 datagrams",
"Whether fragmented IPv6 datagrams should be reassembled",
&ipv6_reassemble);
register_dissector("ipv6", dissect_ipv6, proto_ipv6);
register_init_routine(ipv6_reassemble_init);
}
void
proto_reg_handoff_ipv6(void)
{
dissector_add("ethertype", ETHERTYPE_IPv6, dissect_ipv6, proto_ipv6);
dissector_add("ppp.protocol", PPP_IPV6, dissect_ipv6, proto_ipv6);
dissector_add("ip.proto", IP_PROTO_IPV6, dissect_ipv6, proto_ipv6);
dissector_add("null.type", BSD_AF_INET6_BSD, dissect_ipv6, proto_ipv6);
dissector_add("null.type", BSD_AF_INET6_FREEBSD, dissect_ipv6, proto_ipv6);
dissector_add("ip.proto", IP_PROTO_NONE, dissect_ipv6_none, proto_ipv6);
}
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