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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 1.101 2004/01/21 08:39:29 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
#include <string.h>
#include <stdio.h>
#include <glib.h>
#include <epan/packet.h>
#include "packet-ipsec.h"
#include "packet-ipv6.h"
#include "ip_opts.h"
#include <epan/resolv.h>
#include "prefs.h"
#include "reassemble.h"
#include "ipproto.h"
#include "etypes.h"
#include "ppptypes.h"
#include "aftypes.h"
#include "nlpid.h"
#include "arcnet_pids.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_reassembled_in = -1;
static int hf_ipv6_mipv6_type = -1;
static int hf_ipv6_mipv6_length = -1;
static int hf_ipv6_mipv6_home_address = -1;
static gint ett_ipv6 = -1;
static gint ett_ipv6_fragments = -1;
static gint ett_ipv6_fragment = -1;
static const fragment_items ipv6_frag_items = {
&ett_ipv6_fragment,
&ett_ipv6_fragments,
&hf_ipv6_fragments,
&hf_ipv6_fragment,
&hf_ipv6_fragment_overlap,
&hf_ipv6_fragment_overlap_conflict,
&hf_ipv6_fragment_multiple_tails,
&hf_ipv6_fragment_too_long_fragment,
&hf_ipv6_fragment_error,
&hf_ipv6_reassembled_in,
"fragments"
};
static dissector_handle_t data_handle;
static dissector_table_t ip_dissector_table;
/* 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 GHashTable *ipv6_reassembled_table = NULL;
void
capture_ipv6(const guchar *pd, int offset, int len, packet_counts *ld)
{
guint8 nxt;
int advance;
if (!BYTES_ARE_IN_FRAME(offset, len, 4+4+16+16)) {
ld->other++;
return;
}
nxt = pd[offset+6]; /* get the "next header" value */
offset += 4+4+16+16; /* skip past the IPv6 header */
len -= 4+4+16+16;
again:
switch (nxt) {
case IP_PROTO_HOPOPTS:
case IP_PROTO_ROUTING:
case IP_PROTO_DSTOPTS:
if (!BYTES_ARE_IN_FRAME(offset, len, 2)) {
ld->other++;
return;
}
nxt = pd[offset];
advance = (pd[offset+1] + 1) << 3;
if (!BYTES_ARE_IN_FRAME(offset, len, advance)) {
ld->other++;
return;
}
offset += advance;
len -= advance;
goto again;
case IP_PROTO_FRAGMENT:
if (!BYTES_ARE_IN_FRAME(offset, len, 2)) {
ld->other++;
return;
}
nxt = pd[offset];
advance = 8;
if (!BYTES_ARE_IN_FRAME(offset, len, advance)) {
ld->other++;
return;
}
offset += advance;
len -= advance;
goto again;
case IP_PROTO_AH:
if (!BYTES_ARE_IN_FRAME(offset, len, 2)) {
ld->other++;
return;
}
nxt = pd[offset];
advance = 8 + ((pd[offset+1] - 1) << 2);
if (!BYTES_ARE_IN_FRAME(offset, len, advance)) {
ld->other++;
return;
}
offset += advance;
len -= advance;
goto again;
}
switch(nxt) {
case IP_PROTO_SCTP:
ld->sctp++;
break;
case IP_PROTO_TCP:
ld->tcp++;
break;
case IP_PROTO_UDP:
ld->udp++;
break;
case IP_PROTO_ICMP:
case IP_PROTO_ICMPV6: /* XXX - separate counters? */
ld->icmp++;
break;
case IP_PROTO_OSPF:
ld->ospf++;
break;
case IP_PROTO_GRE:
ld->gre++;
break;
case IP_PROTO_VINES:
ld->vines++;
break;
default:
ld->other++;
}
}
static void
ipv6_reassemble_init(void)
{
fragment_table_init(&ipv6_fragment_table);
reassembled_table_init(&ipv6_reassembled_table);
}
static int
dissect_routing6(tvbuff_t *tvb, int offset, proto_tree *tree) {
struct ip6_rthdr rt;
guint 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
);
}
}
if (rt.ip6r_type == 2) {
proto_tree_add_ipv6(rthdr_tree, hf_ipv6_mipv6_home_address,
tvb, offset + 8, 16,
tvb_get_ptr(tvb, offset + 8, 16));
}
}
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 = g_ntohs(frag.ip6f_offlg);
frag.ip6f_ident = g_ntohl(frag.ip6f_ident);
*offlg = frag.ip6f_offlg;
*ident = frag.ip6f_ident;
if (check_col(pinfo->cinfo, COL_INFO)) {
col_add_fstr(pinfo->cinfo, 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,
"Fragmentation 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;
}
static int
dissect_mipv6_hoa(tvbuff_t *tvb, proto_tree *dstopt_tree, int offset)
{
int len = 0;
proto_tree_add_uint_format(dstopt_tree, hf_ipv6_mipv6_type, tvb,
offset + len, 1,
tvb_get_guint8(tvb, offset + len),
"Option Type: %u (0x%02x) - Home Address Option",
tvb_get_guint8(tvb, offset + len),
tvb_get_guint8(tvb, offset + len));
len += 1;
proto_tree_add_uint(dstopt_tree, hf_ipv6_mipv6_length, tvb, offset + len,
1, tvb_get_guint8(tvb, offset + len));
len += 1;
proto_tree_add_ipv6(dstopt_tree, hf_ipv6_mipv6_home_address, tvb,
offset + len, 16, tvb_get_ptr(tvb, offset + len, 16));
len += 16;
return len;
}
static const value_string rtalertvals[] = {
{ IP6OPT_RTALERT_MLD, "MLD" },
{ IP6OPT_RTALERT_RSVP, "RSVP" },
{ 0, NULL },
};
/* Like "dissect_ip_tcp_options()", but assumes the length of an option
*doesn't* include the type and length bytes. */
void
dissect_ipv6_options(tvbuff_t *tvb, int offset, guint length,
const ip_tcp_opt *opttab, int nopts, int eol,
packet_info *pinfo, proto_tree *opt_tree)
{
guchar opt;
const ip_tcp_opt *optp;
opt_len_type len_type;
unsigned int optlen;
char *name;
char name_str[7+1+1+2+2+1+1]; /* "Unknown (0x%02x)" */
void (*dissect)(const struct ip_tcp_opt *, tvbuff_t *,
int, guint, packet_info *, proto_tree *);
guint len;
while (length > 0) {
opt = tvb_get_guint8(tvb, offset);
for (optp = &opttab[0]; optp < &opttab[nopts]; optp++) {
if (optp->optcode == opt)
break;
}
if (optp == &opttab[nopts]) {
/* We assume that the only NO_LENGTH options are Pad1 options,
so that we can treat unknown options as VARIABLE_LENGTH with a
minimum of 0, and at least be able to move on to the next option
by using the length in the option. */
optp = NULL; /* indicate that we don't know this option */
len_type = VARIABLE_LENGTH;
optlen = 0;
snprintf(name_str, sizeof name_str, "Unknown (0x%02x)", opt);
name = name_str;
dissect = NULL;
} else {
len_type = optp->len_type;
optlen = optp->optlen;
name = optp->name;
dissect = optp->dissect;
}
--length; /* account for type byte */
if (len_type != NO_LENGTH) {
/* Option has a length. Is it in the packet? */
if (length == 0) {
/* Bogus - packet must at least include option code byte and
length byte! */
proto_tree_add_text(opt_tree, tvb, offset, 1,
"%s (length byte past end of options)", name);
return;
}
len = tvb_get_guint8(tvb, offset + 1); /* total including type, len */
--length; /* account for length byte */
if (len > length) {
/* Bogus - option goes past the end of the header. */
proto_tree_add_text(opt_tree, tvb, offset, length,
"%s (option length = %u byte%s says option goes past end of options)",
name, len, plurality(len, "", "s"));
return;
} else if (len_type == FIXED_LENGTH && len != optlen) {
/* Bogus - option length isn't what it's supposed to be for this
option. */
proto_tree_add_text(opt_tree, tvb, offset, 2 + len,
"%s (with option length = %u byte%s; should be %u)", name,
len, plurality(len, "", "s"), optlen);
return;
} else if (len_type == VARIABLE_LENGTH && len < optlen) {
/* Bogus - option length is less than what it's supposed to be for
this option. */
proto_tree_add_text(opt_tree, tvb, offset, 2 + len,
"%s (with option length = %u byte%s; should be >= %u)", name,
len, plurality(len, "", "s"), optlen);
return;
} else {
if (optp == NULL) {
proto_tree_add_text(opt_tree, tvb, offset, 2 + len, "%s (%u byte%s)",
name, len, plurality(len, "", "s"));
} else {
if (dissect != NULL) {
/* Option has a dissector. */
(*dissect)(optp, tvb, offset, 2 + len, pinfo, opt_tree);
} else {
/* Option has no data, hence no dissector. */
proto_tree_add_text(opt_tree, tvb, offset, 2 + len, "%s", name);
}
}
offset += 2 + len;
}
length -= len;
} else {
proto_tree_add_text(opt_tree, tvb, offset, 1, "%s", name);
offset += 1;
}
if (opt == eol)
break;
}
}
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_HOME_ADDRESS:
delta = dissect_mipv6_hoa(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 hopopts, routing, frag, ah, dstopts;
guint16 offlg;
guint32 ident;
int offset;
fragment_data *ipfd_head;
tvbuff_t *next_tvb;
gboolean update_col_info = TRUE;
gboolean save_fragmented;
struct ip6_hdr ipv6;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "IPv6");
if (check_col(pinfo->cinfo, COL_INFO))
col_clear(pinfo->cinfo, 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 = g_ntohs(ipv6.ip6_plen);
/* Adjust the length of this tvbuff to include only the IPv6 datagram. */
set_actual_length(tvb, 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)((g_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)(g_ntohl(ipv6.ip6_flow) & IPV6_FLOWLABEL_MASK),
"Flowlabel: 0x%05lx",
(unsigned long)(g_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, and has none of the other
non-final headers */
hopopts = FALSE;
routing = FALSE;
frag = FALSE;
ah = FALSE;
dstopts = FALSE;
again:
switch (nxt) {
case IP_PROTO_HOPOPTS:
hopopts = TRUE;
advance = dissect_hopopts(tvb, offset, tree);
nxt = tvb_get_guint8(tvb, offset);
poffset = offset;
offset += advance;
plen -= advance;
goto again;
case IP_PROTO_ROUTING:
routing = TRUE;
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:
ah = TRUE;
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:
dstopts = TRUE;
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, this is a fragment, and we have all the data
* in the fragment, then just add the fragment to the hashtable.
*/
save_fragmented = pinfo->fragmented;
if (ipv6_reassemble && frag && tvb_bytes_exist(tvb, offset, plen)) {
ipfd_head = fragment_add_check(tvb, offset, pinfo, ident,
ipv6_fragment_table,
ipv6_reassembled_table,
offlg & IP6F_OFF_MASK,
plen,
offlg & IP6F_MORE_FRAG);
next_tvb = process_reassembled_data(tvb, offset, pinfo, "Reassembled IPv6",
ipfd_head, &ipv6_frag_items, &update_col_info, ipv6_tree);
} 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()" */
call_dissector(data_handle, tvb_new_subset(tvb, offset, -1, -1), pinfo, tree);
/* As we haven't reassembled anything, we haven't changed "pi", so
we don't have to restore it. */
pinfo->fragmented = save_fragmented;
return;
}
/* do lookup with the subdissector table */
if (!dissector_try_port(ip_dissector_table, nxt, next_tvb, pinfo, tree)) {
/* Unknown protocol.
Handle "no next header" specially. */
if (nxt == IP_PROTO_NONE) {
if (check_col(pinfo->cinfo, COL_INFO)) {
/* If we had an Authentication Header, the AH dissector already
put something in the Info column; leave it there. */
if (!ah) {
if (hopopts || routing || dstopts) {
char *sep = "IPv6 ";
if (hopopts) {
col_append_fstr(pinfo->cinfo, COL_INFO, "%shop-by-hop options",
sep);
sep = ", ";
}
if (routing) {
col_append_fstr(pinfo->cinfo, COL_INFO, "%srouting", sep);
sep = ", ";
}
if (dstopts) {
col_append_fstr(pinfo->cinfo, COL_INFO, "%sdestination options",
sep);
}
} else
col_set_str(pinfo->cinfo, COL_INFO, "IPv6 no next header");
}
}
} else {
if (check_col(pinfo->cinfo, COL_INFO))
col_add_fstr(pinfo->cinfo, COL_INFO, "%s (0x%02x)", ipprotostr(nxt),nxt);
}
call_dissector(data_handle, next_tvb, pinfo, tree);
}
pinfo->fragmented = save_fragmented;
}
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_FRAMENUM, BASE_NONE, NULL, 0x0,
"Defragmentation error due to illegal fragments", HFILL }},
{ &hf_ipv6_fragment,
{ "IPv6 Fragment", "ipv6.fragment",
FT_FRAMENUM, BASE_NONE, NULL, 0x0,
"IPv6 Fragment", HFILL }},
{ &hf_ipv6_fragments,
{ "IPv6 Fragments", "ipv6.fragments",
FT_NONE, BASE_NONE, NULL, 0x0,
"IPv6 Fragments", HFILL }},
{ &hf_ipv6_reassembled_in,
{ "Reassembled IPv6 in frame", "ipv6.reassembled_in",
FT_FRAMENUM, BASE_NONE, NULL, 0x0,
"This IPv6 packet is reassembled in this frame", HFILL }},
/* Mobile IPv6 */
{ &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_home_address,
{ "Home Address ", "ipv6.mipv6_home_address",
FT_IPv6, BASE_HEX, NULL, 0x0,
"", HFILL }},
#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_handle_t ipv6_handle;
data_handle = find_dissector("data");
ipv6_handle = find_dissector("ipv6");
dissector_add("ethertype", ETHERTYPE_IPv6, ipv6_handle);
dissector_add("ppp.protocol", PPP_IPV6, ipv6_handle);
dissector_add("ppp.protocol", ETHERTYPE_IPv6, ipv6_handle);
dissector_add("gre.proto", ETHERTYPE_IPv6, ipv6_handle);
dissector_add("ip.proto", IP_PROTO_IPV6, ipv6_handle);
dissector_add("null.type", BSD_AF_INET6_BSD, ipv6_handle);
dissector_add("null.type", BSD_AF_INET6_FREEBSD, ipv6_handle);
dissector_add("null.type", BSD_AF_INET6_DARWIN, ipv6_handle);
dissector_add("chdlctype", ETHERTYPE_IPv6, ipv6_handle);
dissector_add("fr.ietf", NLPID_IP6, ipv6_handle);
dissector_add("x.25.spi", NLPID_IP6, ipv6_handle);
dissector_add("arcnet.protocol_id", ARCNET_PROTO_IPv6, ipv6_handle);
ip_dissector_table = find_dissector_table("ip.proto");
}
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