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wireshark/epan/dissectors/packet-shim6.c

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/* packet-shim6.c
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* SHIM6 support added by Matthijs Mekking <matthijs@NLnetLabs.nl>
*/
#include "config.h"
#include <glib.h>
#include <epan/packet.h>
#include <epan/expert.h>
#include <epan/proto_data.h>
#include <epan/in_cksum.h>
#include <epan/ipproto.h>
#include "packet-ipv6.h"
void proto_register_shim6(void);
void proto_reg_handoff_shim6(void);
/* SHIM6 header */
struct ip6_shim {
guint8 ip6s_nxt; /* next header */
guint8 ip6s_len; /* header extension length */
guint8 ip6s_p; /* P field and first 7 bits of remainder */
/* followed by shim6 specific data*/
};
/* SHIM6 control message types */
#define SHIM6_TYPE_I1 0x01 /* 0 000 0001 */
#define SHIM6_TYPE_R1 0x02 /* 0 000 0010 */
#define SHIM6_TYPE_I2 0x03 /* 0 000 0011 */
#define SHIM6_TYPE_R2 0x04 /* 0 000 0100 */
#define SHIM6_TYPE_R1BIS 0x05 /* 0 000 0101 */
#define SHIM6_TYPE_I2BIS 0x06 /* 0 000 0110 */
#define SHIM6_TYPE_UPD_REQ 0x40 /* 0 100 0000 = 64 */
#define SHIM6_TYPE_UPD_ACK 0x41 /* 0 100 0001 = 65 */
#define SHIM6_TYPE_KEEPALIVE 0x42 /* 0 100 0010 = 66 */
#define SHIM6_TYPE_PROBE 0x43 /* 0 100 0011 = 67 */
/* SHIM6 Options */
#define SHIM6_OPT_RESPVAL 0x01 /* 0 000 0001 */
#define SHIM6_OPT_LOCLIST 0x02 /* 0 000 0010 */
#define SHIM6_OPT_LOCPREF 0x03 /* 0 000 0011 */
#define SHIM6_OPT_CGAPDM 0x04 /* 0 000 0100 */
#define SHIM6_OPT_CGASIG 0x05 /* 0 000 0101 */
#define SHIM6_OPT_ULIDPAIR 0x06 /* 0 000 0110 */
#define SHIM6_OPT_FII 0x07 /* 0 000 0111 */
/* SHIM6 Bitmasks */
#define SHIM6_BITMASK_P 0x80 /* 1 000 0000 */
#define SHIM6_BITMASK_TYPE 0x7F /* 0 111 1111 */
#define SHIM6_BITMASK_PROTOCOL 0x01 /* 0 000 0001 */
#define SHIM6_BITMASK_SPECIFIC 0xFE /* 1 111 1110 */
#define SHIM6_BITMASK_R 0x80 /* 1 000 0000 */
#define SHIM6_BITMASK_CT 0x7F /* 0 111 1111 */
#define SHIM6_BITMASK_OPT_TYPE 0xFFFE /* 1 111 1111 1 111 1110 */
#define SHIM6_BITMASK_CRITICAL 0x01 /* 0 000 0001 */
#define SHIM6_BITMASK_PRECVD 0xF0 /* 1 111 0000 */
#define SHIM6_BITMASK_PSENT 0x0F /* 0 000 1111 */
#define SHIM6_BITMASK_STA 0xC0 /* 1 100 0000 */
/* SHIM6 Verification Methods */
#define SHIM6_VERIF_HBA 0x01 /* 0 000 0001 */
#define SHIM6_VERIF_CGA 0x02 /* 0 000 0010 */
/* SHIM6 Flags */
#define SHIM6_FLAG_BROKEN 0x01 /* 0 000 0001 */
#define SHIM6_FLAG_TEMPORARY 0x02 /* 0 000 0010 */
/* SHIM6 REAP States */
#define SHIM6_REAP_OPERATIONAL 0x00 /* 0 000 0000 */
#define SHIM6_REAP_EXPLORING 0x01 /* 0 000 0001 */
#define SHIM6_REAP_INBOUNDOK 0x02 /* 0 000 0010 */
static int proto_shim6 = -1;
static int hf_shim6_nxt = -1;
static int hf_shim6_len = -1;
static int hf_shim6_len_oct = -1;
static int hf_shim6_p = -1;
/* context tag is 49 bits, cannot be used for filter yet */
static int hf_shim6_ct = -1;
static int hf_shim6_type = -1;
static int hf_shim6_proto = -1;
static int hf_shim6_checksum = -1;
static int hf_shim6_checksum_status= -1;
static int hf_shim6_inonce = -1; /* also for request nonce */
static int hf_shim6_rnonce = -1;
static int hf_shim6_reserved = -1;
static int hf_shim6_reserved2 = -1;
static int hf_shim6_precvd = -1;
static int hf_shim6_psent = -1;
static int hf_shim6_psrc = -1;
static int hf_shim6_pdst = -1;
static int hf_shim6_pnonce = -1;
static int hf_shim6_pdata = -1;
static int hf_shim6_sulid = -1;
static int hf_shim6_rulid = -1;
static int hf_shim6_reap = -1;
static int hf_shim6_opt_type = -1;
static int hf_shim6_opt_len = -1;
static int hf_shim6_opt_total_len = -1;
static int hf_shim6_opt_loc_verif_methods = -1;
static int hf_shim6_opt_critical = -1;
static int hf_shim6_opt_loclist = -1;
static int hf_shim6_locator = -1;
static int hf_shim6_loc_flag = -1;
static int hf_shim6_loc_prio = -1;
static int hf_shim6_loc_weight = -1;
static int hf_shim6_opt_locnum = -1;
static int hf_shim6_opt_elemlen = -1;
static int hf_shim6_opt_fii = -1;
static int hf_shim6_validator = -1;
static int hf_shim6_cga_parameter_data_structure = -1;
static int hf_shim6_cga_signature = -1;
static int hf_shim6_padding = -1;
static gint ett_shim6_proto = -1;
static gint ett_shim6_option = -1;
static gint ett_shim6_locators = -1;
static gint ett_shim6_verif_methods = -1;
static gint ett_shim6_loc_pref = -1;
static gint ett_shim6_probes_sent = -1;
static gint ett_shim6_probe_sent = -1;
static gint ett_shim6_probes_rcvd = -1;
static gint ett_shim6_probe_rcvd = -1;
static gint ett_shim6_cksum = -1;
static expert_field ei_shim6_opt_elemlen_invalid = EI_INIT;
static expert_field ei_shim6_checksum_bad = EI_INIT;
static guint16
shim6_checksum(tvbuff_t *tvb, int offset, int len)
{
vec_t cksum_vec[1];
SET_CKSUM_VEC_TVB(cksum_vec[0], tvb, offset, len);
return in_cksum(&cksum_vec[0], 1);
}
static const value_string shimoptvals[] = {
{ SHIM6_OPT_RESPVAL, "Responder Validator Option" },
{ SHIM6_OPT_LOCLIST, "Locator List Option" },
{ SHIM6_OPT_LOCPREF, "Locator Preferences Option" },
{ SHIM6_OPT_CGAPDM, "CGA Parameter Data Structure Option" },
{ SHIM6_OPT_CGASIG, "CGA Signature Option" },
{ SHIM6_OPT_ULIDPAIR, "ULID Pair Option" },
{ SHIM6_OPT_FII, "Forked Instance Identifier Option" },
{ 0, NULL }
};
static const value_string shimverifmethods[] = {
{ SHIM6_VERIF_HBA, "HBA" },
{ SHIM6_VERIF_CGA, "CGA" },
{ 0, NULL }
};
static const value_string shimflags[] _U_ = {
{ SHIM6_FLAG_BROKEN, "BROKEN" },
{ SHIM6_FLAG_TEMPORARY, "TEMPORARY" },
{ 0, NULL }
};
static const value_string shimreapstates[] = {
{ SHIM6_REAP_OPERATIONAL, "Operational" },
{ SHIM6_REAP_EXPLORING, "Exploring" },
{ SHIM6_REAP_INBOUNDOK, "InboundOK" },
{ 0, NULL }
};
static const value_string shim6_protocol[] = {
{ 0, "SHIM6" },
{ 1, "HIP" },
{ 0, NULL }
};
static void
dissect_shim6_opt_loclist(proto_tree * opt_tree, tvbuff_t * tvb, gint *offset)
{
proto_tree *subtree;
guint count;
guint optlen;
int p = *offset;
proto_tree_add_item(opt_tree, hf_shim6_opt_loclist, tvb, p, 4, ENC_BIG_ENDIAN);
p += 4;
optlen = tvb_get_guint8(tvb, p);
proto_tree_add_item(opt_tree, hf_shim6_opt_locnum, tvb, p, 1, ENC_BIG_ENDIAN);
p++;
/* Verification Methods */
subtree = proto_tree_add_subtree(opt_tree, tvb, p, optlen,
ett_shim6_verif_methods, NULL, "Locator Verification Methods");
for (count=0; count < optlen; count++)
proto_tree_add_item(subtree, hf_shim6_opt_loc_verif_methods, tvb,
p+count, 1, ENC_BIG_ENDIAN);
p += optlen;
/* Padding, included in length field */
if ((7 - optlen % 8) > 0) {
proto_tree_add_item(opt_tree, hf_shim6_padding, tvb, p, (7 - optlen % 8), ENC_NA);
p += (7 - optlen % 8);
}
/* Locators */
subtree = proto_tree_add_subtree(opt_tree, tvb, p, 16 * optlen, ett_shim6_locators, NULL, "Locators");
for (count=0; count < optlen; count++) {
proto_tree_add_item(subtree, hf_shim6_locator, tvb, p, 16, ENC_NA);
p += 16;
}
*offset = p;
}
static void
dissect_shim6_opt_loc_pref(proto_tree * opt_tree, tvbuff_t * tvb, gint *offset, gint len, packet_info *pinfo)
{
proto_tree *subtree;
gint p;
gint optlen;
gint count;
p = *offset;
proto_tree_add_item(opt_tree, hf_shim6_opt_loclist, tvb, p, 4, ENC_BIG_ENDIAN);
p += 4;
optlen = tvb_get_guint8(tvb, p);
proto_tree_add_item(opt_tree, hf_shim6_opt_elemlen, tvb, p, 1, ENC_BIG_ENDIAN);
if (optlen < 1 || optlen > 3) {
proto_tree_add_expert_format(opt_tree, pinfo, &ei_shim6_opt_elemlen_invalid, tvb, p, 1,
"Invalid element length: %u", optlen);
return;
}
p++;
/* Locator Preferences */
count = 1;
while (p < len) {
subtree = proto_tree_add_subtree_format(opt_tree, tvb, p, optlen, ett_shim6_loc_pref, NULL,
"Locator Preferences %u", count);
/* Flags */
if (optlen >= 1)
proto_tree_add_item(subtree, hf_shim6_loc_flag, tvb, p, 1, ENC_BIG_ENDIAN);
/* Priority */
if (optlen >= 2)
proto_tree_add_item(subtree, hf_shim6_loc_prio, tvb, p+1, 1, ENC_BIG_ENDIAN);
/* Weight */
if (optlen >= 3)
proto_tree_add_item(subtree, hf_shim6_loc_weight, tvb, p+2, 1, ENC_BIG_ENDIAN);
/*
* Shim6 Draft 08 doesn't specify the format when the Element length is
* more than three, except that any such formats MUST be defined so that
* the first three octets are the same as in the above case, that is, a
* of a 1 octet flags field followed by a 1 octet priority field, and a
* 1 octet weight field.
*/
p += optlen;
count++;
}
*offset = p;
}
static int
dissect_shimopts(tvbuff_t *tvb, int offset, proto_tree *tree, packet_info *pinfo)
{
int len, total_len;
gint p;
gint padding;
proto_tree *opt_tree;
proto_item *ti;
p = offset;
p += 4;
len = tvb_get_ntohs(tvb, offset+2);
padding = 7 - ((len + 3) % 8);
total_len = 4 + len + padding;
if (tree)
{
/* Option Type */
opt_tree = proto_tree_add_subtree(tree, tvb, offset, total_len, ett_shim6_option, NULL,
val_to_str_const( (tvb_get_ntohs(tvb, offset) & SHIM6_BITMASK_OPT_TYPE) >> 1, shimoptvals, "Unknown Option Type"));
proto_tree_add_item(opt_tree, hf_shim6_opt_type, tvb, offset, 2, ENC_BIG_ENDIAN);
/* Critical */
proto_tree_add_item(opt_tree, hf_shim6_opt_critical, tvb, offset+1, 1, ENC_BIG_ENDIAN);
/* Content Length */
proto_tree_add_item(opt_tree, hf_shim6_opt_len, tvb, offset + 2, 2, ENC_BIG_ENDIAN);
ti = proto_tree_add_uint(opt_tree, hf_shim6_opt_total_len, tvb, offset+2, 2, total_len);
PROTO_ITEM_SET_GENERATED(ti);
/* Option Type Specific */
switch (tvb_get_ntohs(tvb, offset) >> 1)
{
case SHIM6_OPT_RESPVAL:
proto_tree_add_item(opt_tree, hf_shim6_validator, tvb, p, len, ENC_NA);
p += len;
if (total_len-(len+4) > 0)
proto_tree_add_item(opt_tree, hf_shim6_padding, tvb, p, total_len-(len+4), ENC_NA);
break;
case SHIM6_OPT_LOCLIST:
dissect_shim6_opt_loclist(opt_tree, tvb, &p);
break;
case SHIM6_OPT_LOCPREF:
dissect_shim6_opt_loc_pref(opt_tree, tvb, &p, offset+len+4, pinfo);
if (total_len-(len+4) > 0)
proto_tree_add_item(opt_tree, hf_shim6_padding, tvb, p, total_len-(len+4), ENC_NA);
break;
case SHIM6_OPT_CGAPDM:
proto_tree_add_item(opt_tree, hf_shim6_cga_parameter_data_structure, tvb, p, len, ENC_NA);
p += len;
if (total_len-(len+4) > 0)
proto_tree_add_item(opt_tree, hf_shim6_padding, tvb, p, total_len-(len+4), ENC_NA);
break;
case SHIM6_OPT_CGASIG:
proto_tree_add_item(opt_tree, hf_shim6_cga_signature, tvb, p, len, ENC_NA);
p += len;
if (total_len-(len+4) > 0)
proto_tree_add_item(opt_tree, hf_shim6_padding, tvb, p, total_len-(len+4), ENC_NA);
break;
case SHIM6_OPT_ULIDPAIR:
proto_tree_add_item(opt_tree, hf_shim6_reserved, tvb, p, 4, ENC_NA);
p += 4;
proto_tree_add_item(opt_tree, hf_shim6_sulid, tvb, p, 16, ENC_NA);
p += 16;
proto_tree_add_item(opt_tree, hf_shim6_rulid, tvb, p, 16, ENC_NA);
p += 16;
break;
case SHIM6_OPT_FII:
proto_tree_add_item(opt_tree, hf_shim6_opt_fii, tvb, p, 4, ENC_BIG_ENDIAN);
p += 4;
break;
default:
break;
}
}
return total_len;
}
static void
dissect_shim6_ct(proto_tree * shim_tree, gint hf_item, tvbuff_t * tvb, gint offset, const guchar * label)
{
guint8 tmp[6];
guchar *ct_str;
tmp[0] = tvb_get_guint8(tvb, offset++);
tmp[1] = tvb_get_guint8(tvb, offset++);
tmp[2] = tvb_get_guint8(tvb, offset++);
tmp[3] = tvb_get_guint8(tvb, offset++);
tmp[4] = tvb_get_guint8(tvb, offset++);
tmp[5] = tvb_get_guint8(tvb, offset++);
ct_str = wmem_strdup_printf(wmem_packet_scope(),
"%s: %02X %02X %02X %02X %02X %02X", label,
tmp[0] & SHIM6_BITMASK_CT, tmp[1], tmp[2],
tmp[3], tmp[4], tmp[5]
);
proto_tree_add_none_format(shim_tree, hf_item, tvb, offset - 6, 6, "%s", ct_str);
}
static void
dissect_shim6_probes(proto_tree * shim_tree, tvbuff_t * tvb, gint offset,
const guchar * label, guint nbr_probe,
gboolean probes_rcvd)
{
proto_tree *probes_tree;
proto_tree *probe_tree;
gint ett_probes;
gint ett_probe;
guint count;
if (probes_rcvd) {
ett_probes = ett_shim6_probes_rcvd;
ett_probe = ett_shim6_probe_rcvd;
} else {
ett_probes = ett_shim6_probes_sent;
ett_probe = ett_shim6_probe_sent;
}
probes_tree = proto_tree_add_subtree(shim_tree, tvb, offset, 40 * nbr_probe, ett_probes, NULL, label);
for (count=0; count < nbr_probe; count++) {
probe_tree = proto_tree_add_subtree_format(probes_tree, tvb, offset, 40,
ett_probe, NULL, "Probe %u", count+1);
proto_tree_add_item(probe_tree, hf_shim6_psrc, tvb, offset, 16, ENC_NA);
offset += 16;
proto_tree_add_item(probe_tree, hf_shim6_pdst, tvb, offset, 16, ENC_NA);
offset += 16;
proto_tree_add_item(probe_tree, hf_shim6_pnonce, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
proto_tree_add_item(probe_tree, hf_shim6_pdata, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
}
}
/* Dissect SHIM6 data: control messages */
static int
dissect_shimctrl(tvbuff_t *tvb, gint offset, guint type, proto_tree *shim_tree)
{
gint p;
guint8 tmp;
const gchar *sta;
guint probes_sent;
guint probes_rcvd;
p = offset;
switch (type)
{
case SHIM6_TYPE_I1:
dissect_shim6_ct(shim_tree, hf_shim6_ct, tvb, p, "Initiator Context Tag");
p += 6;
proto_tree_add_item(shim_tree, hf_shim6_inonce, tvb, p, 4, ENC_BIG_ENDIAN);
p += 4;
break;
case SHIM6_TYPE_R1:
proto_tree_add_item(shim_tree, hf_shim6_reserved2, tvb, p, 2, ENC_NA);
p += 2;
proto_tree_add_item(shim_tree, hf_shim6_inonce, tvb, p, 4, ENC_BIG_ENDIAN);
p += 4;
proto_tree_add_item(shim_tree, hf_shim6_rnonce, tvb, p, 4, ENC_BIG_ENDIAN);
p += 4;
break;
case SHIM6_TYPE_I2:
dissect_shim6_ct(shim_tree, hf_shim6_ct, tvb, p, "Initiator Context Tag");
p += 6;
proto_tree_add_item(shim_tree, hf_shim6_inonce, tvb, p, 4, ENC_BIG_ENDIAN);
p += 4;
proto_tree_add_item(shim_tree, hf_shim6_rnonce, tvb, p, 4, ENC_BIG_ENDIAN);
p += 4;
proto_tree_add_item(shim_tree, hf_shim6_reserved2, tvb, p, 4, ENC_NA);
p += 4;
break;
case SHIM6_TYPE_R2:
dissect_shim6_ct(shim_tree, hf_shim6_ct, tvb, p, "Responder Context Tag");
p += 6;
proto_tree_add_item(shim_tree, hf_shim6_inonce, tvb, p, 4, ENC_BIG_ENDIAN);
p += 4;
break;
case SHIM6_TYPE_R1BIS:
dissect_shim6_ct(shim_tree, hf_shim6_ct, tvb, p, "Packet Context Tag");
p += 6;
proto_tree_add_item(shim_tree, hf_shim6_rnonce, tvb, p, 4, ENC_BIG_ENDIAN);
p += 4;
break;
case SHIM6_TYPE_I2BIS:
dissect_shim6_ct(shim_tree, hf_shim6_ct, tvb, p, "Initiator Context Tag");
p += 6;
proto_tree_add_item(shim_tree, hf_shim6_inonce, tvb, p, 4, ENC_BIG_ENDIAN);
p += 4;
proto_tree_add_item(shim_tree, hf_shim6_rnonce, tvb, p, 4, ENC_BIG_ENDIAN);
p += 4;
proto_tree_add_item(shim_tree, hf_shim6_reserved2, tvb, p, 6, ENC_NA);
p += 6;
dissect_shim6_ct(shim_tree, hf_shim6_ct, tvb, p, "Initiator Context Tag");
p += 6;
break;
case SHIM6_TYPE_UPD_REQ:
case SHIM6_TYPE_UPD_ACK:
dissect_shim6_ct(shim_tree, hf_shim6_ct, tvb, p, "Receiver Context Tag");
p += 6;
proto_tree_add_item(shim_tree, hf_shim6_rnonce, tvb, p, 4, ENC_BIG_ENDIAN);
p += 4;
break;
case SHIM6_TYPE_KEEPALIVE:
dissect_shim6_ct(shim_tree, hf_shim6_ct, tvb, p, "Receiver Context Tag");
p += 6;
proto_tree_add_item(shim_tree, hf_shim6_reserved2, tvb, p, 4, ENC_NA);
p += 4;
break;
case SHIM6_TYPE_PROBE:
dissect_shim6_ct(shim_tree, hf_shim6_ct, tvb, p, "Receiver Context Tag");
p += 6;
tmp = tvb_get_guint8(tvb, p);
probes_sent = tmp & SHIM6_BITMASK_PSENT;
probes_rcvd = (tmp & SHIM6_BITMASK_PRECVD) >> 4;
proto_tree_add_item(shim_tree, hf_shim6_psent, tvb,
p, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(shim_tree, hf_shim6_precvd, tvb,
p, 1, ENC_BIG_ENDIAN);
p++;
sta = val_to_str_const((tvb_get_guint8(tvb, p) & SHIM6_BITMASK_STA) >> 6,
shimreapstates, "Unknown REAP State");
proto_tree_add_uint_format_value(shim_tree, hf_shim6_reap, tvb,
p, 1, (tvb_get_guint8(tvb, p) & SHIM6_BITMASK_STA) >> 6,
"%s", sta);
proto_tree_add_item(shim_tree, hf_shim6_reserved2, tvb, p, 3, ENC_NA);
p += 3;
/* Probes Sent */
if (probes_sent) {
dissect_shim6_probes(shim_tree, tvb, p, "Probes Sent",
probes_sent, FALSE);
p += 40 * probes_sent;
}
/* Probes Received */
if (probes_rcvd) {
dissect_shim6_probes(shim_tree, tvb, p, "Probes Received",
probes_rcvd, TRUE);
p += 40 * probes_rcvd;
}
break;
default:
break;
}
return p-offset;
}
/* Dissect SHIM6 data: payload, common part, options */
static const value_string shimctrlvals[] = {
{ SHIM6_TYPE_I1, "I1" },
{ SHIM6_TYPE_R1, "R1" },
{ SHIM6_TYPE_I2, "I2" },
{ SHIM6_TYPE_R2, "R2" },
{ SHIM6_TYPE_R1BIS, "R1bis" },
{ SHIM6_TYPE_I2BIS, "I2bis" },
{ SHIM6_TYPE_UPD_REQ, "Update Request" },
{ SHIM6_TYPE_UPD_ACK, "Update Acknowledgment" },
{ SHIM6_TYPE_KEEPALIVE, "Keepalive" },
{ SHIM6_TYPE_PROBE, "Probe" },
{ 0, NULL }
};
static int
dissect_shim6(tvbuff_t *tvb, packet_info * pinfo, proto_tree *tree, void* data _U_)
{
struct ip6_shim shim;
int offset = 0, len;
gint p;
proto_tree *shim_tree;
proto_item *ti, *ti_len;
guint8 tmp[5];
tvb_memcpy(tvb, (guint8 *)&shim, offset, sizeof(shim));
len = (shim.ip6s_len + 1) << 3;
if (shim.ip6s_p & SHIM6_BITMASK_P) {
col_append_sep_str(pinfo->cinfo, COL_INFO, " , ", "Shim6 (Payload)");
}
else {
col_append_sep_fstr(pinfo->cinfo, COL_INFO, " , ", "Shim6 (%s)",
val_to_str_const(shim.ip6s_p & SHIM6_BITMASK_TYPE, shimctrlvals, "Unknown"));
}
ti = proto_tree_add_item(tree, proto_shim6, tvb, offset, len, ENC_NA);
shim_tree = proto_item_add_subtree(ti, ett_shim6_proto);
/* Next Header */
proto_tree_add_uint_format_value(shim_tree, hf_shim6_nxt, tvb,
offset + (int)offsetof(struct ip6_shim, ip6s_nxt), 1, shim.ip6s_nxt,
"%s (%u)", ipprotostr(shim.ip6s_nxt), shim.ip6s_nxt);
/* Header Extension Length */
ti_len = proto_tree_add_item(shim_tree, hf_shim6_len, tvb, offset, 1, ENC_BIG_ENDIAN);
ti = proto_tree_add_uint(shim_tree, hf_shim6_len_oct, tvb, offset, 1, len);
proto_item_append_text(ti, " bytes");
PROTO_ITEM_SET_GENERATED(ti);
PROTO_ITEM_SET_HIDDEN(ti);
proto_item_append_text(ti_len, " (%d bytes)", len);
/* P Field */
proto_tree_add_item(shim_tree, hf_shim6_p, tvb,
offset + (int)offsetof(struct ip6_shim, ip6s_p), 1, ENC_BIG_ENDIAN);
/* skip the first 2 bytes (nxt hdr, hdr ext len, p+7bits) */
p = offset + 3;
if (shim.ip6s_p & SHIM6_BITMASK_P) {
tmp[0] = tvb_get_guint8(tvb, p++);
tmp[1] = tvb_get_guint8(tvb, p++);
tmp[2] = tvb_get_guint8(tvb, p++);
tmp[3] = tvb_get_guint8(tvb, p++);
tmp[4] = tvb_get_guint8(tvb, p++);
/* Payload Extension Header */
proto_tree_add_none_format(shim_tree, hf_shim6_ct, tvb,
offset + (int)offsetof(struct ip6_shim, ip6s_p), 6,
"Receiver Context Tag: %02x %02x %02x %02x %02x %02x",
shim.ip6s_p & SHIM6_BITMASK_CT, tmp[0], tmp[1], tmp[2], tmp[3], tmp[4]);
} else {
/* Control Message */
guint16 csum;
int advance;
/* Message Type */
proto_tree_add_item(shim_tree, hf_shim6_type, tvb,
offset + (int)offsetof(struct ip6_shim, ip6s_p), 1,
ENC_BIG_ENDIAN
);
/* Protocol bit (Must be zero for SHIM6) */
proto_tree_add_item(shim_tree, hf_shim6_proto, tvb, p, 1, ENC_BIG_ENDIAN);
p++;
/* Checksum */
csum = shim6_checksum(tvb, offset, len);
proto_tree_add_checksum(shim_tree, tvb, p, hf_shim6_checksum, hf_shim6_checksum_status, &ei_shim6_checksum_bad, pinfo, csum,
ENC_BIG_ENDIAN, PROTO_CHECKSUM_VERIFY|PROTO_CHECKSUM_IN_CKSUM);
if (csum != 0)
col_append_str(pinfo->cinfo, COL_INFO, " [Shim6 CHECKSUM INCORRECT]");
p += 2;
/* Type specific data */
advance = dissect_shimctrl(tvb, p, shim.ip6s_p & SHIM6_BITMASK_TYPE, shim_tree);
p += advance;
/* Options */
while (p < offset+len) {
p += dissect_shimopts(tvb, p, shim_tree, pinfo);
}
}
return len;
}
void
proto_register_shim6(void)
{
static hf_register_info hf_shim6[] = {
{ &hf_shim6_nxt,
{ "Next Header", "shim6.nxt",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_shim6_len,
{ "Length", "shim6.len",
FT_UINT8, BASE_DEC, NULL, 0x0,
"Extension header length in 8-octet words (minus 1)", HFILL }
},
{ &hf_shim6_len_oct,
{ "Length", "shim6.len_oct",
FT_UINT16, BASE_DEC, NULL, 0x0,
"Extension header length in octets", HFILL }
},
{ &hf_shim6_p,
{ "P Bit", "shim6.p",
FT_BOOLEAN, 8, NULL, SHIM6_BITMASK_P,
NULL, HFILL }
},
{ &hf_shim6_ct,
{ "Context Tag", "shim6.ct",
FT_NONE, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_shim6_type,
{ "Message Type", "shim6.type",
FT_UINT8, BASE_DEC, VALS(shimctrlvals), SHIM6_BITMASK_TYPE,
NULL, HFILL }
},
{ &hf_shim6_proto,
{ "Protocol", "shim6.proto",
FT_UINT8, BASE_DEC, VALS(shim6_protocol), SHIM6_BITMASK_PROTOCOL,
NULL, HFILL }
},
{ &hf_shim6_checksum,
{ "Checksum", "shim6.checksum",
FT_UINT16, BASE_HEX, NULL, 0x0,
"Shim6 Checksum", HFILL }
},
{ &hf_shim6_checksum_status,
{ "Checksum Status", "shim6.checksum.status",
FT_UINT8, BASE_NONE, VALS(proto_checksum_vals), 0x0,
NULL, HFILL }
},
{ &hf_shim6_inonce,
{ "Initiator Nonce", "shim6.inonce",
FT_UINT32, BASE_DEC_HEX, NULL, 0x0,
NULL, HFILL }
},
{ &hf_shim6_rnonce,
{ "Responder Nonce", "shim6.rnonce",
FT_UINT32, BASE_DEC_HEX, NULL, 0x0,
NULL, HFILL }
},
{ &hf_shim6_reserved,
{ "Reserved", "shim6.reserved",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_shim6_reserved2,
{ "Reserved2", "shim6.reserved2",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_shim6_precvd,
{ "Probes Received", "shim6.precvd",
FT_UINT8, BASE_DEC, NULL, SHIM6_BITMASK_PRECVD,
NULL, HFILL }
},
{ &hf_shim6_psent,
{ "Probes Sent", "shim6.psent",
FT_UINT8, BASE_DEC, NULL, SHIM6_BITMASK_PSENT,
NULL, HFILL }
},
{ &hf_shim6_psrc,
{ "Source Address", "shim6.psrc",
FT_IPv6, BASE_NONE, NULL, 0x0,
"Shim6 Probe Source Address", HFILL }
},
{ &hf_shim6_pdst,
{ "Destination Address", "shim6.pdst",
FT_IPv6, BASE_NONE, NULL, 0x0,
"Shim6 Probe Destination Address", HFILL }
},
{ &hf_shim6_pnonce,
{ "Nonce", "shim6.pnonce",
FT_UINT32, BASE_DEC_HEX, NULL, 0x0,
"Shim6 Probe Nonce", HFILL }
},
{ &hf_shim6_pdata,
{ "Data", "shim6.pdata",
FT_UINT32, BASE_HEX, NULL, 0x0,
"Shim6 Probe Data", HFILL }
},
{ &hf_shim6_sulid,
{ "Sender ULID", "shim6.sulid",
FT_IPv6, BASE_NONE, NULL, 0x0,
"Shim6 Sender ULID", HFILL }
},
{ &hf_shim6_rulid,
{ "Receiver ULID", "shim6.rulid",
FT_IPv6, BASE_NONE, NULL, 0x0,
"Shim6 Receiver ULID", HFILL }
},
{ &hf_shim6_reap,
{ "REAP State", "shim6.reap",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_shim6_opt_type,
{ "Option Type", "shim6.opt.type",
FT_UINT16, BASE_DEC, VALS(shimoptvals), SHIM6_BITMASK_OPT_TYPE,
"Shim6 Option Type", HFILL }
},
{ &hf_shim6_opt_critical,
{ "Option Critical Bit", "shim6.opt.critical",
FT_BOOLEAN, 8, TFS(&tfs_yes_no), SHIM6_BITMASK_CRITICAL,
"TRUE: option is critical, FALSE: option is not critical", HFILL }
},
{ &hf_shim6_opt_len,
{ "Content Length", "shim6.opt.len",
FT_UINT16, BASE_DEC, NULL, 0x0,
"Content Length Option", HFILL }
},
{ &hf_shim6_opt_total_len,
{ "Total Length", "shim6.opt.total_len",
FT_UINT16, BASE_DEC, NULL, 0x0,
"Total Option Length", HFILL }
},
{ &hf_shim6_opt_loc_verif_methods,
{ "Verification Method", "shim6.opt.verif_method",
FT_UINT8, BASE_DEC, VALS(shimverifmethods), 0x0,
"Locator Verification Method", HFILL }
},
{ &hf_shim6_opt_loclist,
{ "Locator List Generation", "shim6.opt.loclist",
FT_UINT32, BASE_DEC_HEX, NULL, 0x0,
NULL, HFILL }
},
{ &hf_shim6_locator,
{ "Locator", "shim6.locator",
FT_IPv6, BASE_NONE, NULL, 0x0,
"Shim6 Locator", HFILL }
},
{ &hf_shim6_opt_locnum,
{ "Num Locators", "shim6.opt.locnum",
FT_UINT8, BASE_DEC, NULL, 0x0,
"Number of locators in Locator List", HFILL }
},
{ &hf_shim6_opt_elemlen,
{ "Element Length", "shim6.opt.elemlen",
FT_UINT8, BASE_DEC, NULL, 0x0,
"Length of Elements in Locator Preferences Option", HFILL }
},
{ &hf_shim6_loc_flag,
{ "Flags", "shim6.loc.flags",
FT_UINT8, BASE_DEC, NULL, 0x0,
"Locator Preferences Flags", HFILL }
},
{ &hf_shim6_loc_prio,
{ "Priority", "shim6.loc.prio",
FT_UINT8, BASE_DEC, NULL, 0x0,
"Locator Preferences Priority", HFILL }
},
{ &hf_shim6_loc_weight,
{ "Weight", "shim6.loc.weight",
FT_UINT8, BASE_DEC, NULL, 0x0,
"Locator Preferences Weight", HFILL }
},
{ &hf_shim6_opt_fii,
{ "Forked Instance Identifier", "shim6.opt.fii",
FT_UINT32, BASE_DEC_HEX, NULL, 0x0,
NULL, HFILL }
},
{ &hf_shim6_validator,
{ "Validator", "shim6.validator",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_shim6_cga_parameter_data_structure,
{ "CGA Parameter Data Structure", "shim6.cga_parameter_data_structure",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_shim6_cga_signature,
{ "CGA Signature", "shim6.cga_signature",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_shim6_padding,
{ "Padding", "shim6.padding",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }
}
};
static gint *ett_shim6[] = {
&ett_shim6_proto,
&ett_shim6_option,
&ett_shim6_locators,
&ett_shim6_verif_methods,
&ett_shim6_loc_pref,
&ett_shim6_probes_sent,
&ett_shim6_probes_rcvd,
&ett_shim6_probe_sent,
&ett_shim6_probe_rcvd,
&ett_shim6_cksum
};
static ei_register_info ei_shim6[] = {
{ &ei_shim6_opt_elemlen_invalid,
{ "shim6.opt.elemlen.invalid", PI_MALFORMED, PI_ERROR,
"Invalid element length", EXPFILL }
},
{ &ei_shim6_checksum_bad,
{ "shim6.checksum_bad.expert", PI_CHECKSUM, PI_ERROR,
"Bad checksum", EXPFILL }
}
};
expert_module_t* expert_shim6;
proto_shim6 = proto_register_protocol("Shim6 Protocol", "Shim6", "shim6");
proto_register_field_array(proto_shim6, hf_shim6, array_length(hf_shim6));
proto_register_subtree_array(ett_shim6, array_length(ett_shim6));
expert_shim6 = expert_register_protocol(proto_shim6);
expert_register_field_array(expert_shim6, ei_shim6, array_length(ei_shim6));
}
void
proto_reg_handoff_shim6(void)
{
dissector_handle_t shim6_handle;
shim6_handle = create_dissector_handle(dissect_shim6, proto_shim6);
dissector_add_uint("ipv6.nxt", IP_PROTO_SHIM6, shim6_handle);
}
/*
* Editor modelines
*
* Local Variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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