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wireshark/epan/dissectors/packet-lapsat.c

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/* packet-lapsat.c
*
* Routines for GMR-1 LAPSat dissection in wireshark.
*
* Link Access Procedures (LAP) for the Satellite Channel (LAPSat).
* LAPSat is the protocol for signalling transfer between an Access
* Terminal (MES) and a Gateway Station (GS) in the GeoMobile (GMR-1) network.
*
* Copyright (c) 2011 Sylvain Munaut <tnt@246tNt.com>
* Inspired on LAPDm code by Duncan Salerno <duncan.salerno@googlemail.com>
*
* References:
* [1] ETSI TS 101 376-4-6 V1.2.1 - GMR-1 04.006
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/reassemble.h>
#include <epan/conversation.h>
void proto_register_lapsat(void);
static int proto_lapsat = -1;
static reassembly_table lapsat_reassembly_table;
static dissector_table_t lapsat_sapi_dissector_table;
static gint ett_lapsat = -1;
static gint ett_lapsat_address = -1;
static gint ett_lapsat_control = -1;
static gint ett_lapsat_fragment = -1;
static gint ett_lapsat_fragments = -1;
static int hf_lapsat_addr = -1;
static int hf_lapsat_addr_sst = -1;
static int hf_lapsat_addr_cr = -1;
static int hf_lapsat_addr_sapi = -1;
static int hf_lapsat_addr_si = -1;
static int hf_lapsat_addr_lpd = -1;
static int hf_lapsat_addr_lfi = -1;
static int hf_lapsat_ctl = -1;
static int hf_lapsat_ctl_ftype_i = -1;
static int hf_lapsat_ctl_ftype_s_u = -1;
static int hf_lapsat_ctl_s_ftype = -1;
static int hf_lapsat_ctl_u_modifier_cmd = -1;
static int hf_lapsat_ctl_u_modifier_resp = -1;
static int hf_lapsat_ctl_n_r = -1;
static int hf_lapsat_ctl_n_s = -1;
static int hf_lapsat_ctl_p = -1;
static int hf_lapsat_ctl_f = -1;
static int hf_lapsat_ctl_mii = -1;
static int hf_lapsat_payload_last_nibble = -1;
static int hf_lapsat_len = -1;
static int hf_lapsat_fragment_data = -1;
static int hf_lapsat_fragments = -1;
static int hf_lapsat_fragment = -1;
static int hf_lapsat_fragment_overlap = -1;
static int hf_lapsat_fragment_overlap_conflicts = -1;
static int hf_lapsat_fragment_multiple_tails = -1;
static int hf_lapsat_fragment_too_long_fragment = -1;
static int hf_lapsat_fragment_error = -1;
static int hf_lapsat_fragment_count = -1;
static int hf_lapsat_reassembled_in = -1;
static int hf_lapsat_reassembled_length = -1;
#define LAPSAT_HEADER_LEN 3
#define LAPSAT_SAPI_RR_CC_MM 0
#define LAPSAT_SAPI_SMS 3
/*
* Address field bits
*/
#define LAPSAT_SST 0x01 /* SACCH status bit */
#define LAPSAT_CR 0x02 /* Command/Response bit */
#define LAPSAT_SAPI_MSK 0x0c /* Service Access Point Identifier */
#define LAPSAT_SAPI_SHIFT 2
#define LAPSAT_SI 0x10 /* Segment Indicator */
#define LAPSAT_LPD_MSK 0x60 /* DL for LAPSat or SMS-CB */
#define LAPSAT_LPD_SHIFT 6
#define LAPSAT_LFI 0x80 /* Length Field Indicator */
static const value_string lapsat_addr_sst_vals[] = {
{ 0, "FACCH and all other messages" },
{ 1, "SACCH message" },
{ 0 , NULL }
};
static const value_string lapsat_addr_sapi_vals[] = {
{ LAPSAT_SAPI_RR_CC_MM, "RR/MM/CC" },
{ LAPSAT_SAPI_SMS, "SMS/SS" },
{ 0, NULL }
};
static const value_string lapsat_addr_lpd_vals[] = {
{ 0, "Normal GMR-1" },
{ 1, "Cell broadcast service" },
{ 0, NULL }
};
static const value_string lapsat_addr_si_vals[] = {
{ 0, "Complete/Last Segment of L3 message" },
{ 1, "Segment only" },
{ 0, NULL }
};
static const value_string lapsat_addr_lfi_vals[] = {
{ 0, "Length Field not present (all data valid)" },
{ 1, "Length Field present" },
{ 0, NULL }
};
/*
* Frame types
*/
#define LAPSAT_CTL_TYPE_S 0x001
#define LAPSAT_CTL_TYPE_U 0x003
#define LAPSAT_CTL_TYPE_S_U_MSK 0x003
#define LAPSAT_CTL_TYPE_I 0x000
#define LAPSAT_CTL_TYPE_I_MSK 0x001
static const value_string lapsat_ctl_ftype_vals[] = {
{ LAPSAT_CTL_TYPE_I, "Information frame" },
{ LAPSAT_CTL_TYPE_S, "Supervisory frame" },
{ LAPSAT_CTL_TYPE_U, "Unnumbered frame" },
{ 0, NULL }
};
/*
* S-format frame types
*/
#define LAPSAT_CTL_S_FTYPE_MSK 0x00c
#define LAPSAT_RR 0x000
#define LAPSAT_GREJ 0x008
static const value_string lapsat_ctl_s_ftype_vals[] = {
{ LAPSAT_RR >> 2, "Receiver ready" },
{ LAPSAT_GREJ >> 2, "Group reject" },
{ 0, NULL}
};
/*
* U-format modifiers
*/
#define LAPSAT_CTL_U_MODIFIER_MSK 0x18c
#define LAPSAT_SABM 0x08c
#define LAPSAT_DM 0x00c
#define LAPSAT_DISC 0x100
#define LAPSAT_UA 0x180
#define LAPSAT_UI 0x000
static const value_string lapsat_ctl_u_modifier_vals_cmd[] = {
{ LAPSAT_SABM >> 2, "Set Asynchronous Balanced Mode" },
{ LAPSAT_DISC >> 2, "Disconnect" },
{ LAPSAT_UI >> 2, "Unnumbered Information" },
{ 0, NULL}
};
static const value_string lapsat_ctl_u_modifier_vals_resp[] = {
{ LAPSAT_DM >> 2, "Disconnected mode" },
{ LAPSAT_UA >> 2, "Unnumbered Acknowledge" },
{ 0, NULL}
};
/*
* Control fields
*/
#define LAPSAT_CTL_P_F 0x040
#define LAPSAT_CTL_MII 0x200
#define LAPSAT_CTL_N_R_MSK 0xf80
#define LAPSAT_CTL_N_R_SHIFT 7
#define LAPSAT_CTL_N_S_MSK 0x03e
#define LAPSAT_CTL_N_S_SHIFT 1
/*
* Fragment stuff
*/
static const value_string true_false_vals[] = {
{ 0, "False" },
{ 1, "True" },
{ 0, NULL },
};
static const fragment_items lapsat_frag_items = {
/* Fragment subtrees */
&ett_lapsat_fragment,
&ett_lapsat_fragments,
/* Fragment fields */
&hf_lapsat_fragments,
&hf_lapsat_fragment,
&hf_lapsat_fragment_overlap,
&hf_lapsat_fragment_overlap_conflicts,
&hf_lapsat_fragment_multiple_tails,
&hf_lapsat_fragment_too_long_fragment,
&hf_lapsat_fragment_error,
&hf_lapsat_fragment_count,
/* Reassembled in field */
&hf_lapsat_reassembled_in,
/* Reassembled length field */
&hf_lapsat_reassembled_length,
/* Reassembled data field */
NULL,
/* Tag */
"fragments"
};
/*
* Main dissection functions
*/
static guint16
dissect_control(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, int is_response)
{
proto_tree *ctl_tree;
proto_item *ctl_ti;
guint16 ctl, poll_final;
const char *frame_type;
char *info;
info = (char *)wmem_alloc(pinfo->pool, 80);
/* Grab complete control field */
ctl = tvb_get_ntohs(tvb, 1) >> 4;
poll_final = ctl & LAPSAT_CTL_P_F;
/* Generate small 'descriptive' text */
switch (ctl & LAPSAT_CTL_TYPE_S_U_MSK) {
case LAPSAT_CTL_TYPE_S:
/*
* Supervisory frame.
*/
switch (ctl & LAPSAT_CTL_S_FTYPE_MSK) {
case LAPSAT_RR:
frame_type = "RR";
break;
case LAPSAT_GREJ:
frame_type = "GREJ";
break;
default:
frame_type = "Unknown";
break;
}
snprintf(info, 80, "S%s, func=%s, N(R)=%u",
poll_final ? (is_response ? " F" : " P") : "",
frame_type,
(ctl & LAPSAT_CTL_N_R_MSK) >> LAPSAT_CTL_N_R_SHIFT);
break;
case LAPSAT_CTL_TYPE_U:
/*
* Unnumbered frame
*/
switch (ctl & LAPSAT_CTL_U_MODIFIER_MSK) {
case LAPSAT_SABM:
frame_type = (ctl & LAPSAT_CTL_MII) ?
"SABM, MII=1" : "SABM, MII=0";
break;
case LAPSAT_DM:
frame_type = "DM";
break;
case LAPSAT_DISC:
frame_type = "DISC";
break;
case LAPSAT_UA:
frame_type = "UA";
break;
case LAPSAT_UI:
frame_type = "UI";
break;
default:
frame_type = "Unknown";
break;
}
snprintf(info, 80, "U%s, func=%s",
poll_final ? (is_response ? " F" : " P") : "",
frame_type);
break;
default:
/*
* Information frame
*/
snprintf(info, 80, "I%s, N(R)=%u, N(S)=%u",
poll_final ? " P" : "",
(ctl & LAPSAT_CTL_N_R_MSK) >> LAPSAT_CTL_N_R_SHIFT,
(ctl & LAPSAT_CTL_N_S_MSK) >> LAPSAT_CTL_N_S_SHIFT);
break;
}
/* Add info */
col_add_str(pinfo->cinfo, COL_INFO, info);
/* Create item & subtree */
ctl_ti = proto_tree_add_uint_format_value(
tree, hf_lapsat_ctl,
tvb, 1, 2, (guint32)ctl,
"%s (0x%03x)", info, ctl
);
ctl_tree = proto_item_add_subtree(ctl_ti, ett_lapsat_control);
/* Add all fields */
switch (ctl & LAPSAT_CTL_TYPE_S_U_MSK) {
case LAPSAT_CTL_TYPE_S:
/*
* Supervisory frame.
*/
proto_tree_add_item(ctl_tree, hf_lapsat_ctl_ftype_s_u,
tvb, 1, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(ctl_tree, hf_lapsat_ctl_s_ftype,
tvb, 1, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(ctl_tree, hf_lapsat_ctl_n_r,
tvb, 1, 2, ENC_BIG_ENDIAN);
if (poll_final)
proto_tree_add_item(ctl_tree,
is_response ? hf_lapsat_ctl_f : hf_lapsat_ctl_p,
tvb, 1, 2, ENC_BIG_ENDIAN);
break;
case LAPSAT_CTL_TYPE_U:
/*
* Unnumbered frame
*/
proto_tree_add_item(ctl_tree, hf_lapsat_ctl_ftype_s_u,
tvb, 1, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(ctl_tree,
is_response ? hf_lapsat_ctl_u_modifier_resp :
hf_lapsat_ctl_u_modifier_cmd,
tvb, 1, 2, ENC_BIG_ENDIAN);
if (poll_final)
proto_tree_add_item(ctl_tree,
is_response ? hf_lapsat_ctl_f : hf_lapsat_ctl_p,
tvb, 1, 2, ENC_BIG_ENDIAN);
if (((ctl & LAPSAT_CTL_U_MODIFIER_MSK) == LAPSAT_SABM) &&
(ctl & LAPSAT_CTL_MII))
proto_tree_add_item(ctl_tree, hf_lapsat_ctl_mii,
tvb, 1, 2, ENC_BIG_ENDIAN);
break;
default:
/*
* Information frame
*/
proto_tree_add_item(ctl_tree, hf_lapsat_ctl_ftype_i,
tvb, 1, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(ctl_tree, hf_lapsat_ctl_n_r,
tvb, 1, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(ctl_tree, hf_lapsat_ctl_n_s,
tvb, 1, 2, ENC_BIG_ENDIAN);
if (poll_final)
proto_tree_add_item(ctl_tree, hf_lapsat_ctl_p,
tvb, 1, 2, ENC_BIG_ENDIAN);
break;
}
return ctl;
}
static int
dissect_lapsat(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* dissector_data _U_)
{
proto_tree *lapsat_tree, *addr_tree;
proto_item *lapsat_ti, *addr_ti;
tvbuff_t *payload;
guint8 addr, sapi, cr;
guint16 control;
unsigned int hlen, is_response = 0, plen;
/* Check that there's enough data */
if (tvb_captured_length(tvb) < LAPSAT_HEADER_LEN)
return 0;
/* Set protocol column */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "LAPSat");
/* Grab a couple of fields */
addr = tvb_get_guint8(tvb, 0);
sapi = (addr & LAPSAT_SAPI_MSK) >> LAPSAT_SAPI_SHIFT;
cr = addr & LAPSAT_CR;
if (pinfo->p2p_dir == P2P_DIR_RECV) {
is_response = cr ? FALSE : TRUE;
}
else if (pinfo->p2p_dir == P2P_DIR_SENT) {
is_response = cr ? TRUE : FALSE;
}
hlen = LAPSAT_HEADER_LEN;
if (addr & LAPSAT_LFI)
hlen++;
/* FIXME if "S func=GREJ", extend */
/* Create LAPSat tree */
lapsat_ti = proto_tree_add_item(tree, proto_lapsat, tvb, 0, hlen, ENC_NA);
lapsat_tree = proto_item_add_subtree(lapsat_ti, ett_lapsat);
/* Dissect address field */
addr_ti = proto_tree_add_item(lapsat_tree, hf_lapsat_addr, tvb, 0, 1, ENC_BIG_ENDIAN);
addr_tree = proto_item_add_subtree(addr_ti, ett_lapsat_address);
proto_tree_add_item(addr_tree, hf_lapsat_addr_sst, tvb, 0, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(addr_tree, hf_lapsat_addr_cr, tvb, 0, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(addr_tree, hf_lapsat_addr_sapi, tvb, 0, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(addr_tree, hf_lapsat_addr_si, tvb, 0, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(addr_tree, hf_lapsat_addr_lpd, tvb, 0, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(addr_tree, hf_lapsat_addr_lfi, tvb, 0, 1, ENC_BIG_ENDIAN);
/* Dissect control field */
control = dissect_control(tvb, pinfo, lapsat_tree, is_response);
/* Last payload nibble */
proto_tree_add_item(lapsat_tree, hf_lapsat_payload_last_nibble, tvb, 2, 1, ENC_BIG_ENDIAN);
/* Optional length field */
if (addr & LAPSAT_LFI)
proto_tree_add_item(lapsat_tree, hf_lapsat_len, tvb, 3, 1, ENC_BIG_ENDIAN);
/* If frame is "S func=GREJ", then add Na(R) & Nb(R) */
/* FIXME */
/* Get the payload */
plen = (addr & LAPSAT_LFI) ?
tvb_get_guint8(tvb, 3) : tvb_captured_length(tvb) - hlen;
if (!plen)
return 3; /* No point in doing more if there is no payload */
if ((plen + hlen) == tvb_captured_length(tvb)) {
/* Need to integrate the last nibble */
guint8 *data = (guint8 *)tvb_memdup(pinfo->pool, tvb, hlen, plen);
data[plen-1] |= tvb_get_guint8(tvb, 2) << 4;
payload = tvb_new_child_real_data(tvb, data, plen, plen);
} else {
/* Last nibble doesn't need merging */
payload = tvb_new_subset_length_caplen(tvb, hlen, plen, plen);
}
add_new_data_source(pinfo, payload, "LAPSat Payload");
/* Handle fragments */
if ((control & LAPSAT_CTL_TYPE_I_MSK) == LAPSAT_CTL_TYPE_I) {
/*
* Potentially fragmented I frames
*/
fragment_head *fd_m = NULL;
tvbuff_t *reassembled = NULL;
guint32 fragment_id;
gboolean save_fragmented = pinfo->fragmented;
/* Is this a fragment ? */
pinfo->fragmented = !!(addr & LAPSAT_SI);
/* Rely on caller to provide a way to group fragments */
fragment_id = (conversation_get_id_from_key(pinfo, CONVERSATION_GSMTAP, USE_LAST_ENDPOINT) << 3) | (sapi << 1) | pinfo->p2p_dir;
/* Fragment reconstruction helpers */
fd_m = fragment_add_seq_next(
&lapsat_reassembly_table,
payload, 0,
pinfo,
fragment_id, /* To group fragments */
NULL,
plen,
!!(addr & LAPSAT_SI) /* More fragment ? */
);
reassembled = process_reassembled_data(
payload, 0, pinfo,
"Reassembled LAPSat", fd_m, &lapsat_frag_items,
NULL, lapsat_tree
);
/* Reassembled into this packet ? */
if (fd_m && pinfo->num == fd_m->reassembled_in) {
/* Yes, so handoff to upper layers */
if (!dissector_try_uint(lapsat_sapi_dissector_table, sapi,
reassembled, pinfo, tree))
call_data_dissector(reassembled, pinfo, tree);
} else {
/* No, just add infos */
col_append_str(pinfo->cinfo, COL_INFO, " (Fragment)");
proto_tree_add_item(lapsat_tree, hf_lapsat_fragment_data, payload, 0, -1, ENC_NA);
}
/* Now reset fragmentation information in pinfo */
pinfo->fragmented = save_fragmented;
} else {
/*
* Whole frame
*/
if (!dissector_try_uint(lapsat_sapi_dissector_table, sapi, payload, pinfo, tree))
call_data_dissector(payload, pinfo, tree);
}
return tvb_captured_length(tvb);
}
void
proto_register_lapsat(void)
{
static hf_register_info hf[] = {
/* Address field */
{ &hf_lapsat_addr,
{ "Address Field", "lapsat.address",
FT_UINT8, BASE_HEX, NULL, 0x00,
NULL, HFILL },
},
{ &hf_lapsat_addr_sst,
{ "SST", "lapsat.address.sst",
FT_UINT8, BASE_DEC, VALS(lapsat_addr_sst_vals), LAPSAT_SST,
"SACCH status bit", HFILL },
},
{ &hf_lapsat_addr_cr,
{ "C/R", "lapsat.address.cr",
FT_UINT8, BASE_DEC, NULL, LAPSAT_CR,
"Command/response bit", HFILL },
},
{ &hf_lapsat_addr_sapi,
{ "SAPI", "lapsat.address.sapi",
FT_UINT8, BASE_DEC, VALS(lapsat_addr_sapi_vals), LAPSAT_SAPI_MSK,
"Service access point identifier", HFILL },
},
{ &hf_lapsat_addr_si,
{ "SI", "lapsat.address.si",
FT_UINT8, BASE_DEC, VALS(lapsat_addr_si_vals), LAPSAT_SI,
"Segment Indicator", HFILL },
},
{ &hf_lapsat_addr_lpd,
{ "LPD", "lapsat.address.lpd",
FT_UINT8, BASE_DEC, VALS(lapsat_addr_lpd_vals), LAPSAT_LPD_MSK,
"Link Protocol Discriminator", HFILL },
},
{ &hf_lapsat_addr_lfi,
{ "LFI", "lapsat.address.lfi",
FT_UINT8, BASE_DEC, VALS(lapsat_addr_lfi_vals), LAPSAT_LFI,
"Length Field Indicator", HFILL },
},
/* Control field */
{ &hf_lapsat_ctl,
{ "Control Field", "lapsat.control_field",
FT_UINT16, BASE_HEX, NULL, 0x00,
NULL, HFILL }
},
{ &hf_lapsat_ctl_ftype_i,
{ "Frame type", "lapsat.control.ftype",
FT_UINT16, BASE_DEC, VALS(lapsat_ctl_ftype_vals), LAPSAT_CTL_TYPE_I_MSK << 4,
NULL, HFILL }
},
{ &hf_lapsat_ctl_ftype_s_u,
{ "Frame type", "lapsat.control.ftype",
FT_UINT16, BASE_DEC, VALS(lapsat_ctl_ftype_vals), LAPSAT_CTL_TYPE_S_U_MSK << 4,
NULL, HFILL }
},
{ &hf_lapsat_ctl_s_ftype,
{ "Supervisory frame type", "lapsat.control.s_ftype",
FT_UINT16, BASE_DEC, VALS(lapsat_ctl_s_ftype_vals), LAPSAT_CTL_S_FTYPE_MSK << 4,
NULL, HFILL }
},
{ &hf_lapsat_ctl_u_modifier_cmd,
{ "Command", "lapsat.control.u_modifier_cmd",
FT_UINT16, BASE_HEX, VALS(lapsat_ctl_u_modifier_vals_cmd),
LAPSAT_CTL_U_MODIFIER_MSK << 4,
NULL, HFILL }
},
{ &hf_lapsat_ctl_u_modifier_resp,
{ "Response", "lapsat.control.u_modifier_resp",
FT_UINT16, BASE_HEX, VALS(lapsat_ctl_u_modifier_vals_resp),
LAPSAT_CTL_U_MODIFIER_MSK << 4,
NULL, HFILL }
},
{ &hf_lapsat_ctl_n_r,
{ "N(R)", "lapsat.control.n_r",
FT_UINT16, BASE_DEC, NULL, LAPSAT_CTL_N_R_MSK << 4,
NULL, HFILL }
},
{ &hf_lapsat_ctl_n_s,
{ "N(S)", "lapsat.control.n_s",
FT_UINT16, BASE_DEC, NULL, LAPSAT_CTL_N_S_MSK << 4,
NULL, HFILL }
},
{ &hf_lapsat_ctl_p,
{ "Poll", "lapsat.control.p",
FT_UINT16, BASE_DEC, VALS(true_false_vals), LAPSAT_CTL_P_F << 4,
NULL, HFILL }
},
{ &hf_lapsat_ctl_f,
{ "Final", "lapsat.control.f",
FT_UINT16, BASE_DEC, VALS(true_false_vals), LAPSAT_CTL_P_F << 4,
NULL, HFILL }
},
{ &hf_lapsat_ctl_mii,
{ "MII", "lapsat.control.mii",
FT_UINT16, BASE_DEC, VALS(true_false_vals), LAPSAT_CTL_MII << 4,
"Mobile Identity Indicator", HFILL }
},
/* Payload last nibble */
{ &hf_lapsat_payload_last_nibble,
{ "Payload last nibble", "lapsat.payload.last_nibble",
FT_UINT8, BASE_HEX, NULL, 0x0f,
NULL, HFILL }
},
/* Length field */
{ &hf_lapsat_len,
{ "Length Field", "lapsat.length",
FT_UINT8, BASE_DEC, NULL, 0x00,
NULL, HFILL },
},
/* Fragment reassembly */
{ &hf_lapsat_fragment_data,
{ "Fragment Data", "lapsat.fragment_data",
FT_BYTES, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_lapsat_fragments,
{ "Message fragments", "lapsat.fragments",
FT_NONE, BASE_NONE, NULL, 0x00,
"LAPSat Message fragments", HFILL }
},
{ &hf_lapsat_fragment,
{ "Message fragment", "lapsat.fragment",
FT_FRAMENUM, BASE_NONE, NULL, 0x00,
"LAPSat Message fragment", HFILL }
},
{ &hf_lapsat_fragment_overlap,
{ "Message fragment overlap", "lapsat.fragment.overlap",
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
"LAPSat Message fragment overlaps with other fragment(s)", HFILL }
},
{ &hf_lapsat_fragment_overlap_conflicts,
{ "Message fragment overlapping with conflicting data",
"lapsat.fragment.overlap.conflicts",
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
"LAPSat Message fragment overlaps with conflicting data", HFILL }
},
{ &hf_lapsat_fragment_multiple_tails,
{ "Message has multiple tail fragments", "lapsat.fragment.multiple_tails",
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
"LAPSat Message fragment has multiple tail fragments", HFILL }
},
{ &hf_lapsat_fragment_too_long_fragment,
{ "Message fragment too long", "lapsat.fragment.too_long_fragment",
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
"LAPSat Message fragment data goes beyond the packet end", HFILL }
},
{ &hf_lapsat_fragment_error,
{ "Message defragmentation error", "lapsat.fragment.error",
FT_FRAMENUM, BASE_NONE, NULL, 0x00,
"LAPSat Message defragmentation error due to illegal fragments", HFILL }
},
{ &hf_lapsat_fragment_count,
{ "Message fragment count", "lapsat.fragment.count",
FT_UINT32, BASE_DEC, NULL, 0x00,
NULL, HFILL }
},
{ &hf_lapsat_reassembled_in,
{ "Reassembled in", "lapsat.reassembled.in",
FT_FRAMENUM, BASE_NONE, NULL, 0x00,
"LAPSat Message has been reassembled in this packet.", HFILL }
},
{ &hf_lapsat_reassembled_length,
{ "Reassembled LAPSat length", "lapsat.reassembled.length",
FT_UINT32, BASE_DEC, NULL, 0x00,
"The total length of the reassembled payload", HFILL }
},
};
static gint *ett[] = {
&ett_lapsat,
&ett_lapsat_address,
&ett_lapsat_control,
&ett_lapsat_fragment,
&ett_lapsat_fragments,
};
proto_lapsat = proto_register_protocol("Link Access Procedure, Satellite channel (LAPSat)", "LAPSat", "lapsat");
proto_register_field_array (proto_lapsat, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
register_dissector("lapsat", dissect_lapsat, proto_lapsat);
lapsat_sapi_dissector_table = register_dissector_table("lapsat.sapi", "LAPSat SAPI", proto_lapsat, FT_UINT8, BASE_DEC);
reassembly_table_register(&lapsat_reassembly_table,
&addresses_reassembly_table_functions);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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