![Guy Harris](/assets/img/avatar_default.png)
For a number of protocols that encapsulate 802.11 frames inside packets, whether the frame includes an FCS or not is specified by the protocol, not by whether the link-layer frame carrying the packets *itself* includes an FCS. As we've done with Ethernet, add "_withfcs" and "_withoutfcs" dissectors, which *don't* check the pseudo-header FCS length indication, and call those, rather than dissectors that check the pseudo-header length indication, from the dissectors for those protocols. Change-Id: Ib8c8ecdd872e1782fdfc66e7573415d91911a62e Reviewed-on: https://code.wireshark.org/review/1866 Reviewed-by: Guy Harris <guy@alum.mit.edu>
314 lines
11 KiB
C
314 lines
11 KiB
C
/* packet-aruba-erm.c
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* Routines for the disassembly of Aruba encapsulated remote mirroring frames
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* (Adapted from packet-hp-erm.c and packet-cisco-erspan.c)
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*
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* Copyright 2010 Alexis La Goutte <alexis.lagoutte at gmail dot com>
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*
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* ERM Radio-Format added by Hadriel Kaplan
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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/*
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* Format:
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* Use the Header of Record (Packet) Header
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*
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* typedef struct pcaprec_hdr_s {
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* guint32 ts_sec; timestamp seconds
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* guint32 ts_usec; timestamp microseconds
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* guint32 incl_len; number of octets of packet saved in file
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* guint32 orig_len; actual length of packet
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* } pcaprec_hdr_t;
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*
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* Following with 802.11 header
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*/
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/*
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* Format:
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* The ERM Radio-Format has the above header, plus more, like this:
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*
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* struct radio_pcap_hdr {
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* struct timeval ts;
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* __u32 capture_length;
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* __u32 frame_length;
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* __u16 rate_per_half_mhz;
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* __u8 channel;
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* __u8 signal_percent;
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* } __attribute__ ((packed));
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*
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* Following with 802.11 header
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*/
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#include "config.h"
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/expert.h>
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#include <epan/prefs.h>
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#define PROTO_SHORT_NAME "ARUBA_ERM"
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#define PROTO_LONG_NAME "ARUBA encapsulated remote mirroring"
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#define TYPE_PCAP 0
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#define TYPE_PEEK 1
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#define TYPE_AIRMAGNET 2
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#define TYPE_PCAPPLUSRADIO 3
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#define TYPE_PPI 4
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static const value_string aruba_erm_type_vals[] = {
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{ TYPE_PCAP, "pcap (type 0)" },
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{ TYPE_PEEK, "peek (type 1)" },
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{ TYPE_AIRMAGNET, "Airmagnet (type 2)" },
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{ TYPE_PCAPPLUSRADIO, "pcap + radio (type 3)" },
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{ TYPE_PPI, "ppi (type 4)" },
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{ 0, NULL }
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};
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void proto_register_aruba_erm(void);
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void proto_reg_handoff_aruba_erm(void);
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void proto_reg_handoff_aruba_erm_radio(void);
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static range_t *global_aruba_erm_port_range;
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static gint aruba_erm_type = 0;
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static int proto_aruba_erm = -1;
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static int hf_aruba_erm_time = -1;
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static int hf_aruba_erm_incl_len = -1;
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static int hf_aruba_erm_orig_len = -1;
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static int hf_aruba_erm_data_rate = -1;
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static int hf_aruba_erm_data_rate_gen = -1;
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static int hf_aruba_erm_channel = -1;
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static int hf_aruba_erm_signal_strength = -1;
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static gint ett_aruba_erm = -1;
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static expert_field ei_aruba_erm_airmagnet = EI_INIT;
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static dissector_handle_t aruba_erm_handle;
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static dissector_handle_t ieee80211_handle;
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static dissector_handle_t peek_handle;
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static dissector_handle_t ppi_handle;
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static dissector_handle_t data_handle;
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static int
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dissect_aruba_erm_pcap(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *aruba_erm_tree, gint offset)
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{
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nstime_t ts;
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ts.secs = tvb_get_ntohl(tvb, 0);
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ts.nsecs = tvb_get_ntohl(tvb,4)*1000;
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proto_tree_add_time(aruba_erm_tree, hf_aruba_erm_time, tvb, offset, 8,&ts);
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offset +=8;
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proto_tree_add_item(aruba_erm_tree, hf_aruba_erm_incl_len, tvb, 8, 4, ENC_BIG_ENDIAN);
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offset +=4;
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proto_tree_add_item(aruba_erm_tree, hf_aruba_erm_orig_len, tvb, 12, 4, ENC_BIG_ENDIAN);
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offset +=4;
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return offset;
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}
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static int
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dissect_aruba_erm_pcap_radio(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *aruba_erm_tree, gint offset)
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{
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proto_item *ti_data_rate;
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guint16 data_rate;
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data_rate = tvb_get_ntohs(tvb, offset);
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proto_tree_add_item(aruba_erm_tree, hf_aruba_erm_data_rate, tvb, offset, 2, ENC_BIG_ENDIAN);
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ti_data_rate = proto_tree_add_float_format(aruba_erm_tree, hf_aruba_erm_data_rate_gen,
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tvb, 16, 2,
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(float)data_rate / 2,
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"Data Rate: %.1f Mb/s",
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(float)data_rate / 2);
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PROTO_ITEM_SET_GENERATED(ti_data_rate);
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offset += 2;
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proto_tree_add_item(aruba_erm_tree, hf_aruba_erm_channel, tvb, offset, 1, ENC_NA);
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offset += 1;
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proto_tree_add_item(aruba_erm_tree, hf_aruba_erm_signal_strength, tvb, offset, 1, ENC_NA);
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offset += 1;
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return offset;
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}
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static void
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dissect_aruba_erm(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_item *ti;
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proto_tree *aruba_erm_tree;
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tvbuff_t *eth_tvb;
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int offset = 0 ;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, PROTO_SHORT_NAME);
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col_set_str(pinfo->cinfo, COL_INFO, PROTO_SHORT_NAME);
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ti = proto_tree_add_item(tree, proto_aruba_erm, tvb, 0, 0, ENC_NA);
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proto_item_append_text(ti, ": %s", val_to_str(aruba_erm_type, aruba_erm_type_vals, "Unknown"));
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aruba_erm_tree = proto_item_add_subtree(ti, ett_aruba_erm);
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switch(aruba_erm_type){
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case TYPE_PCAP:
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offset = dissect_aruba_erm_pcap(tvb, pinfo, aruba_erm_tree, offset);
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proto_item_set_len(ti, offset);
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eth_tvb = tvb_new_subset_remaining(tvb, offset);
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call_dissector(ieee80211_handle, eth_tvb, pinfo, tree);
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break;
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case TYPE_PEEK:
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call_dissector(peek_handle, tvb, pinfo, tree);
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break;
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case TYPE_AIRMAGNET:
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/* Not (yet) supported launch data dissector */
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proto_tree_add_expert(tree, pinfo, &ei_aruba_erm_airmagnet, tvb, offset, -1);
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call_dissector(data_handle, tvb, pinfo, tree);
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break;
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case TYPE_PCAPPLUSRADIO:
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offset = dissect_aruba_erm_pcap(tvb, pinfo, aruba_erm_tree, offset);
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offset = dissect_aruba_erm_pcap_radio(tvb, pinfo, aruba_erm_tree, offset);
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proto_item_set_len(ti, offset);
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eth_tvb = tvb_new_subset_remaining(tvb, offset);
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call_dissector(ieee80211_handle, eth_tvb, pinfo, tree);
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break;
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case TYPE_PPI:
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call_dissector(ppi_handle, tvb, pinfo, tree);
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break;
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default:
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break;
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}
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}
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void
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proto_register_aruba_erm(void)
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{
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static hf_register_info hf[] = {
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{ &hf_aruba_erm_time,
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{ "Packet Capture Timestamp", "aruba_erm.time", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL,
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0x00, NULL, HFILL }},
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{ &hf_aruba_erm_incl_len,
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{ "Packet Captured Length", "aruba_erm.incl_len", FT_UINT32, BASE_DEC, NULL,
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0x00, NULL, HFILL }},
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{ &hf_aruba_erm_orig_len,
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{ "Packet Length", "aruba_erm.orig_len", FT_UINT32, BASE_DEC, NULL,
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0x00, NULL, HFILL }},
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{ &hf_aruba_erm_data_rate,
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{ "Data Rate", "aruba_erm.data_rate", FT_UINT16, BASE_DEC, NULL,
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0x00, "Data rate (1/2 Mb/s)", HFILL }},
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{ &hf_aruba_erm_data_rate_gen,
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{ "Data Rate", "aruba_erm.data_rate_gen", FT_FLOAT, BASE_NONE, NULL,
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0x00, "Data rate (1/2 Mb/s)", HFILL }},
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{ &hf_aruba_erm_channel,
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{ "Channel", "aruba_erm.channel", FT_UINT8, BASE_DEC, NULL,
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0x00, "802.11 channel number that this frame was sent/received on", HFILL }},
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{ &hf_aruba_erm_signal_strength,
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{ "Signal Strength [percent]", "aruba_erm.signal_strength", FT_UINT8, BASE_DEC, NULL,
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0x00, "Signal strength (Percentage)", HFILL }},
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};
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/* both formats share the same tree */
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static gint *ett[] = {
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&ett_aruba_erm,
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};
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static ei_register_info ei[] = {
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{ &ei_aruba_erm_airmagnet, { "aruba_erm.airmagnet", PI_UNDECODED, PI_ERROR, "Airmagnet (type 2) is no yet supported (Please use other type)", EXPFILL }}
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};
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static const enum_val_t aruba_erm_types[] = {
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{ "pcap_type_0", "pcap (type 0)", TYPE_PCAP},
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{ "peek_type_1", "peek (type1)", TYPE_PEEK},
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{ "airmagnet_type_2", "airmagnet (type 2)", TYPE_AIRMAGNET},
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{ "pcapplusradio_type_3", "pcap+radio header (type 3)", TYPE_PCAPPLUSRADIO},
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{ "ppi_type_4", "ppi (type 4)", TYPE_PPI},
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{ NULL, NULL, -1}
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};
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module_t *aruba_erm_module;
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expert_module_t* expert_aruba_erm;
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proto_aruba_erm = proto_register_protocol(PROTO_LONG_NAME, PROTO_SHORT_NAME, "aruba_erm");
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range_convert_str (&global_aruba_erm_port_range, "0", MAX_UDP_PORT);
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aruba_erm_module = prefs_register_protocol(proto_aruba_erm, proto_reg_handoff_aruba_erm);
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prefs_register_range_preference(aruba_erm_module, "udp.ports", "ARUBA_ERM UDP Port numbers",
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"Set the UDP port numbers (typically the range 5555 to 5560) used for ARUBA"
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" encapsulated remote mirroring frames;\n"
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"0 (default) means that the ARUBA_ERM dissector is not active\n",
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&global_aruba_erm_port_range, MAX_UDP_PORT);
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prefs_register_enum_preference(aruba_erm_module, "type.captured",
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"Type of formats for captured packets",
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"Type of formats for captured packets",
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&aruba_erm_type, aruba_erm_types, FALSE);
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proto_register_field_array(proto_aruba_erm, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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expert_aruba_erm = expert_register_protocol(proto_aruba_erm);
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expert_register_field_array(expert_aruba_erm, ei, array_length(ei));
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}
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void
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proto_reg_handoff_aruba_erm(void)
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{
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static range_t *aruba_erm_port_range;
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static range_t *aruba_erm_radio_port_range;
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static gboolean initialized = FALSE;
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if (!initialized) {
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ieee80211_handle = find_dissector("wlan_withoutfcs");
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ppi_handle = find_dissector("ppi");
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peek_handle = find_dissector("peekremote");
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data_handle = find_dissector("data");
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aruba_erm_handle = create_dissector_handle(dissect_aruba_erm, proto_aruba_erm);
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initialized = TRUE;
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} else {
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dissector_delete_uint_range("udp.port", aruba_erm_port_range, aruba_erm_handle);
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g_free(aruba_erm_port_range);
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g_free(aruba_erm_radio_port_range);
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}
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aruba_erm_port_range = range_copy(global_aruba_erm_port_range);
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dissector_add_uint_range("udp.port", aruba_erm_port_range, aruba_erm_handle);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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