forked from osmocom/wireshark
![Dario Lombardo](/assets/img/avatar_default.png)
Change-Id: I92c94448e6641716d03158a5f332c8b53709423a Reviewed-on: https://code.wireshark.org/review/25756 Petri-Dish: Dario Lombardo <lomato@gmail.com> Reviewed-by: Anders Broman <a.broman58@gmail.com>
122 lines
3.6 KiB
C
122 lines
3.6 KiB
C
/* packet-clip.c
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* Routines for clip packet disassembly
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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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*
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* This file created by Thierry Andry <Thierry.Andry@advalvas.be>
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* from nearly-the-same packet-raw.c created by Mike Hall <mlh@io.com>
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* Copyright 1999
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/expert.h>
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#include <wiretap/wtap.h>
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#include "packet-ip.h"
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void proto_register_clip(void);
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void proto_reg_handoff_clip(void);
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static int proto_clip = -1;
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static gint ett_clip = -1;
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static expert_field ei_no_link_info = EI_INIT;
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static dissector_handle_t ip_handle;
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static int
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dissect_clip(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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proto_item *fh_item;
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/* load the top pane info. This should be overwritten by
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the next protocol in the stack */
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col_set_str(pinfo->cinfo, COL_RES_DL_SRC, "N/A");
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col_set_str(pinfo->cinfo, COL_RES_DL_DST, "N/A");
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "CLIP");
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col_set_str(pinfo->cinfo, COL_INFO, "Classical IP frame");
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/* populate a tree in the second pane with the status of the link
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layer (ie none)
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XXX - the Linux Classical IP code supports both LLC Encapsulation,
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which puts an LLC header and possibly a SNAP header in front of
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the network-layer header, and VC Based Multiplexing, which puts
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no headers in front of the network-layer header.
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The ATM on Linux code includes a patch to "tcpdump"
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that compares the first few bytes of the packet with the
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LLC header that Classical IP frames may have and, if there's
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a SNAP LLC header at the beginning of the packet, it gets
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the packet type from that header and uses that, otherwise
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it treats the packet as being raw IP with no link-level
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header, in order to handle both of those.
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This code, however, won't handle LLC Encapsulation. We've
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not yet seen a capture taken on a machine using LLC Encapsulation,
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however. If we see one, we can modify the code.
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A future version of libpcap, however, will probably use DLT_LINUX_SLL
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for both of those cases, to avoid the headache of having to
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generate capture-filter code to handle both of those cases. */
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fh_item = proto_tree_add_item(tree, proto_clip, tvb, 0, 0, ENC_NA);
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expert_add_info(pinfo, fh_item, &ei_no_link_info);
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call_dissector(ip_handle, tvb, pinfo, tree);
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return tvb_captured_length(tvb);
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}
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void
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proto_register_clip(void)
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{
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static gint *ett[] = {
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&ett_clip,
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};
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static ei_register_info ei[] = {
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{ &ei_no_link_info, { "clip.no_link_info", PI_PROTOCOL, PI_NOTE, "No link information available", EXPFILL }},
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};
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expert_module_t* expert_clip;
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proto_clip = proto_register_protocol("Classical IP frame", "CLIP", "clip");
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proto_register_subtree_array(ett, array_length(ett));
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expert_clip = expert_register_protocol(proto_clip);
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expert_register_field_array(expert_clip, ei, array_length(ei));
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}
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void
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proto_reg_handoff_clip(void)
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{
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dissector_handle_t clip_handle;
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/*
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* Get a handle for the IP dissector.
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*/
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ip_handle = find_dissector_add_dependency("ip", proto_clip);
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clip_handle = create_dissector_handle(dissect_clip, proto_clip);
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/* XXX - no protocol, can't be disabled */
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dissector_add_uint("wtap_encap", WTAP_ENCAP_LINUX_ATM_CLIP, clip_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: 2
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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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* ex: set shiftwidth=2 tabstop=8 expandtab:
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* :indentSize=2:tabSize=8:noTabs=true:
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*/
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