cc07b815f3
Change-Id: Ifaf96e8482316720bddc5bab3aab3d0a677fe5fb Reviewed-on: https://code.wireshark.org/review/15464 Reviewed-by: Guy Harris <guy@alum.mit.edu>
307 lines
9.5 KiB
C
307 lines
9.5 KiB
C
/* packet-vlan.c
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* Routines for VLAN 802.1Q ethernet header 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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* 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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#define NEW_PROTO_TREE_API
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/capture_dissectors.h>
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#include <wsutil/pint.h>
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#include <epan/expert.h>
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#include "packet-ieee8023.h"
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#include "packet-ipx.h"
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#include "packet-llc.h"
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#include <epan/etypes.h>
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#include <epan/prefs.h>
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#include <epan/to_str.h>
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#include <epan/addr_resolv.h>
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void proto_register_vlan(void);
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void proto_reg_handoff_vlan(void);
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static unsigned int q_in_q_ethertype = ETHERTYPE_QINQ_OLD;
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static gboolean vlan_summary_in_tree = TRUE;
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static dissector_handle_t vlan_handle;
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static dissector_handle_t ethertype_handle;
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static header_field_info *hfi_vlan = NULL;
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#define VLAN_HFI_INIT HFI_INIT(proto_vlan)
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/* From Table G-2 of IEEE standard 802.1D-2004 */
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static const value_string pri_vals[] = {
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{ 1, "Background" },
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{ 2, "Spare" },
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{ 0, "Best Effort (default)" },
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{ 3, "Excellent Effort" },
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{ 4, "Controlled Load" },
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{ 5, "Video, < 100ms latency and jitter" },
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{ 6, "Voice, < 10ms latency and jitter" },
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{ 7, "Network Control" },
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{ 0, NULL }
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};
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static header_field_info hfi_vlan_priority VLAN_HFI_INIT = {
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"Priority", "vlan.priority", FT_UINT16, BASE_DEC,
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VALS(pri_vals), 0xE000, "Descriptions are recommendations from IEEE standard 802.1D-2004", HFILL };
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static const value_string cfi_vals[] = {
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{ 0, "Canonical" },
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{ 1, "Non-canonical" },
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{ 0, NULL }
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};
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static header_field_info hfi_vlan_cfi VLAN_HFI_INIT = {
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"CFI", "vlan.cfi", FT_UINT16, BASE_DEC,
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VALS(cfi_vals), 0x1000, "Canonical Format Identifier", HFILL };
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static header_field_info hfi_vlan_id VLAN_HFI_INIT = {
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"ID", "vlan.id", FT_UINT16, BASE_DEC,
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NULL, 0x0FFF, "VLAN ID", HFILL };
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static header_field_info hfi_vlan_id_name VLAN_HFI_INIT = {
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"Name", "vlan.id_name", FT_STRING, STR_UNICODE,
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NULL, 0x0, "VLAN ID Name", HFILL };
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static header_field_info hfi_vlan_etype VLAN_HFI_INIT = {
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"Type", "vlan.etype", FT_UINT16, BASE_HEX,
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VALS(etype_vals), 0x0, "Ethertype", HFILL };
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static header_field_info hfi_vlan_len VLAN_HFI_INIT = {
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"Length", "vlan.len", FT_UINT16, BASE_DEC,
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NULL, 0x0, NULL, HFILL };
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static header_field_info hfi_vlan_trailer VLAN_HFI_INIT = {
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"Trailer", "vlan.trailer", FT_BYTES, BASE_NONE,
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NULL, 0x0, "VLAN Trailer", HFILL };
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static gint ett_vlan = -1;
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static expert_field ei_vlan_len = EI_INIT;
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static gboolean
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capture_vlan(const guchar *pd, int offset, int len, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header _U_ ) {
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guint16 encap_proto;
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if ( !BYTES_ARE_IN_FRAME(offset,len,5) )
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return FALSE;
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encap_proto = pntoh16( &pd[offset+2] );
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if ( encap_proto <= IEEE_802_3_MAX_LEN) {
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if ( pd[offset+4] == 0xff && pd[offset+5] == 0xff ) {
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return capture_ipx(pd,offset+4,len, cpinfo, pseudo_header);
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} else {
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return capture_llc(pd,offset+4,len, cpinfo, pseudo_header);
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}
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}
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return try_capture_dissector("ethertype", encap_proto, pd, offset+4, len, cpinfo, pseudo_header);
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}
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static void
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columns_set_vlan(column_info *cinfo, guint16 tci)
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{
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static const char fast_str[][2] = { "0", "1", "2", "3", "4", "5", "6", "7" };
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char id_str[16];
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guint32_to_str_buf(tci & 0xFFF, id_str, sizeof(id_str));
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col_add_lstr(cinfo, COL_INFO,
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"PRI: ", fast_str[(tci >> 13) & 7], " "
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"CFI: ", fast_str[(tci >> 12) & 1], " "
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"ID: ", id_str,
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COL_ADD_LSTR_TERMINATOR);
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col_add_str(cinfo, COL_8021Q_VLAN_ID, id_str);
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}
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static int
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dissect_vlan(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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proto_item *ti;
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guint16 tci, vlan_id;
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guint16 encap_proto;
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gboolean is_802_2;
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proto_tree *vlan_tree;
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proto_item *item;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "VLAN");
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col_clear(pinfo->cinfo, COL_INFO);
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tci = tvb_get_ntohs( tvb, 0 );
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vlan_id = tci & 0xFFF;
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/* Add the VLAN Id if it's the first one*/
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if (pinfo->vlan_id == 0) {
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pinfo->vlan_id = vlan_id;
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}
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columns_set_vlan(pinfo->cinfo, tci);
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vlan_tree = NULL;
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if (tree) {
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ti = proto_tree_add_item(tree, hfi_vlan, tvb, 0, 4, ENC_NA);
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if (vlan_summary_in_tree) {
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proto_item_append_text(ti, ", PRI: %u, CFI: %u, ID: %u",
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(tci >> 13), ((tci >> 12) & 1), vlan_id);
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}
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vlan_tree = proto_item_add_subtree(ti, ett_vlan);
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proto_tree_add_item(vlan_tree, &hfi_vlan_priority, tvb, 0, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(vlan_tree, &hfi_vlan_cfi, tvb, 0, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(vlan_tree, &hfi_vlan_id, tvb, 0, 2, ENC_BIG_ENDIAN);
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if (gbl_resolv_flags.vlan_name) {
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item = proto_tree_add_string(vlan_tree, &hfi_vlan_id_name, tvb, 0, 2,
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get_vlan_name(wmem_packet_scope(), vlan_id));
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PROTO_ITEM_SET_GENERATED(item);
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}
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}
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encap_proto = tvb_get_ntohs(tvb, 2);
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if (encap_proto <= IEEE_802_3_MAX_LEN) {
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/* Is there an 802.2 layer? I can tell by looking at the first 2
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bytes after the VLAN header. If they are 0xffff, then what
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follows the VLAN header is an IPX payload, meaning no 802.2.
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(IPX/SPX is they only thing that can be contained inside a
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straight 802.3 packet, so presumably the same applies for
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Ethernet VLAN packets). A non-0xffff value means that there's an
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802.2 layer inside the VLAN layer */
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is_802_2 = TRUE;
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/* Don't throw an exception for this check (even a BoundsError) */
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if (tvb_captured_length_remaining(tvb, 4) >= 2) {
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if (tvb_get_ntohs(tvb, 4) == 0xffff) {
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is_802_2 = FALSE;
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}
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}
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dissect_802_3(encap_proto, is_802_2, tvb, 4, pinfo, tree, vlan_tree,
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hfi_vlan_len.id, hfi_vlan_trailer.id, &ei_vlan_len, 0);
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} else {
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ethertype_data_t ethertype_data;
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ethertype_data.etype = encap_proto;
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ethertype_data.offset_after_ethertype = 4;
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ethertype_data.fh_tree = vlan_tree;
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ethertype_data.etype_id = hfi_vlan_etype.id;
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ethertype_data.trailer_id = hfi_vlan_trailer.id;
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ethertype_data.fcs_len = 0;
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call_dissector_with_data(ethertype_handle, tvb, pinfo, tree, ðertype_data);
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}
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return tvb_captured_length(tvb);
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}
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void
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proto_register_vlan(void)
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{
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#ifndef HAVE_HFI_SECTION_INIT
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static header_field_info *hfi[] = {
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&hfi_vlan_priority,
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&hfi_vlan_cfi,
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&hfi_vlan_id,
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&hfi_vlan_id_name,
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&hfi_vlan_etype,
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&hfi_vlan_len,
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&hfi_vlan_trailer,
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};
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#endif /* HAVE_HFI_SECTION_INIT */
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static gint *ett[] = {
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&ett_vlan
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};
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static ei_register_info ei[] = {
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{ &ei_vlan_len, { "vlan.len.past_end", PI_MALFORMED, PI_ERROR, "Length field value goes past the end of the payload", EXPFILL }},
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};
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module_t *vlan_module;
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expert_module_t* expert_vlan;
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int proto_vlan;
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proto_vlan = proto_register_protocol("802.1Q Virtual LAN", "VLAN", "vlan");
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hfi_vlan = proto_registrar_get_nth(proto_vlan);
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proto_register_fields(proto_vlan, hfi, array_length(hfi));
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proto_register_subtree_array(ett, array_length(ett));
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expert_vlan = expert_register_protocol(proto_vlan);
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expert_register_field_array(expert_vlan, ei, array_length(ei));
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vlan_module = prefs_register_protocol(proto_vlan, proto_reg_handoff_vlan);
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prefs_register_bool_preference(vlan_module, "summary_in_tree",
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"Show vlan summary in protocol tree",
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"Whether the vlan summary line should be shown in the protocol tree",
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&vlan_summary_in_tree);
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prefs_register_uint_preference(vlan_module, "qinq_ethertype",
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"802.1QinQ Ethertype (in hex)",
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"The (hexadecimal) Ethertype used to indicate 802.1QinQ VLAN in VLAN tunneling.",
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16, &q_in_q_ethertype);
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vlan_handle = create_dissector_handle(dissect_vlan, proto_vlan);
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}
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void
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proto_reg_handoff_vlan(void)
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{
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static gboolean prefs_initialized = FALSE;
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static unsigned int old_q_in_q_ethertype;
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if (!prefs_initialized)
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{
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dissector_add_uint("ethertype", ETHERTYPE_VLAN, vlan_handle);
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register_capture_dissector("ethertype", ETHERTYPE_VLAN, capture_vlan, hfi_vlan->id);
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prefs_initialized = TRUE;
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}
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else
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{
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dissector_delete_uint("ethertype", old_q_in_q_ethertype, vlan_handle);
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}
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old_q_in_q_ethertype = q_in_q_ethertype;
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ethertype_handle = find_dissector_add_dependency("ethertype", hfi_vlan->id);
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dissector_add_uint("ethertype", q_in_q_ethertype, vlan_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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