468 lines
18 KiB
C
468 lines
18 KiB
C
/* packet-ieee8021ah.c
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* Routines for 802.1ah 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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#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/addr_resolv.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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void proto_register_ieee8021ah(void);
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void proto_reg_handoff_ieee8021ah(void);
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static dissector_handle_t ethertype_handle;
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static capture_dissector_handle_t ipx_cap_handle;
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static capture_dissector_handle_t llc_cap_handle;
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void dissect_ieee8021ah_common(tvbuff_t *tvb, packet_info *pinfo,
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proto_tree *tree, proto_tree *parent, int tree_index);
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/* GLOBALS ************************************************************/
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/* ethertype for 802.1ah tag - encapsulating an Ethernet packet */
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static unsigned int ieee8021ah_ethertype = ETHERTYPE_IEEE_802_1AH;
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static int proto_ieee8021ah = -1;
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static int proto_ieee8021ad = -1;
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/* dot1ad B-tag fields */
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static int hf_ieee8021ad_priority = -1;
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static int hf_ieee8021ad_cfi = -1;
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static int hf_ieee8021ad_id = -1;
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static int hf_ieee8021ad_svid = -1;
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static int hf_ieee8021ad_cvid = -1;
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/* dot1ah C-tag fields */
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static int hf_ieee8021ah_priority = -1;
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static int hf_ieee8021ah_drop = -1; /* drop eligibility */
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static int hf_ieee8021ah_nca = -1; /* no customer addresses (c_daddr & c_saddr are 0) */
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static int hf_ieee8021ah_res1 = -1; /* 2 bits reserved; ignored on receive */
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static int hf_ieee8021ah_res2 = -1; /* 2 bits reserved; delete frame if non-zero */
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static int hf_ieee8021ah_isid = -1; /* I-SID */
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static int hf_ieee8021ah_c_daddr = -1; /* encapsulated customer dest addr */
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static int hf_ieee8021ah_c_saddr = -1; /* encapsulated customer src addr */
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static int hf_ieee8021ah_etype = -1;
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/* static int hf_ieee8021ah_len = -1; */
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static int hf_ieee8021ah_trailer = -1;
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static gint ett_ieee8021ah = -1;
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static gint ett_ieee8021ad = -1;
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#define IEEE8021AD_LEN 4
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#define IEEE8021AH_LEN 18
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#define IEEE8021AH_ISIDMASK 0x00FFFFFF
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/* FUNCTIONS ************************************************************/
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static gboolean
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capture_ieee8021ah(const guchar *pd, int offset, int len, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header _U_)
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{
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guint16 encap_proto;
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if (!BYTES_ARE_IN_FRAME(offset, len, IEEE8021AH_LEN + 1))
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return FALSE;
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encap_proto = pntoh16( &pd[offset + IEEE8021AH_LEN - 2] );
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if (encap_proto <= IEEE_802_3_MAX_LEN) {
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if ( pd[offset + IEEE8021AH_LEN] == 0xff
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&& pd[offset + IEEE8021AH_LEN + 1] == 0xff ) {
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return call_capture_dissector(ipx_cap_handle, pd, offset + IEEE8021AH_LEN, len, cpinfo, pseudo_header);
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}
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else {
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return call_capture_dissector(llc_cap_handle, pd, offset + IEEE8021AH_LEN, 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 + IEEE8021AH_LEN, len, cpinfo, pseudo_header);
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}
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/* Dissector *************************************************************/
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static
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int dissect_ieee8021ad(tvbuff_t *tvb, packet_info *pinfo,
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proto_tree *tree, void* data _U_)
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{
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proto_tree *ptree = NULL;
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proto_tree *tagtree = NULL;
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guint32 tci, ctci;
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guint16 encap_proto;
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int proto_tree_index;
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ethertype_data_t ethertype_data;
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tvbuff_t *next_tvb = NULL;
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proto_tree *ieee8021ad_tree;
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proto_tree *ieee8021ad_tag_tree;
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/* set tree index */
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proto_tree_index = proto_ieee8021ad;
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/* add info to column display */
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "802.1ad");
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col_clear(pinfo->cinfo, COL_INFO);
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tci = tvb_get_ntohs( tvb, 0 );
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col_add_fstr(pinfo->cinfo, COL_INFO,
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"PRI: %d DROP: %d ID: %d",
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(tci >> 13), ((tci >> 12) & 1), (tci & 0xFFF));
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/* create the protocol tree */
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ptree = proto_tree_add_item(tree, proto_tree_index, tvb, 0, IEEE8021AD_LEN, ENC_NA);
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ieee8021ad_tree = proto_item_add_subtree(ptree, ett_ieee8021ad);
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encap_proto = tvb_get_ntohs(tvb, IEEE8021AD_LEN - 2);
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ethertype_data.fh_tree = ieee8021ad_tree;
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ethertype_data.etype_id = hf_ieee8021ah_etype;
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ethertype_data.trailer_id = hf_ieee8021ah_trailer;
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ethertype_data.fcs_len = 0;
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/* If it's a 1ah frame, create subtree for B-Tag, rename overall
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tree to 802.1ah, pass to 1ah dissector */
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if (encap_proto == ETHERTYPE_IEEE_802_1AH) {
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if (tree) {
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tagtree = proto_tree_add_item(ptree, proto_tree_index, tvb, 0, 2, ENC_NA);
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ieee8021ad_tag_tree = proto_item_add_subtree(tagtree, ett_ieee8021ad);
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/* add fields */
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proto_tree_add_uint(ieee8021ad_tag_tree, hf_ieee8021ad_priority, tvb,
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0, 1, tci);
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proto_tree_add_uint(ieee8021ad_tag_tree, hf_ieee8021ad_cfi, tvb, 0, 1, tci);
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proto_tree_add_uint(ieee8021ad_tag_tree, hf_ieee8021ad_id, tvb, 0, 2, tci);
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/* set label of B-tag subtree */
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proto_item_set_text(ieee8021ad_tag_tree, "B-Tag, B-VID: %d", tci & 0x0FFF);
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}
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next_tvb = tvb_new_subset_remaining(tvb, IEEE8021AD_LEN);
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if (ptree) {
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/* add bvid to label */
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proto_item_set_text(ptree, "IEEE 802.1ah, B-VID: %d", tci & 0x0FFF);
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dissect_ieee8021ah_common(next_tvb, pinfo, ptree, tree, proto_tree_index);
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}
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else {
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dissect_ieee8021ah_common(next_tvb, pinfo, tree, NULL, proto_tree_index);
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}
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} else if (encap_proto == ETHERTYPE_IEEE_802_1AD) {
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/* two VLAN tags (i.e. Q-in-Q) */
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ctci = tvb_get_ntohs(tvb, IEEE8021AD_LEN);
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if (tree) {
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/* add fields */
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proto_tree_add_uint(ieee8021ad_tree, hf_ieee8021ad_priority, tvb,
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0, 1, tci);
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proto_tree_add_uint(ieee8021ad_tree, hf_ieee8021ad_cfi, tvb, 0, 1, tci);
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proto_tree_add_uint(ieee8021ad_tree, hf_ieee8021ad_svid, tvb, 0, 2, tci);
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proto_tree_add_uint(ieee8021ad_tree, hf_ieee8021ad_priority, tvb,
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IEEE8021AD_LEN, 1, ctci);
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proto_tree_add_uint(ieee8021ad_tree, hf_ieee8021ad_cfi, tvb,
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IEEE8021AD_LEN, 1, ctci);
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proto_tree_add_uint(ieee8021ad_tree, hf_ieee8021ad_cvid, tvb, IEEE8021AD_LEN,
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2, ctci);
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}
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proto_item_set_text(ptree, "IEEE 802.1ad, S-VID: %d, C-VID: %d", tci & 0x0FFF,
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ctci & 0x0FFF);
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ethertype_data.etype = tvb_get_ntohs(tvb, IEEE8021AD_LEN * 2 - 2);
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ethertype_data.offset_after_ethertype = IEEE8021AD_LEN * 2;
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/* 802.1ad tags are always followed by an ethertype; call next
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dissector based on ethertype */
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call_dissector_with_data(ethertype_handle, tvb, pinfo, tree, ðertype_data);
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} else {
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/* Something else (shouldn't really happen, but we'll support it anyways) */
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if (tree) {
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/* add fields */
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proto_tree_add_uint(ieee8021ad_tree, hf_ieee8021ad_priority, tvb,
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0, 1, tci);
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proto_tree_add_uint(ieee8021ad_tree, hf_ieee8021ad_cfi, tvb, 0, 1, tci);
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proto_tree_add_uint(ieee8021ad_tree, hf_ieee8021ad_id, tvb, 0, 2, tci);
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}
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/* label should be 802.1ad not .1ah */
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proto_item_set_text(ptree, "IEEE 802.1ad, ID: %d", tci & 0x0FFF);
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ethertype_data.etype = encap_proto;
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ethertype_data.offset_after_ethertype = IEEE8021AD_LEN;
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/* 802.1ad tags are always followed by an ethertype; call next
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dissector based on ethertype */
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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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dissect_ieee8021ah_common(tvbuff_t *tvb, packet_info *pinfo,
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proto_tree *tree, proto_tree *parent, int tree_index) {
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guint32 tci;
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guint16 encap_proto;
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proto_tree *ptree;
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ethertype_data_t ethertype_data;
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proto_tree *ieee8021ah_tag_tree;
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tci = tvb_get_ntohl( tvb, 0 );
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col_add_fstr(pinfo->cinfo, COL_INFO,
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"PRI: %d Drop: %d NCA: %d Res1: %d Res2: %d I-SID: %d",
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(tci >> 29), ((tci >> 28) & 1), ((tci >> 27) & 1),
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((tci >> 26) & 1), ((tci >> 24) & 3), tci & IEEE8021AH_ISIDMASK);
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/* create the protocol tree */
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ptree = NULL;
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ieee8021ah_tag_tree = NULL;
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if (tree) {
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/* 802.1ah I-Tag */
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ptree = proto_tree_add_item(tree, tree_index, tvb, 0, 4, ENC_NA);
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ieee8021ah_tag_tree = proto_item_add_subtree(ptree, ett_ieee8021ah);
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/* add fields */
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proto_tree_add_uint(ieee8021ah_tag_tree, hf_ieee8021ah_priority, tvb,
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0, 1, tci);
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proto_tree_add_uint(ieee8021ah_tag_tree, hf_ieee8021ah_drop, tvb, 0, 1, tci);
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proto_tree_add_uint(ieee8021ah_tag_tree, hf_ieee8021ah_nca, tvb, 0, 1, tci);
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proto_tree_add_uint(ieee8021ah_tag_tree, hf_ieee8021ah_res1, tvb, 0, 1, tci);
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proto_tree_add_uint(ieee8021ah_tag_tree, hf_ieee8021ah_res2, tvb, 0, 1, tci);
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proto_tree_add_uint(ieee8021ah_tag_tree, hf_ieee8021ah_isid, tvb, 1, 3, tci);
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proto_item_set_text(ieee8021ah_tag_tree, "I-Tag, I-SID: %d",
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tci & IEEE8021AH_ISIDMASK);
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proto_tree_add_item(tree, hf_ieee8021ah_c_daddr, tvb, 4, 6, ENC_NA);
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proto_tree_add_item(tree, hf_ieee8021ah_c_saddr, tvb, 10, 6, ENC_NA);
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/* add text to 802.1ad label */
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if (parent) {
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proto_item_append_text(tree, ", I-SID: %d, C-Src: %s, C-Dst: %s",
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tci & IEEE8021AH_ISIDMASK,
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tvb_address_with_resolution_to_str(wmem_packet_scope(), tvb, AT_ETHER, 10),
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tvb_address_with_resolution_to_str(wmem_packet_scope(), tvb, AT_ETHER, 4));
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}
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}
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encap_proto = tvb_get_ntohs(tvb, IEEE8021AH_LEN - 2);
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/* 802.1ah I-tags are always followed by an ethertype; call next
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dissector based on ethertype */
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/* If this was preceded by a 802.1ad tag, must pass original tree
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to next dissector, not 802.1ad tree */
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ethertype_data.etype = encap_proto;
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ethertype_data.fh_tree = tree;
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ethertype_data.offset_after_ethertype = IEEE8021AH_LEN;
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ethertype_data.etype_id = hf_ieee8021ah_etype;
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ethertype_data.trailer_id = hf_ieee8021ah_trailer;
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ethertype_data.fcs_len = 0;
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if (parent) {
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call_dissector_with_data(ethertype_handle, tvb, pinfo, parent, ðertype_data);
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}
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else {
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call_dissector_with_data(ethertype_handle, tvb, pinfo, tree, ðertype_data);
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}
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}
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static
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int dissect_ieee8021ah(tvbuff_t *tvb, packet_info *pinfo,
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proto_tree *tree, void* data _U_)
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{
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proto_item *pi;
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guint32 tci;
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int proto_tree_index;
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proto_tree *ieee8021ah_tree;
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/* set tree index */
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proto_tree_index = proto_ieee8021ah;
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/* add info to column display */
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "802.1ah");
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col_clear(pinfo->cinfo, COL_INFO);
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tci = tvb_get_ntohl( tvb, 0 );
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col_add_fstr(pinfo->cinfo, COL_INFO,
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"PRI: %d Drop: %d NCA: %d Res1: %d Res2: %d I-SID: %d",
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(tci >> 29), ((tci >> 28) & 1), ((tci >> 27) & 1),
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((tci >> 26) & 1), ((tci >> 24) & 3), (tci & 0x00FFFFFF));
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pi = proto_tree_add_item(tree, proto_tree_index, tvb, 0, IEEE8021AH_LEN, ENC_NA);
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ieee8021ah_tree = proto_item_add_subtree(pi, ett_ieee8021ah);
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if (ieee8021ah_tree) {
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dissect_ieee8021ah_common(tvb, pinfo, ieee8021ah_tree, tree, proto_tree_index);
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} else {
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dissect_ieee8021ah_common(tvb, pinfo, tree, NULL, proto_tree_index);
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}
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return tvb_captured_length(tvb);
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}
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/* Protocol Registration **************************************************/
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void
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proto_register_ieee8021ah(void)
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{
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static hf_register_info hf[] = {
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{ &hf_ieee8021ah_priority, {
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"Priority", "ieee8021ah.priority", FT_UINT32, BASE_DEC,
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0, 0xE0000000, NULL, HFILL }},
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{ &hf_ieee8021ah_drop, {
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"DROP", "ieee8021ah.drop", FT_UINT32, BASE_DEC,
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0, 0x10000000, NULL, HFILL }},
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{ &hf_ieee8021ah_nca, {
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"NCA", "ieee8021ah.nca", FT_UINT32, BASE_DEC,
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0, 0x08000000, "No Customer Addresses", HFILL }},
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{ &hf_ieee8021ah_res1, {
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"RES1", "ieee8021ah.res1", FT_UINT32, BASE_DEC,
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0, 0x04000000, "Reserved1", HFILL }},
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{ &hf_ieee8021ah_res2, {
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"RES2", "ieee8021ah.res2", FT_UINT32, BASE_DEC,
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0, 0x03000000, "Reserved2", HFILL }},
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{ &hf_ieee8021ah_isid, {
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"I-SID", "ieee8021ah.isid", FT_UINT32, BASE_DEC,
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0, 0x00FFFFFF, NULL, HFILL }},
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{ &hf_ieee8021ah_c_daddr, {
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"C-Destination", "ieee8021ah.cdst", FT_ETHER, BASE_NONE,
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NULL, 0x0, "Customer Destination Address", HFILL }},
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{ &hf_ieee8021ah_c_saddr, {
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"C-Source", "ieee8021ah.csrc", FT_ETHER, BASE_NONE,
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NULL, 0x0, "Customer Source Address", HFILL }},
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{ &hf_ieee8021ah_etype, {
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"Type", "ieee8021ah.etype", FT_UINT16, BASE_HEX,
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VALS(etype_vals), 0x0, NULL, HFILL }},
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#if 0
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{ &hf_ieee8021ah_len, {
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"Length", "ieee8021ah.len", FT_UINT16, BASE_DEC,
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NULL, 0x0, NULL, HFILL }},
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#endif
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{ &hf_ieee8021ah_trailer, {
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"Trailer", "ieee8021ah.trailer", FT_BYTES, BASE_NONE,
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NULL, 0x0, "802.1ah Trailer", HFILL }}
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};
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static hf_register_info hf_1ad[] = {
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{ &hf_ieee8021ad_priority, {
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"Priority", "ieee8021ad.priority", FT_UINT16, BASE_DEC,
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0, 0xE000, NULL, HFILL }},
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{ &hf_ieee8021ad_cfi, {
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"DEI", "ieee8021ad.dei", FT_UINT16, BASE_DEC,
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0, 0x1000, "Drop Eligibility", HFILL }},
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{ &hf_ieee8021ad_id, {
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"ID", "ieee8021ad.id", FT_UINT16, BASE_DEC,
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0, 0x0FFF, "Vlan ID", HFILL }},
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{ &hf_ieee8021ad_svid, {
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"ID", "ieee8021ad.svid", FT_UINT16, BASE_DEC,
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0, 0x0FFF, "S-Vlan ID", HFILL }},
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{ &hf_ieee8021ad_cvid, {
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"ID", "ieee8021ad.cvid", FT_UINT16, BASE_DEC,
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0, 0x0FFF, "C-Vlan ID", HFILL }},
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};
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static gint *ett[] = {
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&ett_ieee8021ah,
|
|
&ett_ieee8021ad
|
|
};
|
|
|
|
|
|
module_t *ieee8021ah_module;
|
|
|
|
/* registration */
|
|
/* dot1ah */
|
|
proto_ieee8021ah = proto_register_protocol("IEEE 802.1ah", "IEEE 802.1AH",
|
|
"ieee8021ah");
|
|
proto_register_field_array(proto_ieee8021ah, hf, array_length(hf));
|
|
|
|
proto_ieee8021ad = proto_register_protocol("IEEE 802.1ad", "IEEE 802.1AD",
|
|
"ieee8021ad");
|
|
proto_register_field_array(proto_ieee8021ad, hf_1ad, array_length(hf_1ad));
|
|
|
|
/* register subtree array for both */
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
/* add a user preference to set the 802.1ah ethertype */
|
|
ieee8021ah_module = prefs_register_protocol(proto_ieee8021ah,
|
|
proto_reg_handoff_ieee8021ah);
|
|
prefs_register_uint_preference(ieee8021ah_module, "8021ah_ethertype",
|
|
"802.1ah Ethertype (in hex)",
|
|
"(Hexadecimal) Ethertype used to indicate IEEE 802.1ah tag.",
|
|
16, &ieee8021ah_ethertype);
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_ieee8021ah(void)
|
|
{
|
|
static gboolean prefs_initialized = FALSE;
|
|
static dissector_handle_t ieee8021ah_handle;
|
|
static unsigned int old_ieee8021ah_ethertype;
|
|
static capture_dissector_handle_t ieee8021ah_cap_handle;
|
|
|
|
if (!prefs_initialized){
|
|
dissector_handle_t ieee8021ad_handle;
|
|
ieee8021ah_handle = create_dissector_handle(dissect_ieee8021ah,
|
|
proto_ieee8021ah);
|
|
ieee8021ad_handle = create_dissector_handle(dissect_ieee8021ad,
|
|
proto_ieee8021ad);
|
|
dissector_add_uint("ethertype", ETHERTYPE_IEEE_802_1AD, ieee8021ad_handle);
|
|
ethertype_handle = find_dissector_add_dependency("ethertype", proto_ieee8021ah);
|
|
find_dissector_add_dependency("ethertype", proto_ieee8021ad);
|
|
ieee8021ah_cap_handle = create_capture_dissector_handle(capture_ieee8021ah, proto_ieee8021ah);
|
|
capture_dissector_add_uint("ethertype", ETHERTYPE_IEEE_802_1AD, ieee8021ah_cap_handle);
|
|
capture_dissector_add_uint("ethertype", ETHERTYPE_IEEE_802_1AH, ieee8021ah_cap_handle);
|
|
|
|
prefs_initialized = TRUE;
|
|
}
|
|
else {
|
|
dissector_delete_uint("ethertype", old_ieee8021ah_ethertype, ieee8021ah_handle);
|
|
}
|
|
|
|
old_ieee8021ah_ethertype = ieee8021ah_ethertype;
|
|
dissector_add_uint("ethertype", ieee8021ah_ethertype, ieee8021ah_handle);
|
|
|
|
ipx_cap_handle = find_capture_dissector("ipx");
|
|
llc_cap_handle = find_capture_dissector("llc");
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 4
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=4 tabstop=8 expandtab:
|
|
* :indentSize=4:tabSize=8:noTabs=true:
|
|
*/
|