/* packet-vlan.c
* Routines for VLAN 802.1Q ethernet header disassembly
*
- * $Id: packet-vlan.c,v 1.10 2000/04/16 22:59:37 guy Exp $
+ * $Id: packet-vlan.c,v 1.39 2002/04/24 06:03:34 guy Exp $
*
* Ethereal - Network traffic analyzer
- * By Gerald Combs <gerald@zing.org>
+ * By Gerald Combs <gerald@ethereal.com>
* Copyright 1998 Gerald Combs
- *
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
#endif
#include <glib.h>
-#include "packet.h"
+#include <epan/packet.h>
+#include "packet-ieee8023.h"
#include "packet-ipx.h"
#include "packet-llc.h"
+#include "packet-vlan.h"
#include "etypes.h"
static int proto_vlan = -1;
-static int hf_vlan_etype = -1;
static int hf_vlan_priority = -1;
-static int hf_vlan_id = -1;
static int hf_vlan_cfi = -1;
+static int hf_vlan_id = -1;
+static int hf_vlan_etype = -1;
+static int hf_vlan_len = -1;
+static int hf_vlan_trailer = -1;
static gint ett_vlan = -1;
void
-capture_vlan(const u_char *pd, int offset, packet_counts *ld ) {
- guint32 encap_proto;
- if ( !BYTES_ARE_IN_FRAME(offset,5) ) {
+capture_vlan(const u_char *pd, int offset, int len, packet_counts *ld ) {
+ guint16 encap_proto;
+ if ( !BYTES_ARE_IN_FRAME(offset,len,5) ) {
ld->other++;
return;
}
encap_proto = pntohs( &pd[offset+2] );
if ( encap_proto <= IEEE_802_3_MAX_LEN) {
if ( pd[offset+4] == 0xff && pd[offset+5] == 0xff ) {
- capture_ipx(pd,offset+4,ld);
+ capture_ipx(ld);
} else {
- capture_llc(pd,offset+4,ld);
+ capture_llc(pd,offset+4,len,ld);
}
} else {
- capture_ethertype(encap_proto, offset+4, pd, ld);
+ capture_ethertype(encap_proto, pd, offset+4, len, ld);
}
}
static void
-dissect_vlan(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
- proto_tree *ti, *vlan_tree = NULL;
+dissect_vlan(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+ proto_tree *ti;
guint16 tci,encap_proto;
+ volatile gboolean is_802_2;
+ proto_tree *volatile vlan_tree;
- if (!BYTES_ARE_IN_FRAME(offset, 2*sizeof(guint16))) {
- return;
- }
+ if (check_col(pinfo->cinfo, COL_PROTOCOL))
+ col_set_str(pinfo->cinfo, COL_PROTOCOL, "VLAN");
+ if (check_col(pinfo->cinfo, COL_INFO))
+ col_clear(pinfo->cinfo, COL_INFO);
- if (check_col(fd, COL_PROTOCOL))
- col_add_str(fd, COL_PROTOCOL, "VLAN");
+ tci = tvb_get_ntohs( tvb, 0 );
- tci = pntohs( &pd[offset] );
- encap_proto = pntohs( &pd[offset+2] );
-
- if (check_col(fd, COL_INFO)) {
- col_add_fstr(fd, COL_INFO, "PRI: %d CFI: %d ID: %d",
+ if (check_col(pinfo->cinfo, COL_INFO)) {
+ col_add_fstr(pinfo->cinfo, COL_INFO, "PRI: %d CFI: %d ID: %d",
(tci >> 13), ((tci >> 12) & 1), (tci & 0xFFF));
}
+ vlan_tree = NULL;
+
if (tree) {
- ti = proto_tree_add_item(tree, proto_vlan, offset, 4);
+ ti = proto_tree_add_item(tree, proto_vlan, tvb, 0, 4, FALSE);
vlan_tree = proto_item_add_subtree(ti, ett_vlan);
- proto_tree_add_item(vlan_tree, hf_vlan_priority, offset, 2, tci);
- proto_tree_add_item(vlan_tree, hf_vlan_cfi, offset, 2, tci);
- proto_tree_add_item(vlan_tree, hf_vlan_id, offset, 2, tci);
+ proto_tree_add_uint(vlan_tree, hf_vlan_priority, tvb, 0, 2, tci);
+ proto_tree_add_uint(vlan_tree, hf_vlan_cfi, tvb, 0, 2, tci);
+ proto_tree_add_uint(vlan_tree, hf_vlan_id, tvb, 0, 2, tci);
}
- if ( encap_proto <= IEEE_802_3_MAX_LEN) {
- if ( pd[offset+4] == 0xff && pd[offset+5] == 0xff ) {
- dissect_ipx(pd,offset+4,fd,tree);
- } else {
- dissect_llc(pd,offset+4,fd,tree);
+ encap_proto = tvb_get_ntohs(tvb, 2);
+ if (encap_proto <= IEEE_802_3_MAX_LEN) {
+ /* Is there an 802.2 layer? I can tell by looking at the first 2
+ bytes after the VLAN header. If they are 0xffff, then what
+ follows the VLAN header is an IPX payload, meaning no 802.2.
+ (IPX/SPX is they only thing that can be contained inside a
+ straight 802.3 packet, so presumably the same applies for
+ Ethernet VLAN packets). A non-0xffff value means that there's an
+ 802.2 layer inside the VLAN layer */
+ is_802_2 = TRUE;
+ TRY {
+ if (tvb_get_ntohs(tvb, 4) == 0xffff) {
+ is_802_2 = FALSE;
+ }
}
+ CATCH2(BoundsError, ReportedBoundsError) {
+ ; /* do nothing */
+
+ }
+ ENDTRY;
+
+ dissect_802_3(encap_proto, is_802_2, tvb, 4, pinfo, tree, vlan_tree,
+ hf_vlan_len, hf_vlan_trailer);
} else {
- ethertype(encap_proto, offset+4, pd, fd, tree, vlan_tree, hf_vlan_etype);
+ ethertype(encap_proto, tvb, 4, pinfo, tree, vlan_tree,
+ hf_vlan_etype, hf_vlan_trailer);
}
}
proto_register_vlan(void)
{
static hf_register_info hf[] = {
- { &hf_vlan_etype, {
- "Type", "vlan.etype", FT_UINT16, BASE_HEX,
- VALS(etype_vals), 0x0, "Type" }},
{ &hf_vlan_priority, {
"Priority", "vlan.priority", FT_UINT16, BASE_BIN,
- 0, 0xE000, "Priority" }},
+ 0, 0xE000, "Priority", HFILL }},
{ &hf_vlan_cfi, {
"CFI", "vlan.cfi", FT_UINT16, BASE_BIN,
- 0, 0x1000, "CFI" }},
+ 0, 0x1000, "CFI", HFILL }}, /* XXX - Boolean? */
{ &hf_vlan_id, {
"ID", "vlan.id", FT_UINT16, BASE_BIN,
- 0, 0x0FFF, "ID" }},
+ 0, 0x0FFF, "ID", HFILL }},
+ { &hf_vlan_etype, {
+ "Type", "vlan.etype", FT_UINT16, BASE_HEX,
+ VALS(etype_vals), 0x0, "Type", HFILL }},
+ { &hf_vlan_len, {
+ "Length", "vlan.len", FT_UINT16, BASE_DEC,
+ NULL, 0x0, "Length", HFILL }},
+ { &hf_vlan_trailer, {
+ "Trailer", "vlan.trailer", FT_BYTES, BASE_NONE,
+ NULL, 0x0, "VLAN Trailer", HFILL }}
};
static gint *ett[] = {
&ett_vlan,
};
- proto_vlan = proto_register_protocol("802.1q Virtual LAN", "vlan");
+ proto_vlan = proto_register_protocol("802.1q Virtual LAN", "VLAN", "vlan");
proto_register_field_array(proto_vlan, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_vlan(void)
{
- dissector_add("ethertype", ETHERTYPE_VLAN, dissect_vlan);
+ dissector_handle_t vlan_handle;
+
+ vlan_handle = create_dissector_handle(dissect_vlan, proto_vlan);
+ dissector_add("ethertype", ETHERTYPE_VLAN, vlan_handle);
}
git.samba.org / obnox / wireshark / wip.git / blobdiff