Move dissectors to epan/dissectors directory.

[obnox/wireshark/wip.git] / epan / dissectors / packet-diffserv-mpls-common.c

diff --git a/epan/dissectors/packet-diffserv-mpls-common.c b/epan/dissectors/packet-diffserv-mpls-common.c
new file mode 100644 (file)
index 0000000..7491854
--- /dev/null
+++ b/epan/dissectors/packet-diffserv-mpls-common.c
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+/* packet-diffserv-mpls-common.c
+ * Routines for the common part of Diffserv MPLS signaling protocols
+ * Author: Endoh Akira (endoh@netmarks.co.jp)
+ *
+ * $Id$
+ *
+ * Ethereal - Network traffic analyzer
+ * 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
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+/*
+ * This module defines routines only for the common part of LDP
+ * and RSVP to support for Diffserv MPLS as described in RFC 3270
+ * and RFC 3140. Protocol specific routines of each signaling
+ * protocol are defined in each dissector.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <glib.h>
+#include <epan/packet.h>
+#include "packet-diffserv-mpls-common.h"
+
+#define hf_map         *hfindexes[0]
+#define hf_exp         *hfindexes[1]
+#define hf_phbid       *hfindexes[2]
+#define hf_phbid_dscp  *hfindexes[3]
+#define hf_phbid_code  *hfindexes[4]
+#define hf_phbid_bit14 *hfindexes[5]
+#define hf_phbid_bit15 *hfindexes[6]
+#define ett_map        *etts[0]
+#define ett_map_phbid  *etts[1]
+
+const value_string phbid_bit14_vals[] = {
+    {0, "Single PHB"},
+    {1, "Set of PHBs"},
+    {0, NULL}
+};
+
+const value_string phbid_bit15_vals[] = {
+    {0, "PHBs defined by standards action"},
+    {1, "PHBs not defined by standards action"},
+    {0, NULL}
+};
+
+void
+dissect_diffserv_mpls_common(tvbuff_t *tvb, proto_tree *tree, int type, 
+                            int offset, int **hfindexes, gint **etts)
+{
+    proto_item  *ti = NULL, *sub_ti;
+    proto_tree  *tree2 = NULL, *phbid_subtree;
+    int exp;
+    guint16 phbid;
+
+    switch (type) {
+    case 1:  /* E-LSP */
+       ti = proto_tree_add_item(tree, hf_map, tvb, offset, 4, FALSE);
+       tree2 = proto_item_add_subtree(ti, ett_map);
+       proto_item_set_text(ti, "MAP: ");
+       offset ++;
+       exp = tvb_get_guint8(tvb, offset) & 7;
+       proto_tree_add_uint(tree2, hf_exp, tvb, offset, 1, exp);
+       proto_item_append_text(ti, "EXP %u, ", exp);
+       offset ++;
+       break;
+    case 2:  /* L-LSP */
+       tree2 = tree;
+       break;
+    default:
+       return;
+    }
+
+    /* PHBID subtree */
+    sub_ti = proto_tree_add_item(tree2, hf_phbid, tvb, offset, 2, FALSE);
+    phbid_subtree = proto_item_add_subtree(sub_ti, ett_map_phbid);
+    proto_item_set_text(sub_ti, "%s: ", (type == 1) ? "PHBID" : "PSC");
+    phbid = tvb_get_ntohs(tvb, offset);
+
+    if ((phbid & 1) == 0) {
+       /* Case 1 of RFC 3140 */
+       proto_tree_add_uint(phbid_subtree, hf_phbid_dscp,
+                           tvb, offset, 2, phbid);
+       if (type == 1)
+           proto_item_append_text(ti, "DSCP %u", phbid >> 10);
+       proto_item_append_text(sub_ti, "DSCP %u", phbid >> 10);
+    }
+    else {
+       /* Case 2 of RFC 3140 */
+       proto_tree_add_uint(phbid_subtree, hf_phbid_code,
+                           tvb, offset, 2, phbid);
+       if (type == 1)
+           proto_item_append_text(ti, "PHB id code %u", phbid >> 4);
+       proto_item_append_text(sub_ti, "PHB id code %u", phbid >> 4);
+    }
+    proto_tree_add_uint(phbid_subtree, hf_phbid_bit14, tvb, offset, 2, phbid);
+    proto_tree_add_uint(phbid_subtree, hf_phbid_bit15, tvb, offset, 2, phbid);
+}