--- /dev/null
+/* packet-babel.c
+ * Routines for Babel dissection (RFC 6126)
+ * Copyright 2011 by Juliusz Chroboczek <jch@pps.jussieu.fr>
+ *
+ * $Id$
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <glib.h>
+
+#include <epan/packet.h>
+#include <epan/prefs.h>
+
+#include <stdio.h>
+
+void proto_reg_handoff_babel(void);
+
+static int proto_babel = -1;
+
+static gint ett_babel = -1;
+static int hf_babel_magic = -1;
+static int hf_babel_version = -1;
+static int hf_babel_bodylen = -1;
+
+static int hf_babel_message = -1;
+static gint ett_message = -1;
+static int hf_babel_message_type = -1;
+static int hf_babel_message_length = -1;
+static int hf_babel_message_nonce = -1;
+static int hf_babel_message_interval = -1;
+static int hf_babel_message_seqno = -1;
+static int hf_babel_message_ae = -1;
+static int hf_babel_message_prefix = -1;
+static int hf_babel_message_rxcost = -1;
+static int hf_babel_message_routerid = -1;
+static int hf_babel_message_flags = -1;
+static int hf_babel_message_plen = -1;
+static int hf_babel_message_omitted = -1;
+static int hf_babel_message_metric = -1;
+static int hf_babel_message_hopcount = -1;
+
+static gint ett_subtree = -1;
+
+#define UDP_PORT_BABEL 6697
+
+#define MESSAGE_PAD1 0
+#define MESSAGE_PADN 1
+#define MESSAGE_ACK_REQ 2
+#define MESSAGE_ACK 3
+#define MESSAGE_HELLO 4
+#define MESSAGE_IHU 5
+#define MESSAGE_ROUTER_ID 6
+#define MESSAGE_NH 7
+#define MESSAGE_UPDATE 8
+#define MESSAGE_REQUEST 9
+#define MESSAGE_MH_REQUEST 10
+
+static const value_string messages[] = {
+ { MESSAGE_PAD1, "pad1"},
+ { MESSAGE_PADN, "padn"},
+ { MESSAGE_ACK_REQ, "ack-req"},
+ { MESSAGE_ACK, "ack"},
+ { MESSAGE_HELLO, "hello"},
+ { MESSAGE_IHU, "ihu"},
+ { MESSAGE_ROUTER_ID, "router-id"},
+ { MESSAGE_NH, "nh"},
+ { MESSAGE_UPDATE, "update"},
+ { MESSAGE_REQUEST, "request"},
+ { MESSAGE_MH_REQUEST, "mh-request"},
+ { 0, NULL}
+};
+
+static const value_string aes[] = {
+ { 0, "Wildcard" },
+ { 1, "IPv4" },
+ { 2, "IPv6" },
+ { 3, "Link-Local IPv6"},
+ { 0, NULL }
+};
+
+/* The prefix for v6-mapped IPv4 addresses. Format_address below
+ returns IPv4 addresses in that format. */
+
+static const unsigned char v4prefix[16] =
+ {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF, 0, 0, 0, 0 };
+
+/* The following two functions return ephemeral or constant strings, no
+ need to call free. */
+
+static const char *
+format_address(const unsigned char *prefix)
+{
+ if(prefix == NULL)
+ return "corrupt";
+ else if(memcmp(prefix, v4prefix, 12) == 0)
+ return ip_to_str(prefix + 12);
+ else
+ return ip6_to_str((const struct e_in6_addr*)prefix);
+}
+
+const char *
+format_prefix(const unsigned char *prefix, unsigned char plen)
+{
+ return ep_strdup_printf("%s/%u", format_address(prefix), plen);
+}
+
+static int
+network_prefix(int ae, int plen, unsigned int omitted,
+ const unsigned char *p, const unsigned char *dp,
+ unsigned int len, unsigned char *p_r)
+{
+ unsigned pb;
+ unsigned char prefix[16];
+
+ if(plen >= 0)
+ pb = (plen + 7) / 8;
+ else if(ae == 1)
+ pb = 4;
+ else
+ pb = 16;
+
+ if(pb > 16)
+ return -1;
+
+ memset(prefix, 0, 16);
+
+ switch(ae) {
+ case 0: break;
+ case 1:
+ if(omitted > 4 || pb > 4 || (pb > omitted && len < pb - omitted))
+ return -1;
+ memcpy(prefix, v4prefix, 12);
+ if(omitted) {
+ if (dp == NULL) return -1;
+ memcpy(prefix, dp, 12 + omitted);
+ }
+ if(pb > omitted) memcpy(prefix + 12 + omitted, p, pb);
+ break;
+ case 2:
+ if(omitted > 16 || (pb > omitted && len < pb - omitted))
+ return -1;
+ if(omitted) {
+ if (dp == NULL) return -1;
+ memcpy(prefix, dp, omitted);
+ }
+ if(pb > omitted) memcpy(prefix + omitted, p, pb - omitted);
+ break;
+ case 3:
+ if(pb > 8 && len < pb - 8) return -1;
+ prefix[0] = 0xfe;
+ prefix[1] = 0x80;
+ if(pb > 8) memcpy(prefix + 8, p, pb - 8);
+ break;
+ default:
+ return -1;
+ }
+
+ memcpy(p_r, prefix, 16);
+ return 1;
+}
+
+static int
+network_address(int ae, const unsigned char *a, unsigned int len,
+ unsigned char *a_r)
+{
+ return network_prefix(ae, -1, 0, a, NULL, len, a_r);
+}
+
+static int
+dissect_babel(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+ proto_item *ti;
+ unsigned char v4_prefix[16] = {0}, v6_prefix[16] = {0};
+ int i = 0;
+ proto_tree *babel_tree = NULL;
+ guint8 version;
+ guint16 bodylen;
+
+ if(tvb_length(tvb) < 4)
+ return 0;
+
+ if(tvb_get_guint8(tvb, 0) != 42)
+ return 0;
+ version = tvb_get_guint8(tvb, 1);
+
+ col_set_str(pinfo->cinfo, COL_PROTOCOL, "Babel");
+ col_set_str(pinfo->cinfo, COL_INFO, "Babel");
+
+ if(version != 2) {
+ col_add_fstr(pinfo->cinfo, COL_INFO, "Version %u", version);
+ return 2;
+ }
+
+ if(tree) {
+ ti = proto_tree_add_item(tree, proto_babel, tvb, 0, -1, ENC_NA);
+ babel_tree = proto_item_add_subtree(ti, ett_babel);
+
+ proto_tree_add_item(babel_tree, hf_babel_magic, tvb, 0, 1, ENC_NA);
+ proto_tree_add_item(babel_tree, hf_babel_version, tvb, 1, 1, ENC_NA);
+ proto_tree_add_item(babel_tree, hf_babel_bodylen,
+ tvb, 2, 2, ENC_BIG_ENDIAN);
+ }
+
+ bodylen = tvb_get_ntohs(tvb, 2);
+
+ i = 0;
+ while(i < bodylen) {
+ guint8 type, len = 0, total_length;
+ proto_tree *message_tree = NULL;
+ int message = 4 + i;
+
+ type = tvb_get_guint8(tvb, message);
+ if(type == MESSAGE_PAD1)
+ total_length = 1;
+ else {
+ len = tvb_get_guint8(tvb, message + 1);
+ total_length = len + 2;
+ }
+
+ col_append_fstr(pinfo->cinfo, COL_INFO, " %s",
+ val_to_str(type, messages, "unknown"));
+
+ ti = proto_tree_add_uint_format(babel_tree, hf_babel_message,
+ tvb, message, total_length, type,
+ "Message %s (%u)",
+ val_to_str(type, messages,
+ "unknown"),
+ type);
+
+ if(tree) {
+ message_tree = proto_item_add_subtree(ti, ett_message);
+ proto_tree_add_item(message_tree, hf_babel_message_type,
+ tvb, message, 1, ENC_NA);
+ }
+
+ if(type == MESSAGE_PAD1) {
+ i++;
+ continue;
+ }
+
+ if(tree) {
+ proto_tree_add_item(message_tree, hf_babel_message_length,
+ tvb, message + 1, 1, ENC_BIG_ENDIAN);
+
+ if(type == MESSAGE_PADN) {
+ } else if(type == MESSAGE_ACK_REQ) {
+ proto_tree_add_item(message_tree, hf_babel_message_nonce,
+ tvb, message + 4, 2, ENC_BIG_ENDIAN);
+ proto_tree_add_item(message_tree, hf_babel_message_interval,
+ tvb, message + 6, 2, ENC_BIG_ENDIAN);
+ } else if(type == MESSAGE_ACK) {
+ proto_tree_add_item(message_tree, hf_babel_message_nonce,
+ tvb, message + 2, 2, ENC_BIG_ENDIAN);
+ } else if(type == MESSAGE_HELLO) {
+ proto_tree_add_item(message_tree, hf_babel_message_seqno,
+ tvb, message + 4, 2, ENC_BIG_ENDIAN);
+ proto_tree_add_item(message_tree, hf_babel_message_interval,
+ tvb, message + 6, 2, ENC_BIG_ENDIAN);
+ } else if(type == MESSAGE_IHU) {
+ proto_tree *subtree;
+ unsigned char address[16];
+ int rc =
+ network_address(tvb_get_guint8(tvb, message + 2),
+ tvb_get_ptr(tvb, message + 8, len - 6),
+ len - 6,
+ address);
+ proto_tree_add_item(message_tree, hf_babel_message_rxcost,
+ tvb, message + 4, 2, ENC_BIG_ENDIAN);
+ proto_tree_add_item(message_tree, hf_babel_message_interval,
+ tvb, message + 6, 2, ENC_BIG_ENDIAN);
+ ti = proto_tree_add_text(message_tree,
+ tvb, message + 4, len - 2,
+ "Address: %s",
+ format_address(rc < 0 ?
+ NULL : address));
+ subtree = proto_item_add_subtree(ti, ett_subtree);
+ proto_tree_add_item(subtree, hf_babel_message_ae,
+ tvb, message + 2, 1, ENC_NA);
+ proto_tree_add_item(subtree, hf_babel_message_prefix,
+ tvb, message + 4, len - 2, ENC_NA);
+ } else if(type == MESSAGE_ROUTER_ID) {
+ proto_tree_add_item(message_tree, hf_babel_message_routerid,
+ tvb, message + 4, 8, ENC_NA);
+ } else if(type == MESSAGE_NH) {
+ proto_tree *subtree;
+ unsigned char nh[16];
+ int rc =
+ network_address(tvb_get_guint8(tvb, message + 2),
+ tvb_get_ptr(tvb, message + 4, len - 2),
+ len - 2,
+ nh);
+ ti = proto_tree_add_text(message_tree,
+ tvb, message + 4, len - 2,
+ "NH: %s",
+ format_address(rc < 0 ? NULL : nh));
+ subtree = proto_item_add_subtree(ti, ett_subtree);
+ proto_tree_add_item(subtree, hf_babel_message_ae,
+ tvb, message + 2, 1, ENC_NA);
+ proto_tree_add_item(subtree, hf_babel_message_prefix,
+ tvb, message + 4, len - 2, ENC_NA);
+ } else if(type == MESSAGE_UPDATE) {
+ proto_tree *subtree;
+ unsigned char p[16];
+ guint8 ae = tvb_get_guint8(tvb, message + 2);
+ guint8 flags = tvb_get_guint8(tvb, message + 3);
+ guint8 plen = tvb_get_guint8(tvb, message + 4);
+ int rc =
+ network_prefix(ae, plen,
+ tvb_get_guint8(tvb, message + 5),
+ tvb_get_ptr(tvb, message + 12, len - 10),
+ ae == 1 ? v4_prefix : v6_prefix,
+ len - 10, p);
+ if(rc >= 0 && (flags & 0x80)) {
+ if(ae == 1)
+ memcpy(v4_prefix, p, 16);
+ else
+ memcpy(v6_prefix, p, 16);
+ }
+
+ proto_tree_add_item(message_tree, hf_babel_message_flags,
+ tvb, message + 3, 1, ENC_NA);
+ proto_tree_add_item(message_tree, hf_babel_message_interval,
+ tvb, message + 6, 2, ENC_BIG_ENDIAN);
+ proto_tree_add_item(message_tree, hf_babel_message_seqno,
+ tvb, message + 8, 2, ENC_BIG_ENDIAN);
+ proto_tree_add_item(message_tree, hf_babel_message_metric,
+ tvb, message + 10, 2, ENC_BIG_ENDIAN);
+ ti = proto_tree_add_text(message_tree,
+ tvb, message + 12, len - 10,
+ "Prefix: %s",
+ format_prefix(rc < 0 ? NULL : p,
+ plen));
+ subtree = proto_item_add_subtree(ti, ett_subtree);
+ proto_tree_add_item(subtree, hf_babel_message_ae,
+ tvb, message + 2, 1, ENC_NA);
+ proto_tree_add_item(subtree, hf_babel_message_plen,
+ tvb, message + 4, 1, ENC_NA);
+ proto_tree_add_item(subtree, hf_babel_message_omitted,
+ tvb, message + 5, 1, ENC_NA);
+ proto_tree_add_item(subtree, hf_babel_message_prefix,
+ tvb, message + 12, len - 10, ENC_NA);
+ } else if(type == MESSAGE_REQUEST) {
+ proto_tree *subtree;
+ unsigned char p[16];
+ guint8 plen = tvb_get_guint8(tvb, message + 3);
+ int rc =
+ network_prefix(tvb_get_guint8(tvb, message + 2), plen,
+ 0,
+ tvb_get_ptr(tvb, message + 4, len - 2),
+ NULL,
+ len - 2, p);
+ ti = proto_tree_add_text(message_tree,
+ tvb, message + 4, len - 2,
+ "Prefix: %s",
+ format_prefix(rc < 0 ? NULL : p,
+ plen));
+ subtree = proto_item_add_subtree(ti, ett_subtree);
+ proto_tree_add_item(subtree, hf_babel_message_ae,
+ tvb, message + 2, 1, ENC_NA);
+ proto_tree_add_item(subtree, hf_babel_message_plen,
+ tvb, message + 3, 1, ENC_NA);
+ proto_tree_add_item(subtree, hf_babel_message_prefix,
+ tvb, message + 4, len - 2, ENC_NA);
+ } else if(type == MESSAGE_MH_REQUEST) {
+ proto_tree *subtree;
+ unsigned char p[16];
+ guint8 plen = tvb_get_guint8(tvb, message + 3);
+ int rc =
+ network_prefix(tvb_get_guint8(tvb, message + 2), plen,
+ 0,
+ tvb_get_ptr(tvb, message + 16, len - 14),
+ NULL,
+ len - 14, p);
+ proto_tree_add_item(message_tree, hf_babel_message_seqno,
+ tvb, message + 4, 2, ENC_BIG_ENDIAN);
+ proto_tree_add_item(message_tree, hf_babel_message_hopcount,
+ tvb, message + 6, 1, ENC_NA);
+ proto_tree_add_item(message_tree, hf_babel_message_routerid,
+ tvb, message + 8, 8, ENC_NA);
+ ti = proto_tree_add_text(message_tree,
+ tvb, message + 16, len - 14,
+ "Prefix: %s",
+ format_prefix(rc < 0 ? NULL : p,
+ plen));
+ subtree = proto_item_add_subtree(ti, ett_subtree);
+ proto_tree_add_item(subtree, hf_babel_message_ae,
+ tvb, message + 2, 1, ENC_NA);
+ proto_tree_add_item(subtree, hf_babel_message_plen,
+ tvb, message + 3, 1, ENC_NA);
+ proto_tree_add_item(subtree, hf_babel_message_prefix,
+ tvb, message + 16, len - 14, ENC_NA);
+ }
+ }
+ i += len + 2;
+ }
+ return i;
+}
+
+void
+proto_register_babel(void)
+{
+ static hf_register_info hf[] = {
+ { &hf_babel_magic,
+ { "Magic", "babel.magic", FT_UINT8, BASE_DEC,
+ NULL, 0, "Magic value 42", HFILL }
+ },
+ { &hf_babel_version,
+ { "Version", "babel.version", FT_UINT8, BASE_DEC,
+ NULL, 0, "Version of the Babel protocol", HFILL }
+ },
+ { &hf_babel_bodylen,
+ { "Body Length", "babel.bodylen", FT_UINT16, BASE_DEC,
+ NULL, 0, NULL, HFILL }
+ },
+ { &hf_babel_message,
+ { "Message", "babel.message", FT_UINT8, BASE_DEC,
+ NULL, 0, "Babel Message", HFILL }
+ },
+ { &hf_babel_message_type,
+ { "Message Type", "babel.message.type", FT_UINT8, BASE_DEC,
+ VALS(messages), 0, NULL, HFILL }
+ },
+ { &hf_babel_message_length,
+ { "Message Length", "babel.message.length", FT_UINT8, BASE_DEC,
+ NULL, 0, NULL, HFILL }
+ },
+ { &hf_babel_message_nonce,
+ { "Nonce", "babel.message.nonce", FT_UINT16, BASE_HEX,
+ NULL, 0, NULL, HFILL }
+ },
+ { &hf_babel_message_interval,
+ { "Interval", "babel.message.interval", FT_UINT16, BASE_DEC,
+ NULL, 0, "Interval (in centiseconds)", HFILL }
+ },
+ { &hf_babel_message_seqno,
+ { "Seqno", "babel.message.seqno", FT_UINT16, BASE_HEX,
+ NULL, 0, NULL, HFILL }
+ },
+ { &hf_babel_message_ae,
+ { "Address Encoding", "babel.message.ae", FT_UINT8, BASE_DEC,
+ VALS(aes), 0, NULL, HFILL }
+ },
+ { &hf_babel_message_prefix,
+ { "Raw Prefix", "babel.message.prefix", FT_BYTES, BASE_NONE,
+ NULL, 0, NULL, HFILL }
+ },
+ { &hf_babel_message_rxcost,
+ { "Rxcost", "babel.message.rxcost", FT_UINT16, BASE_HEX,
+ NULL, 0, "Rxcost (from the point of vue of the sender)", HFILL }
+ },
+ { &hf_babel_message_routerid,
+ { "Router ID", "babel.message.routerid", FT_BYTES, BASE_NONE,
+ NULL, 0, NULL, HFILL }
+ },
+ { &hf_babel_message_flags,
+ { "Flags", "babel.message.flags", FT_UINT8, BASE_HEX,
+ NULL, 0, NULL, HFILL }
+ },
+ { &hf_babel_message_plen,
+ { "Prefix Length", "babel.message.plen", FT_UINT8, BASE_DEC,
+ NULL, 0, NULL, HFILL }
+ },
+ { &hf_babel_message_omitted,
+ { "Omitted Bytes", "babel.message.omitted", FT_UINT8, BASE_DEC,
+ NULL, 0, "Number of bytes omitted from the prefix", HFILL }
+ },
+ { &hf_babel_message_metric,
+ { "Metric", "babel.message.metric", FT_UINT16, BASE_DEC,
+ NULL, 0, NULL, HFILL }
+ },
+ { &hf_babel_message_hopcount,
+ { "Hop Count", "babel.message.omitted", FT_UINT8, BASE_DEC,
+ NULL, 0, NULL, HFILL }
+ },
+ };
+
+ static gint *ett[] = {
+ &ett_babel,
+ &ett_message,
+ &ett_subtree,
+ };
+
+ module_t *babel_module;
+
+ proto_babel =
+ proto_register_protocol("Babel Routing Protocol", "Babel", "babel");
+
+ proto_register_field_array(proto_babel, hf, array_length(hf));
+ proto_register_subtree_array(ett, array_length(ett));
+
+ babel_module = prefs_register_protocol(proto_babel,
+ proto_reg_handoff_babel);
+}
+
+void
+proto_reg_handoff_babel(void)
+{
+ dissector_handle_t babel_handle;
+
+ babel_handle = new_create_dissector_handle(dissect_babel, proto_babel);
+ dissector_add_uint("udp.port", UDP_PORT_BABEL, babel_handle);
+}
git.samba.org / obnox / wireshark / wip.git / commitdiff