forked from osmocom/wireshark
![Anders Broman](/assets/img/avatar_default.png)
gre - fix a length error, and change the way to display 3GPP atributes. svn path=/trunk/; revision=17757
560 lines
18 KiB
C
560 lines
18 KiB
C
/* packet-gre.c
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* Routines for the Generic Routing Encapsulation (GRE) protocol
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* Brad Robel-Forrest <brad.robel-forrest@watchguard.com>
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*
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* $Id$
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <glib.h>
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#include <epan/packet.h>
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#include "packet-wccp.h"
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#include <epan/in_cksum.h>
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#include <epan/etypes.h>
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#include <epan/greproto.h>
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#include <epan/ipproto.h>
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#include <epan/llcsaps.h>
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/*
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* See RFC 1701 "Generic Routing Encapsulation (GRE)", RFC 1702
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* "Generic Routing Encapsulation over IPv4 networks", RFC 2637
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* "Point-to-Point Tunneling Protocol (PPTP)", RFC 2784 "Generic
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* Routing Encapsulation (GRE)", RFC 2890 "Key and Sequence
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* Number Extensions to GRE" and draft-ietf-mpls-in-ip-or-gre-07.txt
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* "Encapsulating MPLS in IP or Generic Routing Encapsulation (GRE)".
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*/
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static int proto_gre = -1;
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static int hf_gre_proto = -1;
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static int hf_gre_key = -1;
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/* Ref 3GPP2 A.S0012-C v2.0 and A.S0008-A v1.0 */
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static int hf_gre_3ggp2_attrib_id =-1;
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static int hf_gre_3ggp2_attrib_length = -1;
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static int hf_gre_3ggp2_sdi = -1;
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static int hf_gre_3ggp2_fci = -1;
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static int hf_gre_3ggp2_di = -1;
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static int hf_gre_3ggp2_flow_disc = -1;
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static int hf_gre_3ggp2_seg = -1;
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static gint ett_gre = -1;
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static gint ett_gre_flags = -1;
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static gint ett_gre_wccp2_redirect_header = -1;
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static gint ett_3gpp2_attribs = -1;
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static gint ett_3gpp2_attr = -1;
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static dissector_table_t gre_dissector_table;
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static dissector_handle_t data_handle;
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/* bit positions for flags in header */
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#define GH_B_C 0x8000
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#define GH_B_R 0x4000
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#define GH_B_K 0x2000
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#define GH_B_S 0x1000
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#define GH_B_s 0x0800
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#define GH_B_RECUR 0x0700
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#define GH_P_A 0x0080 /* only in special PPTPized GRE header */
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#define GH_P_FLAGS 0x0078 /* only in special PPTPized GRE header */
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#define GH_R_FLAGS 0x00F8
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#define GH_B_VER 0x0007
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static void add_flags_and_ver(proto_tree *, guint16, tvbuff_t *, int, int);
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static void dissect_gre_wccp2_redirect_header(tvbuff_t *, int, proto_tree *);
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static const value_string typevals[] = {
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{ ETHERTYPE_PPP, "PPP" },
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{ ETHERTYPE_IP, "IP" },
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{ SAP_OSINL5, "OSI"},
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{ GRE_WCCP, "WCCP"},
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{ GRE_NHRP, "NHRP"},
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{ ETHERTYPE_IPX, "IPX"},
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{ ETHERTYPE_ETHBRIDGE, "Transparent Ethernet bridging" },
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{ ETHERTYPE_RAW_FR, "Frame Relay"},
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{ ETHERTYPE_IPv6, "IPv6" },
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{ ETHERTYPE_MPLS, "MPLS label switched packet" },
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{ ETHERTYPE_CDMA2000_A10_UBS,"CDMA2000 A10 Unstructured byte stream" },
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{ ETHERTYPE_3GPP2, "CDMA2000 A10 3GPP2 Packet" },
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{ 0, NULL }
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};
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#define ID_3GPP2_SDI_FLAG 1
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#define ID_3GPP2_FLOW_CTRL 2
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#define ID_3GPP2_FLOW_DISCRIMINATOR 3
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#define ID_3GPP2_SEG 4
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static const value_string gre_3ggp2_seg_vals[] = {
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{ 0x00, "Packet Started" },
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{ 0x01, "Packet continued" },
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{ 0x02, "Packet Ended" },
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{ 0, NULL }
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};
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/* 3GPP2 A.S0012-C v2.0
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* 2.6.1 GRE Attributes
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*/
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static const value_string gre_3ggp2_attrib_id_vals[] = {
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{ 0x01, "1x SDB/HRPD DOS Indicator" },
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{ 0x02, "Flow Control Indication" },
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/* A.S0008-A v1.0 */
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{ 0x03, "IP Flow Discriminator" },
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{ 0x04, "Segmentation Indication" },
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{ 0, NULL }
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};
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static const true_false_string gre_3ggp2_sdi_val = {
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"Packet suitable for 1x SDB or HRPD DOS transmission",
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"Reserved"
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};
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static const true_false_string gre_3ggp2_fci_val = {
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"XOFF",
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"XON"
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};
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static const true_false_string gre_3ggp2_di_val = {
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"INDEFINITE:",
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"TEMPORARY"
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};
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static int
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dissect_gre_3gpp2_attribs(tvbuff_t *tvb, int offset, proto_tree *tree)
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{
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gboolean last_attrib = FALSE;
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proto_item* attr_item;
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proto_tree* attr_tree;
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guint8 value;
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int start_offset = offset;
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proto_item* ti =
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proto_tree_add_text(tree, tvb, offset, 0, "3GPP2 Attributes");
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proto_tree* atree = proto_item_add_subtree(ti, ett_3gpp2_attribs);
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while(last_attrib != TRUE)
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{
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guint8 attrib_id = tvb_get_guint8(tvb, offset);
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guint8 attrib_length = tvb_get_guint8(tvb, offset + 1);
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attr_item = proto_tree_add_text(atree, tvb, offset, attrib_length + 1, "%s",
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val_to_str((attrib_id&0x7f), gre_3ggp2_attrib_id_vals, "%u (Unknown)"));
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attr_tree = proto_item_add_subtree(attr_item, ett_3gpp2_attr);
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proto_tree_add_item(attr_tree, hf_gre_3ggp2_attrib_id, tvb, offset, 1, FALSE);
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proto_tree_add_item(attr_tree, hf_gre_3ggp2_attrib_length, tvb, offset+1, 1, FALSE);
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offset += 2;
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last_attrib = (attrib_id & 0x80)?TRUE:FALSE;
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attrib_id &= 0x7F;
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switch(attrib_id)
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{
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case ID_3GPP2_FLOW_DISCRIMINATOR:
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{
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value = tvb_get_guint8(tvb,offset);
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proto_tree_add_item(attr_tree, hf_gre_3ggp2_flow_disc, tvb, offset, attrib_length, FALSE);
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proto_item_append_text(attr_item," - 0x%x",value);
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}
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break;
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case ID_3GPP2_SDI_FLAG:
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{
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value = tvb_get_guint8(tvb,offset);
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proto_tree_add_item(attr_tree, hf_gre_3ggp2_sdi, tvb, offset, attrib_length, FALSE);
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proto_item_append_text(attr_item," - %s",
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(value & 0x80) ? "Packet suitable for 1x SDB or HRPD DOS transmission" : "Reserved");
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}
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break;
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case ID_3GPP2_SEG:
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{
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value = tvb_get_guint8(tvb,offset) >>6;
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proto_tree_add_item(attr_tree, hf_gre_3ggp2_seg, tvb, offset, attrib_length, FALSE);
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proto_item_append_text(attr_item," - %s",val_to_str(value, gre_3ggp2_seg_vals, "0x%02X - Unknown"));
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}
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break;
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case ID_3GPP2_FLOW_CTRL:
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{
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value = tvb_get_guint8(tvb,offset);
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proto_tree_add_item(attr_tree, hf_gre_3ggp2_fci, tvb, offset, attrib_length, FALSE);
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proto_item_append_text(attr_item," - %s",
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(value & 0x80) ? "XON" : "XOFF");
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proto_tree_add_item(attr_tree, hf_gre_3ggp2_di, tvb, offset, attrib_length, FALSE);
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proto_item_append_text(attr_item,"/%s",
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(value & 0x40) ? "INDEFINITE" : "TEMPORARY");
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}
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break;
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}
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offset += attrib_length;
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}
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proto_item_set_len(ti, offset - start_offset);
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return offset;
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}
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static void
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dissect_gre(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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int offset = 0;
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guint16 flags_and_ver;
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guint16 type;
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gboolean is_ppp = FALSE;
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gboolean is_wccp2 = FALSE;
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guint len = 4;
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proto_item *ti;
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proto_tree *gre_tree = NULL;
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guint16 sre_af;
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guint8 sre_length;
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tvbuff_t *next_tvb;
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flags_and_ver = tvb_get_ntohs(tvb, offset);
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type = tvb_get_ntohs(tvb, offset + sizeof(flags_and_ver));
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "GRE");
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_add_fstr(pinfo->cinfo, COL_INFO, "Encapsulated %s",
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val_to_str(type, typevals, "0x%04X (unknown)"));
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}
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if (flags_and_ver & GH_B_C || flags_and_ver & GH_B_R)
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len += 4;
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if (flags_and_ver & GH_B_K)
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len += 4;
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if (flags_and_ver & GH_B_S)
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len += 4;
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switch (type) {
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case ETHERTYPE_PPP:
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if (flags_and_ver & GH_P_A)
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len += 4;
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is_ppp = TRUE;
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break;
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case ETHERTYPE_3GPP2:
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case ETHERTYPE_CDMA2000_A10_UBS:
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if (flags_and_ver & GH_P_A)
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len += 4;
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is_ppp = TRUE;
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break;
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case GRE_WCCP:
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/* WCCP2 puts an extra 4 octets into the header, but uses the same
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encapsulation type; if it looks as if the first octet of the packet
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isn't the beginning of an IPv4 header, assume it's WCCP2. */
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if ((tvb_get_guint8(tvb, offset + sizeof(flags_and_ver) + sizeof(type)) & 0xF0) != 0x40) {
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len += 4;
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is_wccp2 = TRUE;
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}
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break;
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}
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if (tree) {
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ti = proto_tree_add_protocol_format(tree, proto_gre, tvb, offset, len,
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"Generic Routing Encapsulation (%s)",
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val_to_str(type, typevals, "0x%04X - unknown"));
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gre_tree = proto_item_add_subtree(ti, ett_gre);
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add_flags_and_ver(gre_tree, flags_and_ver, tvb, offset, is_ppp);
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}
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offset += sizeof(flags_and_ver);
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if (tree) {
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proto_tree_add_uint(gre_tree, hf_gre_proto, tvb, offset, sizeof(type), type);
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}
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offset += sizeof(type);
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if (flags_and_ver & GH_B_C || flags_and_ver & GH_B_R) {
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if (tree) {
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guint length, reported_length;
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vec_t cksum_vec[1];
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guint16 cksum, computed_cksum;
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cksum = tvb_get_ntohs(tvb, offset);
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length = tvb_length(tvb);
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reported_length = tvb_reported_length(tvb);
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if ((flags_and_ver & GH_B_C) && !pinfo->fragmented
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&& length >= reported_length) {
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/* The Checksum Present bit is set, and the packet isn't part of a
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fragmented datagram and isn't truncated, so we can checksum it. */
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cksum_vec[0].ptr = tvb_get_ptr(tvb, 0, reported_length);
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cksum_vec[0].len = reported_length;
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computed_cksum = in_cksum(cksum_vec, 1);
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if (computed_cksum == 0) {
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proto_tree_add_text(gre_tree, tvb, offset, 2,
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"Checksum: 0x%04x [correct]", cksum);
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} else {
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proto_tree_add_text(gre_tree, tvb, offset, 2,
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"Checksum: 0x%04x [incorrect, should be 0x%04x]",
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cksum, in_cksum_shouldbe(cksum, computed_cksum));
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}
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} else {
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proto_tree_add_text(gre_tree, tvb, offset, 2,
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"Checksum: 0x%04x", cksum);
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}
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}
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offset += 2;
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}
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if (flags_and_ver & GH_B_C || flags_and_ver & GH_B_R) {
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if (tree) {
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proto_tree_add_text(gre_tree, tvb, offset, 2,
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"Offset: %u", tvb_get_ntohs(tvb, offset));
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}
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offset += 2;
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}
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if (flags_and_ver & GH_B_K) {
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if (is_ppp && type!=ETHERTYPE_CDMA2000_A10_UBS) {
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if (tree) {
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proto_tree_add_text(gre_tree, tvb, offset, 2,
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"Payload length: %u", tvb_get_ntohs(tvb, offset));
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}
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offset += 2;
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if (tree) {
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proto_tree_add_text(gre_tree, tvb, offset, 2,
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"Call ID: %u", tvb_get_ntohs(tvb, offset));
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}
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offset += 2;
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}
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else {
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if (tree)
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proto_tree_add_item(gre_tree, hf_gre_key, tvb, offset, 4, FALSE);
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offset += 4;
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}
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}
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if (flags_and_ver & GH_B_S) {
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if (tree) {
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proto_tree_add_text(gre_tree, tvb, offset, 4,
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"Sequence number: %u", tvb_get_ntohl(tvb, offset));
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}
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offset += 4;
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}
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if (is_ppp && flags_and_ver & GH_P_A) {
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if (tree) {
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proto_tree_add_text(gre_tree, tvb, offset, 4,
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"Acknowledgement number: %u", tvb_get_ntohl(tvb, offset));
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}
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offset += 4;
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}
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if (flags_and_ver & GH_B_R) {
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for (;;) {
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sre_af = tvb_get_ntohs(tvb, offset);
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if (tree) {
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proto_tree_add_text(gre_tree, tvb, offset, sizeof(guint16),
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"Address family: %u", sre_af);
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}
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offset += sizeof(guint16);
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if (tree) {
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proto_tree_add_text(gre_tree, tvb, offset, 1,
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"SRE offset: %u", tvb_get_guint8(tvb, offset));
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}
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offset += sizeof(guint8);
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sre_length = tvb_get_guint8(tvb, offset);
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if (tree) {
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proto_tree_add_text(gre_tree, tvb, offset, sizeof(guint8),
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"SRE length: %u", sre_length);
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}
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offset += sizeof(guint8);
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if (sre_af == 0 && sre_length == 0)
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break;
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offset += sre_length;
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}
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}
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if (type == GRE_WCCP) {
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if (is_wccp2) {
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if (tree)
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dissect_gre_wccp2_redirect_header(tvb, offset, gre_tree);
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offset += 4;
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}
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}
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if(type == ETHERTYPE_3GPP2) {
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offset = dissect_gre_3gpp2_attribs(tvb, offset, gre_tree);
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}
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/* If the S bit is not set, this packet might not have a payload, so
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check whether there's any data left, first.
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XXX - the S bit isn't in RFC 2784, which deprecates that bit
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and some other bits in RFC 1701 and says that they should be
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zero for RFC 2784-compliant GRE; as such, the absence of the
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S bit doesn't necessarily mean there's no payload. */
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if (!(flags_and_ver & GH_B_S)) {
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if (tvb_reported_length_remaining(tvb, offset) <= 0)
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return; /* no payload */
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}
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next_tvb = tvb_new_subset(tvb, offset, -1, -1);
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if (!dissector_try_port(gre_dissector_table, type, next_tvb, pinfo, tree))
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call_dissector(data_handle,next_tvb, pinfo, gre_tree);
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}
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static void
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add_flags_and_ver(proto_tree *tree, guint16 flags_and_ver, tvbuff_t *tvb,
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int offset, int is_ppp)
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{
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proto_item * ti;
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proto_tree * fv_tree;
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int nbits = sizeof(flags_and_ver) * 8;
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ti = proto_tree_add_text(tree, tvb, offset, 2,
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"Flags and version: %#04x", flags_and_ver);
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fv_tree = proto_item_add_subtree(ti, ett_gre_flags);
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proto_tree_add_text(fv_tree, tvb, offset, sizeof(flags_and_ver), "%s",
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decode_boolean_bitfield(flags_and_ver, GH_B_C, nbits,
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"Checksum", "No checksum"));
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proto_tree_add_text(fv_tree, tvb, offset, sizeof(flags_and_ver), "%s",
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decode_boolean_bitfield(flags_and_ver, GH_B_R, nbits,
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"Routing", "No routing"));
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proto_tree_add_text(fv_tree, tvb, offset, sizeof(flags_and_ver), "%s",
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decode_boolean_bitfield(flags_and_ver, GH_B_K, nbits,
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"Key", "No key"));
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proto_tree_add_text(fv_tree, tvb, offset, sizeof(flags_and_ver), "%s",
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|
decode_boolean_bitfield(flags_and_ver, GH_B_S, nbits,
|
|
"Sequence number", "No sequence number"));
|
|
proto_tree_add_text(fv_tree, tvb, offset, sizeof(flags_and_ver), "%s",
|
|
decode_boolean_bitfield(flags_and_ver, GH_B_s, nbits,
|
|
"Strict source route", "No strict source route"));
|
|
proto_tree_add_text(fv_tree, tvb, offset, sizeof(flags_and_ver), "%s",
|
|
decode_numeric_bitfield(flags_and_ver, GH_B_RECUR, nbits,
|
|
"Recursion control: %u"));
|
|
if (is_ppp) {
|
|
proto_tree_add_text(fv_tree, tvb, offset, sizeof(flags_and_ver), "%s",
|
|
decode_boolean_bitfield(flags_and_ver, GH_P_A, nbits,
|
|
"Acknowledgment number", "No acknowledgment number"));
|
|
proto_tree_add_text(fv_tree, tvb, offset, sizeof(flags_and_ver), "%s",
|
|
decode_numeric_bitfield(flags_and_ver, GH_P_FLAGS, nbits,
|
|
"Flags: %u"));
|
|
}
|
|
else {
|
|
proto_tree_add_text(fv_tree, tvb, offset, sizeof(flags_and_ver), "%s",
|
|
decode_numeric_bitfield(flags_and_ver, GH_R_FLAGS, nbits,
|
|
"Flags: %u"));
|
|
}
|
|
|
|
proto_tree_add_text(fv_tree, tvb, offset, sizeof(flags_and_ver), "%s",
|
|
decode_numeric_bitfield(flags_and_ver, GH_B_VER, nbits,
|
|
"Version: %u"));
|
|
}
|
|
|
|
static void
|
|
dissect_gre_wccp2_redirect_header(tvbuff_t *tvb, int offset, proto_tree *tree)
|
|
{
|
|
proto_item * ti;
|
|
proto_tree * rh_tree;
|
|
guint8 rh_flags;
|
|
|
|
ti = proto_tree_add_text(tree, tvb, offset, 4, "Redirect header");
|
|
rh_tree = proto_item_add_subtree(ti, ett_gre_wccp2_redirect_header);
|
|
|
|
rh_flags = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_text(rh_tree, tvb, offset, 1, "%s",
|
|
decode_boolean_bitfield(rh_flags, 0x80, 8,
|
|
"Dynamic service", "Well-known service"));
|
|
proto_tree_add_text(rh_tree, tvb, offset, 1, "%s",
|
|
decode_boolean_bitfield(rh_flags, 0x40, 8,
|
|
"Alternative bucket used", "Alternative bucket not used"));
|
|
|
|
proto_tree_add_text(rh_tree, tvb, offset + 1, 1, "Service ID: %s",
|
|
val_to_str(tvb_get_guint8(tvb, offset + 1), service_id_vals, "Unknown (0x%02X)"));
|
|
if (rh_flags & 0x40)
|
|
proto_tree_add_text(rh_tree, tvb, offset + 2, 1, "Alternative bucket index: %u",
|
|
tvb_get_guint8(tvb, offset + 2));
|
|
proto_tree_add_text(rh_tree, tvb, offset + 3, 1, "Primary bucket index: %u",
|
|
tvb_get_guint8(tvb, offset + 3));
|
|
}
|
|
|
|
void
|
|
proto_register_gre(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_gre_proto,
|
|
{ "Protocol Type", "gre.proto", FT_UINT16, BASE_HEX, VALS(typevals), 0x0,
|
|
"The protocol that is GRE encapsulated", HFILL }
|
|
},
|
|
{ &hf_gre_key,
|
|
{ "GRE Key", "gre.key", FT_UINT32, BASE_HEX, NULL, 0x0,
|
|
"", HFILL }
|
|
},
|
|
{ &hf_gre_3ggp2_attrib_id,
|
|
{ "Type", "gre.ggp2_attrib_id", FT_UINT8, BASE_HEX, VALS(gre_3ggp2_attrib_id_vals), 0x7f,
|
|
"Type", HFILL }
|
|
},
|
|
{ &hf_gre_3ggp2_attrib_length,
|
|
{ "Length", "gre.ggp2_attrib_length", FT_UINT8, BASE_HEX, NULL, 0x0,
|
|
"Length", HFILL }
|
|
},
|
|
{ &hf_gre_3ggp2_sdi,
|
|
{ "SDI/DOS", "gre.3ggp2_sdi", FT_BOOLEAN, 16, TFS(&gre_3ggp2_sdi_val), 0x8000,
|
|
"Short Data Indicator(SDI)/Data Over Signaling (DOS)", HFILL }
|
|
},
|
|
{ &hf_gre_3ggp2_fci,
|
|
{ "Flow Control Indicator", "gre.3ggp2_fci", FT_BOOLEAN, 16, TFS(&gre_3ggp2_fci_val), 0x8000,
|
|
"Flow Control Indicator", HFILL }
|
|
},
|
|
{ &hf_gre_3ggp2_di,
|
|
{ "Duration Indicator", "gre.3ggp2_di", FT_BOOLEAN, 16, TFS(&gre_3ggp2_di_val), 0x4000,
|
|
"Duration Indicator", HFILL }
|
|
},
|
|
{ &hf_gre_3ggp2_flow_disc,
|
|
{ "Flow ID", "gre.ggp2_flow_disc", FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
"Flow ID", HFILL }
|
|
},
|
|
{ &hf_gre_3ggp2_seg,
|
|
{ "Type", "gre.ggp2_3ggp2_seg", FT_UINT16, BASE_HEX, VALS(gre_3ggp2_seg_vals), 0xc000,
|
|
"Type", HFILL }
|
|
},
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_gre,
|
|
&ett_gre_flags,
|
|
&ett_gre_wccp2_redirect_header,
|
|
&ett_3gpp2_attribs,
|
|
&ett_3gpp2_attr,
|
|
};
|
|
|
|
proto_gre = proto_register_protocol("Generic Routing Encapsulation",
|
|
"GRE", "gre");
|
|
proto_register_field_array(proto_gre, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
/* subdissector code */
|
|
gre_dissector_table = register_dissector_table("gre.proto",
|
|
"GRE protocol type", FT_UINT16, BASE_HEX);
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_gre(void)
|
|
{
|
|
dissector_handle_t gre_handle;
|
|
|
|
gre_handle = create_dissector_handle(dissect_gre, proto_gre);
|
|
dissector_add("ip.proto", IP_PROTO_GRE, gre_handle);
|
|
data_handle = find_dissector("data");
|
|
}
|