![Guy Harris](/assets/img/avatar_default.png)
add code to check it - I've no idea what's going on with the other captures where it's not correct, but those captures have a different (and apparently incorrect) checksum for packets with the *exact same contents* (other than the checksum) as the PIM packet in the capture where the checksum is correct, so perhaps those packets actually had bad checksums. svn path=/trunk/; revision=3004
676 lines
18 KiB
C
676 lines
18 KiB
C
/* packet-pim.c
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* Routines for PIM disassembly
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* (c) Copyright Jun-ichiro itojun Hagino <itojun@itojun.org>
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*
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* $Id: packet-pim.c,v 1.24 2001/02/08 08:38:58 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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* Copyright 1998 Gerald Combs
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*
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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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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.h>
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#endif
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#include <string.h>
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#include <glib.h>
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#ifdef NEED_SNPRINTF_H
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# include "snprintf.h"
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#endif
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#include "packet.h"
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#include "packet-ip.h"
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#include "packet-ipv6.h"
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#include "in_cksum.h"
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#define PIM_TYPE(x) ((x) & 0x0f)
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#define PIM_VER(x) (((x) & 0xf0) >> 4)
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enum pimv2_addrtype {
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pimv2_unicast, pimv2_group, pimv2_source
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};
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static int proto_pim = -1;
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static int hf_pim_version = -1;
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static int hf_pim_type = -1;
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static int hf_pim_cksum = -1;
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static gint ett_pim = -1;
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static dissector_handle_t ip_handle;
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/*
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* Address family values.
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*/
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#define PIM_AF_RESERVED 0
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#define PIM_AF_IP 1 /* IPv4 */
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#define PIM_AF_IPV6 2 /* IPv6 */
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#define PIM_AF_NSAP 3 /* NSAP */
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#define PIM_AF_HDLC 4 /* HDLC (8-bit multidrop) */
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#define PIM_AF_BBN_1822 5 /* BBN 1822 */
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#define PIM_AF_802 6 /* 802 (D/I/X Ethernet, 802.x, FDDI) */
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#define PIM_AF_E_163 7 /* E.163 */
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#define PIM_AF_E_164 8 /* E.164 (SMDS, Frame Relay, ATM) */
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#define PIM_AF_F_69 9 /* F.69 (Telex) */
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#define PIM_AF_X_121 10 /* X.121 (X.25, Frame Relay) */
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#define PIM_AF_IPX 11 /* IPX */
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#define PIM_AF_ATALK 12 /* Appletalk */
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#define PIM_AF_DECNET_IV 13 /* DECnet Phase IV */
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#define PIM_AF_VINES 14 /* Banyan Vines */
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#define PIM_AF_E_164_NSAP 15 /* E.164 with NSAP format subaddress */
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static const char *
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dissect_pim_addr(tvbuff_t *tvb, int offset, enum pimv2_addrtype at,
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int *advance) {
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static char buf[512];
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guint8 af;
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guint8 et;
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guint8 flags;
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guint8 mask_len;
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int len = 0;
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af = tvb_get_guint8(tvb, offset);
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if (af != PIM_AF_IP && af != PIM_AF_IPV6) {
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/*
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* We don't handle the other formats, and addresses don't include
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* a length field, so we can't even show them as raw bytes.
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*/
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return NULL;
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}
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et = tvb_get_guint8(tvb, offset + 1);
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if (et != 0) {
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/*
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* The only defined encoding type is 0, for the native encoding;
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* again, as addresses don't include a length field, we can't
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* even show addresses with a different encoding type as raw
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* bytes.
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*/
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return NULL;
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}
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switch (at) {
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case pimv2_unicast:
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switch (af) {
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case PIM_AF_IP:
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len = 4;
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(void)snprintf(buf, sizeof(buf), "%s",
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ip_to_str(tvb_get_ptr(tvb, offset + 2, len)));
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break;
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case PIM_AF_IPV6:
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len = 16;
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(void)snprintf(buf, sizeof(buf), "%s",
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ip6_to_str((struct e_in6_addr *)tvb_get_ptr(tvb, offset + 2, len)));
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break;
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}
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if (advance)
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*advance = 2 + len;
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break;
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case pimv2_group:
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mask_len = tvb_get_guint8(tvb, offset + 3);
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switch (af) {
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case PIM_AF_IP:
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len = 4;
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(void)snprintf(buf, sizeof(buf), "%s/%u",
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ip_to_str(tvb_get_ptr(tvb, offset + 4, len)), mask_len);
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break;
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case PIM_AF_IPV6:
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len = 16;
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(void)snprintf(buf, sizeof(buf), "%s/%u",
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ip6_to_str((struct e_in6_addr *)tvb_get_ptr(tvb, offset + 4, len)), mask_len);
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break;
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}
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if (advance)
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*advance = 4 + len;
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break;
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case pimv2_source:
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flags = tvb_get_guint8(tvb, offset + 2);
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mask_len = tvb_get_guint8(tvb, offset + 3);
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switch (af) {
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case PIM_AF_IP:
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len = 4;
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(void)snprintf(buf, sizeof(buf), "%s/%u",
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ip_to_str(tvb_get_ptr(tvb, offset + 4, len)), mask_len);
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break;
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case PIM_AF_IPV6:
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len = 16;
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(void)snprintf(buf, sizeof(buf), "%s/%u",
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ip6_to_str((struct e_in6_addr *)tvb_get_ptr(tvb, offset + 4, len)), mask_len);
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break;
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}
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if (flags) {
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(void)snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
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" (%s%s%s)",
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flags & 0x04 ? "S" : "",
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flags & 0x02 ? "W" : "",
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flags & 0x01 ? "R" : "");
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}
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if (advance)
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*advance = 4 + len;
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break;
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default:
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return NULL;
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}
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return buf;
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}
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static void
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dissect_pim(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) {
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int offset = 0;
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guint8 pim_typever;
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guint length, pim_length;
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guint16 pim_cksum, computed_cksum;
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vec_t cksum_vec[1];
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static const value_string type1vals[] = {
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{ 0, "Query" },
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{ 1, "Register" },
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{ 2, "Register-stop" },
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{ 3, "Join/Prune" },
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{ 4, "RP-Reachable" },
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{ 5, "Assert" },
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{ 6, "Graft" },
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{ 7, "Graft-Ack" },
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{ 8, "Mode" },
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{ 0, NULL },
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};
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static const value_string type2vals[] = {
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{ 0, "Hello" },
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{ 1, "Register" },
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{ 2, "Register-stop" },
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{ 3, "Join/Prune" },
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{ 4, "Bootstrap" },
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{ 5, "Assert" },
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{ 6, "Graft" },
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{ 7, "Graft-Ack" },
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{ 8, "Candidate-RP-Advertisement" },
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{ 0, NULL },
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};
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char *typestr;
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proto_tree *pim_tree = NULL;
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proto_item *ti;
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proto_tree *pimopt_tree = NULL;
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proto_item *tiopt;
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if (check_col(pinfo->fd, COL_PROTOCOL))
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col_set_str(pinfo->fd, COL_PROTOCOL, "PIM");
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if (check_col(pinfo->fd, COL_INFO))
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col_clear(pinfo->fd, COL_INFO);
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pim_typever = tvb_get_guint8(tvb, 0);
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switch (PIM_VER(pim_typever)) {
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case 1:
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typestr = val_to_str(PIM_TYPE(pim_typever), type1vals, "Unknown");
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break;
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case 2:
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typestr = val_to_str(PIM_TYPE(pim_typever), type2vals, "Unknown");
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break;
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default:
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typestr = "Unknown";
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break;
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}
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if (check_col(pinfo->fd, COL_PROTOCOL)) {
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col_add_fstr(pinfo->fd, COL_PROTOCOL, "PIM version %d",
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PIM_VER(pim_typever));
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}
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if (check_col(pinfo->fd, COL_INFO))
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col_add_fstr(pinfo->fd, COL_INFO, "%s", typestr);
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if (tree) {
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ti = proto_tree_add_item(tree, proto_pim, tvb, offset,
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tvb_length_remaining(tvb, offset), FALSE);
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pim_tree = proto_item_add_subtree(ti, ett_pim);
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proto_tree_add_uint(pim_tree, hf_pim_version, tvb, offset, 1,
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PIM_VER(pim_typever));
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proto_tree_add_uint_format(pim_tree, hf_pim_type, tvb, offset, 1,
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PIM_TYPE(pim_typever),
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"Type: %s (%u)", typestr, PIM_TYPE(pim_typever));
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pim_cksum = tvb_get_ntohs(tvb, offset + 2);
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length = tvb_length(tvb);
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if (PIM_VER(pim_typever) == 2) {
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/*
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* Well, it's PIM v2, so we can check whether this is a Register
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* mesage, and thus can figure out how much to checksum.
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*/
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if (PIM_TYPE(pim_typever) == 1) {
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/*
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* Register message - the PIM header is 8 bytes long.
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*/
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pim_length = 8;
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} else {
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/*
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* Other message - checksum the entire packet.
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*/
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pim_length = tvb_reported_length(tvb);
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}
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} else {
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/*
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* We don't know what type of message this is, so say that
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* the length is 0, to force it not to be checksummed.
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*/
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pim_length = 0;
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}
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if (!pinfo->fragmented && length >= pim_length) {
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/*
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* The packet isn't part of a fragmented datagram and isn't
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* truncated, so we can checksum it.
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*/
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cksum_vec[0].ptr = tvb_get_ptr(tvb, 0, pim_length);
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cksum_vec[0].len = pim_length;
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computed_cksum = in_cksum(&cksum_vec[0], 1);
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if (computed_cksum == 0) {
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proto_tree_add_uint_format(pim_tree, hf_pim_cksum, tvb,
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offset + 2, 2, pim_cksum,
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"Checksum: 0x%04x (correct)",
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pim_cksum);
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} else {
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proto_tree_add_uint_format(pim_tree, hf_pim_cksum, tvb,
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offset + 2, 2, pim_cksum,
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"Checksum: 0x%04x (incorrect, should be 0x%04x)",
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pim_cksum, in_cksum_shouldbe(pim_cksum, computed_cksum));
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}
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} else {
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proto_tree_add_uint(pim_tree, hf_pim_cksum, tvb,
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offset + 2, 2, pim_cksum);
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}
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offset += 4;
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if (tvb_reported_length_remaining(tvb, offset) > 0) {
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tiopt = proto_tree_add_text(pim_tree, tvb, offset,
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tvb_length_remaining(tvb, offset), "PIM parameters");
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pimopt_tree = proto_item_add_subtree(tiopt, ett_pim);
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} else
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goto done;
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if (PIM_VER(pim_typever) != 2)
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goto done;
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/* version 2 decoder */
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switch (PIM_TYPE(pim_typever)) {
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case 0: /*hello*/
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{
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while (tvb_reported_length_remaining(tvb, offset) >= 2) {
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if (tvb_get_ntohs(tvb, offset) == 1 &&
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tvb_get_ntohs(tvb, offset + 2) == 2) {
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guint16 holdtime;
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holdtime = tvb_get_ntohs(tvb, offset + 4);
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proto_tree_add_text(pimopt_tree, tvb, offset, 6,
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"Holdtime: %u%s", holdtime,
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holdtime == 0xffff ? " (infty)" : "");
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offset += 6;
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} else
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break;
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}
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break;
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}
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case 1: /* register */
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{
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guint32 flags;
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guint8 v_hl;
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tvbuff_t *next_tvb;
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const guint8 *next_pd;
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int next_offset;
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proto_tree *flag_tree = NULL;
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proto_item *tiflag;
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flags = tvb_get_ntohl(tvb, offset);
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tiflag = proto_tree_add_text(pimopt_tree, tvb, offset, 4,
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"Flags: 0x%08x", flags);
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flag_tree = proto_item_add_subtree(tiflag, ett_pim);
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proto_tree_add_text(flag_tree, tvb, offset, 1, "%s",
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decode_boolean_bitfield(flags, 0x80000000, 32,
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"Border", "Not border"));
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proto_tree_add_text(flag_tree, tvb, offset, 1, "%s",
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decode_boolean_bitfield(flags, 0x40000000, 32,
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"Null-Register", "Not Null-Register"));
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offset += 4;
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/*
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* The rest of the packet is a multicast data packet.
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*/
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next_tvb = tvb_new_subset(tvb, offset, -1, -1);
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/*
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* It's an IP packet - determine whether it's IPv4 or IPv6.
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*/
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v_hl = tvb_get_guint8(tvb, offset);
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switch((v_hl & 0xf0) >> 4) {
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case 4: /* IPv4 */
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#if 0
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call_dissector(ip_handle, next_tvb, pinfo, tree);
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#else
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call_dissector(ip_handle, next_tvb, pinfo, pimopt_tree);
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#endif
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break;
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case 6: /* IPv6 */
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tvb_compat(next_tvb, &next_pd, &next_offset);
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#if 0
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dissect_ipv6(next_pd, next_offset, pinfo->fd, tree);
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#else
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dissect_ipv6(next_pd, next_offset, pinfo->fd, pimopt_tree);
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#endif
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break;
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default:
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proto_tree_add_text(pimopt_tree, tvb,
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offset, tvb_length_remaining(tvb, offset),
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"Unknown IP version %d", (v_hl & 0xf0) >> 4);
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break;
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}
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break;
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}
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case 2: /* register-stop */
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{
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int advance;
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const char *s;
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s = dissect_pim_addr(tvb, offset, pimv2_group, &advance);
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if (s == NULL)
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break;
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proto_tree_add_text(pimopt_tree, tvb, offset, advance, "Group: %s", s);
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offset += advance;
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s = dissect_pim_addr(tvb, offset, pimv2_unicast, &advance);
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if (s == NULL)
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break;
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proto_tree_add_text(pimopt_tree, tvb, offset, advance, "Source: %s", s);
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break;
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}
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case 3: /* join/prune */
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case 6: /* graft */
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case 7: /* graft-ack */
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{
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int advance;
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int off;
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const char *s;
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int ngroup, i, njoin, nprune, j;
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guint16 holdtime;
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proto_tree *grouptree = NULL;
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proto_item *tigroup;
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proto_tree *subtree = NULL;
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proto_item *tisub;
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if (PIM_TYPE(pim_typever) != 7) {
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/* not graft-ack */
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s = dissect_pim_addr(tvb, offset, pimv2_unicast, &advance);
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if (s == NULL)
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break;
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proto_tree_add_text(pimopt_tree, tvb, offset, advance,
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"Upstream-neighbor: %s", s);
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offset += advance;
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}
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offset += 1; /* skip reserved field */
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ngroup = tvb_get_guint8(tvb, offset);
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proto_tree_add_text(pimopt_tree, tvb, offset, 1,
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"Groups: %u", ngroup);
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offset += 1;
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if (PIM_TYPE(pim_typever) != 7) {
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/* not graft-ack */
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holdtime = tvb_get_ntohs(tvb, offset);
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proto_tree_add_text(pimopt_tree, tvb, offset, 2,
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"Holdtime: %u%s", holdtime,
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holdtime == 0xffff ? " (infty)" : "");
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}
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offset += 2;
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for (i = 0; i < ngroup; i++) {
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s = dissect_pim_addr(tvb, offset, pimv2_group, &advance);
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if (s == NULL)
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goto breakbreak3;
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tigroup = proto_tree_add_text(pimopt_tree, tvb, offset, advance,
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"Group %d: %s", i, s);
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grouptree = proto_item_add_subtree(tigroup, ett_pim);
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offset += advance;
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njoin = tvb_get_ntohs(tvb, offset);
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nprune = tvb_get_ntohs(tvb, offset + 2);
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tisub = proto_tree_add_text(grouptree, tvb, offset, 2,
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"Join: %d", njoin);
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subtree = proto_item_add_subtree(tisub, ett_pim);
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off = offset + 4;
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for (j = 0; j < nprune; j++) {
|
|
s = dissect_pim_addr(tvb, off, pimv2_source,
|
|
&advance);
|
|
if (s == NULL)
|
|
goto breakbreak3;
|
|
proto_tree_add_text(subtree, tvb, off, advance,
|
|
"IP address: %s", s);
|
|
off += advance;
|
|
}
|
|
|
|
tisub = proto_tree_add_text(grouptree, tvb, offset + 2, 2,
|
|
"Prune: %d", nprune);
|
|
subtree = proto_item_add_subtree(tisub, ett_pim);
|
|
for (j = 0; j < nprune; j++) {
|
|
s = dissect_pim_addr(tvb, off, pimv2_source,
|
|
&advance);
|
|
if (s == NULL)
|
|
goto breakbreak3;
|
|
proto_tree_add_text(subtree, tvb, off, advance,
|
|
"IP address: %s", s);
|
|
off += advance;
|
|
}
|
|
}
|
|
breakbreak3:
|
|
break;
|
|
}
|
|
|
|
case 4: /* bootstrap */
|
|
{
|
|
const char *s;
|
|
int advance;
|
|
int i, j;
|
|
int frpcnt;
|
|
guint16 holdtime;
|
|
proto_tree *grouptree = NULL;
|
|
proto_item *tigroup;
|
|
|
|
proto_tree_add_text(pimopt_tree, tvb, offset, 2,
|
|
"Fragment tag: 0x%04x", tvb_get_ntohs(tvb, offset));
|
|
offset += 2;
|
|
|
|
proto_tree_add_text(pimopt_tree, tvb, offset, 1,
|
|
"Hash mask len: %u", tvb_get_guint8(tvb, offset));
|
|
offset += 1;
|
|
proto_tree_add_text(pimopt_tree, tvb, offset, 1,
|
|
"BSR priority: %u", tvb_get_guint8(tvb, offset));
|
|
offset += 1;
|
|
|
|
s = dissect_pim_addr(tvb, offset, pimv2_unicast, &advance);
|
|
if (s == NULL)
|
|
break;
|
|
proto_tree_add_text(pimopt_tree, tvb, offset, advance, "BSR: %s", s);
|
|
offset += advance;
|
|
|
|
for (i = 0; tvb_reported_length_remaining(tvb, offset) > 0; i++) {
|
|
s = dissect_pim_addr(tvb, offset, pimv2_group, &advance);
|
|
if (s == NULL)
|
|
goto breakbreak4;
|
|
tigroup = proto_tree_add_text(pimopt_tree, tvb, offset, advance,
|
|
"Group %d: %s", i, s);
|
|
grouptree = proto_item_add_subtree(tigroup, ett_pim);
|
|
offset += advance;
|
|
|
|
proto_tree_add_text(grouptree, tvb, offset, 1,
|
|
"RP count: %u", tvb_get_guint8(tvb, offset));
|
|
offset += 1;
|
|
frpcnt = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_text(grouptree, tvb, offset, 1,
|
|
"FRP count: %u", frpcnt);
|
|
offset += 3;
|
|
|
|
for (j = 0; j < frpcnt; j++) {
|
|
s = dissect_pim_addr(tvb, offset, pimv2_unicast, &advance);
|
|
if (s == NULL)
|
|
goto breakbreak4;
|
|
proto_tree_add_text(grouptree, tvb, offset, advance,
|
|
"RP %d: %s", j, s);
|
|
offset += advance;
|
|
|
|
holdtime = tvb_get_ntohs(tvb, offset);
|
|
proto_tree_add_text(grouptree, tvb, offset, 2,
|
|
"Holdtime: %u%s", holdtime,
|
|
holdtime == 0xffff ? " (infty)" : "");
|
|
offset += 2;
|
|
proto_tree_add_text(grouptree, tvb, offset, 1,
|
|
"Priority: %u", tvb_get_guint8(tvb, offset));
|
|
offset += 2; /* also skips reserved field */
|
|
}
|
|
}
|
|
|
|
breakbreak4:
|
|
break;
|
|
}
|
|
|
|
case 5: /* assert */
|
|
{
|
|
const char *s;
|
|
int advance;
|
|
|
|
s = dissect_pim_addr(tvb, offset, pimv2_group, &advance);
|
|
if (s == NULL)
|
|
break;
|
|
proto_tree_add_text(pimopt_tree, tvb, offset, advance, "Group: %s", s);
|
|
offset += advance;
|
|
|
|
s = dissect_pim_addr(tvb, offset, pimv2_unicast, &advance);
|
|
if (s == NULL)
|
|
break;
|
|
proto_tree_add_text(pimopt_tree, tvb, offset, advance, "Source: %s", s);
|
|
offset += advance;
|
|
|
|
proto_tree_add_text(pimopt_tree, tvb, offset, 1, "%s",
|
|
decode_boolean_bitfield(tvb_get_guint8(tvb, offset), 0x80, 8,
|
|
"RP Tree", "Not RP Tree"));
|
|
proto_tree_add_text(pimopt_tree, tvb, offset, 4, "Preference: %u",
|
|
tvb_get_ntohl(tvb, offset) & 0x7fffffff);
|
|
offset += 4;
|
|
|
|
proto_tree_add_text(pimopt_tree, tvb, offset, 4, "Metric: %u",
|
|
tvb_get_ntohl(tvb, offset));
|
|
|
|
break;
|
|
}
|
|
|
|
case 8: /* Candidate-RP-Advertisement */
|
|
{
|
|
const char *s;
|
|
int advance;
|
|
int pfxcnt;
|
|
guint16 holdtime;
|
|
int i;
|
|
|
|
pfxcnt = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_text(pimopt_tree, tvb, offset, 1,
|
|
"Prefix-count: %u", pfxcnt);
|
|
offset += 1;
|
|
proto_tree_add_text(pimopt_tree, tvb, offset, 1,
|
|
"Priority: %u", tvb_get_guint8(tvb, offset));
|
|
offset += 1;
|
|
holdtime = tvb_get_ntohs(tvb, offset);
|
|
proto_tree_add_text(pimopt_tree, tvb, offset, 2,
|
|
"Holdtime: %u%s", holdtime,
|
|
holdtime == 0xffff ? " (infty)" : "");
|
|
offset += 2;
|
|
|
|
s = dissect_pim_addr(tvb, offset, pimv2_unicast, &advance);
|
|
if (s == NULL)
|
|
break;
|
|
proto_tree_add_text(pimopt_tree, tvb, offset, advance, "RP: %s", s);
|
|
offset += advance;
|
|
|
|
for (i = 0; i < pfxcnt; i++) {
|
|
s = dissect_pim_addr(tvb, offset, pimv2_group, &advance);
|
|
if (s == NULL)
|
|
goto breakbreak8;
|
|
proto_tree_add_text(pimopt_tree, tvb, offset, advance,
|
|
"Group %d: %s", i, s);
|
|
offset += advance;
|
|
}
|
|
breakbreak8:
|
|
break;
|
|
}
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
done:;
|
|
}
|
|
|
|
void
|
|
proto_register_pim(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_pim_version,
|
|
{ "Version", "pim.version",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0, "" }},
|
|
{ &hf_pim_type,
|
|
{ "Type", "pim.type",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0, "" }},
|
|
{ &hf_pim_cksum,
|
|
{ "Checksum", "pim.cksum",
|
|
FT_UINT16, BASE_HEX, NULL, 0x0, "" }},
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_pim,
|
|
};
|
|
|
|
proto_pim = proto_register_protocol("Protocol Independent Multicast",
|
|
"PIM", "pim");
|
|
proto_register_field_array(proto_pim, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_pim(void)
|
|
{
|
|
dissector_add("ip.proto", IP_PROTO_PIM, dissect_pim, proto_pim);
|
|
|
|
/*
|
|
* Get a handle for the IP dissector.
|
|
*/
|
|
ip_handle = find_dissector("ip");
|
|
}
|