![Guy Harris](/assets/img/avatar_default.png)
dynamically-assigned "ett_" integer values, assigned by "proto_register_subtree_array()"; this: obviates the need to update "packet.h" whenever you add a new subtree type - you only have to add a call to "proto_register_subtree_array()" to a "register" routine and an array of pointers to "ett_", if they're not already there, and add a pointer to the new "ett_" variable to the array, if they are there; would allow run-time-loaded dissectors to allocate subtree types when they're loaded. svn path=/trunk/; revision=1043
603 lines
15 KiB
C
603 lines
15 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 1.7 1999/11/16 11:42:46 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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#include "config.h"
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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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#ifdef NEED_SNPRINTF_H
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# ifdef HAVE_STDARG_H
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# include <stdarg.h>
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# else
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# include <varargs.h>
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# endif
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# include "snprintf.h"
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#endif
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#include <glib.h>
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#include "packet.h"
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#include "packet-ipv6.h"
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#ifndef offsetof
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#define offsetof(type, member) ((size_t)(&((type *)0)->member))
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#endif
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struct pim {
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guint8 pim_typever;
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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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guint8 pim_rsv; /* Reserved */
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guint16 pim_cksum; /* IP style check sum */
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};
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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 const char *
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dissect_pim_addr(const u_char *bp, const u_char *ep, enum pimv2_addrtype at,
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int *advance) {
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static char buf[512];
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int af;
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int len = 0;
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if (bp >= ep)
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return NULL;
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switch (bp[0]) {
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case 1:
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af = 4;
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break;
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case 2:
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af = 6;
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break;
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default:
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return NULL;
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}
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if (bp[1] != 0)
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return NULL;
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switch (at) {
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case pimv2_unicast:
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if (af == 4) {
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len = 4;
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if (bp + 2 + len > ep)
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return NULL;
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(void)snprintf(buf, sizeof(buf), "%s", ip_to_str(bp + 2));
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}
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else if (af == 6) {
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len = 16;
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if (bp + 2 + len > ep)
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return NULL;
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(void)snprintf(buf, sizeof(buf), "%s",
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ip6_to_str((struct e_in6_addr *)(bp + 2)));
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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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if (af == 4) {
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len = 4;
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if (bp + 4 + len > ep)
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return NULL;
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(void)snprintf(buf, sizeof(buf), "%s/%u", ip_to_str(bp + 4), bp[3]);
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}
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else if (af == 6) {
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len = 16;
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if (bp + 4 + len > ep)
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return NULL;
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(void)snprintf(buf, sizeof(buf), "%s/%u",
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ip6_to_str((struct e_in6_addr *)(bp + 4)), bp[3]);
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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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if (af == 4) {
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len = 4;
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if (bp + 4 + len > ep)
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return NULL;
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(void)snprintf(buf, sizeof(buf), "%s/%u", ip_to_str(bp + 4), bp[3]);
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}
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else if (af == 6) {
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len = 16;
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if (bp + 4 + len > ep)
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return NULL;
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(void)snprintf(buf, sizeof(buf), "%s/%u",
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ip6_to_str((struct e_in6_addr *)(bp + 4)), bp[3]);
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}
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if (bp[2]) {
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(void)snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
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" (%s%s%s)",
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bp[2] & 0x04 ? "S" : "",
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bp[2] & 0x02 ? "W" : "",
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bp[2] & 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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void
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dissect_pim(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
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struct pim pim;
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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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/* avoid alignment problem */
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memcpy(&pim, &pd[offset], sizeof(pim));
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switch (PIM_VER(pim.pim_typever)) {
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case 1:
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typestr = val_to_str(PIM_TYPE(pim.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.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(fd, COL_PROTOCOL)) {
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col_add_fstr(fd, COL_PROTOCOL, "PIM version %d",
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PIM_VER(pim.pim_typever));
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}
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if (check_col(fd, COL_INFO))
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col_add_fstr(fd, COL_INFO, "%s", typestr);
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if (tree) {
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ti = proto_tree_add_item(tree, proto_pim, offset, END_OF_FRAME, NULL);
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pim_tree = proto_item_add_subtree(ti, ett_pim);
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proto_tree_add_item(pim_tree, hf_pim_version, offset, 1,
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PIM_VER(pim.pim_typever));
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proto_tree_add_item_format(pim_tree, hf_pim_type, offset, 1,
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PIM_TYPE(pim.pim_typever),
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"Type: %s (%u)", typestr, PIM_TYPE(pim.pim_typever));
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proto_tree_add_item(pim_tree, hf_pim_cksum,
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offset + offsetof(struct pim, pim_cksum), sizeof(pim.pim_cksum),
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ntohs(pim.pim_cksum));
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if (sizeof(struct pim) < END_OF_FRAME) {
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tiopt = proto_tree_add_text(pim_tree,
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offset + sizeof(struct pim), END_OF_FRAME,
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"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.pim_typever) != 2)
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goto done;
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/* version 2 decoder */
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switch (PIM_TYPE(pim.pim_typever)) {
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case 0: /*hello*/
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{
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guint16 *w;
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w = (guint16 *)&pd[offset + sizeof(struct pim)];
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while ((guint8 *)w < &pd[offset + END_OF_FRAME]) {
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if (ntohs(w[0]) == 1 && ntohs(w[1]) == 2
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&& (guint8 *)&w[3] <= &pd[offset + END_OF_FRAME]) {
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proto_tree_add_text(pimopt_tree, (guint8 *)w - pd, 6,
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"Holdtime: %u%s", ntohs(w[2]),
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ntohs(w[2]) == 0xffff ? " (infty)" : "");
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w += 3;
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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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const guint8 *ip;
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proto_tree *flag_tree = NULL;
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proto_item *tiflag;
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int flagoff;
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flagoff = offset + sizeof(struct pim);
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tiflag = proto_tree_add_text(pimopt_tree, flagoff, 4,
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"Flags: 0x%08x", ntohl(*(guint32 *)&pd[flagoff]));
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flag_tree = proto_item_add_subtree(tiflag, ett_pim);
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proto_tree_add_text(flag_tree, flagoff, 1, "%s",
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decode_boolean_bitfield(pd[flagoff], 0x80000000, 32,
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"Border", "Not border"));
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proto_tree_add_text(flag_tree, flagoff, 1, "%s",
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decode_boolean_bitfield(pd[flagoff], 0x40000000, 32,
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"Null-Register", "Not Null-Register"));
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ip = &pd[flagoff + sizeof(guint32)];
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switch((*ip & 0xf0) >> 4) {
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case 4: /* IPv4 */
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#if 0
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dissect_ip(pd, ip - pd, fd, tree);
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#else
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dissect_ip(pd, ip - pd, fd, pimopt_tree);
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#endif
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break;
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case 6: /* IPv6 */
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#if 0
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dissect_ipv6(pd, ip - pd, fd, tree);
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#else
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dissect_ipv6(pd, ip - pd, 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,
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ip - pd, END_OF_FRAME,
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"Unknown IP version %d", (*ip & 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 guint8 *ep;
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const char *s;
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ep = &pd[offset + END_OF_FRAME];
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offset += sizeof(struct pim);
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s = dissect_pim_addr(&pd[offset], ep, 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, offset, advance, "Group: %s", s);
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offset += advance;
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s = dissect_pim_addr(&pd[offset], ep, 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, 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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const guint8 *ep;
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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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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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ep = &pd[offset + END_OF_FRAME];
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offset += sizeof(struct pim);
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if (PIM_TYPE(pim.pim_typever) != 7) {
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/* not graft-ack */
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s = dissect_pim_addr(&pd[offset], ep, 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, offset, advance,
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"Upstream-neighbor: %s", s);
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offset += advance;
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}
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if (&pd[offset + 2] > ep)
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break;
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ngroup = pd[offset + 1];
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proto_tree_add_text(pimopt_tree, offset + 1, 1,
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"Groups: %u", pd[offset + 1]);
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offset += 2;
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if (&pd[offset + 2] > ep)
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break;
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if (PIM_TYPE(pim.pim_typever) != 7) {
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/* not graft-ack */
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proto_tree_add_text(pimopt_tree, offset, 2,
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"Holdtime: %u%s", ntohs(*(guint16 *)&pd[offset]),
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ntohs(*(guint16 *)&pd[offset]) == 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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if (&pd[offset] >= ep)
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goto breakbreak3;
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s = dissect_pim_addr(&pd[offset], ep, 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, 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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if (&pd[offset + 4] > ep)
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goto breakbreak3;
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njoin = ntohs(*(guint16 *)&pd[offset]);
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nprune = ntohs(*(guint16 *)&pd[offset + 2]);
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tisub = proto_tree_add_text(grouptree, 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++) {
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s = dissect_pim_addr(&pd[off], ep, pimv2_source,
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&advance);
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if (s == NULL)
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goto breakbreak3;
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proto_tree_add_text(subtree, off, advance,
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"IP address: %s", s);
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off += advance;
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}
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tisub = proto_tree_add_text(grouptree, offset + 2, 2,
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"Prune: %d", nprune);
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subtree = proto_item_add_subtree(tisub, ett_pim);
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for (j = 0; j < nprune; j++) {
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s = dissect_pim_addr(&pd[off], ep, pimv2_source,
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&advance);
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if (s == NULL)
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goto breakbreak3;
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proto_tree_add_text(subtree, off, advance,
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"IP address: %s", s);
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off += advance;
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}
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}
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breakbreak3:
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break;
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}
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case 4: /* bootstrap */
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{
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const char *s;
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int advance;
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int i, j;
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int frpcnt;
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proto_tree *grouptree = NULL;
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proto_item *tigroup;
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offset += sizeof(struct pim);
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if (END_OF_FRAME < 2)
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break;
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proto_tree_add_text(pimopt_tree, offset, 2,
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"Fragment tag: 0x%04x", ntohs(*(guint16 *)&pd[offset]));
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offset += 2;
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if (END_OF_FRAME < 2)
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break;
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proto_tree_add_text(pimopt_tree, offset, 1,
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"Hash mask len: %u", pd[offset]);
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proto_tree_add_text(pimopt_tree, offset + 1, 1,
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"BSR priority: %u", pd[offset + 1]);
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offset += 2;
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s = dissect_pim_addr(&pd[offset], &pd[offset + END_OF_FRAME],
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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, offset, advance, "BSR: %s", s);
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offset += advance;
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for (i = 0; END_OF_FRAME > 0; i++) {
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s = dissect_pim_addr(&pd[offset], &pd[offset + END_OF_FRAME],
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pimv2_group, &advance);
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if (s == NULL)
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goto breakbreak4;
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tigroup = proto_tree_add_text(pimopt_tree, 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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if (END_OF_FRAME < 2)
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goto breakbreak4;
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proto_tree_add_text(grouptree, offset, 1,
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"RP count: %u", pd[offset]);
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proto_tree_add_text(grouptree, offset + 1, 1,
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"FRP count: %u", pd[offset + 1]);
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frpcnt = pd[offset + 1];
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offset += 4;
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for (j = 0; j < frpcnt && END_OF_FRAME > 0; j++) {
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s = dissect_pim_addr(&pd[offset],
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&pd[offset + END_OF_FRAME], pimv2_unicast, &advance);
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if (s == NULL)
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goto breakbreak4;
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proto_tree_add_text(grouptree, offset, advance,
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"RP %d: %s", j, s);
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offset += advance;
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if (END_OF_FRAME < 4)
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goto breakbreak4;
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proto_tree_add_text(grouptree, offset, 2,
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"Holdtime: %u%s", ntohs(*(guint16 *)&pd[offset]),
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ntohs(*(guint16 *)&pd[offset]) == 0xffff ? " (infty)" : "");
|
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proto_tree_add_text(grouptree, offset + 3, 1,
|
|
"Priority: %u", pd[offset + 3]);
|
|
|
|
offset += 4;
|
|
}
|
|
}
|
|
|
|
breakbreak4:
|
|
break;
|
|
}
|
|
|
|
case 5: /* assert */
|
|
{
|
|
const char *s;
|
|
int advance;
|
|
|
|
offset += sizeof(struct pim);
|
|
|
|
s = dissect_pim_addr(&pd[offset], &pd[offset + END_OF_FRAME],
|
|
pimv2_group, &advance);
|
|
if (s == NULL)
|
|
break;
|
|
proto_tree_add_text(pimopt_tree, offset, advance, "Group: %s", s);
|
|
offset += advance;
|
|
|
|
s = dissect_pim_addr(&pd[offset], &pd[offset + END_OF_FRAME],
|
|
pimv2_unicast, &advance);
|
|
if (s == NULL)
|
|
break;
|
|
proto_tree_add_text(pimopt_tree, offset, advance, "Source: %s", s);
|
|
offset += advance;
|
|
|
|
if (END_OF_FRAME < 4)
|
|
break;
|
|
proto_tree_add_text(pimopt_tree, offset, 1, "%s",
|
|
decode_boolean_bitfield(pd[offset], 0x80, 8,
|
|
"RP Tree", "Not RP Tree"));
|
|
proto_tree_add_text(pimopt_tree, offset, 4, "Preference: %u",
|
|
ntohl(*(guint32 *)&pd[offset] & 0x7fffffff));
|
|
offset += 4;
|
|
|
|
if (END_OF_FRAME < 4)
|
|
break;
|
|
proto_tree_add_text(pimopt_tree, offset, 4, "Metric: %u",
|
|
ntohl(*(guint32 *)&pd[offset]));
|
|
|
|
break;
|
|
}
|
|
|
|
case 8: /* Candidate-RP-Advertisement */
|
|
{
|
|
const char *s;
|
|
int advance;
|
|
int pfxcnt;
|
|
int i;
|
|
|
|
offset += sizeof(struct pim);
|
|
if (END_OF_FRAME < 4)
|
|
break;
|
|
pfxcnt = pd[offset];
|
|
proto_tree_add_text(pimopt_tree, offset, 1,
|
|
"Prefix-count: %u", pd[offset]);
|
|
proto_tree_add_text(pimopt_tree, offset + 1, 1,
|
|
"Priority: %u", pd[offset + 1]);
|
|
proto_tree_add_text(pimopt_tree, offset + 2, 2,
|
|
"Holdtime: %u%s", ntohs(*(guint16 *)&pd[offset + 2]),
|
|
ntohs(*(guint16 *)&pd[offset + 2]) == 0xffff ? " (infty)" : "");
|
|
offset += 4;
|
|
|
|
if (END_OF_FRAME <= 0)
|
|
break;
|
|
s = dissect_pim_addr(&pd[offset], &pd[offset + END_OF_FRAME],
|
|
pimv2_unicast, &advance);
|
|
if (s == NULL)
|
|
break;
|
|
proto_tree_add_text(pimopt_tree, offset, advance, "RP: %s", s);
|
|
offset += advance;
|
|
|
|
for (i = 0; i < pfxcnt && END_OF_FRAME > 0; i++) {
|
|
s = dissect_pim_addr(&pd[offset], &pd[offset + END_OF_FRAME],
|
|
pimv2_group, &advance);
|
|
if (s == NULL)
|
|
goto breakbreak8;
|
|
proto_tree_add_text(pimopt_tree, 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");
|
|
proto_register_field_array(proto_pim, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|