2 * Routines for PIM disassembly
3 * (c) Copyright Jun-ichiro itojun Hagino <itojun@itojun.org>
7 * Ethereal - Network traffic analyzer
8 * By Gerald Combs <gerald@ethereal.com>
9 * Copyright 1998 Gerald Combs
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version 2
14 * of the License, or (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
30 #include <stddef.h> /* For offsetof */
34 #ifdef NEED_SNPRINTF_H
35 # include "snprintf.h"
38 #include <epan/packet.h>
39 #include <epan/ipproto.h>
41 #include "packet-ipv6.h"
42 #include <epan/in_cksum.h>
44 #define PIM_TYPE(x) ((x) & 0x0f)
45 #define PIM_VER(x) (((x) & 0xf0) >> 4)
48 pimv2_unicast, pimv2_group, pimv2_source
51 static int proto_pim = -1;
52 static int hf_pim_version = -1;
53 static int hf_pim_type = -1;
54 static int hf_pim_code = -1;
55 static int hf_pim_cksum = -1;
57 static gint ett_pim = -1;
59 static dissector_handle_t ip_handle;
60 static dissector_handle_t ipv6_handle;
63 * For PIM v1, see the PDF slides at
65 * http://www.mbone.de/training/Module3.pdf
67 * Is it documented anywhere else?
70 dissect_pimv1_addr(tvbuff_t *tvb, int offset) {
72 guint16 flags_masklen;
74 flags_masklen = tvb_get_ntohs(tvb, offset);
75 if (flags_masklen & 0x0180) {
76 (void)snprintf(buf, sizeof(buf),
78 flags_masklen & 0x0100 ? "S" : "",
79 flags_masklen & 0x0080 ? "W" : "",
80 flags_masklen & 0x0040 ? "R" : "");
83 (void)snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "%s/%u",
84 ip_to_str(tvb_get_ptr(tvb, offset + 2, 4)), flags_masklen & 0x3f);
89 static const value_string type1vals[] = {
92 { 2, "Register-stop" },
94 { 4, "RP-Reachable" },
102 /* This function is only called from the IGMP dissector */
104 dissect_pimv1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
108 guint length, pim_length;
109 guint16 pim_cksum, computed_cksum;
111 proto_tree *pim_tree = NULL;
113 proto_tree *pimopt_tree = NULL;
116 if (!proto_is_protocol_enabled(find_protocol_by_id(proto_pim))) {
118 * We are not enabled; skip entire packet to be nice to the
119 * IGMP layer (so clicking on IGMP will display the data).
121 return offset+tvb_length_remaining(tvb, offset);
124 if (check_col(pinfo->cinfo, COL_PROTOCOL))
125 col_set_str(pinfo->cinfo, COL_PROTOCOL, "PIMv1");
126 if (check_col(pinfo->cinfo, COL_INFO))
127 col_clear(pinfo->cinfo, COL_INFO);
130 ti = proto_tree_add_item(tree, proto_pim, tvb, offset, -1, FALSE);
131 pim_tree = proto_item_add_subtree(ti, ett_pim);
133 /* Put IGMP type, 0x14, into the tree */
134 proto_tree_add_text(pim_tree, tvb, offset, 1,
139 pim_type = tvb_get_guint8(tvb, offset);
140 if (check_col(pinfo->cinfo, COL_INFO))
141 col_add_str(pinfo->cinfo, COL_INFO,
142 val_to_str(pim_type, type1vals, "Unknown (%u)"));
145 proto_tree_add_uint(pim_tree, hf_pim_code, tvb, offset, 1, pim_type);
149 pim_cksum = tvb_get_ntohs(tvb, offset);
150 pim_ver = PIM_VER(tvb_get_guint8(tvb, offset + 2));
153 * Not PIMv1 - what gives?
156 proto_tree_add_uint(pim_tree, hf_pim_cksum, tvb,
157 offset, 2, pim_cksum);
161 proto_tree_add_uint(pim_tree, hf_pim_version, tvb, offset, 1, pim_ver);
162 return offset+tvb_length_remaining(tvb, offset);
166 * Well, it's PIM v1, so we can check whether this is a
167 * Register message, and thus can figure out how much to
168 * checksum and whether to make the columns read-only.
170 length = tvb_length(tvb);
173 * Register message - the PIM header is 8 bytes long.
174 * Also set the columns non-writable. Otherwise the IPv4 or
175 * IPv6 dissector for the encapsulated packet that caused
176 * this register will overwrite the PIM info in the columns.
179 col_set_writable(pinfo->cinfo, FALSE);
182 * Other message - checksum the entire packet.
184 pim_length = tvb_reported_length(tvb);
188 if (!pinfo->fragmented && length >= pim_length) {
190 * The packet isn't part of a fragmented datagram and isn't
191 * truncated, so we can checksum it.
193 cksum_vec[0].ptr = tvb_get_ptr(tvb, 0, pim_length);
194 cksum_vec[0].len = pim_length;
195 computed_cksum = in_cksum(&cksum_vec[0], 1);
196 if (computed_cksum == 0) {
197 proto_tree_add_uint_format(pim_tree, hf_pim_cksum, tvb,
198 offset, 2, pim_cksum,
199 "Checksum: 0x%04x (correct)",
202 proto_tree_add_uint_format(pim_tree, hf_pim_cksum, tvb,
203 offset, 2, pim_cksum,
204 "Checksum: 0x%04x (incorrect, should be 0x%04x)",
205 pim_cksum, in_cksum_shouldbe(pim_cksum, computed_cksum));
208 proto_tree_add_uint(pim_tree, hf_pim_cksum, tvb,
209 offset, 2, pim_cksum);
215 proto_tree_add_uint(pim_tree, hf_pim_version, tvb, offset, 1, pim_ver);
218 offset += 3; /* skip reserved stuff */
221 if (tvb_reported_length_remaining(tvb, offset) > 0) {
222 tiopt = proto_tree_add_text(pim_tree, tvb, offset, -1,
224 pimopt_tree = proto_item_add_subtree(tiopt, ett_pim);
228 /* version 1 decoder */
234 static const value_string pimv1_modevals[] = {
237 { 2, "Sparse-Dense" },
241 mode = tvb_get_guint8(tvb, offset) >> 4;
242 proto_tree_add_text(pimopt_tree, tvb, offset, 1,
244 val_to_str(mode, pimv1_modevals, "Unknown (%u)"));
246 holdtime = tvb_get_ntohs(tvb, offset);
247 proto_tree_add_text(pimopt_tree, tvb, offset, 2,
248 "Holdtime: %u%s", holdtime,
249 holdtime == 0xffff ? " (infty)" : "");
254 case 1: /* register */
260 * The rest of the packet is a multicast data packet.
262 next_tvb = tvb_new_subset(tvb, offset, -1, -1);
265 * It's an IP packet - determine whether it's IPv4 or IPv6.
267 v_hl = tvb_get_guint8(tvb, offset);
268 switch((v_hl & 0xf0) >> 4) {
269 case 0: /* Null-Register dummy header.
270 * Has the same address family as the encapsulating PIM packet,
271 * e.g. an IPv6 data packet is encapsulated in IPv6 PIM packet.
273 if (pinfo->src.type == AT_IPv4) {
274 proto_tree_add_text(pimopt_tree, tvb, offset, -1,
275 "IPv4 dummy header");
276 proto_tree_add_text(pimopt_tree, tvb, offset + 12, 4,
278 ip_to_str(tvb_get_ptr(tvb, offset + 12, 4)));
279 proto_tree_add_text(pimopt_tree, tvb, offset + 16, 4,
281 ip_to_str(tvb_get_ptr(tvb, offset + 16, 4)));
282 } else if (pinfo->src.type == AT_IPv6) {
283 struct ip6_hdr ip6_hdr;
284 tvb_memcpy(tvb, (guint8 *)&ip6_hdr, offset,
286 proto_tree_add_text(pimopt_tree, tvb, offset, -1,
287 "IPv6 dummy header");
288 proto_tree_add_text(pimopt_tree, tvb,
289 offset + offsetof(struct ip6_hdr, ip6_src), 16,
291 ip6_to_str(&ip6_hdr.ip6_src));
292 proto_tree_add_text(pimopt_tree, tvb,
293 offset + offsetof(struct ip6_hdr, ip6_dst), 16,
295 ip6_to_str(&ip6_hdr.ip6_dst));
297 proto_tree_add_text(pimopt_tree, tvb, offset, -1,
298 "Dummy header for an unknown protocol");
302 call_dissector(ip_handle, next_tvb, pinfo, tree);
304 call_dissector(ip_handle, next_tvb, pinfo, pimopt_tree);
309 call_dissector(ipv6_handle, next_tvb, pinfo, tree);
311 call_dissector(ipv6_handle, next_tvb, pinfo, pimopt_tree);
315 proto_tree_add_text(pimopt_tree, tvb, offset, -1,
316 "Unknown IP version %d", (v_hl & 0xf0) >> 4);
322 case 2: /* register-stop */
324 proto_tree_add_text(pimopt_tree, tvb, offset, 4,
326 ip_to_str(tvb_get_ptr(tvb, offset, 4)));
328 proto_tree_add_text(pimopt_tree, tvb, offset, 4,
330 ip_to_str(tvb_get_ptr(tvb, offset, 4)));
335 case 3: /* join/prune */
337 case 7: /* graft-ack */
341 int ngroup, i, njoin, nprune, j;
345 proto_tree *grouptree = NULL;
347 proto_tree *subtree = NULL;
350 proto_tree_add_text(pimopt_tree, tvb, offset, 4,
351 "Upstream-neighbor: %s",
352 ip_to_str(tvb_get_ptr(tvb, offset, 4)));
355 offset += 2; /* skip reserved stuff */
357 holdtime = tvb_get_ntohs(tvb, offset);
358 proto_tree_add_text(pimopt_tree, tvb, offset, 2,
359 "Holdtime: %u%s", holdtime,
360 holdtime == 0xffff ? " (infty)" : "");
363 offset += 1; /* skip reserved stuff */
365 mask_len = tvb_get_guint8(tvb, offset);
366 proto_tree_add_text(pimopt_tree, tvb, offset, 1,
367 "Mask length: %u", mask_len);
370 adr_len = tvb_get_guint8(tvb, offset);
371 proto_tree_add_text(pimopt_tree, tvb, offset, 1,
372 "Address length: %u", adr_len);
375 ngroup = tvb_get_guint8(tvb, offset);
376 proto_tree_add_text(pimopt_tree, tvb, offset, 1,
377 "Groups: %u", ngroup);
380 for (i = 0; i < ngroup; i++) {
382 * XXX - does the group address have the length "adr_len"
383 * and the group mask the length "mask_len"?
385 tigroup = proto_tree_add_text(pimopt_tree, tvb, offset, 4,
387 ip_to_str(tvb_get_ptr(tvb, offset, 4)));
388 grouptree = proto_item_add_subtree(tigroup, ett_pim);
391 proto_tree_add_text(grouptree, tvb, offset, 4,
392 "Group %d Mask: %s", i,
393 ip_to_str(tvb_get_ptr(tvb, offset, 4)));
396 njoin = tvb_get_ntohs(tvb, offset);
397 nprune = tvb_get_ntohs(tvb, offset + 2);
399 tisub = proto_tree_add_text(grouptree, tvb, offset, 2,
401 subtree = proto_item_add_subtree(tisub, ett_pim);
403 for (j = 0; j < njoin; j++) {
404 s = dissect_pimv1_addr(tvb, off);
405 proto_tree_add_text(subtree, tvb, off, 6,
406 "IP address: %s", s);
410 tisub = proto_tree_add_text(grouptree, tvb, offset + 2, 2,
411 "Prune: %d", nprune);
412 subtree = proto_item_add_subtree(tisub, ett_pim);
413 for (j = 0; j < nprune; j++) {
414 s = dissect_pimv1_addr(tvb, off);
415 proto_tree_add_text(subtree, tvb, off, 6,
416 "IP address: %s", s);
424 case 4: /* rp-reachability */
428 proto_tree_add_text(pimopt_tree, tvb, offset, 4,
430 ip_to_str(tvb_get_ptr(tvb, offset, 4)));
433 proto_tree_add_text(pimopt_tree, tvb, offset, 4,
435 ip_to_str(tvb_get_ptr(tvb, offset, 4)));
438 proto_tree_add_text(pimopt_tree, tvb, offset, 4,
440 ip_to_str(tvb_get_ptr(tvb, offset, 4)));
443 offset += 2; /* skip reserved stuff */
445 holdtime = tvb_get_ntohs(tvb, offset);
446 proto_tree_add_text(pimopt_tree, tvb, offset, 2,
447 "Holdtime: %u%s", holdtime,
448 holdtime == 0xffff ? " (infty)" : "");
455 proto_tree_add_text(pimopt_tree, tvb, offset, 4,
457 ip_to_str(tvb_get_ptr(tvb, offset, 4)));
460 proto_tree_add_text(pimopt_tree, tvb, offset, 4,
462 ip_to_str(tvb_get_ptr(tvb, offset, 4)));
465 proto_tree_add_text(pimopt_tree, tvb, offset, 1, "%s",
466 decode_boolean_bitfield(tvb_get_guint8(tvb, offset), 0x80, 8,
467 "RP Tree", "Not RP Tree"));
468 proto_tree_add_text(pimopt_tree, tvb, offset, 4, "Preference: %u",
469 tvb_get_ntohl(tvb, offset) & 0x7fffffff);
472 proto_tree_add_text(pimopt_tree, tvb, offset, 4, "Metric: %u",
473 tvb_get_ntohl(tvb, offset));
484 return offset+tvb_length_remaining(tvb, offset);
488 dissect_pim_addr(tvbuff_t *tvb, int offset, enum pimv2_addrtype at,
490 static char buf[512];
497 af = tvb_get_guint8(tvb, offset);
498 if (af != AFNUM_INET && af != AFNUM_INET6) {
500 * We don't handle the other formats, and addresses don't include
501 * a length field, so we can't even show them as raw bytes.
506 et = tvb_get_guint8(tvb, offset + 1);
509 * The only defined encoding type is 0, for the native encoding;
510 * again, as addresses don't include a length field, we can't
511 * even show addresses with a different encoding type as raw
522 (void)snprintf(buf, sizeof(buf), "%s",
523 ip_to_str(tvb_get_ptr(tvb, offset + 2, len)));
528 (void)snprintf(buf, sizeof(buf), "%s",
529 ip6_to_str((const struct e_in6_addr *)tvb_get_ptr(tvb, offset + 2, len)));
537 mask_len = tvb_get_guint8(tvb, offset + 3);
541 (void)snprintf(buf, sizeof(buf), "%s/%u",
542 ip_to_str(tvb_get_ptr(tvb, offset + 4, len)), mask_len);
547 (void)snprintf(buf, sizeof(buf), "%s/%u",
548 ip6_to_str((const struct e_in6_addr *)tvb_get_ptr(tvb, offset + 4, len)), mask_len);
556 flags = tvb_get_guint8(tvb, offset + 2);
557 mask_len = tvb_get_guint8(tvb, offset + 3);
561 (void)snprintf(buf, sizeof(buf), "%s/%u",
562 ip_to_str(tvb_get_ptr(tvb, offset + 4, len)), mask_len);
567 (void)snprintf(buf, sizeof(buf), "%s/%u",
568 ip6_to_str((const struct e_in6_addr *)tvb_get_ptr(tvb, offset + 4, len)), mask_len);
572 (void)snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
574 flags & 0x04 ? "S" : "",
575 flags & 0x02 ? "W" : "",
576 flags & 0x01 ? "R" : "");
588 static const value_string type2vals[] = {
591 { 2, "Register-stop" },
597 { 8, "Candidate-RP-Advertisement" },
602 * For PIM v2, see RFC 2362, and draft-ietf-pim-sm-v2-new-03 (when PIM
603 * is run over IPv6, the rules for computing the PIM checksum from the
604 * draft in question, not from RFC 2362, should be used).
607 dissect_pim(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) {
610 guint length, pim_length;
611 guint16 pim_cksum, computed_cksum;
615 proto_tree *pim_tree = NULL;
617 proto_tree *pimopt_tree = NULL;
620 if (check_col(pinfo->cinfo, COL_PROTOCOL))
621 col_set_str(pinfo->cinfo, COL_PROTOCOL, "PIM");
622 if (check_col(pinfo->cinfo, COL_INFO))
623 col_clear(pinfo->cinfo, COL_INFO);
625 pim_typever = tvb_get_guint8(tvb, 0);
627 switch (PIM_VER(pim_typever)) {
629 typestr = val_to_str(PIM_TYPE(pim_typever), type2vals, "Unknown (%u)");
631 case 1: /* PIMv1 - we should never see this */
637 if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
638 col_add_fstr(pinfo->cinfo, COL_PROTOCOL, "PIMv%d",
639 PIM_VER(pim_typever));
641 if (check_col(pinfo->cinfo, COL_INFO))
642 col_add_str(pinfo->cinfo, COL_INFO, typestr);
645 ti = proto_tree_add_item(tree, proto_pim, tvb, offset, -1, FALSE);
646 pim_tree = proto_item_add_subtree(ti, ett_pim);
648 proto_tree_add_uint(pim_tree, hf_pim_version, tvb, offset, 1,
649 PIM_VER(pim_typever));
650 proto_tree_add_uint(pim_tree, hf_pim_type, tvb, offset, 1,
651 PIM_TYPE(pim_typever));
653 pim_cksum = tvb_get_ntohs(tvb, offset + 2);
654 length = tvb_length(tvb);
655 if (PIM_VER(pim_typever) == 2) {
657 * Well, it's PIM v2, so we can check whether this is a Register
658 * message, and thus can figure out how much to checksum and
659 * whether to make the columns read-only.
661 if (PIM_TYPE(pim_typever) == 1) {
663 * Register message - the PIM header is 8 bytes long.
664 * Also set the columns non-writable. Otherwise the IPv4 or
665 * IPv6 dissector for the encapsulated packet that caused
666 * this register will overwrite the PIM info in the columns.
669 col_set_writable(pinfo->cinfo, FALSE);
672 * Other message - checksum the entire packet.
674 pim_length = tvb_reported_length(tvb);
678 * We don't know what type of message this is, so say that
679 * the length is 0, to force it not to be checksummed.
683 if (!pinfo->fragmented && length >= pim_length) {
685 * The packet isn't part of a fragmented datagram and isn't
686 * truncated, so we can checksum it.
689 switch (pinfo->src.type) {
691 cksum_vec[0].ptr = tvb_get_ptr(tvb, 0, pim_length);
692 cksum_vec[0].len = pim_length;
693 computed_cksum = in_cksum(&cksum_vec[0], 1);
696 /* Set up the fields of the pseudo-header. */
697 cksum_vec[0].ptr = pinfo->src.data;
698 cksum_vec[0].len = pinfo->src.len;
699 cksum_vec[1].ptr = pinfo->dst.data;
700 cksum_vec[1].len = pinfo->dst.len;
701 cksum_vec[2].ptr = (const guint8 *)&phdr;
702 phdr[0] = g_htonl(pim_length);
703 phdr[1] = g_htonl(IP_PROTO_PIM);
704 cksum_vec[2].len = 8;
705 cksum_vec[3].ptr = tvb_get_ptr(tvb, 0, pim_length);
706 cksum_vec[3].len = pim_length;
707 computed_cksum = in_cksum(&cksum_vec[0], 4);
710 /* PIM is available for IPv4 and IPv6 right now */
711 computed_cksum = 0; /* squelch GCC complaints */
712 DISSECTOR_ASSERT_NOT_REACHED();
716 if (computed_cksum == 0) {
717 proto_tree_add_uint_format(pim_tree, hf_pim_cksum, tvb,
718 offset + 2, 2, pim_cksum,
719 "Checksum: 0x%04x (correct)",
722 proto_tree_add_uint_format(pim_tree, hf_pim_cksum, tvb,
723 offset + 2, 2, pim_cksum,
724 "Checksum: 0x%04x (incorrect, should be 0x%04x)",
725 pim_cksum, in_cksum_shouldbe(pim_cksum, computed_cksum));
728 proto_tree_add_uint(pim_tree, hf_pim_cksum, tvb,
729 offset + 2, 2, pim_cksum);
734 if (tvb_reported_length_remaining(tvb, offset) > 0) {
735 tiopt = proto_tree_add_text(pim_tree, tvb, offset, -1,
737 pimopt_tree = proto_item_add_subtree(tiopt, ett_pim);
741 if (PIM_VER(pim_typever) != 2)
744 /* version 2 decoder */
745 switch (PIM_TYPE(pim_typever)) {
748 while (tvb_reported_length_remaining(tvb, offset) >= 2) {
749 guint16 hello_opt, opt_len;
752 guint16 override_interval;
754 guint32 opt_value = 0;
756 hello_opt = tvb_get_ntohs(tvb, offset);
757 opt_len = tvb_get_ntohs(tvb, offset + 2);
760 opt_value = tvb_get_ntohs(tvb, offset + 4);
762 opt_value = tvb_get_ntohl(tvb, offset + 4);
765 case 1: /* holdtime */
766 holdtime = opt_value;
767 proto_tree_add_text(pimopt_tree, tvb, offset, 4 + opt_len,
768 "Holdtime (%u): %us %s", hello_opt, holdtime,
769 holdtime == 0xffff ? " (infty)" : "");
771 case 2: /* LAN prune delay
774 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
775 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
776 * | Type = 2 | Length = 4 |
777 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
778 * |T| LAN Prune Delay | Override Interval |
779 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
782 proto_tree *sub_tree = NULL;
783 proto_item *landelay_option;
785 landelay_option = proto_tree_add_text(pimopt_tree, tvb, offset, 4 + opt_len,
786 "LAN Prune Delay (%u)", hello_opt);
787 sub_tree = proto_item_add_subtree(landelay_option, ett_pim);
789 lan_delay = (opt_value & 0x7fff0000) >> 16;
790 override_interval = opt_value & 0x0000ffff;
791 proto_tree_add_text(sub_tree, tvb, offset + 4, 1,
793 opt_value & 0x8000 ? "set" : "not set");
794 proto_tree_add_text(sub_tree, tvb, offset + 4, 2,
795 "LAN Delay: %ums", lan_delay);
796 proto_tree_add_text(sub_tree, tvb, offset + 6, 2,
797 "Override Interval: %ums", override_interval);
800 case 19: /* priority */
801 priority = opt_value;
802 proto_tree_add_text(pimopt_tree, tvb, offset, 4 + opt_len,
803 "DR Priority (%u): %u", hello_opt, priority);
805 case 20: /* generation ID */
806 proto_tree_add_text(pimopt_tree, tvb, offset, 4 + opt_len,
807 "Generation ID (%u): %d", hello_opt, opt_value);
810 case 24: /* address list */
811 case 65001: /* address list (old implementations) */
814 proto_tree *sub_tree = NULL;
815 proto_item *addrlist_option;
817 addrlist_option = proto_tree_add_text(pimopt_tree, tvb, offset, 4 + opt_len,
818 "%sAddress List (%u)",
819 hello_opt == 65001 ? "old " : "",
821 sub_tree = proto_item_add_subtree(addrlist_option, ett_pim);
823 for (i = offset + 4; i < offset + 4 + opt_len; ) {
827 s = dissect_pim_addr(tvb, i, pimv2_unicast, &advance);
830 proto_tree_add_text(sub_tree, tvb, offset,
831 advance, "Address: %s", s);
837 proto_tree_add_text(pimopt_tree, tvb, offset, 4 + opt_len,
838 "Unknown option (%u), length: %u, value: 0x%x",
839 hello_opt, opt_len, opt_value);
842 offset += 4 + opt_len;
847 case 1: /* register */
852 proto_tree *flag_tree = NULL;
855 flags = tvb_get_ntohl(tvb, offset);
856 tiflag = proto_tree_add_text(pimopt_tree, tvb, offset, 4,
857 "Flags: 0x%08x", flags);
858 flag_tree = proto_item_add_subtree(tiflag, ett_pim);
859 proto_tree_add_text(flag_tree, tvb, offset, 1, "%s",
860 decode_boolean_bitfield(flags, 0x80000000, 32,
861 "Border", "Not border"));
862 proto_tree_add_text(flag_tree, tvb, offset, 1, "%s",
863 decode_boolean_bitfield(flags, 0x40000000, 32,
864 "Null-Register", "Not Null-Register"));
868 * The rest of the packet is a multicast data packet.
870 next_tvb = tvb_new_subset(tvb, offset, -1, -1);
873 * It's an IP packet - determine whether it's IPv4 or IPv6.
875 v_hl = tvb_get_guint8(tvb, offset);
876 switch((v_hl & 0xf0) >> 4) {
877 case 0: /* Null-Register dummy header.
878 * Has the same address family as the encapsulating PIM packet,
879 * e.g. an IPv6 data packet is encapsulated in IPv6 PIM packet.
881 if (pinfo->src.type == AT_IPv4) {
882 proto_tree_add_text(pimopt_tree, tvb, offset, -1,
883 "IPv4 dummy header");
884 proto_tree_add_text(pimopt_tree, tvb, offset + 12, 4,
886 ip_to_str(tvb_get_ptr(tvb, offset + 12, 4)));
887 proto_tree_add_text(pimopt_tree, tvb, offset + 16, 4,
889 ip_to_str(tvb_get_ptr(tvb, offset + 16, 4)));
890 } else if (pinfo->src.type == AT_IPv6) {
891 struct ip6_hdr ip6_hdr;
892 tvb_memcpy(tvb, (guint8 *)&ip6_hdr, offset,
894 proto_tree_add_text(pimopt_tree, tvb, offset, -1,
895 "IPv6 dummy header");
896 proto_tree_add_text(pimopt_tree, tvb,
897 offset + offsetof(struct ip6_hdr, ip6_src), 16,
899 ip6_to_str(&ip6_hdr.ip6_src));
900 proto_tree_add_text(pimopt_tree, tvb,
901 offset + offsetof(struct ip6_hdr, ip6_dst), 16,
903 ip6_to_str(&ip6_hdr.ip6_dst));
905 proto_tree_add_text(pimopt_tree, tvb, offset, -1,
906 "Dummy header for an unknown protocol");
910 call_dissector(ip_handle, next_tvb, pinfo, tree);
912 call_dissector(ip_handle, next_tvb, pinfo, pimopt_tree);
917 call_dissector(ipv6_handle, next_tvb, pinfo, tree);
919 call_dissector(ipv6_handle, next_tvb, pinfo, pimopt_tree);
923 proto_tree_add_text(pimopt_tree, tvb, offset, -1,
924 "Unknown IP version %d", (v_hl & 0xf0) >> 4);
930 case 2: /* register-stop */
935 s = dissect_pim_addr(tvb, offset, pimv2_group, &advance);
938 proto_tree_add_text(pimopt_tree, tvb, offset, advance, "Group: %s", s);
940 s = dissect_pim_addr(tvb, offset, pimv2_unicast, &advance);
943 proto_tree_add_text(pimopt_tree, tvb, offset, advance, "Source: %s", s);
947 case 3: /* join/prune */
949 case 7: /* graft-ack */
954 int ngroup, i, njoin, nprune, j;
956 proto_tree *grouptree = NULL;
958 proto_tree *subtree = NULL;
961 if (PIM_TYPE(pim_typever) != 7) {
963 s = dissect_pim_addr(tvb, offset, pimv2_unicast, &advance);
966 proto_tree_add_text(pimopt_tree, tvb, offset, advance,
967 "Upstream-neighbor: %s", s);
971 offset += 1; /* skip reserved field */
973 ngroup = tvb_get_guint8(tvb, offset);
974 proto_tree_add_text(pimopt_tree, tvb, offset, 1,
975 "Groups: %u", ngroup);
978 if (PIM_TYPE(pim_typever) != 7) {
980 holdtime = tvb_get_ntohs(tvb, offset);
981 proto_tree_add_text(pimopt_tree, tvb, offset, 2,
982 "Holdtime: %u%s", holdtime,
983 holdtime == 0xffff ? " (infty)" : "");
987 for (i = 0; i < ngroup; i++) {
988 s = dissect_pim_addr(tvb, offset, pimv2_group, &advance);
991 tigroup = proto_tree_add_text(pimopt_tree, tvb, offset, advance,
992 "Group %d: %s", i, s);
993 grouptree = proto_item_add_subtree(tigroup, ett_pim);
996 njoin = tvb_get_ntohs(tvb, offset);
997 nprune = tvb_get_ntohs(tvb, offset + 2);
999 tisub = proto_tree_add_text(grouptree, tvb, offset, 2,
1001 subtree = proto_item_add_subtree(tisub, ett_pim);
1003 for (j = 0; j < njoin; j++) {
1004 s = dissect_pim_addr(tvb, off, pimv2_source,
1008 proto_tree_add_text(subtree, tvb, off, advance,
1009 "IP address: %s", s);
1013 tisub = proto_tree_add_text(grouptree, tvb, offset + 2, 2,
1014 "Prune: %d", nprune);
1015 subtree = proto_item_add_subtree(tisub, ett_pim);
1016 for (j = 0; j < nprune; j++) {
1017 s = dissect_pim_addr(tvb, off, pimv2_source,
1021 proto_tree_add_text(subtree, tvb, off, advance,
1022 "IP address: %s", s);
1031 case 4: /* bootstrap */
1038 proto_tree *grouptree = NULL;
1039 proto_item *tigroup;
1041 proto_tree_add_text(pimopt_tree, tvb, offset, 2,
1042 "Fragment tag: 0x%04x", tvb_get_ntohs(tvb, offset));
1045 proto_tree_add_text(pimopt_tree, tvb, offset, 1,
1046 "Hash mask len: %u", tvb_get_guint8(tvb, offset));
1048 proto_tree_add_text(pimopt_tree, tvb, offset, 1,
1049 "BSR priority: %u", tvb_get_guint8(tvb, offset));
1052 s = dissect_pim_addr(tvb, offset, pimv2_unicast, &advance);
1055 proto_tree_add_text(pimopt_tree, tvb, offset, advance, "BSR: %s", s);
1058 for (i = 0; tvb_reported_length_remaining(tvb, offset) > 0; i++) {
1059 s = dissect_pim_addr(tvb, offset, pimv2_group, &advance);
1062 tigroup = proto_tree_add_text(pimopt_tree, tvb, offset, advance,
1063 "Group %d: %s", i, s);
1064 grouptree = proto_item_add_subtree(tigroup, ett_pim);
1067 proto_tree_add_text(grouptree, tvb, offset, 1,
1068 "RP count: %u", tvb_get_guint8(tvb, offset));
1070 frpcnt = tvb_get_guint8(tvb, offset);
1071 proto_tree_add_text(grouptree, tvb, offset, 1,
1072 "FRP count: %u", frpcnt);
1075 for (j = 0; j < frpcnt; j++) {
1076 s = dissect_pim_addr(tvb, offset, pimv2_unicast, &advance);
1079 proto_tree_add_text(grouptree, tvb, offset, advance,
1083 holdtime = tvb_get_ntohs(tvb, offset);
1084 proto_tree_add_text(grouptree, tvb, offset, 2,
1085 "Holdtime: %u%s", holdtime,
1086 holdtime == 0xffff ? " (infty)" : "");
1088 proto_tree_add_text(grouptree, tvb, offset, 1,
1089 "Priority: %u", tvb_get_guint8(tvb, offset));
1090 offset += 2; /* also skips reserved field */
1098 case 5: /* assert */
1103 s = dissect_pim_addr(tvb, offset, pimv2_group, &advance);
1106 proto_tree_add_text(pimopt_tree, tvb, offset, advance, "Group: %s", s);
1109 s = dissect_pim_addr(tvb, offset, pimv2_unicast, &advance);
1112 proto_tree_add_text(pimopt_tree, tvb, offset, advance, "Source: %s", s);
1115 proto_tree_add_text(pimopt_tree, tvb, offset, 1, "%s",
1116 decode_boolean_bitfield(tvb_get_guint8(tvb, offset), 0x80, 8,
1117 "RP Tree", "Not RP Tree"));
1118 proto_tree_add_text(pimopt_tree, tvb, offset, 4, "Preference: %u",
1119 tvb_get_ntohl(tvb, offset) & 0x7fffffff);
1122 proto_tree_add_text(pimopt_tree, tvb, offset, 4, "Metric: %u",
1123 tvb_get_ntohl(tvb, offset));
1128 case 8: /* Candidate-RP-Advertisement */
1136 pfxcnt = tvb_get_guint8(tvb, offset);
1137 proto_tree_add_text(pimopt_tree, tvb, offset, 1,
1138 "Prefix-count: %u", pfxcnt);
1140 proto_tree_add_text(pimopt_tree, tvb, offset, 1,
1141 "Priority: %u", tvb_get_guint8(tvb, offset));
1143 holdtime = tvb_get_ntohs(tvb, offset);
1144 proto_tree_add_text(pimopt_tree, tvb, offset, 2,
1145 "Holdtime: %u%s", holdtime,
1146 holdtime == 0xffff ? " (infty)" : "");
1149 s = dissect_pim_addr(tvb, offset, pimv2_unicast, &advance);
1152 proto_tree_add_text(pimopt_tree, tvb, offset, advance, "RP: %s", s);
1155 for (i = 0; i < pfxcnt; i++) {
1156 s = dissect_pim_addr(tvb, offset, pimv2_group, &advance);
1159 proto_tree_add_text(pimopt_tree, tvb, offset, advance,
1160 "Group %d: %s", i, s);
1175 proto_register_pim(void)
1177 static hf_register_info hf[] = {
1179 { "Version", "pim.version",
1180 FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }},
1182 { "Type", "pim.type",
1183 FT_UINT8, BASE_DEC, VALS(type2vals), 0x0, "", HFILL }},
1185 { "Code", "pim.code",
1186 FT_UINT8, BASE_DEC, VALS(type1vals), 0x0, "", HFILL }},
1188 { "Checksum", "pim.cksum",
1189 FT_UINT16, BASE_HEX, NULL, 0x0, "", HFILL }},
1191 static gint *ett[] = {
1195 proto_pim = proto_register_protocol("Protocol Independent Multicast",
1197 proto_register_field_array(proto_pim, hf, array_length(hf));
1198 proto_register_subtree_array(ett, array_length(ett));
1202 proto_reg_handoff_pim(void)
1204 dissector_handle_t pim_handle;
1206 pim_handle = create_dissector_handle(dissect_pim, proto_pim);
1207 dissector_add("ip.proto", IP_PROTO_PIM, pim_handle);
1210 * Get handles for the IPv4 and IPv6 dissectors.
1212 ip_handle = find_dissector("ip");
1213 ipv6_handle = find_dissector("ipv6");