2 * Routines for the Cisco Auto-RP protocol
3 * ftp://ftpeng.cisco.com/ftp/ipmulticast/specs/pim-autorp-spec01.txt
5 * Heikki Vatiainen <hessu@cs.tut.fi>
7 * $Id: packet-auto_rp.c,v 1.2 2000/01/07 22:05:29 guy Exp $
9 * Ethereal - Network traffic analyzer
10 * By Gerald Combs <gerald@zing.org>
11 * Copyright 1998 Gerald Combs
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version 2
17 * of the License, or (at your option) any later version.
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
33 #ifdef HAVE_SYS_TYPES_H
34 # include <sys/types.h>
37 #ifdef HAVE_NETINET_IN_H
38 #include <netinet/in.h>
46 static gint proto_auto_rp = -1;
47 static gint ett_auto_rp = -1;
48 static gint ett_auto_rp_ver_type = -1;
49 static gint ett_auto_rp_map = -1;
50 static gint ett_auto_rp_group = -1;
52 static gint hf_auto_rp_ver_type = -1;
53 static gint hf_auto_rp_version = -1;
54 static gint hf_auto_rp_type = -1;
55 static gint hf_auto_rp_map = -1;
56 static gint hf_auto_rp_pim_ver = -1;
57 static gint hf_auto_rp_group = -1;
58 static gint hf_auto_rp_mask_sgn = -1;
60 struct auto_rp_fixed_hdr {
61 #define AUTO_RP_VERSION_MASK 0xf0
62 #define AUTO_RP_TYPE_MASK 0x0f
63 guint8 ver_type; /* pim-autorp-spec01.txt defines version 1+ */
64 guint8 rp_count; /* Number of struct auto_rp_maps that follow the this header */
65 guint16 holdtime; /* Time in seconds this announcement is valid. 0 equals forever */
69 struct auto_rp_map_hdr {
70 guint32 rp_address; /* The unicast IPv4 address of this RP */
71 #define AUTO_RP_PIM_VER_MASK 0x03
72 guint8 pim_version; /* RP's highest PIM version. 2-bit field */
73 guint8 group_count; /* Number of encoded group addresses that follow this header */
76 struct auto_rp_enc_grp_hdr { /* Encoded group address */
77 #define AUTO_RP_SIGN_MASK 0x01
78 guint8 prefix_sgn; /* 0 positive, 1 negative group prefix */
79 guint8 mask_len; /* Length of group prefix */
80 guint32 addr; /* Group prefix */
83 #define AUTO_RP_VER_1PLUS 1
84 static const value_string auto_rp_ver_vals[] = {
85 {AUTO_RP_VER_1PLUS, "1 or 1+"},
89 #define AUTO_RP_TYPE_ANNOUNCEMENT 1
90 #define AUTO_RP_TYPE_MAPPING 2
91 static const value_string auto_rp_type_vals[] = {
92 {AUTO_RP_TYPE_ANNOUNCEMENT, "RP announcement"},
93 {AUTO_RP_TYPE_MAPPING, "RP mapping"},
97 #define AUTO_RP_PIM_VERSION_UNKNOWN 0x00
98 #define AUTO_RP_PIM_VERSION_1 0x01
99 #define AUTO_RP_PIM_VERSION_2 0x02
100 #define AUTO_RP_PIM_VERSION_DUAL 0x03
101 static const value_string auto_rp_pim_ver_vals[] = {
102 {AUTO_RP_PIM_VERSION_UNKNOWN, "Version unknown"},
103 {AUTO_RP_PIM_VERSION_1, "Version 1"},
104 {AUTO_RP_PIM_VERSION_2, "Version 2"},
105 {AUTO_RP_PIM_VERSION_DUAL, "Dual version 1 and 2"},
109 #define AUTO_RP_GROUP_MASK_SIGN_POS 0
110 #define AUTO_RP_GROUP_MASK_SIGN_NEG 1
111 static const value_string auto_rp_mask_sign_vals[] = {
112 {AUTO_RP_GROUP_MASK_SIGN_POS, "Positive group prefix"},
113 {AUTO_RP_GROUP_MASK_SIGN_NEG, "Negative group prefix"},
117 static int do_auto_rp_map(const u_char *pd, int offset, frame_data *fd, proto_tree *auto_rp_tree);
119 void dissect_auto_rp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
121 struct auto_rp_fixed_hdr arh;
122 gboolean short_hdr = FALSE;
124 if (sizeof(struct auto_rp_fixed_hdr) > END_OF_FRAME)
127 memcpy(&arh, pd + offset, sizeof(struct auto_rp_fixed_hdr));
129 if (check_col(fd, COL_PROTOCOL))
130 col_add_str(fd, COL_PROTOCOL, "Auto-RP");
132 if (check_col(fd, COL_INFO)) {
134 col_add_fstr(fd, COL_INFO, "Short packet header, length %u", END_OF_FRAME);
136 col_add_fstr(fd, COL_INFO, "%s (v%s) for %u RP%s",
137 val_to_str(lo_nibble(arh.ver_type), auto_rp_type_vals, "Unknown"),
138 val_to_str(hi_nibble(arh.ver_type), auto_rp_ver_vals, "Unknown"),
139 arh.rp_count, plurality(arh.rp_count, "", "s"));
144 proto_tree *auto_rp_tree, *ver_type_tree;
148 dissect_data(pd, offset, fd, tree);
152 ti = proto_tree_add_item(tree, proto_auto_rp, offset, END_OF_FRAME, NULL);
153 auto_rp_tree = proto_item_add_subtree(ti, ett_auto_rp);
155 tv = proto_tree_add_item_format(auto_rp_tree, hf_auto_rp_ver_type, offset, 1,
156 arh.ver_type, "Version: %s, Packet type: %s",
157 val_to_str(hi_nibble(arh.ver_type), auto_rp_ver_vals, "Unknown"),
158 val_to_str(lo_nibble(arh.ver_type), auto_rp_type_vals, "Unknown"));
159 ver_type_tree = proto_item_add_subtree(tv, ett_auto_rp_ver_type);
160 proto_tree_add_item(ver_type_tree, hf_auto_rp_version, offset, 1, arh.ver_type);
161 proto_tree_add_item(ver_type_tree, hf_auto_rp_type, offset, 1, arh.ver_type);
164 proto_tree_add_text(auto_rp_tree, offset++, 1, "RP Count: %u", arh.rp_count);
165 proto_tree_add_text(auto_rp_tree, offset, 2, "Holdtime: %u second%s",
167 plurality(ntohs(arh.holdtime), "", "s"));
169 proto_tree_add_text(auto_rp_tree, offset, 4, "Reserved: 0x%x", arh.reserved);
172 for (i = 0; i < arh.rp_count; i++) {
174 if (sizeof(struct auto_rp_map_hdr) > END_OF_FRAME)
176 ret = do_auto_rp_map(pd, offset, fd, auto_rp_tree);
182 if (END_OF_FRAME > 0)
183 dissect_data(pd, offset, fd, tree);
189 void proto_register_auto_rp(void)
191 static hf_register_info hf[] = {
192 { &hf_auto_rp_ver_type,
193 {"Auto-RP message version and type", "auto_rp.typever",
194 FT_UINT8, BASE_DEC, NULL, 0x0,
195 "Auto-RP version and type"}},
197 { &hf_auto_rp_version,
198 {"Auto-RP protocol version", "auto_rp.version",
199 FT_UINT8, BASE_DEC, VALS(auto_rp_ver_vals), AUTO_RP_VERSION_MASK,
203 {"Auto-RP packet type", "auto_rp.type",
204 FT_UINT8, BASE_DEC, VALS(auto_rp_type_vals), AUTO_RP_TYPE_MASK,
208 {"Auto-RP address map", "auto_rp.map",
209 FT_UINT8, BASE_DEC, NULL, 0x0,
212 { &hf_auto_rp_pim_ver,
213 {"RP's highest PIM version", "auto_rp.pim_ver",
214 FT_UINT8, BASE_DEC, VALS(auto_rp_pim_ver_vals), AUTO_RP_PIM_VER_MASK,
215 "Auto-RP PIM version"}},
218 {"Group mapping to this RP", "auto_rp.grp",
219 FT_UINT8, BASE_DEC, NULL, 0x0,
222 { &hf_auto_rp_mask_sgn,
223 {"Group prefix sign", "auto_rp.mask_sgn",
224 FT_UINT8, BASE_DEC, VALS(auto_rp_mask_sign_vals), AUTO_RP_SIGN_MASK,
228 static gint *ett[] = {
230 &ett_auto_rp_ver_type,
235 proto_auto_rp = proto_register_protocol("Cisco Auto-RP", "auto_rp");
236 proto_register_field_array(proto_auto_rp, hf, array_length(hf));
237 proto_register_subtree_array(ett, array_length(ett));
243 * Handles one Auto-RP map entry. Returns the number of bytes in the map entry or < 0 for error.
245 static int do_auto_rp_map(const u_char *pd, int offset, frame_data *fd, proto_tree *auto_rp_tree)
247 struct auto_rp_map_hdr m;
249 proto_tree *map_tree;
250 struct auto_rp_enc_grp_hdr g;
253 if (sizeof(struct auto_rp_map_hdr) > END_OF_FRAME)
255 memcpy(&m, pd+offset, sizeof(struct auto_rp_map_hdr));
257 ti = proto_tree_add_item_format(auto_rp_tree, hf_auto_rp_map, offset,
258 MIN(sizeof(m) + m.group_count*sizeof(g), END_OF_FRAME), 1,
259 "RP %s: %u group%s", ip_to_str((void *)&m.rp_address),
260 m.group_count, plurality(m.group_count, "", "s"));
261 map_tree = proto_item_add_subtree(ti, ett_auto_rp_map);
262 proto_tree_add_text(map_tree, offset, 4, "Unicast IP address of this RP: %s (%s)",
263 ip_to_str((void *)&m.rp_address), get_hostname(m.rp_address));
265 proto_tree_add_item(map_tree, hf_auto_rp_pim_ver, offset, 1, pd[offset]);
267 proto_tree_add_text(map_tree, offset, 1, "Number of groups this RP maps to: %u", m.group_count);
270 for (i = 0; i < m.group_count; i++) {
272 proto_tree *grp_tree;
273 if (2*sizeof(guint8) + sizeof(guint32) > END_OF_FRAME) /* struct auto_rp_enc_grp_hdr */
276 gi = proto_tree_add_item_format(map_tree, hf_auto_rp_group, offset, 6, 1,
277 "group %s/%u (%s)", ip_to_str(pd + offset + 2),
279 val_to_str(pd[offset]&AUTO_RP_SIGN_MASK, auto_rp_mask_sign_vals, ""));
280 grp_tree = proto_item_add_subtree(gi, ett_auto_rp_group);
282 proto_tree_add_item(grp_tree, hf_auto_rp_mask_sgn, offset, 1, pd[offset]);
284 proto_tree_add_text(grp_tree, offset, 1, "Group mask length: %u", pd[offset]);
286 proto_tree_add_text(grp_tree, offset, 4, "Group prefix: %s", ip_to_str(pd + offset));