Added Cisco Auto-RP dissector from Heikki Vatiainen <hessu@cs.tut.fi>

svn path=/trunk/; revision=1099

1 files changed, 293 insertions, 0 deletions

diff --git a/packet-auto_rp.c b/packet-auto_rp.c
new file mode 100644
index 0000000000..f7efb58960
--- /dev/null
+++ b/packet-auto_rp.c
@@ -0,0 +1,293 @@
+/* packet-auto_rp.c
+ * Routines for the Cisco Auto-RP protocol
+ * ftp://ftpeng.cisco.com/ftp/ipmulticast/specs/pim-autorp-spec01.txt
+ *
+ * Heikki Vatiainen <hessu@cs.tut.fi>
+ *
+ * $Id: packet-auto_rp.c,v 1.1 1999/11/23 17:09:57 gram Exp $
+ *
+ * Ethereal - Network traffic analyzer
+ * By Gerald Combs <gerald@unicom.net>
+ * Copyright 1998 Gerald Combs
+ *
+ * 
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#ifdef HAVE_SYS_TYPES_H
+# include <sys/types.h>
+#endif
+
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+
+#include <string.h>
+#include <glib.h>
+#include "packet.h"
+#include "resolv.h"
+
+static gint proto_auto_rp = -1;
+static gint ett_auto_rp = -1;
+static gint ett_auto_rp_ver_type = -1;
+static gint ett_auto_rp_map = -1;
+static gint ett_auto_rp_group = -1;
+
+static gint hf_auto_rp_ver_type = -1;
+static gint hf_auto_rp_version = -1;
+static gint hf_auto_rp_type = -1;
+static gint hf_auto_rp_map = -1;
+static gint hf_auto_rp_pim_ver = -1;
+static gint hf_auto_rp_group = -1;
+static gint hf_auto_rp_mask_sgn = -1;
+
+struct auto_rp_fixed_hdr {
+#define AUTO_RP_VERSION_MASK 0xf0
+#define AUTO_RP_TYPE_MASK    0x0f
+        guint8  ver_type;       /* pim-autorp-spec01.txt defines version 1+ */
+        guint8  rp_count;       /* Number of struct auto_rp_maps that follow the this header */
+        guint16 holdtime;       /* Time in seconds this announcement is valid. 0 equals forever */
+        guint32 reserved;
+};
+
+struct auto_rp_map_hdr {
+        guint32 rp_address;       /* The unicast IPv4 address of this RP */
+#define AUTO_RP_PIM_VER_MASK 0x03
+        guint8  pim_version;      /* RP's highest PIM version. 2-bit field */
+        guint8  group_count;      /* Number of encoded group addresses that follow this header */
+};
+
+struct auto_rp_enc_grp_hdr {   /* Encoded group address */
+#define AUTO_RP_SIGN_MASK 0x01
+        guint8  prefix_sgn;    /* 0 positive, 1 negative group prefix */
+        guint8  mask_len;      /* Length of group prefix */
+        guint32 addr;          /* Group prefix */
+};
+
+#define AUTO_RP_VER_1PLUS 1
+static const value_string auto_rp_ver_vals[] = {
+        {AUTO_RP_VER_1PLUS, "1 or 1+"},
+        {0,                 NULL}
+};
+
+#define AUTO_RP_TYPE_ANNOUNCEMENT 1
+#define AUTO_RP_TYPE_MAPPING      2
+static const value_string auto_rp_type_vals[] = {
+        {AUTO_RP_TYPE_ANNOUNCEMENT, "RP announcement"},
+        {AUTO_RP_TYPE_MAPPING,      "RP mapping"},
+        {0,                         NULL}
+};
+
+#define AUTO_RP_PIM_VERSION_UNKNOWN 0x00
+#define AUTO_RP_PIM_VERSION_1       0x01
+#define AUTO_RP_PIM_VERSION_2       0x02
+#define AUTO_RP_PIM_VERSION_DUAL    0x03
+static const value_string auto_rp_pim_ver_vals[] = {
+        {AUTO_RP_PIM_VERSION_UNKNOWN, "Version unknown"},
+        {AUTO_RP_PIM_VERSION_1,       "Version 1"},
+        {AUTO_RP_PIM_VERSION_2,       "Version 2"},
+        {AUTO_RP_PIM_VERSION_DUAL,    "Dual version 1 and 2"},
+        {0,                           NULL}
+};
+
+#define AUTO_RP_GROUP_MASK_SIGN_POS 0
+#define AUTO_RP_GROUP_MASK_SIGN_NEG 1
+static const value_string auto_rp_mask_sign_vals[] = {
+        {AUTO_RP_GROUP_MASK_SIGN_POS,  "Positive group prefix"},
+        {AUTO_RP_GROUP_MASK_SIGN_NEG,  "Negative group prefix"},
+        {0,                            NULL}
+};
+
+static int do_auto_rp_map(const u_char *pd, int offset, frame_data *fd, proto_tree *auto_rp_tree);
+
+void dissect_auto_rp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
+{
+        struct auto_rp_fixed_hdr arh;
+        gboolean short_hdr = FALSE;
+
+        if (sizeof(struct auto_rp_fixed_hdr) > END_OF_FRAME)
+                short_hdr = TRUE;
+        else
+                memcpy(&arh, pd + offset, sizeof(struct auto_rp_fixed_hdr));
+
+        if (check_col(fd, COL_PROTOCOL))
+                col_add_str(fd, COL_PROTOCOL, "Auto-RP");
+        
+        if (check_col(fd, COL_INFO)) {
+                if (short_hdr)
+                        col_add_fstr(fd, COL_INFO, "Short packet header, length %u", END_OF_FRAME);
+                else
+                        col_add_fstr(fd, COL_INFO, "%s (v%s) for %u RP%s",
+                                     val_to_str(lo_nibble(arh.ver_type), auto_rp_type_vals, "Unknown"),
+                                     val_to_str(hi_nibble(arh.ver_type), auto_rp_ver_vals, "Unknown"),
+                                     arh.rp_count, plurality(arh.rp_count, "", "s"));
+        }
+
+        if (tree) {
+                proto_item *ti, *tv;
+                proto_tree *auto_rp_tree, *ver_type_tree;
+                int i;
+
+                if (short_hdr) {
+                        dissect_data(pd, offset, fd, tree);
+                        return;
+                }
+
+                ti = proto_tree_add_item(tree, proto_auto_rp, offset, END_OF_FRAME, NULL);
+                auto_rp_tree = proto_item_add_subtree(ti, ett_auto_rp);
+
+                tv = proto_tree_add_item_format(auto_rp_tree, hf_auto_rp_ver_type, offset, 1,
+                                                arh.ver_type, "Version: %s, Packet type: %s",
+                                                val_to_str(hi_nibble(arh.ver_type), auto_rp_ver_vals, "Unknown"),
+                                                val_to_str(lo_nibble(arh.ver_type), auto_rp_type_vals, "Unknown"));
+                ver_type_tree = proto_item_add_subtree(tv, ett_auto_rp_ver_type);
+                proto_tree_add_item(ver_type_tree, hf_auto_rp_version, offset, 1, arh.ver_type);
+                proto_tree_add_item(ver_type_tree, hf_auto_rp_type, offset, 1, arh.ver_type);
+                offset++;
+
+                proto_tree_add_text(auto_rp_tree, offset++, 1, "RP Count: %u", arh.rp_count);
+                proto_tree_add_text(auto_rp_tree, offset, 2, "Holdtime: %u second%s",
+                                    ntohs(arh.holdtime),
+                                    plurality(ntohs(arh.holdtime), "", "s"));
+                offset+=2;
+                proto_tree_add_text(auto_rp_tree, offset, 4, "Reserved: 0x%x", arh.reserved);
+                offset+=4;
+
+                for (i = 0; i < arh.rp_count; i++) {
+                        int ret;
+                        if (sizeof(struct auto_rp_map_hdr) > END_OF_FRAME)
+                                break;
+                        ret = do_auto_rp_map(pd, offset, fd, auto_rp_tree);
+                        if (ret < 0)
+                                break;
+                        offset += ret;
+                }
+
+                if (END_OF_FRAME > 0)
+                        dissect_data(pd, offset, fd, tree);
+        }
+
+        return;
+}
+
+void proto_register_auto_rp(void)
+{
+        static hf_register_info hf[] = {
+                { &hf_auto_rp_ver_type,
+                  {"Auto-RP message version and type", "auto_rp.typever",
+                   FT_UINT8, BASE_DEC, NULL, 0x0,
+                   "Auto-RP version and type"}},
+
+                { &hf_auto_rp_version,
+                  {"Auto-RP protocol version", "auto_rp.version",
+                   FT_UINT8, BASE_DEC, VALS(auto_rp_ver_vals), AUTO_RP_VERSION_MASK,
+                   "Auto-RP version"}},
+
+                { &hf_auto_rp_type,
+                  {"Auto-RP packet type", "auto_rp.type",
+                   FT_UINT8, BASE_DEC, VALS(auto_rp_type_vals), AUTO_RP_TYPE_MASK,
+                   "Auto-RP type"}},
+
+                { &hf_auto_rp_map,
+                  {"Auto-RP address map", "auto_rp.map",
+                   FT_UINT8, BASE_DEC, NULL, 0x0,
+                   "Auto-RP mapping"}},
+
+                { &hf_auto_rp_pim_ver,
+                  {"RP's highest PIM version", "auto_rp.pim_ver",
+                   FT_UINT8, BASE_DEC, VALS(auto_rp_pim_ver_vals), AUTO_RP_PIM_VER_MASK,
+                   "Auto-RP PIM version"}},
+
+                { &hf_auto_rp_group,
+                  {"Group mapping to this RP", "auto_rp.grp",
+                   FT_UINT8, BASE_DEC, NULL, 0x0,
+                   "RP's group"}},
+
+                { &hf_auto_rp_mask_sgn,
+                  {"Group prefix sign", "auto_rp.mask_sgn",
+                   FT_UINT8, BASE_DEC, VALS(auto_rp_mask_sign_vals), AUTO_RP_SIGN_MASK,
+                   "Prefix sign"}}
+        };
+
+        static gint *ett[] = {
+                &ett_auto_rp,
+                &ett_auto_rp_ver_type,
+                &ett_auto_rp_map,
+                &ett_auto_rp_group
+        };
+
+        proto_auto_rp = proto_register_protocol("Cisco Auto-RP", "auto_rp");
+        proto_register_field_array(proto_auto_rp, hf, array_length(hf));
+        proto_register_subtree_array(ett, array_length(ett));
+
+        return;
+}
+
+/*
+ * Handles one Auto-RP map entry. Returns the number of bytes in the map entry or < 0 for error.
+ */
+static int do_auto_rp_map(const u_char *pd, int offset, frame_data *fd, proto_tree *auto_rp_tree)
+{
+        struct auto_rp_map_hdr m;
+        proto_item *ti;
+        proto_tree *map_tree;
+        struct auto_rp_enc_grp_hdr g;
+        int i;
+
+        if (sizeof(struct auto_rp_map_hdr) > END_OF_FRAME)
+                return -1;
+        memcpy(&m, pd+offset, sizeof(struct auto_rp_map_hdr));
+
+        ti = proto_tree_add_item_format(auto_rp_tree, hf_auto_rp_map, offset,
+                                        MIN(sizeof(m) + m.group_count*sizeof(g), END_OF_FRAME), 1,
+                                        "RP %s: %u group%s", ip_to_str((void *)&m.rp_address),
+                                        m.group_count, plurality(m.group_count, "", "s"));
+        map_tree = proto_item_add_subtree(ti, ett_auto_rp_map);
+        proto_tree_add_text(map_tree, offset, 4, "Unicast IP address of this RP: %s (%s)",
+                            ip_to_str((void *)&m.rp_address), get_hostname(m.rp_address));
+        offset +=4;
+        proto_tree_add_item(map_tree, hf_auto_rp_pim_ver, offset, 1, pd[offset]);
+        offset++;
+        proto_tree_add_text(map_tree, offset, 1, "Number of groups this RP maps to: %u", m.group_count);
+        offset++;
+
+        for (i = 0; i < m.group_count; i++) {
+                proto_item *gi;
+                proto_tree *grp_tree;
+                if (2*sizeof(guint8) + sizeof(guint32) > END_OF_FRAME) /* struct auto_rp_enc_grp_hdr */
+                        return -1;
+
+                gi = proto_tree_add_item_format(map_tree, hf_auto_rp_group, offset, 6, 1,
+                                                "group %s/%u (%s)", ip_to_str(pd + offset + 2),
+                                                pd[offset + 1],
+                                                val_to_str(pd[offset]&AUTO_RP_SIGN_MASK, auto_rp_mask_sign_vals, ""));
+                grp_tree = proto_item_add_subtree(gi, ett_auto_rp_group);
+
+                proto_tree_add_item(grp_tree, hf_auto_rp_mask_sgn, offset, 1, pd[offset]);
+                offset++;
+                proto_tree_add_text(grp_tree, offset, 1, "Group mask length: %u", pd[offset]);
+                offset++;
+                proto_tree_add_text(grp_tree, offset, 4, "Group prefix: %s", ip_to_str(pd + offset));
+                offset +=4;
+         
+        }
+
+        return offset;
+}
+