diff options
Diffstat (limited to 'epan/dissectors/packet-dhcpv6.c')
-rw-r--r-- | epan/dissectors/packet-dhcpv6.c | 795 |
1 files changed, 795 insertions, 0 deletions
diff --git a/epan/dissectors/packet-dhcpv6.c b/epan/dissectors/packet-dhcpv6.c new file mode 100644 index 0000000000..528969277f --- /dev/null +++ b/epan/dissectors/packet-dhcpv6.c @@ -0,0 +1,795 @@ +/* packet-dhpcv6.c + * Routines for DHCPv6 packet disassembly + * Jun-ichiro itojun Hagino <itojun@iijlab.net> + * IItom Tsutomu MIENO <iitom@utouto.com> + * SHIRASAKI Yasuhiro <yasuhiro@gnome.gr.jp> + * Tony Lindstrom <tony.lindstrom@ericsson.com> + * + * $Id$ + * + * The information used comes from: + * RFC3315.txt + * RFC3319.txt + * RFC3633.txt + * RFC3646.txt + * draft-ietf-dhc-dhcpv6-opt-nisconfig-02.txt + * draft-ietf-dhc-dhcpv6-opt-timeconfig-02.txt + * Note that protocol constants are still subject to change, based on IANA + * assignment decisions. + * + * Ethereal - Network traffic analyzer + * By Gerald Combs <gerald@ethereal.com> + * 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 + +#include <string.h> +#include <glib.h> +#include <epan/int-64bit.h> +#include <epan/packet.h> +#include <epan/ipv6-utils.h> + +static int proto_dhcpv6 = -1; +static int hf_dhcpv6_msgtype = -1; + +static guint ett_dhcpv6 = -1; +static guint ett_dhcpv6_option = -1; + +#define UDP_PORT_DHCPV6_DOWNSTREAM 546 +#define UDP_PORT_DHCPV6_UPSTREAM 547 + +#define DHCPV6_LEASEDURATION_INFINITY 0xffffffff + +#define SOLICIT 1 +#define ADVERTISE 2 +#define REQUEST 3 +#define CONFIRM 4 +#define RENEW 5 +#define REBIND 6 +#define REPLY 7 +#define RELEASE 8 +#define DECLINE 9 +#define RECONFIGURE 10 +#define INFORMATION_REQUEST 11 +#define RELAY_FORW 12 +#define RELAY_REPLY 13 + +#define OPTION_CLIENTID 1 +#define OPTION_SERVERID 2 +#define OPTION_IA_NA 3 +#define OPTION_IA_TA 4 +#define OPTION_IAADDR 5 +#define OPTION_ORO 6 +#define OPTION_PREFERENCE 7 +#define OPTION_ELAPSED_TIME 8 +#define OPTION_RELAY_MSG 9 +/* #define OPTION_SERVER_MSG 10 */ +#define OPTION_AUTH 11 +#define OPTION_UNICAST 12 +#define OPTION_STATUS_CODE 13 +#define OPTION_RAPID_COMMIT 14 +#define OPTION_USER_CLASS 15 +#define OPTION_VENDOR_CLASS 16 +#define OPTION_VENDOR_OPTS 17 +#define OPTION_INTERFACE_ID 18 +#define OPTION_RECONF_MSG 19 +#define OPTION_RECONF_ACCEPT 20 +#define OPTION_SIP_SERVER_D 21 +#define OPTION_SIP_SERVER_A 22 +#define OPTION_DNS_SERVERS 23 +#define OPTION_DOMAIN_LIST 24 +#define OPTION_IA_PD 25 +#define OPTION_IAPREFIX 26 + +/* + * The followings are unassigned numbers. + */ +#define OPTION_NIS_SERVERS 35 +#define OPTION_NISP_SERVERS 36 +#define OPTION_NIS_DOMAIN_NAME 37 +#define OPTION_NISP_DOMAIN_NAME 38 +#define OPTION_NTP_SERVERS 40 +#define OPTION_TIME_ZONE 41 + +#define DUID_LLT 1 +#define DUID_EN 2 +#define DUID_LL 3 +#define DUID_LL_OLD 4 + +static const value_string msgtype_vals[] = { + { SOLICIT, "Solicit" }, + { ADVERTISE, "Advertise" }, + { REQUEST, "Request" }, + { CONFIRM, "Confirm" }, + { RENEW, "Renew" }, + { REBIND, "Rebind" }, + { REPLY, "Reply" }, + { RELEASE, "Release" }, + { DECLINE, "Decline" }, + { RECONFIGURE, "Reconfigure" }, + { INFORMATION_REQUEST, "Information-request" }, + { RELAY_FORW, "Relay-forw" }, + { RELAY_REPLY, "Relay-reply" }, + { 0, NULL } +}; + +static const value_string opttype_vals[] = { + { OPTION_CLIENTID, "Client Identifier" }, + { OPTION_SERVERID, "Server Identifier" }, + { OPTION_IA_NA, "Identify Association" }, + { OPTION_IA_TA, "Identify Association for Temporary Address" }, + { OPTION_IAADDR, "IA Address" }, + { OPTION_ORO, "Option Request" }, + { OPTION_PREFERENCE, "Preference" }, + { OPTION_ELAPSED_TIME, "Elapsed time" }, + { OPTION_RELAY_MSG, "Relay Message" }, +/* { OPTION_SERVER_MSG, "Server message" }, */ + { OPTION_AUTH, "Authentication" }, + { OPTION_UNICAST, "Server unicast" }, + { OPTION_STATUS_CODE, "Status code" }, + { OPTION_RAPID_COMMIT, "Rapid Commit" }, + { OPTION_USER_CLASS, "User Class" }, + { OPTION_VENDOR_CLASS, "Vendor Class" }, + { OPTION_VENDOR_OPTS, "Vendor-specific Information" }, + { OPTION_INTERFACE_ID, "Interface-Id" }, + { OPTION_RECONF_MSG, "Reconfigure Message" }, + { OPTION_RECONF_ACCEPT, "Reconfigure Accept" }, + { OPTION_SIP_SERVER_D, "SIP Server Domain Name List" }, + { OPTION_SIP_SERVER_A, "SIP Servers IPv6 Address List" }, + { OPTION_DNS_SERVERS, "DNS recursive name server" }, + { OPTION_DOMAIN_LIST, "Domain Search List" }, + { OPTION_IA_PD, "Identify Association for Prefix Delegation" }, + { OPTION_IAPREFIX, "IA Prefix" }, + { OPTION_NIS_SERVERS, "Network Information Server" }, + { OPTION_NISP_SERVERS, "Network Information Server V2" }, + { OPTION_NIS_DOMAIN_NAME, "Network Information Server Domain Name" }, + { OPTION_NISP_DOMAIN_NAME,"Network Information Server V2 Domain Name" }, + { OPTION_NTP_SERVERS, "Network Time Protocol Server" }, + { OPTION_TIME_ZONE, "Time zone" }, + { 0, NULL } +}; + +static const value_string statuscode_vals[] = +{ + {0, "Success" }, + {1, "UnspecFail" }, + {2, "NoAddrAvail" }, + {3, "NoBinding" }, + {4, "NotOnLink" }, + {5, "UseMulticast" }, + {6, "NoPrefixAvail" }, + {0, NULL } +}; + +static const value_string duidtype_vals[] = +{ + { DUID_LLT, "link-layer address plus time" }, + { DUID_EN, "assigned by vendor based on Enterprise number" }, + { DUID_LL, "link-layer address" }, + { DUID_LL_OLD, "link-layer address (old)" }, + { 0, NULL } +}; + +/* Returns the number of bytes consumed by this option. */ +static int +dhcpv6_option(tvbuff_t *tvb, proto_tree *bp_tree, int off, int eoff, + gboolean *at_end) +{ + guint16 opttype; + guint16 optlen; + guint16 temp_optlen = 0; + proto_item *ti; + proto_tree *subtree; + int i; + struct e_in6_addr in6; + guint16 duidtype; + + /* option type and length must be present */ + if (eoff - off < 4) { + *at_end = TRUE; + return 0; + } + + opttype = tvb_get_ntohs(tvb, off); + optlen = tvb_get_ntohs(tvb, off + 2); + + /* truncated case */ + if (eoff - off < 4 + optlen) { + *at_end = TRUE; + return 0; + } + + ti = proto_tree_add_text(bp_tree, tvb, off, 4 + optlen, + "%s", val_to_str(opttype, opttype_vals, "DHCP option %u")); + + subtree = proto_item_add_subtree(ti, ett_dhcpv6_option); + proto_tree_add_text(subtree, tvb, off, 2, "option type: %d", opttype); + proto_tree_add_text(subtree, tvb, off + 2, 2, "option length: %d", + optlen); + + off += 4; + switch (opttype) { + case OPTION_CLIENTID: + case OPTION_SERVERID: + if (optlen < 2) { + proto_tree_add_text(subtree, tvb, off, optlen, + "DUID: malformed option"); + break; + } + duidtype = tvb_get_ntohs(tvb, off); + proto_tree_add_text(subtree, tvb, off, 2, + "DUID type: %s (%u)", + val_to_str(duidtype, + duidtype_vals, "Unknown"), + duidtype); + switch (duidtype) { + case DUID_LLT: + if (optlen < 8) { + proto_tree_add_text(subtree, tvb, off, + optlen, "DUID: malformed option"); + break; + } + /* XXX seconds since Jan 1 2000 */ + proto_tree_add_text(subtree, tvb, off + 2, 2, + "Hardware type: %u", + tvb_get_ntohs(tvb, off + 2)); + proto_tree_add_text(subtree, tvb, off + 4, 4, + "Time: %u", tvb_get_ntohl(tvb, off + 4)); + if (optlen > 8) { + proto_tree_add_text(subtree, tvb, off + 8, + optlen - 8, "Link-layer address"); + } + break; + case DUID_EN: + if (optlen < 6) { + proto_tree_add_text(subtree, tvb, off, + optlen, "DUID: malformed option"); + break; + } + proto_tree_add_text(subtree, tvb, off + 2, 4, + "enterprise-number"); + if (optlen > 6) { + proto_tree_add_text(subtree, tvb, off + 6, + optlen - 6, "identifier"); + } + break; + case DUID_LL: + case DUID_LL_OLD: + if (optlen < 4) { + proto_tree_add_text(subtree, tvb, off, + optlen, "DUID: malformed option"); + break; + } + proto_tree_add_text(subtree, tvb, off + 2, 2, + "Hardware type: %u", + tvb_get_ntohs(tvb, off + 2)); + if (optlen > 4) { + proto_tree_add_text(subtree, tvb, off + 4, + optlen - 4, "Link-layer address"); + } + break; + } + break; + case OPTION_IA_NA: + case OPTION_IA_PD: + if (optlen < 12) { + if (opttype == OPTION_IA_NA) + proto_tree_add_text(subtree, tvb, off, + optlen, "IA_NA: malformed option"); + else + proto_tree_add_text(subtree, tvb, off, + optlen, "IA_PD: malformed option"); + break; + } + proto_tree_add_text(subtree, tvb, off, 4, + "IAID: %u", + tvb_get_ntohl(tvb, off)); + proto_tree_add_text(subtree, tvb, off+4, 4, + "T1: %u", tvb_get_ntohl(tvb, off+4)); + proto_tree_add_text(subtree, tvb, off+8, 4, + "T2: %u", tvb_get_ntohl(tvb, off+8)); + + temp_optlen = 12; + while ((optlen - temp_optlen) > 0) { + gboolean at_end_ = FALSE; + temp_optlen += dhcpv6_option(tvb, subtree, off+temp_optlen, off + optlen, &at_end_); + } + break; + case OPTION_IA_TA: + if (optlen < 4) { + proto_tree_add_text(subtree, tvb, off, + optlen, "IA_TA: malformed option"); + break; + } + proto_tree_add_text(subtree, tvb, off, 4, + "IAID: %u", + tvb_get_ntohl(tvb, off)); + temp_optlen = 4; + while ((optlen - temp_optlen) > 0) { + gboolean at_end_; + temp_optlen += dhcpv6_option(tvb, subtree, off+temp_optlen, off + optlen, &at_end_); + } + break; + case OPTION_IAADDR: + { + guint32 preferred_lifetime, valid_lifetime; + + if (optlen < 24) { + proto_tree_add_text(subtree, tvb, off, + optlen, "IAADDR: malformed option"); + break; + } + tvb_memcpy(tvb, (guint8 *)&in6, off, sizeof(in6)); + proto_tree_add_text(subtree, tvb, off, + sizeof(in6), "IPv6 address: %s", + ip6_to_str(&in6)); + + preferred_lifetime = tvb_get_ntohl(tvb, off + 16); + valid_lifetime = tvb_get_ntohl(tvb, off + 20); + + if (preferred_lifetime == DHCPV6_LEASEDURATION_INFINITY) { + proto_tree_add_text(subtree, tvb, off + 16, 4, + "Preferred lifetime: infinity"); + } else { + proto_tree_add_text(subtree, tvb, off + 16, 4, + "Preferred lifetime: %u", preferred_lifetime); + } + if (valid_lifetime == DHCPV6_LEASEDURATION_INFINITY) { + proto_tree_add_text(subtree, tvb, off + 20, 4, + "Valid lifetime: infinity"); + } else { + proto_tree_add_text(subtree, tvb, off + 20, 4, + "Valid lifetime: %u", valid_lifetime); + } + + temp_optlen = 24; + while ((optlen - temp_optlen) > 0) { + gboolean at_end_; + temp_optlen += dhcpv6_option(tvb, subtree, off+temp_optlen, off + optlen, &at_end_); + } + } + break; + case OPTION_ORO: + for (i = 0; i < optlen; i += 2) { + guint16 requested_opt_code; + requested_opt_code = tvb_get_ntohs(tvb, off + i); + proto_tree_add_text(subtree, tvb, off + i, + 2, "Requested Option code: %s (%d)", + val_to_str(requested_opt_code, + opttype_vals, + "Unknown"), + requested_opt_code); + } + break; + case OPTION_PREFERENCE: + if (optlen != 1) { + proto_tree_add_text(subtree, tvb, off, + optlen, "PREFERENCE: malformed option"); + break; + } + proto_tree_add_text(subtree, tvb, off, 1, + "pref-value: %d", + (guint32)tvb_get_guint8(tvb, off)); + break; + case OPTION_ELAPSED_TIME: + if (optlen != 2) { + proto_tree_add_text(subtree, tvb, off, + optlen, "ELAPSED-TIME: malformed option"); + break; + } + proto_tree_add_text(subtree, tvb, off, 2, + "elapsed-time: %d sec", + (guint32)tvb_get_ntohs(tvb, off)); + break; + case OPTION_RELAY_MSG: + if (optlen == 0) { + proto_tree_add_text(subtree, tvb, off, + optlen, "RELAY-MSG: malformed option"); + break; + } else { + gboolean at_end_; + dhcpv6_option(tvb, subtree, off, off + optlen, &at_end_); + } + break; + case OPTION_AUTH: + if (optlen < 15) { + proto_tree_add_text(subtree, tvb, off, + optlen, "AUTH: malformed option"); + break; + } + proto_tree_add_text(subtree, tvb, off, 1, + "Protocol: %d", + (guint32)tvb_get_guint8(tvb, off)); + proto_tree_add_text(subtree, tvb, off+1, 1, + "Algorithm: %d", + (guint32)tvb_get_guint8(tvb, off+1)); + proto_tree_add_text(subtree, tvb, off+2, 1, + "RDM: %d", + (guint32)tvb_get_guint8(tvb, off+2)); + proto_tree_add_text(subtree, tvb, off+3, 8, + "Reply Detection"); + proto_tree_add_text(subtree, tvb, off+11, optlen-11, + "Authentication Information"); + break; + case OPTION_UNICAST: + if (optlen != 16) { + proto_tree_add_text(subtree, tvb, off, + optlen, "UNICAST: malformed option"); + break; + } + tvb_memcpy(tvb, (guint8 *)&in6, off, sizeof(in6)); + proto_tree_add_text(subtree, tvb, off, + sizeof(in6), "IPv6 address: %s", + ip6_to_str(&in6)); + break; + case OPTION_STATUS_CODE: + { + guint16 status_code; + char *status_message = 0; + status_code = tvb_get_ntohs(tvb, off); + proto_tree_add_text(subtree, tvb, off, 2, + "Status Code: %s (%d)", + val_to_str(status_code, statuscode_vals, + "Unknown"), + status_code); + + if (optlen - 2 > 0) { + status_message = tvb_get_string(tvb, off + 2, optlen - 2); + proto_tree_add_text(subtree, tvb, off + 2, optlen - 2, + "Status Message: %s", + status_message); + g_free(status_message); + } + } + break; + case OPTION_VENDOR_CLASS: + if (optlen < 4) { + proto_tree_add_text(subtree, tvb, off, + optlen, "VENDOR_CLASS: malformed option"); + break; + } + proto_tree_add_text(subtree, tvb, off, 4, + "enterprise-number: %u", + tvb_get_ntohl(tvb, off)); + if (optlen > 4) { + proto_tree_add_text(subtree, tvb, off+4, optlen-4, + "vendor-class-data"); + } + break; + case OPTION_VENDOR_OPTS: + if (optlen < 4) { + proto_tree_add_text(subtree, tvb, off, + optlen, "VENDOR_OPTS: malformed option"); + break; + } + proto_tree_add_text(subtree, tvb, off, 4, + "enterprise-number: %u", + tvb_get_ntohl(tvb, off)); + if (optlen > 4) { + proto_tree_add_text(subtree, tvb, off+4, optlen-4, + "option-data"); + } + break; + case OPTION_INTERFACE_ID: + if (optlen == 0) { + proto_tree_add_text(subtree, tvb, off, + optlen, "INTERFACE_ID: malformed option"); + break; + } + proto_tree_add_text(subtree, tvb, off, optlen, "Interface-ID"); + break; + case OPTION_RECONF_MSG: + if (optlen != 1) { + proto_tree_add_text(subtree, tvb, off, + optlen, "RECONF_MSG: malformed option"); + break; + } + proto_tree_add_text(subtree, tvb, off, optlen, + "Reconfigure-type: %s", + val_to_str(tvb_get_guint8(tvb, off), + msgtype_vals, + "Message Type %u")); + break; + case OPTION_SIP_SERVER_D: + if (optlen > 0) { + proto_tree_add_text(subtree, tvb, off, optlen, + "SIP Servers Domain Search List"); + } + case OPTION_SIP_SERVER_A: + if (optlen % 16) { + proto_tree_add_text(subtree, tvb, off, optlen, + "SIP servers address: malformed option"); + break; + } + for (i = 0; i < optlen; i += 16) { + tvb_memcpy(tvb, (guint8 *)&in6, off + i, sizeof(in6)); + proto_tree_add_text(subtree, tvb, off + i, + sizeof(in6), "SIP servers address: %s", + ip6_to_str(&in6)); + } + break; + case OPTION_DNS_SERVERS: + if (optlen % 16) { + proto_tree_add_text(subtree, tvb, off, optlen, + "DNS servers address: malformed option"); + break; + } + for (i = 0; i < optlen; i += 16) { + tvb_memcpy(tvb, (guint8 *)&in6, off + i, sizeof(in6)); + proto_tree_add_text(subtree, tvb, off + i, + sizeof(in6), "DNS servers address: %s", + ip6_to_str(&in6)); + } + break; + case OPTION_DOMAIN_LIST: + if (optlen > 0) { + proto_tree_add_text(subtree, tvb, off, optlen, "DNS Domain Search List"); + } + break; + case OPTION_NIS_SERVERS: + if (optlen % 16) { + proto_tree_add_text(subtree, tvb, off, optlen, + "NIS servers address: malformed option"); + break; + } + for (i = 0; i < optlen; i += 16) { + tvb_memcpy(tvb, (guint8 *)&in6, off + i, sizeof(in6)); + proto_tree_add_text(subtree, tvb, off + i, + sizeof(in6), "NIS servers address: %s", + ip6_to_str(&in6)); + } + break; + case OPTION_NISP_SERVERS: + if (optlen % 16) { + proto_tree_add_text(subtree, tvb, off, optlen, + "NISP servers address: malformed option"); + break; + } + for (i = 0; i < optlen; i += 16) { + tvb_memcpy(tvb, (guint8 *)&in6, off + i, sizeof(in6)); + proto_tree_add_text(subtree, tvb, off + i, + sizeof(in6), "NISP servers address: %s", + ip6_to_str(&in6)); + } + break; + case OPTION_NIS_DOMAIN_NAME: + if (optlen > 0) { + proto_tree_add_text(subtree, tvb, off, optlen, "nis-domain-name"); + } + break; + case OPTION_NISP_DOMAIN_NAME: + if (optlen > 0) { + proto_tree_add_text(subtree, tvb, off, optlen, "nisp-domain-name"); + } + break; + case OPTION_NTP_SERVERS: + if (optlen % 16) { + proto_tree_add_text(subtree, tvb, off, optlen, + "NTP servers address: malformed option"); + break; + } + for (i = 0; i < optlen; i += 16) { + tvb_memcpy(tvb, (guint8 *)&in6, off + i, sizeof(in6)); + proto_tree_add_text(subtree, tvb, off + i, + sizeof(in6), "NTP servers address: %s", + ip6_to_str(&in6)); + } + break; + case OPTION_TIME_ZONE: + if (optlen > 0) { + proto_tree_add_text(subtree, tvb, off, optlen, "time-zone"); + } + break; + case OPTION_IAPREFIX: + { + guint32 preferred_lifetime, valid_lifetime; + guint8 prefix_length; + struct e_in6_addr in6; + + if (optlen < 25) { + proto_tree_add_text(subtree, tvb, off, + optlen, "IAPREFIX: malformed option"); + break; + } + + preferred_lifetime = tvb_get_ntohl(tvb, off); + valid_lifetime = tvb_get_ntohl(tvb, off + 4); + prefix_length = tvb_get_guint8(tvb, off + 8); + if (preferred_lifetime == DHCPV6_LEASEDURATION_INFINITY) { + proto_tree_add_text(subtree, tvb, off, 4, + "Preferred lifetime: infinity"); + } else { + proto_tree_add_text(subtree, tvb, off, 4, + "Preferred lifetime: %u", preferred_lifetime); + } + if (valid_lifetime == DHCPV6_LEASEDURATION_INFINITY) { + proto_tree_add_text(subtree, tvb, off + 4, 4, + "Valid lifetime: infinity"); + } else { + proto_tree_add_text(subtree, tvb, off + 4, 4, + "Valid lifetime: %u", valid_lifetime); + } + proto_tree_add_text(subtree, tvb, off + 8, 1, + "Prefix length: %d", prefix_length); + tvb_memcpy(tvb, (guint8 *)&in6, off + 9 , sizeof(in6)); + proto_tree_add_text(subtree, tvb, off + 9, + 16, "Prefix address: %s", + ip6_to_str(&in6)); + + temp_optlen = 25; + while ((optlen - temp_optlen) > 0) { + gboolean at_end_; + temp_optlen += dhcpv6_option(tvb, subtree, off+temp_optlen, off + optlen, &at_end_); + } + } + break; + } + + return 4 + optlen; +} + + +static void +dissect_dhcpv6(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, + gboolean downstream) +{ + proto_tree *bp_tree = NULL; + proto_item *ti; + guint8 msgtype, hop_count ; + guint32 xid; + int off = 0; + int eoff; + struct e_in6_addr in6; + gboolean at_end; + gboolean relay_msg_option = FALSE; + int length; + + eoff = tvb_reported_length(tvb); + downstream = 0; /* feature reserved */ + if (check_col(pinfo->cinfo, COL_PROTOCOL)) + col_set_str(pinfo->cinfo, COL_PROTOCOL, "DHCPv6"); + if (check_col(pinfo->cinfo, COL_INFO)) + col_clear(pinfo->cinfo, COL_INFO); + + msgtype = tvb_get_guint8(tvb, off); + + if (tree) { + ti = proto_tree_add_item(tree, proto_dhcpv6, tvb, 0, -1, FALSE); + bp_tree = proto_item_add_subtree(ti, ett_dhcpv6); + } + + while (msgtype == RELAY_FORW || msgtype == RELAY_REPLY) { + + if (check_col(pinfo->cinfo, COL_INFO)) { + col_set_str(pinfo->cinfo, COL_INFO, + val_to_str(msgtype, + msgtype_vals, + "Message Type %u")); + } + + proto_tree_add_uint(bp_tree, hf_dhcpv6_msgtype, tvb, off, 1, msgtype); + + hop_count = tvb_get_guint8(tvb, off+1); + proto_tree_add_text(bp_tree, tvb, off+1, 1, "Hop count: %d", hop_count); + + tvb_memcpy(tvb, (guint8 *)&in6, off+2, sizeof(in6)); + proto_tree_add_text(bp_tree, tvb, off+2, sizeof(in6), + "Link-address: %s",ip6_to_str(&in6)); + + tvb_memcpy(tvb, (guint8 *)&in6, off+18, sizeof(in6)); + proto_tree_add_text(bp_tree, tvb, off+18, sizeof(in6), + "Peer-address: %s",ip6_to_str(&in6)); + + off += 34; + relay_msg_option = FALSE; + + while (!relay_msg_option && off < eoff) { + length = dhcpv6_option(tvb, bp_tree, off, eoff, &at_end); + + if (tvb_get_ntohs(tvb, off) == OPTION_RELAY_MSG) { + relay_msg_option = TRUE; + off += 4; + } + else { + if (length > 0) + off += length; + else { + proto_tree_add_text(bp_tree, tvb, off, eoff, "Message: malformed"); + return; + } + } + } + + msgtype = tvb_get_guint8(tvb, off); + } + + xid = tvb_get_ntohl(tvb, off) & 0x00ffffff; + + if (!off) { + if (check_col(pinfo->cinfo, COL_INFO)) { + col_set_str(pinfo->cinfo, COL_INFO, + val_to_str(msgtype, + msgtype_vals, + "Message Type %u")); + } + } + + if (tree) { + proto_tree_add_uint(bp_tree, hf_dhcpv6_msgtype, tvb, off, 1, + msgtype); + proto_tree_add_text(bp_tree, tvb, off+1, 3, "Transaction-ID: 0x%08x", xid); +#if 0 + tvb_memcpy(tvb, (guint8 *)&in6, 4, sizeof(in6)); + proto_tree_add_text(bp_tree, tvb, 4, sizeof(in6), + "Server address: %s", ip6_to_str(&in6)); +#endif + } + + off += 4; + + at_end = FALSE; + while (off < eoff && !at_end) + off += dhcpv6_option(tvb, bp_tree, off, eoff, &at_end); +} + +static void +dissect_dhcpv6_downstream(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) +{ + dissect_dhcpv6(tvb, pinfo, tree, TRUE); +} + +static void +dissect_dhcpv6_upstream(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) +{ + dissect_dhcpv6(tvb, pinfo, tree, FALSE); +} + + +void +proto_register_dhcpv6(void) +{ + static hf_register_info hf[] = { + { &hf_dhcpv6_msgtype, + { "Message type", "dhcpv6.msgtype", FT_UINT8, + BASE_DEC, VALS(msgtype_vals), 0x0, + "", HFILL }}, + }; + static gint *ett[] = { + &ett_dhcpv6, + &ett_dhcpv6_option, + }; + + proto_dhcpv6 = proto_register_protocol("DHCPv6", "DHCPv6", "dhcpv6"); + proto_register_field_array(proto_dhcpv6, hf, array_length(hf)); + proto_register_subtree_array(ett, array_length(ett)); +} + +void +proto_reg_handoff_dhcpv6(void) +{ + dissector_handle_t dhcpv6_handle; + + dhcpv6_handle = create_dissector_handle(dissect_dhcpv6_downstream, + proto_dhcpv6); + dissector_add("udp.port", UDP_PORT_DHCPV6_DOWNSTREAM, dhcpv6_handle); + dhcpv6_handle = create_dissector_handle(dissect_dhcpv6_upstream, + proto_dhcpv6); + dissector_add("udp.port", UDP_PORT_DHCPV6_UPSTREAM, dhcpv6_handle); +} |