Adding upstream version 4.99.4.upstream/4.99.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 853 insertions, 0 deletions

diff --git a/print-dhcp6.c b/print-dhcp6.c
new file mode 100644
index 0000000..6b0dc21
--- /dev/null
+++ b/print-dhcp6.c
@@ -0,0 +1,853 @@
+/*
+ * Copyright (C) 1998 and 1999 WIDE Project.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/* \summary: IPv6 DHCP printer */
+
+/*
+ * RFC3315: DHCPv6
+ * supported DHCPv6 options:
+ *  RFC3319: Session Initiation Protocol (SIP) Servers options,
+ *  RFC3633: IPv6 Prefix options,
+ *  RFC3646: DNS Configuration options,
+ *  RFC3898: Network Information Service (NIS) Configuration options,
+ *  RFC4075: Simple Network Time Protocol (SNTP) Configuration option,
+ *  RFC4242: Information Refresh Time option,
+ *  RFC4280: Broadcast and Multicast Control Servers options,
+ *  RFC5908: Network Time Protocol (NTP) Server Option for DHCPv6
+ *  RFC6334: Dual-Stack Lite option,
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "netdissect-stdinc.h"
+
+#include "netdissect.h"
+#include "addrtoname.h"
+#include "extract.h"
+
+/* lease duration */
+#define DHCP6_DURATION_INFINITE 0xffffffff
+
+/* Error Values */
+#define DH6ERR_FAILURE		16
+#define DH6ERR_AUTHFAIL		17
+#define DH6ERR_POORLYFORMED	18
+#define DH6ERR_UNAVAIL		19
+#define DH6ERR_OPTUNAVAIL	20
+
+/* Message type */
+#define DH6_SOLICIT	1
+#define DH6_ADVERTISE	2
+#define DH6_REQUEST	3
+#define DH6_CONFIRM	4
+#define DH6_RENEW	5
+#define DH6_REBIND	6
+#define DH6_REPLY	7
+#define DH6_RELEASE	8
+#define DH6_DECLINE	9
+#define DH6_RECONFIGURE	10
+#define DH6_INFORM_REQ	11
+#define DH6_RELAY_FORW	12
+#define DH6_RELAY_REPLY	13
+#define DH6_LEASEQUERY	14
+#define DH6_LQ_REPLY	15
+
+static const struct tok dh6_msgtype_str[] = {
+	{ DH6_SOLICIT,     "solicit"          },
+	{ DH6_ADVERTISE,   "advertise"        },
+	{ DH6_REQUEST,     "request"          },
+	{ DH6_CONFIRM,     "confirm"          },
+	{ DH6_RENEW,       "renew"            },
+	{ DH6_REBIND,      "rebind"           },
+	{ DH6_REPLY,       "reply"            },
+	{ DH6_RELEASE,     "release"          },
+	{ DH6_DECLINE,     "decline"          },
+	{ DH6_RECONFIGURE, "reconfigure"      },
+	{ DH6_INFORM_REQ,  "inf-req"          },
+	{ DH6_RELAY_FORW,  "relay-fwd"        },
+	{ DH6_RELAY_REPLY, "relay-reply"      },
+	{ DH6_LEASEQUERY,  "leasequery"       },
+	{ DH6_LQ_REPLY,    "leasequery-reply" },
+	{ 0, NULL }
+};
+
+/* DHCP6 base packet format */
+struct dhcp6 {
+	union {
+		nd_uint8_t msgtype;
+		nd_uint32_t xid;
+	} dh6_msgtypexid;
+	/* options follow */
+};
+#define DH6_XIDMASK	0x00ffffff
+
+/* DHCPv6 relay messages */
+struct dhcp6_relay {
+	nd_uint8_t dh6relay_msgtype;
+	nd_uint8_t dh6relay_hcnt;
+	nd_ipv6    dh6relay_linkaddr;	/* XXX: badly aligned */
+	nd_ipv6    dh6relay_peeraddr;
+	/* options follow */
+};
+
+/* options */
+#define DH6OPT_CLIENTID	1
+#define DH6OPT_SERVERID	2
+#define DH6OPT_IA_NA 3
+#define DH6OPT_IA_TA 4
+#define DH6OPT_IA_ADDR 5
+#define DH6OPT_ORO 6
+#define DH6OPT_PREFERENCE 7
+#  define DH6OPT_PREF_MAX 255
+#define DH6OPT_ELAPSED_TIME 8
+#define DH6OPT_RELAY_MSG 9
+/*#define DH6OPT_SERVER_MSG 10 deprecated */
+#define DH6OPT_AUTH 11
+#  define DH6OPT_AUTHPROTO_DELAYED 2
+#  define DH6OPT_AUTHPROTO_RECONFIG 3
+#  define DH6OPT_AUTHALG_HMACMD5 1
+#  define DH6OPT_AUTHRDM_MONOCOUNTER 0
+#  define DH6OPT_AUTHRECONFIG_KEY 1
+#  define DH6OPT_AUTHRECONFIG_HMACMD5 2
+#define DH6OPT_UNICAST 12
+#define DH6OPT_STATUS_CODE 13
+#  define DH6OPT_STCODE_SUCCESS 0
+#  define DH6OPT_STCODE_UNSPECFAIL 1
+#  define DH6OPT_STCODE_NOADDRAVAIL 2
+#  define DH6OPT_STCODE_NOBINDING 3
+#  define DH6OPT_STCODE_NOTONLINK 4
+#  define DH6OPT_STCODE_USEMULTICAST 5
+#  define DH6OPT_STCODE_NOPREFIXAVAIL 6
+#  define DH6OPT_STCODE_UNKNOWNQUERYTYPE 7
+#  define DH6OPT_STCODE_MALFORMEDQUERY 8
+#  define DH6OPT_STCODE_NOTCONFIGURED 9
+#  define DH6OPT_STCODE_NOTALLOWED 10
+#define DH6OPT_RAPID_COMMIT 14
+#define DH6OPT_USER_CLASS 15
+#define DH6OPT_VENDOR_CLASS 16
+#define DH6OPT_VENDOR_OPTS 17
+#define DH6OPT_INTERFACE_ID 18
+#define DH6OPT_RECONF_MSG 19
+#define DH6OPT_RECONF_ACCEPT 20
+#define DH6OPT_SIP_SERVER_D 21
+#define DH6OPT_SIP_SERVER_A 22
+#define DH6OPT_DNS_SERVERS 23
+#define DH6OPT_DOMAIN_LIST 24
+#define DH6OPT_IA_PD 25
+#define DH6OPT_IA_PD_PREFIX 26
+#define DH6OPT_NIS_SERVERS 27
+#define DH6OPT_NISP_SERVERS 28
+#define DH6OPT_NIS_NAME 29
+#define DH6OPT_NISP_NAME 30
+#define DH6OPT_SNTP_SERVERS 31
+#define DH6OPT_LIFETIME 32
+#define DH6OPT_BCMCS_SERVER_D 33
+#define DH6OPT_BCMCS_SERVER_A 34
+#define DH6OPT_GEOCONF_CIVIC 36
+#define DH6OPT_REMOTE_ID 37
+#define DH6OPT_SUBSCRIBER_ID 38
+#define DH6OPT_CLIENT_FQDN 39
+#define DH6OPT_PANA_AGENT 40
+#define DH6OPT_NEW_POSIX_TIMEZONE 41
+#define DH6OPT_NEW_TZDB_TIMEZONE 42
+#define DH6OPT_ERO 43
+#define DH6OPT_LQ_QUERY 44
+#define DH6OPT_CLIENT_DATA 45
+#define DH6OPT_CLT_TIME 46
+#define DH6OPT_LQ_RELAY_DATA 47
+#define DH6OPT_LQ_CLIENT_LINK 48
+#define DH6OPT_NTP_SERVER 56
+#  define DH6OPT_NTP_SUBOPTION_SRV_ADDR 1
+#  define DH6OPT_NTP_SUBOPTION_MC_ADDR 2
+#  define DH6OPT_NTP_SUBOPTION_SRV_FQDN 3
+#define DH6OPT_AFTR_NAME 64
+#define DH6OPT_MUDURL 112
+
+static const struct tok dh6opt_str[] = {
+	{ DH6OPT_CLIENTID,           "client-ID"            },
+	{ DH6OPT_SERVERID,           "server-ID"            },
+	{ DH6OPT_IA_NA,              "IA_NA"                },
+	{ DH6OPT_IA_TA,              "IA_TA"                },
+	{ DH6OPT_IA_ADDR,            "IA_ADDR"              },
+	{ DH6OPT_ORO,                "option-request"       },
+	{ DH6OPT_PREFERENCE,         "preference"           },
+	{ DH6OPT_ELAPSED_TIME,       "elapsed-time"         },
+	{ DH6OPT_RELAY_MSG,          "relay-message"        },
+	{ DH6OPT_AUTH,               "authentication"       },
+	{ DH6OPT_UNICAST,            "server-unicast"       },
+	{ DH6OPT_STATUS_CODE,        "status-code"          },
+	{ DH6OPT_RAPID_COMMIT,       "rapid-commit"         },
+	{ DH6OPT_USER_CLASS,         "user-class"           },
+	{ DH6OPT_VENDOR_CLASS,       "vendor-class"         },
+	{ DH6OPT_VENDOR_OPTS,        "vendor-specific-info" },
+	{ DH6OPT_INTERFACE_ID,       "interface-ID"         },
+	{ DH6OPT_RECONF_MSG,         "reconfigure-message"  },
+	{ DH6OPT_RECONF_ACCEPT,      "reconfigure-accept"   },
+	{ DH6OPT_SIP_SERVER_D,       "SIP-servers-domain"   },
+	{ DH6OPT_SIP_SERVER_A,       "SIP-servers-address"  },
+	{ DH6OPT_DNS_SERVERS,        "DNS-server"           },
+	{ DH6OPT_DOMAIN_LIST,        "DNS-search-list"      },
+	{ DH6OPT_IA_PD,              "IA_PD"                },
+	{ DH6OPT_IA_PD_PREFIX,       "IA_PD-prefix"         },
+	{ DH6OPT_SNTP_SERVERS,       "SNTP-servers"         },
+	{ DH6OPT_LIFETIME,           "lifetime"             },
+	{ DH6OPT_NIS_SERVERS,        "NIS-server"           },
+	{ DH6OPT_NISP_SERVERS,       "NIS+-server"          },
+	{ DH6OPT_NIS_NAME,           "NIS-domain-name"      },
+	{ DH6OPT_NISP_NAME,          "NIS+-domain-name"     },
+	{ DH6OPT_BCMCS_SERVER_D,     "BCMCS-domain-name"    },
+	{ DH6OPT_BCMCS_SERVER_A,     "BCMCS-server"         },
+	{ DH6OPT_GEOCONF_CIVIC,      "Geoconf-Civic"        },
+	{ DH6OPT_REMOTE_ID,          "Remote-ID"            },
+	{ DH6OPT_SUBSCRIBER_ID,      "Subscriber-ID"        },
+	{ DH6OPT_CLIENT_FQDN,        "Client-FQDN"          },
+	{ DH6OPT_PANA_AGENT,         "PANA-agent"           },
+	{ DH6OPT_NEW_POSIX_TIMEZONE, "POSIX-timezone"       },
+	{ DH6OPT_NEW_TZDB_TIMEZONE,  "POSIX-tz-database"    },
+	{ DH6OPT_ERO,                "Echo-request-option"  },
+	{ DH6OPT_LQ_QUERY,           "Lease-query"          },
+	{ DH6OPT_CLIENT_DATA,        "LQ-client-data"       },
+	{ DH6OPT_CLT_TIME,           "Clt-time"             },
+	{ DH6OPT_LQ_RELAY_DATA,      "LQ-relay-data"        },
+	{ DH6OPT_LQ_CLIENT_LINK,     "LQ-client-link"       },
+	{ DH6OPT_NTP_SERVER,         "NTP-server"           },
+	{ DH6OPT_AFTR_NAME,          "AFTR-Name"            },
+	{ DH6OPT_MUDURL,             "MUD-URL"              },
+	{ 0, NULL }
+};
+
+static const struct tok dh6opt_stcode_str[] = {
+	{ DH6OPT_STCODE_SUCCESS,          "Success"          }, /* RFC3315 */
+	{ DH6OPT_STCODE_UNSPECFAIL,       "UnspecFail"       }, /* RFC3315 */
+	{ DH6OPT_STCODE_NOADDRAVAIL,      "NoAddrsAvail"     }, /* RFC3315 */
+	{ DH6OPT_STCODE_NOBINDING,        "NoBinding"        }, /* RFC3315 */
+	{ DH6OPT_STCODE_NOTONLINK,        "NotOnLink"        }, /* RFC3315 */
+	{ DH6OPT_STCODE_USEMULTICAST,     "UseMulticast"     }, /* RFC3315 */
+	{ DH6OPT_STCODE_NOPREFIXAVAIL,    "NoPrefixAvail"    }, /* RFC3633 */
+	{ DH6OPT_STCODE_UNKNOWNQUERYTYPE, "UnknownQueryType" }, /* RFC5007 */
+	{ DH6OPT_STCODE_MALFORMEDQUERY,   "MalformedQuery"   }, /* RFC5007 */
+	{ DH6OPT_STCODE_NOTCONFIGURED,    "NotConfigured"    }, /* RFC5007 */
+	{ DH6OPT_STCODE_NOTALLOWED,       "NotAllowed"       }, /* RFC5007 */
+	{ 0, NULL }
+};
+
+struct dhcp6opt {
+	nd_uint16_t dh6opt_type;
+	nd_uint16_t dh6opt_len;
+	/* type-dependent data follows */
+};
+
+static const char *
+dhcp6stcode(const uint16_t code)
+{
+	return code > 255 ? "INVALID code" : tok2str(dh6opt_stcode_str, "code%u", code);
+}
+
+static void
+dhcp6opt_print(netdissect_options *ndo,
+               const u_char *cp, const u_char *ep)
+{
+	const struct dhcp6opt *dh6o;
+	const u_char *tp;
+	u_int i;
+	uint16_t opttype;
+	uint16_t optlen;
+	uint8_t auth_proto;
+	uint8_t auth_alg;
+	uint8_t auth_rdm;
+	u_int authinfolen, authrealmlen;
+	u_int remain_len;  /* Length of remaining options */
+	u_int label_len;   /* Label length */
+	uint16_t subopt_code;
+	uint16_t subopt_len;
+	uint8_t dh6_reconf_type;
+	uint8_t dh6_lq_query_type;
+
+	if (cp == ep)
+		return;
+	while (cp < ep) {
+		if (ep < cp + sizeof(*dh6o))
+			goto trunc;
+		dh6o = (const struct dhcp6opt *)cp;
+		ND_TCHECK_SIZE(dh6o);
+		optlen = GET_BE_U_2(dh6o->dh6opt_len);
+		if (ep < cp + sizeof(*dh6o) + optlen)
+			goto trunc;
+		opttype = GET_BE_U_2(dh6o->dh6opt_type);
+		ND_PRINT(" (%s", tok2str(dh6opt_str, "opt_%u", opttype));
+		ND_TCHECK_LEN(cp + sizeof(*dh6o), optlen);
+		switch (opttype) {
+		case DH6OPT_CLIENTID:
+		case DH6OPT_SERVERID:
+			if (optlen < 2) {
+				/*(*/
+				ND_PRINT(" ?)");
+				break;
+			}
+			tp = (const u_char *)(dh6o + 1);
+			switch (GET_BE_U_2(tp)) {
+			case 1:
+				if (optlen >= 2 + 6) {
+					ND_PRINT(" hwaddr/time type %u time %u ",
+					    GET_BE_U_2(tp + 2),
+					    GET_BE_U_4(tp + 4));
+					for (i = 8; i < optlen; i++)
+						ND_PRINT("%02x",
+							 GET_U_1(tp + i));
+					/*(*/
+					ND_PRINT(")");
+				} else {
+					/*(*/
+					ND_PRINT(" ?)");
+				}
+				break;
+			case 2:
+				if (optlen >= 2 + 8) {
+					ND_PRINT(" vid ");
+					for (i = 2; i < 2 + 8; i++)
+						ND_PRINT("%02x",
+							 GET_U_1(tp + i));
+					/*(*/
+					ND_PRINT(")");
+				} else {
+					/*(*/
+					ND_PRINT(" ?)");
+				}
+				break;
+			case 3:
+				if (optlen >= 2 + 2) {
+					ND_PRINT(" hwaddr type %u ",
+					    GET_BE_U_2(tp + 2));
+					for (i = 4; i < optlen; i++)
+						ND_PRINT("%02x",
+							 GET_U_1(tp + i));
+					/*(*/
+					ND_PRINT(")");
+				} else {
+					/*(*/
+					ND_PRINT(" ?)");
+				}
+				break;
+			default:
+				ND_PRINT(" type %u)", GET_BE_U_2(tp));
+				break;
+			}
+			break;
+		case DH6OPT_IA_ADDR:
+			if (optlen < 24) {
+				/*(*/
+				ND_PRINT(" ?)");
+				break;
+			}
+			tp = (const u_char *)(dh6o + 1);
+			ND_PRINT(" %s", GET_IP6ADDR_STRING(tp));
+			ND_PRINT(" pltime:%u vltime:%u",
+			    GET_BE_U_4(tp + 16),
+			    GET_BE_U_4(tp + 20));
+			if (optlen > 24) {
+				/* there are sub-options */
+				dhcp6opt_print(ndo, tp + 24, tp + optlen);
+			}
+			ND_PRINT(")");
+			break;
+		case DH6OPT_ORO:
+		case DH6OPT_ERO:
+			if (optlen % 2) {
+				ND_PRINT(" ?)");
+				break;
+			}
+			tp = (const u_char *)(dh6o + 1);
+			for (i = 0; i < optlen; i += 2) {
+				ND_PRINT(" %s",
+				    tok2str(dh6opt_str, "opt_%u", GET_BE_U_2(tp + i)));
+			}
+			ND_PRINT(")");
+			break;
+		case DH6OPT_PREFERENCE:
+			if (optlen != 1) {
+				ND_PRINT(" ?)");
+				break;
+			}
+			tp = (const u_char *)(dh6o + 1);
+			ND_PRINT(" %u)", GET_U_1(tp));
+			break;
+		case DH6OPT_ELAPSED_TIME:
+			if (optlen != 2) {
+				ND_PRINT(" ?)");
+				break;
+			}
+			tp = (const u_char *)(dh6o + 1);
+			ND_PRINT(" %u)", GET_BE_U_2(tp));
+			break;
+		case DH6OPT_RELAY_MSG:
+		    {
+			const u_char *snapend_save;
+
+			ND_PRINT(" (");
+			tp = (const u_char *)(dh6o + 1);
+			/*
+			 * Update the snapend to the end of the option before
+			 * calling recursively dhcp6_print() for the nested
+			 * packet. Other options may be present after the
+			 * nested DHCPv6 packet. This prevents that, in
+			 * dhcp6_print(), for the nested DHCPv6 packet, the
+			 * remaining length < remaining caplen.
+			 */
+			snapend_save = ndo->ndo_snapend;
+			ndo->ndo_snapend = ND_MIN(tp + optlen, ndo->ndo_snapend);
+			dhcp6_print(ndo, tp, optlen);
+			ndo->ndo_snapend = snapend_save;
+			ND_PRINT(")");
+			break;
+		    }
+		case DH6OPT_AUTH:
+			if (optlen < 11) {
+				ND_PRINT(" ?)");
+				break;
+			}
+			tp = (const u_char *)(dh6o + 1);
+			auth_proto = GET_U_1(tp);
+			switch (auth_proto) {
+			case DH6OPT_AUTHPROTO_DELAYED:
+				ND_PRINT(" proto: delayed");
+				break;
+			case DH6OPT_AUTHPROTO_RECONFIG:
+				ND_PRINT(" proto: reconfigure");
+				break;
+			default:
+				ND_PRINT(" proto: %u", auth_proto);
+				break;
+			}
+			tp++;
+			auth_alg = GET_U_1(tp);
+			switch (auth_alg) {
+			case DH6OPT_AUTHALG_HMACMD5:
+				/* XXX: may depend on the protocol */
+				ND_PRINT(", alg: HMAC-MD5");
+				break;
+			default:
+				ND_PRINT(", alg: %u", auth_alg);
+				break;
+			}
+			tp++;
+			auth_rdm = GET_U_1(tp);
+			switch (auth_rdm) {
+			case DH6OPT_AUTHRDM_MONOCOUNTER:
+				ND_PRINT(", RDM: mono");
+				break;
+			default:
+				ND_PRINT(", RDM: %u", auth_rdm);
+				break;
+			}
+			tp++;
+			ND_PRINT(", RD:");
+			for (i = 0; i < 4; i++, tp += 2)
+				ND_PRINT(" %04x", GET_BE_U_2(tp));
+
+			/* protocol dependent part */
+			authinfolen = optlen - 11;
+			switch (auth_proto) {
+			case DH6OPT_AUTHPROTO_DELAYED:
+				if (authinfolen == 0)
+					break;
+				if (authinfolen < 20) {
+					ND_PRINT(" ??");
+					break;
+				}
+				authrealmlen = authinfolen - 20;
+				if (authrealmlen > 0) {
+					ND_PRINT(", realm: ");
+				}
+				for (i = 0; i < authrealmlen; i++, tp++)
+					ND_PRINT("%02x", GET_U_1(tp));
+				ND_PRINT(", key ID: %08x", GET_BE_U_4(tp));
+				tp += 4;
+				ND_PRINT(", HMAC-MD5:");
+				for (i = 0; i < 4; i++, tp+= 4)
+					ND_PRINT(" %08x", GET_BE_U_4(tp));
+				break;
+			case DH6OPT_AUTHPROTO_RECONFIG:
+				if (authinfolen != 17) {
+					ND_PRINT(" ??");
+					break;
+				}
+				switch (GET_U_1(tp)) {
+				case DH6OPT_AUTHRECONFIG_KEY:
+					ND_PRINT(" reconfig-key");
+					break;
+				case DH6OPT_AUTHRECONFIG_HMACMD5:
+					ND_PRINT(" type: HMAC-MD5");
+					break;
+				default:
+					ND_PRINT(" type: ??");
+					break;
+				}
+				tp++;
+				ND_PRINT(" value:");
+				for (i = 0; i < 4; i++, tp+= 4)
+					ND_PRINT(" %08x", GET_BE_U_4(tp));
+				break;
+			default:
+				ND_PRINT(" ??");
+				break;
+			}
+
+			ND_PRINT(")");
+			break;
+		case DH6OPT_RAPID_COMMIT: /* nothing todo */
+			ND_PRINT(")");
+			break;
+		case DH6OPT_INTERFACE_ID:
+		case DH6OPT_SUBSCRIBER_ID:
+			/*
+			 * Since we cannot predict the encoding, print hex dump
+			 * at most 10 characters.
+			 */
+			tp = (const u_char *)(dh6o + 1);
+			ND_PRINT(" ");
+			for (i = 0; i < optlen && i < 10; i++)
+				ND_PRINT("%02x", GET_U_1(tp + i));
+			ND_PRINT("...)");
+			break;
+		case DH6OPT_RECONF_MSG:
+			if (optlen != 1) {
+				ND_PRINT(" ?)");
+				break;
+			}
+			tp = (const u_char *)(dh6o + 1);
+			dh6_reconf_type = GET_U_1(tp);
+			switch (dh6_reconf_type) {
+			case DH6_RENEW:
+				ND_PRINT(" for renew)");
+				break;
+			case DH6_INFORM_REQ:
+				ND_PRINT(" for inf-req)");
+				break;
+			default:
+				ND_PRINT(" for ?\?\?(%02x))", dh6_reconf_type);
+				break;
+			}
+			break;
+		case DH6OPT_RECONF_ACCEPT: /* nothing todo */
+			ND_PRINT(")");
+			break;
+		case DH6OPT_SIP_SERVER_A:
+		case DH6OPT_DNS_SERVERS:
+		case DH6OPT_SNTP_SERVERS:
+		case DH6OPT_NIS_SERVERS:
+		case DH6OPT_NISP_SERVERS:
+		case DH6OPT_BCMCS_SERVER_A:
+		case DH6OPT_PANA_AGENT:
+		case DH6OPT_LQ_CLIENT_LINK:
+			if (optlen % 16) {
+				ND_PRINT(" ?)");
+				break;
+			}
+			tp = (const u_char *)(dh6o + 1);
+			for (i = 0; i < optlen; i += 16)
+				ND_PRINT(" %s", GET_IP6ADDR_STRING(tp + i));
+			ND_PRINT(")");
+			break;
+		case DH6OPT_SIP_SERVER_D:
+		case DH6OPT_DOMAIN_LIST:
+			tp = (const u_char *)(dh6o + 1);
+			while (tp < cp + sizeof(*dh6o) + optlen) {
+				ND_PRINT(" ");
+				if ((tp = fqdn_print(ndo, tp, cp + sizeof(*dh6o) + optlen)) == NULL)
+					goto trunc;
+			}
+			ND_PRINT(")");
+			break;
+		case DH6OPT_STATUS_CODE:
+			if (optlen < 2) {
+				ND_PRINT(" ?)");
+				break;
+			}
+			tp = (const u_char *)(dh6o + 1);
+			ND_PRINT(" %s)", dhcp6stcode(GET_BE_U_2(tp)));
+			break;
+		case DH6OPT_IA_NA:
+		case DH6OPT_IA_PD:
+			if (optlen < 12) {
+				ND_PRINT(" ?)");
+				break;
+			}
+			tp = (const u_char *)(dh6o + 1);
+			ND_PRINT(" IAID:%u T1:%u T2:%u",
+			    GET_BE_U_4(tp),
+			    GET_BE_U_4(tp + 4),
+			    GET_BE_U_4(tp + 8));
+			if (optlen > 12) {
+				/* there are sub-options */
+				dhcp6opt_print(ndo, tp + 12, tp + optlen);
+			}
+			ND_PRINT(")");
+			break;
+		case DH6OPT_IA_TA:
+			if (optlen < 4) {
+				ND_PRINT(" ?)");
+				break;
+			}
+			tp = (const u_char *)(dh6o + 1);
+			ND_PRINT(" IAID:%u", GET_BE_U_4(tp));
+			if (optlen > 4) {
+				/* there are sub-options */
+				dhcp6opt_print(ndo, tp + 4, tp + optlen);
+			}
+			ND_PRINT(")");
+			break;
+		case DH6OPT_IA_PD_PREFIX:
+			if (optlen < 25) {
+				ND_PRINT(" ?)");
+				break;
+			}
+			tp = (const u_char *)(dh6o + 1);
+			ND_PRINT(" %s/%u", GET_IP6ADDR_STRING(tp + 9),
+				 GET_U_1(tp + 8));
+			ND_PRINT(" pltime:%u vltime:%u",
+			    GET_BE_U_4(tp),
+			    GET_BE_U_4(tp + 4));
+			if (optlen > 25) {
+				/* there are sub-options */
+				dhcp6opt_print(ndo, tp + 25, tp + optlen);
+			}
+			ND_PRINT(")");
+			break;
+		case DH6OPT_LIFETIME:
+		case DH6OPT_CLT_TIME:
+			if (optlen != 4) {
+				ND_PRINT(" ?)");
+				break;
+			}
+			tp = (const u_char *)(dh6o + 1);
+			ND_PRINT(" %u)", GET_BE_U_4(tp));
+			break;
+		case DH6OPT_REMOTE_ID:
+			if (optlen < 4) {
+				ND_PRINT(" ?)");
+				break;
+			}
+			tp = (const u_char *)(dh6o + 1);
+			ND_PRINT(" %u ", GET_BE_U_4(tp));
+			/*
+			 * Print hex dump first 10 characters.
+			 */
+			for (i = 4; i < optlen && i < 14; i++)
+				ND_PRINT("%02x", GET_U_1(tp + i));
+			ND_PRINT("...)");
+			break;
+		case DH6OPT_LQ_QUERY:
+			if (optlen < 17) {
+				ND_PRINT(" ?)");
+				break;
+			}
+			tp = (const u_char *)(dh6o + 1);
+			dh6_lq_query_type = GET_U_1(tp);
+			switch (dh6_lq_query_type) {
+			case 1:
+				ND_PRINT(" by-address");
+				break;
+			case 2:
+				ND_PRINT(" by-clientID");
+				break;
+			default:
+				ND_PRINT(" type_%u", dh6_lq_query_type);
+				break;
+			}
+			ND_PRINT(" %s", GET_IP6ADDR_STRING(tp + 1));
+			if (optlen > 17) {
+				/* there are query-options */
+				dhcp6opt_print(ndo, tp + 17, tp + optlen);
+			}
+			ND_PRINT(")");
+			break;
+		case DH6OPT_CLIENT_DATA:
+			tp = (const u_char *)(dh6o + 1);
+			if (optlen > 0) {
+				/* there are encapsulated options */
+				dhcp6opt_print(ndo, tp, tp + optlen);
+			}
+			ND_PRINT(")");
+			break;
+		case DH6OPT_LQ_RELAY_DATA:
+			if (optlen < 16) {
+				ND_PRINT(" ?)");
+				break;
+			}
+			tp = (const u_char *)(dh6o + 1);
+			ND_PRINT(" %s ", GET_IP6ADDR_STRING(tp));
+			/*
+			 * Print hex dump first 10 characters.
+			 */
+			for (i = 16; i < optlen && i < 26; i++)
+				ND_PRINT("%02x", GET_U_1(tp + i));
+			ND_PRINT("...)");
+			break;
+		case DH6OPT_NTP_SERVER:
+			if (optlen < 4) {
+				ND_PRINT(" ?)");
+				break;
+			}
+			tp = (const u_char *)(dh6o + 1);
+			while (tp < cp + sizeof(*dh6o) + optlen - 4) {
+				subopt_code = GET_BE_U_2(tp);
+				tp += 2;
+				subopt_len = GET_BE_U_2(tp);
+				tp += 2;
+				if (tp + subopt_len > cp + sizeof(*dh6o) + optlen)
+					goto trunc;
+				ND_PRINT(" subopt:%u", subopt_code);
+				switch (subopt_code) {
+				case DH6OPT_NTP_SUBOPTION_SRV_ADDR:
+				case DH6OPT_NTP_SUBOPTION_MC_ADDR:
+					if (subopt_len != 16) {
+						ND_PRINT(" ?");
+						break;
+					}
+					ND_PRINT(" %s", GET_IP6ADDR_STRING(tp));
+					break;
+				case DH6OPT_NTP_SUBOPTION_SRV_FQDN:
+					ND_PRINT(" ");
+					if (fqdn_print(ndo, tp, tp + subopt_len) == NULL)
+						goto trunc;
+					break;
+				default:
+					ND_PRINT(" ?");
+					break;
+				}
+				tp += subopt_len;
+			}
+			ND_PRINT(")");
+			break;
+		case DH6OPT_AFTR_NAME:
+			if (optlen < 3) {
+				ND_PRINT(" ?)");
+				break;
+			}
+			tp = (const u_char *)(dh6o + 1);
+			remain_len = optlen;
+			ND_PRINT(" ");
+			/* Encoding is described in section 3.1 of RFC 1035 */
+			while (remain_len && GET_U_1(tp)) {
+				label_len = GET_U_1(tp);
+				tp++;
+				if (label_len < remain_len - 1) {
+					nd_printjnp(ndo, tp, label_len);
+					tp += label_len;
+					remain_len -= (label_len + 1);
+					if(GET_U_1(tp)) ND_PRINT(".");
+				} else {
+					ND_PRINT(" ?");
+					break;
+				}
+			}
+			ND_PRINT(")");
+			break;
+		case DH6OPT_NEW_POSIX_TIMEZONE: /* all three of these options */
+		case DH6OPT_NEW_TZDB_TIMEZONE:	/* are encoded similarly */
+		case DH6OPT_MUDURL:		/* although GMT might not work */
+		        if (optlen < 5) {
+				ND_PRINT(" ?)");
+				break;
+			}
+			tp = (const u_char *)(dh6o + 1);
+			ND_PRINT(" ");
+			nd_printjnp(ndo, tp, optlen);
+			ND_PRINT(")");
+			break;
+
+		default:
+			ND_PRINT(")");
+			break;
+		}
+
+		cp += sizeof(*dh6o) + optlen;
+	}
+	return;
+
+trunc:
+	nd_print_trunc(ndo);
+}
+
+/*
+ * Print dhcp6 packets
+ */
+void
+dhcp6_print(netdissect_options *ndo,
+            const u_char *cp, u_int length)
+{
+	const struct dhcp6 *dh6;
+	const struct dhcp6_relay *dh6relay;
+	uint8_t msgtype;
+	const u_char *ep;
+	const u_char *extp;
+	const char *name;
+
+	ndo->ndo_protocol = "dhcp6";
+	ND_PRINT("dhcp6");
+
+	ep = ndo->ndo_snapend;
+	if (cp + length < ep)
+		ep = cp + length;
+
+	dh6 = (const struct dhcp6 *)cp;
+	dh6relay = (const struct dhcp6_relay *)cp;
+	ND_TCHECK_4(dh6->dh6_msgtypexid.xid);
+	msgtype = GET_U_1(dh6->dh6_msgtypexid.msgtype);
+	name = tok2str(dh6_msgtype_str, "msgtype-%u", msgtype);
+
+	if (!ndo->ndo_vflag) {
+		ND_PRINT(" %s", name);
+		return;
+	}
+
+	/* XXX relay agent messages have to be handled differently */
+
+	ND_PRINT(" %s (", name);	/*)*/
+	if (msgtype != DH6_RELAY_FORW && msgtype != DH6_RELAY_REPLY) {
+		ND_PRINT("xid=%x",
+			 GET_BE_U_4(dh6->dh6_msgtypexid.xid) & DH6_XIDMASK);
+		extp = (const u_char *)(dh6 + 1);
+		dhcp6opt_print(ndo, extp, ep);
+	} else {		/* relay messages */
+		ND_PRINT("linkaddr=%s", GET_IP6ADDR_STRING(dh6relay->dh6relay_linkaddr));
+
+		ND_PRINT(" peeraddr=%s", GET_IP6ADDR_STRING(dh6relay->dh6relay_peeraddr));
+
+		dhcp6opt_print(ndo, (const u_char *)(dh6relay + 1), ep);
+	}
+	/*(*/
+	ND_PRINT(")");
+	return;
+
+trunc:
+	nd_print_trunc(ndo);
+}