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Member "tcpdump-4.99.1/./print-dhcp6.c" (7 Jun 2021, 23543 Bytes) of package /linux/misc/tcpdump-4.99.1.tar.gz:


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    1 /*
    2  * Copyright (C) 1998 and 1999 WIDE Project.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. Neither the name of the project nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  */
   29 
   30 /* \summary: IPv6 DHCP printer */
   31 
   32 /*
   33  * RFC3315: DHCPv6
   34  * supported DHCPv6 options:
   35  *  RFC3319: Session Initiation Protocol (SIP) Servers options,
   36  *  RFC3633: IPv6 Prefix options,
   37  *  RFC3646: DNS Configuration options,
   38  *  RFC3898: Network Information Service (NIS) Configuration options,
   39  *  RFC4075: Simple Network Time Protocol (SNTP) Configuration option,
   40  *  RFC4242: Information Refresh Time option,
   41  *  RFC4280: Broadcast and Multicast Control Servers options,
   42  *  RFC5908: Network Time Protocol (NTP) Server Option for DHCPv6
   43  *  RFC6334: Dual-Stack Lite option,
   44  */
   45 
   46 #ifdef HAVE_CONFIG_H
   47 #include <config.h>
   48 #endif
   49 
   50 #include "netdissect-stdinc.h"
   51 
   52 #include "netdissect.h"
   53 #include "addrtoname.h"
   54 #include "extract.h"
   55 
   56 /* lease duration */
   57 #define DHCP6_DURATION_INFINITE 0xffffffff
   58 
   59 /* Error Values */
   60 #define DH6ERR_FAILURE      16
   61 #define DH6ERR_AUTHFAIL     17
   62 #define DH6ERR_POORLYFORMED 18
   63 #define DH6ERR_UNAVAIL      19
   64 #define DH6ERR_OPTUNAVAIL   20
   65 
   66 /* Message type */
   67 #define DH6_SOLICIT 1
   68 #define DH6_ADVERTISE   2
   69 #define DH6_REQUEST 3
   70 #define DH6_CONFIRM 4
   71 #define DH6_RENEW   5
   72 #define DH6_REBIND  6
   73 #define DH6_REPLY   7
   74 #define DH6_RELEASE 8
   75 #define DH6_DECLINE 9
   76 #define DH6_RECONFIGURE 10
   77 #define DH6_INFORM_REQ  11
   78 #define DH6_RELAY_FORW  12
   79 #define DH6_RELAY_REPLY 13
   80 #define DH6_LEASEQUERY  14
   81 #define DH6_LQ_REPLY    15
   82 
   83 static const struct tok dh6_msgtype_str[] = {
   84     { DH6_SOLICIT,     "solicit"          },
   85     { DH6_ADVERTISE,   "advertise"        },
   86     { DH6_REQUEST,     "request"          },
   87     { DH6_CONFIRM,     "confirm"          },
   88     { DH6_RENEW,       "renew"            },
   89     { DH6_REBIND,      "rebind"           },
   90     { DH6_REPLY,       "reply"            },
   91     { DH6_RELEASE,     "release"          },
   92     { DH6_DECLINE,     "decline"          },
   93     { DH6_RECONFIGURE, "reconfigure"      },
   94     { DH6_INFORM_REQ,  "inf-req"          },
   95     { DH6_RELAY_FORW,  "relay-fwd"        },
   96     { DH6_RELAY_REPLY, "relay-reply"      },
   97     { DH6_LEASEQUERY,  "leasequery"       },
   98     { DH6_LQ_REPLY,    "leasequery-reply" },
   99     { 0, NULL }
  100 };
  101 
  102 /* DHCP6 base packet format */
  103 struct dhcp6 {
  104     union {
  105         nd_uint8_t msgtype;
  106         nd_uint32_t xid;
  107     } dh6_msgtypexid;
  108     /* options follow */
  109 };
  110 #define DH6_XIDMASK 0x00ffffff
  111 
  112 /* DHCPv6 relay messages */
  113 struct dhcp6_relay {
  114     nd_uint8_t dh6relay_msgtype;
  115     nd_uint8_t dh6relay_hcnt;
  116     nd_ipv6    dh6relay_linkaddr;   /* XXX: badly aligned */
  117     nd_ipv6    dh6relay_peeraddr;
  118     /* options follow */
  119 };
  120 
  121 /* options */
  122 #define DH6OPT_CLIENTID 1
  123 #define DH6OPT_SERVERID 2
  124 #define DH6OPT_IA_NA 3
  125 #define DH6OPT_IA_TA 4
  126 #define DH6OPT_IA_ADDR 5
  127 #define DH6OPT_ORO 6
  128 #define DH6OPT_PREFERENCE 7
  129 #  define DH6OPT_PREF_MAX 255
  130 #define DH6OPT_ELAPSED_TIME 8
  131 #define DH6OPT_RELAY_MSG 9
  132 /*#define DH6OPT_SERVER_MSG 10 deprecated */
  133 #define DH6OPT_AUTH 11
  134 #  define DH6OPT_AUTHPROTO_DELAYED 2
  135 #  define DH6OPT_AUTHPROTO_RECONFIG 3
  136 #  define DH6OPT_AUTHALG_HMACMD5 1
  137 #  define DH6OPT_AUTHRDM_MONOCOUNTER 0
  138 #  define DH6OPT_AUTHRECONFIG_KEY 1
  139 #  define DH6OPT_AUTHRECONFIG_HMACMD5 2
  140 #define DH6OPT_UNICAST 12
  141 #define DH6OPT_STATUS_CODE 13
  142 #  define DH6OPT_STCODE_SUCCESS 0
  143 #  define DH6OPT_STCODE_UNSPECFAIL 1
  144 #  define DH6OPT_STCODE_NOADDRAVAIL 2
  145 #  define DH6OPT_STCODE_NOBINDING 3
  146 #  define DH6OPT_STCODE_NOTONLINK 4
  147 #  define DH6OPT_STCODE_USEMULTICAST 5
  148 #  define DH6OPT_STCODE_NOPREFIXAVAIL 6
  149 #  define DH6OPT_STCODE_UNKNOWNQUERYTYPE 7
  150 #  define DH6OPT_STCODE_MALFORMEDQUERY 8
  151 #  define DH6OPT_STCODE_NOTCONFIGURED 9
  152 #  define DH6OPT_STCODE_NOTALLOWED 10
  153 #define DH6OPT_RAPID_COMMIT 14
  154 #define DH6OPT_USER_CLASS 15
  155 #define DH6OPT_VENDOR_CLASS 16
  156 #define DH6OPT_VENDOR_OPTS 17
  157 #define DH6OPT_INTERFACE_ID 18
  158 #define DH6OPT_RECONF_MSG 19
  159 #define DH6OPT_RECONF_ACCEPT 20
  160 #define DH6OPT_SIP_SERVER_D 21
  161 #define DH6OPT_SIP_SERVER_A 22
  162 #define DH6OPT_DNS_SERVERS 23
  163 #define DH6OPT_DOMAIN_LIST 24
  164 #define DH6OPT_IA_PD 25
  165 #define DH6OPT_IA_PD_PREFIX 26
  166 #define DH6OPT_NIS_SERVERS 27
  167 #define DH6OPT_NISP_SERVERS 28
  168 #define DH6OPT_NIS_NAME 29
  169 #define DH6OPT_NISP_NAME 30
  170 #define DH6OPT_SNTP_SERVERS 31
  171 #define DH6OPT_LIFETIME 32
  172 #define DH6OPT_BCMCS_SERVER_D 33
  173 #define DH6OPT_BCMCS_SERVER_A 34
  174 #define DH6OPT_GEOCONF_CIVIC 36
  175 #define DH6OPT_REMOTE_ID 37
  176 #define DH6OPT_SUBSCRIBER_ID 38
  177 #define DH6OPT_CLIENT_FQDN 39
  178 #define DH6OPT_PANA_AGENT 40
  179 #define DH6OPT_NEW_POSIX_TIMEZONE 41
  180 #define DH6OPT_NEW_TZDB_TIMEZONE 42
  181 #define DH6OPT_ERO 43
  182 #define DH6OPT_LQ_QUERY 44
  183 #define DH6OPT_CLIENT_DATA 45
  184 #define DH6OPT_CLT_TIME 46
  185 #define DH6OPT_LQ_RELAY_DATA 47
  186 #define DH6OPT_LQ_CLIENT_LINK 48
  187 #define DH6OPT_NTP_SERVER 56
  188 #  define DH6OPT_NTP_SUBOPTION_SRV_ADDR 1
  189 #  define DH6OPT_NTP_SUBOPTION_MC_ADDR 2
  190 #  define DH6OPT_NTP_SUBOPTION_SRV_FQDN 3
  191 #define DH6OPT_AFTR_NAME 64
  192 #define DH6OPT_MUDURL 112
  193 
  194 static const struct tok dh6opt_str[] = {
  195     { DH6OPT_CLIENTID,           "client-ID"            },
  196     { DH6OPT_SERVERID,           "server-ID"            },
  197     { DH6OPT_IA_NA,              "IA_NA"                },
  198     { DH6OPT_IA_TA,              "IA_TA"                },
  199     { DH6OPT_IA_ADDR,            "IA_ADDR"              },
  200     { DH6OPT_ORO,                "option-request"       },
  201     { DH6OPT_PREFERENCE,         "preference"           },
  202     { DH6OPT_ELAPSED_TIME,       "elapsed-time"         },
  203     { DH6OPT_RELAY_MSG,          "relay-message"        },
  204     { DH6OPT_AUTH,               "authentication"       },
  205     { DH6OPT_UNICAST,            "server-unicast"       },
  206     { DH6OPT_STATUS_CODE,        "status-code"          },
  207     { DH6OPT_RAPID_COMMIT,       "rapid-commit"         },
  208     { DH6OPT_USER_CLASS,         "user-class"           },
  209     { DH6OPT_VENDOR_CLASS,       "vendor-class"         },
  210     { DH6OPT_VENDOR_OPTS,        "vendor-specific-info" },
  211     { DH6OPT_INTERFACE_ID,       "interface-ID"         },
  212     { DH6OPT_RECONF_MSG,         "reconfigure-message"  },
  213     { DH6OPT_RECONF_ACCEPT,      "reconfigure-accept"   },
  214     { DH6OPT_SIP_SERVER_D,       "SIP-servers-domain"   },
  215     { DH6OPT_SIP_SERVER_A,       "SIP-servers-address"  },
  216     { DH6OPT_DNS_SERVERS,        "DNS-server"           },
  217     { DH6OPT_DOMAIN_LIST,        "DNS-search-list"      },
  218     { DH6OPT_IA_PD,              "IA_PD"                },
  219     { DH6OPT_IA_PD_PREFIX,       "IA_PD-prefix"         },
  220     { DH6OPT_SNTP_SERVERS,       "SNTP-servers"         },
  221     { DH6OPT_LIFETIME,           "lifetime"             },
  222     { DH6OPT_NIS_SERVERS,        "NIS-server"           },
  223     { DH6OPT_NISP_SERVERS,       "NIS+-server"          },
  224     { DH6OPT_NIS_NAME,           "NIS-domain-name"      },
  225     { DH6OPT_NISP_NAME,          "NIS+-domain-name"     },
  226     { DH6OPT_BCMCS_SERVER_D,     "BCMCS-domain-name"    },
  227     { DH6OPT_BCMCS_SERVER_A,     "BCMCS-server"         },
  228     { DH6OPT_GEOCONF_CIVIC,      "Geoconf-Civic"        },
  229     { DH6OPT_REMOTE_ID,          "Remote-ID"            },
  230     { DH6OPT_SUBSCRIBER_ID,      "Subscriber-ID"        },
  231     { DH6OPT_CLIENT_FQDN,        "Client-FQDN"          },
  232     { DH6OPT_PANA_AGENT,         "PANA-agent"           },
  233     { DH6OPT_NEW_POSIX_TIMEZONE, "POSIX-timezone"       },
  234     { DH6OPT_NEW_TZDB_TIMEZONE,  "POSIX-tz-database"    },
  235     { DH6OPT_ERO,                "Echo-request-option"  },
  236     { DH6OPT_LQ_QUERY,           "Lease-query"          },
  237     { DH6OPT_CLIENT_DATA,        "LQ-client-data"       },
  238     { DH6OPT_CLT_TIME,           "Clt-time"             },
  239     { DH6OPT_LQ_RELAY_DATA,      "LQ-relay-data"        },
  240     { DH6OPT_LQ_CLIENT_LINK,     "LQ-client-link"       },
  241     { DH6OPT_NTP_SERVER,         "NTP-server"           },
  242     { DH6OPT_AFTR_NAME,          "AFTR-Name"            },
  243     { DH6OPT_MUDURL,             "MUD-URL"              },
  244     { 0, NULL }
  245 };
  246 
  247 static const struct tok dh6opt_stcode_str[] = {
  248     { DH6OPT_STCODE_SUCCESS,          "Success"          }, /* RFC3315 */
  249     { DH6OPT_STCODE_UNSPECFAIL,       "UnspecFail"       }, /* RFC3315 */
  250     { DH6OPT_STCODE_NOADDRAVAIL,      "NoAddrsAvail"     }, /* RFC3315 */
  251     { DH6OPT_STCODE_NOBINDING,        "NoBinding"        }, /* RFC3315 */
  252     { DH6OPT_STCODE_NOTONLINK,        "NotOnLink"        }, /* RFC3315 */
  253     { DH6OPT_STCODE_USEMULTICAST,     "UseMulticast"     }, /* RFC3315 */
  254     { DH6OPT_STCODE_NOPREFIXAVAIL,    "NoPrefixAvail"    }, /* RFC3633 */
  255     { DH6OPT_STCODE_UNKNOWNQUERYTYPE, "UnknownQueryType" }, /* RFC5007 */
  256     { DH6OPT_STCODE_MALFORMEDQUERY,   "MalformedQuery"   }, /* RFC5007 */
  257     { DH6OPT_STCODE_NOTCONFIGURED,    "NotConfigured"    }, /* RFC5007 */
  258     { DH6OPT_STCODE_NOTALLOWED,       "NotAllowed"       }, /* RFC5007 */
  259     { 0, NULL }
  260 };
  261 
  262 struct dhcp6opt {
  263     nd_uint16_t dh6opt_type;
  264     nd_uint16_t dh6opt_len;
  265     /* type-dependent data follows */
  266 };
  267 
  268 static const char *
  269 dhcp6stcode(const uint16_t code)
  270 {
  271     return code > 255 ? "INVALID code" : tok2str(dh6opt_stcode_str, "code%u", code);
  272 }
  273 
  274 static void
  275 dhcp6opt_print(netdissect_options *ndo,
  276                const u_char *cp, const u_char *ep)
  277 {
  278     const struct dhcp6opt *dh6o;
  279     const u_char *tp;
  280     u_int i;
  281     uint16_t opttype;
  282     uint16_t optlen;
  283     uint8_t auth_proto;
  284     uint8_t auth_alg;
  285     uint8_t auth_rdm;
  286     u_int authinfolen, authrealmlen;
  287     u_int remain_len;  /* Length of remaining options */
  288     u_int label_len;   /* Label length */
  289     uint16_t subopt_code;
  290     uint16_t subopt_len;
  291     uint8_t dh6_reconf_type;
  292     uint8_t dh6_lq_query_type;
  293 
  294     if (cp == ep)
  295         return;
  296     while (cp < ep) {
  297         if (ep < cp + sizeof(*dh6o))
  298             goto trunc;
  299         dh6o = (const struct dhcp6opt *)cp;
  300         ND_TCHECK_SIZE(dh6o);
  301         optlen = GET_BE_U_2(dh6o->dh6opt_len);
  302         if (ep < cp + sizeof(*dh6o) + optlen)
  303             goto trunc;
  304         opttype = GET_BE_U_2(dh6o->dh6opt_type);
  305         ND_PRINT(" (%s", tok2str(dh6opt_str, "opt_%u", opttype));
  306         ND_TCHECK_LEN(cp + sizeof(*dh6o), optlen);
  307         switch (opttype) {
  308         case DH6OPT_CLIENTID:
  309         case DH6OPT_SERVERID:
  310             if (optlen < 2) {
  311                 /*(*/
  312                 ND_PRINT(" ?)");
  313                 break;
  314             }
  315             tp = (const u_char *)(dh6o + 1);
  316             switch (GET_BE_U_2(tp)) {
  317             case 1:
  318                 if (optlen >= 2 + 6) {
  319                     ND_PRINT(" hwaddr/time type %u time %u ",
  320                         GET_BE_U_2(tp + 2),
  321                         GET_BE_U_4(tp + 4));
  322                     for (i = 8; i < optlen; i++)
  323                         ND_PRINT("%02x",
  324                              GET_U_1(tp + i));
  325                     /*(*/
  326                     ND_PRINT(")");
  327                 } else {
  328                     /*(*/
  329                     ND_PRINT(" ?)");
  330                 }
  331                 break;
  332             case 2:
  333                 if (optlen >= 2 + 8) {
  334                     ND_PRINT(" vid ");
  335                     for (i = 2; i < 2 + 8; i++)
  336                         ND_PRINT("%02x",
  337                              GET_U_1(tp + i));
  338                     /*(*/
  339                     ND_PRINT(")");
  340                 } else {
  341                     /*(*/
  342                     ND_PRINT(" ?)");
  343                 }
  344                 break;
  345             case 3:
  346                 if (optlen >= 2 + 2) {
  347                     ND_PRINT(" hwaddr type %u ",
  348                         GET_BE_U_2(tp + 2));
  349                     for (i = 4; i < optlen; i++)
  350                         ND_PRINT("%02x",
  351                              GET_U_1(tp + i));
  352                     /*(*/
  353                     ND_PRINT(")");
  354                 } else {
  355                     /*(*/
  356                     ND_PRINT(" ?)");
  357                 }
  358                 break;
  359             default:
  360                 ND_PRINT(" type %u)", GET_BE_U_2(tp));
  361                 break;
  362             }
  363             break;
  364         case DH6OPT_IA_ADDR:
  365             if (optlen < 24) {
  366                 /*(*/
  367                 ND_PRINT(" ?)");
  368                 break;
  369             }
  370             tp = (const u_char *)(dh6o + 1);
  371             ND_PRINT(" %s", GET_IP6ADDR_STRING(tp));
  372             ND_PRINT(" pltime:%u vltime:%u",
  373                 GET_BE_U_4(tp + 16),
  374                 GET_BE_U_4(tp + 20));
  375             if (optlen > 24) {
  376                 /* there are sub-options */
  377                 dhcp6opt_print(ndo, tp + 24, tp + optlen);
  378             }
  379             ND_PRINT(")");
  380             break;
  381         case DH6OPT_ORO:
  382         case DH6OPT_ERO:
  383             if (optlen % 2) {
  384                 ND_PRINT(" ?)");
  385                 break;
  386             }
  387             tp = (const u_char *)(dh6o + 1);
  388             for (i = 0; i < optlen; i += 2) {
  389                 ND_PRINT(" %s",
  390                     tok2str(dh6opt_str, "opt_%u", GET_BE_U_2(tp + i)));
  391             }
  392             ND_PRINT(")");
  393             break;
  394         case DH6OPT_PREFERENCE:
  395             if (optlen != 1) {
  396                 ND_PRINT(" ?)");
  397                 break;
  398             }
  399             tp = (const u_char *)(dh6o + 1);
  400             ND_PRINT(" %u)", GET_U_1(tp));
  401             break;
  402         case DH6OPT_ELAPSED_TIME:
  403             if (optlen != 2) {
  404                 ND_PRINT(" ?)");
  405                 break;
  406             }
  407             tp = (const u_char *)(dh6o + 1);
  408             ND_PRINT(" %u)", GET_BE_U_2(tp));
  409             break;
  410         case DH6OPT_RELAY_MSG:
  411             {
  412             const u_char *snapend_save;
  413 
  414             ND_PRINT(" (");
  415             tp = (const u_char *)(dh6o + 1);
  416             /*
  417              * Update the snapend to the end of the option before
  418              * calling recursively dhcp6_print() for the nested
  419              * packet. Other options may be present after the
  420              * nested DHCPv6 packet. This prevents that, in
  421              * dhcp6_print(), for the nested DHCPv6 packet, the
  422              * remaining length < remaining caplen.
  423              */
  424             snapend_save = ndo->ndo_snapend;
  425             ndo->ndo_snapend = ND_MIN(tp + optlen, ndo->ndo_snapend);
  426             dhcp6_print(ndo, tp, optlen);
  427             ndo->ndo_snapend = snapend_save;
  428             ND_PRINT(")");
  429             break;
  430             }
  431         case DH6OPT_AUTH:
  432             if (optlen < 11) {
  433                 ND_PRINT(" ?)");
  434                 break;
  435             }
  436             tp = (const u_char *)(dh6o + 1);
  437             auth_proto = GET_U_1(tp);
  438             switch (auth_proto) {
  439             case DH6OPT_AUTHPROTO_DELAYED:
  440                 ND_PRINT(" proto: delayed");
  441                 break;
  442             case DH6OPT_AUTHPROTO_RECONFIG:
  443                 ND_PRINT(" proto: reconfigure");
  444                 break;
  445             default:
  446                 ND_PRINT(" proto: %u", auth_proto);
  447                 break;
  448             }
  449             tp++;
  450             auth_alg = GET_U_1(tp);
  451             switch (auth_alg) {
  452             case DH6OPT_AUTHALG_HMACMD5:
  453                 /* XXX: may depend on the protocol */
  454                 ND_PRINT(", alg: HMAC-MD5");
  455                 break;
  456             default:
  457                 ND_PRINT(", alg: %u", auth_alg);
  458                 break;
  459             }
  460             tp++;
  461             auth_rdm = GET_U_1(tp);
  462             switch (auth_rdm) {
  463             case DH6OPT_AUTHRDM_MONOCOUNTER:
  464                 ND_PRINT(", RDM: mono");
  465                 break;
  466             default:
  467                 ND_PRINT(", RDM: %u", auth_rdm);
  468                 break;
  469             }
  470             tp++;
  471             ND_PRINT(", RD:");
  472             for (i = 0; i < 4; i++, tp += 2)
  473                 ND_PRINT(" %04x", GET_BE_U_2(tp));
  474 
  475             /* protocol dependent part */
  476             authinfolen = optlen - 11;
  477             switch (auth_proto) {
  478             case DH6OPT_AUTHPROTO_DELAYED:
  479                 if (authinfolen == 0)
  480                     break;
  481                 if (authinfolen < 20) {
  482                     ND_PRINT(" ??");
  483                     break;
  484                 }
  485                 authrealmlen = authinfolen - 20;
  486                 if (authrealmlen > 0) {
  487                     ND_PRINT(", realm: ");
  488                 }
  489                 for (i = 0; i < authrealmlen; i++, tp++)
  490                     ND_PRINT("%02x", GET_U_1(tp));
  491                 ND_PRINT(", key ID: %08x", GET_BE_U_4(tp));
  492                 tp += 4;
  493                 ND_PRINT(", HMAC-MD5:");
  494                 for (i = 0; i < 4; i++, tp+= 4)
  495                     ND_PRINT(" %08x", GET_BE_U_4(tp));
  496                 break;
  497             case DH6OPT_AUTHPROTO_RECONFIG:
  498                 if (authinfolen != 17) {
  499                     ND_PRINT(" ??");
  500                     break;
  501                 }
  502                 switch (GET_U_1(tp)) {
  503                 case DH6OPT_AUTHRECONFIG_KEY:
  504                     ND_PRINT(" reconfig-key");
  505                     break;
  506                 case DH6OPT_AUTHRECONFIG_HMACMD5:
  507                     ND_PRINT(" type: HMAC-MD5");
  508                     break;
  509                 default:
  510                     ND_PRINT(" type: ??");
  511                     break;
  512                 }
  513                 tp++;
  514                 ND_PRINT(" value:");
  515                 for (i = 0; i < 4; i++, tp+= 4)
  516                     ND_PRINT(" %08x", GET_BE_U_4(tp));
  517                 break;
  518             default:
  519                 ND_PRINT(" ??");
  520                 break;
  521             }
  522 
  523             ND_PRINT(")");
  524             break;
  525         case DH6OPT_RAPID_COMMIT: /* nothing todo */
  526             ND_PRINT(")");
  527             break;
  528         case DH6OPT_INTERFACE_ID:
  529         case DH6OPT_SUBSCRIBER_ID:
  530             /*
  531              * Since we cannot predict the encoding, print hex dump
  532              * at most 10 characters.
  533              */
  534             tp = (const u_char *)(dh6o + 1);
  535             ND_PRINT(" ");
  536             for (i = 0; i < optlen && i < 10; i++)
  537                 ND_PRINT("%02x", GET_U_1(tp + i));
  538             ND_PRINT("...)");
  539             break;
  540         case DH6OPT_RECONF_MSG:
  541             if (optlen != 1) {
  542                 ND_PRINT(" ?)");
  543                 break;
  544             }
  545             tp = (const u_char *)(dh6o + 1);
  546             dh6_reconf_type = GET_U_1(tp);
  547             switch (dh6_reconf_type) {
  548             case DH6_RENEW:
  549                 ND_PRINT(" for renew)");
  550                 break;
  551             case DH6_INFORM_REQ:
  552                 ND_PRINT(" for inf-req)");
  553                 break;
  554             default:
  555                 ND_PRINT(" for ?\?\?(%02x))", dh6_reconf_type);
  556                 break;
  557             }
  558             break;
  559         case DH6OPT_RECONF_ACCEPT: /* nothing todo */
  560             ND_PRINT(")");
  561             break;
  562         case DH6OPT_SIP_SERVER_A:
  563         case DH6OPT_DNS_SERVERS:
  564         case DH6OPT_SNTP_SERVERS:
  565         case DH6OPT_NIS_SERVERS:
  566         case DH6OPT_NISP_SERVERS:
  567         case DH6OPT_BCMCS_SERVER_A:
  568         case DH6OPT_PANA_AGENT:
  569         case DH6OPT_LQ_CLIENT_LINK:
  570             if (optlen % 16) {
  571                 ND_PRINT(" ?)");
  572                 break;
  573             }
  574             tp = (const u_char *)(dh6o + 1);
  575             for (i = 0; i < optlen; i += 16)
  576                 ND_PRINT(" %s", GET_IP6ADDR_STRING(tp + i));
  577             ND_PRINT(")");
  578             break;
  579         case DH6OPT_SIP_SERVER_D:
  580         case DH6OPT_DOMAIN_LIST:
  581             tp = (const u_char *)(dh6o + 1);
  582             while (tp < cp + sizeof(*dh6o) + optlen) {
  583                 ND_PRINT(" ");
  584                 if ((tp = fqdn_print(ndo, tp, cp + sizeof(*dh6o) + optlen)) == NULL)
  585                     goto trunc;
  586             }
  587             ND_PRINT(")");
  588             break;
  589         case DH6OPT_STATUS_CODE:
  590             if (optlen < 2) {
  591                 ND_PRINT(" ?)");
  592                 break;
  593             }
  594             tp = (const u_char *)(dh6o + 1);
  595             ND_PRINT(" %s)", dhcp6stcode(GET_BE_U_2(tp)));
  596             break;
  597         case DH6OPT_IA_NA:
  598         case DH6OPT_IA_PD:
  599             if (optlen < 12) {
  600                 ND_PRINT(" ?)");
  601                 break;
  602             }
  603             tp = (const u_char *)(dh6o + 1);
  604             ND_PRINT(" IAID:%u T1:%u T2:%u",
  605                 GET_BE_U_4(tp),
  606                 GET_BE_U_4(tp + 4),
  607                 GET_BE_U_4(tp + 8));
  608             if (optlen > 12) {
  609                 /* there are sub-options */
  610                 dhcp6opt_print(ndo, tp + 12, tp + optlen);
  611             }
  612             ND_PRINT(")");
  613             break;
  614         case DH6OPT_IA_TA:
  615             if (optlen < 4) {
  616                 ND_PRINT(" ?)");
  617                 break;
  618             }
  619             tp = (const u_char *)(dh6o + 1);
  620             ND_PRINT(" IAID:%u", GET_BE_U_4(tp));
  621             if (optlen > 4) {
  622                 /* there are sub-options */
  623                 dhcp6opt_print(ndo, tp + 4, tp + optlen);
  624             }
  625             ND_PRINT(")");
  626             break;
  627         case DH6OPT_IA_PD_PREFIX:
  628             if (optlen < 25) {
  629                 ND_PRINT(" ?)");
  630                 break;
  631             }
  632             tp = (const u_char *)(dh6o + 1);
  633             ND_PRINT(" %s/%u", GET_IP6ADDR_STRING(tp + 9),
  634                  GET_U_1(tp + 8));
  635             ND_PRINT(" pltime:%u vltime:%u",
  636                 GET_BE_U_4(tp),
  637                 GET_BE_U_4(tp + 4));
  638             if (optlen > 25) {
  639                 /* there are sub-options */
  640                 dhcp6opt_print(ndo, tp + 25, tp + optlen);
  641             }
  642             ND_PRINT(")");
  643             break;
  644         case DH6OPT_LIFETIME:
  645         case DH6OPT_CLT_TIME:
  646             if (optlen != 4) {
  647                 ND_PRINT(" ?)");
  648                 break;
  649             }
  650             tp = (const u_char *)(dh6o + 1);
  651             ND_PRINT(" %u)", GET_BE_U_4(tp));
  652             break;
  653         case DH6OPT_REMOTE_ID:
  654             if (optlen < 4) {
  655                 ND_PRINT(" ?)");
  656                 break;
  657             }
  658             tp = (const u_char *)(dh6o + 1);
  659             ND_PRINT(" %u ", GET_BE_U_4(tp));
  660             /*
  661              * Print hex dump first 10 characters.
  662              */
  663             for (i = 4; i < optlen && i < 14; i++)
  664                 ND_PRINT("%02x", GET_U_1(tp + i));
  665             ND_PRINT("...)");
  666             break;
  667         case DH6OPT_LQ_QUERY:
  668             if (optlen < 17) {
  669                 ND_PRINT(" ?)");
  670                 break;
  671             }
  672             tp = (const u_char *)(dh6o + 1);
  673             dh6_lq_query_type = GET_U_1(tp);
  674             switch (dh6_lq_query_type) {
  675             case 1:
  676                 ND_PRINT(" by-address");
  677                 break;
  678             case 2:
  679                 ND_PRINT(" by-clientID");
  680                 break;
  681             default:
  682                 ND_PRINT(" type_%u", dh6_lq_query_type);
  683                 break;
  684             }
  685             ND_PRINT(" %s", GET_IP6ADDR_STRING(tp + 1));
  686             if (optlen > 17) {
  687                 /* there are query-options */
  688                 dhcp6opt_print(ndo, tp + 17, tp + optlen);
  689             }
  690             ND_PRINT(")");
  691             break;
  692         case DH6OPT_CLIENT_DATA:
  693             tp = (const u_char *)(dh6o + 1);
  694             if (optlen > 0) {
  695                 /* there are encapsulated options */
  696                 dhcp6opt_print(ndo, tp, tp + optlen);
  697             }
  698             ND_PRINT(")");
  699             break;
  700         case DH6OPT_LQ_RELAY_DATA:
  701             if (optlen < 16) {
  702                 ND_PRINT(" ?)");
  703                 break;
  704             }
  705             tp = (const u_char *)(dh6o + 1);
  706             ND_PRINT(" %s ", GET_IP6ADDR_STRING(tp));
  707             /*
  708              * Print hex dump first 10 characters.
  709              */
  710             for (i = 16; i < optlen && i < 26; i++)
  711                 ND_PRINT("%02x", GET_U_1(tp + i));
  712             ND_PRINT("...)");
  713             break;
  714         case DH6OPT_NTP_SERVER:
  715             if (optlen < 4) {
  716                 ND_PRINT(" ?)");
  717                 break;
  718             }
  719             tp = (const u_char *)(dh6o + 1);
  720             while (tp < cp + sizeof(*dh6o) + optlen - 4) {
  721                 subopt_code = GET_BE_U_2(tp);
  722                 tp += 2;
  723                 subopt_len = GET_BE_U_2(tp);
  724                 tp += 2;
  725                 if (tp + subopt_len > cp + sizeof(*dh6o) + optlen)
  726                     goto trunc;
  727                 ND_PRINT(" subopt:%u", subopt_code);
  728                 switch (subopt_code) {
  729                 case DH6OPT_NTP_SUBOPTION_SRV_ADDR:
  730                 case DH6OPT_NTP_SUBOPTION_MC_ADDR:
  731                     if (subopt_len != 16) {
  732                         ND_PRINT(" ?");
  733                         break;
  734                     }
  735                     ND_PRINT(" %s", GET_IP6ADDR_STRING(tp));
  736                     break;
  737                 case DH6OPT_NTP_SUBOPTION_SRV_FQDN:
  738                     ND_PRINT(" ");
  739                     if (fqdn_print(ndo, tp, tp + subopt_len) == NULL)
  740                         goto trunc;
  741                     break;
  742                 default:
  743                     ND_PRINT(" ?");
  744                     break;
  745                 }
  746                 tp += subopt_len;
  747             }
  748             ND_PRINT(")");
  749             break;
  750         case DH6OPT_AFTR_NAME:
  751             if (optlen < 3) {
  752                 ND_PRINT(" ?)");
  753                 break;
  754             }
  755             tp = (const u_char *)(dh6o + 1);
  756             remain_len = optlen;
  757             ND_PRINT(" ");
  758             /* Encoding is described in section 3.1 of RFC 1035 */
  759             while (remain_len && GET_U_1(tp)) {
  760                 label_len = GET_U_1(tp);
  761                 tp++;
  762                 if (label_len < remain_len - 1) {
  763                     nd_printjnp(ndo, tp, label_len);
  764                     tp += label_len;
  765                     remain_len -= (label_len + 1);
  766                     if(GET_U_1(tp)) ND_PRINT(".");
  767                 } else {
  768                     ND_PRINT(" ?");
  769                     break;
  770                 }
  771             }
  772             ND_PRINT(")");
  773             break;
  774         case DH6OPT_NEW_POSIX_TIMEZONE: /* all three of these options */
  775         case DH6OPT_NEW_TZDB_TIMEZONE:  /* are encoded similarly */
  776         case DH6OPT_MUDURL:     /* although GMT might not work */
  777                 if (optlen < 5) {
  778                 ND_PRINT(" ?)");
  779                 break;
  780             }
  781             tp = (const u_char *)(dh6o + 1);
  782             ND_PRINT(" ");
  783             nd_printjnp(ndo, tp, optlen);
  784             ND_PRINT(")");
  785             break;
  786 
  787         default:
  788             ND_PRINT(")");
  789             break;
  790         }
  791 
  792         cp += sizeof(*dh6o) + optlen;
  793     }
  794     return;
  795 
  796 trunc:
  797     nd_print_trunc(ndo);
  798 }
  799 
  800 /*
  801  * Print dhcp6 packets
  802  */
  803 void
  804 dhcp6_print(netdissect_options *ndo,
  805             const u_char *cp, u_int length)
  806 {
  807     const struct dhcp6 *dh6;
  808     const struct dhcp6_relay *dh6relay;
  809     uint8_t msgtype;
  810     const u_char *ep;
  811     const u_char *extp;
  812     const char *name;
  813 
  814     ndo->ndo_protocol = "dhcp6";
  815     ND_PRINT("dhcp6");
  816 
  817     ep = ndo->ndo_snapend;
  818     if (cp + length < ep)
  819         ep = cp + length;
  820 
  821     dh6 = (const struct dhcp6 *)cp;
  822     dh6relay = (const struct dhcp6_relay *)cp;
  823     ND_TCHECK_4(dh6->dh6_msgtypexid.xid);
  824     msgtype = GET_U_1(dh6->dh6_msgtypexid.msgtype);
  825     name = tok2str(dh6_msgtype_str, "msgtype-%u", msgtype);
  826 
  827     if (!ndo->ndo_vflag) {
  828         ND_PRINT(" %s", name);
  829         return;
  830     }
  831 
  832     /* XXX relay agent messages have to be handled differently */
  833 
  834     ND_PRINT(" %s (", name);    /*)*/
  835     if (msgtype != DH6_RELAY_FORW && msgtype != DH6_RELAY_REPLY) {
  836         ND_PRINT("xid=%x",
  837              GET_BE_U_4(dh6->dh6_msgtypexid.xid) & DH6_XIDMASK);
  838         extp = (const u_char *)(dh6 + 1);
  839         dhcp6opt_print(ndo, extp, ep);
  840     } else {        /* relay messages */
  841         ND_PRINT("linkaddr=%s", GET_IP6ADDR_STRING(dh6relay->dh6relay_linkaddr));
  842 
  843         ND_PRINT(" peeraddr=%s", GET_IP6ADDR_STRING(dh6relay->dh6relay_peeraddr));
  844 
  845         dhcp6opt_print(ndo, (const u_char *)(dh6relay + 1), ep);
  846     }
  847     /*(*/
  848     ND_PRINT(")");
  849     return;
  850 
  851 trunc:
  852     nd_print_trunc(ndo);
  853 }