/* $NetBSD: print-dhcp6.c,v 1.6 2004/09/27 23:04:24 dyoung Exp $ */ /* * 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. */ /* * RFC3315: DHCPv6 * supported DHCPv6 options: * RFC3319, * draft-ietf-dhc-dhcpv6-opt-dnsconfig-04.txt, * draft-ietf-dhc-dhcpv6-opt-prefix-delegation-05.txt * draft-ietf-dhc-dhcpv6-opt-timeconfig-02.txt, */ #include #ifndef lint #if 0 static const char rcsid[] _U_ = "@(#) Header: /tcpdump/master/tcpdump/print-dhcp6.c,v 1.27.2.4 2003/11/18 23:26:14 guy Exp"; #else __RCSID("$NetBSD: print-dhcp6.c,v 1.6 2004/09/27 23:04:24 dyoung Exp $"); #endif #endif #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include "interface.h" #include "addrtoname.h" #include "extract.h" /* lease duration */ #define DHCP6_DURATITION_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 /* DHCP6 base packet format */ struct dhcp6 { union { u_int8_t m; u_int32_t x; } dh6_msgtypexid; /* options follow */ }; #define dh6_msgtype dh6_msgtypexid.m #define dh6_xid dh6_msgtypexid.x #define DH6_XIDMASK 0x00ffffff /* DHCPv6 relay messages */ struct dhcp6_relay { u_int8_t dh6relay_msgtype; u_int8_t dh6relay_hcnt; u_int8_t dh6relay_linkaddr[16]; /* XXX: badly aligned */ u_int8_t dh6relay_peeraddr[16]; /* options follow */ }; /* options */ #define DH6OPT_CLIENTID 1 #define DH6OPT_SERVERID 2 #define DH6OPT_IA_NA 3 #define DH6OPT_IA_TMP 4 #define DH6OPT_IADDR 5 #define DH6OPT_ORO 6 #define DH6OPT_PREFERENCE 7 # define DH6OPT_PREF_UNDEF -1 # 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_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_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 23 #define DH6OPT_DNSNAME 24 /* * The option type has not been assigned for the following options. * We temporarily adopt values used in the service specification document * (200206xx version) by NTT Communications. * Note that we'll change the following definitions if different type values * are officially assigned. */ #define DH6OPT_PREFIX_DELEGATION 30 #define DH6OPT_PREFIX_INFORMATION 31 #define DH6OPT_PREFIX_REQUEST 32 /* * The followings are also unassigned numbers. * We temporarily use values as of KAME snap 20031013. */ #define DH6OPT_IA_PD 33 #define DH6OPT_IA_PD_PREFIX 34 #define DH6OPT_NTP_SERVERS 35 struct dhcp6opt { u_int16_t dh6opt_type; u_int16_t dh6opt_len; /* type-dependent data follows */ }; struct dhcp6_ia { u_int16_t dh6opt_ia_type; u_int16_t dh6opt_ia_len; u_int32_t dh6opt_ia_iaid; u_int32_t dh6opt_ia_t1; u_int32_t dh6opt_ia_t2; }; struct dhcp6_ia_prefix { u_int16_t dh6opt_ia_prefix_type; u_int16_t dh6opt_ia_prefix_len; u_int32_t dh6opt_ia_prefix_pltime; u_int32_t dh6opt_ia_prefix_vltime; u_int8_t dh6opt_ia_prefix_plen; struct in6_addr dh6opt_ia_prefix_addr; } __attribute__ ((__packed__)); static const char * dhcp6opt_name(int type) { static char genstr[sizeof("opt_65535") + 1]; /* XXX thread unsafe */ if (type > 65535) return "INVALID option"; switch(type) { case DH6OPT_CLIENTID: return "client ID"; case DH6OPT_SERVERID: return "server ID"; case DH6OPT_IA_NA: return "IA_NA"; case DH6OPT_ORO: return "option request"; case DH6OPT_PREFERENCE: return "preference"; case DH6OPT_ELAPSED_TIME: return "elapsed time"; case DH6OPT_RELAY_MSG: return "relay message"; case DH6OPT_STATUS_CODE: return "status code"; case DH6OPT_RAPID_COMMIT: return "rapid commit"; case DH6OPT_INTERFACE_ID: return "interface ID"; case DH6OPT_RECONF_MSG: return "reconfigure message"; case DH6OPT_RECONF_ACCEPT: return "reconfigure accept"; case DH6OPT_SIP_SERVER_D: return "SIP Servers Domain"; case DH6OPT_SIP_SERVER_A: return "SIP Servers Address"; case DH6OPT_DNS: return "DNS"; case DH6OPT_PREFIX_DELEGATION: return "prefix delegation"; case DH6OPT_PREFIX_INFORMATION: return "prefix information"; case DH6OPT_IA_PD: return "IA_PD"; case DH6OPT_IA_PD_PREFIX: return "IA_PD prefix"; case DH6OPT_NTP_SERVERS: return "NTP Server"; default: snprintf(genstr, sizeof(genstr), "opt_%d", type); return(genstr); } } static const char * dhcp6stcode(int code) { static char genstr[sizeof("code255") + 1]; /* XXX thread unsafe */ if (code > 255) return "INVALID code"; switch(code) { case DH6OPT_STCODE_SUCCESS: return "success"; case DH6OPT_STCODE_UNSPECFAIL: return "unspec failure"; case DH6OPT_STCODE_NOADDRAVAIL: return "no addresses"; case DH6OPT_STCODE_NOBINDING: return "no binding"; case DH6OPT_STCODE_NOTONLINK: return "not on-link"; case DH6OPT_STCODE_USEMULTICAST: return "use multicast"; case DH6OPT_STCODE_NOPREFIXAVAIL: return "no prefixes"; default: snprintf(genstr, sizeof(genstr), "code%d", code); return(genstr); } } static void dhcp6opt_print(const u_char *cp, const u_char *ep) { struct dhcp6opt *dh6o; u_char *tp; size_t i; u_int16_t opttype; size_t optlen; u_int16_t val16; u_int32_t val32; struct in6_addr addr6; struct dhcp6_ia ia; struct dhcp6_ia_prefix ia_prefix; if (cp == ep) return; while (cp < ep) { if (ep < cp + sizeof(*dh6o)) goto trunc; dh6o = (struct dhcp6opt *)cp; optlen = EXTRACT_16BITS(&dh6o->dh6opt_len); if (ep < cp + sizeof(*dh6o) + optlen) goto trunc; opttype = EXTRACT_16BITS(&dh6o->dh6opt_type); printf(" (%s", dhcp6opt_name(opttype)); switch (opttype) { case DH6OPT_CLIENTID: case DH6OPT_SERVERID: if (optlen < 2) { /*(*/ printf(" ?)"); break; } tp = (u_char *)(dh6o + 1); switch (EXTRACT_16BITS(tp)) { case 1: if (optlen >= 2 + 6) { printf(" hwaddr/time type %u time %u ", EXTRACT_16BITS(&tp[2]), EXTRACT_32BITS(&tp[4])); for (i = 8; i < optlen; i++) printf("%02x", tp[i]); /*(*/ printf(")"); } else { /*(*/ printf(" ?)"); } break; case 2: if (optlen >= 2 + 8) { printf(" vid "); for (i = 2; i < 2 + 8; i++) printf("%02x", tp[i]); /*(*/ printf(")"); } else { /*(*/ printf(" ?)"); } break; case 3: if (optlen >= 2 + 2) { printf(" hwaddr type %u ", EXTRACT_16BITS(&tp[2])); for (i = 4; i < optlen; i++) printf("%02x", tp[i]); /*(*/ printf(")"); } else { /*(*/ printf(" ?)"); } break; default: printf(" type %d)", EXTRACT_16BITS(tp)); break; } break; case DH6OPT_ORO: if (optlen % 2) { printf(" ?)"); break; } tp = (u_char *)(dh6o + 1); for (i = 0; i < optlen; i += 2) { u_int16_t opt; memcpy(&opt, &tp[i], sizeof(opt)); printf(" %s", dhcp6opt_name(ntohs(opt))); } printf(")"); break; case DH6OPT_PREFERENCE: if (optlen != 1) { printf(" ?)"); break; } printf(" %d)", *((u_char *)(dh6o + 1) + 1)); break; case DH6OPT_ELAPSED_TIME: if (optlen != 2) { printf(" ?)"); break; } memcpy(&val16, dh6o + 1, sizeof(val16)); val16 = ntohs(val16); printf(" %d)", (int)val16); break; case DH6OPT_RELAY_MSG: printf(" ("); dhcp6_print((const u_char *)(dh6o + 1), optlen); printf(")"); break; case DH6OPT_RAPID_COMMIT: /* nothing todo */ printf(")"); break; case DH6OPT_INTERFACE_ID: /* * Since we cannot predict the encoding, print hex dump * at most 10 characters. */ for (i = 0; i < optlen && i < 10; i++) printf("%02x", ((u_char *)(dh6o + 1))[i]); break; case DH6OPT_RECONF_MSG: tp = (u_char *)(dh6o + 1); switch (*tp) { case DH6_RENEW: printf(" for renew)"); break; case DH6_INFORM_REQ: printf(" for inf-req)"); break; default: printf(" for ?\?\?(%02x))", *tp); break; } break; case DH6OPT_RECONF_ACCEPT: /* nothing todo */ printf(")"); break; case DH6OPT_SIP_SERVER_A: case DH6OPT_DNS: case DH6OPT_NTP_SERVERS: if (optlen % 16) { printf(" ?)"); break; } tp = (u_char *)(dh6o + 1); for (i = 0; i < optlen; i += 16) printf(" %s", ip6addr_string(&tp[i])); printf(")"); break; case DH6OPT_PREFIX_DELEGATION: dhcp6opt_print((u_char *)(dh6o + 1), (u_char *)(dh6o + 1) + optlen); printf(")"); break; case DH6OPT_PREFIX_INFORMATION: if (optlen % 21) printf(" ?)"); memcpy(&addr6, (u_char *)(dh6o + 1) + 5, sizeof(addr6)); printf(" %s/%d", ip6addr_string(&addr6), (int)*((u_char *)(dh6o + 1) + 4)); memcpy(&val32, dh6o + 1, sizeof(val32)); val32 = ntohl(val32); if (val32 == DHCP6_DURATITION_INFINITE) printf(" lease-duration: infinite)"); else printf(" lease-duration: %u)", val32); break; case DH6OPT_STATUS_CODE: if (optlen < 2) { printf(" ?)"); break; } memcpy(&val16, (u_char *)(dh6o + 1), sizeof(val16)); val16 = ntohs(val16); printf(" %s)", dhcp6stcode(val16)); break; case DH6OPT_IA_NA: case DH6OPT_IA_PD: if (optlen < sizeof(ia) - 4) { printf(" ?)"); break; } memcpy(&ia, (u_char *)dh6o, sizeof(ia)); ia.dh6opt_ia_iaid = ntohl(ia.dh6opt_ia_iaid); ia.dh6opt_ia_t1 = ntohl(ia.dh6opt_ia_t1); ia.dh6opt_ia_t2 = ntohl(ia.dh6opt_ia_t2); printf(" IAID:%lu T1:%lu T2:%lu", (unsigned long)ia.dh6opt_ia_iaid, (unsigned long)ia.dh6opt_ia_t1, (unsigned long)ia.dh6opt_ia_t2); if (optlen > sizeof(ia) - 4) { /* there are sub-options */ dhcp6opt_print((u_char *)dh6o + sizeof(ia), (u_char *)(dh6o + 1) + optlen); } printf(")"); break; case DH6OPT_IA_PD_PREFIX: if (optlen < sizeof(ia_prefix) - 4) { printf(" ?)"); break; } memcpy(&ia_prefix, (u_char *)dh6o, sizeof(ia_prefix)); printf(" %s/%d", ip6addr_string(&ia_prefix.dh6opt_ia_prefix_addr), ia_prefix.dh6opt_ia_prefix_plen); ia_prefix.dh6opt_ia_prefix_pltime = ntohl(ia_prefix.dh6opt_ia_prefix_pltime); ia_prefix.dh6opt_ia_prefix_vltime = ntohl(ia_prefix.dh6opt_ia_prefix_vltime); printf(" pltime:%lu vltime:%lu", (unsigned long)ia_prefix.dh6opt_ia_prefix_pltime, (unsigned long)ia_prefix.dh6opt_ia_prefix_vltime); if (optlen > sizeof(ia_prefix) - 4) { /* there are sub-options */ dhcp6opt_print((u_char *)dh6o + sizeof(ia_prefix), (u_char *)(dh6o + 1) + optlen); } printf(")"); break; default: printf(")"); break; } cp += sizeof(*dh6o) + optlen; } return; trunc: printf("[|dhcp6ext]"); } /* * Print dhcp6 packets */ void dhcp6_print(const u_char *cp, u_int length) { struct dhcp6 *dh6; struct dhcp6_relay *dh6relay; const u_char *ep; u_char *extp; const char *name; printf("dhcp6"); ep = (u_char *)snapend; if (cp + length < ep) ep = cp + length; dh6 = (struct dhcp6 *)cp; dh6relay = (struct dhcp6_relay *)cp; TCHECK(dh6->dh6_xid); switch (dh6->dh6_msgtype) { case DH6_SOLICIT: name = "solicit"; break; case DH6_ADVERTISE: name = "advertise"; break; case DH6_REQUEST: name = "request"; break; case DH6_CONFIRM: name = "confirm"; break; case DH6_RENEW: name = "renew"; break; case DH6_REBIND: name = "rebind"; break; case DH6_REPLY: name = "reply"; break; case DH6_RELEASE: name = "release"; break; case DH6_DECLINE: name = "decline"; break; case DH6_RECONFIGURE: name = "reconfigure"; break; case DH6_INFORM_REQ: name= "inf-req"; break; case DH6_RELAY_FORW: name= "relay-fwd"; break; case DH6_RELAY_REPLY: name= "relay-reply"; break; default: name = NULL; break; } if (!vflag) { if (name) printf(" %s", name); else if (dh6->dh6_msgtype != DH6_RELAY_FORW && dh6->dh6_msgtype != DH6_RELAY_REPLY) { printf(" msgtype-%u", dh6->dh6_msgtype); } return; } /* XXX relay agent messages have to be handled differently */ if (name) printf(" %s (", name); /*)*/ else printf(" msgtype-%u (", dh6->dh6_msgtype); /*)*/ if (dh6->dh6_msgtype != DH6_RELAY_FORW && dh6->dh6_msgtype != DH6_RELAY_REPLY) { printf("xid=%x", EXTRACT_32BITS(&dh6->dh6_xid) & DH6_XIDMASK); extp = (u_char *)(dh6 + 1); dhcp6opt_print(extp, ep); } else { /* relay messages */ struct in6_addr addr6; TCHECK(dh6relay->dh6relay_peeraddr); memcpy(&addr6, dh6relay->dh6relay_linkaddr, sizeof (addr6)); printf("linkaddr=%s", ip6addr_string(&addr6)); memcpy(&addr6, dh6relay->dh6relay_peeraddr, sizeof (addr6)); printf(" peeraddr=%s", ip6addr_string(&addr6)); dhcp6opt_print((u_char *)(dh6relay + 1), ep); } /*(*/ printf(")"); return; trunc: printf("[|dhcp6]"); }