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tcpdump/print-icmp6.c
Guy Harris e8b5237589 Don't directly fetch multi-byte integers from packets. 
Use the EXTRACT_ macros to extract multi-byte integral values from
packets, rather than just dereferencing pointers into the packet; there
is no guarantee that the packet data will be aligned on the right
boundary, and there is no guarantee that, if they're not, a direct
access will work correctly.
2010-02-21 00:27:00 -08:00

1388 lines
36 KiB
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/*
* Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
static const char rcsid[] _U_ =
"@(#) $Header: /tcpdump/master/tcpdump/print-icmp6.c,v 1.86 2008-02-05 19:36:13 guy Exp $";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef INET6
#include <tcpdump-stdinc.h>
#include <stdio.h>
#include <string.h>
#include "interface.h"
#include "addrtoname.h"
#include "extract.h"
#include "ip6.h"
#include "icmp6.h"
#include "ipproto.h"
#include "udp.h"
#include "ah.h"
static const char *get_rtpref(u_int);
static const char *get_lifetime(u_int32_t);
static void print_lladdr(const u_char *, size_t);
static void icmp6_opt_print(const u_char *, int);
static void mld6_print(const u_char *);
static void mldv2_report_print(const u_char *, u_int);
static void mldv2_query_print(const u_char *, u_int);
static struct udphdr *get_upperlayer(u_char *, u_int *);
static void dnsname_print(const u_char *, const u_char *);
static void icmp6_nodeinfo_print(u_int, const u_char *, const u_char *);
static void icmp6_rrenum_print(const u_char *, const u_char *);
#ifndef abs
#define abs(a) ((0 < (a)) ? (a) : -(a))
#endif
/* inline the various RPL definitions */
#define ND_RPL_MESSAGE 0x9B
static struct tok icmp6_type_values[] = {
{ ICMP6_DST_UNREACH, "destination unreachable"},
{ ICMP6_PACKET_TOO_BIG, "packet too big"},
{ ICMP6_TIME_EXCEEDED, "time exceeded in-transit"},
{ ICMP6_PARAM_PROB, "parameter problem"},
{ ICMP6_ECHO_REQUEST, "echo request"},
{ ICMP6_ECHO_REPLY, "echo reply"},
{ MLD6_LISTENER_QUERY, "multicast listener query"},
{ MLD6_LISTENER_REPORT, "multicast listener report"},
{ MLD6_LISTENER_DONE, "multicast listener done"},
{ ND_ROUTER_SOLICIT, "router solicitation"},
{ ND_ROUTER_ADVERT, "router advertisement"},
{ ND_NEIGHBOR_SOLICIT, "neighbor solicitation"},
{ ND_NEIGHBOR_ADVERT, "neighbor advertisement"},
{ ND_REDIRECT, "redirect"},
{ ICMP6_ROUTER_RENUMBERING, "router renumbering"},
{ IND_SOLICIT, "inverse neighbor solicitation"},
{ IND_ADVERT, "inverse neighbor advertisement"},
{ MLDV2_LISTENER_REPORT, "multicast listener report v2"},
{ ICMP6_HADISCOV_REQUEST, "ha discovery request"},
{ ICMP6_HADISCOV_REPLY, "ha discovery reply"},
{ ICMP6_MOBILEPREFIX_SOLICIT, "mobile router solicitation"},
{ ICMP6_MOBILEPREFIX_ADVERT, "mobile router advertisement"},
{ ICMP6_WRUREQUEST, "who-are-you request"},
{ ICMP6_WRUREPLY, "who-are-you reply"},
{ ICMP6_NI_QUERY, "node information query"},
{ ICMP6_NI_REPLY, "node information reply"},
{ MLD6_MTRACE, "mtrace message"},
{ MLD6_MTRACE_RESP, "mtrace response"},
{ ND_RPL_MESSAGE, "RPL"},
{ 0, NULL }
};
static struct tok icmp6_dst_unreach_code_values[] = {
{ ICMP6_DST_UNREACH_NOROUTE, "unreachable route" },
{ ICMP6_DST_UNREACH_ADMIN, " unreachable prohibited"},
{ ICMP6_DST_UNREACH_BEYONDSCOPE, "beyond scope"},
{ ICMP6_DST_UNREACH_ADDR, "unreachable address"},
{ ICMP6_DST_UNREACH_NOPORT, "unreachable port"},
{ 0, NULL }
};
static struct tok icmp6_opt_pi_flag_values[] = {
{ ND_OPT_PI_FLAG_ONLINK, "onlink" },
{ ND_OPT_PI_FLAG_AUTO, "auto" },
{ ND_OPT_PI_FLAG_ROUTER, "router" },
{ 0, NULL }
};
static struct tok icmp6_opt_ra_flag_values[] = {
{ ND_RA_FLAG_MANAGED, "managed" },
{ ND_RA_FLAG_OTHER, "other stateful"},
{ ND_RA_FLAG_HOME_AGENT, "home agent"},
{ 0, NULL }
};
static struct tok icmp6_nd_na_flag_values[] = {
{ ND_NA_FLAG_ROUTER, "router" },
{ ND_NA_FLAG_SOLICITED, "solicited" },
{ ND_NA_FLAG_OVERRIDE, "override" },
{ 0, NULL }
};
static struct tok icmp6_opt_values[] = {
{ ND_OPT_SOURCE_LINKADDR, "source link-address"},
{ ND_OPT_TARGET_LINKADDR, "destination link-address"},
{ ND_OPT_PREFIX_INFORMATION, "prefix info"},
{ ND_OPT_REDIRECTED_HEADER, "redirected header"},
{ ND_OPT_MTU, "mtu"},
{ ND_OPT_RDNSS, "rdnss"},
{ ND_OPT_ADVINTERVAL, "advertisement interval"},
{ ND_OPT_HOMEAGENT_INFO, "homeagent information"},
{ ND_OPT_ROUTE_INFO, "route info"},
{ 0, NULL }
};
/* mldv2 report types */
static struct tok mldv2report2str[] = {
{ 1, "is_in" },
{ 2, "is_ex" },
{ 3, "to_in" },
{ 4, "to_ex" },
{ 5, "allow" },
{ 6, "block" },
{ 0, NULL }
};
static const char *
get_rtpref(u_int v)
{
static const char *rtpref_str[] = {
"medium", /* 00 */
"high", /* 01 */
"rsv", /* 10 */
"low" /* 11 */
};
return rtpref_str[((v & ND_RA_FLAG_RTPREF_MASK) >> 3) & 0xff];
}
static const char *
get_lifetime(u_int32_t v)
{
static char buf[20];
if (v == (u_int32_t)~0UL)
return "infinity";
else {
snprintf(buf, sizeof(buf), "%u", v);
return buf;
}
}
static void
print_lladdr(const u_int8_t *p, size_t l)
{
const u_int8_t *ep, *q;
q = p;
ep = p + l;
while (l > 0 && q < ep) {
if (q > p)
printf(":");
printf("%02x", *q++);
l--;
}
}
static int icmp6_cksum(const struct ip6_hdr *ip6, const struct icmp6_hdr *icp,
u_int len)
{
size_t i;
register const u_int16_t *sp;
u_int32_t sum;
union {
struct {
struct in6_addr ph_src;
struct in6_addr ph_dst;
u_int32_t ph_len;
u_int8_t ph_zero[3];
u_int8_t ph_nxt;
} ph;
u_int16_t pa[20];
} phu;
/* pseudo-header */
memset(&phu, 0, sizeof(phu));
phu.ph.ph_src = ip6->ip6_src;
phu.ph.ph_dst = ip6->ip6_dst;
phu.ph.ph_len = htonl(len);
phu.ph.ph_nxt = IPPROTO_ICMPV6;
sum = 0;
for (i = 0; i < sizeof(phu.pa) / sizeof(phu.pa[0]); i++)
sum += phu.pa[i];
sp = (const u_int16_t *)icp;
for (i = 0; i < (len & ~1); i += 2)
sum += *sp++;
if (len & 1)
sum += htons((*(const u_int8_t *)sp) << 8);
while (sum > 0xffff)
sum = (sum & 0xffff) + (sum >> 16);
sum = ~sum & 0xffff;
return (sum);
}
enum ND_RPL_CODE {
ND_RPL_DAG_IS=0x01,
ND_RPL_DAG_IO=0x02,
ND_RPL_DAO =0x04
};
enum ND_RPL_DIO_FLAGS {
ND_RPL_DIO_GROUNDED = 0x80,
ND_RPL_DIO_DATRIG = 0x40,
ND_RPL_DIO_DASUPPORT= 0x20,
ND_RPL_DIO_RES4 = 0x10,
ND_RPL_DIO_RES3 = 0x08,
ND_RPL_DIO_PRF_MASK = 0x07, /* 3-bit preference */
};
struct nd_rpl_dio {
u_int8_t rpl_flags;
u_int8_t rpl_seq;
u_int8_t rpl_instanceid;
u_int8_t rpl_dagrank;
u_int8_t rpl_dagid[16];
};
static void
rpl_print(netdissect_options *ndo,
const struct icmp6_hdr *hdr,
const u_char *bp, u_int length _U_)
{
struct nd_rpl_dio *dio = (struct nd_rpl_dio *)bp;
ND_TCHECK(dio->rpl_dagid);
switch(hdr->icmp6_code) {
case ND_RPL_DAG_IS:
ND_PRINT((ndo, ", DAG Information Solicitation"));
if(ndo->ndo_vflag) {
}
break;
case ND_RPL_DAG_IO:
ND_PRINT((ndo, ", DAG Information Object"));
if(ndo->ndo_vflag) {
char dagid[65];
char *d = dagid;
int i;
for(i=0;i<16;i++) {
if(isprint(dio->rpl_dagid[i])) {
*d++ = dio->rpl_dagid[i];
} else {
int cnt=snprintf(d,4,"0x%02x",
dio->rpl_dagid[i]);
d += cnt;
}
}
*d++ = '\0';
ND_PRINT((ndo, " [seq:%u,instance:%u,rank:%u,dagid:%s]",
dio->rpl_seq,
dio->rpl_instanceid,
dio->rpl_dagrank,
dagid));
}
break;
case ND_RPL_DAO:
ND_PRINT((ndo, ", Destination Advertisement Object"));
if(ndo->ndo_vflag) {
}
break;
default:
ND_PRINT((ndo, ", RPL message, unknown code %u",hdr->icmp6_code));
break;
}
return;
trunc:
ND_PRINT((ndo," [|truncated]"));
return;
}
void
icmp6_print(netdissect_options *ndo,
const u_char *bp, u_int length, const u_char *bp2, int fragmented)
{
const struct icmp6_hdr *dp;
const struct ip6_hdr *ip;
const struct ip6_hdr *oip;
const struct udphdr *ouh;
int dport;
const u_char *ep;
u_int prot;
dp = (struct icmp6_hdr *)bp;
ip = (struct ip6_hdr *)bp2;
oip = (struct ip6_hdr *)(dp + 1);
/* 'ep' points to the end of available data. */
ep = snapend;
TCHECK(dp->icmp6_cksum);
if (vflag && !fragmented) {
int sum = dp->icmp6_cksum;
if (TTEST2(bp[0], length)) {
sum = icmp6_cksum(ip, dp, length);
if (sum != 0)
(void)printf("[bad icmp6 cksum %x!] ", sum);
else
(void)printf("[icmp6 sum ok] ");
}
}
printf("ICMP6, %s", tok2str(icmp6_type_values,"unknown icmp6 type (%u)",dp->icmp6_type));
/* display cosmetics: print the packet length for printer that use the vflag now */
if (vflag && (dp->icmp6_type ==
ND_ROUTER_SOLICIT ||
ND_ROUTER_ADVERT ||
ND_NEIGHBOR_ADVERT ||
ND_NEIGHBOR_SOLICIT ||
ND_REDIRECT ||
ICMP6_HADISCOV_REPLY ||
ICMP6_MOBILEPREFIX_ADVERT ))
printf(", length %u", length);
switch (dp->icmp6_type) {
case ICMP6_DST_UNREACH:
TCHECK(oip->ip6_dst);
printf(", %s", tok2str(icmp6_dst_unreach_code_values,"unknown unreach code (%u)",dp->icmp6_code));
switch (dp->icmp6_code) {
case ICMP6_DST_UNREACH_NOROUTE: /* fall through */
case ICMP6_DST_UNREACH_ADMIN:
case ICMP6_DST_UNREACH_ADDR:
printf(" %s",ip6addr_string(&oip->ip6_dst));
break;
case ICMP6_DST_UNREACH_BEYONDSCOPE:
printf(" %s, source address %s",
ip6addr_string(&oip->ip6_dst),
ip6addr_string(&oip->ip6_src));
break;
case ICMP6_DST_UNREACH_NOPORT:
if ((ouh = get_upperlayer((u_char *)oip, &prot))
== NULL)
goto trunc;
dport = EXTRACT_16BITS(&ouh->uh_dport);
switch (prot) {
case IPPROTO_TCP:
printf(", %s tcp port %s",
ip6addr_string(&oip->ip6_dst),
tcpport_string(dport));
break;
case IPPROTO_UDP:
printf(", %s udp port %s",
ip6addr_string(&oip->ip6_dst),
udpport_string(dport));
break;
default:
printf(", %s protocol %d port %d unreachable",
ip6addr_string(&oip->ip6_dst),
oip->ip6_nxt, dport);
break;
}
break;
default:
if (vflag <= 1) {
print_unknown_data(bp,"\n\t",length);
return;
}
break;
}
break;
case ICMP6_PACKET_TOO_BIG:
TCHECK(dp->icmp6_mtu);
printf(", mtu %u", EXTRACT_32BITS(&dp->icmp6_mtu));
break;
case ICMP6_TIME_EXCEEDED:
TCHECK(oip->ip6_dst);
switch (dp->icmp6_code) {
case ICMP6_TIME_EXCEED_TRANSIT:
printf(" for %s",
ip6addr_string(&oip->ip6_dst));
break;
case ICMP6_TIME_EXCEED_REASSEMBLY:
printf(" (reassembly)");
break;
default:
printf(", unknown code (%u)", dp->icmp6_code);
break;
}
break;
case ICMP6_PARAM_PROB:
TCHECK(oip->ip6_dst);
switch (dp->icmp6_code) {
case ICMP6_PARAMPROB_HEADER:
printf(", errorneous - octet %u", EXTRACT_32BITS(&dp->icmp6_pptr));
break;
case ICMP6_PARAMPROB_NEXTHEADER:
printf(", next header - octet %u", EXTRACT_32BITS(&dp->icmp6_pptr));
break;
case ICMP6_PARAMPROB_OPTION:
printf(", option - octet %u", EXTRACT_32BITS(&dp->icmp6_pptr));
break;
default:
printf(", code-#%d",
dp->icmp6_code);
break;
}
break;
case ICMP6_ECHO_REQUEST:
case ICMP6_ECHO_REPLY:
TCHECK(dp->icmp6_seq);
printf(", seq %u", EXTRACT_16BITS(&dp->icmp6_seq));
break;
case ICMP6_MEMBERSHIP_QUERY:
if (length == MLD_MINLEN) {
mld6_print((const u_char *)dp);
} else if (length >= MLDV2_MINLEN) {
printf("v2 ");
mldv2_query_print((const u_char *)dp, length);
} else {
printf(" unknown-version (len %u) ", length);
}
break;
case ICMP6_MEMBERSHIP_REPORT:
mld6_print((const u_char *)dp);
break;
case ICMP6_MEMBERSHIP_REDUCTION:
mld6_print((const u_char *)dp);
break;
case ND_ROUTER_SOLICIT:
#define RTSOLLEN 8
if (vflag) {
icmp6_opt_print((const u_char *)dp + RTSOLLEN,
length - RTSOLLEN);
}
break;
case ND_ROUTER_ADVERT:
#define RTADVLEN 16
if (vflag) {
struct nd_router_advert *p;
p = (struct nd_router_advert *)dp;
TCHECK(p->nd_ra_retransmit);
printf("\n\thop limit %u, Flags [%s]" \
", pref %s, router lifetime %us, reachable time %us, retrans time %us",
(u_int)p->nd_ra_curhoplimit,
bittok2str(icmp6_opt_ra_flag_values,"none",(p->nd_ra_flags_reserved)),
get_rtpref(p->nd_ra_flags_reserved),
EXTRACT_16BITS(&p->nd_ra_router_lifetime),
EXTRACT_32BITS(&p->nd_ra_reachable),
EXTRACT_32BITS(&p->nd_ra_retransmit));
icmp6_opt_print((const u_char *)dp + RTADVLEN,
length - RTADVLEN);
}
break;
case ND_NEIGHBOR_SOLICIT:
{
struct nd_neighbor_solicit *p;
p = (struct nd_neighbor_solicit *)dp;
TCHECK(p->nd_ns_target);
printf(", who has %s", ip6addr_string(&p->nd_ns_target));
if (vflag) {
#define NDSOLLEN 24
icmp6_opt_print((const u_char *)dp + NDSOLLEN,
length - NDSOLLEN);
}
}
break;
case ND_NEIGHBOR_ADVERT:
{
struct nd_neighbor_advert *p;
p = (struct nd_neighbor_advert *)dp;
TCHECK(p->nd_na_target);
printf(", tgt is %s",
ip6addr_string(&p->nd_na_target));
if (vflag) {
printf(", Flags [%s]",
bittok2str(icmp6_nd_na_flag_values,
"none",
EXTRACT_32BITS(&p->nd_na_flags_reserved)));
#define NDADVLEN 24
icmp6_opt_print((const u_char *)dp + NDADVLEN,
length - NDADVLEN);
#undef NDADVLEN
}
}
break;
case ND_REDIRECT:
#define RDR(i) ((struct nd_redirect *)(i))
TCHECK(RDR(dp)->nd_rd_dst);
printf(", %s", getname6((const u_char *)&RDR(dp)->nd_rd_dst));
TCHECK(RDR(dp)->nd_rd_target);
printf(" to %s",
getname6((const u_char*)&RDR(dp)->nd_rd_target));
#define REDIRECTLEN 40
if (vflag) {
icmp6_opt_print((const u_char *)dp + REDIRECTLEN,
length - REDIRECTLEN);
}
break;
#undef REDIRECTLEN
#undef RDR
case ICMP6_ROUTER_RENUMBERING:
icmp6_rrenum_print(bp, ep);
break;
case ICMP6_NI_QUERY:
case ICMP6_NI_REPLY:
icmp6_nodeinfo_print(length, bp, ep);
break;
case IND_SOLICIT:
case IND_ADVERT:
break;
case ICMP6_V2_MEMBERSHIP_REPORT:
mldv2_report_print((const u_char *) dp, length);
break;
case ICMP6_MOBILEPREFIX_SOLICIT: /* fall through */
case ICMP6_HADISCOV_REQUEST:
TCHECK(dp->icmp6_data16[0]);
printf(", id 0x%04x", EXTRACT_16BITS(&dp->icmp6_data16[0]));
break;
case ICMP6_HADISCOV_REPLY:
if (vflag) {
struct in6_addr *in6;
u_char *cp;
TCHECK(dp->icmp6_data16[0]);
printf(", id 0x%04x", EXTRACT_16BITS(&dp->icmp6_data16[0]));
cp = (u_char *)dp + length;
in6 = (struct in6_addr *)(dp + 1);
for (; (u_char *)in6 < cp; in6++) {
TCHECK(*in6);
printf(", %s", ip6addr_string(in6));
}
}
break;
case ICMP6_MOBILEPREFIX_ADVERT:
if (vflag) {
TCHECK(dp->icmp6_data16[0]);
printf(", id 0x%04x", EXTRACT_16BITS(&dp->icmp6_data16[0]));
if (dp->icmp6_data16[1] & 0xc0)
printf(" ");
if (dp->icmp6_data16[1] & 0x80)
printf("M");
if (dp->icmp6_data16[1] & 0x40)
printf("O");
#define MPADVLEN 8
icmp6_opt_print((const u_char *)dp + MPADVLEN,
length - MPADVLEN);
}
break;
case ND_RPL_MESSAGE:
rpl_print(ndo, dp, &dp->icmp6_data8[0], length);
break;
default:
printf(", length %u", length);
if (vflag <= 1)
print_unknown_data(bp,"\n\t", length);
return;
}
if (!vflag)
printf(", length %u", length);
return;
trunc:
fputs("[|icmp6]", stdout);
}
static struct udphdr *
get_upperlayer(u_char *bp, u_int *prot)
{
const u_char *ep;
struct ip6_hdr *ip6 = (struct ip6_hdr *)bp;
struct udphdr *uh;
struct ip6_hbh *hbh;
struct ip6_frag *fragh;
struct ah *ah;
u_int nh;
int hlen;
/* 'ep' points to the end of available data. */
ep = snapend;
if (!TTEST(ip6->ip6_nxt))
return NULL;
nh = ip6->ip6_nxt;
hlen = sizeof(struct ip6_hdr);
while (bp < ep) {
bp += hlen;
switch(nh) {
case IPPROTO_UDP:
case IPPROTO_TCP:
uh = (struct udphdr *)bp;
if (TTEST(uh->uh_dport)) {
*prot = nh;
return(uh);
}
else
return(NULL);
/* NOTREACHED */
case IPPROTO_HOPOPTS:
case IPPROTO_DSTOPTS:
case IPPROTO_ROUTING:
hbh = (struct ip6_hbh *)bp;
if (!TTEST(hbh->ip6h_len))
return(NULL);
nh = hbh->ip6h_nxt;
hlen = (hbh->ip6h_len + 1) << 3;
break;
case IPPROTO_FRAGMENT: /* this should be odd, but try anyway */
fragh = (struct ip6_frag *)bp;
if (!TTEST(fragh->ip6f_offlg))
return(NULL);
/* fragments with non-zero offset are meaningless */
if ((EXTRACT_16BITS(&fragh->ip6f_offlg) & IP6F_OFF_MASK) != 0)
return(NULL);
nh = fragh->ip6f_nxt;
hlen = sizeof(struct ip6_frag);
break;
case IPPROTO_AH:
ah = (struct ah *)bp;
if (!TTEST(ah->ah_len))
return(NULL);
nh = ah->ah_nxt;
hlen = (ah->ah_len + 2) << 2;
break;
default: /* unknown or undecodable header */
*prot = nh; /* meaningless, but set here anyway */
return(NULL);
}
}
return(NULL); /* should be notreached, though */
}
static void
icmp6_opt_print(const u_char *bp, int resid)
{
const struct nd_opt_hdr *op;
const struct nd_opt_hdr *opl; /* why there's no struct? */
const struct nd_opt_prefix_info *opp;
const struct icmp6_opts_redirect *opr;
const struct nd_opt_mtu *opm;
const struct nd_opt_rdnss *oprd;
const struct nd_opt_advinterval *opa;
const struct nd_opt_homeagent_info *oph;
const struct nd_opt_route_info *opri;
const u_char *cp, *ep;
struct in6_addr in6, *in6p;
size_t l;
u_int i;
#define ECHECK(var) if ((u_char *)&(var) > ep - sizeof(var)) return
cp = bp;
/* 'ep' points to the end of available data. */
ep = snapend;
while (cp < ep) {
op = (struct nd_opt_hdr *)cp;
ECHECK(op->nd_opt_len);
if (resid <= 0)
return;
if (op->nd_opt_len == 0)
goto trunc;
if (cp + (op->nd_opt_len << 3) > ep)
goto trunc;
printf("\n\t %s option (%u), length %u (%u): ",
tok2str(icmp6_opt_values, "unknown", op->nd_opt_type),
op->nd_opt_type,
op->nd_opt_len << 3,
op->nd_opt_len);
switch (op->nd_opt_type) {
case ND_OPT_SOURCE_LINKADDR:
opl = (struct nd_opt_hdr *)op;
l = (op->nd_opt_len << 3) - 2;
print_lladdr(cp + 2, l);
break;
case ND_OPT_TARGET_LINKADDR:
opl = (struct nd_opt_hdr *)op;
l = (op->nd_opt_len << 3) - 2;
print_lladdr(cp + 2, l);
break;
case ND_OPT_PREFIX_INFORMATION:
opp = (struct nd_opt_prefix_info *)op;
TCHECK(opp->nd_opt_pi_prefix);
printf("%s/%u%s, Flags [%s], valid time %ss",
ip6addr_string(&opp->nd_opt_pi_prefix),
opp->nd_opt_pi_prefix_len,
(op->nd_opt_len != 4) ? "badlen" : "",
bittok2str(icmp6_opt_pi_flag_values, "none", opp->nd_opt_pi_flags_reserved),
get_lifetime(EXTRACT_32BITS(&opp->nd_opt_pi_valid_time)));
printf(", pref. time %ss", get_lifetime(EXTRACT_32BITS(&opp->nd_opt_pi_preferred_time)));
break;
case ND_OPT_REDIRECTED_HEADER:
opr = (struct icmp6_opts_redirect *)op;
print_unknown_data(bp,"\n\t ",op->nd_opt_len<<3);
/* xxx */
break;
case ND_OPT_MTU:
opm = (struct nd_opt_mtu *)op;
TCHECK(opm->nd_opt_mtu_mtu);
printf(" %u%s",
EXTRACT_32BITS(&opm->nd_opt_mtu_mtu),
(op->nd_opt_len != 1) ? "bad option length" : "" );
break;
case ND_OPT_RDNSS:
oprd = (struct nd_opt_rdnss *)op;
l = (op->nd_opt_len - 1) / 2;
printf(" lifetime %us,",
EXTRACT_32BITS(&oprd->nd_opt_rdnss_lifetime));
for (i = 0; i < l; i++) {
TCHECK(oprd->nd_opt_rdnss_addr[i]);
printf(" addr: %s",
ip6addr_string(&oprd->nd_opt_rdnss_addr[i]));
}
break;
case ND_OPT_ADVINTERVAL:
opa = (struct nd_opt_advinterval *)op;
TCHECK(opa->nd_opt_adv_interval);
printf(" %us", EXTRACT_32BITS(&opa->nd_opt_adv_interval));
break;
case ND_OPT_HOMEAGENT_INFO:
oph = (struct nd_opt_homeagent_info *)op;
TCHECK(oph->nd_opt_hai_lifetime);
printf(" preference %u, lifetime %u",
EXTRACT_16BITS(&oph->nd_opt_hai_preference),
EXTRACT_16BITS(&oph->nd_opt_hai_lifetime));
break;
case ND_OPT_ROUTE_INFO:
opri = (struct nd_opt_route_info *)op;
TCHECK(opri->nd_opt_rti_lifetime);
memset(&in6, 0, sizeof(in6));
in6p = (struct in6_addr *)(opri + 1);
switch (op->nd_opt_len) {
case 1:
break;
case 2:
TCHECK2(*in6p, 8);
memcpy(&in6, opri + 1, 8);
break;
case 3:
TCHECK(*in6p);
memcpy(&in6, opri + 1, sizeof(in6));
break;
default:
goto trunc;
}
printf(" %s/%u", ip6addr_string(&in6),
opri->nd_opt_rti_prefixlen);
printf(", pref=%s", get_rtpref(opri->nd_opt_rti_flags));
printf(", lifetime=%s",
get_lifetime(EXTRACT_32BITS(&opri->nd_opt_rti_lifetime)));
break;
default:
if (vflag <= 1) {
print_unknown_data(cp+2,"\n\t ", (op->nd_opt_len << 3) - 2); /* skip option header */
return;
}
break;
}
/* do we want to see an additional hexdump ? */
if (vflag> 1)
print_unknown_data(cp+2,"\n\t ", (op->nd_opt_len << 3) - 2); /* skip option header */
cp += op->nd_opt_len << 3;
resid -= op->nd_opt_len << 3;
}
return;
trunc:
fputs("[ndp opt]", stdout);
return;
#undef ECHECK
}
static void
mld6_print(const u_char *bp)
{
struct mld6_hdr *mp = (struct mld6_hdr *)bp;
const u_char *ep;
/* 'ep' points to the end of available data. */
ep = snapend;
if ((u_char *)mp + sizeof(*mp) > ep)
return;
printf("max resp delay: %d ", EXTRACT_16BITS(&mp->mld6_maxdelay));
printf("addr: %s", ip6addr_string(&mp->mld6_addr));
}
static void
mldv2_report_print(const u_char *bp, u_int len)
{
struct icmp6_hdr *icp = (struct icmp6_hdr *) bp;
u_int group, nsrcs, ngroups;
u_int i, j;
/* Minimum len is 8 */
if (len < 8) {
printf(" [invalid len %d]", len);
return;
}
TCHECK(icp->icmp6_data16[1]);
ngroups = EXTRACT_16BITS(&icp->icmp6_data16[1]);
printf(", %d group record(s)", ngroups);
if (vflag > 0) {
/* Print the group records */
group = 8;
for (i = 0; i < ngroups; i++) {
/* type(1) + auxlen(1) + numsrc(2) + grp(16) */
if (len < group + 20) {
printf(" [invalid number of groups]");
return;
}
TCHECK2(bp[group + 4], sizeof(struct in6_addr));
printf(" [gaddr %s", ip6addr_string(&bp[group + 4]));
printf(" %s", tok2str(mldv2report2str, " [v2-report-#%d]",
bp[group]));
nsrcs = (bp[group + 2] << 8) + bp[group + 3];
/* Check the number of sources and print them */
if (len < group + 20 + (nsrcs * sizeof(struct in6_addr))) {
printf(" [invalid number of sources %d]", nsrcs);
return;
}
if (vflag == 1)
printf(", %d source(s)", nsrcs);
else {
/* Print the sources */
(void)printf(" {");
for (j = 0; j < nsrcs; j++) {
TCHECK2(bp[group + 20 + j * sizeof(struct in6_addr)],
sizeof(struct in6_addr));
printf(" %s", ip6addr_string(&bp[group + 20 + j * sizeof(struct in6_addr)]));
}
(void)printf(" }");
}
/* Next group record */
group += 20 + nsrcs * sizeof(struct in6_addr);
printf("]");
}
}
return;
trunc:
(void)printf("[|icmp6]");
return;
}
static void
mldv2_query_print(const u_char *bp, u_int len)
{
struct icmp6_hdr *icp = (struct icmp6_hdr *) bp;
u_int mrc;
int mrt, qqi;
u_int nsrcs;
register u_int i;
/* Minimum len is 28 */
if (len < 28) {
printf(" [invalid len %d]", len);
return;
}
TCHECK(icp->icmp6_data16[0]);
mrc = EXTRACT_16BITS(&icp->icmp6_data16[0]);
if (mrc < 32768) {
mrt = mrc;
} else {
mrt = ((mrc & 0x0fff) | 0x1000) << (((mrc & 0x7000) >> 12) + 3);
}
if (vflag) {
(void)printf(" [max resp delay=%d]", mrt);
}
TCHECK2(bp[8], sizeof(struct in6_addr));
printf(" [gaddr %s", ip6addr_string(&bp[8]));
if (vflag) {
TCHECK(bp[25]);
if (bp[24] & 0x08) {
printf(" sflag");
}
if (bp[24] & 0x07) {
printf(" robustness=%d", bp[24] & 0x07);
}
if (bp[25] < 128) {
qqi = bp[25];
} else {
qqi = ((bp[25] & 0x0f) | 0x10) << (((bp[25] & 0x70) >> 4) + 3);
}
printf(" qqi=%d", qqi);
}
TCHECK2(bp[26], 2);
nsrcs = EXTRACT_16BITS(&bp[26]);
if (nsrcs > 0) {
if (len < 28 + nsrcs * sizeof(struct in6_addr))
printf(" [invalid number of sources]");
else if (vflag > 1) {
printf(" {");
for (i = 0; i < nsrcs; i++) {
TCHECK2(bp[28 + i * sizeof(struct in6_addr)],
sizeof(struct in6_addr));
printf(" %s", ip6addr_string(&bp[28 + i * sizeof(struct in6_addr)]));
}
printf(" }");
} else
printf(", %d source(s)", nsrcs);
}
printf("]");
return;
trunc:
(void)printf("[|icmp6]");
return;
}
static void
dnsname_print(const u_char *cp, const u_char *ep)
{
int i;
/* DNS name decoding - no decompression */
printf(", \"");
while (cp < ep) {
i = *cp++;
if (i) {
if (i > ep - cp) {
printf("???");
break;
}
while (i-- && cp < ep) {
safeputchar(*cp);
cp++;
}
if (cp + 1 < ep && *cp)
printf(".");
} else {
if (cp == ep) {
/* FQDN */
printf(".");
} else if (cp + 1 == ep && *cp == '\0') {
/* truncated */
} else {
/* invalid */
printf("???");
}
break;
}
}
printf("\"");
}
static void
icmp6_nodeinfo_print(u_int icmp6len, const u_char *bp, const u_char *ep)
{
struct icmp6_nodeinfo *ni6;
struct icmp6_hdr *dp;
const u_char *cp;
size_t siz, i;
int needcomma;
if (ep < bp)
return;
dp = (struct icmp6_hdr *)bp;
ni6 = (struct icmp6_nodeinfo *)bp;
siz = ep - bp;
switch (ni6->ni_type) {
case ICMP6_NI_QUERY:
if (siz == sizeof(*dp) + 4) {
/* KAME who-are-you */
printf(" who-are-you request");
break;
}
printf(" node information query");
TCHECK2(*dp, sizeof(*ni6));
ni6 = (struct icmp6_nodeinfo *)dp;
printf(" ("); /*)*/
switch (EXTRACT_16BITS(&ni6->ni_qtype)) {
case NI_QTYPE_NOOP:
printf("noop");
break;
case NI_QTYPE_SUPTYPES:
printf("supported qtypes");
i = EXTRACT_16BITS(&ni6->ni_flags);
if (i)
printf(" [%s]", (i & 0x01) ? "C" : "");
break;
break;
case NI_QTYPE_FQDN:
printf("DNS name");
break;
case NI_QTYPE_NODEADDR:
printf("node addresses");
i = ni6->ni_flags;
if (!i)
break;
/* NI_NODEADDR_FLAG_TRUNCATE undefined for query */
printf(" [%s%s%s%s%s%s]",
(i & NI_NODEADDR_FLAG_ANYCAST) ? "a" : "",
(i & NI_NODEADDR_FLAG_GLOBAL) ? "G" : "",
(i & NI_NODEADDR_FLAG_SITELOCAL) ? "S" : "",
(i & NI_NODEADDR_FLAG_LINKLOCAL) ? "L" : "",
(i & NI_NODEADDR_FLAG_COMPAT) ? "C" : "",
(i & NI_NODEADDR_FLAG_ALL) ? "A" : "");
break;
default:
printf("unknown");
break;
}
if (ni6->ni_qtype == NI_QTYPE_NOOP ||
ni6->ni_qtype == NI_QTYPE_SUPTYPES) {
if (siz != sizeof(*ni6))
if (vflag)
printf(", invalid len");
/*(*/
printf(")");
break;
}
/* XXX backward compat, icmp-name-lookup-03 */
if (siz == sizeof(*ni6)) {
printf(", 03 draft");
/*(*/
printf(")");
break;
}
switch (ni6->ni_code) {
case ICMP6_NI_SUBJ_IPV6:
if (!TTEST2(*dp,
sizeof(*ni6) + sizeof(struct in6_addr)))
break;
if (siz != sizeof(*ni6) + sizeof(struct in6_addr)) {
if (vflag)
printf(", invalid subject len");
break;
}
printf(", subject=%s",
getname6((const u_char *)(ni6 + 1)));
break;
case ICMP6_NI_SUBJ_FQDN:
printf(", subject=DNS name");
cp = (const u_char *)(ni6 + 1);
if (cp[0] == ep - cp - 1) {
/* icmp-name-lookup-03, pascal string */
if (vflag)
printf(", 03 draft");
cp++;
printf(", \"");
while (cp < ep) {
safeputchar(*cp);
cp++;
}
printf("\"");
} else
dnsname_print(cp, ep);
break;
case ICMP6_NI_SUBJ_IPV4:
if (!TTEST2(*dp, sizeof(*ni6) + sizeof(struct in_addr)))
break;
if (siz != sizeof(*ni6) + sizeof(struct in_addr)) {
if (vflag)
printf(", invalid subject len");
break;
}
printf(", subject=%s",
getname((const u_char *)(ni6 + 1)));
break;
default:
printf(", unknown subject");
break;
}
/*(*/
printf(")");
break;
case ICMP6_NI_REPLY:
if (icmp6len > siz) {
printf("[|icmp6: node information reply]");
break;
}
needcomma = 0;
ni6 = (struct icmp6_nodeinfo *)dp;
printf(" node information reply");
printf(" ("); /*)*/
switch (ni6->ni_code) {
case ICMP6_NI_SUCCESS:
if (vflag) {
printf("success");
needcomma++;
}
break;
case ICMP6_NI_REFUSED:
printf("refused");
needcomma++;
if (siz != sizeof(*ni6))
if (vflag)
printf(", invalid length");
break;
case ICMP6_NI_UNKNOWN:
printf("unknown");
needcomma++;
if (siz != sizeof(*ni6))
if (vflag)
printf(", invalid length");
break;
}
if (ni6->ni_code != ICMP6_NI_SUCCESS) {
/*(*/
printf(")");
break;
}
switch (EXTRACT_16BITS(&ni6->ni_qtype)) {
case NI_QTYPE_NOOP:
if (needcomma)
printf(", ");
printf("noop");
if (siz != sizeof(*ni6))
if (vflag)
printf(", invalid length");
break;
case NI_QTYPE_SUPTYPES:
if (needcomma)
printf(", ");
printf("supported qtypes");
i = EXTRACT_16BITS(&ni6->ni_flags);
if (i)
printf(" [%s]", (i & 0x01) ? "C" : "");
break;
case NI_QTYPE_FQDN:
if (needcomma)
printf(", ");
printf("DNS name");
cp = (const u_char *)(ni6 + 1) + 4;
if (cp[0] == ep - cp - 1) {
/* icmp-name-lookup-03, pascal string */
if (vflag)
printf(", 03 draft");
cp++;
printf(", \"");
while (cp < ep) {
safeputchar(*cp);
cp++;
}
printf("\"");
} else
dnsname_print(cp, ep);
if ((EXTRACT_16BITS(&ni6->ni_flags) & 0x01) != 0)
printf(" [TTL=%u]", *(u_int32_t *)(ni6 + 1));
break;
case NI_QTYPE_NODEADDR:
if (needcomma)
printf(", ");
printf("node addresses");
i = sizeof(*ni6);
while (i < siz) {
if (i + sizeof(struct in6_addr) + sizeof(int32_t) > siz)
break;
printf(" %s", getname6(bp + i));
i += sizeof(struct in6_addr);
printf("(%d)", (int32_t)EXTRACT_32BITS(bp + i));
i += sizeof(int32_t);
}
i = ni6->ni_flags;
if (!i)
break;
printf(" [%s%s%s%s%s%s%s]",
(i & NI_NODEADDR_FLAG_ANYCAST) ? "a" : "",
(i & NI_NODEADDR_FLAG_GLOBAL) ? "G" : "",
(i & NI_NODEADDR_FLAG_SITELOCAL) ? "S" : "",
(i & NI_NODEADDR_FLAG_LINKLOCAL) ? "L" : "",
(i & NI_NODEADDR_FLAG_COMPAT) ? "C" : "",
(i & NI_NODEADDR_FLAG_ALL) ? "A" : "",
(i & NI_NODEADDR_FLAG_TRUNCATE) ? "T" : "");
break;
default:
if (needcomma)
printf(", ");
printf("unknown");
break;
}
/*(*/
printf(")");
break;
}
return;
trunc:
fputs("[|icmp6]", stdout);
}
static void
icmp6_rrenum_print(const u_char *bp, const u_char *ep)
{
struct icmp6_router_renum *rr6;
const char *cp;
struct rr_pco_match *match;
struct rr_pco_use *use;
char hbuf[NI_MAXHOST];
int n;
if (ep < bp)
return;
rr6 = (struct icmp6_router_renum *)bp;
cp = (const char *)(rr6 + 1);
TCHECK(rr6->rr_reserved);
switch (rr6->rr_code) {
case ICMP6_ROUTER_RENUMBERING_COMMAND:
printf("router renum: command");
break;
case ICMP6_ROUTER_RENUMBERING_RESULT:
printf("router renum: result");
break;
case ICMP6_ROUTER_RENUMBERING_SEQNUM_RESET:
printf("router renum: sequence number reset");
break;
default:
printf("router renum: code-#%d", rr6->rr_code);
break;
}
printf(", seq=%u", EXTRACT_32BITS(&rr6->rr_seqnum));
if (vflag) {
#define F(x, y) ((rr6->rr_flags) & (x) ? (y) : "")
printf("["); /*]*/
if (rr6->rr_flags) {
printf("%s%s%s%s%s,", F(ICMP6_RR_FLAGS_TEST, "T"),
F(ICMP6_RR_FLAGS_REQRESULT, "R"),
F(ICMP6_RR_FLAGS_FORCEAPPLY, "A"),
F(ICMP6_RR_FLAGS_SPECSITE, "S"),
F(ICMP6_RR_FLAGS_PREVDONE, "P"));
}
printf("seg=%u,", rr6->rr_segnum);
printf("maxdelay=%u", EXTRACT_16BITS(&rr6->rr_maxdelay));
if (rr6->rr_reserved)
printf("rsvd=0x%x", EXTRACT_32BITS(&rr6->rr_reserved));
/*[*/
printf("]");
#undef F
}
if (rr6->rr_code == ICMP6_ROUTER_RENUMBERING_COMMAND) {
match = (struct rr_pco_match *)cp;
cp = (const char *)(match + 1);
TCHECK(match->rpm_prefix);
if (vflag > 1)
printf("\n\t");
else
printf(" ");
printf("match("); /*)*/
switch (match->rpm_code) {
case RPM_PCO_ADD: printf("add"); break;
case RPM_PCO_CHANGE: printf("change"); break;
case RPM_PCO_SETGLOBAL: printf("setglobal"); break;
default: printf("#%u", match->rpm_code); break;
}
if (vflag) {
printf(",ord=%u", match->rpm_ordinal);
printf(",min=%u", match->rpm_minlen);
printf(",max=%u", match->rpm_maxlen);
}
if (inet_ntop(AF_INET6, &match->rpm_prefix, hbuf, sizeof(hbuf)))
printf(",%s/%u", hbuf, match->rpm_matchlen);
else
printf(",?/%u", match->rpm_matchlen);
/*(*/
printf(")");
n = match->rpm_len - 3;
if (n % 4)
goto trunc;
n /= 4;
while (n-- > 0) {
use = (struct rr_pco_use *)cp;
cp = (const char *)(use + 1);
TCHECK(use->rpu_prefix);
if (vflag > 1)
printf("\n\t");
else
printf(" ");
printf("use("); /*)*/
if (use->rpu_flags) {
#define F(x, y) ((use->rpu_flags) & (x) ? (y) : "")
printf("%s%s,",
F(ICMP6_RR_PCOUSE_FLAGS_DECRVLTIME, "V"),
F(ICMP6_RR_PCOUSE_FLAGS_DECRPLTIME, "P"));
#undef F
}
if (vflag) {
printf("mask=0x%x,", use->rpu_ramask);
printf("raflags=0x%x,", use->rpu_raflags);
if (~use->rpu_vltime == 0)
printf("vltime=infty,");
else
printf("vltime=%u,",
EXTRACT_32BITS(&use->rpu_vltime));
if (~use->rpu_pltime == 0)
printf("pltime=infty,");
else
printf("pltime=%u,",
EXTRACT_32BITS(&use->rpu_pltime));
}
if (inet_ntop(AF_INET6, &use->rpu_prefix, hbuf,
sizeof(hbuf)))
printf("%s/%u/%u", hbuf, use->rpu_uselen,
use->rpu_keeplen);
else
printf("?/%u/%u", use->rpu_uselen,
use->rpu_keeplen);
/*(*/
printf(")");
}
}
return;
trunc:
fputs("[|icmp6]", stdout);
}
#endif /* INET6 */
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