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abc8c2d61c
tcpdump/print-mobility.c
Francois-Xavier Le Bail abc8c2d61c Remove many (762) now redundant ND_TCHECK_n() calls 
ND_TCHECK_n(e), n in { 1, 2, 3, 4, 8 }.

They are redundant because they are followed by a GET_.*_n(e) call,
same n, same e, which do the bounds check.

Remove unused 'trunc' labels and most associated codes.

Update the outputs of some tests accordingly.
2020-09-06 20:22:29 +02:00

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/*
* Copyright (C) 2002 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 mobility printer */
/* RFC 3775 */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "netdissect-stdinc.h"
#include "netdissect.h"
#include "addrtoname.h"
#include "extract.h"
#include "ip6.h"
/* Mobility header */
struct ip6_mobility {
nd_uint8_t ip6m_pproto; /* following payload protocol (for PG) */
nd_uint8_t ip6m_len; /* length in units of 8 octets */
nd_uint8_t ip6m_type; /* message type */
nd_uint8_t reserved; /* reserved */
nd_uint16_t ip6m_cksum; /* sum of IPv6 pseudo-header and MH */
union {
nd_uint16_t ip6m_un_data16[1]; /* type-specific field */
nd_uint8_t ip6m_un_data8[2]; /* type-specific field */
} ip6m_dataun;
};
#define ip6m_data16 ip6m_dataun.ip6m_un_data16
#define ip6m_data8 ip6m_dataun.ip6m_un_data8
#define IP6M_MINLEN 8
/* https://www.iana.org/assignments/mobility-parameters/mobility-parameters.xhtml */
/* message type */
#define IP6M_BINDING_REQUEST 0 /* Binding Refresh Request */
#define IP6M_HOME_TEST_INIT 1 /* Home Test Init */
#define IP6M_CAREOF_TEST_INIT 2 /* Care-of Test Init */
#define IP6M_HOME_TEST 3 /* Home Test */
#define IP6M_CAREOF_TEST 4 /* Care-of Test */
#define IP6M_BINDING_UPDATE 5 /* Binding Update */
#define IP6M_BINDING_ACK 6 /* Binding Acknowledgement */
#define IP6M_BINDING_ERROR 7 /* Binding Error */
#define IP6M_MAX 7
static const struct tok ip6m_str[] = {
{ IP6M_BINDING_REQUEST, "BRR" },
{ IP6M_HOME_TEST_INIT, "HoTI" },
{ IP6M_CAREOF_TEST_INIT, "CoTI" },
{ IP6M_HOME_TEST, "HoT" },
{ IP6M_CAREOF_TEST, "CoT" },
{ IP6M_BINDING_UPDATE, "BU" },
{ IP6M_BINDING_ACK, "BA" },
{ IP6M_BINDING_ERROR, "BE" },
{ 0, NULL }
};
static const unsigned ip6m_hdrlen[IP6M_MAX + 1] = {
IP6M_MINLEN, /* IP6M_BINDING_REQUEST */
IP6M_MINLEN + 8, /* IP6M_HOME_TEST_INIT */
IP6M_MINLEN + 8, /* IP6M_CAREOF_TEST_INIT */
IP6M_MINLEN + 16, /* IP6M_HOME_TEST */
IP6M_MINLEN + 16, /* IP6M_CAREOF_TEST */
IP6M_MINLEN + 4, /* IP6M_BINDING_UPDATE */
IP6M_MINLEN + 4, /* IP6M_BINDING_ACK */
IP6M_MINLEN + 16, /* IP6M_BINDING_ERROR */
};
/* Mobility Header Options */
#define IP6MOPT_MINLEN 2
#define IP6MOPT_PAD1 0x0 /* Pad1 */
#define IP6MOPT_PADN 0x1 /* PadN */
#define IP6MOPT_REFRESH 0x2 /* Binding Refresh Advice */
#define IP6MOPT_REFRESH_MINLEN 4
#define IP6MOPT_ALTCOA 0x3 /* Alternate Care-of Address */
#define IP6MOPT_ALTCOA_MINLEN 18
#define IP6MOPT_NONCEID 0x4 /* Nonce Indices */
#define IP6MOPT_NONCEID_MINLEN 6
#define IP6MOPT_AUTH 0x5 /* Binding Authorization Data */
#define IP6MOPT_AUTH_MINLEN 12
static int
mobility_opt_print(netdissect_options *ndo,
const u_char *bp, const unsigned len)
{
unsigned i, optlen;
for (i = 0; i < len; i += optlen) {
if (GET_U_1(bp + i) == IP6MOPT_PAD1)
optlen = 1;
else {
if (i + 1 < len) {
optlen = GET_U_1(bp + i + 1) + 2;
}
else
goto trunc;
}
if (i + optlen > len)
goto trunc;
ND_TCHECK_1(bp + i + optlen);
switch (GET_U_1(bp + i)) {
case IP6MOPT_PAD1:
ND_PRINT("(pad1)");
break;
case IP6MOPT_PADN:
if (len - i < IP6MOPT_MINLEN) {
ND_PRINT("(padn: trunc)");
goto trunc;
}
ND_PRINT("(padn)");
break;
case IP6MOPT_REFRESH:
if (len - i < IP6MOPT_REFRESH_MINLEN) {
ND_PRINT("(refresh: trunc)");
goto trunc;
}
/* units of 4 secs */
ND_PRINT("(refresh: %u)",
GET_BE_U_2(bp + i + 2) << 2);
break;
case IP6MOPT_ALTCOA:
if (len - i < IP6MOPT_ALTCOA_MINLEN) {
ND_PRINT("(altcoa: trunc)");
goto trunc;
}
ND_TCHECK_16(bp + i + 2);
ND_PRINT("(alt-CoA: %s)", GET_IP6ADDR_STRING(bp + i + 2));
break;
case IP6MOPT_NONCEID:
if (len - i < IP6MOPT_NONCEID_MINLEN) {
ND_PRINT("(ni: trunc)");
goto trunc;
}
ND_PRINT("(ni: ho=0x%04x co=0x%04x)",
GET_BE_U_2(bp + i + 2),
GET_BE_U_2(bp + i + 4));
break;
case IP6MOPT_AUTH:
if (len - i < IP6MOPT_AUTH_MINLEN) {
ND_PRINT("(auth: trunc)");
goto trunc;
}
ND_PRINT("(auth)");
break;
default:
if (len - i < IP6MOPT_MINLEN) {
ND_PRINT("(sopt_type %u: trunc)",
GET_U_1(bp + i));
goto trunc;
}
ND_PRINT("(type-0x%02x: len=%u)", GET_U_1(bp + i),
GET_U_1(bp + i + 1));
break;
}
}
return 0;
trunc:
return 1;
}
/*
* Mobility Header
*/
int
mobility_print(netdissect_options *ndo,
const u_char *bp, const u_char *bp2 _U_)
{
const struct ip6_mobility *mh;
const u_char *ep;
unsigned mhlen, hlen;
uint8_t type;
ndo->ndo_protocol = "mobility";
mh = (const struct ip6_mobility *)bp;
/* 'ep' points to the end of available data. */
ep = ndo->ndo_snapend;
if (!ND_TTEST_1(mh->ip6m_len)) {
/*
* There's not enough captured data to include the
* mobility header length.
*
* Our caller expects us to return the length, however,
* so return a value that will run to the end of the
* captured data.
*
* XXX - "ip6_print()" doesn't do anything with the
* returned length, however, as it breaks out of the
* header-processing loop.
*/
mhlen = (unsigned)(ep - bp);
goto trunc;
}
mhlen = (GET_U_1(mh->ip6m_len) + 1) << 3;
/* XXX ip6m_cksum */
type = GET_U_1(mh->ip6m_type);
if (type <= IP6M_MAX && mhlen < ip6m_hdrlen[type]) {
ND_PRINT("(header length %u is too small for type %u)", mhlen, type);
goto trunc;
}
ND_PRINT("mobility: %s", tok2str(ip6m_str, "type-#%u", type));
switch (type) {
case IP6M_BINDING_REQUEST:
hlen = IP6M_MINLEN;
break;
case IP6M_HOME_TEST_INIT:
case IP6M_CAREOF_TEST_INIT:
hlen = IP6M_MINLEN;
if (ndo->ndo_vflag) {
ND_PRINT(" %s Init Cookie=%08x:%08x",
type == IP6M_HOME_TEST_INIT ? "Home" : "Care-of",
GET_BE_U_4(bp + hlen),
GET_BE_U_4(bp + hlen + 4));
}
hlen += 8;
break;
case IP6M_HOME_TEST:
case IP6M_CAREOF_TEST:
ND_PRINT(" nonce id=0x%x", GET_BE_U_2(mh->ip6m_data16[0]));
hlen = IP6M_MINLEN;
if (ndo->ndo_vflag) {
ND_PRINT(" %s Init Cookie=%08x:%08x",
type == IP6M_HOME_TEST ? "Home" : "Care-of",
GET_BE_U_4(bp + hlen),
GET_BE_U_4(bp + hlen + 4));
}
hlen += 8;
if (ndo->ndo_vflag) {
ND_PRINT(" %s Keygen Token=%08x:%08x",
type == IP6M_HOME_TEST ? "Home" : "Care-of",
GET_BE_U_4(bp + hlen),
GET_BE_U_4(bp + hlen + 4));
}
hlen += 8;
break;
case IP6M_BINDING_UPDATE:
ND_PRINT(" seq#=%u", GET_BE_U_2(mh->ip6m_data16[0]));
hlen = IP6M_MINLEN;
ND_TCHECK_2(bp + hlen);
if (GET_U_1(bp + hlen) & 0xf0) {
ND_PRINT(" ");
if (GET_U_1(bp + hlen) & 0x80)
ND_PRINT("A");
if (GET_U_1(bp + hlen) & 0x40)
ND_PRINT("H");
if (GET_U_1(bp + hlen) & 0x20)
ND_PRINT("L");
if (GET_U_1(bp + hlen) & 0x10)
ND_PRINT("K");
}
/* Reserved (4bits) */
hlen += 1;
/* Reserved (8bits) */
hlen += 1;
/* units of 4 secs */
ND_PRINT(" lifetime=%u", GET_BE_U_2(bp + hlen) << 2);
hlen += 2;
break;
case IP6M_BINDING_ACK:
ND_PRINT(" status=%u", GET_U_1(mh->ip6m_data8[0]));
if (GET_U_1(mh->ip6m_data8[1]) & 0x80)
ND_PRINT(" K");
/* Reserved (7bits) */
hlen = IP6M_MINLEN;
ND_PRINT(" seq#=%u", GET_BE_U_2(bp + hlen));
hlen += 2;
/* units of 4 secs */
ND_PRINT(" lifetime=%u", GET_BE_U_2(bp + hlen) << 2);
hlen += 2;
break;
case IP6M_BINDING_ERROR:
ND_PRINT(" status=%u", GET_U_1(mh->ip6m_data8[0]));
/* Reserved */
hlen = IP6M_MINLEN;
ND_TCHECK_16(bp + hlen);
ND_PRINT(" homeaddr %s", GET_IP6ADDR_STRING(bp + hlen));
hlen += 16;
break;
default:
ND_PRINT(" len=%u", GET_U_1(mh->ip6m_len));
return(mhlen);
break;
}
if (ndo->ndo_vflag)
if (mobility_opt_print(ndo, bp + hlen, mhlen - hlen))
goto trunc;
return(mhlen);
trunc:
nd_print_trunc(ndo);
return(-1);
}
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