/*
* Copyright (C) 1998 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.
*/
static int
ip6_sopt_print(netdissect_options *ndo, const u_char *bp, int len)
{
int i;
int optlen;
for (i = 0; i < len; i += optlen) {
if (GET_U_1(bp + i) == IP6OPT_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;
switch (GET_U_1(bp + i)) {
case IP6OPT_PAD1:
ND_PRINT(", pad1");
break;
case IP6OPT_PADN:
if (len - i < IP6OPT_MINLEN) {
ND_PRINT(", padn: trunc");
goto trunc;
}
ND_PRINT(", padn");
break;
default:
if (len - i < IP6OPT_MINLEN) {
ND_PRINT(", sopt_type %u: trunc)", GET_U_1(bp + i));
goto trunc;
}
ND_PRINT(", sopt_type 0x%02x: len=%u", GET_U_1(bp + i),
GET_U_1(bp + i + 1));
break;
}
}
return 0;
trunc:
return -1;
}
static int
ip6_opt_process(netdissect_options *ndo, const u_char *bp, int len,
int *found_jumbop, uint32_t *payload_len)
{
int i;
int optlen = 0;
int found_jumbo = 0;
uint32_t jumbolen = 0;
if (len == 0)
return 0;
for (i = 0; i < len; i += optlen) {
if (GET_U_1(bp + i) == IP6OPT_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;
switch (GET_U_1(bp + i)) {
case IP6OPT_PAD1:
if (ndo->ndo_vflag)
ND_PRINT("(pad1)");
break;
case IP6OPT_PADN:
if (len - i < IP6OPT_MINLEN) {
ND_PRINT("(padn: trunc)");
goto trunc;
}
if (ndo->ndo_vflag)
ND_PRINT("(padn)");
break;
case IP6OPT_ROUTER_ALERT:
if (len - i < IP6OPT_RTALERT_LEN) {
ND_PRINT("(rtalert: trunc)");
goto trunc;
}
if (GET_U_1(bp + i + 1) != IP6OPT_RTALERT_LEN - 2) {
ND_PRINT("(rtalert: invalid len %u)", GET_U_1(bp + i + 1));
goto trunc;
}
if (ndo->ndo_vflag)
ND_PRINT("(rtalert: 0x%04x) ", GET_BE_U_2(bp + i + 2));
break;
case IP6OPT_JUMBO:
if (len - i < IP6OPT_JUMBO_LEN) {
ND_PRINT("(jumbo: trunc)");
goto trunc;
}
if (GET_U_1(bp + i + 1) != IP6OPT_JUMBO_LEN - 2) {
ND_PRINT("(jumbo: invalid len %u)", GET_U_1(bp + i + 1));
goto trunc;
}
jumbolen = GET_BE_U_4(bp + i + 2);
if (found_jumbo) {
/* More than one Jumbo Payload option */
if (ndo->ndo_vflag)
ND_PRINT("(jumbo: %u - already seen) ", jumbolen);
} else {
found_jumbo = 1;
if (payload_len == NULL) {
/* Not a hop-by-hop option - not valid */
if (ndo->ndo_vflag)
ND_PRINT("(jumbo: %u - not a hop-by-hop option) ", jumbolen);
} else if (*payload_len != 0) {
/* Payload length was non-zero - not valid */
if (ndo->ndo_vflag)
ND_PRINT("(jumbo: %u - payload len != 0) ", jumbolen);
} else {
/*
* This is a hop-by-hop option, and Payload length
* was zero in the IPv6 header.
*/
if (jumbolen < 65536) {
/* Too short */
if (ndo->ndo_vflag)
ND_PRINT("(jumbo: %u - < 65536) ", jumbolen);
} else {
/* OK, this is valid */
*found_jumbop = 1;
*payload_len = jumbolen;
if (ndo->ndo_vflag)
ND_PRINT("(jumbo: %u) ", jumbolen);
}
}
}
break;
case IP6OPT_HOME_ADDRESS:
if (len - i < IP6OPT_HOMEADDR_MINLEN) {
ND_PRINT("(homeaddr: trunc)");
goto trunc;
}
if (GET_U_1(bp + i + 1) < IP6OPT_HOMEADDR_MINLEN - 2) {
ND_PRINT("(homeaddr: invalid len %u)", GET_U_1(bp + i + 1));
goto trunc;
}
if (ndo->ndo_vflag) {
ND_PRINT("(homeaddr: %s", GET_IP6ADDR_STRING(bp + i + 2));
if (GET_U_1(bp + i + 1) > IP6OPT_HOMEADDR_MINLEN - 2) {
if (ip6_sopt_print(ndo, bp + i + IP6OPT_HOMEADDR_MINLEN,
(optlen - IP6OPT_HOMEADDR_MINLEN)) == -1)
goto trunc;
}
ND_PRINT(")");
}
break;
default:
if (len - i < IP6OPT_MINLEN) {
ND_PRINT("(type %u: trunc)", GET_U_1(bp + i));
goto trunc;
}
if (ndo->ndo_vflag)
ND_PRINT("(opt_type 0x%02x: len=%u)", GET_U_1(bp + i),
GET_U_1(bp + i + 1));
break;
}
}
if (ndo->ndo_vflag)
ND_PRINT(" ");
return 0;
