void
ip6_opt_print(const u_char *bp, int len)
{
int i;
int optlen = 0;
for (i = 0; i < len; i += optlen) {
if (bp[i] == IP6OPT_PAD1)
optlen = 1;
else {
if (i + 1 < len)
optlen = bp[i + 1] + 2;
else
goto trunc;
}
if (i + optlen > len)
goto trunc;
switch (bp[i]) {
case IP6OPT_PAD1:
printf("(pad1)");
break;
case IP6OPT_PADN:
if (len - i < IP6OPT_MINLEN) {
printf("(padn: trunc)");
goto trunc;
}
printf("(padn)");
break;
case IP6OPT_ROUTER_ALERT:
if (len - i < IP6OPT_RTALERT_LEN) {
printf("(rtalert: trunc)");
goto trunc;
}
if (bp[i + 1] != IP6OPT_RTALERT_LEN - 2) {
printf("(rtalert: invalid len %d)", bp[i + 1]);
goto trunc;
}
printf("(rtalert: 0x%04x) ", EXTRACT_16BITS(&bp[i + 2]));
break;
case IP6OPT_JUMBO:
if (len - i < IP6OPT_JUMBO_LEN) {
printf("(jumbo: trunc)");
goto trunc;
}
if (bp[i + 1] != IP6OPT_JUMBO_LEN - 2) {
printf("(jumbo: invalid len %d)", bp[i + 1]);
goto trunc;
}
printf("(jumbo: %u) ", EXTRACT_32BITS(&bp[i + 2]));
break;
case IP6OPT_HOME_ADDRESS:
if (len - i < IP6OPT_HOMEADDR_MINLEN) {
printf("(homeaddr: trunc)");
goto trunc;
}
if (bp[i + 1] < IP6OPT_HOMEADDR_MINLEN - 2) {
printf("(homeaddr: invalid len %d)", bp[i + 1]);
goto trunc;
}
printf("(homeaddr: %s", ip6addr_string(&bp[i + 2]));
if (bp[i + 1] > IP6OPT_HOMEADDR_MINLEN - 2) {
ip6_sopt_print(&bp[i + IP6OPT_HOMEADDR_MINLEN],
(optlen - IP6OPT_HOMEADDR_MINLEN));
}
printf(")");
break;
case IP6OPT_BINDING_UPDATE:
if (len - i < IP6OPT_BU_MINLEN) {
printf("(bu: trunc)");
goto trunc;
}
if (bp[i + 1] < IP6OPT_BU_MINLEN - 2) {
printf("(bu: invalid len %d)", bp[i + 1]);
goto trunc;
}
printf("(bu: ");
if (bp[i + 2] & 0x80)
printf("A");
if (bp[i + 2] & 0x40)
printf("H");
if (bp[i + 2] & 0x20)
printf("S");
if (bp[i + 2] & 0x10)
printf("D");
if ((bp[i + 2] & 0x0f) || bp[i + 3] || bp[i + 4])
printf("res");
printf(", sequence: %u", bp[i + 5]);
printf(", lifetime: %u", EXTRACT_32BITS(&bp[i + 6]));
if (bp[i + 1] > IP6OPT_BU_MINLEN - 2) {
ip6_sopt_print(&bp[i + IP6OPT_BU_MINLEN],
(optlen - IP6OPT_BU_MINLEN));
}
printf(")");
break;
case IP6OPT_BINDING_ACK:
if (len - i < IP6OPT_BA_MINLEN) {
printf("(ba: trunc)");
goto trunc;
}
if (bp[i + 1] < IP6OPT_BA_MINLEN - 2) {
printf("(ba: invalid len %d)", bp[i + 1]);
goto trunc;
}
printf("(ba: ");
printf("status: %u", bp[i + 2]);
if (bp[i + 3])
printf("res");
printf(", sequence: %u", bp[i + 4]);
printf(", lifetime: %u", EXTRACT_32BITS(&bp[i + 5]));
printf(", refresh: %u", EXTRACT_32BITS(&bp[i + 9]));
if (bp[i + 1] > IP6OPT_BA_MINLEN - 2) {
ip6_sopt_print(&bp[i + IP6OPT_BA_MINLEN],
(optlen - IP6OPT_BA_MINLEN));
}
printf(")");
break;
case IP6OPT_BINDING_REQ:
if (len - i < IP6OPT_BR_MINLEN) {
printf("(br: trunc)");
goto trunc;
}
printf("(br");
if (bp[i + 1] > IP6OPT_BR_MINLEN - 2) {
ip6_sopt_print(&bp[i + IP6OPT_BR_MINLEN],
(optlen - IP6OPT_BR_MINLEN));
}
printf(")");
break;
default:
if (len - i < IP6OPT_MINLEN) {
printf("(type %d: trunc)", bp[i]);
goto trunc;
}
printf("(opt_type 0x%02x: len=%d) ", bp[i], bp[i + 1]);
break;
}
}
#if 0
end:
#endif
return;
trunc:
printf("[trunc] ");
}
static void
ip6_opt_print(netdissect_options *ndo, const u_char *bp, int len)
{
int i;
int optlen = 0;
if (len == 0)
return;
for (i = 0; i < len; i += optlen) {
if (bp[i] == IP6OPT_PAD1)
optlen = 1;
else {
if (i + 1 < len)
optlen = bp[i + 1] + 2;
else
goto trunc;
}
if (i + optlen > len)
goto trunc;
switch (bp[i]) {
case IP6OPT_PAD1:
ND_PRINT((ndo, "(pad1)"));
break;
case IP6OPT_PADN:
if (len - i < IP6OPT_MINLEN) {
ND_PRINT((ndo, "(padn: trunc)"));
goto trunc;
}
ND_PRINT((ndo, "(padn)"));
break;
case IP6OPT_ROUTER_ALERT:
if (len - i < IP6OPT_RTALERT_LEN) {
ND_PRINT((ndo, "(rtalert: trunc)"));
goto trunc;
}
if (bp[i + 1] != IP6OPT_RTALERT_LEN - 2) {
ND_PRINT((ndo, "(rtalert: invalid len %d)", bp[i + 1]));
goto trunc;
}
ND_PRINT((ndo, "(rtalert: 0x%04x) ", EXTRACT_16BITS(&bp[i + 2])));
break;
case IP6OPT_JUMBO:
if (len - i < IP6OPT_JUMBO_LEN) {
ND_PRINT((ndo, "(jumbo: trunc)"));
goto trunc;
}
if (bp[i + 1] != IP6OPT_JUMBO_LEN - 2) {
ND_PRINT((ndo, "(jumbo: invalid len %d)", bp[i + 1]));
goto trunc;
}
ND_PRINT((ndo, "(jumbo: %u) ", EXTRACT_32BITS(&bp[i + 2])));
break;
case IP6OPT_HOME_ADDRESS:
if (len - i < IP6OPT_HOMEADDR_MINLEN) {
ND_PRINT((ndo, "(homeaddr: trunc)"));
goto trunc;
}
if (bp[i + 1] < IP6OPT_HOMEADDR_MINLEN - 2) {
ND_PRINT((ndo, "(homeaddr: invalid len %d)", bp[i + 1]));
goto trunc;
}
ND_PRINT((ndo, "(homeaddr: %s", ip6addr_string(ndo, &bp[i + 2])));
if (bp[i + 1] > IP6OPT_HOMEADDR_MINLEN - 2) {
ip6_sopt_print(ndo, &bp[i + IP6OPT_HOMEADDR_MINLEN],
(optlen - IP6OPT_HOMEADDR_MINLEN));
}
ND_PRINT((ndo, ")"));
break;
default:
if (len - i < IP6OPT_MINLEN) {
ND_PRINT((ndo, "(type %d: trunc)", bp[i]));
goto trunc;
}
ND_PRINT((ndo, "(opt_type 0x%02x: len=%d)", bp[i], bp[i + 1]));
break;
}
}
ND_PRINT((ndo, " "));
return;
trunc:
ND_PRINT((ndo, "[trunc] "));
}
