static void
_parsePerHopV0(const uint8_t *packet, size_t offset, size_t endHeaders, MetisTlvSkeleton *skeleton)
{
int foundCount = 0;
const size_t tl_length = 4;
// we only parse to the end of the per-hop headers or until we've found
// the 1 header we want is hoplimit. Others ignored.
while (offset < endHeaders && foundCount < 1) {
MetisTlvType *tlv = (MetisTlvType *) (packet + offset);
uint16_t type = htons(tlv->type);
uint16_t v_length = htons(tlv->length);
// move past the TL header
offset += tl_length;
switch (type) {
case T_HOPLIMIT:
metisTlvSkeleton_SetHopLimit(skeleton, offset, v_length);
foundCount++;
break;
default:
break;
}
offset += v_length;
}
}
static bool
_parse(MetisTlvSkeleton *skeleton)
{
bool success = false;
_MetisTlvFixedHeaderV1 *hdr = (_MetisTlvFixedHeaderV1 *) metisTlvSkeleton_GetPacket(skeleton);
// this function should only be called for version 1 packets
trapUnexpectedStateIf(hdr->version != 1, "Version not 1");
if (_goodPacketType(hdr->packetType) && hdr->headerLength >= sizeof(_MetisTlvFixedHeaderV1)) {
size_t endHeaders = hdr->headerLength;
size_t endPacket = htons(hdr->packetLength);
if (endPacket >= endHeaders) {
if (_isPacketTypeInterest((uint8_t *) hdr)) {
metisTlvSkeleton_SetHopLimit(skeleton, 4, 1);
}
_parsePerHopV1(metisTlvSkeleton_GetPacket(skeleton), sizeof(_MetisTlvFixedHeaderV1), endHeaders, skeleton);
size_t offset = _parseMessage(metisTlvSkeleton_GetPacket(skeleton), endHeaders, endPacket, skeleton);
_parseValidationAlg(metisTlvSkeleton_GetPacket(skeleton), offset, endPacket, skeleton);
success = true;
}
}
return success;
}