RNDIS_HEADER_OFFSET
limit += RNDIS_HEADER_OFFSET;
le32toh(msg->rm_infobufoffset) + RNDIS_HEADER_OFFSET,
*buf = ((const uint8_t *)msg) + RNDIS_HEADER_OFFSET + le32toh(msg->rm_infobufoffset);
msg->rm_infobufoffset = htole32(sizeof(*msg) - RNDIS_HEADER_OFFSET);
#define RNDIS_DATA_OFFSET ((uint32_t)(sizeof(struct urndis_packet_msg) - RNDIS_HEADER_OFFSET))