with Scapy I can sniff packets and filter by destination.
sniff(filter="dst <ip addr>")
How do I use Scapy to only forward packets that are being sent to that specific ip address?
You can use the prn argument for sniff like this
sniff(filter="your ip address", prn=process_packet)
Where process_packet is a method that do what you need, like this
def process_packet(pkt):
here you do what you need with the sniffed packet
Sniff function will apply process_packet to every packet that is sniffed.
Hope this is what you asked.