Use scapy to send real packets

hw/super6502_fpga/src/sub/network_processor/sim/cocotb/tests/scapy_irl_test.py

+from scapy.layers.inet import Ether, IP, TCP
+from scapy.layers.l2 import ARP
+
+from scapy import sendrecv
+
+from scapy.config import conf
+
+from scapy.supersocket import L3RawSocket
+
+
+import socket
+
+# In order for this to work, you need to run these commands:
+# sudo setcap cap_net_raw=eip $(readlink -f $(which python))
+# sudo iptables -A OUTPUT -p tcp --tcp-flags RST RST -s 127.0.0.1 -j DROP
+
+def main():
+    serversocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    serversocket.bind(("127.0.0.1", 5678))
+    serversocket.listen(5)
+
+    conf.L3socket = L3RawSocket
+
+    tcp_syn = IP(dst="127.0.0.1")/TCP(sport=1234, dport=5678, seq=0, ack=0, flags="S")
+    sendrecv.send(tcp_syn, iface="lo")
+
+    pkt = sendrecv.sniff(filter="tcp src port 5678", iface="lo", count=1)[0]
+    print(pkt)
+
+
+if __name__ == "__main__":
+    main()
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