fix(native): accept physical TCP header options

product-source/hololake-platform/guanghu-os/scripts/qemu-native-net-peer.py

@@ -104,7 +104,10 @@ def tcp_frame(
     sequence: int,
     acknowledgement: int,
     payload: bytes = b"",
+    options: bytes = b"",
 ) -> bytes:
+    if len(options) % 4 or len(options) > 40:
+        raise ValueError("TCP options must be 32-bit aligned and no more than 40 bytes")
     tcp = bytearray(
         struct.pack(
             "!HHIIBBHHH",
@@ -112,12 +115,13 @@ def tcp_frame(
             ANCHOR_PORT,
             sequence,
             acknowledgement,
-            5 << 4,
+            (5 + len(options) // 4) << 4,
             flags,
             16384,
             0,
             0,
         )
+        + options
         + payload
     )
     pseudo = GATEWAY_IP + GUEST_IP + b"\0\x06" + struct.pack("!H", len(tcp))
@@ -228,6 +232,7 @@ def main() -> None:
                         ANCHOR_CLIENT_SEQUENCE + 1,
                         server_sequence + 1,
                         request,
+                        options=b"\x01\x01\x08\x0a\xd8\x8d\xec\x56\x00\x00\x00\x01",
                     ),
                     qemu,
                 )
@@ -284,7 +289,18 @@ def main() -> None:
             and sequence == 6
             and not anchor_syn_sent
         ):
-            peer.sendto(tcp_frame(0x02, ANCHOR_CLIENT_SEQUENCE, 0), qemu)
+            peer.sendto(
+                tcp_frame(
+                    0x02,
+                    ANCHOR_CLIENT_SEQUENCE,
+                    0,
+                    options=(
+                        b"\x02\x04\x05\x90\x04\x02\x08\x0a"
+                        b"\xd8\x8d\xec\x56\x00\x00\x00\x00\x01\x03\x03\x07"
+                    ),
+                ),
+                qemu,
+            )
             anchor_syn_sent = True
 
         terminal = (