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feat: add configurable TCP flags for GFK backend (#21)

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Add GFK_TCP_FLAGS setting to allow customizing TCP flags used in
violated TCP packets. This addresses cases where different flag
combinations (e.g. 'S', 'RA') may work better for certain networks.

Changes:
- Add tcp_flags parameter to vio_server.py and vio_client.py
- Add GFK_TCP_FLAGS to settings save/load with validation
- Add TCP flags menu option in change config for both server/client
- Default remains 'AP' for backwards compatibility

Validation: Only uppercase TCP flags allowed (F,S,R,P,A,U,E,C)
This commit is contained in:
SamNet-dev
2026-02-04 19:17:44 -06:00
parent 4b14413623
commit e1cf7a9d3b
3 changed files with 32 additions and 3 deletions
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5
gfk/client/vio_client.py
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@@ -13,6 +13,7 @@ vio_tcp_client_port = parameters.vio_tcp_client_port
vio_udp_client_port = parameters.vio_udp_client_port
quic_local_ip = parameters.quic_local_ip
quic_client_port = parameters.quic_client_port
tcp_flags = getattr(parameters, 'tcp_flags', 'AP')
# Windows-specific: get local IP and gateway MAC for Ethernet frames
my_ip = getattr(parameters, 'my_ip', None)
@@ -73,11 +74,11 @@ async def forward_vio_to_quic(qu1, transport):
# Build base packet based on OS
if is_windows and gateway_mac and my_ip and local_mac:
logger.info(f"Windows mode: using Ethernet frames (gw_mac={gateway_mac}, my_ip={my_ip})")
basepkt = Ether(dst=gateway_mac, src=local_mac) / IP(src=my_ip, dst=vps_ip) / TCP(sport=vio_tcp_client_port, dport=vio_tcp_server_port, seq=0, flags="AP", ack=0, options=tcp_options) / Raw(load=b"")
basepkt = Ether(dst=gateway_mac, src=local_mac) / IP(src=my_ip, dst=vps_ip) / TCP(sport=vio_tcp_client_port, dport=vio_tcp_server_port, seq=0, flags=tcp_flags, ack=0, options=tcp_options) / Raw(load=b"")
skt = conf.L2socket(iface=conf.iface)
else:
logger.info(f"Linux mode: using L3 socket")
basepkt = IP(dst=vps_ip) / TCP(sport=vio_tcp_client_port, dport=vio_tcp_server_port, seq=0, flags="AP", ack=0, options=tcp_options) / Raw(load=b"")
basepkt = IP(dst=vps_ip) / TCP(sport=vio_tcp_client_port, dport=vio_tcp_server_port, seq=0, flags=tcp_flags, ack=0, options=tcp_options) / Raw(load=b"")
skt = conf.L3socket()