sock_hc: only report releases for listening TCP sockets#75
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Paired host-side change: rehosting/penguin#822 (NetBinds debounce + transient lifecycle tracking). |
igloo_sock_release fired for any socket release, including accepted and connected sockets that share a listener's local port. A client disconnecting from a service therefore looked like the listener itself closing — most damaging for loopback services bound to 127.0.0.1, whose connections share the bound address. Gate TCP releases on sk_state == TCP_LISTEN so only genuine listener shutdowns are reported; UDP behavior is unchanged. This pairs with the host-side NetBinds lifecycle tracking in rehosting/penguin.
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Summary
igloo_sock_releasefired a release hypercall for any socket release, including accepted/connected sockets that share a listener's local port. A client disconnecting from a service therefore looked like the listener itself closing — most damaging for loopback services bound to127.0.0.1, whose connections share the bound address.Gate TCP releases on
sk->sk_state == TCP_LISTEN(both IPv4 and IPv6) so only genuine listener shutdowns are reported. UDP behavior is unchanged. Adds#include <net/tcp_states.h>for the constant.The hook runs before
inet_release/tcp_close(it already reads a liveinet_sport), so a listener is still inTCP_LISTENat this point.Why
Pairs with the host-side socket lifecycle tracking in rehosting/penguin#822 (NetBinds debounce + transient labeling): without this guard, connection teardowns would be mislabeled as service closes / flaps.
Validation
./build.sh(no warnings fromsock_hc.c); module loads in-guest.TCP_LISTEN/sk_stateare stable across 4.10 and 6.13.