feat(net/socket): implement net reuse port by mistcoversmyeyes · Pull Request #2173 · DragonOS-Community/DragonOS

mistcoversmyeyes · 2026-08-08T11:17:49Z

Related to

feat(net): implement SO_REUSEPORT for TCP stream sockets #1848

Replace the single-owner tcp_port_table (HashMap<u16, RawPid>) with multi-binding records mirroring the UDP side. A new binding is accepted when every conflicting binding shares SO_REUSEPORT or SO_REUSEADDR with the requester. Each record is identified by (iface_nic_id, smoltcp handle), so unbinding is exact without threading an extra id through the socket state. The generic bind_port/unbind_port/bind_ephemeral_port helpers are superseded by per-protocol variants.

Store the flag in TcpSocketOptions and wire it into setsockopt/getsockopt, mirroring the existing SO_REUSEADDR handling. The value is snapshotted at bind() time, matching Linux semantics where SO_REUSEPORT must be set before bind() to participate in port sharing.

Pass SO_REUSEPORT/SO_REUSEADDR from TcpSocket options into Init::bind and Init::listen, routing port registration through bind_tcp_port and bind_tcp_ephemeral_port. Every listening smoltcp socket that belongs to a reuseport listener - the primary socket, per-interface and backlog sockets, and the replacement socket created on accept - is marked with set_reuseport so the smoltcp dispatcher can distribute SYNs across the group. All unbind call sites now release by (iface_nic_id, handle).

mistcoversmyeyes · 2026-08-08T11:17:49Z

Related to

feat(net): implement SO_REUSEPORT for TCP stream sockets #1848

Replace the single-owner tcp_port_table (HashMap<u16, RawPid>) with multi-binding records mirroring the UDP side. A new binding is accepted when every conflicting binding shares SO_REUSEPORT or SO_REUSEADDR with the requester. Each record is identified by (iface_nic_id, smoltcp handle), so unbinding is exact without threading an extra id through the socket state. The generic bind_port/unbind_port/bind_ephemeral_port helpers are superseded by per-protocol variants.

Store the flag in TcpSocketOptions and wire it into setsockopt/getsockopt, mirroring the existing SO_REUSEADDR handling. The value is snapshotted at bind() time, matching Linux semantics where SO_REUSEPORT must be set before bind() to participate in port sharing.

Pass SO_REUSEPORT/SO_REUSEADDR from TcpSocket options into Init::bind and Init::listen, routing port registration through bind_tcp_port and bind_tcp_ephemeral_port. Every listening smoltcp socket that belongs to a reuseport listener - the primary socket, per-interface and backlog sockets, and the replacement socket created on accept - is marked with set_reuseport so the smoltcp dispatcher can distribute SYNs across the group. All unbind call sites now release by (iface_nic_id, handle).

mistcoversmyeyes · 2026-08-08T11:17:49Z

Related to

feat(net): implement SO_REUSEPORT for TCP stream sockets #1848

Replace the single-owner tcp_port_table (HashMap<u16, RawPid>) with multi-binding records mirroring the UDP side. A new binding is accepted when every conflicting binding shares SO_REUSEPORT or SO_REUSEADDR with the requester. Each record is identified by (iface_nic_id, smoltcp handle), so unbinding is exact without threading an extra id through the socket state. The generic bind_port/unbind_port/bind_ephemeral_port helpers are superseded by per-protocol variants.

Store the flag in TcpSocketOptions and wire it into setsockopt/getsockopt, mirroring the existing SO_REUSEADDR handling. The value is snapshotted at bind() time, matching Linux semantics where SO_REUSEPORT must be set before bind() to participate in port sharing.

Pass SO_REUSEPORT/SO_REUSEADDR from TcpSocket options into Init::bind and Init::listen, routing port registration through bind_tcp_port and bind_tcp_ephemeral_port. Every listening smoltcp socket that belongs to a reuseport listener - the primary socket, per-interface and backlog sockets, and the replacement socket created on accept - is marked with set_reuseport so the smoltcp dispatcher can distribute SYNs across the group. All unbind call sites now release by (iface_nic_id, handle).

mistcoversmyeyes · 2026-08-08T11:17:49Z

Related to

feat(net): implement SO_REUSEPORT for TCP stream sockets #1848

Replace the single-owner tcp_port_table (HashMap<u16, RawPid>) with multi-binding records mirroring the UDP side. A new binding is accepted when every conflicting binding shares SO_REUSEPORT or SO_REUSEADDR with the requester. Each record is identified by (iface_nic_id, smoltcp handle), so unbinding is exact without threading an extra id through the socket state. The generic bind_port/unbind_port/bind_ephemeral_port helpers are superseded by per-protocol variants.

Store the flag in TcpSocketOptions and wire it into setsockopt/getsockopt, mirroring the existing SO_REUSEADDR handling. The value is snapshotted at bind() time, matching Linux semantics where SO_REUSEPORT must be set before bind() to participate in port sharing.

Pass SO_REUSEPORT/SO_REUSEADDR from TcpSocket options into Init::bind and Init::listen, routing port registration through bind_tcp_port and bind_tcp_ephemeral_port. Every listening smoltcp socket that belongs to a reuseport listener - the primary socket, per-interface and backlog sockets, and the replacement socket created on accept - is marked with set_reuseport so the smoltcp dispatcher can distribute SYNs across the group. All unbind call sites now release by (iface_nic_id, handle).

mistcoversmyeyes · 2026-08-08T11:17:49Z

Related to

feat(net): implement SO_REUSEPORT for TCP stream sockets #1848

Replace the single-owner tcp_port_table (HashMap<u16, RawPid>) with multi-binding records mirroring the UDP side. A new binding is accepted when every conflicting binding shares SO_REUSEPORT or SO_REUSEADDR with the requester. Each record is identified by (iface_nic_id, smoltcp handle), so unbinding is exact without threading an extra id through the socket state. The generic bind_port/unbind_port/bind_ephemeral_port helpers are superseded by per-protocol variants.

Store the flag in TcpSocketOptions and wire it into setsockopt/getsockopt, mirroring the existing SO_REUSEADDR handling. The value is snapshotted at bind() time, matching Linux semantics where SO_REUSEPORT must be set before bind() to participate in port sharing.

Pass SO_REUSEPORT/SO_REUSEADDR from TcpSocket options into Init::bind and Init::listen, routing port registration through bind_tcp_port and bind_tcp_ephemeral_port. Every listening smoltcp socket that belongs to a reuseport listener - the primary socket, per-interface and backlog sockets, and the replacement socket created on accept - is marked with set_reuseport so the smoltcp dispatcher can distribute SYNs across the group. All unbind call sites now release by (iface_nic_id, handle).

mistcoversmyeyes · 2026-08-08T11:17:49Z

Related to

feat(net): implement SO_REUSEPORT for TCP stream sockets #1848

Replace the single-owner tcp_port_table (HashMap<u16, RawPid>) with multi-binding records mirroring the UDP side. A new binding is accepted when every conflicting binding shares SO_REUSEPORT or SO_REUSEADDR with the requester. Each record is identified by (iface_nic_id, smoltcp handle), so unbinding is exact without threading an extra id through the socket state. The generic bind_port/unbind_port/bind_ephemeral_port helpers are superseded by per-protocol variants.

Store the flag in TcpSocketOptions and wire it into setsockopt/getsockopt, mirroring the existing SO_REUSEADDR handling. The value is snapshotted at bind() time, matching Linux semantics where SO_REUSEPORT must be set before bind() to participate in port sharing.

Pass SO_REUSEPORT/SO_REUSEADDR from TcpSocket options into Init::bind and Init::listen, routing port registration through bind_tcp_port and bind_tcp_ephemeral_port. Every listening smoltcp socket that belongs to a reuseport listener - the primary socket, per-interface and backlog sockets, and the replacement socket created on accept - is marked with set_reuseport so the smoltcp dispatcher can distribute SYNs across the group. All unbind call sites now release by (iface_nic_id, handle).

mistcoversmyeyes · 2026-08-08T11:17:49Z

Related to

feat(net): implement SO_REUSEPORT for TCP stream sockets #1848

Replace the single-owner tcp_port_table (HashMap<u16, RawPid>) with multi-binding records mirroring the UDP side. A new binding is accepted when every conflicting binding shares SO_REUSEPORT or SO_REUSEADDR with the requester. Each record is identified by (iface_nic_id, smoltcp handle), so unbinding is exact without threading an extra id through the socket state. The generic bind_port/unbind_port/bind_ephemeral_port helpers are superseded by per-protocol variants.

Store the flag in TcpSocketOptions and wire it into setsockopt/getsockopt, mirroring the existing SO_REUSEADDR handling. The value is snapshotted at bind() time, matching Linux semantics where SO_REUSEPORT must be set before bind() to participate in port sharing.

Pass SO_REUSEPORT/SO_REUSEADDR from TcpSocket options into Init::bind and Init::listen, routing port registration through bind_tcp_port and bind_tcp_ephemeral_port. Every listening smoltcp socket that belongs to a reuseport listener - the primary socket, per-interface and backlog sockets, and the replacement socket created on accept - is marked with set_reuseport so the smoltcp dispatcher can distribute SYNs across the group. All unbind call sites now release by (iface_nic_id, handle).

mistcoversmyeyes · 2026-08-08T11:17:49Z

Related to

feat(net): implement SO_REUSEPORT for TCP stream sockets #1848

Replace the single-owner tcp_port_table (HashMap<u16, RawPid>) with multi-binding records mirroring the UDP side. A new binding is accepted when every conflicting binding shares SO_REUSEPORT or SO_REUSEADDR with the requester. Each record is identified by (iface_nic_id, smoltcp handle), so unbinding is exact without threading an extra id through the socket state. The generic bind_port/unbind_port/bind_ephemeral_port helpers are superseded by per-protocol variants.

Store the flag in TcpSocketOptions and wire it into setsockopt/getsockopt, mirroring the existing SO_REUSEADDR handling. The value is snapshotted at bind() time, matching Linux semantics where SO_REUSEPORT must be set before bind() to participate in port sharing.

Pass SO_REUSEPORT/SO_REUSEADDR from TcpSocket options into Init::bind and Init::listen, routing port registration through bind_tcp_port and bind_tcp_ephemeral_port. Every listening smoltcp socket that belongs to a reuseport listener - the primary socket, per-interface and backlog sockets, and the replacement socket created on accept - is marked with set_reuseport so the smoltcp dispatcher can distribute SYNs across the group. All unbind call sites now release by (iface_nic_id, handle).

github-actionsBot added the enhancement New feature or request label Aug 8, 2026