From b23b36e701c40827065217f4652a51eebc5f9913 Mon Sep 17 00:00:00 2001 From: Michael Pratt Date: Mon, 4 Nov 2019 10:06:00 -0800 Subject: Add NETLINK_KOBJECT_UEVENT socket support NETLINK_KOBJECT_UEVENT sockets send udev-style messages for device events. gVisor doesn't have any device events, so our sockets don't need to do anything once created. systemd's device manager needs to be able to create one of these sockets. It also wants to install a BPF filter on the socket. Since we'll never send any messages, the filter would never be invoked, thus we just fake it out. Fixes #1117 Updates #1119 PiperOrigin-RevId: 278405893 --- pkg/sentry/socket/netlink/provider.go | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'pkg/sentry/socket/netlink/provider.go') diff --git a/pkg/sentry/socket/netlink/provider.go b/pkg/sentry/socket/netlink/provider.go index 689cad997..be005df24 100644 --- a/pkg/sentry/socket/netlink/provider.go +++ b/pkg/sentry/socket/netlink/provider.go @@ -30,6 +30,13 @@ type Protocol interface { // Protocol returns the Linux netlink protocol value. Protocol() int + // CanSend returns true if this protocol may ever send messages. + // + // TODO(gvisor.dev/issue/1119): This is a workaround to allow + // advertising support for otherwise unimplemented features on sockets + // that will never send messages, thus making those features no-ops. + CanSend() bool + // ProcessMessage processes a single message from userspace. // // If err == nil, any messages added to ms will be sent back to the -- cgit v1.2.3