diff options
| author | Amanda Tait <atait@google.com> | 2019-02-20 12:53:07 -0800 |
|---|---|---|
| committer | Shentubot <shentubot@google.com> | 2019-02-20 12:54:13 -0800 |
| commit | ea070b9d5f4be0b25b028e90ab4518ef2e4df16b (patch) | |
| tree | 809aa3394d3b276cb5b37b4d72adf0f32e9248e1 /pkg/sentry/socket/epsocket/epsocket.go | |
| parent | 3e3a1ef9d61fccf6d0d9a52f4e885a6e07a07609 (diff) | |
Implement Broadcast support
This change adds support for the SO_BROADCAST socket option in gVisor Netstack.
This support includes getsockopt()/setsockopt() functionality for both UDP and
TCP endpoints (the latter being a NOOP), dispatching broadcast messages up and
down the stack, and route finding/creation for broadcast packets. Finally, a
suite of tests have been implemented, exercising this functionality through the
Linux syscall API.
PiperOrigin-RevId: 234850781
Change-Id: If3e666666917d39f55083741c78314a06defb26c
Diffstat (limited to 'pkg/sentry/socket/epsocket/epsocket.go')
| -rw-r--r-- | pkg/sentry/socket/epsocket/epsocket.go | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/pkg/sentry/socket/epsocket/epsocket.go b/pkg/sentry/socket/epsocket/epsocket.go index a97db5348..e24e58aed 100644 --- a/pkg/sentry/socket/epsocket/epsocket.go +++ b/pkg/sentry/socket/epsocket/epsocket.go @@ -582,6 +582,7 @@ func GetSockOpt(t *kernel.Task, s socket.Socket, ep commonEndpoint, family int, // getSockOptSocket implements GetSockOpt when level is SOL_SOCKET. func getSockOptSocket(t *kernel.Task, s socket.Socket, ep commonEndpoint, family int, skType transport.SockType, name, outLen int) (interface{}, *syserr.Error) { + // TODO: Stop rejecting short optLen values in getsockopt. switch name { case linux.SO_TYPE: if outLen < sizeOfInt32 { @@ -681,6 +682,18 @@ func getSockOptSocket(t *kernel.Task, s socket.Socket, ep commonEndpoint, family return int32(v), nil + case linux.SO_BROADCAST: + if outLen < sizeOfInt32 { + return nil, syserr.ErrInvalidArgument + } + + var v tcpip.BroadcastOption + if err := ep.GetSockOpt(&v); err != nil { + return nil, syserr.TranslateNetstackError(err) + } + + return int32(v), nil + case linux.SO_KEEPALIVE: if outLen < sizeOfInt32 { return nil, syserr.ErrInvalidArgument @@ -982,6 +995,14 @@ func setSockOptSocket(t *kernel.Task, s socket.Socket, ep commonEndpoint, name i v := usermem.ByteOrder.Uint32(optVal) return syserr.TranslateNetstackError(ep.SetSockOpt(tcpip.ReusePortOption(v))) + case linux.SO_BROADCAST: + if len(optVal) < sizeOfInt32 { + return syserr.ErrInvalidArgument + } + + v := usermem.ByteOrder.Uint32(optVal) + return syserr.TranslateNetstackError(ep.SetSockOpt(tcpip.BroadcastOption(v))) + case linux.SO_PASSCRED: if len(optVal) < sizeOfInt32 { return syserr.ErrInvalidArgument |