diff options
Diffstat (limited to 'pkg/tcpip/socketops.go')
| -rw-r--r-- | pkg/tcpip/socketops.go | 285 |
1 files changed, 272 insertions, 13 deletions
diff --git a/pkg/tcpip/socketops.go b/pkg/tcpip/socketops.go index 2a6c7c7c0..c53698a6a 100644 --- a/pkg/tcpip/socketops.go +++ b/pkg/tcpip/socketops.go @@ -15,31 +15,290 @@ package tcpip import ( - "gvisor.dev/gvisor/pkg/sync" + "sync/atomic" ) -// SocketOptions contains all the variables which store values for socket -// level options. +// SocketOptionsHandler holds methods that help define endpoint specific +// behavior for socket level socket options. These must be implemented by +// endpoints to get notified when socket level options are set. +type SocketOptionsHandler interface { + // OnReuseAddressSet is invoked when SO_REUSEADDR is set for an endpoint. + OnReuseAddressSet(v bool) + + // OnReusePortSet is invoked when SO_REUSEPORT is set for an endpoint. + OnReusePortSet(v bool) + + // OnKeepAliveSet is invoked when SO_KEEPALIVE is set for an endpoint. + OnKeepAliveSet(v bool) + + // OnDelayOptionSet is invoked when TCP_NODELAY is set for an endpoint. + // Note that v will be the inverse of TCP_NODELAY option. + OnDelayOptionSet(v bool) + + // OnCorkOptionSet is invoked when TCP_CORK is set for an endpoint. + OnCorkOptionSet(v bool) +} + +// DefaultSocketOptionsHandler is an embeddable type that implements no-op +// implementations for SocketOptionsHandler methods. +type DefaultSocketOptionsHandler struct{} + +var _ SocketOptionsHandler = (*DefaultSocketOptionsHandler)(nil) + +// OnReuseAddressSet implements SocketOptionsHandler.OnReuseAddressSet. +func (*DefaultSocketOptionsHandler) OnReuseAddressSet(bool) {} + +// OnReusePortSet implements SocketOptionsHandler.OnReusePortSet. +func (*DefaultSocketOptionsHandler) OnReusePortSet(bool) {} + +// OnKeepAliveSet implements SocketOptionsHandler.OnKeepAliveSet. +func (*DefaultSocketOptionsHandler) OnKeepAliveSet(bool) {} + +// OnDelayOptionSet implements SocketOptionsHandler.OnDelayOptionSet. +func (*DefaultSocketOptionsHandler) OnDelayOptionSet(bool) {} + +// OnCorkOptionSet implements SocketOptionsHandler.OnCorkOptionSet. +func (*DefaultSocketOptionsHandler) OnCorkOptionSet(bool) {} + +// SocketOptions contains all the variables which store values for SOL_SOCKET, +// SOL_IP, SOL_IPV6 and SOL_TCP level options. // // +stateify savable type SocketOptions struct { - // mu protects fields below. - mu sync.Mutex `state:"nosave"` - broadcastEnabled bool + handler SocketOptionsHandler + + // These fields are accessed and modified using atomic operations. + + // broadcastEnabled determines whether datagram sockets are allowed to send + // packets to a broadcast address. + broadcastEnabled uint32 + + // passCredEnabled determines whether SCM_CREDENTIALS socket control messages + // are enabled. + passCredEnabled uint32 + + // noChecksumEnabled determines whether UDP checksum is disabled while + // transmitting for this socket. + noChecksumEnabled uint32 + + // reuseAddressEnabled determines whether Bind() should allow reuse of local + // address. + reuseAddressEnabled uint32 + + // reusePortEnabled determines whether to permit multiple sockets to be bound + // to an identical socket address. + reusePortEnabled uint32 + + // keepAliveEnabled determines whether TCP keepalive is enabled for this + // socket. + keepAliveEnabled uint32 + + // multicastLoopEnabled determines whether multicast packets sent over a + // non-loopback interface will be looped back. Analogous to inet->mc_loop. + multicastLoopEnabled uint32 + + // receiveTOSEnabled is used to specify if the TOS ancillary message is + // passed with incoming packets. + receiveTOSEnabled uint32 + + // receiveTClassEnabled is used to specify if the IPV6_TCLASS ancillary + // message is passed with incoming packets. + receiveTClassEnabled uint32 + + // receivePacketInfoEnabled is used to specify if more inforamtion is + // provided with incoming packets such as interface index and address. + receivePacketInfoEnabled uint32 + + // hdrIncludeEnabled is used to indicate for a raw endpoint that all packets + // being written have an IP header and the endpoint should not attach an IP + // header. + hdrIncludedEnabled uint32 + + // v6OnlyEnabled is used to determine whether an IPv6 socket is to be + // restricted to sending and receiving IPv6 packets only. + v6OnlyEnabled uint32 + + // quickAckEnabled is used to represent the value of TCP_QUICKACK option. + // It currently does not have any effect on the TCP endpoint. + quickAckEnabled uint32 + + // delayOptionEnabled is used to specify if data should be sent out immediately + // by the transport protocol. For TCP, it determines if the Nagle algorithm + // is on or off. + delayOptionEnabled uint32 + + // corkOptionEnabled is used to specify if data should be held until segments + // are full by the TCP transport protocol. + corkOptionEnabled uint32 +} + +// InitHandler initializes the handler. This must be called before using the +// socket options utility. +func (so *SocketOptions) InitHandler(handler SocketOptionsHandler) { + so.handler = handler +} + +func storeAtomicBool(addr *uint32, v bool) { + var val uint32 + if v { + val = 1 + } + atomic.StoreUint32(addr, val) } // GetBroadcast gets value for SO_BROADCAST option. func (so *SocketOptions) GetBroadcast() bool { - so.mu.Lock() - defer so.mu.Unlock() - - return so.broadcastEnabled + return atomic.LoadUint32(&so.broadcastEnabled) != 0 } // SetBroadcast sets value for SO_BROADCAST option. func (so *SocketOptions) SetBroadcast(v bool) { - so.mu.Lock() - defer so.mu.Unlock() + storeAtomicBool(&so.broadcastEnabled, v) +} + +// GetPassCred gets value for SO_PASSCRED option. +func (so *SocketOptions) GetPassCred() bool { + return atomic.LoadUint32(&so.passCredEnabled) != 0 +} + +// SetPassCred sets value for SO_PASSCRED option. +func (so *SocketOptions) SetPassCred(v bool) { + storeAtomicBool(&so.passCredEnabled, v) +} + +// GetNoChecksum gets value for SO_NO_CHECK option. +func (so *SocketOptions) GetNoChecksum() bool { + return atomic.LoadUint32(&so.noChecksumEnabled) != 0 +} + +// SetNoChecksum sets value for SO_NO_CHECK option. +func (so *SocketOptions) SetNoChecksum(v bool) { + storeAtomicBool(&so.noChecksumEnabled, v) +} + +// GetReuseAddress gets value for SO_REUSEADDR option. +func (so *SocketOptions) GetReuseAddress() bool { + return atomic.LoadUint32(&so.reuseAddressEnabled) != 0 +} + +// SetReuseAddress sets value for SO_REUSEADDR option. +func (so *SocketOptions) SetReuseAddress(v bool) { + storeAtomicBool(&so.reuseAddressEnabled, v) + so.handler.OnReuseAddressSet(v) +} + +// GetReusePort gets value for SO_REUSEPORT option. +func (so *SocketOptions) GetReusePort() bool { + return atomic.LoadUint32(&so.reusePortEnabled) != 0 +} + +// SetReusePort sets value for SO_REUSEPORT option. +func (so *SocketOptions) SetReusePort(v bool) { + storeAtomicBool(&so.reusePortEnabled, v) + so.handler.OnReusePortSet(v) +} + +// GetKeepAlive gets value for SO_KEEPALIVE option. +func (so *SocketOptions) GetKeepAlive() bool { + return atomic.LoadUint32(&so.keepAliveEnabled) != 0 +} + +// SetKeepAlive sets value for SO_KEEPALIVE option. +func (so *SocketOptions) SetKeepAlive(v bool) { + storeAtomicBool(&so.keepAliveEnabled, v) + so.handler.OnKeepAliveSet(v) +} + +// GetMulticastLoop gets value for IP_MULTICAST_LOOP option. +func (so *SocketOptions) GetMulticastLoop() bool { + return atomic.LoadUint32(&so.multicastLoopEnabled) != 0 +} + +// SetMulticastLoop sets value for IP_MULTICAST_LOOP option. +func (so *SocketOptions) SetMulticastLoop(v bool) { + storeAtomicBool(&so.multicastLoopEnabled, v) +} + +// GetReceiveTOS gets value for IP_RECVTOS option. +func (so *SocketOptions) GetReceiveTOS() bool { + return atomic.LoadUint32(&so.receiveTOSEnabled) != 0 +} + +// SetReceiveTOS sets value for IP_RECVTOS option. +func (so *SocketOptions) SetReceiveTOS(v bool) { + storeAtomicBool(&so.receiveTOSEnabled, v) +} + +// GetReceiveTClass gets value for IPV6_RECVTCLASS option. +func (so *SocketOptions) GetReceiveTClass() bool { + return atomic.LoadUint32(&so.receiveTClassEnabled) != 0 +} + +// SetReceiveTClass sets value for IPV6_RECVTCLASS option. +func (so *SocketOptions) SetReceiveTClass(v bool) { + storeAtomicBool(&so.receiveTClassEnabled, v) +} + +// GetReceivePacketInfo gets value for IP_PKTINFO option. +func (so *SocketOptions) GetReceivePacketInfo() bool { + return atomic.LoadUint32(&so.receivePacketInfoEnabled) != 0 +} + +// SetReceivePacketInfo sets value for IP_PKTINFO option. +func (so *SocketOptions) SetReceivePacketInfo(v bool) { + storeAtomicBool(&so.receivePacketInfoEnabled, v) +} + +// GetHeaderIncluded gets value for IP_HDRINCL option. +func (so *SocketOptions) GetHeaderIncluded() bool { + return atomic.LoadUint32(&so.hdrIncludedEnabled) != 0 +} + +// SetHeaderIncluded sets value for IP_HDRINCL option. +func (so *SocketOptions) SetHeaderIncluded(v bool) { + storeAtomicBool(&so.hdrIncludedEnabled, v) +} + +// GetV6Only gets value for IPV6_V6ONLY option. +func (so *SocketOptions) GetV6Only() bool { + return atomic.LoadUint32(&so.v6OnlyEnabled) != 0 +} + +// SetV6Only sets value for IPV6_V6ONLY option. +// +// Preconditions: the backing TCP or UDP endpoint must be in initial state. +func (so *SocketOptions) SetV6Only(v bool) { + storeAtomicBool(&so.v6OnlyEnabled, v) +} + +// GetQuickAck gets value for TCP_QUICKACK option. +func (so *SocketOptions) GetQuickAck() bool { + return atomic.LoadUint32(&so.quickAckEnabled) != 0 +} + +// SetQuickAck sets value for TCP_QUICKACK option. +func (so *SocketOptions) SetQuickAck(v bool) { + storeAtomicBool(&so.quickAckEnabled, v) +} + +// GetDelayOption gets inverted value for TCP_NODELAY option. +func (so *SocketOptions) GetDelayOption() bool { + return atomic.LoadUint32(&so.delayOptionEnabled) != 0 +} + +// SetDelayOption sets inverted value for TCP_NODELAY option. +func (so *SocketOptions) SetDelayOption(v bool) { + storeAtomicBool(&so.delayOptionEnabled, v) + so.handler.OnDelayOptionSet(v) +} + +// GetCorkOption gets value for TCP_CORK option. +func (so *SocketOptions) GetCorkOption() bool { + return atomic.LoadUint32(&so.corkOptionEnabled) != 0 +} - so.broadcastEnabled = v +// SetCorkOption sets value for TCP_CORK option. +func (so *SocketOptions) SetCorkOption(v bool) { + storeAtomicBool(&so.corkOptionEnabled, v) + so.handler.OnCorkOptionSet(v) } |