635 lines
19 KiB
Go
635 lines
19 KiB
Go
// Copyright 2020 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package tcpip
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import (
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"math"
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"sync/atomic"
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"gvisor.dev/gvisor/pkg/sync"
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)
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// PacketOverheadFactor is used to multiply the value provided by the user on a
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// SetSockOpt for setting the send/receive buffer sizes sockets.
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const PacketOverheadFactor = 2
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// SocketOptionsHandler holds methods that help define endpoint specific
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// behavior for socket level socket options. These must be implemented by
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// endpoints to get notified when socket level options are set.
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type SocketOptionsHandler interface {
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// OnReuseAddressSet is invoked when SO_REUSEADDR is set for an endpoint.
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OnReuseAddressSet(v bool)
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// OnReusePortSet is invoked when SO_REUSEPORT is set for an endpoint.
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OnReusePortSet(v bool)
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// OnKeepAliveSet is invoked when SO_KEEPALIVE is set for an endpoint.
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OnKeepAliveSet(v bool)
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// OnDelayOptionSet is invoked when TCP_NODELAY is set for an endpoint.
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// Note that v will be the inverse of TCP_NODELAY option.
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OnDelayOptionSet(v bool)
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// OnCorkOptionSet is invoked when TCP_CORK is set for an endpoint.
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OnCorkOptionSet(v bool)
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// LastError is invoked when SO_ERROR is read for an endpoint.
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LastError() Error
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// UpdateLastError updates the endpoint specific last error field.
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UpdateLastError(err Error)
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// HasNIC is invoked to check if the NIC is valid for SO_BINDTODEVICE.
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HasNIC(v int32) bool
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// OnSetSendBufferSize is invoked when the send buffer size for an endpoint is
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// changed. The handler is invoked with the new value for the socket send
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// buffer size. It also returns the newly set value.
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OnSetSendBufferSize(v int64) (newSz int64)
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}
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// DefaultSocketOptionsHandler is an embeddable type that implements no-op
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// implementations for SocketOptionsHandler methods.
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type DefaultSocketOptionsHandler struct{}
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var _ SocketOptionsHandler = (*DefaultSocketOptionsHandler)(nil)
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// OnReuseAddressSet implements SocketOptionsHandler.OnReuseAddressSet.
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func (*DefaultSocketOptionsHandler) OnReuseAddressSet(bool) {}
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// OnReusePortSet implements SocketOptionsHandler.OnReusePortSet.
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func (*DefaultSocketOptionsHandler) OnReusePortSet(bool) {}
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// OnKeepAliveSet implements SocketOptionsHandler.OnKeepAliveSet.
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func (*DefaultSocketOptionsHandler) OnKeepAliveSet(bool) {}
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// OnDelayOptionSet implements SocketOptionsHandler.OnDelayOptionSet.
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func (*DefaultSocketOptionsHandler) OnDelayOptionSet(bool) {}
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// OnCorkOptionSet implements SocketOptionsHandler.OnCorkOptionSet.
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func (*DefaultSocketOptionsHandler) OnCorkOptionSet(bool) {}
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// LastError implements SocketOptionsHandler.LastError.
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func (*DefaultSocketOptionsHandler) LastError() Error {
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return nil
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}
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// UpdateLastError implements SocketOptionsHandler.UpdateLastError.
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func (*DefaultSocketOptionsHandler) UpdateLastError(Error) {}
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// HasNIC implements SocketOptionsHandler.HasNIC.
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func (*DefaultSocketOptionsHandler) HasNIC(int32) bool {
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return false
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}
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// OnSetSendBufferSize implements SocketOptionsHandler.OnSetSendBufferSize.
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func (*DefaultSocketOptionsHandler) OnSetSendBufferSize(v int64) (newSz int64) {
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return v
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}
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// StackHandler holds methods to access the stack options. These must be
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// implemented by the stack.
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type StackHandler interface {
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// Option allows retrieving stack wide options.
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Option(option interface{}) Error
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// TransportProtocolOption allows retrieving individual protocol level
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// option values.
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TransportProtocolOption(proto TransportProtocolNumber, option GettableTransportProtocolOption) Error
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}
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// SocketOptions contains all the variables which store values for SOL_SOCKET,
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// SOL_IP, SOL_IPV6 and SOL_TCP level options.
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//
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// +stateify savable
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type SocketOptions struct {
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handler SocketOptionsHandler
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// StackHandler is initialized at the creation time and will not change.
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stackHandler StackHandler `state:"manual"`
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// These fields are accessed and modified using atomic operations.
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// broadcastEnabled determines whether datagram sockets are allowed to
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// send packets to a broadcast address.
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broadcastEnabled uint32
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// passCredEnabled determines whether SCM_CREDENTIALS socket control
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// messages are enabled.
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passCredEnabled uint32
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// noChecksumEnabled determines whether UDP checksum is disabled while
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// transmitting for this socket.
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noChecksumEnabled uint32
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// reuseAddressEnabled determines whether Bind() should allow reuse of
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// local address.
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reuseAddressEnabled uint32
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// reusePortEnabled determines whether to permit multiple sockets to be
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// bound to an identical socket address.
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reusePortEnabled uint32
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// keepAliveEnabled determines whether TCP keepalive is enabled for this
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// socket.
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keepAliveEnabled uint32
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// multicastLoopEnabled determines whether multicast packets sent over a
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// non-loopback interface will be looped back.
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multicastLoopEnabled uint32
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// receiveTOSEnabled is used to specify if the TOS ancillary message is
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// passed with incoming packets.
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receiveTOSEnabled uint32
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// receiveTClassEnabled is used to specify if the IPV6_TCLASS ancillary
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// message is passed with incoming packets.
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receiveTClassEnabled uint32
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// receivePacketInfoEnabled is used to specify if more inforamtion is
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// provided with incoming packets such as interface index and address.
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receivePacketInfoEnabled uint32
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// hdrIncludeEnabled is used to indicate for a raw endpoint that all packets
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// being written have an IP header and the endpoint should not attach an IP
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// header.
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hdrIncludedEnabled uint32
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// v6OnlyEnabled is used to determine whether an IPv6 socket is to be
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// restricted to sending and receiving IPv6 packets only.
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v6OnlyEnabled uint32
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// quickAckEnabled is used to represent the value of TCP_QUICKACK option.
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// It currently does not have any effect on the TCP endpoint.
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quickAckEnabled uint32
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// delayOptionEnabled is used to specify if data should be sent out immediately
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// by the transport protocol. For TCP, it determines if the Nagle algorithm
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// is on or off.
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delayOptionEnabled uint32
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// corkOptionEnabled is used to specify if data should be held until segments
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// are full by the TCP transport protocol.
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corkOptionEnabled uint32
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// receiveOriginalDstAddress is used to specify if the original destination of
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// the incoming packet should be returned as an ancillary message.
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receiveOriginalDstAddress uint32
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// recvErrEnabled determines whether extended reliable error message passing
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// is enabled.
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recvErrEnabled uint32
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// errQueue is the per-socket error queue. It is protected by errQueueMu.
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errQueueMu sync.Mutex `state:"nosave"`
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errQueue sockErrorList
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// bindToDevice determines the device to which the socket is bound.
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bindToDevice int32
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// getSendBufferLimits provides the handler to get the min, default and
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// max size for send buffer. It is initialized at the creation time and
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// will not change.
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getSendBufferLimits GetSendBufferLimits `state:"manual"`
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// sendBufferSize determines the send buffer size for this socket.
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sendBufferSize int64
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// mu protects the access to the below fields.
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mu sync.Mutex `state:"nosave"`
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// linger determines the amount of time the socket should linger before
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// close. We currently implement this option for TCP socket only.
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linger LingerOption
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}
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// InitHandler initializes the handler. This must be called before using the
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// socket options utility.
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func (so *SocketOptions) InitHandler(handler SocketOptionsHandler, stack StackHandler, getSendBufferLimits GetSendBufferLimits) {
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so.handler = handler
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so.stackHandler = stack
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so.getSendBufferLimits = getSendBufferLimits
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}
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func storeAtomicBool(addr *uint32, v bool) {
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var val uint32
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if v {
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val = 1
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}
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atomic.StoreUint32(addr, val)
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}
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// SetLastError sets the last error for a socket.
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func (so *SocketOptions) SetLastError(err Error) {
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so.handler.UpdateLastError(err)
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}
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// GetBroadcast gets value for SO_BROADCAST option.
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func (so *SocketOptions) GetBroadcast() bool {
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return atomic.LoadUint32(&so.broadcastEnabled) != 0
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}
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// SetBroadcast sets value for SO_BROADCAST option.
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func (so *SocketOptions) SetBroadcast(v bool) {
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storeAtomicBool(&so.broadcastEnabled, v)
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}
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// GetPassCred gets value for SO_PASSCRED option.
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func (so *SocketOptions) GetPassCred() bool {
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return atomic.LoadUint32(&so.passCredEnabled) != 0
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}
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// SetPassCred sets value for SO_PASSCRED option.
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func (so *SocketOptions) SetPassCred(v bool) {
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storeAtomicBool(&so.passCredEnabled, v)
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}
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// GetNoChecksum gets value for SO_NO_CHECK option.
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func (so *SocketOptions) GetNoChecksum() bool {
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return atomic.LoadUint32(&so.noChecksumEnabled) != 0
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}
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// SetNoChecksum sets value for SO_NO_CHECK option.
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func (so *SocketOptions) SetNoChecksum(v bool) {
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storeAtomicBool(&so.noChecksumEnabled, v)
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}
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// GetReuseAddress gets value for SO_REUSEADDR option.
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func (so *SocketOptions) GetReuseAddress() bool {
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return atomic.LoadUint32(&so.reuseAddressEnabled) != 0
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}
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// SetReuseAddress sets value for SO_REUSEADDR option.
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func (so *SocketOptions) SetReuseAddress(v bool) {
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storeAtomicBool(&so.reuseAddressEnabled, v)
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so.handler.OnReuseAddressSet(v)
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}
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// GetReusePort gets value for SO_REUSEPORT option.
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func (so *SocketOptions) GetReusePort() bool {
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return atomic.LoadUint32(&so.reusePortEnabled) != 0
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}
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// SetReusePort sets value for SO_REUSEPORT option.
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func (so *SocketOptions) SetReusePort(v bool) {
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storeAtomicBool(&so.reusePortEnabled, v)
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so.handler.OnReusePortSet(v)
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}
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// GetKeepAlive gets value for SO_KEEPALIVE option.
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func (so *SocketOptions) GetKeepAlive() bool {
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return atomic.LoadUint32(&so.keepAliveEnabled) != 0
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}
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// SetKeepAlive sets value for SO_KEEPALIVE option.
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func (so *SocketOptions) SetKeepAlive(v bool) {
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storeAtomicBool(&so.keepAliveEnabled, v)
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so.handler.OnKeepAliveSet(v)
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}
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// GetMulticastLoop gets value for IP_MULTICAST_LOOP option.
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func (so *SocketOptions) GetMulticastLoop() bool {
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return atomic.LoadUint32(&so.multicastLoopEnabled) != 0
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}
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// SetMulticastLoop sets value for IP_MULTICAST_LOOP option.
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func (so *SocketOptions) SetMulticastLoop(v bool) {
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storeAtomicBool(&so.multicastLoopEnabled, v)
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}
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// GetReceiveTOS gets value for IP_RECVTOS option.
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func (so *SocketOptions) GetReceiveTOS() bool {
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return atomic.LoadUint32(&so.receiveTOSEnabled) != 0
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}
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// SetReceiveTOS sets value for IP_RECVTOS option.
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func (so *SocketOptions) SetReceiveTOS(v bool) {
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storeAtomicBool(&so.receiveTOSEnabled, v)
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}
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// GetReceiveTClass gets value for IPV6_RECVTCLASS option.
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func (so *SocketOptions) GetReceiveTClass() bool {
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return atomic.LoadUint32(&so.receiveTClassEnabled) != 0
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}
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// SetReceiveTClass sets value for IPV6_RECVTCLASS option.
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func (so *SocketOptions) SetReceiveTClass(v bool) {
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storeAtomicBool(&so.receiveTClassEnabled, v)
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}
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// GetReceivePacketInfo gets value for IP_PKTINFO option.
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func (so *SocketOptions) GetReceivePacketInfo() bool {
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return atomic.LoadUint32(&so.receivePacketInfoEnabled) != 0
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}
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// SetReceivePacketInfo sets value for IP_PKTINFO option.
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func (so *SocketOptions) SetReceivePacketInfo(v bool) {
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storeAtomicBool(&so.receivePacketInfoEnabled, v)
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}
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// GetHeaderIncluded gets value for IP_HDRINCL option.
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func (so *SocketOptions) GetHeaderIncluded() bool {
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return atomic.LoadUint32(&so.hdrIncludedEnabled) != 0
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}
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// SetHeaderIncluded sets value for IP_HDRINCL option.
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func (so *SocketOptions) SetHeaderIncluded(v bool) {
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storeAtomicBool(&so.hdrIncludedEnabled, v)
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}
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// GetV6Only gets value for IPV6_V6ONLY option.
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func (so *SocketOptions) GetV6Only() bool {
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return atomic.LoadUint32(&so.v6OnlyEnabled) != 0
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}
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// SetV6Only sets value for IPV6_V6ONLY option.
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//
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// Preconditions: the backing TCP or UDP endpoint must be in initial state.
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func (so *SocketOptions) SetV6Only(v bool) {
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storeAtomicBool(&so.v6OnlyEnabled, v)
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}
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// GetQuickAck gets value for TCP_QUICKACK option.
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func (so *SocketOptions) GetQuickAck() bool {
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return atomic.LoadUint32(&so.quickAckEnabled) != 0
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}
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// SetQuickAck sets value for TCP_QUICKACK option.
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func (so *SocketOptions) SetQuickAck(v bool) {
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storeAtomicBool(&so.quickAckEnabled, v)
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}
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// GetDelayOption gets inverted value for TCP_NODELAY option.
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func (so *SocketOptions) GetDelayOption() bool {
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return atomic.LoadUint32(&so.delayOptionEnabled) != 0
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}
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// SetDelayOption sets inverted value for TCP_NODELAY option.
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func (so *SocketOptions) SetDelayOption(v bool) {
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storeAtomicBool(&so.delayOptionEnabled, v)
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so.handler.OnDelayOptionSet(v)
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}
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// GetCorkOption gets value for TCP_CORK option.
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func (so *SocketOptions) GetCorkOption() bool {
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return atomic.LoadUint32(&so.corkOptionEnabled) != 0
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}
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// SetCorkOption sets value for TCP_CORK option.
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func (so *SocketOptions) SetCorkOption(v bool) {
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storeAtomicBool(&so.corkOptionEnabled, v)
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so.handler.OnCorkOptionSet(v)
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}
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// GetReceiveOriginalDstAddress gets value for IP(V6)_RECVORIGDSTADDR option.
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func (so *SocketOptions) GetReceiveOriginalDstAddress() bool {
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return atomic.LoadUint32(&so.receiveOriginalDstAddress) != 0
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}
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// SetReceiveOriginalDstAddress sets value for IP(V6)_RECVORIGDSTADDR option.
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func (so *SocketOptions) SetReceiveOriginalDstAddress(v bool) {
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storeAtomicBool(&so.receiveOriginalDstAddress, v)
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}
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// GetRecvError gets value for IP*_RECVERR option.
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func (so *SocketOptions) GetRecvError() bool {
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return atomic.LoadUint32(&so.recvErrEnabled) != 0
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}
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// SetRecvError sets value for IP*_RECVERR option.
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func (so *SocketOptions) SetRecvError(v bool) {
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storeAtomicBool(&so.recvErrEnabled, v)
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if !v {
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so.pruneErrQueue()
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}
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}
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// GetLastError gets value for SO_ERROR option.
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func (so *SocketOptions) GetLastError() Error {
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return so.handler.LastError()
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}
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// GetOutOfBandInline gets value for SO_OOBINLINE option.
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func (*SocketOptions) GetOutOfBandInline() bool {
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return true
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}
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// SetOutOfBandInline sets value for SO_OOBINLINE option. We currently do not
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// support disabling this option.
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func (*SocketOptions) SetOutOfBandInline(bool) {}
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// GetLinger gets value for SO_LINGER option.
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func (so *SocketOptions) GetLinger() LingerOption {
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so.mu.Lock()
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linger := so.linger
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so.mu.Unlock()
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return linger
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}
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// SetLinger sets value for SO_LINGER option.
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func (so *SocketOptions) SetLinger(linger LingerOption) {
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so.mu.Lock()
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so.linger = linger
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so.mu.Unlock()
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}
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// SockErrOrigin represents the constants for error origin.
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type SockErrOrigin uint8
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const (
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// SockExtErrorOriginNone represents an unknown error origin.
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SockExtErrorOriginNone SockErrOrigin = iota
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// SockExtErrorOriginLocal indicates a local error.
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SockExtErrorOriginLocal
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// SockExtErrorOriginICMP indicates an IPv4 ICMP error.
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SockExtErrorOriginICMP
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// SockExtErrorOriginICMP6 indicates an IPv6 ICMP error.
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SockExtErrorOriginICMP6
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)
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// IsICMPErr indicates if the error originated from an ICMP error.
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func (origin SockErrOrigin) IsICMPErr() bool {
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return origin == SockExtErrorOriginICMP || origin == SockExtErrorOriginICMP6
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}
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// SockErrorCause is the cause of a socket error.
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type SockErrorCause interface {
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// Origin is the source of the error.
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Origin() SockErrOrigin
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// Type is the origin specific type of error.
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Type() uint8
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// Code is the origin and type specific error code.
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Code() uint8
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// Info is any extra information about the error.
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Info() uint32
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}
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// LocalSockError is a socket error that originated from the local host.
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//
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// +stateify savable
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type LocalSockError struct {
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info uint32
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}
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// Origin implements SockErrorCause.
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func (*LocalSockError) Origin() SockErrOrigin {
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return SockExtErrorOriginLocal
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}
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// Type implements SockErrorCause.
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func (*LocalSockError) Type() uint8 {
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return 0
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}
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// Code implements SockErrorCause.
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func (*LocalSockError) Code() uint8 {
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return 0
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}
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// Info implements SockErrorCause.
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func (l *LocalSockError) Info() uint32 {
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return l.info
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}
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// SockError represents a queue entry in the per-socket error queue.
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//
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// +stateify savable
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type SockError struct {
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sockErrorEntry
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// Err is the error caused by the errant packet.
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Err Error
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// Cause is the detailed cause of the error.
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Cause SockErrorCause
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// Payload is the errant packet's payload.
|
|
Payload []byte
|
|
// Dst is the original destination address of the errant packet.
|
|
Dst FullAddress
|
|
// Offender is the original sender address of the errant packet.
|
|
Offender FullAddress
|
|
// NetProto is the network protocol being used to transmit the packet.
|
|
NetProto NetworkProtocolNumber
|
|
}
|
|
|
|
// pruneErrQueue resets the queue.
|
|
func (so *SocketOptions) pruneErrQueue() {
|
|
so.errQueueMu.Lock()
|
|
so.errQueue.Reset()
|
|
so.errQueueMu.Unlock()
|
|
}
|
|
|
|
// DequeueErr dequeues a socket extended error from the error queue and returns
|
|
// it. Returns nil if queue is empty.
|
|
func (so *SocketOptions) DequeueErr() *SockError {
|
|
so.errQueueMu.Lock()
|
|
defer so.errQueueMu.Unlock()
|
|
|
|
err := so.errQueue.Front()
|
|
if err != nil {
|
|
so.errQueue.Remove(err)
|
|
}
|
|
return err
|
|
}
|
|
|
|
// PeekErr returns the error in the front of the error queue. Returns nil if
|
|
// the error queue is empty.
|
|
func (so *SocketOptions) PeekErr() *SockError {
|
|
so.errQueueMu.Lock()
|
|
defer so.errQueueMu.Unlock()
|
|
return so.errQueue.Front()
|
|
}
|
|
|
|
// QueueErr inserts the error at the back of the error queue.
|
|
//
|
|
// Preconditions: so.GetRecvError() == true.
|
|
func (so *SocketOptions) QueueErr(err *SockError) {
|
|
so.errQueueMu.Lock()
|
|
defer so.errQueueMu.Unlock()
|
|
so.errQueue.PushBack(err)
|
|
}
|
|
|
|
// QueueLocalErr queues a local error onto the local queue.
|
|
func (so *SocketOptions) QueueLocalErr(err Error, net NetworkProtocolNumber, info uint32, dst FullAddress, payload []byte) {
|
|
so.QueueErr(&SockError{
|
|
Err: err,
|
|
Cause: &LocalSockError{info: info},
|
|
Payload: payload,
|
|
Dst: dst,
|
|
NetProto: net,
|
|
})
|
|
}
|
|
|
|
// GetBindToDevice gets value for SO_BINDTODEVICE option.
|
|
func (so *SocketOptions) GetBindToDevice() int32 {
|
|
return atomic.LoadInt32(&so.bindToDevice)
|
|
}
|
|
|
|
// SetBindToDevice sets value for SO_BINDTODEVICE option.
|
|
func (so *SocketOptions) SetBindToDevice(bindToDevice int32) Error {
|
|
if !so.handler.HasNIC(bindToDevice) {
|
|
return &ErrUnknownDevice{}
|
|
}
|
|
|
|
atomic.StoreInt32(&so.bindToDevice, bindToDevice)
|
|
return nil
|
|
}
|
|
|
|
// GetSendBufferSize gets value for SO_SNDBUF option.
|
|
func (so *SocketOptions) GetSendBufferSize() int64 {
|
|
return atomic.LoadInt64(&so.sendBufferSize)
|
|
}
|
|
|
|
// SetSendBufferSize sets value for SO_SNDBUF option. notify indicates if the
|
|
// stack handler should be invoked to set the send buffer size.
|
|
func (so *SocketOptions) SetSendBufferSize(sendBufferSize int64, notify bool) {
|
|
v := sendBufferSize
|
|
|
|
if !notify {
|
|
atomic.StoreInt64(&so.sendBufferSize, v)
|
|
return
|
|
}
|
|
|
|
// Make sure the send buffer size is within the min and max
|
|
// allowed.
|
|
ss := so.getSendBufferLimits(so.stackHandler)
|
|
min := int64(ss.Min)
|
|
max := int64(ss.Max)
|
|
// Validate the send buffer size with min and max values.
|
|
// Multiply it by factor of 2.
|
|
if v > max {
|
|
v = max
|
|
}
|
|
|
|
if v < math.MaxInt32/PacketOverheadFactor {
|
|
v *= PacketOverheadFactor
|
|
if v < min {
|
|
v = min
|
|
}
|
|
} else {
|
|
v = math.MaxInt32
|
|
}
|
|
|
|
// Notify endpoint about change in buffer size.
|
|
newSz := so.handler.OnSetSendBufferSize(v)
|
|
atomic.StoreInt64(&so.sendBufferSize, newSz)
|
|
}
|