diff options
Diffstat (limited to 'pkg/tcpip/stack')
| -rw-r--r-- | pkg/tcpip/stack/nic.go | 2 | ||||
| -rw-r--r-- | pkg/tcpip/stack/registration.go | 19 | ||||
| -rw-r--r-- | pkg/tcpip/stack/stack.go | 29 | ||||
| -rw-r--r-- | pkg/tcpip/stack/transport_demuxer.go | 10 | ||||
| -rw-r--r-- | pkg/tcpip/stack/transport_test.go | 11 |
5 files changed, 67 insertions, 4 deletions
diff --git a/pkg/tcpip/stack/nic.go b/pkg/tcpip/stack/nic.go index a01a208b8..fe8f83d58 100644 --- a/pkg/tcpip/stack/nic.go +++ b/pkg/tcpip/stack/nic.go @@ -762,7 +762,7 @@ func (n *NIC) DeliverNetworkPacket(linkEP LinkEndpoint, remote, local tcpip.Link } n.mu.RUnlock() for _, ep := range packetEPs { - ep.HandlePacket(n.id, local, protocol, vv, linkHeader) + ep.HandlePacket(n.id, local, protocol, vv.Clone(nil), linkHeader) } if netProto.Number() == header.IPv4ProtocolNumber || netProto.Number() == header.IPv6ProtocolNumber { diff --git a/pkg/tcpip/stack/registration.go b/pkg/tcpip/stack/registration.go index 0360187b8..d7c124e81 100644 --- a/pkg/tcpip/stack/registration.go +++ b/pkg/tcpip/stack/registration.go @@ -60,12 +60,19 @@ const ( // TransportEndpoint is the interface that needs to be implemented by transport // protocol (e.g., tcp, udp) endpoints that can handle packets. type TransportEndpoint interface { + // UniqueID returns an unique ID for this transport endpoint. + UniqueID() uint64 + // HandlePacket is called by the stack when new packets arrive to // this transport endpoint. + // + // HandlePacket takes ownership of vv. HandlePacket(r *Route, id TransportEndpointID, vv buffer.VectorisedView) // HandleControlPacket is called by the stack when new control (e.g., // ICMP) packets arrive to this transport endpoint. + // + // HandleControlPacket takes ownership of vv. HandleControlPacket(id TransportEndpointID, typ ControlType, extra uint32, vv buffer.VectorisedView) // Close puts the endpoint in a closed state and frees all resources @@ -91,6 +98,8 @@ type RawTransportEndpoint interface { // HandlePacket is called by the stack when new packets arrive to // this transport endpoint. The packet contains all data from the link // layer up. + // + // HandlePacket takes ownership of packet and netHeader. HandlePacket(r *Route, netHeader buffer.View, packet buffer.VectorisedView) } @@ -107,6 +116,8 @@ type PacketEndpoint interface { // // linkHeader may have a length of 0, in which case the PacketEndpoint // should construct its own ethernet header for applications. + // + // HandlePacket takes ownership of packet and linkHeader. HandlePacket(nicid tcpip.NICID, addr tcpip.LinkAddress, netProto tcpip.NetworkProtocolNumber, packet buffer.VectorisedView, linkHeader buffer.View) } @@ -157,10 +168,14 @@ type TransportDispatcher interface { // DeliverTransportPacket delivers packets to the appropriate // transport protocol endpoint. It also returns the network layer // header for the enpoint to inspect or pass up the stack. + // + // DeliverTransportPacket takes ownership of vv and netHeader. DeliverTransportPacket(r *Route, protocol tcpip.TransportProtocolNumber, netHeader buffer.View, vv buffer.VectorisedView) // DeliverTransportControlPacket delivers control packets to the // appropriate transport protocol endpoint. + // + // DeliverTransportControlPacket takes ownership of vv. DeliverTransportControlPacket(local, remote tcpip.Address, net tcpip.NetworkProtocolNumber, trans tcpip.TransportProtocolNumber, typ ControlType, extra uint32, vv buffer.VectorisedView) } @@ -234,6 +249,8 @@ type NetworkEndpoint interface { // HandlePacket is called by the link layer when new packets arrive to // this network endpoint. + // + // HandlePacket takes ownership of vv. HandlePacket(r *Route, vv buffer.VectorisedView) // Close is called when the endpoint is reomved from a stack. @@ -279,6 +296,8 @@ type NetworkDispatcher interface { // DeliverNetworkPacket finds the appropriate network protocol endpoint // and hands the packet over for further processing. linkHeader may have // length 0 when the caller does not have ethernet data. + // + // DeliverNetworkPacket takes ownership of vv and linkHeader. DeliverNetworkPacket(linkEP LinkEndpoint, remote, local tcpip.LinkAddress, protocol tcpip.NetworkProtocolNumber, vv buffer.VectorisedView, linkHeader buffer.View) } diff --git a/pkg/tcpip/stack/stack.go b/pkg/tcpip/stack/stack.go index 6d6ddc0ff..115a6fcb8 100644 --- a/pkg/tcpip/stack/stack.go +++ b/pkg/tcpip/stack/stack.go @@ -22,6 +22,7 @@ package stack import ( "encoding/binary" "sync" + "sync/atomic" "time" "golang.org/x/time/rate" @@ -344,6 +345,13 @@ type ResumableEndpoint interface { Resume(*Stack) } +// uniqueIDGenerator is a default unique ID generator. +type uniqueIDGenerator uint64 + +func (u *uniqueIDGenerator) UniqueID() uint64 { + return atomic.AddUint64((*uint64)(u), 1) +} + // Stack is a networking stack, with all supported protocols, NICs, and route // table. type Stack struct { @@ -411,6 +419,14 @@ type Stack struct { // ndpDisp is the NDP event dispatcher that is used to send the netstack // integrator NDP related events. ndpDisp NDPDispatcher + + // uniqueIDGenerator is a generator of unique identifiers. + uniqueIDGenerator UniqueID +} + +// UniqueID is an abstract generator of unique identifiers. +type UniqueID interface { + UniqueID() uint64 } // Options contains optional Stack configuration. @@ -434,6 +450,9 @@ type Options struct { // stack (false). HandleLocal bool + // UniqueID is an optional generator of unique identifiers. + UniqueID UniqueID + // NDPConfigs is the default NDP configurations used by interfaces. // // By default, NDPConfigs will have a zero value for its @@ -506,6 +525,10 @@ func New(opts Options) *Stack { clock = &tcpip.StdClock{} } + if opts.UniqueID == nil { + opts.UniqueID = new(uniqueIDGenerator) + } + // Make sure opts.NDPConfigs contains valid values only. opts.NDPConfigs.validate() @@ -524,6 +547,7 @@ func New(opts Options) *Stack { portSeed: generateRandUint32(), ndpConfigs: opts.NDPConfigs, autoGenIPv6LinkLocal: opts.AutoGenIPv6LinkLocal, + uniqueIDGenerator: opts.UniqueID, ndpDisp: opts.NDPDisp, } @@ -551,6 +575,11 @@ func New(opts Options) *Stack { return s } +// UniqueID returns a unique identifier. +func (s *Stack) UniqueID() uint64 { + return s.uniqueIDGenerator.UniqueID() +} + // SetNetworkProtocolOption allows configuring individual protocol level // options. This method returns an error if the protocol is not supported or // option is not supported by the protocol implementation or the provided value diff --git a/pkg/tcpip/stack/transport_demuxer.go b/pkg/tcpip/stack/transport_demuxer.go index f633632f0..ccd3d030e 100644 --- a/pkg/tcpip/stack/transport_demuxer.go +++ b/pkg/tcpip/stack/transport_demuxer.go @@ -17,6 +17,7 @@ package stack import ( "fmt" "math/rand" + "sort" "sync" "gvisor.dev/gvisor/pkg/tcpip" @@ -310,6 +311,15 @@ func (ep *multiPortEndpoint) singleRegisterEndpoint(t TransportEndpoint, reusePo // endpointsMap. This will allow us to remove endpoint from the array fast. ep.endpointsMap[t] = len(ep.endpointsArr) ep.endpointsArr = append(ep.endpointsArr, t) + + // ep.endpointsArr is sorted by endpoint unique IDs, so that endpoints + // can be restored in the same order. + sort.Slice(ep.endpointsArr, func(i, j int) bool { + return ep.endpointsArr[i].UniqueID() < ep.endpointsArr[j].UniqueID() + }) + for i, e := range ep.endpointsArr { + ep.endpointsMap[e] = i + } return nil } diff --git a/pkg/tcpip/stack/transport_test.go b/pkg/tcpip/stack/transport_test.go index ae6fda3a9..203e79f56 100644 --- a/pkg/tcpip/stack/transport_test.go +++ b/pkg/tcpip/stack/transport_test.go @@ -43,6 +43,7 @@ type fakeTransportEndpoint struct { proto *fakeTransportProtocol peerAddr tcpip.Address route stack.Route + uniqueID uint64 // acceptQueue is non-nil iff bound. acceptQueue []fakeTransportEndpoint @@ -56,8 +57,8 @@ func (f *fakeTransportEndpoint) Stats() tcpip.EndpointStats { return nil } -func newFakeTransportEndpoint(s *stack.Stack, proto *fakeTransportProtocol, netProto tcpip.NetworkProtocolNumber) tcpip.Endpoint { - return &fakeTransportEndpoint{stack: s, TransportEndpointInfo: stack.TransportEndpointInfo{NetProto: netProto}, proto: proto} +func newFakeTransportEndpoint(s *stack.Stack, proto *fakeTransportProtocol, netProto tcpip.NetworkProtocolNumber, uniqueID uint64) tcpip.Endpoint { + return &fakeTransportEndpoint{stack: s, TransportEndpointInfo: stack.TransportEndpointInfo{NetProto: netProto}, proto: proto, uniqueID: uniqueID} } func (f *fakeTransportEndpoint) Close() { @@ -144,6 +145,10 @@ func (f *fakeTransportEndpoint) Connect(addr tcpip.FullAddress) *tcpip.Error { return nil } +func (f *fakeTransportEndpoint) UniqueID() uint64 { + return f.uniqueID +} + func (f *fakeTransportEndpoint) ConnectEndpoint(e tcpip.Endpoint) *tcpip.Error { return nil } @@ -251,7 +256,7 @@ func (*fakeTransportProtocol) Number() tcpip.TransportProtocolNumber { } func (f *fakeTransportProtocol) NewEndpoint(stack *stack.Stack, netProto tcpip.NetworkProtocolNumber, _ *waiter.Queue) (tcpip.Endpoint, *tcpip.Error) { - return newFakeTransportEndpoint(stack, f, netProto), nil + return newFakeTransportEndpoint(stack, f, netProto, stack.UniqueID()), nil } func (f *fakeTransportProtocol) NewRawEndpoint(stack *stack.Stack, netProto tcpip.NetworkProtocolNumber, _ *waiter.Queue) (tcpip.Endpoint, *tcpip.Error) { |