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Diffstat (limited to 'pkg/tcpip/link/waitable/waitable.go')
| -rw-r--r-- | pkg/tcpip/link/waitable/waitable.go | 149 |
1 files changed, 0 insertions, 149 deletions
diff --git a/pkg/tcpip/link/waitable/waitable.go b/pkg/tcpip/link/waitable/waitable.go deleted file mode 100644 index a04fc1062..000000000 --- a/pkg/tcpip/link/waitable/waitable.go +++ /dev/null @@ -1,149 +0,0 @@ -// Copyright 2018 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -// Package waitable provides the implementation of data-link layer endpoints -// that wrap other endpoints, and can wait for inflight calls to WritePacket or -// DeliverNetworkPacket to finish (and new ones to be prevented). -// -// Waitable endpoints can be used in the networking stack by calling New(eID) to -// create a new endpoint, where eID is the ID of the endpoint being wrapped, -// and then passing it as an argument to Stack.CreateNIC(). -package waitable - -import ( - "gvisor.dev/gvisor/pkg/gate" - "gvisor.dev/gvisor/pkg/tcpip" - "gvisor.dev/gvisor/pkg/tcpip/buffer" - "gvisor.dev/gvisor/pkg/tcpip/stack" -) - -// Endpoint is a waitable link-layer endpoint. -type Endpoint struct { - dispatchGate gate.Gate - dispatcher stack.NetworkDispatcher - - writeGate gate.Gate - lower stack.LinkEndpoint -} - -// New creates a new waitable link-layer endpoint. It wraps around another -// endpoint and allows the caller to block new write/dispatch calls and wait for -// the inflight ones to finish before returning. -func New(lower stack.LinkEndpoint) *Endpoint { - return &Endpoint{ - lower: lower, - } -} - -// DeliverNetworkPacket implements stack.NetworkDispatcher.DeliverNetworkPacket. -// It is called by the link-layer endpoint being wrapped when a packet arrives, -// and only forwards to the actual dispatcher if Wait or WaitDispatch haven't -// been called. -func (e *Endpoint) DeliverNetworkPacket(linkEP stack.LinkEndpoint, remote, local tcpip.LinkAddress, protocol tcpip.NetworkProtocolNumber, vv buffer.VectorisedView, linkHeader buffer.View) { - if !e.dispatchGate.Enter() { - return - } - - e.dispatcher.DeliverNetworkPacket(e, remote, local, protocol, vv, linkHeader) - e.dispatchGate.Leave() -} - -// Attach implements stack.LinkEndpoint.Attach. It saves the dispatcher and -// registers with the lower endpoint as its dispatcher so that "e" is called -// for inbound packets. -func (e *Endpoint) Attach(dispatcher stack.NetworkDispatcher) { - e.dispatcher = dispatcher - e.lower.Attach(e) -} - -// IsAttached implements stack.LinkEndpoint.IsAttached. -func (e *Endpoint) IsAttached() bool { - return e.dispatcher != nil -} - -// MTU implements stack.LinkEndpoint.MTU. It just forwards the request to the -// lower endpoint. -func (e *Endpoint) MTU() uint32 { - return e.lower.MTU() -} - -// Capabilities implements stack.LinkEndpoint.Capabilities. It just forwards the -// request to the lower endpoint. -func (e *Endpoint) Capabilities() stack.LinkEndpointCapabilities { - return e.lower.Capabilities() -} - -// MaxHeaderLength implements stack.LinkEndpoint.MaxHeaderLength. It just -// forwards the request to the lower endpoint. -func (e *Endpoint) MaxHeaderLength() uint16 { - return e.lower.MaxHeaderLength() -} - -// LinkAddress implements stack.LinkEndpoint.LinkAddress. It just forwards the -// request to the lower endpoint. -func (e *Endpoint) LinkAddress() tcpip.LinkAddress { - return e.lower.LinkAddress() -} - -// WritePacket implements stack.LinkEndpoint.WritePacket. It is called by -// higher-level protocols to write packets. It only forwards packets to the -// lower endpoint if Wait or WaitWrite haven't been called. -func (e *Endpoint) WritePacket(r *stack.Route, gso *stack.GSO, hdr buffer.Prependable, payload buffer.VectorisedView, protocol tcpip.NetworkProtocolNumber) *tcpip.Error { - if !e.writeGate.Enter() { - return nil - } - - err := e.lower.WritePacket(r, gso, hdr, payload, protocol) - e.writeGate.Leave() - return err -} - -// WritePackets implements stack.LinkEndpoint.WritePackets. It is called by -// higher-level protocols to write packets. It only forwards packets to the -// lower endpoint if Wait or WaitWrite haven't been called. -func (e *Endpoint) WritePackets(r *stack.Route, gso *stack.GSO, hdrs []stack.PacketDescriptor, payload buffer.VectorisedView, protocol tcpip.NetworkProtocolNumber) (int, *tcpip.Error) { - if !e.writeGate.Enter() { - return len(hdrs), nil - } - - n, err := e.lower.WritePackets(r, gso, hdrs, payload, protocol) - e.writeGate.Leave() - return n, err -} - -// WriteRawPacket implements stack.LinkEndpoint.WriteRawPacket. -func (e *Endpoint) WriteRawPacket(packet buffer.VectorisedView) *tcpip.Error { - if !e.writeGate.Enter() { - return nil - } - - err := e.lower.WriteRawPacket(packet) - e.writeGate.Leave() - return err -} - -// WaitWrite prevents new calls to WritePacket from reaching the lower endpoint, -// and waits for inflight ones to finish before returning. -func (e *Endpoint) WaitWrite() { - e.writeGate.Close() -} - -// WaitDispatch prevents new calls to DeliverNetworkPacket from reaching the -// actual dispatcher, and waits for inflight ones to finish before returning. -func (e *Endpoint) WaitDispatch() { - e.dispatchGate.Close() -} - -// Wait implements stack.LinkEndpoint.Wait. -func (e *Endpoint) Wait() {} |