diff options
Diffstat (limited to 'pkg/tcpip/link/waitable')
| -rw-r--r-- | pkg/tcpip/link/waitable/BUILD | 33 | ||||
| -rw-r--r-- | pkg/tcpip/link/waitable/waitable.go | 122 | ||||
| -rw-r--r-- | pkg/tcpip/link/waitable/waitable_test.go | 159 |
3 files changed, 0 insertions, 314 deletions
diff --git a/pkg/tcpip/link/waitable/BUILD b/pkg/tcpip/link/waitable/BUILD deleted file mode 100644 index 2597d4b3e..000000000 --- a/pkg/tcpip/link/waitable/BUILD +++ /dev/null @@ -1,33 +0,0 @@ -load("//tools/go_stateify:defs.bzl", "go_library", "go_test") - -package(licenses = ["notice"]) - -go_library( - name = "waitable", - srcs = [ - "waitable.go", - ], - importpath = "gvisor.dev/gvisor/pkg/tcpip/link/waitable", - visibility = [ - "//visibility:public", - ], - deps = [ - "//pkg/gate", - "//pkg/tcpip", - "//pkg/tcpip/buffer", - "//pkg/tcpip/stack", - ], -) - -go_test( - name = "waitable_test", - srcs = [ - "waitable_test.go", - ], - embed = [":waitable"], - deps = [ - "//pkg/tcpip", - "//pkg/tcpip/buffer", - "//pkg/tcpip/stack", - ], -) diff --git a/pkg/tcpip/link/waitable/waitable.go b/pkg/tcpip/link/waitable/waitable.go deleted file mode 100644 index 408cc62f7..000000000 --- a/pkg/tcpip/link/waitable/waitable.go +++ /dev/null @@ -1,122 +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) { - if !e.dispatchGate.Enter() { - return - } - - e.dispatcher.DeliverNetworkPacket(e, remote, local, protocol, vv) - 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 -} - -// 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() -} diff --git a/pkg/tcpip/link/waitable/waitable_test.go b/pkg/tcpip/link/waitable/waitable_test.go deleted file mode 100644 index 1031438b1..000000000 --- a/pkg/tcpip/link/waitable/waitable_test.go +++ /dev/null @@ -1,159 +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 - -import ( - "testing" - - "gvisor.dev/gvisor/pkg/tcpip" - "gvisor.dev/gvisor/pkg/tcpip/buffer" - "gvisor.dev/gvisor/pkg/tcpip/stack" -) - -type countedEndpoint struct { - dispatchCount int - writeCount int - attachCount int - - mtu uint32 - capabilities stack.LinkEndpointCapabilities - hdrLen uint16 - linkAddr tcpip.LinkAddress - - dispatcher stack.NetworkDispatcher -} - -func (e *countedEndpoint) DeliverNetworkPacket(linkEP stack.LinkEndpoint, remote, local tcpip.LinkAddress, protocol tcpip.NetworkProtocolNumber, vv buffer.VectorisedView) { - e.dispatchCount++ -} - -func (e *countedEndpoint) Attach(dispatcher stack.NetworkDispatcher) { - e.attachCount++ - e.dispatcher = dispatcher -} - -// IsAttached implements stack.LinkEndpoint.IsAttached. -func (e *countedEndpoint) IsAttached() bool { - return e.dispatcher != nil -} - -func (e *countedEndpoint) MTU() uint32 { - return e.mtu -} - -func (e *countedEndpoint) Capabilities() stack.LinkEndpointCapabilities { - return e.capabilities -} - -func (e *countedEndpoint) MaxHeaderLength() uint16 { - return e.hdrLen -} - -func (e *countedEndpoint) LinkAddress() tcpip.LinkAddress { - return e.linkAddr -} - -func (e *countedEndpoint) WritePacket(r *stack.Route, _ *stack.GSO, hdr buffer.Prependable, payload buffer.VectorisedView, protocol tcpip.NetworkProtocolNumber) *tcpip.Error { - e.writeCount++ - return nil -} - -func TestWaitWrite(t *testing.T) { - ep := &countedEndpoint{} - wep := New(ep) - - // Write and check that it goes through. - wep.WritePacket(nil, nil /* gso */, buffer.Prependable{}, buffer.VectorisedView{}, 0) - if want := 1; ep.writeCount != want { - t.Fatalf("Unexpected writeCount: got=%v, want=%v", ep.writeCount, want) - } - - // Wait on dispatches, then try to write. It must go through. - wep.WaitDispatch() - wep.WritePacket(nil, nil /* gso */, buffer.Prependable{}, buffer.VectorisedView{}, 0) - if want := 2; ep.writeCount != want { - t.Fatalf("Unexpected writeCount: got=%v, want=%v", ep.writeCount, want) - } - - // Wait on writes, then try to write. It must not go through. - wep.WaitWrite() - wep.WritePacket(nil, nil /* gso */, buffer.Prependable{}, buffer.VectorisedView{}, 0) - if want := 2; ep.writeCount != want { - t.Fatalf("Unexpected writeCount: got=%v, want=%v", ep.writeCount, want) - } -} - -func TestWaitDispatch(t *testing.T) { - ep := &countedEndpoint{} - wep := New(ep) - - // Check that attach happens. - wep.Attach(ep) - if want := 1; ep.attachCount != want { - t.Fatalf("Unexpected attachCount: got=%v, want=%v", ep.attachCount, want) - } - - // Dispatch and check that it goes through. - ep.dispatcher.DeliverNetworkPacket(ep, "", "", 0, buffer.VectorisedView{}) - if want := 1; ep.dispatchCount != want { - t.Fatalf("Unexpected dispatchCount: got=%v, want=%v", ep.dispatchCount, want) - } - - // Wait on writes, then try to dispatch. It must go through. - wep.WaitWrite() - ep.dispatcher.DeliverNetworkPacket(ep, "", "", 0, buffer.VectorisedView{}) - if want := 2; ep.dispatchCount != want { - t.Fatalf("Unexpected dispatchCount: got=%v, want=%v", ep.dispatchCount, want) - } - - // Wait on dispatches, then try to dispatch. It must not go through. - wep.WaitDispatch() - ep.dispatcher.DeliverNetworkPacket(ep, "", "", 0, buffer.VectorisedView{}) - if want := 2; ep.dispatchCount != want { - t.Fatalf("Unexpected dispatchCount: got=%v, want=%v", ep.dispatchCount, want) - } -} - -func TestOtherMethods(t *testing.T) { - const ( - mtu = 0xdead - capabilities = 0xbeef - hdrLen = 0x1234 - linkAddr = "test address" - ) - ep := &countedEndpoint{ - mtu: mtu, - capabilities: capabilities, - hdrLen: hdrLen, - linkAddr: linkAddr, - } - wep := New(ep) - - if v := wep.MTU(); v != mtu { - t.Fatalf("Unexpected mtu: got=%v, want=%v", v, mtu) - } - - if v := wep.Capabilities(); v != capabilities { - t.Fatalf("Unexpected capabilities: got=%v, want=%v", v, capabilities) - } - - if v := wep.MaxHeaderLength(); v != hdrLen { - t.Fatalf("Unexpected MaxHeaderLength: got=%v, want=%v", v, hdrLen) - } - - if v := wep.LinkAddress(); v != linkAddr { - t.Fatalf("Unexpected LinkAddress: got=%q, want=%q", v, linkAddr) - } -} |