1 files changed, 0 insertions, 285 deletions
diff --git a/pkg/tcpip/link/sharedmem/sharedmem.go b/pkg/tcpip/link/sharedmem/sharedmem.go
deleted file mode 100644
index 279e2b457..000000000
--- a/pkg/tcpip/link/sharedmem/sharedmem.go
+++ /dev/null
@@ -1,285 +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.
-
-// +build linux
-
-// Package sharedmem provides the implemention of data-link layer endpoints
-// backed by shared memory.
-//
-// Shared memory endpoints can be used in the networking stack by calling New()
-// to create a new endpoint, and then passing it as an argument to
-// Stack.CreateNIC().
-package sharedmem
-
-import (
-	"sync"
-	"sync/atomic"
-	"syscall"
-
-	"gvisor.dev/gvisor/pkg/log"
-	"gvisor.dev/gvisor/pkg/tcpip"
-	"gvisor.dev/gvisor/pkg/tcpip/buffer"
-	"gvisor.dev/gvisor/pkg/tcpip/header"
-	"gvisor.dev/gvisor/pkg/tcpip/link/sharedmem/queue"
-	"gvisor.dev/gvisor/pkg/tcpip/stack"
-)
-
-// QueueConfig holds all the file descriptors needed to describe a tx or rx
-// queue over shared memory. It is used when creating new shared memory
-// endpoints to describe tx and rx queues.
-type QueueConfig struct {
-	// DataFD is a file descriptor for the file that contains the data to
-	// be transmitted via this queue. Descriptors contain offsets within
-	// this file.
-	DataFD int
-
-	// EventFD is a file descriptor for the event that is signaled when
-	// data is becomes available in this queue.
-	EventFD int
-
-	// TxPipeFD is a file descriptor for the tx pipe associated with the
-	// queue.
-	TxPipeFD int
-
-	// RxPipeFD is a file descriptor for the rx pipe associated with the
-	// queue.
-	RxPipeFD int
-
-	// SharedDataFD is a file descriptor for the file that contains shared
-	// state between the two ends of the queue. This data specifies, for
-	// example, whether EventFD signaling is enabled or disabled.
-	SharedDataFD int
-}
-
-type endpoint struct {
-	// mtu (maximum transmission unit) is the maximum size of a packet.
-	mtu uint32
-
-	// bufferSize is the size of each individual buffer.
-	bufferSize uint32
-
-	// addr is the local address of this endpoint.
-	addr tcpip.LinkAddress
-
-	// rx is the receive queue.
-	rx rx
-
-	// stopRequested is to be accessed atomically only, and determines if
-	// the worker goroutines should stop.
-	stopRequested uint32
-
-	// Wait group used to indicate that all workers have stopped.
-	completed sync.WaitGroup
-
-	// mu protects the following fields.
-	mu sync.Mutex
-
-	// tx is the transmit queue.
-	tx tx
-
-	// workerStarted specifies whether the worker goroutine was started.
-	workerStarted bool
-}
-
-// New creates a new shared-memory-based endpoint. Buffers will be broken up
-// into buffers of "bufferSize" bytes.
-func New(mtu, bufferSize uint32, addr tcpip.LinkAddress, tx, rx QueueConfig) (stack.LinkEndpoint, error) {
-	e := &endpoint{
-		mtu:        mtu,
-		bufferSize: bufferSize,
-		addr:       addr,
-	}
-
-	if err := e.tx.init(bufferSize, &tx); err != nil {
-		return nil, err
-	}
-
-	if err := e.rx.init(bufferSize, &rx); err != nil {
-		e.tx.cleanup()
-		return nil, err
-	}
-
-	return e, nil
-}
-
-// Close frees all resources associated with the endpoint.
-func (e *endpoint) Close() {
-	// Tell dispatch goroutine to stop, then write to the eventfd so that
-	// it wakes up in case it's sleeping.
-	atomic.StoreUint32(&e.stopRequested, 1)
-	syscall.Write(e.rx.eventFD, []byte{1, 0, 0, 0, 0, 0, 0, 0})
-
-	// Cleanup the queues inline if the worker hasn't started yet; we also
-	// know it won't start from now on because stopRequested is set to 1.
-	e.mu.Lock()
-	workerPresent := e.workerStarted
-	e.mu.Unlock()
-
-	if !workerPresent {
-		e.tx.cleanup()
-		e.rx.cleanup()
-	}
-}
-
-// Wait implements stack.LinkEndpoint.Wait. It waits until all workers have
-// stopped after a Close() call.
-func (e *endpoint) Wait() {
-	e.completed.Wait()
-}
-
-// Attach implements stack.LinkEndpoint.Attach. It launches the goroutine that
-// reads packets from the rx queue.
-func (e *endpoint) Attach(dispatcher stack.NetworkDispatcher) {
-	e.mu.Lock()
-	if !e.workerStarted && atomic.LoadUint32(&e.stopRequested) == 0 {
-		e.workerStarted = true
-		e.completed.Add(1)
-		// Link endpoints are not savable. When transportation endpoints
-		// are saved, they stop sending outgoing packets and all
-		// incoming packets are rejected.
-		go e.dispatchLoop(dispatcher) // S/R-SAFE: see above.
-	}
-	e.mu.Unlock()
-}
-
-// IsAttached implements stack.LinkEndpoint.IsAttached.
-func (e *endpoint) IsAttached() bool {
-	e.mu.Lock()
-	defer e.mu.Unlock()
-	return e.workerStarted
-}
-
-// MTU implements stack.LinkEndpoint.MTU. It returns the value initialized
-// during construction.
-func (e *endpoint) MTU() uint32 {
-	return e.mtu - header.EthernetMinimumSize
-}
-
-// Capabilities implements stack.LinkEndpoint.Capabilities.
-func (*endpoint) Capabilities() stack.LinkEndpointCapabilities {
-	return 0
-}
-
-// MaxHeaderLength implements stack.LinkEndpoint.MaxHeaderLength. It returns the
-// ethernet frame header size.
-func (*endpoint) MaxHeaderLength() uint16 {
-	return header.EthernetMinimumSize
-}
-
-// LinkAddress implements stack.LinkEndpoint.LinkAddress. It returns the local
-// link address.
-func (e *endpoint) LinkAddress() tcpip.LinkAddress {
-	return e.addr
-}
-
-// WritePacket writes outbound packets to the file descriptor. If it is not
-// currently writable, the packet is dropped.
-func (e *endpoint) WritePacket(r *stack.Route, _ *stack.GSO, hdr buffer.Prependable, payload buffer.VectorisedView, protocol tcpip.NetworkProtocolNumber) *tcpip.Error {
-	// Add the ethernet header here.
-	eth := header.Ethernet(hdr.Prepend(header.EthernetMinimumSize))
-	ethHdr := &header.EthernetFields{
-		DstAddr: r.RemoteLinkAddress,
-		Type:    protocol,
-	}
-	if r.LocalLinkAddress != "" {
-		ethHdr.SrcAddr = r.LocalLinkAddress
-	} else {
-		ethHdr.SrcAddr = e.addr
-	}
-	eth.Encode(ethHdr)
-
-	v := payload.ToView()
-	// Transmit the packet.
-	e.mu.Lock()
-	ok := e.tx.transmit(hdr.View(), v)
-	e.mu.Unlock()
-
-	if !ok {
-		return tcpip.ErrWouldBlock
-	}
-
-	return nil
-}
-
-// WritePackets implements stack.LinkEndpoint.WritePackets.
-func (e *endpoint) WritePackets(r *stack.Route, _ *stack.GSO, hdrs []stack.PacketDescriptor, payload buffer.VectorisedView, protocol tcpip.NetworkProtocolNumber) (int, *tcpip.Error) {
-	panic("not implemented")
-}
-
-// WriteRawPacket implements stack.LinkEndpoint.WriteRawPacket.
-func (e *endpoint) WriteRawPacket(packet buffer.VectorisedView) *tcpip.Error {
-	v := packet.ToView()
-	// Transmit the packet.
-	e.mu.Lock()
-	ok := e.tx.transmit(v, buffer.View{})
-	e.mu.Unlock()
-
-	if !ok {
-		return tcpip.ErrWouldBlock
-	}
-
-	return nil
-}
-
-// dispatchLoop reads packets from the rx queue in a loop and dispatches them
-// to the network stack.
-func (e *endpoint) dispatchLoop(d stack.NetworkDispatcher) {
-	// Post initial set of buffers.
-	limit := e.rx.q.PostedBuffersLimit()
-	if l := uint64(len(e.rx.data)) / uint64(e.bufferSize); limit > l {
-		limit = l
-	}
-	for i := uint64(0); i < limit; i++ {
-		b := queue.RxBuffer{
-			Offset: i * uint64(e.bufferSize),
-			Size:   e.bufferSize,
-			ID:     i,
-		}
-		if !e.rx.q.PostBuffers([]queue.RxBuffer{b}) {
-			log.Warningf("Unable to post %v-th buffer", i)
-		}
-	}
-
-	// Read in a loop until a stop is requested.
-	var rxb []queue.RxBuffer
-	for atomic.LoadUint32(&e.stopRequested) == 0 {
-		var n uint32
-		rxb, n = e.rx.postAndReceive(rxb, &e.stopRequested)
-
-		// Copy data from the shared area to its own buffer, then
-		// prepare to repost the buffer.
-		b := make([]byte, n)
-		offset := uint32(0)
-		for i := range rxb {
-			copy(b[offset:], e.rx.data[rxb[i].Offset:][:rxb[i].Size])
-			offset += rxb[i].Size
-
-			rxb[i].Size = e.bufferSize
-		}
-
-		if n < header.EthernetMinimumSize {
-			continue
-		}
-
-		// Send packet up the stack.
-		eth := header.Ethernet(b)
-		d.DeliverNetworkPacket(e, eth.SourceAddress(), eth.DestinationAddress(), eth.Type(), buffer.View(b[header.EthernetMinimumSize:]).ToVectorisedView(), buffer.View(eth))
-	}
-
-	// Clean state.
-	e.tx.cleanup()
-	e.rx.cleanup()
-
-	e.completed.Done()
-}