644 lines
18 KiB
Go
644 lines
18 KiB
Go
// Copyright 2019 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 raw provides the implementation of raw sockets (see raw(7)). Raw
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// sockets allow applications to:
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//
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// * manually write and inspect transport layer headers and payloads
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// * receive all traffic of a given transport protocol (e.g. ICMP or UDP)
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// * optionally write and inspect network layer headers of packets
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//
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// Raw sockets don't have any notion of ports, and incoming packets are
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// demultiplexed solely by protocol number. Thus, a raw UDP endpoint will
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// receive every UDP packet received by netstack. bind(2) and connect(2) can be
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// used to filter incoming packets by source and destination.
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package raw
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import (
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"sync"
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"gvisor.dev/gvisor/pkg/tcpip"
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"gvisor.dev/gvisor/pkg/tcpip/buffer"
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"gvisor.dev/gvisor/pkg/tcpip/header"
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"gvisor.dev/gvisor/pkg/tcpip/iptables"
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"gvisor.dev/gvisor/pkg/tcpip/stack"
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"gvisor.dev/gvisor/pkg/waiter"
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)
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// +stateify savable
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type rawPacket struct {
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rawPacketEntry
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// data holds the actual packet data, including any headers and
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// payload.
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data buffer.VectorisedView `state:".(buffer.VectorisedView)"`
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// timestampNS is the unix time at which the packet was received.
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timestampNS int64
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// senderAddr is the network address of the sender.
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senderAddr tcpip.FullAddress
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}
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// endpoint is the raw socket implementation of tcpip.Endpoint. It is legal to
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// have goroutines make concurrent calls into the endpoint.
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//
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// Lock order:
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// endpoint.mu
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// endpoint.rcvMu
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//
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// +stateify savable
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type endpoint struct {
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stack.TransportEndpointInfo
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// The following fields are initialized at creation time and are
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// immutable.
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stack *stack.Stack `state:"manual"`
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waiterQueue *waiter.Queue
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associated bool
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// The following fields are used to manage the receive queue and are
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// protected by rcvMu.
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rcvMu sync.Mutex `state:"nosave"`
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rcvList rawPacketList
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rcvBufSizeMax int `state:".(int)"`
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rcvBufSize int
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rcvClosed bool
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// The following fields are protected by mu.
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mu sync.RWMutex `state:"nosave"`
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sndBufSize int
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closed bool
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connected bool
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bound bool
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// route is the route to a remote network endpoint. It is set via
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// Connect(), and is valid only when conneted is true.
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route stack.Route `state:"manual"`
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stats tcpip.TransportEndpointStats `state:"nosave"`
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}
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// NewEndpoint returns a raw endpoint for the given protocols.
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func NewEndpoint(stack *stack.Stack, netProto tcpip.NetworkProtocolNumber, transProto tcpip.TransportProtocolNumber, waiterQueue *waiter.Queue) (tcpip.Endpoint, *tcpip.Error) {
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return newEndpoint(stack, netProto, transProto, waiterQueue, true /* associated */)
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}
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func newEndpoint(s *stack.Stack, netProto tcpip.NetworkProtocolNumber, transProto tcpip.TransportProtocolNumber, waiterQueue *waiter.Queue, associated bool) (tcpip.Endpoint, *tcpip.Error) {
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if netProto != header.IPv4ProtocolNumber {
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return nil, tcpip.ErrUnknownProtocol
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}
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e := &endpoint{
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stack: s,
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TransportEndpointInfo: stack.TransportEndpointInfo{
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NetProto: netProto,
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TransProto: transProto,
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},
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waiterQueue: waiterQueue,
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rcvBufSizeMax: 32 * 1024,
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sndBufSize: 32 * 1024,
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associated: associated,
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}
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// Unassociated endpoints are write-only and users call Write() with IP
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// headers included. Because they're write-only, We don't need to
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// register with the stack.
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if !associated {
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e.rcvBufSizeMax = 0
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e.waiterQueue = nil
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return e, nil
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}
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if err := e.stack.RegisterRawTransportEndpoint(e.RegisterNICID, e.NetProto, e.TransProto, e); err != nil {
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return nil, err
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}
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return e, nil
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}
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// Close implements tcpip.Endpoint.Close.
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func (e *endpoint) Close() {
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e.mu.Lock()
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defer e.mu.Unlock()
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if e.closed || !e.associated {
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return
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}
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e.stack.UnregisterRawTransportEndpoint(e.RegisterNICID, e.NetProto, e.TransProto, e)
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e.rcvMu.Lock()
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defer e.rcvMu.Unlock()
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// Clear the receive list.
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e.rcvClosed = true
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e.rcvBufSize = 0
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for !e.rcvList.Empty() {
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e.rcvList.Remove(e.rcvList.Front())
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}
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if e.connected {
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e.route.Release()
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e.connected = false
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}
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e.closed = true
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e.waiterQueue.Notify(waiter.EventHUp | waiter.EventErr | waiter.EventIn | waiter.EventOut)
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}
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// ModerateRecvBuf implements tcpip.Endpoint.ModerateRecvBuf.
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func (e *endpoint) ModerateRecvBuf(copied int) {}
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// IPTables implements tcpip.Endpoint.IPTables.
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func (e *endpoint) IPTables() (iptables.IPTables, error) {
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return e.stack.IPTables(), nil
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}
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// Read implements tcpip.Endpoint.Read.
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func (e *endpoint) Read(addr *tcpip.FullAddress) (buffer.View, tcpip.ControlMessages, *tcpip.Error) {
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if !e.associated {
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return buffer.View{}, tcpip.ControlMessages{}, tcpip.ErrInvalidOptionValue
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}
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e.rcvMu.Lock()
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// If there's no data to read, return that read would block or that the
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// endpoint is closed.
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if e.rcvList.Empty() {
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err := tcpip.ErrWouldBlock
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if e.rcvClosed {
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e.stats.ReadErrors.ReadClosed.Increment()
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err = tcpip.ErrClosedForReceive
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}
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e.rcvMu.Unlock()
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return buffer.View{}, tcpip.ControlMessages{}, err
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}
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pkt := e.rcvList.Front()
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e.rcvList.Remove(pkt)
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e.rcvBufSize -= pkt.data.Size()
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e.rcvMu.Unlock()
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if addr != nil {
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*addr = pkt.senderAddr
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}
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return pkt.data.ToView(), tcpip.ControlMessages{HasTimestamp: true, Timestamp: pkt.timestampNS}, nil
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}
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// Write implements tcpip.Endpoint.Write.
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func (e *endpoint) Write(p tcpip.Payloader, opts tcpip.WriteOptions) (int64, <-chan struct{}, *tcpip.Error) {
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n, ch, err := e.write(p, opts)
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switch err {
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case nil:
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e.stats.PacketsSent.Increment()
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case tcpip.ErrMessageTooLong, tcpip.ErrInvalidOptionValue:
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e.stats.WriteErrors.InvalidArgs.Increment()
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case tcpip.ErrClosedForSend:
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e.stats.WriteErrors.WriteClosed.Increment()
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case tcpip.ErrInvalidEndpointState:
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e.stats.WriteErrors.InvalidEndpointState.Increment()
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case tcpip.ErrNoLinkAddress:
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e.stats.SendErrors.NoLinkAddr.Increment()
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case tcpip.ErrNoRoute, tcpip.ErrBroadcastDisabled, tcpip.ErrNetworkUnreachable:
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// Errors indicating any problem with IP routing of the packet.
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e.stats.SendErrors.NoRoute.Increment()
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default:
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// For all other errors when writing to the network layer.
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e.stats.SendErrors.SendToNetworkFailed.Increment()
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}
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return n, ch, err
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}
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func (e *endpoint) write(p tcpip.Payloader, opts tcpip.WriteOptions) (int64, <-chan struct{}, *tcpip.Error) {
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// MSG_MORE is unimplemented. This also means that MSG_EOR is a no-op.
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if opts.More {
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return 0, nil, tcpip.ErrInvalidOptionValue
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}
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e.mu.RLock()
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if e.closed {
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e.mu.RUnlock()
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return 0, nil, tcpip.ErrInvalidEndpointState
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}
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payloadBytes, err := p.FullPayload()
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if err != nil {
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e.mu.RUnlock()
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return 0, nil, err
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}
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// If this is an unassociated socket and callee provided a nonzero
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// destination address, route using that address.
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if !e.associated {
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ip := header.IPv4(payloadBytes)
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if !ip.IsValid(len(payloadBytes)) {
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e.mu.RUnlock()
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return 0, nil, tcpip.ErrInvalidOptionValue
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}
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dstAddr := ip.DestinationAddress()
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// Update dstAddr with the address in the IP header, unless
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// opts.To is set (e.g. if sendto specifies a specific
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// address).
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if dstAddr != tcpip.Address([]byte{0, 0, 0, 0}) && opts.To == nil {
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opts.To = &tcpip.FullAddress{
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NIC: 0, // NIC is unset.
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Addr: dstAddr, // The address from the payload.
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Port: 0, // There are no ports here.
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}
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}
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}
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// Did the user caller provide a destination? If not, use the connected
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// destination.
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if opts.To == nil {
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// If the user doesn't specify a destination, they should have
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// connected to another address.
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if !e.connected {
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e.mu.RUnlock()
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return 0, nil, tcpip.ErrDestinationRequired
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}
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if e.route.IsResolutionRequired() {
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savedRoute := &e.route
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// Promote lock to exclusive if using a shared route,
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// given that it may need to change in finishWrite.
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e.mu.RUnlock()
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e.mu.Lock()
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// Make sure that the route didn't change during the
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// time we didn't hold the lock.
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if !e.connected || savedRoute != &e.route {
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e.mu.Unlock()
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return 0, nil, tcpip.ErrInvalidEndpointState
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}
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n, ch, err := e.finishWrite(payloadBytes, savedRoute)
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e.mu.Unlock()
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return n, ch, err
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}
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n, ch, err := e.finishWrite(payloadBytes, &e.route)
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e.mu.RUnlock()
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return n, ch, err
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}
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// The caller provided a destination. Reject destination address if it
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// goes through a different NIC than the endpoint was bound to.
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nic := opts.To.NIC
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if e.bound && nic != 0 && nic != e.BindNICID {
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e.mu.RUnlock()
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return 0, nil, tcpip.ErrNoRoute
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}
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// We don't support IPv6 yet, so this has to be an IPv4 address.
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if len(opts.To.Addr) != header.IPv4AddressSize {
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e.mu.RUnlock()
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return 0, nil, tcpip.ErrInvalidEndpointState
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}
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// Find the route to the destination. If BindAddress is 0,
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// FindRoute will choose an appropriate source address.
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route, err := e.stack.FindRoute(nic, e.BindAddr, opts.To.Addr, e.NetProto, false)
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if err != nil {
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e.mu.RUnlock()
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return 0, nil, err
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}
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n, ch, err := e.finishWrite(payloadBytes, &route)
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route.Release()
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e.mu.RUnlock()
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return n, ch, err
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}
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// finishWrite writes the payload to a route. It resolves the route if
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// necessary. It's really just a helper to make defer unnecessary in Write.
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func (e *endpoint) finishWrite(payloadBytes []byte, route *stack.Route) (int64, <-chan struct{}, *tcpip.Error) {
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// We may need to resolve the route (match a link layer address to the
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// network address). If that requires blocking (e.g. to use ARP),
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// return a channel on which the caller can wait.
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if route.IsResolutionRequired() {
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if ch, err := route.Resolve(nil); err != nil {
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if err == tcpip.ErrWouldBlock {
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return 0, ch, tcpip.ErrNoLinkAddress
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}
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return 0, nil, err
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}
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}
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switch e.NetProto {
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case header.IPv4ProtocolNumber:
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if !e.associated {
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if err := route.WriteHeaderIncludedPacket(buffer.View(payloadBytes).ToVectorisedView()); err != nil {
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return 0, nil, err
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}
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break
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}
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hdr := buffer.NewPrependable(len(payloadBytes) + int(route.MaxHeaderLength()))
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if err := route.WritePacket(nil /* gso */, hdr, buffer.View(payloadBytes).ToVectorisedView(), stack.NetworkHeaderParams{Protocol: e.TransProto, TTL: route.DefaultTTL(), TOS: stack.DefaultTOS}); err != nil {
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return 0, nil, err
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}
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default:
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return 0, nil, tcpip.ErrUnknownProtocol
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}
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return int64(len(payloadBytes)), nil, nil
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}
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// Peek implements tcpip.Endpoint.Peek.
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func (e *endpoint) Peek([][]byte) (int64, tcpip.ControlMessages, *tcpip.Error) {
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return 0, tcpip.ControlMessages{}, nil
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}
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// Disconnect implements tcpip.Endpoint.Disconnect.
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func (*endpoint) Disconnect() *tcpip.Error {
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return tcpip.ErrNotSupported
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}
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// Connect implements tcpip.Endpoint.Connect.
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func (e *endpoint) Connect(addr tcpip.FullAddress) *tcpip.Error {
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e.mu.Lock()
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defer e.mu.Unlock()
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if e.closed {
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return tcpip.ErrInvalidEndpointState
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}
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// We don't support IPv6 yet.
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if len(addr.Addr) != header.IPv4AddressSize {
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return tcpip.ErrInvalidEndpointState
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}
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nic := addr.NIC
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if e.bound {
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if e.BindNICID == 0 {
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// If we're bound, but not to a specific NIC, the NIC
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// in addr will be used. Nothing to do here.
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} else if addr.NIC == 0 {
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// If we're bound to a specific NIC, but addr doesn't
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// specify a NIC, use the bound NIC.
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nic = e.BindNICID
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} else if addr.NIC != e.BindNICID {
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// We're bound and addr specifies a NIC. They must be
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// the same.
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return tcpip.ErrInvalidEndpointState
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}
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}
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// Find a route to the destination.
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route, err := e.stack.FindRoute(nic, tcpip.Address(""), addr.Addr, e.NetProto, false)
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if err != nil {
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return err
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}
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defer route.Release()
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if e.associated {
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// Re-register the endpoint with the appropriate NIC.
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if err := e.stack.RegisterRawTransportEndpoint(addr.NIC, e.NetProto, e.TransProto, e); err != nil {
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return err
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}
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e.stack.UnregisterRawTransportEndpoint(e.RegisterNICID, e.NetProto, e.TransProto, e)
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e.RegisterNICID = nic
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}
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// Save the route we've connected via.
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e.route = route.Clone()
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e.connected = true
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return nil
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}
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// Shutdown implements tcpip.Endpoint.Shutdown. It's a noop for raw sockets.
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func (e *endpoint) Shutdown(flags tcpip.ShutdownFlags) *tcpip.Error {
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e.mu.Lock()
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defer e.mu.Unlock()
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if !e.connected {
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return tcpip.ErrNotConnected
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}
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return nil
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}
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// Listen implements tcpip.Endpoint.Listen.
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func (e *endpoint) Listen(backlog int) *tcpip.Error {
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return tcpip.ErrNotSupported
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}
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// Accept implements tcpip.Endpoint.Accept.
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func (e *endpoint) Accept() (tcpip.Endpoint, *waiter.Queue, *tcpip.Error) {
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return nil, nil, tcpip.ErrNotSupported
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}
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// Bind implements tcpip.Endpoint.Bind.
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func (e *endpoint) Bind(addr tcpip.FullAddress) *tcpip.Error {
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e.mu.Lock()
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defer e.mu.Unlock()
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// Callers must provide an IPv4 address or no network address (for
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// binding to a NIC, but not an address).
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if len(addr.Addr) != 0 && len(addr.Addr) != 4 {
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return tcpip.ErrInvalidEndpointState
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}
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// If a local address was specified, verify that it's valid.
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if len(addr.Addr) == header.IPv4AddressSize && e.stack.CheckLocalAddress(addr.NIC, e.NetProto, addr.Addr) == 0 {
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return tcpip.ErrBadLocalAddress
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}
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if e.associated {
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// Re-register the endpoint with the appropriate NIC.
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if err := e.stack.RegisterRawTransportEndpoint(addr.NIC, e.NetProto, e.TransProto, e); err != nil {
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return err
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}
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e.stack.UnregisterRawTransportEndpoint(e.RegisterNICID, e.NetProto, e.TransProto, e)
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e.RegisterNICID = addr.NIC
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e.BindNICID = addr.NIC
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}
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e.BindAddr = addr.Addr
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e.bound = true
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return nil
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}
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// GetLocalAddress implements tcpip.Endpoint.GetLocalAddress.
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func (e *endpoint) GetLocalAddress() (tcpip.FullAddress, *tcpip.Error) {
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return tcpip.FullAddress{}, tcpip.ErrNotSupported
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}
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// GetRemoteAddress implements tcpip.Endpoint.GetRemoteAddress.
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func (e *endpoint) GetRemoteAddress() (tcpip.FullAddress, *tcpip.Error) {
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// Even a connected socket doesn't return a remote address.
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return tcpip.FullAddress{}, tcpip.ErrNotConnected
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}
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// Readiness implements tcpip.Endpoint.Readiness.
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func (e *endpoint) Readiness(mask waiter.EventMask) waiter.EventMask {
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// The endpoint is always writable.
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result := waiter.EventOut & mask
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// Determine whether the endpoint is readable.
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if (mask & waiter.EventIn) != 0 {
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e.rcvMu.Lock()
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if !e.rcvList.Empty() || e.rcvClosed {
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result |= waiter.EventIn
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}
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e.rcvMu.Unlock()
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}
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return result
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}
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// SetSockOpt implements tcpip.Endpoint.SetSockOpt.
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func (e *endpoint) SetSockOpt(opt interface{}) *tcpip.Error {
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return tcpip.ErrUnknownProtocolOption
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}
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// SetSockOptInt implements tcpip.Endpoint.SetSockOptInt.
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func (ep *endpoint) SetSockOptInt(opt tcpip.SockOpt, v int) *tcpip.Error {
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return tcpip.ErrUnknownProtocolOption
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}
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// GetSockOptInt implements tcpip.Endpoint.GetSockOptInt.
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|
func (e *endpoint) GetSockOptInt(opt tcpip.SockOpt) (int, *tcpip.Error) {
|
|
switch opt {
|
|
case tcpip.ReceiveQueueSizeOption:
|
|
v := 0
|
|
e.rcvMu.Lock()
|
|
if !e.rcvList.Empty() {
|
|
p := e.rcvList.Front()
|
|
v = p.data.Size()
|
|
}
|
|
e.rcvMu.Unlock()
|
|
return v, nil
|
|
|
|
case tcpip.SendBufferSizeOption:
|
|
e.mu.Lock()
|
|
v := e.sndBufSize
|
|
e.mu.Unlock()
|
|
return v, nil
|
|
|
|
case tcpip.ReceiveBufferSizeOption:
|
|
e.rcvMu.Lock()
|
|
v := e.rcvBufSizeMax
|
|
e.rcvMu.Unlock()
|
|
return v, nil
|
|
|
|
}
|
|
|
|
return -1, tcpip.ErrUnknownProtocolOption
|
|
}
|
|
|
|
// GetSockOpt implements tcpip.Endpoint.GetSockOpt.
|
|
func (e *endpoint) GetSockOpt(opt interface{}) *tcpip.Error {
|
|
switch o := opt.(type) {
|
|
case tcpip.ErrorOption:
|
|
return nil
|
|
|
|
case *tcpip.KeepaliveEnabledOption:
|
|
*o = 0
|
|
return nil
|
|
|
|
default:
|
|
return tcpip.ErrUnknownProtocolOption
|
|
}
|
|
}
|
|
|
|
// HandlePacket implements stack.RawTransportEndpoint.HandlePacket.
|
|
func (e *endpoint) HandlePacket(route *stack.Route, pkt tcpip.PacketBuffer) {
|
|
e.rcvMu.Lock()
|
|
|
|
// Drop the packet if our buffer is currently full.
|
|
if e.rcvClosed {
|
|
e.rcvMu.Unlock()
|
|
e.stack.Stats().DroppedPackets.Increment()
|
|
e.stats.ReceiveErrors.ClosedReceiver.Increment()
|
|
return
|
|
}
|
|
|
|
if e.rcvBufSize >= e.rcvBufSizeMax {
|
|
e.rcvMu.Unlock()
|
|
e.stack.Stats().DroppedPackets.Increment()
|
|
e.stats.ReceiveErrors.ReceiveBufferOverflow.Increment()
|
|
return
|
|
}
|
|
|
|
if e.bound {
|
|
// If bound to a NIC, only accept data for that NIC.
|
|
if e.BindNICID != 0 && e.BindNICID != route.NICID() {
|
|
e.rcvMu.Unlock()
|
|
return
|
|
}
|
|
// If bound to an address, only accept data for that address.
|
|
if e.BindAddr != "" && e.BindAddr != route.RemoteAddress {
|
|
e.rcvMu.Unlock()
|
|
return
|
|
}
|
|
}
|
|
|
|
// If connected, only accept packets from the remote address we
|
|
// connected to.
|
|
if e.connected && e.route.RemoteAddress != route.RemoteAddress {
|
|
e.rcvMu.Unlock()
|
|
return
|
|
}
|
|
|
|
wasEmpty := e.rcvBufSize == 0
|
|
|
|
// Push new packet into receive list and increment the buffer size.
|
|
packet := &rawPacket{
|
|
senderAddr: tcpip.FullAddress{
|
|
NIC: route.NICID(),
|
|
Addr: route.RemoteAddress,
|
|
},
|
|
}
|
|
|
|
networkHeader := append(buffer.View(nil), pkt.NetworkHeader...)
|
|
combinedVV := networkHeader.ToVectorisedView()
|
|
combinedVV.Append(pkt.Data)
|
|
packet.data = combinedVV
|
|
packet.timestampNS = e.stack.NowNanoseconds()
|
|
|
|
e.rcvList.PushBack(packet)
|
|
e.rcvBufSize += packet.data.Size()
|
|
|
|
e.rcvMu.Unlock()
|
|
e.stats.PacketsReceived.Increment()
|
|
// Notify waiters that there's data to be read.
|
|
if wasEmpty {
|
|
e.waiterQueue.Notify(waiter.EventIn)
|
|
}
|
|
}
|
|
|
|
// State implements socket.Socket.State.
|
|
func (e *endpoint) State() uint32 {
|
|
return 0
|
|
}
|
|
|
|
// Info returns a copy of the endpoint info.
|
|
func (e *endpoint) Info() tcpip.EndpointInfo {
|
|
e.mu.RLock()
|
|
// Make a copy of the endpoint info.
|
|
ret := e.TransportEndpointInfo
|
|
e.mu.RUnlock()
|
|
return &ret
|
|
}
|
|
|
|
// Stats returns a pointer to the endpoint stats.
|
|
func (e *endpoint) Stats() tcpip.EndpointStats {
|
|
return &e.stats
|
|
}
|
|
|
|
// Wait implements stack.TransportEndpoint.Wait.
|
|
func (*endpoint) Wait() {}
|