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-rw-r--r--pkg/tcpip/link/channel/channel.go14
-rw-r--r--pkg/tcpip/link/ethernet/ethernet.go99
-rw-r--r--pkg/tcpip/link/ethernet/ethernet_state_autogen.go3
-rw-r--r--pkg/tcpip/link/pipe/pipe.go110
-rw-r--r--pkg/tcpip/link/pipe/pipe_state_autogen.go3
-rw-r--r--pkg/tcpip/link/qdisc/fifo/endpoint.go8
-rw-r--r--pkg/tcpip/link/qdisc/fifo/packet_buffer_queue.go1
-rw-r--r--pkg/tcpip/link/sniffer/sniffer.go2
-rw-r--r--pkg/tcpip/link/tun/device.go4
9 files changed, 223 insertions, 21 deletions
diff --git a/pkg/tcpip/link/channel/channel.go b/pkg/tcpip/link/channel/channel.go
index 0efbfb22b..d9f8e3b35 100644
--- a/pkg/tcpip/link/channel/channel.go
+++ b/pkg/tcpip/link/channel/channel.go
@@ -31,7 +31,7 @@ type PacketInfo struct {
Pkt *stack.PacketBuffer
Proto tcpip.NetworkProtocolNumber
GSO *stack.GSO
- Route *stack.Route
+ Route stack.RouteInfo
}
// Notification is the interface for receiving notification from the packet
@@ -230,15 +230,11 @@ func (e *Endpoint) LinkAddress() tcpip.LinkAddress {
// WritePacket stores outbound packets into the channel.
func (e *Endpoint) WritePacket(r *stack.Route, gso *stack.GSO, protocol tcpip.NetworkProtocolNumber, pkt *stack.PacketBuffer) *tcpip.Error {
- // Clone r then release its resource so we only get the relevant fields from
- // stack.Route without holding a reference to a NIC's endpoint.
- route := r.Clone()
- route.Release()
p := PacketInfo{
Pkt: pkt,
Proto: protocol,
GSO: gso,
- Route: route,
+ Route: r.GetFields(),
}
e.q.Write(p)
@@ -248,17 +244,13 @@ func (e *Endpoint) WritePacket(r *stack.Route, gso *stack.GSO, protocol tcpip.Ne
// WritePackets stores outbound packets into the channel.
func (e *Endpoint) WritePackets(r *stack.Route, gso *stack.GSO, pkts stack.PacketBufferList, protocol tcpip.NetworkProtocolNumber) (int, *tcpip.Error) {
- // Clone r then release its resource so we only get the relevant fields from
- // stack.Route without holding a reference to a NIC's endpoint.
- route := r.Clone()
- route.Release()
n := 0
for pkt := pkts.Front(); pkt != nil; pkt = pkt.Next() {
p := PacketInfo{
Pkt: pkt,
Proto: protocol,
GSO: gso,
- Route: route,
+ Route: r.GetFields(),
}
if !e.q.Write(p) {
diff --git a/pkg/tcpip/link/ethernet/ethernet.go b/pkg/tcpip/link/ethernet/ethernet.go
new file mode 100644
index 000000000..beefcd008
--- /dev/null
+++ b/pkg/tcpip/link/ethernet/ethernet.go
@@ -0,0 +1,99 @@
+// Copyright 2020 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 ethernet provides an implementation of an ethernet link endpoint that
+// wraps an inner link endpoint.
+package ethernet
+
+import (
+ "gvisor.dev/gvisor/pkg/tcpip"
+ "gvisor.dev/gvisor/pkg/tcpip/header"
+ "gvisor.dev/gvisor/pkg/tcpip/link/nested"
+ "gvisor.dev/gvisor/pkg/tcpip/stack"
+)
+
+var _ stack.NetworkDispatcher = (*Endpoint)(nil)
+var _ stack.LinkEndpoint = (*Endpoint)(nil)
+
+// New returns an ethernet link endpoint that wraps an inner link endpoint.
+func New(ep stack.LinkEndpoint) *Endpoint {
+ var e Endpoint
+ e.Endpoint.Init(ep, &e)
+ return &e
+}
+
+// Endpoint is an ethernet endpoint.
+//
+// It adds an ethernet header to packets before sending them out through its
+// inner link endpoint and consumes an ethernet header before sending the
+// packet to the stack.
+type Endpoint struct {
+ nested.Endpoint
+}
+
+// DeliverNetworkPacket implements stack.NetworkDispatcher.
+func (e *Endpoint) DeliverNetworkPacket(_, _ tcpip.LinkAddress, _ tcpip.NetworkProtocolNumber, pkt *stack.PacketBuffer) {
+ hdr, ok := pkt.LinkHeader().Consume(header.EthernetMinimumSize)
+ if !ok {
+ return
+ }
+
+ eth := header.Ethernet(hdr)
+ if dst := eth.DestinationAddress(); dst == e.Endpoint.LinkAddress() || dst == header.EthernetBroadcastAddress || header.IsMulticastEthernetAddress(dst) {
+ e.Endpoint.DeliverNetworkPacket(eth.SourceAddress() /* remote */, dst /* local */, eth.Type() /* protocol */, pkt)
+ }
+}
+
+// Capabilities implements stack.LinkEndpoint.
+func (e *Endpoint) Capabilities() stack.LinkEndpointCapabilities {
+ return stack.CapabilityResolutionRequired | e.Endpoint.Capabilities()
+}
+
+// WritePacket implements stack.LinkEndpoint.
+func (e *Endpoint) WritePacket(r *stack.Route, gso *stack.GSO, proto tcpip.NetworkProtocolNumber, pkt *stack.PacketBuffer) *tcpip.Error {
+ e.AddHeader(e.Endpoint.LinkAddress(), r.RemoteLinkAddress(), proto, pkt)
+ return e.Endpoint.WritePacket(r, gso, proto, pkt)
+}
+
+// WritePackets implements stack.LinkEndpoint.
+func (e *Endpoint) WritePackets(r *stack.Route, gso *stack.GSO, pkts stack.PacketBufferList, proto tcpip.NetworkProtocolNumber) (int, *tcpip.Error) {
+ linkAddr := e.Endpoint.LinkAddress()
+
+ for pkt := pkts.Front(); pkt != nil; pkt = pkt.Next() {
+ e.AddHeader(linkAddr, r.RemoteLinkAddress(), proto, pkt)
+ }
+
+ return e.Endpoint.WritePackets(r, gso, pkts, proto)
+}
+
+// MaxHeaderLength implements stack.LinkEndpoint.
+func (e *Endpoint) MaxHeaderLength() uint16 {
+ return header.EthernetMinimumSize + e.Endpoint.MaxHeaderLength()
+}
+
+// ARPHardwareType implements stack.LinkEndpoint.
+func (*Endpoint) ARPHardwareType() header.ARPHardwareType {
+ return header.ARPHardwareEther
+}
+
+// AddHeader implements stack.LinkEndpoint.
+func (*Endpoint) AddHeader(local, remote tcpip.LinkAddress, proto tcpip.NetworkProtocolNumber, pkt *stack.PacketBuffer) {
+ eth := header.Ethernet(pkt.LinkHeader().Push(header.EthernetMinimumSize))
+ fields := header.EthernetFields{
+ SrcAddr: local,
+ DstAddr: remote,
+ Type: proto,
+ }
+ eth.Encode(&fields)
+}
diff --git a/pkg/tcpip/link/ethernet/ethernet_state_autogen.go b/pkg/tcpip/link/ethernet/ethernet_state_autogen.go
new file mode 100644
index 000000000..71d255c20
--- /dev/null
+++ b/pkg/tcpip/link/ethernet/ethernet_state_autogen.go
@@ -0,0 +1,3 @@
+// automatically generated by stateify.
+
+package ethernet
diff --git a/pkg/tcpip/link/pipe/pipe.go b/pkg/tcpip/link/pipe/pipe.go
new file mode 100644
index 000000000..25c364391
--- /dev/null
+++ b/pkg/tcpip/link/pipe/pipe.go
@@ -0,0 +1,110 @@
+// Copyright 2020 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 pipe provides the implementation of pipe-like data-link layer
+// endpoints. Such endpoints allow packets to be sent between two interfaces.
+package pipe
+
+import (
+ "gvisor.dev/gvisor/pkg/tcpip"
+ "gvisor.dev/gvisor/pkg/tcpip/buffer"
+ "gvisor.dev/gvisor/pkg/tcpip/header"
+ "gvisor.dev/gvisor/pkg/tcpip/stack"
+)
+
+var _ stack.LinkEndpoint = (*Endpoint)(nil)
+
+// New returns both ends of a new pipe.
+func New(linkAddr1, linkAddr2 tcpip.LinkAddress) (*Endpoint, *Endpoint) {
+ ep1 := &Endpoint{
+ linkAddr: linkAddr1,
+ }
+ ep2 := &Endpoint{
+ linkAddr: linkAddr2,
+ }
+ ep1.linked = ep2
+ ep2.linked = ep1
+ return ep1, ep2
+}
+
+// Endpoint is one end of a pipe.
+type Endpoint struct {
+ dispatcher stack.NetworkDispatcher
+ linked *Endpoint
+ linkAddr tcpip.LinkAddress
+}
+
+// WritePacket implements stack.LinkEndpoint.
+func (e *Endpoint) WritePacket(r *stack.Route, _ *stack.GSO, proto tcpip.NetworkProtocolNumber, pkt *stack.PacketBuffer) *tcpip.Error {
+ if !e.linked.IsAttached() {
+ return nil
+ }
+
+ // Note that the local address from the perspective of this endpoint is the
+ // remote address from the perspective of the other end of the pipe
+ // (e.linked). Similarly, the remote address from the perspective of this
+ // endpoint is the local address on the other end.
+ e.linked.dispatcher.DeliverNetworkPacket(r.LocalLinkAddress /* remote */, r.RemoteLinkAddress() /* local */, proto, stack.NewPacketBuffer(stack.PacketBufferOptions{
+ Data: buffer.NewVectorisedView(pkt.Size(), pkt.Views()),
+ }))
+
+ return nil
+}
+
+// WritePackets implements stack.LinkEndpoint.
+func (*Endpoint) WritePackets(*stack.Route, *stack.GSO, stack.PacketBufferList, tcpip.NetworkProtocolNumber) (int, *tcpip.Error) {
+ panic("not implemented")
+}
+
+// Attach implements stack.LinkEndpoint.
+func (e *Endpoint) Attach(dispatcher stack.NetworkDispatcher) {
+ e.dispatcher = dispatcher
+}
+
+// IsAttached implements stack.LinkEndpoint.
+func (e *Endpoint) IsAttached() bool {
+ return e.dispatcher != nil
+}
+
+// Wait implements stack.LinkEndpoint.
+func (*Endpoint) Wait() {}
+
+// MTU implements stack.LinkEndpoint.
+func (*Endpoint) MTU() uint32 {
+ return header.IPv6MinimumMTU
+}
+
+// Capabilities implements stack.LinkEndpoint.
+func (*Endpoint) Capabilities() stack.LinkEndpointCapabilities {
+ return 0
+}
+
+// MaxHeaderLength implements stack.LinkEndpoint.
+func (*Endpoint) MaxHeaderLength() uint16 {
+ return 0
+}
+
+// LinkAddress implements stack.LinkEndpoint.
+func (e *Endpoint) LinkAddress() tcpip.LinkAddress {
+ return e.linkAddr
+}
+
+// ARPHardwareType implements stack.LinkEndpoint.
+func (*Endpoint) ARPHardwareType() header.ARPHardwareType {
+ return header.ARPHardwareNone
+}
+
+// AddHeader implements stack.LinkEndpoint.
+func (*Endpoint) AddHeader(_, _ tcpip.LinkAddress, _ tcpip.NetworkProtocolNumber, _ *stack.PacketBuffer) {
+}
diff --git a/pkg/tcpip/link/pipe/pipe_state_autogen.go b/pkg/tcpip/link/pipe/pipe_state_autogen.go
new file mode 100644
index 000000000..d3b40feb4
--- /dev/null
+++ b/pkg/tcpip/link/pipe/pipe_state_autogen.go
@@ -0,0 +1,3 @@
+// automatically generated by stateify.
+
+package pipe
diff --git a/pkg/tcpip/link/qdisc/fifo/endpoint.go b/pkg/tcpip/link/qdisc/fifo/endpoint.go
index 27667f5f0..b7458b620 100644
--- a/pkg/tcpip/link/qdisc/fifo/endpoint.go
+++ b/pkg/tcpip/link/qdisc/fifo/endpoint.go
@@ -154,8 +154,7 @@ func (e *endpoint) GSOMaxSize() uint32 {
func (e *endpoint) WritePacket(r *stack.Route, gso *stack.GSO, protocol tcpip.NetworkProtocolNumber, pkt *stack.PacketBuffer) *tcpip.Error {
// WritePacket caller's do not set the following fields in PacketBuffer
// so we populate them here.
- newRoute := r.Clone()
- pkt.EgressRoute = newRoute
+ pkt.EgressRoute = r
pkt.GSOOptions = gso
pkt.NetworkProtocolNumber = protocol
d := e.dispatchers[int(pkt.Hash)%len(e.dispatchers)]
@@ -178,11 +177,6 @@ func (e *endpoint) WritePackets(_ *stack.Route, _ *stack.GSO, pkts stack.PacketB
for pkt := pkts.Front(); pkt != nil; {
d := e.dispatchers[int(pkt.Hash)%len(e.dispatchers)]
nxt := pkt.Next()
- // Since qdisc can hold onto a packet for long we should Clone
- // the route here to ensure it doesn't get released while the
- // packet is still in our queue.
- newRoute := pkt.EgressRoute.Clone()
- pkt.EgressRoute = newRoute
if !d.q.enqueue(pkt) {
if enqueued > 0 {
d.newPacketWaker.Assert()
diff --git a/pkg/tcpip/link/qdisc/fifo/packet_buffer_queue.go b/pkg/tcpip/link/qdisc/fifo/packet_buffer_queue.go
index eb5abb906..45adcbccb 100644
--- a/pkg/tcpip/link/qdisc/fifo/packet_buffer_queue.go
+++ b/pkg/tcpip/link/qdisc/fifo/packet_buffer_queue.go
@@ -61,6 +61,7 @@ func (q *packetBufferQueue) enqueue(s *stack.PacketBuffer) bool {
q.mu.Lock()
r := q.used < q.limit
if r {
+ s.EgressRoute.Acquire()
q.list.PushBack(s)
q.used++
}
diff --git a/pkg/tcpip/link/sniffer/sniffer.go b/pkg/tcpip/link/sniffer/sniffer.go
index 8d9a91020..1a2cc39eb 100644
--- a/pkg/tcpip/link/sniffer/sniffer.go
+++ b/pkg/tcpip/link/sniffer/sniffer.go
@@ -263,7 +263,7 @@ func logPacket(prefix string, dir direction, protocol tcpip.NetworkProtocolNumbe
fragmentOffset = fragOffset
case header.ARPProtocolNumber:
- if parse.ARP(pkt) {
+ if !parse.ARP(pkt) {
return
}
diff --git a/pkg/tcpip/link/tun/device.go b/pkg/tcpip/link/tun/device.go
index a364c5801..bfac358f4 100644
--- a/pkg/tcpip/link/tun/device.go
+++ b/pkg/tcpip/link/tun/device.go
@@ -264,7 +264,7 @@ func (d *Device) encodePkt(info *channel.PacketInfo) (buffer.View, bool) {
// If the packet does not already have link layer header, and the route
// does not exist, we can't compute it. This is possibly a raw packet, tun
// device doesn't support this at the moment.
- if info.Pkt.LinkHeader().View().IsEmpty() && info.Route.RemoteLinkAddress() == "" {
+ if info.Pkt.LinkHeader().View().IsEmpty() && len(info.Route.RemoteLinkAddress) == 0 {
return nil, false
}
@@ -272,7 +272,7 @@ func (d *Device) encodePkt(info *channel.PacketInfo) (buffer.View, bool) {
if d.hasFlags(linux.IFF_TAP) {
// Add ethernet header if not provided.
if info.Pkt.LinkHeader().View().IsEmpty() {
- d.endpoint.AddHeader(info.Route.LocalLinkAddress, info.Route.RemoteLinkAddress(), info.Proto, info.Pkt)
+ d.endpoint.AddHeader(info.Route.LocalLinkAddress, info.Route.RemoteLinkAddress, info.Proto, info.Pkt)
}
vv.AppendView(info.Pkt.LinkHeader().View())
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-02 12:24:38 +0000