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-rw-r--r--pkg/tcpip/link/pipe/pipe.go34
-rw-r--r--pkg/tcpip/stack/nic.go37
-rw-r--r--pkg/tcpip/stack/pending_packets.go51
-rw-r--r--pkg/tcpip/tests/integration/link_resolution_test.go125
4 files changed, 222 insertions, 25 deletions
diff --git a/pkg/tcpip/link/pipe/pipe.go b/pkg/tcpip/link/pipe/pipe.go
index d6e83a414..36aa9055c 100644
--- a/pkg/tcpip/link/pipe/pipe.go
+++ b/pkg/tcpip/link/pipe/pipe.go
@@ -45,12 +45,7 @@ type Endpoint struct {
linkAddr tcpip.LinkAddress
}
-// WritePacket implements stack.LinkEndpoint.
-func (e *Endpoint) WritePacket(r stack.RouteInfo, _ *stack.GSO, proto tcpip.NetworkProtocolNumber, pkt *stack.PacketBuffer) *tcpip.Error {
- if !e.linked.IsAttached() {
- return nil
- }
-
+func (e *Endpoint) deliverPackets(r stack.RouteInfo, proto tcpip.NetworkProtocolNumber, pkts stack.PacketBufferList) {
// 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
@@ -70,16 +65,33 @@ func (e *Endpoint) WritePacket(r stack.RouteInfo, _ *stack.GSO, proto tcpip.Netw
//
// TODO(gvisor.dev/issue/5289): don't use a new goroutine once we support send
// and receive queues.
- go e.linked.dispatcher.DeliverNetworkPacket(r.LocalLinkAddress /* remote */, r.RemoteLinkAddress /* local */, proto, stack.NewPacketBuffer(stack.PacketBufferOptions{
- Data: buffer.NewVectorisedView(pkt.Size(), pkt.Views()),
- }))
+ go func() {
+ for pkt := pkts.Front(); pkt != nil; pkt = pkt.Next() {
+ e.linked.dispatcher.DeliverNetworkPacket(r.LocalLinkAddress /* remote */, r.RemoteLinkAddress /* local */, proto, stack.NewPacketBuffer(stack.PacketBufferOptions{
+ Data: buffer.NewVectorisedView(pkt.Size(), pkt.Views()),
+ }))
+ }
+ }()
+}
+
+// WritePacket implements stack.LinkEndpoint.
+func (e *Endpoint) WritePacket(r stack.RouteInfo, _ *stack.GSO, proto tcpip.NetworkProtocolNumber, pkt *stack.PacketBuffer) *tcpip.Error {
+ if e.linked.IsAttached() {
+ var pkts stack.PacketBufferList
+ pkts.PushBack(pkt)
+ e.deliverPackets(r, proto, pkts)
+ }
return nil
}
// WritePackets implements stack.LinkEndpoint.
-func (*Endpoint) WritePackets(stack.RouteInfo, *stack.GSO, stack.PacketBufferList, tcpip.NetworkProtocolNumber) (int, *tcpip.Error) {
- panic("not implemented")
+func (e *Endpoint) WritePackets(r stack.RouteInfo, _ *stack.GSO, pkts stack.PacketBufferList, proto tcpip.NetworkProtocolNumber) (int, *tcpip.Error) {
+ if e.linked.IsAttached() {
+ e.deliverPackets(r, proto, pkts)
+ }
+
+ return pkts.Len(), nil
}
// Attach implements stack.LinkEndpoint.
diff --git a/pkg/tcpip/stack/nic.go b/pkg/tcpip/stack/nic.go
index d19150a20..447b5c99d 100644
--- a/pkg/tcpip/stack/nic.go
+++ b/pkg/tcpip/stack/nic.go
@@ -358,16 +358,43 @@ func (n *NIC) writePacket(r RouteInfo, gso *GSO, protocol tcpip.NetworkProtocolN
// WritePackets implements NetworkLinkEndpoint.
func (n *NIC) WritePackets(r *Route, gso *GSO, pkts PacketBufferList, protocol tcpip.NetworkProtocolNumber) (int, *tcpip.Error) {
- // TODO(gvisor.dev/issue/4458): Queue packets whie link address resolution
- // is being peformed like WritePacket.
- routeInfo := r.Fields()
+ // As per relevant RFCs, we should queue packets while we wait for link
+ // resolution to complete.
+ //
+ // RFC 1122 section 2.3.2.2 (for IPv4):
+ // The link layer SHOULD save (rather than discard) at least
+ // one (the latest) packet of each set of packets destined to
+ // the same unresolved IP address, and transmit the saved
+ // packet when the address has been resolved.
+ //
+ // RFC 4861 section 7.2.2 (for IPv6):
+ // While waiting for address resolution to complete, the sender MUST, for
+ // each neighbor, retain a small queue of packets waiting for address
+ // resolution to complete. The queue MUST hold at least one packet, and MAY
+ // contain more. However, the number of queued packets per neighbor SHOULD
+ // be limited to some small value. When a queue overflows, the new arrival
+ // SHOULD replace the oldest entry. Once address resolution completes, the
+ // node transmits any queued packets.
+ if ch, err := r.Resolve(nil); err != nil {
+ if err == tcpip.ErrWouldBlock {
+ r.Acquire()
+ n.linkResQueue.enqueue(ch, r, protocol, &pkts)
+ return pkts.Len(), nil
+ }
+ return 0, err
+ }
+
+ return n.writePackets(r.Fields(), gso, protocol, pkts)
+}
+
+func (n *NIC) writePackets(r RouteInfo, gso *GSO, protocol tcpip.NetworkProtocolNumber, pkts PacketBufferList) (int, *tcpip.Error) {
for pkt := pkts.Front(); pkt != nil; pkt = pkt.Next() {
- pkt.EgressRoute = routeInfo
+ pkt.EgressRoute = r
pkt.GSOOptions = gso
pkt.NetworkProtocolNumber = protocol
}
- writtenPackets, err := n.LinkEndpoint.WritePackets(routeInfo, gso, pkts, protocol)
+ writtenPackets, err := n.LinkEndpoint.WritePackets(r, gso, pkts, protocol)
n.stats.Tx.Packets.IncrementBy(uint64(writtenPackets))
writtenBytes := 0
for i, pb := 0, pkts.Front(); i < writtenPackets && pb != nil; i, pb = i+1, pb.Next() {
diff --git a/pkg/tcpip/stack/pending_packets.go b/pkg/tcpip/stack/pending_packets.go
index 81d8ff6e8..3ac039c7d 100644
--- a/pkg/tcpip/stack/pending_packets.go
+++ b/pkg/tcpip/stack/pending_packets.go
@@ -28,10 +28,26 @@ const (
maxPendingPacketsPerResolution = 256
)
+// pendingPacketBuffer is a pending packet buffer.
+//
+// TODO(gvisor.dev/issue/5331): Drop this when we drop WritePacket and only use
+// WritePackets so we can use a PacketBufferList everywhere.
+type pendingPacketBuffer interface {
+ len() int
+}
+
+func (*PacketBuffer) len() int {
+ return 1
+}
+
+func (p *PacketBufferList) len() int {
+ return p.Len()
+}
+
type pendingPacket struct {
route *Route
proto tcpip.NetworkProtocolNumber
- pkt *PacketBuffer
+ pkt pendingPacketBuffer
}
// packetsPendingLinkResolution is a queue of packets pending link resolution.
@@ -54,16 +70,17 @@ func (f *packetsPendingLinkResolution) init() {
f.packets = make(map[<-chan struct{}][]pendingPacket)
}
-func incrementOutgoingPacketErrors(r *Route, proto tcpip.NetworkProtocolNumber) {
- r.Stats().IP.OutgoingPacketErrors.Increment()
+func incrementOutgoingPacketErrors(r *Route, proto tcpip.NetworkProtocolNumber, pkt pendingPacketBuffer) {
+ n := uint64(pkt.len())
+ r.Stats().IP.OutgoingPacketErrors.IncrementBy(n)
// ok may be false if the endpoint's stats do not collect IP-related data.
if ipEndpointStats, ok := r.outgoingNIC.getNetworkEndpoint(proto).Stats().(IPNetworkEndpointStats); ok {
- ipEndpointStats.IPStats().OutgoingPacketErrors.Increment()
+ ipEndpointStats.IPStats().OutgoingPacketErrors.IncrementBy(n)
}
}
-func (f *packetsPendingLinkResolution) enqueue(ch <-chan struct{}, r *Route, proto tcpip.NetworkProtocolNumber, pkt *PacketBuffer) {
+func (f *packetsPendingLinkResolution) enqueue(ch <-chan struct{}, r *Route, proto tcpip.NetworkProtocolNumber, pkt pendingPacketBuffer) {
f.Lock()
defer f.Unlock()
@@ -73,7 +90,7 @@ func (f *packetsPendingLinkResolution) enqueue(ch <-chan struct{}, r *Route, pro
packets[0] = pendingPacket{}
packets = packets[1:]
- incrementOutgoingPacketErrors(r, proto)
+ incrementOutgoingPacketErrors(r, proto, p.pkt)
p.route.Release()
}
@@ -113,13 +130,29 @@ func (f *packetsPendingLinkResolution) enqueue(ch <-chan struct{}, r *Route, pro
for _, p := range packets {
if cancelled || p.route.IsResolutionRequired() {
- incrementOutgoingPacketErrors(r, proto)
+ incrementOutgoingPacketErrors(r, proto, p.pkt)
if linkResolvableEP, ok := p.route.outgoingNIC.getNetworkEndpoint(p.route.NetProto).(LinkResolvableNetworkEndpoint); ok {
- linkResolvableEP.HandleLinkResolutionFailure(pkt)
+ switch pkt := p.pkt.(type) {
+ case *PacketBuffer:
+ linkResolvableEP.HandleLinkResolutionFailure(pkt)
+ case *PacketBufferList:
+ for pb := pkt.Front(); pb != nil; pb = pb.Next() {
+ linkResolvableEP.HandleLinkResolutionFailure(pb)
+ }
+ default:
+ panic(fmt.Sprintf("unrecognized pending packet buffer type = %T", p.pkt))
+ }
}
} else {
- p.route.outgoingNIC.writePacket(p.route.Fields(), nil /* gso */, p.proto, p.pkt)
+ switch pkt := p.pkt.(type) {
+ case *PacketBuffer:
+ p.route.outgoingNIC.writePacket(p.route.Fields(), nil /* gso */, p.proto, pkt)
+ case *PacketBufferList:
+ p.route.outgoingNIC.writePackets(p.route.Fields(), nil /* gso */, p.proto, *pkt)
+ default:
+ panic(fmt.Sprintf("unrecognized pending packet buffer type = %T", p.pkt))
+ }
}
p.route.Release()
}
diff --git a/pkg/tcpip/tests/integration/link_resolution_test.go b/pkg/tcpip/tests/integration/link_resolution_test.go
index af32d3009..7afc4702c 100644
--- a/pkg/tcpip/tests/integration/link_resolution_test.go
+++ b/pkg/tcpip/tests/integration/link_resolution_test.go
@@ -23,6 +23,7 @@ import (
"github.com/google/go-cmp/cmp"
"github.com/google/go-cmp/cmp/cmpopts"
"gvisor.dev/gvisor/pkg/tcpip"
+ "gvisor.dev/gvisor/pkg/tcpip/buffer"
"gvisor.dev/gvisor/pkg/tcpip/checker"
"gvisor.dev/gvisor/pkg/tcpip/header"
"gvisor.dev/gvisor/pkg/tcpip/link/pipe"
@@ -32,6 +33,7 @@ import (
"gvisor.dev/gvisor/pkg/tcpip/stack"
"gvisor.dev/gvisor/pkg/tcpip/transport/icmp"
"gvisor.dev/gvisor/pkg/tcpip/transport/tcp"
+ "gvisor.dev/gvisor/pkg/tcpip/transport/udp"
"gvisor.dev/gvisor/pkg/waiter"
)
@@ -456,3 +458,126 @@ func TestGetLinkAddress(t *testing.T) {
})
}
}
+
+func TestWritePacketsLinkResolution(t *testing.T) {
+ const (
+ host1NICID = 1
+ host2NICID = 4
+ )
+
+ tests := []struct {
+ name string
+ netProto tcpip.NetworkProtocolNumber
+ remoteAddr tcpip.Address
+ expectedWriteErr *tcpip.Error
+ }{
+ {
+ name: "IPv4",
+ netProto: ipv4.ProtocolNumber,
+ remoteAddr: ipv4Addr2.AddressWithPrefix.Address,
+ expectedWriteErr: nil,
+ },
+ {
+ name: "IPv6",
+ netProto: ipv6.ProtocolNumber,
+ remoteAddr: ipv6Addr2.AddressWithPrefix.Address,
+ expectedWriteErr: nil,
+ },
+ }
+
+ for _, test := range tests {
+ t.Run(test.name, func(t *testing.T) {
+ stackOpts := stack.Options{
+ NetworkProtocols: []stack.NetworkProtocolFactory{arp.NewProtocol, ipv4.NewProtocol, ipv6.NewProtocol},
+ TransportProtocols: []stack.TransportProtocolFactory{udp.NewProtocol},
+ }
+
+ host1Stack, host2Stack := setupStack(t, stackOpts, host1NICID, host2NICID)
+
+ var serverWQ waiter.Queue
+ serverWE, serverCH := waiter.NewChannelEntry(nil)
+ serverWQ.EventRegister(&serverWE, waiter.EventIn)
+ serverEP, err := host2Stack.NewEndpoint(udp.ProtocolNumber, test.netProto, &serverWQ)
+ if err != nil {
+ t.Fatalf("host2Stack.NewEndpoint(%d, %d, _): %s", udp.ProtocolNumber, test.netProto, err)
+ }
+ defer serverEP.Close()
+
+ serverAddr := tcpip.FullAddress{Port: 1234}
+ if err := serverEP.Bind(serverAddr); err != nil {
+ t.Fatalf("serverEP.Bind(%#v): %s", serverAddr, err)
+ }
+
+ r, err := host1Stack.FindRoute(host1NICID, "", test.remoteAddr, test.netProto, false /* multicastLoop */)
+ if err != nil {
+ t.Fatalf("host1Stack.FindRoute(%d, '', %s, %d, false): %s", host1NICID, test.remoteAddr, test.netProto, err)
+ }
+ defer r.Release()
+
+ data := []byte{1, 2}
+ var pkts stack.PacketBufferList
+ for _, d := range data {
+ pkt := stack.NewPacketBuffer(stack.PacketBufferOptions{
+ ReserveHeaderBytes: header.UDPMinimumSize + int(r.MaxHeaderLength()),
+ Data: buffer.View([]byte{d}).ToVectorisedView(),
+ })
+ pkt.TransportProtocolNumber = udp.ProtocolNumber
+ length := uint16(pkt.Size())
+ udpHdr := header.UDP(pkt.TransportHeader().Push(header.UDPMinimumSize))
+ udpHdr.Encode(&header.UDPFields{
+ SrcPort: 5555,
+ DstPort: serverAddr.Port,
+ Length: length,
+ })
+ xsum := r.PseudoHeaderChecksum(udp.ProtocolNumber, length)
+ for _, v := range pkt.Data.Views() {
+ xsum = header.Checksum(v, xsum)
+ }
+ udpHdr.SetChecksum(^udpHdr.CalculateChecksum(xsum))
+
+ pkts.PushBack(pkt)
+ }
+
+ params := stack.NetworkHeaderParams{
+ Protocol: udp.ProtocolNumber,
+ TTL: 64,
+ TOS: stack.DefaultTOS,
+ }
+
+ if n, err := r.WritePackets(nil /* gso */, pkts, params); err != nil {
+ t.Fatalf("r.WritePackets(nil, %#v, _): %s", params, err)
+ } else if want := pkts.Len(); want != n {
+ t.Fatalf("got r.WritePackets(nil, %#v, _) = %d, want = %d", n, params, want)
+ }
+
+ var writer bytes.Buffer
+ count := 0
+ for {
+ var rOpts tcpip.ReadOptions
+ res, err := serverEP.Read(&writer, rOpts)
+ if err != nil {
+ if err == tcpip.ErrWouldBlock {
+ // Should not have anymore bytes to read after we read the sent
+ // number of bytes.
+ if count == len(data) {
+ break
+ }
+
+ <-serverCH
+ continue
+ }
+
+ t.Fatalf("serverEP.Read(_, %#v): %s", rOpts, err)
+ }
+ count += res.Count
+ }
+
+ if got, want := host2Stack.Stats().UDP.PacketsReceived.Value(), uint64(len(data)); got != want {
+ t.Errorf("got host2Stack.Stats().UDP.PacketsReceived.Value() = %d, want = %d", got, want)
+ }
+ if diff := cmp.Diff(data, writer.Bytes()); diff != "" {
+ t.Errorf("read bytes mismatch (-want +got):\n%s", diff)
+ }
+ })
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-26 05:14:06 +0000