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-rw-r--r--pkg/tcpip/network/arp/arp.go6
-rw-r--r--pkg/tcpip/network/ip_test.go3
-rw-r--r--pkg/tcpip/network/ipv4/icmp.go10
-rw-r--r--pkg/tcpip/network/ipv4/ipv4.go15
-rw-r--r--pkg/tcpip/network/ipv6/icmp.go10
-rw-r--r--pkg/tcpip/network/ipv6/icmp_test.go3
-rw-r--r--pkg/tcpip/network/ipv6/ipv6.go13
-rw-r--r--pkg/tcpip/stack/forwarder_test.go4
-rw-r--r--pkg/tcpip/stack/nic.go48
-rw-r--r--pkg/tcpip/stack/nic_test.go5
-rw-r--r--pkg/tcpip/stack/registration.go30
-rw-r--r--pkg/tcpip/stack/stack_test.go5
-rw-r--r--pkg/tcpip/tcpip.go11
13 files changed, 65 insertions, 98 deletions
diff --git a/pkg/tcpip/network/arp/arp.go b/pkg/tcpip/network/arp/arp.go
index 81e286e80..cb9225bd7 100644
--- a/pkg/tcpip/network/arp/arp.go
+++ b/pkg/tcpip/network/arp/arp.go
@@ -238,12 +238,6 @@ func (*protocol) Parse(pkt *stack.PacketBuffer) (proto tcpip.TransportProtocolNu
return 0, false, parse.ARP(pkt)
}
-// ReturnError implements stack.TransportProtocol.ReturnError.
-func (*protocol) ReturnError(*stack.Route, tcpip.ICMPReason, *stack.PacketBuffer) *tcpip.Error {
- // In ARP, there is no such response so do nothing.
- return nil
-}
-
// NewProtocol returns an ARP network protocol.
func NewProtocol() stack.NetworkProtocol {
return &protocol{}
diff --git a/pkg/tcpip/network/ip_test.go b/pkg/tcpip/network/ip_test.go
index e45dd17f8..477635f97 100644
--- a/pkg/tcpip/network/ip_test.go
+++ b/pkg/tcpip/network/ip_test.go
@@ -98,9 +98,10 @@ func (t *testObject) checkValues(protocol tcpip.TransportProtocolNumber, vv buff
// DeliverTransportPacket is called by network endpoints after parsing incoming
// packets. This is used by the test object to verify that the results of the
// parsing are expected.
-func (t *testObject) DeliverTransportPacket(r *stack.Route, protocol tcpip.TransportProtocolNumber, pkt *stack.PacketBuffer) {
+func (t *testObject) DeliverTransportPacket(r *stack.Route, protocol tcpip.TransportProtocolNumber, pkt *stack.PacketBuffer) stack.TransportPacketDisposition {
t.checkValues(protocol, pkt.Data, r.RemoteAddress, r.LocalAddress)
t.dataCalls++
+ return stack.TransportPacketHandled
}
// DeliverTransportControlPacket is called by network endpoints after parsing
diff --git a/pkg/tcpip/network/ipv4/icmp.go b/pkg/tcpip/network/ipv4/icmp.go
index 5fe73315f..3e5cf2ad9 100644
--- a/pkg/tcpip/network/ipv4/icmp.go
+++ b/pkg/tcpip/network/ipv4/icmp.go
@@ -200,16 +200,6 @@ func (e *endpoint) handleICMP(r *stack.Route, pkt *stack.PacketBuffer) {
// ======= ICMP Error packet generation =========
-// ReturnError implements stack.TransportProtocol.ReturnError.
-func (p *protocol) ReturnError(r *stack.Route, reason tcpip.ICMPReason, pkt *stack.PacketBuffer) *tcpip.Error {
- switch reason.(type) {
- case *tcpip.ICMPReasonPortUnreachable:
- return returnError(r, &icmpReasonPortUnreachable{}, pkt)
- default:
- return tcpip.ErrNotSupported
- }
-}
-
// icmpReason is a marker interface for IPv4 specific ICMP errors.
type icmpReason interface {
isICMPReason()
diff --git a/pkg/tcpip/network/ipv4/ipv4.go b/pkg/tcpip/network/ipv4/ipv4.go
index 135444222..e589d923d 100644
--- a/pkg/tcpip/network/ipv4/ipv4.go
+++ b/pkg/tcpip/network/ipv4/ipv4.go
@@ -21,6 +21,7 @@
package ipv4
import (
+ "fmt"
"sync/atomic"
"gvisor.dev/gvisor/pkg/tcpip"
@@ -463,7 +464,19 @@ func (e *endpoint) HandlePacket(r *stack.Route, pkt *stack.PacketBuffer) {
return
}
r.Stats().IP.PacketsDelivered.Increment()
- e.dispatcher.DeliverTransportPacket(r, p, pkt)
+
+ switch res := e.dispatcher.DeliverTransportPacket(r, p, pkt); res {
+ case stack.TransportPacketHandled:
+ case stack.TransportPacketDestinationPortUnreachable:
+ // As per RFC: 1122 Section 3.2.2.1 A host SHOULD generate Destination
+ // Unreachable messages with code:
+ // 3 (Port Unreachable), when the designated transport protocol
+ // (e.g., UDP) is unable to demultiplex the datagram but has no
+ // protocol mechanism to inform the sender.
+ _ = returnError(r, &icmpReasonPortUnreachable{}, pkt)
+ default:
+ panic(fmt.Sprintf("unrecognized result from DeliverTransportPacket = %d", res))
+ }
}
// Close cleans up resources associated with the endpoint.
diff --git a/pkg/tcpip/network/ipv6/icmp.go b/pkg/tcpip/network/ipv6/icmp.go
index 072c8ccd7..dd3295b31 100644
--- a/pkg/tcpip/network/ipv6/icmp.go
+++ b/pkg/tcpip/network/ipv6/icmp.go
@@ -671,16 +671,6 @@ func (*protocol) ResolveStaticAddress(addr tcpip.Address) (tcpip.LinkAddress, bo
// ======= ICMP Error packet generation =========
-// ReturnError implements stack.TransportProtocol.ReturnError.
-func (p *protocol) ReturnError(r *stack.Route, reason tcpip.ICMPReason, pkt *stack.PacketBuffer) *tcpip.Error {
- switch reason.(type) {
- case *tcpip.ICMPReasonPortUnreachable:
- return returnError(r, &icmpReasonPortUnreachable{}, pkt)
- default:
- return tcpip.ErrNotSupported
- }
-}
-
// icmpReason is a marker interface for IPv6 specific ICMP errors.
type icmpReason interface {
isICMPReason()
diff --git a/pkg/tcpip/network/ipv6/icmp_test.go b/pkg/tcpip/network/ipv6/icmp_test.go
index 0f50bfb8e..f82e34209 100644
--- a/pkg/tcpip/network/ipv6/icmp_test.go
+++ b/pkg/tcpip/network/ipv6/icmp_test.go
@@ -75,7 +75,8 @@ type stubDispatcher struct {
stack.TransportDispatcher
}
-func (*stubDispatcher) DeliverTransportPacket(*stack.Route, tcpip.TransportProtocolNumber, *stack.PacketBuffer) {
+func (*stubDispatcher) DeliverTransportPacket(*stack.Route, tcpip.TransportProtocolNumber, *stack.PacketBuffer) stack.TransportPacketDisposition {
+ return stack.TransportPacketHandled
}
type stubLinkAddressCache struct {
diff --git a/pkg/tcpip/network/ipv6/ipv6.go b/pkg/tcpip/network/ipv6/ipv6.go
index 5b1cca180..3d070ddea 100644
--- a/pkg/tcpip/network/ipv6/ipv6.go
+++ b/pkg/tcpip/network/ipv6/ipv6.go
@@ -482,7 +482,18 @@ func (e *endpoint) HandlePacket(r *stack.Route, pkt *stack.PacketBuffer) {
r.Stats().IP.PacketsDelivered.Increment()
// TODO(b/152019344): Send an ICMPv6 Parameter Problem, Code 1 error
// in response to unrecognized next header values.
- e.dispatcher.DeliverTransportPacket(r, p, pkt)
+ switch res := e.dispatcher.DeliverTransportPacket(r, p, pkt); res {
+ case stack.TransportPacketHandled:
+ case stack.TransportPacketDestinationPortUnreachable:
+ // As per RFC 4443 section 3.1:
+ // A destination node SHOULD originate a Destination Unreachable
+ // message with Code 4 in response to a packet for which the
+ // transport protocol (e.g., UDP) has no listener, if that transport
+ // protocol has no alternative means to inform the sender.
+ _ = returnError(r, &icmpReasonPortUnreachable{}, pkt)
+ default:
+ panic(fmt.Sprintf("unrecognized result from DeliverTransportPacket = %d", res))
+ }
}
default:
diff --git a/pkg/tcpip/stack/forwarder_test.go b/pkg/tcpip/stack/forwarder_test.go
index e30927821..38c5bac71 100644
--- a/pkg/tcpip/stack/forwarder_test.go
+++ b/pkg/tcpip/stack/forwarder_test.go
@@ -145,10 +145,6 @@ func (*fwdTestNetworkProtocol) Parse(pkt *PacketBuffer) (tcpip.TransportProtocol
return tcpip.TransportProtocolNumber(netHeader[protocolNumberOffset]), true, true
}
-func (*fwdTestNetworkProtocol) ReturnError(*Route, tcpip.ICMPReason, *PacketBuffer) *tcpip.Error {
- return nil
-}
-
func (f *fwdTestNetworkProtocol) NewEndpoint(nicID tcpip.NICID, _ LinkAddressCache, _ NUDHandler, dispatcher TransportDispatcher, ep LinkEndpoint, _ *Stack) NetworkEndpoint {
return &fwdTestNetworkEndpoint{
nicID: nicID,
diff --git a/pkg/tcpip/stack/nic.go b/pkg/tcpip/stack/nic.go
index 06d70dd1c..2875a5b60 100644
--- a/pkg/tcpip/stack/nic.go
+++ b/pkg/tcpip/stack/nic.go
@@ -1398,11 +1398,13 @@ func (n *NIC) forwardPacket(r *Route, protocol tcpip.NetworkProtocolNumber, pkt
// DeliverTransportPacket delivers the packets to the appropriate transport
// protocol endpoint.
-func (n *NIC) DeliverTransportPacket(r *Route, protocol tcpip.TransportProtocolNumber, pkt *PacketBuffer) {
+func (n *NIC) DeliverTransportPacket(r *Route, protocol tcpip.TransportProtocolNumber, pkt *PacketBuffer) TransportPacketDisposition {
state, ok := n.stack.transportProtocols[protocol]
if !ok {
+ // TODO(gvisor.dev/issue/4365): Let the caller know that the transport
+ // protocol is unrecognized.
n.stack.stats.UnknownProtocolRcvdPackets.Increment()
- return
+ return TransportPacketHandled
}
transProto := state.proto
@@ -1423,59 +1425,47 @@ func (n *NIC) DeliverTransportPacket(r *Route, protocol tcpip.TransportProtocolN
// we parse it using the minimum size.
if _, ok := pkt.TransportHeader().Consume(transProto.MinimumPacketSize()); !ok {
n.stack.stats.MalformedRcvdPackets.Increment()
- return
+ // We consider a malformed transport packet handled because there is
+ // nothing the caller can do.
+ return TransportPacketHandled
}
- } else {
- // This is either a bad packet or was re-assembled from fragments.
- transProto.Parse(pkt)
+ } else if !transProto.Parse(pkt) {
+ n.stack.stats.MalformedRcvdPackets.Increment()
+ return TransportPacketHandled
}
}
- if pkt.TransportHeader().View().Size() < transProto.MinimumPacketSize() {
- n.stack.stats.MalformedRcvdPackets.Increment()
- return
- }
-
srcPort, dstPort, err := transProto.ParsePorts(pkt.TransportHeader().View())
if err != nil {
n.stack.stats.MalformedRcvdPackets.Increment()
- return
+ return TransportPacketHandled
}
id := TransportEndpointID{dstPort, r.LocalAddress, srcPort, r.RemoteAddress}
if n.stack.demux.deliverPacket(r, protocol, pkt, id) {
- return
+ return TransportPacketHandled
}
// Try to deliver to per-stack default handler.
if state.defaultHandler != nil {
if state.defaultHandler(r, id, pkt) {
- return
+ return TransportPacketHandled
}
}
// We could not find an appropriate destination for this packet so
// give the protocol specific error handler a chance to handle it.
// If it doesn't handle it then we should do so.
- switch transProto.HandleUnknownDestinationPacket(r, id, pkt) {
+ switch res := transProto.HandleUnknownDestinationPacket(r, id, pkt); res {
case UnknownDestinationPacketMalformed:
n.stack.stats.MalformedRcvdPackets.Increment()
+ return TransportPacketHandled
case UnknownDestinationPacketUnhandled:
- // As per RFC: 1122 Section 3.2.2.1 A host SHOULD generate Destination
- // Unreachable messages with code:
- // 3 (Port Unreachable), when the designated transport protocol
- // (e.g., UDP) is unable to demultiplex the datagram but has no
- // protocol mechanism to inform the sender.
- np, ok := n.stack.networkProtocols[r.NetProto]
- if !ok {
- // For this to happen stack.makeRoute() must have been called with the
- // incorrect protocol number. Since we have successfully completed
- // network layer processing this should be impossible.
- panic(fmt.Sprintf("expected stack to have a NetworkProtocol for proto = %d", r.NetProto))
- }
-
- _ = np.ReturnError(r, &tcpip.ICMPReasonPortUnreachable{}, pkt)
+ return TransportPacketDestinationPortUnreachable
case UnknownDestinationPacketHandled:
+ return TransportPacketHandled
+ default:
+ panic(fmt.Sprintf("unrecognized result from HandleUnknownDestinationPacket = %d", res))
}
}
diff --git a/pkg/tcpip/stack/nic_test.go b/pkg/tcpip/stack/nic_test.go
index ef6e63b3e..dd6474297 100644
--- a/pkg/tcpip/stack/nic_test.go
+++ b/pkg/tcpip/stack/nic_test.go
@@ -221,11 +221,6 @@ func (*testIPv6Protocol) Parse(*PacketBuffer) (tcpip.TransportProtocolNumber, bo
return 0, false, false
}
-// ReturnError implements NetworkProtocol.ReturnError.
-func (*testIPv6Protocol) ReturnError(*Route, tcpip.ICMPReason, *PacketBuffer) *tcpip.Error {
- return nil
-}
-
var _ LinkAddressResolver = (*testIPv6Protocol)(nil)
// LinkAddressProtocol implements LinkAddressResolver.
diff --git a/pkg/tcpip/stack/registration.go b/pkg/tcpip/stack/registration.go
index 77640cd8a..780a5ebde 100644
--- a/pkg/tcpip/stack/registration.go
+++ b/pkg/tcpip/stack/registration.go
@@ -197,6 +197,21 @@ type TransportProtocol interface {
Parse(pkt *PacketBuffer) (ok bool)
}
+// TransportPacketDisposition is the result from attempting to deliver a packet
+// to the transport layer.
+type TransportPacketDisposition int
+
+const (
+ // TransportPacketHandled indicates that a transport packet was handled by the
+ // transport layer and callers need not take any further action.
+ TransportPacketHandled TransportPacketDisposition = iota
+
+ // TransportPacketDestinationPortUnreachable indicates that there weren't any
+ // listeners interested in the packet and the transport protocol has no means
+ // to notify the sender.
+ TransportPacketDestinationPortUnreachable
+)
+
// TransportDispatcher contains the methods used by the network stack to deliver
// packets to the appropriate transport endpoint after it has been handled by
// the network layer.
@@ -207,7 +222,7 @@ type TransportDispatcher interface {
// pkt.NetworkHeader must be set before calling DeliverTransportPacket.
//
// DeliverTransportPacket takes ownership of pkt.
- DeliverTransportPacket(r *Route, protocol tcpip.TransportProtocolNumber, pkt *PacketBuffer)
+ DeliverTransportPacket(r *Route, protocol tcpip.TransportProtocolNumber, pkt *PacketBuffer) TransportPacketDisposition
// DeliverTransportControlPacket delivers control packets to the
// appropriate transport protocol endpoint.
@@ -342,19 +357,6 @@ type NetworkProtocol interface {
// does not encapsulate anything).
// - Whether pkt.Data was large enough to parse and set pkt.NetworkHeader.
Parse(pkt *PacketBuffer) (proto tcpip.TransportProtocolNumber, hasTransportHdr bool, ok bool)
-
- // ReturnError attempts to send a suitable error message to the sender
- // of a received packet.
- // - pkt holds the problematic packet.
- // - reason indicates what the reason for wanting a message is.
- // - route is the routing information for the received packet
- // ReturnError returns an error if the send failed and nil on success.
- // Note that deciding to deliberately send no message is a success.
- //
- // TODO(gvisor.dev/issues/3871): This method should be removed or simplified
- // after all (or all but one) of the ICMP error dispatch occurs through the
- // protocol specific modules. May become SendPortNotFound(r, pkt).
- ReturnError(r *Route, reason tcpip.ICMPReason, pkt *PacketBuffer) *tcpip.Error
}
// NetworkDispatcher contains the methods used by the network stack to deliver
diff --git a/pkg/tcpip/stack/stack_test.go b/pkg/tcpip/stack/stack_test.go
index 9ef6787c6..f92850053 100644
--- a/pkg/tcpip/stack/stack_test.go
+++ b/pkg/tcpip/stack/stack_test.go
@@ -216,11 +216,6 @@ func (f *fakeNetworkProtocol) Option(option tcpip.GettableNetworkProtocolOption)
}
}
-// ReturnError implements NetworkProtocol.ReturnError
-func (*fakeNetworkProtocol) ReturnError(*stack.Route, tcpip.ICMPReason, *stack.PacketBuffer) *tcpip.Error {
- return nil
-}
-
// Close implements NetworkProtocol.Close.
func (*fakeNetworkProtocol) Close() {}
diff --git a/pkg/tcpip/tcpip.go b/pkg/tcpip/tcpip.go
index fa73cfa47..464608dee 100644
--- a/pkg/tcpip/tcpip.go
+++ b/pkg/tcpip/tcpip.go
@@ -1987,14 +1987,3 @@ func DeleteDanglingEndpoint(e Endpoint) {
// AsyncLoading is the global barrier for asynchronous endpoint loading
// activities.
var AsyncLoading sync.WaitGroup
-
-// ICMPReason is a marker interface for network protocol agnostic ICMP errors.
-type ICMPReason interface {
- isICMP()
-}
-
-// ICMPReasonPortUnreachable is an error where the transport protocol has no
-// listener and no alternative means to inform the sender.
-type ICMPReasonPortUnreachable struct{}
-
-func (*ICMPReasonPortUnreachable) isICMP() {}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-08 17:46:54 +0000