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-rw-r--r--pkg/sentry/socket/netstack/netstack.go1
-rw-r--r--pkg/tcpip/tcpip.go5
-rw-r--r--pkg/tcpip/transport/udp/endpoint.go11
-rw-r--r--pkg/tcpip/transport/udp/udp_test.go104
4 files changed, 103 insertions, 18 deletions
diff --git a/pkg/sentry/socket/netstack/netstack.go b/pkg/sentry/socket/netstack/netstack.go
index 3b248a953..5a3cedd7c 100644
--- a/pkg/sentry/socket/netstack/netstack.go
+++ b/pkg/sentry/socket/netstack/netstack.go
@@ -192,6 +192,7 @@ var Metrics = tcpip.Stats{
PacketsSent: mustCreateMetric("/netstack/udp/packets_sent", "Number of UDP datagrams sent."),
PacketSendErrors: mustCreateMetric("/netstack/udp/packet_send_errors", "Number of UDP datagrams failed to be sent."),
ChecksumErrors: mustCreateMetric("/netstack/udp/checksum_errors", "Number of UDP datagrams dropped due to bad checksums."),
+ InvalidSourceAddress: mustCreateMetric("/netstack/udp/invalid_source", "Number of UDP datagrams dropped due to invalid source address."),
},
}
diff --git a/pkg/tcpip/tcpip.go b/pkg/tcpip/tcpip.go
index 25534a10d..cf7291d09 100644
--- a/pkg/tcpip/tcpip.go
+++ b/pkg/tcpip/tcpip.go
@@ -782,7 +782,7 @@ type CongestionControlOption string
// control algorithms.
type AvailableCongestionControlOption string
-// buffer moderation.
+// ModerateReceiveBufferOption is used by buffer moderation.
type ModerateReceiveBufferOption bool
// TCPLingerTimeoutOption is used by SetSockOpt/GetSockOpt to set/get the
@@ -1244,6 +1244,9 @@ type UDPStats struct {
// ChecksumErrors is the number of datagrams dropped due to bad checksums.
ChecksumErrors *StatCounter
+
+ // InvalidSourceAddress is the number of invalid sourced datagrams dropped.
+ InvalidSourceAddress *StatCounter
}
// Stats holds statistics about the networking stack.
diff --git a/pkg/tcpip/transport/udp/endpoint.go b/pkg/tcpip/transport/udp/endpoint.go
index 0584ec8dc..4e9e114a9 100644
--- a/pkg/tcpip/transport/udp/endpoint.go
+++ b/pkg/tcpip/transport/udp/endpoint.go
@@ -1377,6 +1377,15 @@ func (e *endpoint) HandlePacket(r *stack.Route, id stack.TransportEndpointID, pk
return
}
+ // Never receive from a multicast address.
+ if header.IsV4MulticastAddress(id.RemoteAddress) ||
+ header.IsV6MulticastAddress(id.RemoteAddress) {
+ e.stack.Stats().UDP.InvalidSourceAddress.Increment()
+ e.stack.Stats().IP.InvalidSourceAddressesReceived.Increment()
+ e.stats.ReceiveErrors.MalformedPacketsReceived.Increment()
+ return
+ }
+
// Verify checksum unless RX checksum offload is enabled.
// On IPv4, UDP checksum is optional, and a zero value means
// the transmitter omitted the checksum generation (RFC768).
@@ -1395,10 +1404,10 @@ func (e *endpoint) HandlePacket(r *stack.Route, id stack.TransportEndpointID, pk
}
}
- e.rcvMu.Lock()
e.stack.Stats().UDP.PacketsReceived.Increment()
e.stats.PacketsReceived.Increment()
+ e.rcvMu.Lock()
// Drop the packet if our buffer is currently full.
if !e.rcvReady || e.rcvClosed {
e.rcvMu.Unlock()
diff --git a/pkg/tcpip/transport/udp/udp_test.go b/pkg/tcpip/transport/udp/udp_test.go
index 91ba031fa..90781cf49 100644
--- a/pkg/tcpip/transport/udp/udp_test.go
+++ b/pkg/tcpip/transport/udp/udp_test.go
@@ -83,16 +83,18 @@ type header4Tuple struct {
type testFlow int
const (
- unicastV4 testFlow = iota // V4 unicast on a V4 socket
- unicastV4in6 // V4-mapped unicast on a V6-dual socket
- unicastV6 // V6 unicast on a V6 socket
- unicastV6Only // V6 unicast on a V6-only socket
- multicastV4 // V4 multicast on a V4 socket
- multicastV4in6 // V4-mapped multicast on a V6-dual socket
- multicastV6 // V6 multicast on a V6 socket
- multicastV6Only // V6 multicast on a V6-only socket
- broadcast // V4 broadcast on a V4 socket
- broadcastIn6 // V4-mapped broadcast on a V6-dual socket
+ unicastV4 testFlow = iota // V4 unicast on a V4 socket
+ unicastV4in6 // V4-mapped unicast on a V6-dual socket
+ unicastV6 // V6 unicast on a V6 socket
+ unicastV6Only // V6 unicast on a V6-only socket
+ multicastV4 // V4 multicast on a V4 socket
+ multicastV4in6 // V4-mapped multicast on a V6-dual socket
+ multicastV6 // V6 multicast on a V6 socket
+ multicastV6Only // V6 multicast on a V6-only socket
+ broadcast // V4 broadcast on a V4 socket
+ broadcastIn6 // V4-mapped broadcast on a V6-dual socket
+ reverseMulticast4 // V4 multicast src. Must fail.
+ reverseMulticast6 // V6 multicast src. Must fail.
)
func (flow testFlow) String() string {
@@ -117,6 +119,10 @@ func (flow testFlow) String() string {
return "broadcast"
case broadcastIn6:
return "broadcastIn6"
+ case reverseMulticast4:
+ return "reverseMulticast4"
+ case reverseMulticast6:
+ return "reverseMulticast6"
default:
return "unknown"
}
@@ -168,6 +174,9 @@ func (flow testFlow) header4Tuple(d packetDirection) header4Tuple {
h.dstAddr.Addr = multicastV6Addr
}
}
+ if flow.isReverseMulticast() {
+ h.srcAddr.Addr = flow.getMcastAddr()
+ }
return h
}
@@ -199,9 +208,9 @@ func (flow testFlow) netProto() tcpip.NetworkProtocolNumber {
// endpoint for this flow.
func (flow testFlow) sockProto() tcpip.NetworkProtocolNumber {
switch flow {
- case unicastV4in6, unicastV6, unicastV6Only, multicastV4in6, multicastV6, multicastV6Only, broadcastIn6:
+ case unicastV4in6, unicastV6, unicastV6Only, multicastV4in6, multicastV6, multicastV6Only, broadcastIn6, reverseMulticast6:
return ipv6.ProtocolNumber
- case unicastV4, multicastV4, broadcast:
+ case unicastV4, multicastV4, broadcast, reverseMulticast4:
return ipv4.ProtocolNumber
default:
panic(fmt.Sprintf("invalid testFlow given: %d", flow))
@@ -224,7 +233,7 @@ func (flow testFlow) isV6Only() bool {
switch flow {
case unicastV6Only, multicastV6Only:
return true
- case unicastV4, unicastV4in6, unicastV6, multicastV4, multicastV4in6, multicastV6, broadcast, broadcastIn6:
+ case unicastV4, unicastV4in6, unicastV6, multicastV4, multicastV4in6, multicastV6, broadcast, broadcastIn6, reverseMulticast4, reverseMulticast6:
return false
default:
panic(fmt.Sprintf("invalid testFlow given: %d", flow))
@@ -235,7 +244,7 @@ func (flow testFlow) isMulticast() bool {
switch flow {
case multicastV4, multicastV4in6, multicastV6, multicastV6Only:
return true
- case unicastV4, unicastV4in6, unicastV6, unicastV6Only, broadcast, broadcastIn6:
+ case unicastV4, unicastV4in6, unicastV6, unicastV6Only, broadcast, broadcastIn6, reverseMulticast4, reverseMulticast6:
return false
default:
panic(fmt.Sprintf("invalid testFlow given: %d", flow))
@@ -246,7 +255,7 @@ func (flow testFlow) isBroadcast() bool {
switch flow {
case broadcast, broadcastIn6:
return true
- case unicastV4, unicastV4in6, unicastV6, unicastV6Only, multicastV4, multicastV4in6, multicastV6, multicastV6Only:
+ case unicastV4, unicastV4in6, unicastV6, unicastV6Only, multicastV4, multicastV4in6, multicastV6, multicastV6Only, reverseMulticast4, reverseMulticast6:
return false
default:
panic(fmt.Sprintf("invalid testFlow given: %d", flow))
@@ -257,13 +266,22 @@ func (flow testFlow) isMapped() bool {
switch flow {
case unicastV4in6, multicastV4in6, broadcastIn6:
return true
- case unicastV4, unicastV6, unicastV6Only, multicastV4, multicastV6, multicastV6Only, broadcast:
+ case unicastV4, unicastV6, unicastV6Only, multicastV4, multicastV6, multicastV6Only, broadcast, reverseMulticast4, reverseMulticast6:
return false
default:
panic(fmt.Sprintf("invalid testFlow given: %d", flow))
}
}
+func (flow testFlow) isReverseMulticast() bool {
+ switch flow {
+ case reverseMulticast4, reverseMulticast6:
+ return true
+ default:
+ return false
+ }
+}
+
type testContext struct {
t *testing.T
linkEP *channel.Endpoint
@@ -872,6 +890,60 @@ func TestV4ReadOnBoundToBroadcast(t *testing.T) {
}
}
+// TestReadFromMulticast checks that an endpoint will NOT receive a packet
+// that was sent with multicast SOURCE address.
+func TestReadFromMulticast(t *testing.T) {
+ for _, flow := range []testFlow{reverseMulticast4, reverseMulticast6} {
+ t.Run(fmt.Sprintf("flow:%s", flow), func(t *testing.T) {
+ c := newDualTestContext(t, defaultMTU)
+ defer c.cleanup()
+
+ c.createEndpointForFlow(flow)
+
+ if err := c.ep.Bind(tcpip.FullAddress{Port: stackPort}); err != nil {
+ t.Fatalf("Bind failed: %s", err)
+ }
+ testFailingRead(c, flow, false /* expectReadError */)
+ })
+ }
+}
+
+// TestReadFromMulticaststats checks that a discarded packet
+// that that was sent with multicast SOURCE address increments
+// the correct counters and that a regular packet does not.
+func TestReadFromMulticastStats(t *testing.T) {
+ t.Helper()
+ for _, flow := range []testFlow{reverseMulticast4, reverseMulticast6, unicastV4} {
+ t.Run(fmt.Sprintf("flow:%s", flow), func(t *testing.T) {
+ c := newDualTestContext(t, defaultMTU)
+ defer c.cleanup()
+
+ c.createEndpointForFlow(flow)
+
+ if err := c.ep.Bind(tcpip.FullAddress{Port: stackPort}); err != nil {
+ t.Fatalf("Bind failed: %s", err)
+ }
+
+ payload := newPayload()
+ c.injectPacket(flow, payload)
+
+ var want uint64 = 0
+ if flow.isReverseMulticast() {
+ want = 1
+ }
+ if got := c.s.Stats().IP.InvalidSourceAddressesReceived.Value(); got != want {
+ t.Errorf("got stats.IP.InvalidSourceAddressesReceived.Value() = %d, want = %d", got, want)
+ }
+ if got := c.s.Stats().UDP.InvalidSourceAddress.Value(); got != want {
+ t.Errorf("got stats.UDP.InvalidSourceAddress.Value() = %d, want = %d", got, want)
+ }
+ if got := c.ep.Stats().(*tcpip.TransportEndpointStats).ReceiveErrors.MalformedPacketsReceived.Value(); got != want {
+ t.Errorf("got EP Stats.ReceiveErrors.MalformedPacketsReceived stats = %d, want = %d", got, want)
+ }
+ })
+ }
+}
+
// TestV4ReadBroadcastOnBoundToWildcard checks that an endpoint can bind to ANY
// and receive broadcast and unicast data.
func TestV4ReadBroadcastOnBoundToWildcard(t *testing.T) {
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-02 08:24:38 +0000