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-rw-r--r--pkg/tcpip/network/ipv4/icmp.go89
-rw-r--r--pkg/tcpip/network/ipv4/ipv4.go28
-rw-r--r--pkg/tcpip/network/ipv4/ipv4_test.go136
-rw-r--r--pkg/tcpip/network/ipv6/BUILD1
-rw-r--r--pkg/tcpip/network/ipv6/icmp.go77
-rw-r--r--pkg/tcpip/network/ipv6/icmp_test.go3
-rw-r--r--pkg/tcpip/network/ipv6/ipv6.go33
-rw-r--r--pkg/tcpip/network/ipv6/ipv6_test.go146
8 files changed, 420 insertions, 93 deletions
diff --git a/pkg/tcpip/network/ipv4/icmp.go b/pkg/tcpip/network/ipv4/icmp.go
index 2aa38eb98..d51c36f19 100644
--- a/pkg/tcpip/network/ipv4/icmp.go
+++ b/pkg/tcpip/network/ipv4/icmp.go
@@ -240,12 +240,6 @@ func (e *endpoint) handleICMP(pkt *stack.PacketBuffer) {
case header.ICMPv4Echo:
received.echoRequest.Increment()
- sent := e.stats.icmp.packetsSent
- if !e.protocol.stack.AllowICMPMessage() {
- sent.rateLimited.Increment()
- return
- }
-
// DeliverTransportPacket will take ownership of pkt so don't use it beyond
// this point. Make a deep copy of the data before pkt gets sent as we will
// be modifying fields.
@@ -281,6 +275,12 @@ func (e *endpoint) handleICMP(pkt *stack.PacketBuffer) {
}
defer r.Release()
+ sent := e.stats.icmp.packetsSent
+ if !e.protocol.allowICMPReply(header.ICMPv4EchoReply, header.ICMPv4UnusedCode) {
+ sent.rateLimited.Increment()
+ return
+ }
+
// TODO(gvisor.dev/issue/3810:) When adding protocol numbers into the
// header information, we may have to change this code to handle the
// ICMP header no longer being in the data buffer.
@@ -562,13 +562,6 @@ func (p *protocol) returnError(reason icmpReason, pkt *stack.PacketBuffer) tcpip
return &tcpip.ErrNotConnected{}
}
- sent := netEP.stats.icmp.packetsSent
-
- if !p.stack.AllowICMPMessage() {
- sent.rateLimited.Increment()
- return nil
- }
-
transportHeader := pkt.TransportHeader().View()
// Don't respond to icmp error packets.
@@ -606,6 +599,35 @@ func (p *protocol) returnError(reason icmpReason, pkt *stack.PacketBuffer) tcpip
}
}
+ sent := netEP.stats.icmp.packetsSent
+ icmpType, icmpCode, counter, pointer := func() (header.ICMPv4Type, header.ICMPv4Code, tcpip.MultiCounterStat, byte) {
+ switch reason := reason.(type) {
+ case *icmpReasonPortUnreachable:
+ return header.ICMPv4DstUnreachable, header.ICMPv4PortUnreachable, sent.dstUnreachable, 0
+ case *icmpReasonProtoUnreachable:
+ return header.ICMPv4DstUnreachable, header.ICMPv4ProtoUnreachable, sent.dstUnreachable, 0
+ case *icmpReasonNetworkUnreachable:
+ return header.ICMPv4DstUnreachable, header.ICMPv4NetUnreachable, sent.dstUnreachable, 0
+ case *icmpReasonHostUnreachable:
+ return header.ICMPv4DstUnreachable, header.ICMPv4HostUnreachable, sent.dstUnreachable, 0
+ case *icmpReasonFragmentationNeeded:
+ return header.ICMPv4DstUnreachable, header.ICMPv4FragmentationNeeded, sent.dstUnreachable, 0
+ case *icmpReasonTTLExceeded:
+ return header.ICMPv4TimeExceeded, header.ICMPv4TTLExceeded, sent.timeExceeded, 0
+ case *icmpReasonReassemblyTimeout:
+ return header.ICMPv4TimeExceeded, header.ICMPv4ReassemblyTimeout, sent.timeExceeded, 0
+ case *icmpReasonParamProblem:
+ return header.ICMPv4ParamProblem, header.ICMPv4UnusedCode, sent.paramProblem, reason.pointer
+ default:
+ panic(fmt.Sprintf("unsupported ICMP type %T", reason))
+ }
+ }()
+
+ if !p.allowICMPReply(icmpType, icmpCode) {
+ sent.rateLimited.Increment()
+ return nil
+ }
+
// Now work out how much of the triggering packet we should return.
// As per RFC 1812 Section 4.3.2.3
//
@@ -658,44 +680,9 @@ func (p *protocol) returnError(reason icmpReason, pkt *stack.PacketBuffer) tcpip
icmpPkt.TransportProtocolNumber = header.ICMPv4ProtocolNumber
icmpHdr := header.ICMPv4(icmpPkt.TransportHeader().Push(header.ICMPv4MinimumSize))
- var counter tcpip.MultiCounterStat
- switch reason := reason.(type) {
- case *icmpReasonPortUnreachable:
- icmpHdr.SetType(header.ICMPv4DstUnreachable)
- icmpHdr.SetCode(header.ICMPv4PortUnreachable)
- counter = sent.dstUnreachable
- case *icmpReasonProtoUnreachable:
- icmpHdr.SetType(header.ICMPv4DstUnreachable)
- icmpHdr.SetCode(header.ICMPv4ProtoUnreachable)
- counter = sent.dstUnreachable
- case *icmpReasonNetworkUnreachable:
- icmpHdr.SetType(header.ICMPv4DstUnreachable)
- icmpHdr.SetCode(header.ICMPv4NetUnreachable)
- counter = sent.dstUnreachable
- case *icmpReasonHostUnreachable:
- icmpHdr.SetType(header.ICMPv4DstUnreachable)
- icmpHdr.SetCode(header.ICMPv4HostUnreachable)
- counter = sent.dstUnreachable
- case *icmpReasonFragmentationNeeded:
- icmpHdr.SetType(header.ICMPv4DstUnreachable)
- icmpHdr.SetCode(header.ICMPv4FragmentationNeeded)
- counter = sent.dstUnreachable
- case *icmpReasonTTLExceeded:
- icmpHdr.SetType(header.ICMPv4TimeExceeded)
- icmpHdr.SetCode(header.ICMPv4TTLExceeded)
- counter = sent.timeExceeded
- case *icmpReasonReassemblyTimeout:
- icmpHdr.SetType(header.ICMPv4TimeExceeded)
- icmpHdr.SetCode(header.ICMPv4ReassemblyTimeout)
- counter = sent.timeExceeded
- case *icmpReasonParamProblem:
- icmpHdr.SetType(header.ICMPv4ParamProblem)
- icmpHdr.SetCode(header.ICMPv4UnusedCode)
- icmpHdr.SetPointer(reason.pointer)
- counter = sent.paramProblem
- default:
- panic(fmt.Sprintf("unsupported ICMP type %T", reason))
- }
+ icmpHdr.SetCode(icmpCode)
+ icmpHdr.SetType(icmpType)
+ icmpHdr.SetPointer(pointer)
icmpHdr.SetChecksum(header.ICMPv4Checksum(icmpHdr, icmpPkt.Data().AsRange().Checksum()))
if err := route.WritePacket(
diff --git a/pkg/tcpip/network/ipv4/ipv4.go b/pkg/tcpip/network/ipv4/ipv4.go
index 63223bc92..25f5a52e3 100644
--- a/pkg/tcpip/network/ipv4/ipv4.go
+++ b/pkg/tcpip/network/ipv4/ipv4.go
@@ -1215,6 +1215,9 @@ type protocol struct {
// eps is keyed by NICID to allow protocol methods to retrieve an endpoint
// when handling a packet, by looking at which NIC handled the packet.
eps map[tcpip.NICID]*endpoint
+
+ // ICMP types for which the stack's global rate limiting must apply.
+ icmpRateLimitedTypes map[header.ICMPv4Type]struct{}
}
// defaultTTL is the current default TTL for the protocol. Only the
@@ -1330,6 +1333,23 @@ func (*protocol) Parse(pkt *stack.PacketBuffer) (proto tcpip.TransportProtocolNu
return ipHdr.TransportProtocol(), !ipHdr.More() && ipHdr.FragmentOffset() == 0, true
}
+// allowICMPReply reports whether an ICMP reply with provided type and code may
+// be sent following the rate mask options and global ICMP rate limiter.
+func (p *protocol) allowICMPReply(icmpType header.ICMPv4Type, code header.ICMPv4Code) bool {
+ // Mimic linux and never rate limit for PMTU discovery.
+ // https://github.com/torvalds/linux/blob/9e9fb7655ed585da8f468e29221f0ba194a5f613/net/ipv4/icmp.c#L288
+ if icmpType == header.ICMPv4DstUnreachable && code == header.ICMPv4FragmentationNeeded {
+ return true
+ }
+ p.mu.RLock()
+ defer p.mu.RUnlock()
+
+ if _, ok := p.mu.icmpRateLimitedTypes[icmpType]; ok {
+ return p.stack.AllowICMPMessage()
+ }
+ return true
+}
+
// calculateNetworkMTU calculates the network-layer payload MTU based on the
// link-layer payload mtu.
func calculateNetworkMTU(linkMTU, networkHeaderSize uint32) (uint32, tcpip.Error) {
@@ -1409,6 +1429,14 @@ func NewProtocolWithOptions(opts Options) stack.NetworkProtocolFactory {
}
p.fragmentation = fragmentation.NewFragmentation(fragmentblockSize, fragmentation.HighFragThreshold, fragmentation.LowFragThreshold, ReassembleTimeout, s.Clock(), p)
p.mu.eps = make(map[tcpip.NICID]*endpoint)
+ // Set ICMP rate limiting to Linux defaults.
+ // See https://man7.org/linux/man-pages/man7/icmp.7.html.
+ p.mu.icmpRateLimitedTypes = map[header.ICMPv4Type]struct{}{
+ header.ICMPv4DstUnreachable: struct{}{},
+ header.ICMPv4SrcQuench: struct{}{},
+ header.ICMPv4TimeExceeded: struct{}{},
+ header.ICMPv4ParamProblem: struct{}{},
+ }
return p
}
}
diff --git a/pkg/tcpip/network/ipv4/ipv4_test.go b/pkg/tcpip/network/ipv4/ipv4_test.go
index e7b5b3ea2..ef91245d7 100644
--- a/pkg/tcpip/network/ipv4/ipv4_test.go
+++ b/pkg/tcpip/network/ipv4/ipv4_test.go
@@ -3373,3 +3373,139 @@ func TestCloseLocking(t *testing.T) {
}
}()
}
+
+func TestIcmpRateLimit(t *testing.T) {
+ var (
+ host1IPv4Addr = tcpip.ProtocolAddress{
+ Protocol: ipv4.ProtocolNumber,
+ AddressWithPrefix: tcpip.AddressWithPrefix{
+ Address: tcpip.Address(net.ParseIP("192.168.0.1").To4()),
+ PrefixLen: 24,
+ },
+ }
+ host2IPv4Addr = tcpip.ProtocolAddress{
+ Protocol: ipv4.ProtocolNumber,
+ AddressWithPrefix: tcpip.AddressWithPrefix{
+ Address: tcpip.Address(net.ParseIP("192.168.0.2").To4()),
+ PrefixLen: 24,
+ },
+ }
+ )
+ const icmpBurst = 5
+ e := channel.New(1, defaultMTU, tcpip.LinkAddress(""))
+ s := stack.New(stack.Options{
+ NetworkProtocols: []stack.NetworkProtocolFactory{arp.NewProtocol, ipv4.NewProtocol},
+ TransportProtocols: []stack.TransportProtocolFactory{udp.NewProtocol},
+ Clock: faketime.NewManualClock(),
+ })
+ s.SetICMPBurst(icmpBurst)
+
+ if err := s.CreateNIC(nicID, e); err != nil {
+ t.Fatalf("s.CreateNIC(%d, _): %s", nicID, err)
+ }
+ if err := s.AddProtocolAddress(nicID, host1IPv4Addr, stack.AddressProperties{}); err != nil {
+ t.Fatalf("s.AddProtocolAddress(%d, %+v, {}): %s", nicID, host1IPv4Addr, err)
+ }
+ s.SetRouteTable([]tcpip.Route{
+ {
+ Destination: host1IPv4Addr.AddressWithPrefix.Subnet(),
+ NIC: nicID,
+ },
+ })
+ tests := []struct {
+ name string
+ createPacket func() buffer.View
+ check func(*testing.T, *channel.Endpoint, int)
+ }{
+ {
+ name: "echo",
+ createPacket: func() buffer.View {
+ totalLength := header.IPv4MinimumSize + header.ICMPv4MinimumSize
+ hdr := buffer.NewPrependable(totalLength)
+ icmpH := header.ICMPv4(hdr.Prepend(header.ICMPv4MinimumSize))
+ icmpH.SetIdent(1)
+ icmpH.SetSequence(1)
+ icmpH.SetType(header.ICMPv4Echo)
+ icmpH.SetCode(header.ICMPv4UnusedCode)
+ icmpH.SetChecksum(0)
+ icmpH.SetChecksum(^header.Checksum(icmpH, 0))
+ ip := header.IPv4(hdr.Prepend(header.IPv4MinimumSize))
+ ip.Encode(&header.IPv4Fields{
+ TotalLength: uint16(totalLength),
+ Protocol: uint8(header.ICMPv4ProtocolNumber),
+ TTL: 1,
+ SrcAddr: host2IPv4Addr.AddressWithPrefix.Address,
+ DstAddr: host1IPv4Addr.AddressWithPrefix.Address,
+ })
+ ip.SetChecksum(^ip.CalculateChecksum())
+ return hdr.View()
+ },
+ check: func(t *testing.T, e *channel.Endpoint, round int) {
+ p, ok := e.Read()
+ if !ok {
+ t.Fatalf("expected echo response, no packet read in endpoint in round %d", round)
+ }
+ if got, want := p.Proto, header.IPv4ProtocolNumber; got != want {
+ t.Errorf("got p.Proto = %d, want = %d", got, want)
+ }
+ checker.IPv4(t, stack.PayloadSince(p.Pkt.NetworkHeader()),
+ checker.SrcAddr(host1IPv4Addr.AddressWithPrefix.Address),
+ checker.DstAddr(host2IPv4Addr.AddressWithPrefix.Address),
+ checker.ICMPv4(
+ checker.ICMPv4Type(header.ICMPv4EchoReply),
+ ))
+ },
+ },
+ {
+ name: "dst unreachable",
+ createPacket: func() buffer.View {
+ totalLength := header.IPv4MinimumSize + header.UDPMinimumSize
+ hdr := buffer.NewPrependable(totalLength)
+ udpH := header.UDP(hdr.Prepend(header.UDPMinimumSize))
+ udpH.Encode(&header.UDPFields{
+ SrcPort: 100,
+ DstPort: 101,
+ Length: header.UDPMinimumSize,
+ })
+ ip := header.IPv4(hdr.Prepend(header.IPv4MinimumSize))
+ ip.Encode(&header.IPv4Fields{
+ TotalLength: uint16(totalLength),
+ Protocol: uint8(header.UDPProtocolNumber),
+ TTL: 1,
+ SrcAddr: host2IPv4Addr.AddressWithPrefix.Address,
+ DstAddr: host1IPv4Addr.AddressWithPrefix.Address,
+ })
+ ip.SetChecksum(^ip.CalculateChecksum())
+ return hdr.View()
+ },
+ check: func(t *testing.T, e *channel.Endpoint, round int) {
+ p, ok := e.Read()
+ if round >= icmpBurst {
+ if ok {
+ t.Errorf("got packet %x in round %d, expected ICMP rate limit to stop it", p.Pkt.Data().Views(), round)
+ }
+ return
+ }
+ if !ok {
+ t.Fatalf("expected unreachable in round %d, no packet read in endpoint", round)
+ }
+ checker.IPv4(t, stack.PayloadSince(p.Pkt.NetworkHeader()),
+ checker.SrcAddr(host1IPv4Addr.AddressWithPrefix.Address),
+ checker.DstAddr(host2IPv4Addr.AddressWithPrefix.Address),
+ checker.ICMPv4(
+ checker.ICMPv4Type(header.ICMPv4DstUnreachable),
+ ))
+ },
+ },
+ }
+ for _, testCase := range tests {
+ t.Run(testCase.name, func(t *testing.T) {
+ for round := 0; round < icmpBurst+1; round++ {
+ e.InjectInbound(header.IPv4ProtocolNumber, stack.NewPacketBuffer(stack.PacketBufferOptions{
+ Data: testCase.createPacket().ToVectorisedView(),
+ }))
+ testCase.check(t, e, round)
+ }
+ })
+ }
+}
diff --git a/pkg/tcpip/network/ipv6/BUILD b/pkg/tcpip/network/ipv6/BUILD
index f99cbf8f3..f814926a3 100644
--- a/pkg/tcpip/network/ipv6/BUILD
+++ b/pkg/tcpip/network/ipv6/BUILD
@@ -51,6 +51,7 @@ go_test(
"//pkg/tcpip/transport/udp",
"//pkg/waiter",
"@com_github_google_go_cmp//cmp:go_default_library",
+ "@org_golang_x_time//rate:go_default_library",
],
)
diff --git a/pkg/tcpip/network/ipv6/icmp.go b/pkg/tcpip/network/ipv6/icmp.go
index 94caaae6c..6c6107264 100644
--- a/pkg/tcpip/network/ipv6/icmp.go
+++ b/pkg/tcpip/network/ipv6/icmp.go
@@ -692,6 +692,11 @@ func (e *endpoint) handleICMP(pkt *stack.PacketBuffer, hasFragmentHeader bool, r
}
defer r.Release()
+ if !e.protocol.allowICMPReply(header.ICMPv6EchoReply) {
+ sent.rateLimited.Increment()
+ return
+ }
+
replyPkt := stack.NewPacketBuffer(stack.PacketBufferOptions{
ReserveHeaderBytes: int(r.MaxHeaderLength()) + header.ICMPv6EchoMinimumSize,
Data: pkt.Data().ExtractVV(),
@@ -1174,13 +1179,6 @@ func (p *protocol) returnError(reason icmpReason, pkt *stack.PacketBuffer) tcpip
return &tcpip.ErrNotConnected{}
}
- sent := netEP.stats.icmp.packetsSent
-
- if !p.stack.AllowICMPMessage() {
- sent.rateLimited.Increment()
- return nil
- }
-
if pkt.TransportProtocolNumber == header.ICMPv6ProtocolNumber {
// TODO(gvisor.dev/issues/3810): Sort this out when ICMP headers are stored.
// Unfortunately at this time ICMP Packets do not have a transport
@@ -1198,6 +1196,33 @@ func (p *protocol) returnError(reason icmpReason, pkt *stack.PacketBuffer) tcpip
}
}
+ sent := netEP.stats.icmp.packetsSent
+ icmpType, icmpCode, counter, typeSpecific := func() (header.ICMPv6Type, header.ICMPv6Code, tcpip.MultiCounterStat, uint32) {
+ switch reason := reason.(type) {
+ case *icmpReasonParameterProblem:
+ return header.ICMPv6ParamProblem, reason.code, sent.paramProblem, reason.pointer
+ case *icmpReasonPortUnreachable:
+ return header.ICMPv6DstUnreachable, header.ICMPv6PortUnreachable, sent.dstUnreachable, 0
+ case *icmpReasonNetUnreachable:
+ return header.ICMPv6DstUnreachable, header.ICMPv6NetworkUnreachable, sent.dstUnreachable, 0
+ case *icmpReasonHostUnreachable:
+ return header.ICMPv6DstUnreachable, header.ICMPv6AddressUnreachable, sent.dstUnreachable, 0
+ case *icmpReasonPacketTooBig:
+ return header.ICMPv6PacketTooBig, header.ICMPv6UnusedCode, sent.packetTooBig, 0
+ case *icmpReasonHopLimitExceeded:
+ return header.ICMPv6TimeExceeded, header.ICMPv6HopLimitExceeded, sent.timeExceeded, 0
+ case *icmpReasonReassemblyTimeout:
+ return header.ICMPv6TimeExceeded, header.ICMPv6ReassemblyTimeout, sent.timeExceeded, 0
+ default:
+ panic(fmt.Sprintf("unsupported ICMP type %T", reason))
+ }
+ }()
+
+ if !p.allowICMPReply(icmpType) {
+ sent.rateLimited.Increment()
+ return nil
+ }
+
network, transport := pkt.NetworkHeader().View(), pkt.TransportHeader().View()
// As per RFC 4443 section 2.4
@@ -1232,40 +1257,10 @@ func (p *protocol) returnError(reason icmpReason, pkt *stack.PacketBuffer) tcpip
newPkt.TransportProtocolNumber = header.ICMPv6ProtocolNumber
icmpHdr := header.ICMPv6(newPkt.TransportHeader().Push(header.ICMPv6DstUnreachableMinimumSize))
- var counter tcpip.MultiCounterStat
- switch reason := reason.(type) {
- case *icmpReasonParameterProblem:
- icmpHdr.SetType(header.ICMPv6ParamProblem)
- icmpHdr.SetCode(reason.code)
- icmpHdr.SetTypeSpecific(reason.pointer)
- counter = sent.paramProblem
- case *icmpReasonPortUnreachable:
- icmpHdr.SetType(header.ICMPv6DstUnreachable)
- icmpHdr.SetCode(header.ICMPv6PortUnreachable)
- counter = sent.dstUnreachable
- case *icmpReasonNetUnreachable:
- icmpHdr.SetType(header.ICMPv6DstUnreachable)
- icmpHdr.SetCode(header.ICMPv6NetworkUnreachable)
- counter = sent.dstUnreachable
- case *icmpReasonHostUnreachable:
- icmpHdr.SetType(header.ICMPv6DstUnreachable)
- icmpHdr.SetCode(header.ICMPv6AddressUnreachable)
- counter = sent.dstUnreachable
- case *icmpReasonPacketTooBig:
- icmpHdr.SetType(header.ICMPv6PacketTooBig)
- icmpHdr.SetCode(header.ICMPv6UnusedCode)
- counter = sent.packetTooBig
- case *icmpReasonHopLimitExceeded:
- icmpHdr.SetType(header.ICMPv6TimeExceeded)
- icmpHdr.SetCode(header.ICMPv6HopLimitExceeded)
- counter = sent.timeExceeded
- case *icmpReasonReassemblyTimeout:
- icmpHdr.SetType(header.ICMPv6TimeExceeded)
- icmpHdr.SetCode(header.ICMPv6ReassemblyTimeout)
- counter = sent.timeExceeded
- default:
- panic(fmt.Sprintf("unsupported ICMP type %T", reason))
- }
+ icmpHdr.SetType(icmpType)
+ icmpHdr.SetCode(icmpCode)
+ icmpHdr.SetTypeSpecific(typeSpecific)
+
dataRange := newPkt.Data().AsRange()
icmpHdr.SetChecksum(header.ICMPv6Checksum(header.ICMPv6ChecksumParams{
Header: icmpHdr,
diff --git a/pkg/tcpip/network/ipv6/icmp_test.go b/pkg/tcpip/network/ipv6/icmp_test.go
index 3b4c235fa..03d9f425c 100644
--- a/pkg/tcpip/network/ipv6/icmp_test.go
+++ b/pkg/tcpip/network/ipv6/icmp_test.go
@@ -22,6 +22,7 @@ import (
"testing"
"github.com/google/go-cmp/cmp"
+ "golang.org/x/time/rate"
"gvisor.dev/gvisor/pkg/tcpip"
"gvisor.dev/gvisor/pkg/tcpip/buffer"
"gvisor.dev/gvisor/pkg/tcpip/checker"
@@ -1435,6 +1436,8 @@ func TestPacketQueing(t *testing.T) {
TransportProtocols: []stack.TransportProtocolFactory{udp.NewProtocol},
Clock: clock,
})
+ // Make sure ICMP rate limiting doesn't get in our way.
+ s.SetICMPLimit(rate.Inf)
if err := s.CreateNIC(nicID, e); err != nil {
t.Fatalf("s.CreateNIC(%d, _): %s", nicID, err)
diff --git a/pkg/tcpip/network/ipv6/ipv6.go b/pkg/tcpip/network/ipv6/ipv6.go
index 3799d8245..dab99d00d 100644
--- a/pkg/tcpip/network/ipv6/ipv6.go
+++ b/pkg/tcpip/network/ipv6/ipv6.go
@@ -1990,6 +1990,9 @@ type protocol struct {
// eps is keyed by NICID to allow protocol methods to retrieve an endpoint
// when handling a packet, by looking at which NIC handled the packet.
eps map[tcpip.NICID]*endpoint
+
+ // ICMP types for which the stack's global rate limiting must apply.
+ icmpRateLimitedTypes map[header.ICMPv6Type]struct{}
}
ids []uint32
@@ -2001,7 +2004,8 @@ type protocol struct {
// Must be accessed using atomic operations.
defaultTTL uint32
- fragmentation *fragmentation.Fragmentation
+ fragmentation *fragmentation.Fragmentation
+ icmpRateLimiter *stack.ICMPRateLimiter
}
// Number returns the ipv6 protocol number.
@@ -2177,6 +2181,18 @@ func (*protocol) Parse(pkt *stack.PacketBuffer) (proto tcpip.TransportProtocolNu
return proto, !fragMore && fragOffset == 0, true
}
+// allowICMPReply reports whether an ICMP reply with provided type may
+// be sent following the rate mask options and global ICMP rate limiter.
+func (p *protocol) allowICMPReply(icmpType header.ICMPv6Type) bool {
+ p.mu.RLock()
+ defer p.mu.RUnlock()
+
+ if _, ok := p.mu.icmpRateLimitedTypes[icmpType]; ok {
+ return p.stack.AllowICMPMessage()
+ }
+ return true
+}
+
// calculateNetworkMTU calculates the network-layer payload MTU based on the
// link-layer payload MTU and the length of every IPv6 header.
// Note that this is different than the Payload Length field of the IPv6 header,
@@ -2273,6 +2289,21 @@ func NewProtocolWithOptions(opts Options) stack.NetworkProtocolFactory {
p.fragmentation = fragmentation.NewFragmentation(header.IPv6FragmentExtHdrFragmentOffsetBytesPerUnit, fragmentation.HighFragThreshold, fragmentation.LowFragThreshold, ReassembleTimeout, s.Clock(), p)
p.mu.eps = make(map[tcpip.NICID]*endpoint)
p.SetDefaultTTL(DefaultTTL)
+ // Set default ICMP rate limiting to Linux defaults.
+ //
+ // Default: 0-1,3-127 (rate limit ICMPv6 errors except Packet Too Big)
+ // See https://www.kernel.org/doc/Documentation/networking/ip-sysctl.txt.
+ defaultIcmpTypes := make(map[header.ICMPv6Type]struct{})
+ for i := header.ICMPv6Type(0); i < header.ICMPv6EchoRequest; i++ {
+ switch i {
+ case header.ICMPv6PacketTooBig:
+ // Do not rate limit packet too big by default.
+ default:
+ defaultIcmpTypes[i] = struct{}{}
+ }
+ }
+ p.mu.icmpRateLimitedTypes = defaultIcmpTypes
+
return p
}
}
diff --git a/pkg/tcpip/network/ipv6/ipv6_test.go b/pkg/tcpip/network/ipv6/ipv6_test.go
index 74f19900c..e5286081e 100644
--- a/pkg/tcpip/network/ipv6/ipv6_test.go
+++ b/pkg/tcpip/network/ipv6/ipv6_test.go
@@ -3522,3 +3522,149 @@ func TestMultiCounterStatsInitialization(t *testing.T) {
t.Error(err)
}
}
+
+func TestIcmpRateLimit(t *testing.T) {
+ var (
+ host1IPv6Addr = tcpip.ProtocolAddress{
+ Protocol: ProtocolNumber,
+ AddressWithPrefix: tcpip.AddressWithPrefix{
+ Address: tcpip.Address(net.ParseIP("10::1").To16()),
+ PrefixLen: 64,
+ },
+ }
+ host2IPv6Addr = tcpip.ProtocolAddress{
+ Protocol: ProtocolNumber,
+ AddressWithPrefix: tcpip.AddressWithPrefix{
+ Address: tcpip.Address(net.ParseIP("10::2").To16()),
+ PrefixLen: 64,
+ },
+ }
+ )
+ const icmpBurst = 5
+ e := channel.New(1, defaultMTU, tcpip.LinkAddress(""))
+ s := stack.New(stack.Options{
+ NetworkProtocols: []stack.NetworkProtocolFactory{NewProtocol},
+ TransportProtocols: []stack.TransportProtocolFactory{udp.NewProtocol},
+ Clock: faketime.NewManualClock(),
+ })
+ s.SetICMPBurst(icmpBurst)
+
+ if err := s.CreateNIC(nicID, e); err != nil {
+ t.Fatalf("s.CreateNIC(%d, _): %s", nicID, err)
+ }
+ if err := s.AddProtocolAddress(nicID, host1IPv6Addr, stack.AddressProperties{}); err != nil {
+ t.Fatalf("s.AddProtocolAddress(%d, %+v, {}): %s", nicID, host1IPv6Addr, err)
+ }
+ s.SetRouteTable([]tcpip.Route{
+ {
+ Destination: host1IPv6Addr.AddressWithPrefix.Subnet(),
+ NIC: nicID,
+ },
+ })
+ tests := []struct {
+ name string
+ createPacket func() buffer.View
+ check func(*testing.T, *channel.Endpoint, int)
+ }{
+ {
+ name: "echo",
+ createPacket: func() buffer.View {
+ totalLength := header.IPv6MinimumSize + header.ICMPv6MinimumSize
+ hdr := buffer.NewPrependable(totalLength)
+ icmpH := header.ICMPv6(hdr.Prepend(header.ICMPv6MinimumSize))
+ icmpH.SetIdent(1)
+ icmpH.SetSequence(1)
+ icmpH.SetType(header.ICMPv6EchoRequest)
+ icmpH.SetCode(header.ICMPv6UnusedCode)
+ icmpH.SetChecksum(0)
+ icmpH.SetChecksum(header.ICMPv6Checksum(header.ICMPv6ChecksumParams{
+ Header: icmpH,
+ Src: host2IPv6Addr.AddressWithPrefix.Address,
+ Dst: host1IPv6Addr.AddressWithPrefix.Address,
+ }))
+ payloadLength := hdr.UsedLength()
+ ip := header.IPv6(hdr.Prepend(header.IPv6MinimumSize))
+ ip.Encode(&header.IPv6Fields{
+ PayloadLength: uint16(payloadLength),
+ TransportProtocol: header.ICMPv6ProtocolNumber,
+ HopLimit: 1,
+ SrcAddr: host2IPv6Addr.AddressWithPrefix.Address,
+ DstAddr: host1IPv6Addr.AddressWithPrefix.Address,
+ })
+ return hdr.View()
+ },
+ check: func(t *testing.T, e *channel.Endpoint, round int) {
+ p, ok := e.Read()
+ if !ok {
+ t.Fatalf("expected echo response, no packet read in endpoint in round %d", round)
+ }
+ if got, want := p.Proto, header.IPv6ProtocolNumber; got != want {
+ t.Errorf("got p.Proto = %d, want = %d", got, want)
+ }
+ checker.IPv6(t, stack.PayloadSince(p.Pkt.NetworkHeader()),
+ checker.SrcAddr(host1IPv6Addr.AddressWithPrefix.Address),
+ checker.DstAddr(host2IPv6Addr.AddressWithPrefix.Address),
+ checker.ICMPv6(
+ checker.ICMPv6Type(header.ICMPv6EchoReply),
+ ))
+ },
+ },
+ {
+ name: "dst unreachable",
+ createPacket: func() buffer.View {
+ totalLength := header.IPv6MinimumSize + header.UDPMinimumSize
+ hdr := buffer.NewPrependable(totalLength)
+ udpH := header.UDP(hdr.Prepend(header.UDPMinimumSize))
+ udpH.Encode(&header.UDPFields{
+ SrcPort: 100,
+ DstPort: 101,
+ Length: header.UDPMinimumSize,
+ })
+
+ // Calculate the UDP checksum and set it.
+ sum := header.PseudoHeaderChecksum(udp.ProtocolNumber, host2IPv6Addr.AddressWithPrefix.Address, host1IPv6Addr.AddressWithPrefix.Address, header.UDPMinimumSize)
+ sum = header.Checksum(nil, sum)
+ udpH.SetChecksum(^udpH.CalculateChecksum(sum))
+
+ payloadLength := hdr.UsedLength()
+ ip := header.IPv6(hdr.Prepend(header.IPv6MinimumSize))
+ ip.Encode(&header.IPv6Fields{
+ PayloadLength: uint16(payloadLength),
+ TransportProtocol: header.UDPProtocolNumber,
+ HopLimit: 1,
+ SrcAddr: host2IPv6Addr.AddressWithPrefix.Address,
+ DstAddr: host1IPv6Addr.AddressWithPrefix.Address,
+ })
+ return hdr.View()
+ },
+ check: func(t *testing.T, e *channel.Endpoint, round int) {
+ p, ok := e.Read()
+ if round >= icmpBurst {
+ if ok {
+ t.Errorf("got packet %x in round %d, expected ICMP rate limit to stop it", p.Pkt.Data().Views(), round)
+ }
+ return
+ }
+ if !ok {
+ t.Fatalf("expected unreachable in round %d, no packet read in endpoint", round)
+ }
+ checker.IPv6(t, stack.PayloadSince(p.Pkt.NetworkHeader()),
+ checker.SrcAddr(host1IPv6Addr.AddressWithPrefix.Address),
+ checker.DstAddr(host2IPv6Addr.AddressWithPrefix.Address),
+ checker.ICMPv6(
+ checker.ICMPv6Type(header.ICMPv6DstUnreachable),
+ ))
+ },
+ },
+ }
+ for _, testCase := range tests {
+ t.Run(testCase.name, func(t *testing.T) {
+ for round := 0; round < icmpBurst+1; round++ {
+ e.InjectInbound(header.IPv6ProtocolNumber, stack.NewPacketBuffer(stack.PacketBufferOptions{
+ Data: testCase.createPacket().ToVectorisedView(),
+ }))
+ testCase.check(t, e, round)
+ }
+ })
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 23:02:50 +0000