summaryrefslogtreecommitdiffhomepage
path: root/pkg/tcpip/transport
diff options
context:
space:
mode:
Diffstat (limited to 'pkg/tcpip/transport')
-rw-r--r--pkg/tcpip/transport/icmp/endpoint.go28
-rw-r--r--pkg/tcpip/transport/raw/endpoint.go2
-rw-r--r--pkg/tcpip/transport/tcp/accept.go2
-rw-r--r--pkg/tcpip/transport/tcp/connect.go20
-rw-r--r--pkg/tcpip/transport/tcp/endpoint.go13
-rw-r--r--pkg/tcpip/transport/tcp/tcp_test.go28
-rw-r--r--pkg/tcpip/transport/udp/endpoint.go24
-rw-r--r--pkg/tcpip/transport/udp/protocol.go4
-rw-r--r--pkg/tcpip/transport/udp/udp_test.go33
9 files changed, 131 insertions, 23 deletions
diff --git a/pkg/tcpip/transport/icmp/endpoint.go b/pkg/tcpip/transport/icmp/endpoint.go
index a3a910d41..e17e737e4 100644
--- a/pkg/tcpip/transport/icmp/endpoint.go
+++ b/pkg/tcpip/transport/icmp/endpoint.go
@@ -84,6 +84,7 @@ type endpoint struct {
// NIC.
regNICID tcpip.NICID
route stack.Route `state:"manual"`
+ ttl uint8
}
func newEndpoint(stack *stack.Stack, netProto tcpip.NetworkProtocolNumber, transProto tcpip.TransportProtocolNumber, waiterQueue *waiter.Queue) (tcpip.Endpoint, *tcpip.Error) {
@@ -296,10 +297,10 @@ func (e *endpoint) Write(p tcpip.Payloader, opts tcpip.WriteOptions) (int64, <-c
switch e.netProto {
case header.IPv4ProtocolNumber:
- err = send4(route, e.id.LocalPort, v)
+ err = send4(route, e.id.LocalPort, v, e.ttl)
case header.IPv6ProtocolNumber:
- err = send6(route, e.id.LocalPort, v)
+ err = send6(route, e.id.LocalPort, v, e.ttl)
}
if err != nil {
@@ -314,8 +315,15 @@ func (e *endpoint) Peek([][]byte) (int64, tcpip.ControlMessages, *tcpip.Error) {
return 0, tcpip.ControlMessages{}, nil
}
-// SetSockOpt sets a socket option. Currently not supported.
+// SetSockOpt sets a socket option.
func (e *endpoint) SetSockOpt(opt interface{}) *tcpip.Error {
+ switch o := opt.(type) {
+ case tcpip.TTLOption:
+ e.mu.Lock()
+ e.ttl = uint8(o)
+ e.mu.Unlock()
+ }
+
return nil
}
@@ -362,12 +370,18 @@ func (e *endpoint) GetSockOpt(opt interface{}) *tcpip.Error {
*o = 0
return nil
+ case *tcpip.TTLOption:
+ e.rcvMu.Lock()
+ *o = tcpip.TTLOption(e.ttl)
+ e.rcvMu.Unlock()
+ return nil
+
default:
return tcpip.ErrUnknownProtocolOption
}
}
-func send4(r *stack.Route, ident uint16, data buffer.View) *tcpip.Error {
+func send4(r *stack.Route, ident uint16, data buffer.View, ttl uint8) *tcpip.Error {
if len(data) < header.ICMPv4MinimumSize {
return tcpip.ErrInvalidEndpointState
}
@@ -389,10 +403,10 @@ func send4(r *stack.Route, ident uint16, data buffer.View) *tcpip.Error {
icmpv4.SetChecksum(0)
icmpv4.SetChecksum(^header.Checksum(icmpv4, header.Checksum(data, 0)))
- return r.WritePacket(nil /* gso */, hdr, data.ToVectorisedView(), header.ICMPv4ProtocolNumber, r.DefaultTTL())
+ return r.WritePacket(nil /* gso */, hdr, data.ToVectorisedView(), header.ICMPv4ProtocolNumber, ttl, ttl == 0 /* useDefaultTTL */)
}
-func send6(r *stack.Route, ident uint16, data buffer.View) *tcpip.Error {
+func send6(r *stack.Route, ident uint16, data buffer.View, ttl uint8) *tcpip.Error {
if len(data) < header.ICMPv6EchoMinimumSize {
return tcpip.ErrInvalidEndpointState
}
@@ -412,7 +426,7 @@ func send6(r *stack.Route, ident uint16, data buffer.View) *tcpip.Error {
icmpv6.SetChecksum(0)
icmpv6.SetChecksum(^header.Checksum(icmpv6, header.Checksum(data, 0)))
- return r.WritePacket(nil /* gso */, hdr, data.ToVectorisedView(), header.ICMPv6ProtocolNumber, r.DefaultTTL())
+ return r.WritePacket(nil /* gso */, hdr, data.ToVectorisedView(), header.ICMPv6ProtocolNumber, ttl, ttl == 0 /* useDefaultTTL */)
}
func (e *endpoint) checkV4Mapped(addr *tcpip.FullAddress, allowMismatch bool) (tcpip.NetworkProtocolNumber, *tcpip.Error) {
diff --git a/pkg/tcpip/transport/raw/endpoint.go b/pkg/tcpip/transport/raw/endpoint.go
index a02731a5d..8ae132efa 100644
--- a/pkg/tcpip/transport/raw/endpoint.go
+++ b/pkg/tcpip/transport/raw/endpoint.go
@@ -332,7 +332,7 @@ func (ep *endpoint) finishWrite(payloadBytes []byte, route *stack.Route) (int64,
break
}
hdr := buffer.NewPrependable(len(payloadBytes) + int(route.MaxHeaderLength()))
- if err := route.WritePacket(nil /* gso */, hdr, buffer.View(payloadBytes).ToVectorisedView(), ep.transProto, route.DefaultTTL()); err != nil {
+ if err := route.WritePacket(nil /* gso */, hdr, buffer.View(payloadBytes).ToVectorisedView(), ep.transProto, 0, true /* useDefaultTTL */); err != nil {
return 0, nil, err
}
diff --git a/pkg/tcpip/transport/tcp/accept.go b/pkg/tcpip/transport/tcp/accept.go
index 3ae4a5426..b8b4bcee8 100644
--- a/pkg/tcpip/transport/tcp/accept.go
+++ b/pkg/tcpip/transport/tcp/accept.go
@@ -439,7 +439,7 @@ func (e *endpoint) handleListenSegment(ctx *listenContext, s *segment) {
TSEcr: opts.TSVal,
MSS: uint16(mss),
}
- sendSynTCP(&s.route, s.id, header.TCPFlagSyn|header.TCPFlagAck, cookie, s.sequenceNumber+1, ctx.rcvWnd, synOpts)
+ sendSynTCP(&s.route, s.id, e.ttl, header.TCPFlagSyn|header.TCPFlagAck, cookie, s.sequenceNumber+1, ctx.rcvWnd, synOpts)
e.stack.Stats().TCP.ListenOverflowSynCookieSent.Increment()
}
diff --git a/pkg/tcpip/transport/tcp/connect.go b/pkg/tcpip/transport/tcp/connect.go
index 21038a65a..1d6e7f5f3 100644
--- a/pkg/tcpip/transport/tcp/connect.go
+++ b/pkg/tcpip/transport/tcp/connect.go
@@ -238,6 +238,7 @@ func (h *handshake) synSentState(s *segment) *tcpip.Error {
h.state = handshakeSynRcvd
h.ep.mu.Lock()
h.ep.state = StateSynRecv
+ ttl := h.ep.ttl
h.ep.mu.Unlock()
synOpts := header.TCPSynOptions{
WS: int(h.effectiveRcvWndScale()),
@@ -251,7 +252,10 @@ func (h *handshake) synSentState(s *segment) *tcpip.Error {
SACKPermitted: rcvSynOpts.SACKPermitted,
MSS: h.ep.amss,
}
- sendSynTCP(&s.route, h.ep.id, h.flags, h.iss, h.ackNum, h.rcvWnd, synOpts)
+ if ttl == 0 {
+ ttl = s.route.DefaultTTL()
+ }
+ sendSynTCP(&s.route, h.ep.id, ttl, h.flags, h.iss, h.ackNum, h.rcvWnd, synOpts)
return nil
}
@@ -296,7 +300,7 @@ func (h *handshake) synRcvdState(s *segment) *tcpip.Error {
SACKPermitted: h.ep.sackPermitted,
MSS: h.ep.amss,
}
- sendSynTCP(&s.route, h.ep.id, h.flags, h.iss, h.ackNum, h.rcvWnd, synOpts)
+ sendSynTCP(&s.route, h.ep.id, h.ep.ttl, h.flags, h.iss, h.ackNum, h.rcvWnd, synOpts)
return nil
}
@@ -460,7 +464,7 @@ func (h *handshake) execute() *tcpip.Error {
synOpts.WS = -1
}
}
- sendSynTCP(&h.ep.route, h.ep.id, h.flags, h.iss, h.ackNum, h.rcvWnd, synOpts)
+ sendSynTCP(&h.ep.route, h.ep.id, h.ep.ttl, h.flags, h.iss, h.ackNum, h.rcvWnd, synOpts)
for h.state != handshakeCompleted {
switch index, _ := s.Fetch(true); index {
case wakerForResend:
@@ -469,7 +473,7 @@ func (h *handshake) execute() *tcpip.Error {
return tcpip.ErrTimeout
}
rt.Reset(timeOut)
- sendSynTCP(&h.ep.route, h.ep.id, h.flags, h.iss, h.ackNum, h.rcvWnd, synOpts)
+ sendSynTCP(&h.ep.route, h.ep.id, h.ep.ttl, h.flags, h.iss, h.ackNum, h.rcvWnd, synOpts)
case wakerForNotification:
n := h.ep.fetchNotifications()
@@ -579,9 +583,9 @@ func makeSynOptions(opts header.TCPSynOptions) []byte {
return options[:offset]
}
-func sendSynTCP(r *stack.Route, id stack.TransportEndpointID, flags byte, seq, ack seqnum.Value, rcvWnd seqnum.Size, opts header.TCPSynOptions) *tcpip.Error {
+func sendSynTCP(r *stack.Route, id stack.TransportEndpointID, ttl uint8, flags byte, seq, ack seqnum.Value, rcvWnd seqnum.Size, opts header.TCPSynOptions) *tcpip.Error {
options := makeSynOptions(opts)
- err := sendTCP(r, id, buffer.VectorisedView{}, r.DefaultTTL(), flags, seq, ack, rcvWnd, options, nil)
+ err := sendTCP(r, id, buffer.VectorisedView{}, ttl, flags, seq, ack, rcvWnd, options, nil)
putOptions(options)
return err
}
@@ -629,7 +633,7 @@ func sendTCP(r *stack.Route, id stack.TransportEndpointID, data buffer.Vectorise
r.Stats().TCP.ResetsSent.Increment()
}
- return r.WritePacket(gso, hdr, data, ProtocolNumber, ttl)
+ return r.WritePacket(gso, hdr, data, ProtocolNumber, ttl, ttl == 0 /* useDefaultTTL */)
}
// makeOptions makes an options slice.
@@ -678,7 +682,7 @@ func (e *endpoint) sendRaw(data buffer.VectorisedView, flags byte, seq, ack seqn
sackBlocks = e.sack.Blocks[:e.sack.NumBlocks]
}
options := e.makeOptions(sackBlocks)
- err := sendTCP(&e.route, e.id, data, e.route.DefaultTTL(), flags, seq, ack, rcvWnd, options, e.gso)
+ err := sendTCP(&e.route, e.id, data, e.ttl, flags, seq, ack, rcvWnd, options, e.gso)
putOptions(options)
return err
}
diff --git a/pkg/tcpip/transport/tcp/endpoint.go b/pkg/tcpip/transport/tcp/endpoint.go
index f9d5e0085..83d92b3e1 100644
--- a/pkg/tcpip/transport/tcp/endpoint.go
+++ b/pkg/tcpip/transport/tcp/endpoint.go
@@ -228,6 +228,7 @@ type endpoint struct {
isRegistered bool
boundNICID tcpip.NICID `state:"manual"`
route stack.Route `state:"manual"`
+ ttl uint8
v6only bool
isConnectNotified bool
// TCP should never broadcast but Linux nevertheless supports enabling/
@@ -1116,6 +1117,12 @@ func (e *endpoint) SetSockOpt(opt interface{}) *tcpip.Error {
e.v6only = v != 0
return nil
+ case tcpip.TTLOption:
+ e.mu.Lock()
+ e.ttl = uint8(v)
+ e.mu.Unlock()
+ return nil
+
case tcpip.KeepaliveEnabledOption:
e.keepalive.Lock()
e.keepalive.enabled = v != 0
@@ -1313,6 +1320,12 @@ func (e *endpoint) GetSockOpt(opt interface{}) *tcpip.Error {
}
return nil
+ case *tcpip.TTLOption:
+ e.mu.Lock()
+ *o = tcpip.TTLOption(e.ttl)
+ e.mu.Unlock()
+ return nil
+
case *tcpip.TCPInfoOption:
*o = tcpip.TCPInfoOption{}
e.mu.RLock()
diff --git a/pkg/tcpip/transport/tcp/tcp_test.go b/pkg/tcpip/transport/tcp/tcp_test.go
index 089826a88..a86123829 100644
--- a/pkg/tcpip/transport/tcp/tcp_test.go
+++ b/pkg/tcpip/transport/tcp/tcp_test.go
@@ -1752,6 +1752,34 @@ func TestSendGreaterThanMTU(t *testing.T) {
testBrokenUpWrite(t, c, maxPayload)
}
+func TestSetTTL(t *testing.T) {
+ for _, wantTTL := range []uint8{1, 2, 50, 64, 128, 254, 255} {
+ t.Run(fmt.Sprintf("TTL:%d", wantTTL), func(t *testing.T) {
+ c := context.New(t, 65535)
+ defer c.Cleanup()
+
+ var err *tcpip.Error
+ c.EP, err = c.Stack().NewEndpoint(tcp.ProtocolNumber, ipv4.ProtocolNumber, &waiter.Queue{})
+ if err != nil {
+ t.Fatalf("NewEndpoint failed: %v", err)
+ }
+
+ if err := c.EP.SetSockOpt(tcpip.TTLOption(wantTTL)); err != nil {
+ t.Fatalf("SetSockOpt failed: %v", err)
+ }
+
+ if err := c.EP.Connect(tcpip.FullAddress{Addr: context.TestAddr, Port: context.TestPort}); err != tcpip.ErrConnectStarted {
+ t.Fatalf("Unexpected return value from Connect: %v", err)
+ }
+
+ // Receive SYN packet.
+ b := c.GetPacket()
+
+ checker.IPv4(t, b, checker.TTL(wantTTL))
+ })
+ }
+}
+
func TestActiveSendMSSLessThanMTU(t *testing.T) {
const maxPayload = 100
c := context.New(t, 65535)
diff --git a/pkg/tcpip/transport/udp/endpoint.go b/pkg/tcpip/transport/udp/endpoint.go
index 52f5af777..8ae83437e 100644
--- a/pkg/tcpip/transport/udp/endpoint.go
+++ b/pkg/tcpip/transport/udp/endpoint.go
@@ -83,6 +83,7 @@ type endpoint struct {
route stack.Route `state:"manual"`
dstPort uint16
v6only bool
+ ttl uint8
multicastTTL uint8
multicastAddr tcpip.Address
multicastNICID tcpip.NICID
@@ -374,12 +375,16 @@ func (e *endpoint) Write(p tcpip.Payloader, opts tcpip.WriteOptions) (int64, <-c
return 0, nil, tcpip.ErrMessageTooLong
}
- ttl := route.DefaultTTL()
+ ttl := e.ttl
+ useDefaultTTL := ttl == 0
+
if header.IsV4MulticastAddress(route.RemoteAddress) || header.IsV6MulticastAddress(route.RemoteAddress) {
ttl = e.multicastTTL
+ // Multicast allows a 0 TTL.
+ useDefaultTTL = false
}
- if err := sendUDP(route, buffer.View(v).ToVectorisedView(), e.id.LocalPort, dstPort, ttl); err != nil {
+ if err := sendUDP(route, buffer.View(v).ToVectorisedView(), e.id.LocalPort, dstPort, ttl, useDefaultTTL); err != nil {
return 0, nil, err
}
return int64(len(v)), nil, nil
@@ -414,6 +419,11 @@ func (e *endpoint) SetSockOpt(opt interface{}) *tcpip.Error {
e.v6only = v != 0
+ case tcpip.TTLOption:
+ e.mu.Lock()
+ e.ttl = uint8(v)
+ e.mu.Unlock()
+
case tcpip.MulticastTTLOption:
e.mu.Lock()
e.multicastTTL = uint8(v)
@@ -628,6 +638,12 @@ func (e *endpoint) GetSockOpt(opt interface{}) *tcpip.Error {
}
return nil
+ case *tcpip.TTLOption:
+ e.mu.Lock()
+ *o = tcpip.TTLOption(e.ttl)
+ e.mu.Unlock()
+ return nil
+
case *tcpip.MulticastTTLOption:
e.mu.Lock()
*o = tcpip.MulticastTTLOption(e.multicastTTL)
@@ -694,7 +710,7 @@ func (e *endpoint) GetSockOpt(opt interface{}) *tcpip.Error {
// sendUDP sends a UDP segment via the provided network endpoint and under the
// provided identity.
-func sendUDP(r *stack.Route, data buffer.VectorisedView, localPort, remotePort uint16, ttl uint8) *tcpip.Error {
+func sendUDP(r *stack.Route, data buffer.VectorisedView, localPort, remotePort uint16, ttl uint8, useDefaultTTL bool) *tcpip.Error {
// Allocate a buffer for the UDP header.
hdr := buffer.NewPrependable(header.UDPMinimumSize + int(r.MaxHeaderLength()))
@@ -720,7 +736,7 @@ func sendUDP(r *stack.Route, data buffer.VectorisedView, localPort, remotePort u
// Track count of packets sent.
r.Stats().UDP.PacketsSent.Increment()
- return r.WritePacket(nil /* gso */, hdr, data, ProtocolNumber, ttl)
+ return r.WritePacket(nil /* gso */, hdr, data, ProtocolNumber, ttl, useDefaultTTL)
}
func (e *endpoint) checkV4Mapped(addr *tcpip.FullAddress, allowMismatch bool) (tcpip.NetworkProtocolNumber, *tcpip.Error) {
diff --git a/pkg/tcpip/transport/udp/protocol.go b/pkg/tcpip/transport/udp/protocol.go
index f5cc932dd..0b24bbc85 100644
--- a/pkg/tcpip/transport/udp/protocol.go
+++ b/pkg/tcpip/transport/udp/protocol.go
@@ -130,7 +130,7 @@ func (p *protocol) HandleUnknownDestinationPacket(r *stack.Route, id stack.Trans
pkt.SetType(header.ICMPv4DstUnreachable)
pkt.SetCode(header.ICMPv4PortUnreachable)
pkt.SetChecksum(header.ICMPv4Checksum(pkt, payload))
- r.WritePacket(nil /* gso */, hdr, payload, header.ICMPv4ProtocolNumber, r.DefaultTTL())
+ r.WritePacket(nil /* gso */, hdr, payload, header.ICMPv4ProtocolNumber, 0, true /* useDefaultTTL */)
case header.IPv6AddressSize:
if !r.Stack().AllowICMPMessage() {
@@ -164,7 +164,7 @@ func (p *protocol) HandleUnknownDestinationPacket(r *stack.Route, id stack.Trans
pkt.SetType(header.ICMPv6DstUnreachable)
pkt.SetCode(header.ICMPv6PortUnreachable)
pkt.SetChecksum(header.ICMPv6Checksum(pkt, r.LocalAddress, r.RemoteAddress, payload))
- r.WritePacket(nil /* gso */, hdr, payload, header.ICMPv6ProtocolNumber, r.DefaultTTL())
+ r.WritePacket(nil /* gso */, hdr, payload, header.ICMPv6ProtocolNumber, 0, true /* useDefaultTTL */)
}
return true
}
diff --git a/pkg/tcpip/transport/udp/udp_test.go b/pkg/tcpip/transport/udp/udp_test.go
index d1ba8d2ce..faa728b68 100644
--- a/pkg/tcpip/transport/udp/udp_test.go
+++ b/pkg/tcpip/transport/udp/udp_test.go
@@ -1207,6 +1207,39 @@ func TestTTL(t *testing.T) {
}
}
+func TestSetTTL(t *testing.T) {
+ for _, flow := range []testFlow{unicastV4, unicastV4in6, unicastV6, unicastV6Only, broadcast, broadcastIn6} {
+ t.Run(fmt.Sprintf("flow:%s", flow), func(t *testing.T) {
+ for _, wantTTL := range []uint8{1, 2, 50, 64, 128, 254, 255} {
+ t.Run(fmt.Sprintf("TTL:%d", wantTTL), func(t *testing.T) {
+ c := newDualTestContext(t, defaultMTU)
+ defer c.cleanup()
+
+ c.createEndpointForFlow(flow)
+
+ if err := c.ep.SetSockOpt(tcpip.TTLOption(wantTTL)); err != nil {
+ c.t.Fatalf("SetSockOpt failed: %v", err)
+ }
+
+ var p stack.NetworkProtocol
+ if flow.isV4() {
+ p = ipv4.NewProtocol()
+ } else {
+ p = ipv6.NewProtocol()
+ }
+ ep, err := p.NewEndpoint(0, tcpip.AddressWithPrefix{}, nil, nil, nil)
+ if err != nil {
+ t.Fatal(err)
+ }
+ ep.Close()
+
+ testWrite(c, flow, checker.TTL(wantTTL))
+ })
+ }
+ })
+ }
+}
+
func TestMulticastInterfaceOption(t *testing.T) {
for _, flow := range []testFlow{multicastV4, multicastV4in6, multicastV6, multicastV6Only} {
t.Run(fmt.Sprintf("flow:%s", flow), func(t *testing.T) {
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-12 20:09:30 +0000