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path: root/pkg/tcpip/transport/udp/endpoint.go
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Diffstat (limited to 'pkg/tcpip/transport/udp/endpoint.go')
-rw-r--r--pkg/tcpip/transport/udp/endpoint.go66
1 files changed, 54 insertions, 12 deletions
diff --git a/pkg/tcpip/transport/udp/endpoint.go b/pkg/tcpip/transport/udp/endpoint.go
index 0bec7e62d..8ae83437e 100644
--- a/pkg/tcpip/transport/udp/endpoint.go
+++ b/pkg/tcpip/transport/udp/endpoint.go
@@ -83,11 +83,13 @@ type endpoint struct {
route stack.Route `state:"manual"`
dstPort uint16
v6only bool
+ ttl uint8
multicastTTL uint8
multicastAddr tcpip.Address
multicastNICID tcpip.NICID
multicastLoop bool
reusePort bool
+ bindToDevice tcpip.NICID
broadcast bool
// shutdownFlags represent the current shutdown state of the endpoint.
@@ -144,8 +146,8 @@ func (e *endpoint) Close() {
switch e.state {
case StateBound, StateConnected:
- e.stack.UnregisterTransportEndpoint(e.regNICID, e.effectiveNetProtos, ProtocolNumber, e.id, e)
- e.stack.ReleasePort(e.effectiveNetProtos, ProtocolNumber, e.id.LocalAddress, e.id.LocalPort)
+ e.stack.UnregisterTransportEndpoint(e.regNICID, e.effectiveNetProtos, ProtocolNumber, e.id, e, e.bindToDevice)
+ e.stack.ReleasePort(e.effectiveNetProtos, ProtocolNumber, e.id.LocalAddress, e.id.LocalPort, e.bindToDevice)
}
for _, mem := range e.multicastMemberships {
@@ -373,12 +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
@@ -413,6 +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)
@@ -551,6 +562,21 @@ func (e *endpoint) SetSockOpt(opt interface{}) *tcpip.Error {
e.reusePort = v != 0
e.mu.Unlock()
+ case tcpip.BindToDeviceOption:
+ e.mu.Lock()
+ defer e.mu.Unlock()
+ if v == "" {
+ e.bindToDevice = 0
+ return nil
+ }
+ for nicid, nic := range e.stack.NICInfo() {
+ if nic.Name == string(v) {
+ e.bindToDevice = nicid
+ return nil
+ }
+ }
+ return tcpip.ErrUnknownDevice
+
case tcpip.BroadcastOption:
e.mu.Lock()
e.broadcast = v != 0
@@ -612,6 +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)
@@ -646,6 +678,16 @@ func (e *endpoint) GetSockOpt(opt interface{}) *tcpip.Error {
}
return nil
+ case *tcpip.BindToDeviceOption:
+ e.mu.RLock()
+ defer e.mu.RUnlock()
+ if nic, ok := e.stack.NICInfo()[e.bindToDevice]; ok {
+ *o = tcpip.BindToDeviceOption(nic.Name)
+ return nil
+ }
+ *o = tcpip.BindToDeviceOption("")
+ return nil
+
case *tcpip.KeepaliveEnabledOption:
*o = 0
return nil
@@ -668,7 +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()))
@@ -694,7 +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) {
@@ -753,12 +795,12 @@ func (e *endpoint) Disconnect() *tcpip.Error {
} else {
if e.id.LocalPort != 0 {
// Release the ephemeral port.
- e.stack.ReleasePort(e.effectiveNetProtos, ProtocolNumber, e.id.LocalAddress, e.id.LocalPort)
+ e.stack.ReleasePort(e.effectiveNetProtos, ProtocolNumber, e.id.LocalAddress, e.id.LocalPort, e.bindToDevice)
}
e.state = StateInitial
}
- e.stack.UnregisterTransportEndpoint(e.regNICID, e.effectiveNetProtos, ProtocolNumber, e.id, e)
+ e.stack.UnregisterTransportEndpoint(e.regNICID, e.effectiveNetProtos, ProtocolNumber, e.id, e, e.bindToDevice)
e.id = id
e.route.Release()
e.route = stack.Route{}
@@ -835,7 +877,7 @@ func (e *endpoint) Connect(addr tcpip.FullAddress) *tcpip.Error {
// Remove the old registration.
if e.id.LocalPort != 0 {
- e.stack.UnregisterTransportEndpoint(e.regNICID, e.effectiveNetProtos, ProtocolNumber, e.id, e)
+ e.stack.UnregisterTransportEndpoint(e.regNICID, e.effectiveNetProtos, ProtocolNumber, e.id, e, e.bindToDevice)
}
e.id = id
@@ -898,16 +940,16 @@ func (*endpoint) Accept() (tcpip.Endpoint, *waiter.Queue, *tcpip.Error) {
func (e *endpoint) registerWithStack(nicid tcpip.NICID, netProtos []tcpip.NetworkProtocolNumber, id stack.TransportEndpointID) (stack.TransportEndpointID, *tcpip.Error) {
if e.id.LocalPort == 0 {
- port, err := e.stack.ReservePort(netProtos, ProtocolNumber, id.LocalAddress, id.LocalPort, e.reusePort)
+ port, err := e.stack.ReservePort(netProtos, ProtocolNumber, id.LocalAddress, id.LocalPort, e.reusePort, e.bindToDevice)
if err != nil {
return id, err
}
id.LocalPort = port
}
- err := e.stack.RegisterTransportEndpoint(nicid, netProtos, ProtocolNumber, id, e, e.reusePort)
+ err := e.stack.RegisterTransportEndpoint(nicid, netProtos, ProtocolNumber, id, e, e.reusePort, e.bindToDevice)
if err != nil {
- e.stack.ReleasePort(netProtos, ProtocolNumber, id.LocalAddress, id.LocalPort)
+ e.stack.ReleasePort(netProtos, ProtocolNumber, id.LocalAddress, id.LocalPort, e.bindToDevice)
}
return id, err
}
generated by cgit v1.2.3 (git 2.39.1) at 2025-04-06 08:55:51 +0000