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-rw-r--r--pkg/tcpip/stack/route.go18
-rw-r--r--pkg/tcpip/stack/stack.go50
-rw-r--r--pkg/tcpip/transport/udp/endpoint.go8
-rw-r--r--pkg/tcpip/transport/udp/endpoint_state.go2
4 files changed, 62 insertions, 16 deletions
diff --git a/pkg/tcpip/stack/route.go b/pkg/tcpip/stack/route.go
index 53cb6694f..13b42d34b 100644
--- a/pkg/tcpip/stack/route.go
+++ b/pkg/tcpip/stack/route.go
@@ -71,22 +71,24 @@ type Route struct {
// ownership of the provided local address.
//
// Returns an empty route if validation fails.
-func constructAndValidateRoute(netProto tcpip.NetworkProtocolNumber, addressEndpoint AssignableAddressEndpoint, localAddressNIC, outgoingNIC *NIC, gateway, remoteAddr tcpip.Address, handleLocal, multicastLoop bool) Route {
- addrWithPrefix := addressEndpoint.AddressWithPrefix()
+func constructAndValidateRoute(netProto tcpip.NetworkProtocolNumber, addressEndpoint AssignableAddressEndpoint, localAddressNIC, outgoingNIC *NIC, gateway, localAddr, remoteAddr tcpip.Address, handleLocal, multicastLoop bool) Route {
+ if len(localAddr) == 0 {
+ localAddr = addressEndpoint.AddressWithPrefix().Address
+ }
- if localAddressNIC != outgoingNIC && header.IsV6LinkLocalAddress(addrWithPrefix.Address) {
+ if localAddressNIC != outgoingNIC && header.IsV6LinkLocalAddress(localAddr) {
addressEndpoint.DecRef()
return Route{}
}
// If no remote address is provided, use the local address.
if len(remoteAddr) == 0 {
- remoteAddr = addrWithPrefix.Address
+ remoteAddr = localAddr
}
r := makeRoute(
netProto,
- addrWithPrefix.Address,
+ localAddr,
remoteAddr,
outgoingNIC,
localAddressNIC,
@@ -99,7 +101,7 @@ func constructAndValidateRoute(netProto tcpip.NetworkProtocolNumber, addressEndp
// broadcast it.
if len(gateway) > 0 {
r.NextHop = gateway
- } else if subnet := addrWithPrefix.Subnet(); subnet.IsBroadcast(remoteAddr) {
+ } else if subnet := addressEndpoint.Subnet(); subnet.IsBroadcast(remoteAddr) {
r.RemoteLinkAddress = header.EthernetBroadcastAddress
}
@@ -113,6 +115,10 @@ func makeRoute(netProto tcpip.NetworkProtocolNumber, localAddr, remoteAddr tcpip
panic(fmt.Sprintf("cannot create a route with NICs from different stacks"))
}
+ if len(localAddr) == 0 {
+ localAddr = localAddressEndpoint.AddressWithPrefix().Address
+ }
+
loop := PacketOut
// TODO(gvisor.dev/issue/4689): Loopback interface loops back packets at the
diff --git a/pkg/tcpip/stack/stack.go b/pkg/tcpip/stack/stack.go
index f4504e633..e788344d9 100644
--- a/pkg/tcpip/stack/stack.go
+++ b/pkg/tcpip/stack/stack.go
@@ -1240,7 +1240,7 @@ func (s *Stack) findLocalRouteFromNICRLocked(localAddressNIC *NIC, localAddr, re
r := makeLocalRoute(
netProto,
- localAddressEndpoint.AddressWithPrefix().Address,
+ localAddr,
remoteAddr,
outgoingNIC,
localAddressNIC,
@@ -1317,7 +1317,7 @@ func (s *Stack) FindRoute(id tcpip.NICID, localAddr, remoteAddr tcpip.Address, n
if addressEndpoint := s.getAddressEP(nic, localAddr, remoteAddr, netProto); addressEndpoint != nil {
return makeRoute(
netProto,
- addressEndpoint.AddressWithPrefix().Address,
+ localAddr,
remoteAddr,
nic, /* outboundNIC */
nic, /* localAddressNIC*/
@@ -1354,7 +1354,7 @@ func (s *Stack) FindRoute(id tcpip.NICID, localAddr, remoteAddr tcpip.Address, n
if needRoute {
gateway = route.Gateway
}
- r := constructAndValidateRoute(netProto, addressEndpoint, nic /* outgoingNIC */, nic /* outgoingNIC */, gateway, remoteAddr, s.handleLocal, multicastLoop)
+ r := constructAndValidateRoute(netProto, addressEndpoint, nic /* outgoingNIC */, nic /* outgoingNIC */, gateway, localAddr, remoteAddr, s.handleLocal, multicastLoop)
if r == (Route{}) {
panic(fmt.Sprintf("non-forwarding route validation failed with route table entry = %#v, id = %d, localAddr = %s, remoteAddr = %s", route, id, localAddr, remoteAddr))
}
@@ -1391,7 +1391,7 @@ func (s *Stack) FindRoute(id tcpip.NICID, localAddr, remoteAddr tcpip.Address, n
if id != 0 {
if aNIC, ok := s.nics[id]; ok {
if addressEndpoint := s.getAddressEP(aNIC, localAddr, remoteAddr, netProto); addressEndpoint != nil {
- if r := constructAndValidateRoute(netProto, addressEndpoint, aNIC /* localAddressNIC */, nic /* outgoingNIC */, gateway, remoteAddr, s.handleLocal, multicastLoop); r != (Route{}) {
+ if r := constructAndValidateRoute(netProto, addressEndpoint, aNIC /* localAddressNIC */, nic /* outgoingNIC */, gateway, localAddr, remoteAddr, s.handleLocal, multicastLoop); r != (Route{}) {
return r, nil
}
}
@@ -1409,7 +1409,7 @@ func (s *Stack) FindRoute(id tcpip.NICID, localAddr, remoteAddr tcpip.Address, n
continue
}
- if r := constructAndValidateRoute(netProto, addressEndpoint, aNIC /* localAddressNIC */, nic /* outgoingNIC */, gateway, remoteAddr, s.handleLocal, multicastLoop); r != (Route{}) {
+ if r := constructAndValidateRoute(netProto, addressEndpoint, aNIC /* localAddressNIC */, nic /* outgoingNIC */, gateway, localAddr, remoteAddr, s.handleLocal, multicastLoop); r != (Route{}) {
return r, nil
}
}
@@ -2130,3 +2130,43 @@ func (s *Stack) networkProtocolNumbers() []tcpip.NetworkProtocolNumber {
}
return protos
}
+
+func isSubnetBroadcastOnNIC(nic *NIC, protocol tcpip.NetworkProtocolNumber, addr tcpip.Address) bool {
+ addressEndpoint := nic.getAddressOrCreateTempInner(protocol, addr, false /* createTemp */, NeverPrimaryEndpoint)
+ if addressEndpoint == nil {
+ return false
+ }
+
+ subnet := addressEndpoint.Subnet()
+ addressEndpoint.DecRef()
+ return subnet.IsBroadcast(addr)
+}
+
+// IsSubnetBroadcast returns true if the provided address is a subnet-local
+// broadcast address on the specified NIC and protocol.
+//
+// Returns false if the NIC is unknown or if the protocol is unknown or does
+// not support addressing.
+//
+// If the NIC is not specified, the stack will check all NICs.
+func (s *Stack) IsSubnetBroadcast(nicID tcpip.NICID, protocol tcpip.NetworkProtocolNumber, addr tcpip.Address) bool {
+ s.mu.RLock()
+ defer s.mu.RUnlock()
+
+ if nicID != 0 {
+ nic, ok := s.nics[nicID]
+ if !ok {
+ return false
+ }
+
+ return isSubnetBroadcastOnNIC(nic, protocol, addr)
+ }
+
+ for _, nic := range s.nics {
+ if isSubnetBroadcastOnNIC(nic, protocol, addr) {
+ return true
+ }
+ }
+
+ return false
+}
diff --git a/pkg/tcpip/transport/udp/endpoint.go b/pkg/tcpip/transport/udp/endpoint.go
index 81601f559..648587137 100644
--- a/pkg/tcpip/transport/udp/endpoint.go
+++ b/pkg/tcpip/transport/udp/endpoint.go
@@ -369,7 +369,7 @@ func (e *endpoint) prepareForWrite(to *tcpip.FullAddress) (retry bool, err *tcpi
// specified address is a multicast address.
func (e *endpoint) connectRoute(nicID tcpip.NICID, addr tcpip.FullAddress, netProto tcpip.NetworkProtocolNumber) (stack.Route, tcpip.NICID, *tcpip.Error) {
localAddr := e.ID.LocalAddress
- if isBroadcastOrMulticast(localAddr) {
+ if e.isBroadcastOrMulticast(nicID, netProto, localAddr) {
// A packet can only originate from a unicast address (i.e., an interface).
localAddr = ""
}
@@ -1290,7 +1290,7 @@ func (e *endpoint) bindLocked(addr tcpip.FullAddress) *tcpip.Error {
}
nicID := addr.NIC
- if len(addr.Addr) != 0 && !isBroadcastOrMulticast(addr.Addr) {
+ if len(addr.Addr) != 0 && !e.isBroadcastOrMulticast(addr.NIC, netProto, addr.Addr) {
// A local unicast address was specified, verify that it's valid.
nicID = e.stack.CheckLocalAddress(addr.NIC, netProto, addr.Addr)
if nicID == 0 {
@@ -1531,8 +1531,8 @@ func (e *endpoint) Stats() tcpip.EndpointStats {
// Wait implements tcpip.Endpoint.Wait.
func (*endpoint) Wait() {}
-func isBroadcastOrMulticast(a tcpip.Address) bool {
- return a == header.IPv4Broadcast || header.IsV4MulticastAddress(a) || header.IsV6MulticastAddress(a)
+func (e *endpoint) isBroadcastOrMulticast(nicID tcpip.NICID, netProto tcpip.NetworkProtocolNumber, addr tcpip.Address) bool {
+ return addr == header.IPv4Broadcast || header.IsV4MulticastAddress(addr) || header.IsV6MulticastAddress(addr) || e.stack.IsSubnetBroadcast(nicID, netProto, addr)
}
// SetOwner implements tcpip.Endpoint.SetOwner.
diff --git a/pkg/tcpip/transport/udp/endpoint_state.go b/pkg/tcpip/transport/udp/endpoint_state.go
index 858c99a45..99f3fc37f 100644
--- a/pkg/tcpip/transport/udp/endpoint_state.go
+++ b/pkg/tcpip/transport/udp/endpoint_state.go
@@ -118,7 +118,7 @@ func (e *endpoint) Resume(s *stack.Stack) {
if err != nil {
panic(err)
}
- } else if len(e.ID.LocalAddress) != 0 && !isBroadcastOrMulticast(e.ID.LocalAddress) { // stateBound
+ } else if len(e.ID.LocalAddress) != 0 && !e.isBroadcastOrMulticast(e.RegisterNICID, netProto, e.ID.LocalAddress) { // stateBound
// A local unicast address is specified, verify that it's valid.
if e.stack.CheckLocalAddress(e.RegisterNICID, netProto, e.ID.LocalAddress) == 0 {
panic(tcpip.ErrBadLocalAddress)
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-09 01:33:22 +0000