From 0cc1e74b57e539e66c1a421c047a08635c0008e8 Mon Sep 17 00:00:00 2001 From: Bert Muthalaly Date: Wed, 8 Jan 2020 09:28:53 -0800 Subject: Add NIC.isLoopback() ...enabling us to remove the "CreateNamedLoopbackNIC" variant of CreateNIC and all the plumbing to connect it through to where the value is read in FindRoute. PiperOrigin-RevId: 288713093 --- pkg/tcpip/stack/nic.go | 18 ++++++++++-------- pkg/tcpip/stack/stack.go | 24 +++++++++--------------- pkg/tcpip/stack/stack_test.go | 7 ++++--- runsc/boot/network.go | 16 +++++----------- 4 files changed, 28 insertions(+), 37 deletions(-) diff --git a/pkg/tcpip/stack/nic.go b/pkg/tcpip/stack/nic.go index 5726c3642..4144d5d0f 100644 --- a/pkg/tcpip/stack/nic.go +++ b/pkg/tcpip/stack/nic.go @@ -27,11 +27,10 @@ import ( // NIC represents a "network interface card" to which the networking stack is // attached. type NIC struct { - stack *Stack - id tcpip.NICID - name string - linkEP LinkEndpoint - loopback bool + stack *Stack + id tcpip.NICID + name string + linkEP LinkEndpoint mu sync.RWMutex spoofing bool @@ -85,7 +84,7 @@ const ( ) // newNIC returns a new NIC using the default NDP configurations from stack. -func newNIC(stack *Stack, id tcpip.NICID, name string, ep LinkEndpoint, loopback bool) *NIC { +func newNIC(stack *Stack, id tcpip.NICID, name string, ep LinkEndpoint) *NIC { // TODO(b/141011931): Validate a LinkEndpoint (ep) is valid. For // example, make sure that the link address it provides is a valid // unicast ethernet address. @@ -99,7 +98,6 @@ func newNIC(stack *Stack, id tcpip.NICID, name string, ep LinkEndpoint, loopback id: id, name: name, linkEP: ep, - loopback: loopback, primary: make(map[tcpip.NetworkProtocolNumber][]*referencedNetworkEndpoint), endpoints: make(map[NetworkEndpointID]*referencedNetworkEndpoint), mcastJoins: make(map[NetworkEndpointID]int32), @@ -175,7 +173,7 @@ func (n *NIC) enable() *tcpip.Error { } // Do not auto-generate an IPv6 link-local address for loopback devices. - if !n.stack.autoGenIPv6LinkLocal || n.loopback { + if !n.stack.autoGenIPv6LinkLocal || n.isLoopback() { return nil } @@ -240,6 +238,10 @@ func (n *NIC) isPromiscuousMode() bool { return rv } +func (n *NIC) isLoopback() bool { + return n.linkEP.Capabilities()&CapabilityLoopback != 0 +} + // setSpoofing enables or disables address spoofing. func (n *NIC) setSpoofing(enable bool) { n.mu.Lock() diff --git a/pkg/tcpip/stack/stack.go b/pkg/tcpip/stack/stack.go index 583ede3e5..807f910f6 100644 --- a/pkg/tcpip/stack/stack.go +++ b/pkg/tcpip/stack/stack.go @@ -798,7 +798,7 @@ func (s *Stack) NewPacketEndpoint(cooked bool, netProto tcpip.NetworkProtocolNum // createNIC creates a NIC with the provided id and link-layer endpoint, and // optionally enable it. -func (s *Stack) createNIC(id tcpip.NICID, name string, ep LinkEndpoint, enabled, loopback bool) *tcpip.Error { +func (s *Stack) createNIC(id tcpip.NICID, name string, ep LinkEndpoint, enabled bool) *tcpip.Error { s.mu.Lock() defer s.mu.Unlock() @@ -807,7 +807,7 @@ func (s *Stack) createNIC(id tcpip.NICID, name string, ep LinkEndpoint, enabled, return tcpip.ErrDuplicateNICID } - n := newNIC(s, id, name, ep, loopback) + n := newNIC(s, id, name, ep) s.nics[id] = n if enabled { @@ -819,32 +819,26 @@ func (s *Stack) createNIC(id tcpip.NICID, name string, ep LinkEndpoint, enabled, // CreateNIC creates a NIC with the provided id and link-layer endpoint. func (s *Stack) CreateNIC(id tcpip.NICID, ep LinkEndpoint) *tcpip.Error { - return s.createNIC(id, "", ep, true, false) + return s.createNIC(id, "", ep, true) } // CreateNamedNIC creates a NIC with the provided id and link-layer endpoint, // and a human-readable name. func (s *Stack) CreateNamedNIC(id tcpip.NICID, name string, ep LinkEndpoint) *tcpip.Error { - return s.createNIC(id, name, ep, true, false) -} - -// CreateNamedLoopbackNIC creates a NIC with the provided id and link-layer -// endpoint, and a human-readable name. -func (s *Stack) CreateNamedLoopbackNIC(id tcpip.NICID, name string, ep LinkEndpoint) *tcpip.Error { - return s.createNIC(id, name, ep, true, true) + return s.createNIC(id, name, ep, true) } // CreateDisabledNIC creates a NIC with the provided id and link-layer endpoint, // but leave it disable. Stack.EnableNIC must be called before the link-layer // endpoint starts delivering packets to it. func (s *Stack) CreateDisabledNIC(id tcpip.NICID, ep LinkEndpoint) *tcpip.Error { - return s.createNIC(id, "", ep, false, false) + return s.createNIC(id, "", ep, false) } // CreateDisabledNamedNIC is a combination of CreateNamedNIC and // CreateDisabledNIC. func (s *Stack) CreateDisabledNamedNIC(id tcpip.NICID, name string, ep LinkEndpoint) *tcpip.Error { - return s.createNIC(id, name, ep, false, false) + return s.createNIC(id, name, ep, false) } // EnableNIC enables the given NIC so that the link-layer endpoint can start @@ -911,7 +905,7 @@ func (s *Stack) NICInfo() map[tcpip.NICID]NICInfo { Up: true, // Netstack interfaces are always up. Running: nic.linkEP.IsAttached(), Promiscuous: nic.isPromiscuousMode(), - Loopback: nic.linkEP.Capabilities()&CapabilityLoopback != 0, + Loopback: nic.isLoopback(), } nics[id] = NICInfo{ Name: nic.name, @@ -1072,7 +1066,7 @@ func (s *Stack) FindRoute(id tcpip.NICID, localAddr, remoteAddr tcpip.Address, n if id != 0 && !needRoute { if nic, ok := s.nics[id]; ok { if ref := s.getRefEP(nic, localAddr, netProto); ref != nil { - return makeRoute(netProto, ref.ep.ID().LocalAddress, remoteAddr, nic.linkEP.LinkAddress(), ref, s.handleLocal && !nic.loopback, multicastLoop && !nic.loopback), nil + return makeRoute(netProto, ref.ep.ID().LocalAddress, remoteAddr, nic.linkEP.LinkAddress(), ref, s.handleLocal && !nic.isLoopback(), multicastLoop && !nic.isLoopback()), nil } } } else { @@ -1088,7 +1082,7 @@ func (s *Stack) FindRoute(id tcpip.NICID, localAddr, remoteAddr tcpip.Address, n remoteAddr = ref.ep.ID().LocalAddress } - r := makeRoute(netProto, ref.ep.ID().LocalAddress, remoteAddr, nic.linkEP.LinkAddress(), ref, s.handleLocal && !nic.loopback, multicastLoop && !nic.loopback) + r := makeRoute(netProto, ref.ep.ID().LocalAddress, remoteAddr, nic.linkEP.LinkAddress(), ref, s.handleLocal && !nic.isLoopback(), multicastLoop && !nic.isLoopback()) if needRoute { r.NextHop = route.Gateway } diff --git a/pkg/tcpip/stack/stack_test.go b/pkg/tcpip/stack/stack_test.go index d970a4abb..bf057745e 100644 --- a/pkg/tcpip/stack/stack_test.go +++ b/pkg/tcpip/stack/stack_test.go @@ -32,6 +32,7 @@ import ( "gvisor.dev/gvisor/pkg/tcpip/buffer" "gvisor.dev/gvisor/pkg/tcpip/header" "gvisor.dev/gvisor/pkg/tcpip/link/channel" + "gvisor.dev/gvisor/pkg/tcpip/link/loopback" "gvisor.dev/gvisor/pkg/tcpip/network/ipv6" "gvisor.dev/gvisor/pkg/tcpip/stack" ) @@ -2153,10 +2154,10 @@ func TestNoLinkLocalAutoGenForLoopbackNIC(t *testing.T) { OpaqueIIDOpts: test.opaqueIIDOpts, } - e := channel.New(0, 1280, linkAddr1) + e := loopback.New() s := stack.New(opts) - if err := s.CreateNamedLoopbackNIC(nicID, nicName, e); err != nil { - t.Fatalf("CreateNamedLoopbackNIC(%d, %q, _) = %s", nicID, nicName, err) + if err := s.CreateNamedNIC(nicID, nicName, e); err != nil { + t.Fatalf("CreateNamedNIC(%d, %q, _) = %s", nicID, nicName, err) } addr, err := s.GetMainNICAddress(nicID, header.IPv6ProtocolNumber) diff --git a/runsc/boot/network.go b/runsc/boot/network.go index dd4926bb9..0240fe323 100644 --- a/runsc/boot/network.go +++ b/runsc/boot/network.go @@ -126,7 +126,7 @@ func (n *Network) CreateLinksAndRoutes(args *CreateLinksAndRoutesArgs, _ *struct linkEP := loopback.New() log.Infof("Enabling loopback interface %q with id %d on addresses %+v", link.Name, nicID, link.Addresses) - if err := n.createNICWithAddrs(nicID, link.Name, linkEP, link.Addresses, true /* loopback */); err != nil { + if err := n.createNICWithAddrs(nicID, link.Name, linkEP, link.Addresses); err != nil { return err } @@ -173,7 +173,7 @@ func (n *Network) CreateLinksAndRoutes(args *CreateLinksAndRoutesArgs, _ *struct } log.Infof("Enabling interface %q with id %d on addresses %+v (%v) w/ %d channels", link.Name, nicID, link.Addresses, mac, link.NumChannels) - if err := n.createNICWithAddrs(nicID, link.Name, linkEP, link.Addresses, false /* loopback */); err != nil { + if err := n.createNICWithAddrs(nicID, link.Name, linkEP, link.Addresses); err != nil { return err } @@ -218,15 +218,9 @@ func (n *Network) CreateLinksAndRoutes(args *CreateLinksAndRoutesArgs, _ *struct // createNICWithAddrs creates a NIC in the network stack and adds the given // addresses. -func (n *Network) createNICWithAddrs(id tcpip.NICID, name string, ep stack.LinkEndpoint, addrs []net.IP, loopback bool) error { - if loopback { - if err := n.Stack.CreateNamedLoopbackNIC(id, name, sniffer.New(ep)); err != nil { - return fmt.Errorf("CreateNamedLoopbackNIC(%v, %v, %v) failed: %v", id, name, ep, err) - } - } else { - if err := n.Stack.CreateNamedNIC(id, name, sniffer.New(ep)); err != nil { - return fmt.Errorf("CreateNamedNIC(%v, %v, %v) failed: %v", id, name, ep, err) - } +func (n *Network) createNICWithAddrs(id tcpip.NICID, name string, ep stack.LinkEndpoint, addrs []net.IP) error { + if err := n.Stack.CreateNamedNIC(id, name, sniffer.New(ep)); err != nil { + return fmt.Errorf("CreateNamedNIC(%v, %v, %v) failed: %v", id, name, ep, err) } // Always start with an arp address for the NIC. -- cgit v1.2.3