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Copy route MTU from net namespace and adjust for network header size #12373

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5 changes: 5 additions & 0 deletions pkg/tcpip/network/arp/arp.go
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Original file line numberDiff line numberDiff line change
Expand Up@@ -128,6 +128,11 @@ func (e *endpoint) MTU() uint32{
return lmtu - uint32(e.MaxHeaderLength())
}

// EndpointHeaderSize returns the size necessary for the ARP header.
func (e *endpoint) EndpointHeaderSize() uint32{
return header.ARPSize
}

func (e *endpoint) MaxHeaderLength() uint16{
return e.nic.MaxHeaderLength() + header.ARPSize
}
Expand Down
5 changes: 5 additions & 0 deletions pkg/tcpip/network/ipv4/ipv4.go
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Expand Up@@ -426,6 +426,11 @@ func (e *endpoint) MTU() uint32{
return networkMTU
}

// EndpointHeaderSize returns the size necessary for the IPv4 header.
func (e *endpoint) EndpointHeaderSize() uint32{
return header.IPv4MinimumSize
}

// MaxHeaderLength returns the maximum length needed by ipv4 headers (and
// underlying protocols).
func (e *endpoint) MaxHeaderLength() uint16{
Expand Down
5 changes: 5 additions & 0 deletions pkg/tcpip/network/ipv6/ipv6.go
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Expand Up@@ -728,6 +728,11 @@ func (e *endpoint) MTU() uint32{
return networkMTU
}

// EndpointHeaderSize returns the size necessary for the IPv6 header.
func (e *endpoint) EndpointHeaderSize() uint32{
return header.IPv6MinimumSize
}

// MaxHeaderLength returns the maximum length needed by ipv6 headers (and
// underlying protocols).
func (e *endpoint) MaxHeaderLength() uint16{
Expand Down
5 changes: 5 additions & 0 deletions pkg/tcpip/stack/forwarding_test.go
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Expand Up@@ -109,6 +109,11 @@ func (f *fwdTestNetworkEndpoint) HandlePacket(pkt *PacketBuffer){
_ = r.WriteHeaderIncludedPacket(pkt)
}

// EndpointHeaderSize implements NetworkEndpoint.EndpointHeaderSize.
func (f *fwdTestNetworkEndpoint) EndpointHeaderSize() uint32{
return fwdTestNetHeaderLen
}

func (f *fwdTestNetworkEndpoint) MaxHeaderLength() uint16{
return f.nic.MaxHeaderLength() + fwdTestNetHeaderLen
}
Expand Down
5 changes: 5 additions & 0 deletions pkg/tcpip/stack/nic_test.go
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Expand Up@@ -62,6 +62,11 @@ func (e *testIPv6Endpoint) MTU() uint32{
return e.nic.MTU() - header.IPv6MinimumSize
}

// EndpointHeaderSize implements NetworkEndpoint.EndpointHeaderSize.
func (e *testIPv6Endpoint) EndpointHeaderSize() uint32{
return header.IPv6MinimumSize
}

// MaxHeaderLength implements NetworkEndpoint.MaxHeaderLength.
func (e *testIPv6Endpoint) MaxHeaderLength() uint16{
return e.nic.MaxHeaderLength() + header.IPv6MinimumSize
Expand Down
3 changes: 3 additions & 0 deletions pkg/tcpip/stack/registration.go
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Expand Up@@ -872,6 +872,9 @@ type NetworkEndpoint interface{
// minus the network endpoint max header length.
MTU() uint32

// EndpointHeaderSize returns the size of this endpoint header.
EndpointHeaderSize() uint32

// MaxHeaderLength returns the maximum size the network (and lower
// level layers combined) headers can have. Higher levels use this
// information to reserve space in the front of the packets they're
Expand Down
9 changes: 9 additions & 0 deletions pkg/tcpip/stack/route.go
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Expand Up@@ -245,6 +245,14 @@ func makeRoute(netProto tcpip.NetworkProtocolNumber, gateway, localAddr, remoteA
}

func makeRouteInner(netProto tcpip.NetworkProtocolNumber, localAddr, remoteAddr tcpip.Address, outgoingNIC, localAddressNIC *nic, localAddressEndpoint AssignableAddressEndpoint, loop PacketLooping, mtu uint32) *Route{
if mtu != 0{
adjusted := mtu - outgoingNIC.getNetworkEndpoint(netProto).EndpointHeaderSize()
if adjusted > mtu{
mtu = 0
} else{
mtu = adjusted
}
}
r := &Route{
routeInfo: routeInfo{
NetProto: netProto,
Expand DownExpand Up@@ -520,6 +528,7 @@ func (r *Route) DefaultTTL() uint8{
// MTU returns the MTU of the route if present, otherwise the MTU of the underlying network endpoint.
func (r *Route) MTU() uint32{
if r.mtu > 0{
// r.mtu is already adjusted to account for IP headers. See makeRouteInner.
return r.mtu
}
return r.outgoingNIC.getNetworkEndpoint(r.NetProto()).MTU()
Expand Down
77 changes: 46 additions & 31 deletions pkg/tcpip/stack/stack_test.go
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Expand Up@@ -169,6 +169,10 @@ func (f *fakeNetworkEndpoint) HandlePacket(pkt *stack.PacketBuffer){
f.dispatcher.DeliverTransportPacket(transProtoNum, pkt)
}

func (f *fakeNetworkEndpoint) EndpointHeaderSize() uint32{
return fakeNetHeaderLen
}

func (f *fakeNetworkEndpoint) MaxHeaderLength() uint16{
return f.nic.MaxHeaderLength() + fakeNetHeaderLen
}
Expand DownExpand Up@@ -832,6 +836,8 @@ func TestNetworkSendMultiRoute(t *testing.T){
}

func testRoute(t *testing.T, s *stack.Stack, nic tcpip.NICID, srcAddr, dstAddr, expectedSrcAddr tcpip.Address, expectedRouteMTU int){
t.Helper()

r, err := s.FindRoute(nic, srcAddr, dstAddr, fakeNetNumber, false /* multicastLoop */)
if err != nil{
t.Fatal("FindRoute failed:", err)
Expand All@@ -840,19 +846,21 @@ func testRoute(t *testing.T, s *stack.Stack, nic tcpip.NICID, srcAddr, dstAddr,
defer r.Release()

if r.LocalAddress() != expectedSrcAddr{
t.Fatalf("got Route.LocalAddress() = %s, want = %s", expectedSrcAddr, r.LocalAddress())
t.Errorf("got Route.LocalAddress() = %s, want = %s", expectedSrcAddr, r.LocalAddress())
}

if r.RemoteAddress() != dstAddr{
t.Fatalf("got Route.RemoteAddress() = %s, want = %s", dstAddr, r.RemoteAddress())
t.Errorf("got Route.RemoteAddress() = %s, want = %s", dstAddr, r.RemoteAddress())
}

if int(r.MTU()) != expectedRouteMTU{
t.Fatalf("got Route.MTU() = %d, want = %d", r.MTU(), expectedRouteMTU)
t.Errorf("got Route.MTU() = %d, want = %d", r.MTU(), expectedRouteMTU)
}
}

func testNoRoute(t *testing.T, s *stack.Stack, nic tcpip.NICID, srcAddr, dstAddr tcpip.Address){
t.Helper()

_, err := s.FindRoute(nic, srcAddr, dstAddr, fakeNetNumber, false /* multicastLoop */)
if _, ok := err.(*tcpip.ErrNetworkUnreachable); !ok{
t.Fatalf("FindRoute returned unexpected error, got = %v, want = %s", err, &tcpip.ErrNetworkUnreachable{})
Expand DownExpand Up@@ -1043,17 +1051,22 @@ func TestRouteWithDownNIC(t *testing.T){
const unspecifiedNIC = 0
const nicID1 = 1
const nicID2 = 2
var addr1 = tcpip.AddrFrom4Slice([]byte("\x01\x00\x00\x00"))
var addr2 = tcpip.AddrFrom4Slice([]byte("\x02\x00\x00\x00"))
var nic1Dst = tcpip.AddrFrom4Slice([]byte("\x05\x00\x00\x00"))
var nic2Dst = tcpip.AddrFrom4Slice([]byte("\x06\x00\x00\x00"))
var nic1RouteMTU = 1500
var nic2RouteMTU = 1460
addr1 := tcpip.AddrFrom4Slice([]byte("\x01\x00\x00\x00"))
addr2 := tcpip.AddrFrom4Slice([]byte("\x02\x00\x00\x00"))
nic1Dst := tcpip.AddrFrom4Slice([]byte("\x05\x00\x00\x00"))
nic2Dst := tcpip.AddrFrom4Slice([]byte("\x06\x00\x00\x00"))
nic1RouteMTU := 1500
nic2RouteMTU := 1460
// These are set in setup function, because they depend on protocl being used.
nic1RouteMTUAtNetworkLayer := 0
nic2RouteMTUAtNetworkLayer := 0

setup := func(t *testing.T) (*stack.Stack, *channel.Endpoint, *channel.Endpoint){
s := stack.New(stack.Options{
NetworkProtocols: []stack.NetworkProtocolFactory{fakeNetFactory},
})
nic1RouteMTUAtNetworkLayer = nic1RouteMTU - fakeNetHeaderLen
nic2RouteMTUAtNetworkLayer = nic2RouteMTU - fakeNetHeaderLen

ep1 := channel.New(1, defaultMTU, "")
if err := s.CreateNIC(nicID1, ep1); err != nil{
Expand DownExpand Up@@ -1116,14 +1129,14 @@ func TestRouteWithDownNIC(t *testing.T){
s, _, _ := setup(t)

// Test routes to odd address.
testRoute(t, s, unspecifiedNIC, tcpip.Address{}, tcpip.AddrFromSlice([]byte("\x05\x00\x00\x00")), addr1, nic1RouteMTU)
testRoute(t, s, unspecifiedNIC, addr1, tcpip.AddrFromSlice([]byte("\x05\x00\x00\x00")), addr1, nic1RouteMTU)
testRoute(t, s, nicID1, addr1, tcpip.AddrFromSlice([]byte("\x05\x00\x00\x00")), addr1, nic1RouteMTU)
testRoute(t, s, unspecifiedNIC, tcpip.Address{}, tcpip.AddrFromSlice([]byte("\x05\x00\x00\x00")), addr1, nic1RouteMTUAtNetworkLayer)
testRoute(t, s, unspecifiedNIC, addr1, tcpip.AddrFromSlice([]byte("\x05\x00\x00\x00")), addr1, nic1RouteMTUAtNetworkLayer)
testRoute(t, s, nicID1, addr1, tcpip.AddrFromSlice([]byte("\x05\x00\x00\x00")), addr1, nic1RouteMTUAtNetworkLayer)

// Test routes to even address.
testRoute(t, s, unspecifiedNIC, tcpip.Address{}, tcpip.AddrFromSlice([]byte("\x06\x00\x00\x00")), addr2, nic2RouteMTU)
testRoute(t, s, unspecifiedNIC, addr2, tcpip.AddrFromSlice([]byte("\x06\x00\x00\x00")), addr2, nic2RouteMTU)
testRoute(t, s, nicID2, addr2, tcpip.AddrFromSlice([]byte("\x06\x00\x00\x00")), addr2, nic2RouteMTU)
testRoute(t, s, unspecifiedNIC, tcpip.Address{}, tcpip.AddrFromSlice([]byte("\x06\x00\x00\x00")), addr2, nic2RouteMTUAtNetworkLayer)
testRoute(t, s, unspecifiedNIC, addr2, tcpip.AddrFromSlice([]byte("\x06\x00\x00\x00")), addr2, nic2RouteMTUAtNetworkLayer)
testRoute(t, s, nicID2, addr2, tcpip.AddrFromSlice([]byte("\x06\x00\x00\x00")), addr2, nic2RouteMTUAtNetworkLayer)

// Bringing NIC1 down should result in no routes to odd addresses. Routes to
// even addresses should continue to be available as NIC2 is still up.
Expand All@@ -1133,9 +1146,9 @@ func TestRouteWithDownNIC(t *testing.T){
testNoRoute(t, s, unspecifiedNIC, tcpip.Address{}, nic1Dst)
testNoRoute(t, s, unspecifiedNIC, addr1, nic1Dst)
testNoRoute(t, s, nicID1, addr1, nic1Dst)
testRoute(t, s, unspecifiedNIC, tcpip.Address{}, nic2Dst, addr2, nic2RouteMTU)
testRoute(t, s, unspecifiedNIC, addr2, nic2Dst, addr2, nic2RouteMTU)
testRoute(t, s, nicID2, addr2, nic2Dst, addr2, nic2RouteMTU)
testRoute(t, s, unspecifiedNIC, tcpip.Address{}, nic2Dst, addr2, nic2RouteMTUAtNetworkLayer)
testRoute(t, s, unspecifiedNIC, addr2, nic2Dst, addr2, nic2RouteMTUAtNetworkLayer)
testRoute(t, s, nicID2, addr2, nic2Dst, addr2, nic2RouteMTUAtNetworkLayer)

// Bringing NIC2 down should result in no routes to even addresses. No
// route should be available to any address as routes to odd addresses
Expand All@@ -1157,9 +1170,9 @@ func TestRouteWithDownNIC(t *testing.T){
if err := upFn(s, nicID1); err != nil{
t.Fatalf("test.upFn(_, %d): %s", nicID1, err)
}
testRoute(t, s, unspecifiedNIC, tcpip.Address{}, nic1Dst, addr1, nic1RouteMTU)
testRoute(t, s, unspecifiedNIC, addr1, nic1Dst, addr1, nic1RouteMTU)
testRoute(t, s, nicID1, addr1, nic1Dst, addr1, nic1RouteMTU)
testRoute(t, s, unspecifiedNIC, tcpip.Address{}, nic1Dst, addr1, nic1RouteMTUAtNetworkLayer)
testRoute(t, s, unspecifiedNIC, addr1, nic1Dst, addr1, nic1RouteMTUAtNetworkLayer)
testRoute(t, s, nicID1, addr1, nic1Dst, addr1, nic1RouteMTUAtNetworkLayer)
testNoRoute(t, s, unspecifiedNIC, tcpip.Address{}, nic2Dst)
testNoRoute(t, s, unspecifiedNIC, addr2, nic2Dst)
testNoRoute(t, s, nicID2, addr2, nic2Dst)
Expand DownExpand Up@@ -1293,7 +1306,9 @@ func TestRoutes(t *testing.T){
// addresses through the first NIC, and all even destination address
// through the second one.
nic1RouteMTU := 1500
nic1RouteMTUAtNetworkLayer := nic1RouteMTU - fakeNetHeaderLen
nic2RouteMTU := 1460
nic2RouteMTUAtNetworkLayer := nic2RouteMTU - fakeNetHeaderLen
{
subnet0, err := tcpip.NewSubnet(tcpip.AddrFromSlice([]byte("\x00\x00\x00\x00")), tcpip.MaskFrom("\x01\x00\x00\x00"))
if err != nil{
Expand All@@ -1311,18 +1326,18 @@ func TestRoutes(t *testing.T){
}

// Test routes to odd address.
testRoute(t, s, 0, tcpip.Address{}, tcpip.AddrFromSlice([]byte("\x05\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x01\x00\x00\x00")), nic1RouteMTU)
testRoute(t, s, 0, tcpip.AddrFromSlice([]byte("\x01\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x05\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x01\x00\x00\x00")), nic1RouteMTU)
testRoute(t, s, 1, tcpip.AddrFromSlice([]byte("\x01\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x05\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x01\x00\x00\x00")), nic1RouteMTU)
testRoute(t, s, 0, tcpip.AddrFromSlice([]byte("\x03\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x05\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x03\x00\x00\x00")), nic1RouteMTU)
testRoute(t, s, 1, tcpip.AddrFromSlice([]byte("\x03\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x05\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x03\x00\x00\x00")), nic1RouteMTU)
testRoute(t, s, 0, tcpip.Address{}, tcpip.AddrFromSlice([]byte("\x05\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x01\x00\x00\x00")), nic1RouteMTUAtNetworkLayer)
testRoute(t, s, 0, tcpip.AddrFromSlice([]byte("\x01\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x05\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x01\x00\x00\x00")), nic1RouteMTUAtNetworkLayer)
testRoute(t, s, 1, tcpip.AddrFromSlice([]byte("\x01\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x05\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x01\x00\x00\x00")), nic1RouteMTUAtNetworkLayer)
testRoute(t, s, 0, tcpip.AddrFromSlice([]byte("\x03\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x05\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x03\x00\x00\x00")), nic1RouteMTUAtNetworkLayer)
testRoute(t, s, 1, tcpip.AddrFromSlice([]byte("\x03\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x05\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x03\x00\x00\x00")), nic1RouteMTUAtNetworkLayer)

// Test routes to even address.
testRoute(t, s, 0, tcpip.Address{}, tcpip.AddrFromSlice([]byte("\x06\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x04\x00\x00\x00")), nic2RouteMTU)
testRoute(t, s, 0, tcpip.AddrFromSlice([]byte("\x02\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x06\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x02\x00\x00\x00")), nic2RouteMTU)
testRoute(t, s, 2, tcpip.AddrFromSlice([]byte("\x02\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x06\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x02\x00\x00\x00")), nic2RouteMTU)
testRoute(t, s, 0, tcpip.AddrFromSlice([]byte("\x04\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x06\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x04\x00\x00\x00")), nic2RouteMTU)
testRoute(t, s, 2, tcpip.AddrFromSlice([]byte("\x04\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x06\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x04\x00\x00\x00")), nic2RouteMTU)
testRoute(t, s, 0, tcpip.Address{}, tcpip.AddrFromSlice([]byte("\x06\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x04\x00\x00\x00")), nic2RouteMTUAtNetworkLayer)
testRoute(t, s, 0, tcpip.AddrFromSlice([]byte("\x02\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x06\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x02\x00\x00\x00")), nic2RouteMTUAtNetworkLayer)
testRoute(t, s, 2, tcpip.AddrFromSlice([]byte("\x02\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x06\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x02\x00\x00\x00")), nic2RouteMTUAtNetworkLayer)
testRoute(t, s, 0, tcpip.AddrFromSlice([]byte("\x04\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x06\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x04\x00\x00\x00")), nic2RouteMTUAtNetworkLayer)
testRoute(t, s, 2, tcpip.AddrFromSlice([]byte("\x04\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x06\x00\x00\x00")), tcpip.AddrFromSlice([]byte("\x04\x00\x00\x00")), nic2RouteMTUAtNetworkLayer)

// Try to send to odd numbered address from even numbered ones, then
// vice-versa.
Expand Down
44 changes: 22 additions & 22 deletions runsc/boot/network.go
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Expand Up@@ -43,31 +43,29 @@ import (
"gvisor.dev/gvisor/runsc/config"
)

var (
// DefaultLoopbackLink contains IP addresses and routes of "127.0.0.1/8" and
// "::1/8" on "lo" interface.
DefaultLoopbackLink = LoopbackLink{
Name: "lo",
Addresses: []IPWithPrefix{
{Address: net.IP("\x7f\x00\x00\x01"), PrefixLen: 8},
{Address: net.IPv6loopback, PrefixLen: 128},
},
Routes: []Route{
{
Destination: net.IPNet{
IP: net.IPv4(0x7f, 0, 0, 0),
Mask: net.IPv4Mask(0xff, 0, 0, 0),
},
// DefaultLoopbackLink contains IP addresses and routes of "127.0.0.1/8" and
// "::1/8" on "lo" interface.
var DefaultLoopbackLink = LoopbackLink{
Name: "lo",
Addresses: []IPWithPrefix{
{Address: net.IP("\x7f\x00\x00\x01"), PrefixLen: 8},
{Address: net.IPv6loopback, PrefixLen: 128},
},
Routes: []Route{
{
Destination: net.IPNet{
IP: net.IPv4(0x7f, 0, 0, 0),
Mask: net.IPv4Mask(0xff, 0, 0, 0),
},
{
Destination: net.IPNet{
IP: net.IPv6loopback,
Mask: net.IPMask(strings.Repeat("\xff", net.IPv6len)),
},
},
{
Destination: net.IPNet{
IP: net.IPv6loopback,
Mask: net.IPMask(strings.Repeat("\xff", net.IPv6len)),
},
},
}
)
},
}

// Network exposes methods that can be used to configure a network stack.
type Network struct{
Expand All@@ -83,6 +81,7 @@ type Network struct{
type Route struct{
Destination net.IPNet
Gateway net.IP
MTU uint32
}

// DefaultRoute represents a catch all route to the default gateway.
Expand DownExpand Up@@ -220,6 +219,7 @@ func (r *Route) toTcpipRoute(id tcpip.NICID) (tcpip.Route, error){
Destination: subnet,
Gateway: ipToAddress(r.Gateway),
NIC: id,
MTU: r.MTU,
}, nil
}

Expand Down
5 changes: 5 additions & 0 deletions runsc/sandbox/network.go
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Expand Up@@ -506,6 +506,8 @@ func routesForIface(iface net.Interface, disableIPv6 bool) ([]boot.Route, *boot.
var defv4, defv6 *boot.Route
var routes []boot.Route
for _, r := range rs{
mtu := uint32(r.MTU)

// Is it a default route?
if r.Dst == nil{
if r.Gw == nil{
Expand All@@ -523,6 +525,7 @@ func routesForIface(iface net.Interface, disableIPv6 bool) ([]boot.Route, *boot.
Mask: net.IPMask(net.IPv4zero),
},
Gateway: r.Gw,
MTU: mtu,
}
case header.IPv6AddressSize:
if defv6 != nil{
Expand All@@ -536,6 +539,7 @@ func routesForIface(iface net.Interface, disableIPv6 bool) ([]boot.Route, *boot.
Mask: net.IPMask(net.IPv6zero),
},
Gateway: r.Gw,
MTU: mtu,
}
}
default:
Expand All@@ -552,6 +556,7 @@ func routesForIface(iface net.Interface, disableIPv6 bool) ([]boot.Route, *boot.
routes = append(routes, boot.Route{
Destination: dst,
Gateway: r.Gw,
MTU: mtu,
})
}
return routes, defv4, defv6, nil
Expand Down
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