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package bridge
import (
"net"
"net/netip"
"strings"
"testing"
"github.com/docker/docker/internal/nlwrap"
"github.com/docker/docker/internal/testutils/netnsutils"
"github.com/google/go-cmp/cmp"
"github.com/vishvananda/netlink"
"gotest.tools/v3/assert"
is "gotest.tools/v3/assert/cmp"
)
func cidrToIPNet(t *testing.T, cidr string) *net.IPNet {
t.Helper()
ip, ipNet, err := net.ParseCIDR(cidr)
assert.Assert(t, is.Nil(err))
return &net.IPNet{IP: ip, Mask: ipNet.Mask}
}
func addAddr(t *testing.T, link netlink.Link, addr string) {
t.Helper()
ipNet := cidrToIPNet(t, addr)
err := netlink.AddrAdd(link, &netlink.Addr{IPNet: ipNet})
assert.Assert(t, is.Nil(err))
}
func prepTestBridge(t *testing.T, nc *networkConfiguration) *bridgeInterface {
t.Helper()
nh, err := nlwrap.NewHandle()
assert.Assert(t, err)
i, err := newInterface(nh, nc)
assert.Assert(t, err)
err = setupDevice(nc, i)
assert.Assert(t, err)
return i
}
func TestInterfaceDefaultName(t *testing.T) {
defer netnsutils.SetupTestOSContext(t)()
nh, err := nlwrap.NewHandle()
if err != nil {
t.Fatal(err)
}
config := &networkConfiguration{}
_, err = newInterface(nh, config)
assert.Check(t, err)
assert.Equal(t, config.BridgeName, DefaultBridgeName)
}
func TestAddressesNoInterface(t *testing.T) {
i := bridgeInterface{}
addrs, err := i.addresses(netlink.FAMILY_V6)
assert.NilError(t, err)
assert.Check(t, is.Len(addrs, 0))
}
func TestAddressesEmptyInterface(t *testing.T) {
defer netnsutils.SetupTestOSContext(t)()
nh, err := nlwrap.NewHandle()
assert.NilError(t, err)
inf, err := newInterface(nh, &networkConfiguration{})
assert.NilError(t, err)
addrsv4, err := inf.addresses(netlink.FAMILY_V4)
assert.NilError(t, err)
assert.Check(t, is.Len(addrsv4, 0))
addrsv6, err := inf.addresses(netlink.FAMILY_V6)
assert.NilError(t, err)
assert.Check(t, is.Len(addrsv6, 0))
}
func TestAddressesNonEmptyInterface(t *testing.T) {
defer netnsutils.SetupTestOSContext(t)()
i := prepTestBridge(t, &networkConfiguration{})
const expAddrV4, expAddrV6 = "192.168.1.2/24", "fd00:1234::/64"
addAddr(t, i.Link, expAddrV4)
addAddr(t, i.Link, expAddrV6)
addrs, err := i.addresses(netlink.FAMILY_V4)
assert.NilError(t, err)
assert.Check(t, is.Len(addrs, 1))
assert.Equal(t, addrs[0].IPNet.String(), expAddrV4)
addrs, err = i.addresses(netlink.FAMILY_V6)
assert.NilError(t, err)
assert.Check(t, is.Len(addrs, 1))
assert.Equal(t, addrs[0].IPNet.String(), expAddrV6)
}
func TestGetRequiredIPv6Addrs(t *testing.T) {
testcases := []struct {
name string
addressIPv6 string
expReqdAddrs []string
}{
{
name: "Regular address, expect default link local",
addressIPv6: "2000:3000::1/80",
expReqdAddrs: []string{"fe80::1/64", "2000:3000::1/80"},
},
{
name: "Standard link local address only",
addressIPv6: "fe80::1/64",
expReqdAddrs: []string{"fe80::1/64"},
},
{
name: "Nonstandard link local address",
addressIPv6: "fe80:abcd::1/42",
expReqdAddrs: []string{"fe80:abcd::1/42", "fe80::1/64"},
},
}
for _, tc := range testcases {
t.Run(tc.name, func(t *testing.T) {
config := &networkConfiguration{
AddressIPv6: cidrToIPNet(t, tc.addressIPv6),
}
expResult := map[netip.Addr]netip.Prefix{}
for _, addr := range tc.expReqdAddrs {
expResult[netip.MustParseAddr(strings.Split(addr, "/")[0])] = netip.MustParsePrefix(addr)
}
reqd, err := getRequiredIPv6Addrs(config)
assert.Check(t, is.Nil(err))
assert.Check(t, is.DeepEqual(reqd, expResult,
cmp.Comparer(func(a, b netip.Prefix) bool { return a == b })))
})
}
}
func TestProgramIPv6Addresses(t *testing.T) {
defer netnsutils.SetupTestOSContext(t)()
checkAddrs := func(i *bridgeInterface, nc *networkConfiguration, expAddrs []string) {
t.Helper()
exp := []netlink.Addr{}
for _, a := range expAddrs {
ipNet := cidrToIPNet(t, a)
exp = append(exp, netlink.Addr{IPNet: ipNet})
}
actual, err := i.addresses(netlink.FAMILY_V6)
assert.NilError(t, err)
assert.DeepEqual(t, exp, actual)
assert.Check(t, is.DeepEqual(i.bridgeIPv6, nc.AddressIPv6))
assert.Check(t, is.DeepEqual(i.gatewayIPv6, nc.AddressIPv6.IP))
}
nc := &networkConfiguration{}
i := prepTestBridge(t, nc)
// The bridge has no addresses, ask for a regular IPv6 network and expect it to
// be added to the bridge, with the default link local address.
nc.AddressIPv6 = cidrToIPNet(t, "2000:3000::1/64")
err := i.programIPv6Addresses(nc)
assert.NilError(t, err)
checkAddrs(i, nc, []string{"2000:3000::1/64", "fe80::1/64"})
// Shrink the subnet of that regular address, the prefix length of the address
// will not be modified - but it's informational-only, the address itself has
// not changed.
nc.AddressIPv6 = cidrToIPNet(t, "2000:3000::1/80")
err = i.programIPv6Addresses(nc)
assert.NilError(t, err)
checkAddrs(i, nc, []string{"2000:3000::1/64", "fe80::1/64"})
// Ask for link-local only, by specifying an address with the Link Local prefix.
// The regular address should be removed.
nc.AddressIPv6 = cidrToIPNet(t, "fe80::1/64")
err = i.programIPv6Addresses(nc)
assert.NilError(t, err)
checkAddrs(i, nc, []string{"fe80::1/64"})
// Swap the standard link local address for a nonstandard one.
nc.AddressIPv6 = cidrToIPNet(t, "fe80:5555::1/55")
err = i.programIPv6Addresses(nc)
assert.NilError(t, err)
checkAddrs(i, nc, []string{"fe80:5555::1/55", "fe80::1/64"})
}
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