mirror of
https://github.com/slackhq/nebula.git
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57 lines
1.8 KiB
Go
57 lines
1.8 KiB
Go
//go:build !e2e_testing
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package overlay
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import (
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"net/netip"
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"testing"
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"github.com/slackhq/nebula/config"
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"github.com/slackhq/nebula/routing"
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"github.com/slackhq/nebula/test"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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// Only tun.mtu changes. The system calls fail without a real device, what matters is the routes nebula keeps
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func TestReloadMTUOnlyKeepsRoutes(t *testing.T) {
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routes := " unsafe_routes:\n - route: 192.168.100.0/24\n via: 10.1.0.1\n"
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c := config.NewC(test.NewLogger())
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require.NoError(t, c.LoadString("tun:\n mtu: 1300\n"+routes))
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tn := &tun{
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l: test.NewLogger(),
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vpnNetworks: []netip.Prefix{netip.MustParsePrefix("10.1.0.2/24")},
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ioctlFd: ^uintptr(0),
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routesFromSystem: map[netip.Prefix]routing.Gateways{},
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}
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require.NoError(t, tn.reload(c, true))
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require.NoError(t, c.ReloadConfigString("tun:\n mtu: 1400\n"+routes))
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_ = tn.reload(c, false)
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got := *tn.Routes.Load()
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require.Len(t, got, 1)
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assert.Equal(t, netip.MustParsePrefix("192.168.100.0/24"), got[0].Cidr)
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assert.Equal(t, 1400, got[0].MTU)
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assert.Equal(t, 1400, tn.DefaultMTU)
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}
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// The device mtu has to fit the largest route mtu, wherever it sits in the list
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func TestReloadMaxMTUIsTheLargestRoute(t *testing.T) {
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c := config.NewC(test.NewLogger())
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require.NoError(t, c.LoadString("tun:\n mtu: 1300\n unsafe_routes:\n"+
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" - route: 192.168.100.0/24\n via: 10.1.0.1\n mtu: 1500\n"+
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" - route: 192.168.101.0/24\n via: 10.1.0.1\n mtu: 1400\n"))
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tn := &tun{
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l: test.NewLogger(),
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vpnNetworks: []netip.Prefix{netip.MustParsePrefix("10.1.0.2/24")},
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ioctlFd: ^uintptr(0),
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routesFromSystem: map[netip.Prefix]routing.Gateways{},
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}
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require.NoError(t, tn.reload(c, true))
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assert.Equal(t, 1500, tn.MaxMTU)
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assert.Equal(t, 1300, tn.DefaultMTU)
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}
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