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ipn/ipnlocal: make IPv6 OS routes be a single /48 for our ULA space

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And if we have over 10,000 CGNAT routes, just route the entire
CGNAT range. (for the hello test server)

Fixes #1450

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2021-03-04 12:04:31 -08:00
committed by Brad Fitzpatrick
parent a6d098c750
commit 82edf94df7
2 changed files with 135 additions and 5 deletions
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94
ipn/ipnlocal/local_test.go
View File

@@ -5,12 +5,14 @@
package ipnlocal
import (
"reflect"
"testing"
"inet.af/netaddr"
"tailscale.com/net/tsaddr"
"tailscale.com/tailcfg"
"tailscale.com/types/netmap"
"tailscale.com/wgengine/wgcfg"
)
func TestNetworkMapCompare(t *testing.T) {
@@ -171,3 +173,95 @@ func TestShrinkDefaultRoute(t *testing.T) {
}
}
}
func TestPeerRoutes(t *testing.T) {
pp := netaddr.MustParseIPPrefix
tests := []struct {
name string
peers []wgcfg.Peer
want []netaddr.IPPrefix
}{
{
name: "small_v4",
peers: []wgcfg.Peer{
{
AllowedIPs: []netaddr.IPPrefix{
pp("100.101.102.103/32"),
},
},
},
want: []netaddr.IPPrefix{
pp("100.101.102.103/32"),
},
},
{
name: "big_v4",
peers: []wgcfg.Peer{
{
AllowedIPs: []netaddr.IPPrefix{
pp("100.101.102.103/32"),
pp("100.101.102.104/32"),
pp("100.101.102.105/32"),
},
},
},
want: []netaddr.IPPrefix{
pp("100.64.0.0/10"),
},
},
{
name: "has_1_v6",
peers: []wgcfg.Peer{
{
AllowedIPs: []netaddr.IPPrefix{
pp("fd7a:115c:a1e0:ab12:4843:cd96:6258:b240/128"),
},
},
},
want: []netaddr.IPPrefix{
pp("fd7a:115c:a1e0::/48"),
},
},
{
name: "has_2_v6",
peers: []wgcfg.Peer{
{
AllowedIPs: []netaddr.IPPrefix{
pp("fd7a:115c:a1e0:ab12:4843:cd96:6258:b240/128"),
pp("fd7a:115c:a1e0:ab12:4843:cd96:6258:b241/128"),
},
},
},
want: []netaddr.IPPrefix{
pp("fd7a:115c:a1e0::/48"),
},
},
{
name: "big_v4_big_v6",
peers: []wgcfg.Peer{
{
AllowedIPs: []netaddr.IPPrefix{
pp("100.101.102.103/32"),
pp("100.101.102.104/32"),
pp("100.101.102.105/32"),
pp("fd7a:115c:a1e0:ab12:4843:cd96:6258:b240/128"),
pp("fd7a:115c:a1e0:ab12:4843:cd96:6258:b241/128"),
},
},
},
want: []netaddr.IPPrefix{
pp("fd7a:115c:a1e0::/48"),
pp("100.64.0.0/10"),
},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
got := peerRoutes(tt.peers, 2)
if !reflect.DeepEqual(got, tt.want) {
t.Errorf("got = %v; want %v", got, tt.want)
}
})
}
}