archive
/
tailscale
mirror of https://github.com/tailscale/tailscale/
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

appc: unadvertise routes when reconfiguring app connector

Browse Source 
If the controlknob to persist app connector routes is enabled, when
reconfiguring an app connector unadvertise routes that are no longer
relevant.

Updates #11008
Signed-off-by: Fran Bull <fran@tailscale.com>
pull/11918/head
Fran Bull 7 months ago committed by franbull
parent fea2e73bc1
commit c27dc1ca31
2 changed files with 205 additions and 2 deletions
Show Stats Download Patch File Download Diff File

37
appc/appconnector.go
Unescape Escape View File

@ -23,6 +23,7 @@ import (
"tailscale.com/util/dnsname"
"tailscale.com/util/execqueue"
"tailscale.com/util/mak"
"tailscale.com/util/slicesx"
)
// RouteAdvertiser is an interface that allows the AppConnector to advertise
@ -166,10 +167,26 @@ func (e *AppConnector) updateDomains(domains []string) {
for _, wc := range e.wildcards {
if dnsname.HasSuffix(d, wc) {
e.domains[d] = addrs
delete(oldDomains, d)
break
}
}
}
// Everything left in oldDomains is a domain we're no longer tracking
// and if we are storing route info we can unadvertise the routes
if e.ShouldStoreRoutes() {
toRemove := []netip.Prefix{}
for _, addrs := range oldDomains {
for _, a := range addrs {
toRemove = append(toRemove, netip.PrefixFrom(a, a.BitLen()))
}
}
if err := e.routeAdvertiser.UnadvertiseRoute(toRemove...); err != nil {
e.logf("failed to unadvertise routes on domain removal: %v: %v: %v", xmaps.Keys(oldDomains), toRemove, err)
}
}
e.logf("handling domains: %v and wildcards: %v", xmaps.Keys(e.domains), e.wildcards)
}
@ -193,6 +210,14 @@ func (e *AppConnector) updateRoutes(routes []netip.Prefix) {
var toRemove []netip.Prefix
// If we're storing routes and know e.controlRoutes is a good
// representation of what should be in AdvertisedRoutes we can stop
// advertising routes that used to be in e.controlRoutes but are not
// in routes.
if e.ShouldStoreRoutes() {
toRemove = routesWithout(e.controlRoutes, routes)
}
nextRoute:
for _, r := range routes {
for _, addr := range e.domains {
@ -447,3 +472,15 @@ func (e *AppConnector) addDomainAddrLocked(domain string, addr netip.Addr) {
func compareAddr(l, r netip.Addr) int {
return l.Compare(r)
}
// routesWithout returns a without b where a and b
// are unsorted slices of netip.Prefix
func routesWithout(a, b []netip.Prefix) []netip.Prefix {
m := make(map[netip.Prefix]bool, len(b))
for _, p := range b {
m[p] = true
}
return slicesx.Filter(make([]netip.Prefix, 0, len(a)), a, func(p netip.Prefix) bool {
return !m[p]
})
}

170
appc/appconnector_test.go
Unescape Escape View File

@ -24,9 +24,9 @@ func TestUpdateDomains(t *testing.T) {
ctx := context.Background()
var a *AppConnector
if shouldStore {
a = NewAppConnector(t.Logf, nil, &RouteInfo{}, fakeStoreRoutes)
a = NewAppConnector(t.Logf, &appctest.RouteCollector{}, &RouteInfo{}, fakeStoreRoutes)
} else {
a = NewAppConnector(t.Logf, nil, nil, nil)
a = NewAppConnector(t.Logf, &appctest.RouteCollector{}, nil, nil)
}
a.UpdateDomains([]string{"example.com"})
@ -354,3 +354,169 @@ func prefixCompare(a, b netip.Prefix) int {
}
return a.Addr().Compare(b.Addr())
}
func prefixes(in ...string) []netip.Prefix {
toRet := make([]netip.Prefix, len(in))
for i, s := range in {
toRet[i] = netip.MustParsePrefix(s)
}
return toRet
}
func TestUpdateRouteRouteRemoval(t *testing.T) {
for _, shouldStore := range []bool{false, true} {
ctx := context.Background()
rc := &appctest.RouteCollector{}
assertRoutes := func(prefix string, routes, removedRoutes []netip.Prefix) {
if !slices.Equal(routes, rc.Routes()) {
t.Fatalf("%s: (shouldStore=%t) routes want %v, got %v", prefix, shouldStore, routes, rc.Routes())
}
if !slices.Equal(removedRoutes, rc.RemovedRoutes()) {
t.Fatalf("%s: (shouldStore=%t) removedRoutes want %v, got %v", prefix, shouldStore, removedRoutes, rc.RemovedRoutes())
}
}
var a *AppConnector
if shouldStore {
a = NewAppConnector(t.Logf, rc, &RouteInfo{}, fakeStoreRoutes)
} else {
a = NewAppConnector(t.Logf, rc, nil, nil)
}
// nothing has yet been advertised
assertRoutes("appc init", []netip.Prefix{}, []netip.Prefix{})
a.UpdateDomainsAndRoutes([]string{}, prefixes("1.2.3.1/32", "1.2.3.2/32"))
a.Wait(ctx)
// the routes passed to UpdateDomainsAndRoutes have been advertised
assertRoutes("simple update", prefixes("1.2.3.1/32", "1.2.3.2/32"), []netip.Prefix{})
// one route the same, one different
a.UpdateDomainsAndRoutes([]string{}, prefixes("1.2.3.1/32", "1.2.3.3/32"))
a.Wait(ctx)
// old behavior: routes are not removed, resulting routes are both old and new
// (we have dupe 1.2.3.1 routes because the test RouteAdvertiser doesn't have the deduplication
// the real one does)
wantRoutes := prefixes("1.2.3.1/32", "1.2.3.2/32", "1.2.3.1/32", "1.2.3.3/32")
wantRemovedRoutes := []netip.Prefix{}
if shouldStore {
// new behavior: routes are removed, resulting routes are new only
wantRoutes = prefixes("1.2.3.1/32", "1.2.3.1/32", "1.2.3.3/32")
wantRemovedRoutes = prefixes("1.2.3.2/32")
}
assertRoutes("removal", wantRoutes, wantRemovedRoutes)
}
}
func TestUpdateDomainRouteRemoval(t *testing.T) {
for _, shouldStore := range []bool{false, true} {
ctx := context.Background()
rc := &appctest.RouteCollector{}
assertRoutes := func(prefix string, routes, removedRoutes []netip.Prefix) {
if !slices.Equal(routes, rc.Routes()) {
t.Fatalf("%s: (shouldStore=%t) routes want %v, got %v", prefix, shouldStore, routes, rc.Routes())
}
if !slices.Equal(removedRoutes, rc.RemovedRoutes()) {
t.Fatalf("%s: (shouldStore=%t) removedRoutes want %v, got %v", prefix, shouldStore, removedRoutes, rc.RemovedRoutes())
}
}
var a *AppConnector
if shouldStore {
a = NewAppConnector(t.Logf, rc, &RouteInfo{}, fakeStoreRoutes)
} else {
a = NewAppConnector(t.Logf, rc, nil, nil)
}
assertRoutes("appc init", []netip.Prefix{}, []netip.Prefix{})
a.UpdateDomainsAndRoutes([]string{"a.example.com", "b.example.com"}, []netip.Prefix{})
a.Wait(ctx)
// adding domains doesn't immediately cause any routes to be advertised
assertRoutes("update domains", []netip.Prefix{}, []netip.Prefix{})
a.ObserveDNSResponse(dnsResponse("a.example.com.", "1.2.3.1"))
a.ObserveDNSResponse(dnsResponse("a.example.com.", "1.2.3.2"))
a.ObserveDNSResponse(dnsResponse("b.example.com.", "1.2.3.3"))
a.ObserveDNSResponse(dnsResponse("b.example.com.", "1.2.3.4"))
a.Wait(ctx)
// observing dns responses causes routes to be advertised
assertRoutes("observed dns", prefixes("1.2.3.1/32", "1.2.3.2/32", "1.2.3.3/32", "1.2.3.4/32"), []netip.Prefix{})
a.UpdateDomainsAndRoutes([]string{"a.example.com"}, []netip.Prefix{})
a.Wait(ctx)
// old behavior, routes are not removed
wantRoutes := prefixes("1.2.3.1/32", "1.2.3.2/32", "1.2.3.3/32", "1.2.3.4/32")
wantRemovedRoutes := []netip.Prefix{}
if shouldStore {
// new behavior, routes are removed for b.example.com
wantRoutes = prefixes("1.2.3.1/32", "1.2.3.2/32")
wantRemovedRoutes = prefixes("1.2.3.3/32", "1.2.3.4/32")
}
assertRoutes("removal", wantRoutes, wantRemovedRoutes)
}
}
func TestUpdateWildcardRouteRemoval(t *testing.T) {
for _, shouldStore := range []bool{false, true} {
ctx := context.Background()
rc := &appctest.RouteCollector{}
assertRoutes := func(prefix string, routes, removedRoutes []netip.Prefix) {
if !slices.Equal(routes, rc.Routes()) {
t.Fatalf("%s: (shouldStore=%t) routes want %v, got %v", prefix, shouldStore, routes, rc.Routes())
}
if !slices.Equal(removedRoutes, rc.RemovedRoutes()) {
t.Fatalf("%s: (shouldStore=%t) removedRoutes want %v, got %v", prefix, shouldStore, removedRoutes, rc.RemovedRoutes())
}
}
var a *AppConnector
if shouldStore {
a = NewAppConnector(t.Logf, rc, &RouteInfo{}, fakeStoreRoutes)
} else {
a = NewAppConnector(t.Logf, rc, nil, nil)
}
assertRoutes("appc init", []netip.Prefix{}, []netip.Prefix{})
a.UpdateDomainsAndRoutes([]string{"a.example.com", "*.b.example.com"}, []netip.Prefix{})
a.Wait(ctx)
// adding domains doesn't immediately cause any routes to be advertised
assertRoutes("update domains", []netip.Prefix{}, []netip.Prefix{})
a.ObserveDNSResponse(dnsResponse("a.example.com.", "1.2.3.1"))
a.ObserveDNSResponse(dnsResponse("a.example.com.", "1.2.3.2"))
a.ObserveDNSResponse(dnsResponse("1.b.example.com.", "1.2.3.3"))
a.ObserveDNSResponse(dnsResponse("2.b.example.com.", "1.2.3.4"))
a.Wait(ctx)
// observing dns responses causes routes to be advertised
assertRoutes("observed dns", prefixes("1.2.3.1/32", "1.2.3.2/32", "1.2.3.3/32", "1.2.3.4/32"), []netip.Prefix{})
a.UpdateDomainsAndRoutes([]string{"a.example.com"}, []netip.Prefix{})
a.Wait(ctx)
// old behavior, routes are not removed
wantRoutes := prefixes("1.2.3.1/32", "1.2.3.2/32", "1.2.3.3/32", "1.2.3.4/32")
wantRemovedRoutes := []netip.Prefix{}
if shouldStore {
// new behavior, routes are removed for *.b.example.com
wantRoutes = prefixes("1.2.3.1/32", "1.2.3.2/32")
wantRemovedRoutes = prefixes("1.2.3.3/32", "1.2.3.4/32")
}
assertRoutes("removal", wantRoutes, wantRemovedRoutes)
}
}
func TestRoutesWithout(t *testing.T) {
assert := func(msg string, got, want []netip.Prefix) {
if !slices.Equal(want, got) {
t.Errorf("%s: want %v, got %v", msg, want, got)
}
}
assert("empty routes", routesWithout([]netip.Prefix{}, []netip.Prefix{}), []netip.Prefix{})
assert("a empty", routesWithout([]netip.Prefix{}, prefixes("1.1.1.1/32", "1.1.1.2/32")), []netip.Prefix{})
assert("b empty", routesWithout(prefixes("1.1.1.1/32", "1.1.1.2/32"), []netip.Prefix{}), prefixes("1.1.1.1/32", "1.1.1.2/32"))
assert("no overlap", routesWithout(prefixes("1.1.1.1/32", "1.1.1.2/32"), prefixes("1.1.1.3/32", "1.1.1.4/32")), prefixes("1.1.1.1/32", "1.1.1.2/32"))
assert("a has fewer", routesWithout(prefixes("1.1.1.1/32", "1.1.1.2/32"), prefixes("1.1.1.1/32", "1.1.1.2/32", "1.1.1.3/32", "1.1.1.4/32")), []netip.Prefix{})
assert("a has more", routesWithout(prefixes("1.1.1.1/32", "1.1.1.2/32", "1.1.1.3/32", "1.1.1.4/32"), prefixes("1.1.1.1/32", "1.1.1.3/32")), prefixes("1.1.1.2/32", "1.1.1.4/32"))
}

Write Preview
Loading…
Cancel
Save