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ipnlocal, magicsock: store last suggested exit node id in local backend (#11959)

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Updates tailscale/corp#19681

Signed-off-by: Claire Wang <claire@tailscale.com>
clairew/revert-storing-last-suggested
Claire Wang 7 months ago committed by GitHub
parent b62cfc430a
commit 35872e86d2
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
3 changed files with 401 additions and 3 deletions
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42
ipn/ipnlocal/local.go
Unescape Escape View File

@ -151,6 +151,12 @@ type watchSession struct {
sessionID string
}
// lastSuggestedExitNode stores the last suggested exit node ID and name in local backend.
type lastSuggestedExitNode struct {
id tailcfg.StableNodeID
name string
}
// LocalBackend is the glue between the major pieces of the Tailscale
// network software: the cloud control plane (via controlclient), the
// network data plane (via wgengine), and the user-facing UIs and CLIs
@ -324,6 +330,10 @@ type LocalBackend struct {
// outgoingFiles keeps track of Taildrop outgoing files keyed to their OutgoingFile.ID
outgoingFiles map[string]*ipn.OutgoingFile
// lastSuggestedExitNode stores the last suggested exit node ID and name.
// lastSuggestedExitNode updates whenever the suggestion changes.
lastSuggestedExitNode lastSuggestedExitNode
}
// HealthTracker returns the health tracker for the backend.
@ -5957,6 +5967,7 @@ func (b *LocalBackend) resetForProfileChangeLockedOnEntry(unlock unlockOnce) err
}
b.lastServeConfJSON = mem.B(nil)
b.serveConfig = ipn.ServeConfigView{}
b.lastSuggestedExitNode = lastSuggestedExitNode{} // Reset last suggested exit node.
b.enterStateLockedOnEntry(ipn.NoState, unlock) // Reset state; releases b.mu
b.health.SetLocalLogConfigHealth(nil)
return b.Start(ipn.Options{})
@ -6334,6 +6345,7 @@ func mayDeref[T any](p *T) (v T) {
var ErrNoPreferredDERP = errors.New("no preferred DERP, try again later")
var ErrCannotSuggestExitNode = errors.New("unable to suggest an exit node, try again later")
var ErrUnableToSuggestLastExitNode = errors.New("unable to suggest last exit node")
// SuggestExitNode computes a suggestion based on the current netmap and last netcheck report. If
// there are multiple equally good options, one is selected at random, so the result is not stable. To be
@ -6346,13 +6358,41 @@ func (b *LocalBackend) SuggestExitNode() (response apitype.ExitNodeSuggestionRes
b.mu.Lock()
lastReport := b.MagicConn().GetLastNetcheckReport(b.ctx)
netMap := b.netMap
lastSuggestedExitNode := b.lastSuggestedExitNode
b.mu.Unlock()
if lastReport == nil || netMap == nil {
last, err := suggestLastExitNode(lastSuggestedExitNode)
if err != nil {
return response, ErrCannotSuggestExitNode
}
return last, err
}
seed := time.Now().UnixNano()
r := rand.New(rand.NewSource(seed))
return suggestExitNode(lastReport, netMap, r)
res, err := suggestExitNode(lastReport, netMap, r)
if err != nil {
last, err := suggestLastExitNode(lastSuggestedExitNode)
if err != nil {
return response, ErrCannotSuggestExitNode
}
return last, err
}
b.mu.Lock()
b.lastSuggestedExitNode.id = res.ID
b.lastSuggestedExitNode.name = res.Name
b.mu.Unlock()
return res, err
}
// suggestLastExitNode formats a response with the last suggested exit node's ID and name.
// Used as a fallback before returning a nil response and error.
func suggestLastExitNode(lastSuggestedExitNode lastSuggestedExitNode) (res apitype.ExitNodeSuggestionResponse, err error) {
if lastSuggestedExitNode.id != "" && lastSuggestedExitNode.name != "" {
res.ID = lastSuggestedExitNode.id
res.Name = lastSuggestedExitNode.name
return res, nil
}
return res, ErrUnableToSuggestLastExitNode
}
func suggestExitNode(report *netcheck.Report, netMap *netmap.NetworkMap, r *rand.Rand) (res apitype.ExitNodeSuggestionResponse, err error) {

352
ipn/ipnlocal/local_test.go
Unescape Escape View File

@ -25,6 +25,7 @@ import (
"golang.org/x/net/dns/dnsmessage"
"tailscale.com/appc"
"tailscale.com/appc/appctest"
"tailscale.com/client/tailscale/apitype"
"tailscale.com/clientupdate"
"tailscale.com/control/controlclient"
"tailscale.com/drive"
@ -3437,6 +3438,357 @@ func TestMinLatencyDERPregion(t *testing.T) {
}
}
func TestSuggestLastExitNode(t *testing.T) {
tests := []struct {
name string
lastSuggestedExitNode lastSuggestedExitNode
wantRes apitype.ExitNodeSuggestionResponse
wantLastSuggestedExitNode lastSuggestedExitNode
wantErr error
}{
{
name: "last suggested exit node is populated",
lastSuggestedExitNode: lastSuggestedExitNode{id: "test", name: "test"},
wantRes: apitype.ExitNodeSuggestionResponse{ID: "test", Name: "test"},
wantLastSuggestedExitNode: lastSuggestedExitNode{id: "test", name: "test"},
},
{
name: "last suggested exit node is not populated",
wantErr: ErrUnableToSuggestLastExitNode,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
got, err := suggestLastExitNode(tt.lastSuggestedExitNode)
if got != tt.wantRes || err != tt.wantErr {
t.Errorf("got %v error %v, want %v error %v", got, err, tt.wantRes, tt.wantErr)
}
})
}
}
func TestLocalBackendSuggestExitNode(t *testing.T) {
tests := []struct {
name string
lastSuggestedExitNode lastSuggestedExitNode
report netcheck.Report
netMap netmap.NetworkMap
wantID tailcfg.StableNodeID
wantName string
wantErr error
wantLastSuggestedExitNode lastSuggestedExitNode
}{
{
name: "nil netmap, returns last suggested exit node",
lastSuggestedExitNode: lastSuggestedExitNode{name: "test", id: "test"},
report: netcheck.Report{
RegionLatency: map[int]time.Duration{
1: 0,
2: -1,
3: 0,
},
},
wantID: "test",
wantName: "test",
wantLastSuggestedExitNode: lastSuggestedExitNode{name: "test", id: "test"},
},
{
name: "nil report, returns last suggested exit node",
lastSuggestedExitNode: lastSuggestedExitNode{name: "test", id: "test"},
netMap: netmap.NetworkMap{
SelfNode: (&tailcfg.Node{
Addresses: []netip.Prefix{
netip.MustParsePrefix("100.64.1.1/32"),
netip.MustParsePrefix("fe70::1/128"),
},
}).View(),
DERPMap: &tailcfg.DERPMap{
Regions: map[int]*tailcfg.DERPRegion{
1: {},
2: {},
3: {},
},
},
},
wantID: "test",
wantName: "test",
wantLastSuggestedExitNode: lastSuggestedExitNode{name: "test", id: "test"},
},
{
name: "found better derp node, last suggested exit node updates",
lastSuggestedExitNode: lastSuggestedExitNode{name: "test", id: "test"},
report: netcheck.Report{
RegionLatency: map[int]time.Duration{
1: 10,
2: 10,
3: 5,
},
PreferredDERP: 1,
},
netMap: netmap.NetworkMap{
SelfNode: (&tailcfg.Node{
Addresses: []netip.Prefix{
netip.MustParsePrefix("100.64.1.1/32"),
netip.MustParsePrefix("fe70::1/128"),
},
}).View(),
DERPMap: &tailcfg.DERPMap{
Regions: map[int]*tailcfg.DERPRegion{
1: {},
2: {},
3: {},
},
},
Peers: []tailcfg.NodeView{
(&tailcfg.Node{
ID: 2,
StableID: "test",
Name: "test",
DERP: "127.3.3.40:1",
AllowedIPs: []netip.Prefix{
netip.MustParsePrefix("0.0.0.0/0"), netip.MustParsePrefix("::/0"),
},
CapMap: (tailcfg.NodeCapMap)(map[tailcfg.NodeCapability][]tailcfg.RawMessage{
tailcfg.NodeAttrSuggestExitNode: {},
}),
}).View(),
(&tailcfg.Node{
ID: 3,
StableID: "foo",
Name: "foo",
DERP: "127.3.3.40:3",
AllowedIPs: []netip.Prefix{
netip.MustParsePrefix("0.0.0.0/0"), netip.MustParsePrefix("::/0"),
},
CapMap: (tailcfg.NodeCapMap)(map[tailcfg.NodeCapability][]tailcfg.RawMessage{
tailcfg.NodeAttrSuggestExitNode: {},
}),
}).View(),
},
},
wantID: "foo",
wantName: "foo",
wantLastSuggestedExitNode: lastSuggestedExitNode{name: "foo", id: "foo"},
},
{
name: "found better mullvad node, last suggested exit node updates",
lastSuggestedExitNode: lastSuggestedExitNode{name: "San Jose", id: "3"},
report: netcheck.Report{
RegionLatency: map[int]time.Duration{
1: 0,
2: 0,
3: 0,
},
PreferredDERP: 1,
},
netMap: netmap.NetworkMap{
SelfNode: (&tailcfg.Node{
Addresses: []netip.Prefix{
netip.MustParsePrefix("100.64.1.1/32"),
netip.MustParsePrefix("fe70::1/128"),
},
}).View(),
DERPMap: &tailcfg.DERPMap{
Regions: map[int]*tailcfg.DERPRegion{
1: {
Latitude: 40.73061,
Longitude: -73.935242,
},
2: {},
3: {},
},
},
Peers: []tailcfg.NodeView{
(&tailcfg.Node{
ID: 2,
StableID: "2",
AllowedIPs: []netip.Prefix{
netip.MustParsePrefix("0.0.0.0/0"), netip.MustParsePrefix("::/0"),
},
Name: "Dallas",
Hostinfo: (&tailcfg.Hostinfo{
Location: &tailcfg.Location{
Latitude: 32.89748,
Longitude: -97.040443,
Priority: 100,
},
}).View(),
CapMap: (tailcfg.NodeCapMap)(map[tailcfg.NodeCapability][]tailcfg.RawMessage{
tailcfg.NodeAttrSuggestExitNode: {},
}),
}).View(),
(&tailcfg.Node{
ID: 3,
StableID: "3",
AllowedIPs: []netip.Prefix{
netip.MustParsePrefix("0.0.0.0/0"), netip.MustParsePrefix("::/0"),
},
Name: "San Jose",
Hostinfo: (&tailcfg.Hostinfo{
Location: &tailcfg.Location{
Latitude: 37.3382082,
Longitude: -121.8863286,
Priority: 20,
},
}).View(),
CapMap: (tailcfg.NodeCapMap)(map[tailcfg.NodeCapability][]tailcfg.RawMessage{
tailcfg.NodeAttrSuggestExitNode: {},
}),
}).View(),
},
},
wantID: "2",
wantName: "Dallas",
wantLastSuggestedExitNode: lastSuggestedExitNode{name: "Dallas", id: "2"},
},
{
name: "ErrNoPreferredDERP, use last suggested exit node",
lastSuggestedExitNode: lastSuggestedExitNode{name: "test", id: "test"},
report: netcheck.Report{
RegionLatency: map[int]time.Duration{
1: 10,
2: 10,
3: 5,
},
PreferredDERP: 0,
},
netMap: netmap.NetworkMap{
SelfNode: (&tailcfg.Node{
Addresses: []netip.Prefix{
netip.MustParsePrefix("100.64.1.1/32"),
netip.MustParsePrefix("fe70::1/128"),
},
}).View(),
DERPMap: &tailcfg.DERPMap{
Regions: map[int]*tailcfg.DERPRegion{
1: {},
2: {},
3: {},
},
},
Peers: []tailcfg.NodeView{
(&tailcfg.Node{
ID: 2,
StableID: "test",
Name: "test",
DERP: "127.3.3.40:1",
AllowedIPs: []netip.Prefix{
netip.MustParsePrefix("0.0.0.0/0"), netip.MustParsePrefix("::/0"),
},
CapMap: (tailcfg.NodeCapMap)(map[tailcfg.NodeCapability][]tailcfg.RawMessage{
tailcfg.NodeAttrSuggestExitNode: {},
}),
}).View(),
(&tailcfg.Node{
ID: 3,
StableID: "foo",
Name: "foo",
DERP: "127.3.3.40:3",
AllowedIPs: []netip.Prefix{
netip.MustParsePrefix("0.0.0.0/0"), netip.MustParsePrefix("::/0"),
},
CapMap: (tailcfg.NodeCapMap)(map[tailcfg.NodeCapability][]tailcfg.RawMessage{
tailcfg.NodeAttrSuggestExitNode: {},
}),
}).View(),
},
},
wantID: "test",
wantName: "test",
wantLastSuggestedExitNode: lastSuggestedExitNode{name: "test", id: "test"},
},
{
name: "ErrNoPreferredDERP, use last suggested exit node",
lastSuggestedExitNode: lastSuggestedExitNode{name: "test", id: "test"},
report: netcheck.Report{
RegionLatency: map[int]time.Duration{
1: 10,
2: 10,
3: 5,
},
PreferredDERP: 0,
},
netMap: netmap.NetworkMap{
SelfNode: (&tailcfg.Node{
Addresses: []netip.Prefix{
netip.MustParsePrefix("100.64.1.1/32"),
netip.MustParsePrefix("fe70::1/128"),
},
}).View(),
DERPMap: &tailcfg.DERPMap{
Regions: map[int]*tailcfg.DERPRegion{
1: {},
2: {},
3: {},
},
},
Peers: []tailcfg.NodeView{
(&tailcfg.Node{
ID: 2,
StableID: "test",
Name: "test",
DERP: "127.3.3.40:1",
AllowedIPs: []netip.Prefix{
netip.MustParsePrefix("0.0.0.0/0"), netip.MustParsePrefix("::/0"),
},
CapMap: (tailcfg.NodeCapMap)(map[tailcfg.NodeCapability][]tailcfg.RawMessage{
tailcfg.NodeAttrSuggestExitNode: {},
}),
}).View(),
(&tailcfg.Node{
ID: 3,
StableID: "foo",
Name: "foo",
DERP: "127.3.3.40:3",
AllowedIPs: []netip.Prefix{
netip.MustParsePrefix("0.0.0.0/0"), netip.MustParsePrefix("::/0"),
},
CapMap: (tailcfg.NodeCapMap)(map[tailcfg.NodeCapability][]tailcfg.RawMessage{
tailcfg.NodeAttrSuggestExitNode: {},
}),
}).View(),
},
},
wantID: "test",
wantName: "test",
wantLastSuggestedExitNode: lastSuggestedExitNode{name: "test", id: "test"},
},
{
name: "unable to use last suggested exit node",
report: netcheck.Report{
RegionLatency: map[int]time.Duration{
1: 10,
2: 10,
3: 5,
},
PreferredDERP: 0,
},
wantErr: ErrCannotSuggestExitNode,
},
}
for _, tt := range tests {
lb := newTestLocalBackend(t)
lb.lastSuggestedExitNode = tt.lastSuggestedExitNode
lb.netMap = &tt.netMap
lb.sys.MagicSock.Get().SetLastNetcheckReport(context.Background(), tt.report)
got, err := lb.SuggestExitNode()
if got.ID != tt.wantID {
t.Errorf("ID=%v, want=%v", got.ID, tt.wantID)
}
if got.Name != tt.wantName {
t.Errorf("Name=%v, want=%v", got.Name, tt.wantName)
}
if lb.lastSuggestedExitNode != tt.wantLastSuggestedExitNode {
t.Errorf("lastSuggestedExitNode=%v, want=%v", lb.lastSuggestedExitNode, tt.wantLastSuggestedExitNode)
}
if err != tt.wantErr {
t.Errorf("Error=%v, want=%v", err, tt.wantErr)
}
}
}
func TestEnableAutoUpdates(t *testing.T) {
lb := newTestLocalBackend(t)

6
wgengine/magicsock/magicsock.go
Unescape Escape View File

@ -3088,3 +3088,9 @@ func (c *Conn) GetLastNetcheckReport(ctx context.Context) *netcheck.Report {
}
return lastReport
}
// SetLastNetcheckReport sets local backend's last netcheck report.
// Used for testing purposes.
func (c *Conn) SetLastNetcheckReport(ctx context.Context, report netcheck.Report) {
c.lastNetCheckReport.Store(&report)
}

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