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fix(tunnel): resolve UDP stream interruption and add KCP protocol support

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- Increase UDP listener default TTL from 5s to 30s to prevent idle disconnect
- Add mux keepalive config (15s interval, 45s timeout) to tunnel relay handler
- Add KCP as tunnel chain transport protocol with keepalive and UDP mode default
- Add KCP protocol option to tunnel UI (frontend)
- Remove generic 'tcp' fallback key from KCP metadata to prevent false TCP mode
- Simplify forward service config by removing unused tunnelTLSProtocol parameter
This commit is contained in:
sagitchu
2026-04-20 23:57:43 +08:00
parent 7f14bd30fa
commit 630e012ec1
11 changed files with 195 additions and 55 deletions
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go-backend/internal/http/handler/control_plane.go
+8 -20
View File
@@ -185,14 +185,6 @@ func (h *Handler) listForwardPorts(forwardID int64) ([]forwardPortRecord, error)
return h.repo.ListForwardPorts(forwardID)
}
func (h *Handler) isTunnelSelectedTLSProtocol(tunnelID int64) (bool, error) {
protocol, err := h.repo.GetTunnelOutProtocol(tunnelID)
if err != nil {
return false, err
}
return isTLSTunnelProtocol(protocol), nil
}
func (h *Handler) getNodeRecord(nodeID int64) (*nodeRecord, error) {
n, err := h.repo.GetNodeRecord(nodeID)
if err != nil {
@@ -272,10 +264,6 @@ func (h *Handler) syncForwardServicesWithWarnings(forward *forwardRecord, method
}
serviceBase := buildForwardServiceBaseWithResolvedUserTunnel(forward.ID, forward.UserID, userTunnelID)
tunnelTLSProtocol, err := h.isTunnelSelectedTLSProtocol(forward.TunnelID)
if err != nil {
return nil, err
}
for _, fp := range ports {
if limiterID != nil && speed != nil {
@@ -298,7 +286,7 @@ func (h *Handler) syncForwardServicesWithWarnings(forward *forwardRecord, method
if err != nil {
return nil, err
}
services := buildForwardServiceConfigs(serviceBase, forward, tunnel, node, fp.Port, strings.TrimSpace(fp.InIP), limiterID, tunnelTLSProtocol)
services := buildForwardServiceConfigs(serviceBase, forward, tunnel, node, fp.Port, strings.TrimSpace(fp.InIP), limiterID)
_, err = h.sendNodeCommand(node.ID, method, services, true, false)
if err != nil && allowFallbackAdd && method == "UpdateService" {
if isNotFoundError(err) {
@@ -313,7 +301,7 @@ func (h *Handler) syncForwardServicesWithWarnings(forward *forwardRecord, method
}
if err != nil && strings.EqualFold(strings.TrimSpace(method), "UpdateService") && isCannotAssignRequestedAddressError(err) {
var warning string
warning, err = h.fallbackForwardPortToDefaultBind(forward, tunnel, node, fp, serviceBase, limiterID, tunnelTLSProtocol)
warning, err = h.fallbackForwardPortToDefaultBind(forward, tunnel, node, fp, serviceBase, limiterID)
if err == nil && warning != "" {
warnings = append(warnings, warning)
}
@@ -339,7 +327,7 @@ func (h *Handler) syncForwardServicesWithWarnings(forward *forwardRecord, method
return warnings, nil
}
func (h *Handler) fallbackForwardPortToDefaultBind(forward *forwardRecord, tunnel *tunnelRecord, node *nodeRecord, fp forwardPortRecord, serviceBase string, limiterID *int64, tunnelTLSProtocol bool) (string, error) {
func (h *Handler) fallbackForwardPortToDefaultBind(forward *forwardRecord, tunnel *tunnelRecord, node *nodeRecord, fp forwardPortRecord, serviceBase string, limiterID *int64) (string, error) {
if h == nil || forward == nil || tunnel == nil || node == nil {
return "", errors.New("invalid bind fallback context")
}
@@ -356,7 +344,7 @@ func (h *Handler) fallbackForwardPortToDefaultBind(forward *forwardRecord, tunne
}
time.Sleep(150 * time.Millisecond)
defaultServices := buildForwardServiceConfigs(serviceBase, forward, tunnel, node, fp.Port, "", limiterID, tunnelTLSProtocol)
defaultServices := buildForwardServiceConfigs(serviceBase, forward, tunnel, node, fp.Port, "", limiterID)
if _, err := h.sendNodeCommand(node.ID, "AddService", defaultServices, true, false); err != nil {
return "", err
}
@@ -1561,7 +1549,7 @@ func compactErrorMessage(msg string) string {
return strings.Join(strings.Fields(strings.ToLower(msg)), "")
}
func buildForwardServiceConfigs(baseName string, forward *forwardRecord, tunnel *tunnelRecord, node *nodeRecord, port int, bindIP string, limiterID *int64, tunnelTLSProtocol bool) []map[string]interface{} {
func buildForwardServiceConfigs(baseName string, forward *forwardRecord, tunnel *tunnelRecord, node *nodeRecord, port int, bindIP string, limiterID *int64) []map[string]interface{} {
protocols := []string{"tcp", "udp"}
services := make([]map[string]interface{}, 0, 2)
targets := splitRemoteTargets(forward.RemoteAddr)
@@ -1605,9 +1593,9 @@ func buildForwardServiceConfigs(baseName string, forward *forwardRecord, tunnel
},
}
if protocol == "udp" {
listenerMetadata := map[string]interface{}{"keepAlive": true}
if tunnelTLSProtocol {
listenerMetadata["ttl"] = "10s"
listenerMetadata := map[string]interface{}{
"keepAlive": true,
"ttl": "30s",
}
service["listener"].(map[string]interface{})["metadata"] = listenerMetadata
}