feat(rust-core): add adaptive keepalive telemetry, MTU handling, and per-client rate limiting APIs

ts/smartvpn.interfaces.ts

@@ -64,6 +64,10 @@ export interface IVpnServerConfig {
   keepaliveIntervalSecs?: number;
   /** Enable NAT/masquerade for client traffic */
   enableNat?: boolean;
+  /** Default rate limit for new clients (bytes/sec). Omit for unlimited. */
+  defaultRateLimitBytesPerSec?: number;
+  /** Default burst size for new clients (bytes). Omit for unlimited. */
+  defaultBurstBytes?: number;
 }
 
 export interface IVpnServerOptions {
@@ -99,6 +103,7 @@ export interface IVpnStatistics {
   keepalivesSent: number;
   keepalivesReceived: number;
   uptimeSeconds: number;
+  quality?: IVpnConnectionQuality;
 }
 
 export interface IVpnClientInfo {
@@ -107,6 +112,12 @@ export interface IVpnClientInfo {
   connectedSince: string;
   bytesSent: number;
   bytesReceived: number;
+  packetsDropped: number;
+  bytesDropped: number;
+  lastKeepaliveAt?: string;
+  keepalivesReceived: number;
+  rateLimitBytesPerSec?: number;
+  burstBytes?: number;
 }
 
 export interface IVpnServerStatistics extends IVpnStatistics {
@@ -119,6 +130,53 @@ export interface IVpnKeypair {
   privateKey: string;
 }
 
+// ============================================================================
+// QoS: Connection quality
+// ============================================================================
+
+export type TVpnLinkHealth = 'healthy' | 'degraded' | 'critical';
+
+export interface IVpnConnectionQuality {
+  srttMs: number;
+  jitterMs: number;
+  minRttMs: number;
+  maxRttMs: number;
+  lossRatio: number;
+  consecutiveTimeouts: number;
+  linkHealth: TVpnLinkHealth;
+  currentKeepaliveIntervalSecs: number;
+}
+
+// ============================================================================
+// QoS: MTU info
+// ============================================================================
+
+export interface IVpnMtuInfo {
+  tunMtu: number;
+  effectiveMtu: number;
+  linkMtu: number;
+  overheadBytes: number;
+  oversizedPacketsDropped: number;
+  icmpTooBigSent: number;
+}
+
+// ============================================================================
+// QoS: Client telemetry (server-side per-client)
+// ============================================================================
+
+export interface IVpnClientTelemetry {
+  clientId: string;
+  assignedIp: string;
+  lastKeepaliveAt?: string;
+  keepalivesReceived: number;
+  packetsDropped: number;
+  bytesDropped: number;
+  bytesReceived: number;
+  bytesSent: number;
+  rateLimitBytesPerSec?: number;
+  burstBytes?: number;
+}
+
 // ============================================================================
 // IPC Command maps (used by smartrust RustBridge<TCommands>)
 // ============================================================================
@@ -128,6 +186,8 @@ export type TVpnClientCommands = {
   disconnect: { params: Record<string, never>; result: void };
   getStatus: { params: Record<string, never>; result: IVpnStatus };
   getStatistics: { params: Record<string, never>; result: IVpnStatistics };
+  getConnectionQuality: { params: Record<string, never>; result: IVpnConnectionQuality };
+  getMtuInfo: { params: Record<string, never>; result: IVpnMtuInfo };
 };
 
 export type TVpnServerCommands = {
@@ -138,6 +198,9 @@ export type TVpnServerCommands = {
   listClients: { params: Record<string, never>; result: { clients: IVpnClientInfo[] } };
   disconnectClient: { params: { clientId: string }; result: void };
   generateKeypair: { params: Record<string, never>; result: IVpnKeypair };
+  setClientRateLimit: { params: { clientId: string; rateBytesPerSec: number; burstBytes: number }; result: void };
+  removeClientRateLimit: { params: { clientId: string }; result: void };
+  getClientTelemetry: { params: { clientId: string }; result: IVpnClientTelemetry };
 };
 
 // ============================================================================