Keep STUN port history owned by the core across configuration reloads

src/transport_layer/stun_nat.c

@@ -744,6 +744,7 @@ static void scan_sources(struct STUN_NAT* mod) {
             p->ports = u_calloc(1, sizeof(*p->ports));
             if (!p->ports) { DEBUG_ERROR(DEBUG_CATEGORY_NAT, "STUN port history allocation failed"); u_free(p); continue; }
             p->ports->key = source.key; p->ports->next = mod->ports; mod->ports = p->ports;
+            mod->inst->stun_port_history = mod->ports;
         }
         p->fd = SOCKET_INVALID;
         p->next = mod->probes;
@@ -790,6 +791,7 @@ int stun_nat_init(struct UTUN_INSTANCE* inst) {
     struct STUN_NAT* mod = u_calloc(1, sizeof(*mod));
     if (!mod) { DEBUG_ERROR(DEBUG_CATEGORY_NAT, "STUN module allocation failed"); return -1; }
     mod->inst = inst;
+    mod->ports = inst->stun_port_history;
     inst->stun_nat = mod;
     DEBUG_INFO(DEBUG_CATEGORY_NAT, "STUN initialized with %d servers; independent test sockets", inst->config->global.stun_server_count);
     scan_timer(mod);
@@ -803,11 +805,19 @@ void stun_nat_destroy(struct UTUN_INSTANCE* inst) {
     inst->stun_nat = NULL;
     if (mod->scan_timer) uasync_cancel_timeout(inst->ua, mod->scan_timer);
     while (mod->probes) { struct stun_probe* next = mod->probes->next; destroy_probe(mod->probes); mod->probes = next; }
-    while (mod->ports) { struct stun_ports* next = mod->ports->next; u_free(mod->ports); mod->ports = next; }
     DEBUG_INFO(DEBUG_CATEGORY_NAT, "STUN destroyed; test sockets/DNS/timers released");
     u_free(mod);
 }
 
+void stun_nat_forget_ports(struct UTUN_INSTANCE* inst) {
+    if (!inst) return;
+    if (inst->stun_nat) { DEBUG_ERROR(DEBUG_CATEGORY_NAT, "STUN port history release requires stopped module"); return; }
+    while (inst->stun_port_history) {
+        struct stun_ports* next = inst->stun_port_history->next;
+        u_free(inst->stun_port_history); inst->stun_port_history = next;
+    }
+}
+
 void stun_nat_recheck(struct UTUN_INSTANCE* inst) {
     if (!inst || !inst->stun_nat) return;
     struct STUN_NAT* mod = inst->stun_nat;

src/transport_layer/stun_nat.h

@@ -55,6 +55,8 @@ struct stun_nat_result {
  * destroy отменяет DNS/таймеры и закрывает только собственные UDP-сокеты. */
 int stun_nat_init(struct UTUN_INSTANCE* inst);
 void stun_nat_destroy(struct UTUN_INSTANCE* inst);
+/* История портов живёт до destroy ядра, переживает reload STUN. Вызывать после destroy. */
+void stun_nat_forget_ports(struct UTUN_INSTANCE* inst);
 /* Явно повторяет измерения на свежих тестовых сокетах после изменения сети. */
 void stun_nat_recheck(struct UTUN_INSTANCE* inst);
 /* Копирует результат для имени исходного сокета; -1 если модуль выключен/имя отсутствует. */

src/utun_instance.h

@@ -142,6 +142,7 @@ struct UTUN_INSTANCE {
     sqlite3* topo_sqlite_db;            // Shared SQLite DB (nodes/channels/peers)
     struct NAT_DETECTION* nat_det;      // NAT detection module
     struct STUN_NAT* stun_nat;          // независимая локальная STUN-диагностика UDP
+    struct stun_ports* stun_port_history; // ранее использованные STUN-порты; переживает reload config
     struct merkle_sync* msync;         // Merkle tree sync module (per-instance)
     
     // Identification