From 09bc8c35c5c4fdef6af33b7399b05edda005a208 Mon Sep 17 00:00:00 2001
From: evgeny <evgeny@adaptto.ru>
Date: Tue, 29 Sep 2026 03:59:30 +0300
Subject: [PATCH] Release TUN proxy connections when lwIP aborts their PCB

---
 src/proxy/tcp_proxy_client.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/src/proxy/tcp_proxy_client.c b/src/proxy/tcp_proxy_client.c
index 5b295635..2c6cb1ec 100644
--- a/src/proxy/tcp_proxy_client.c
+++ b/src/proxy/tcp_proxy_client.c
@@ -452,12 +452,11 @@ static void tcp_proxy_client_err_cb(void *arg, err_t err) {
     DEBUG_ERROR(DEBUG_CATEGORY_PROXY, "TCP proxy client: error %d sid=%08x fin_local=%d rem_closed=%d",
                  err, pc->stream_id, pc->fin_local, pc->rem_closed);
     pc->pcb = NULL; // pcb уже освобождён (или вот-вот) стеком lwip — не разыменовывать
-    if (err == LERR_CLSD) { // graceful close активной стороной — ERROR слать не нужно
-        tcp_proxy_client_conn_free(pc);
-        return;
+    if (err != LERR_CLSD) {
+        pc->error = 1;
+        if (tcp_proxy_client_send_error(pc) < 0) DEBUG_ERROR(DEBUG_CATEGORY_PROXY, "PROXY send_error failed sid=%08x", pc->stream_id);
     }
-    pc->error = 1;
-    if (tcp_proxy_client_send_error(pc) < 0) DEBUG_ERROR(DEBUG_CATEGORY_PROXY, "PROXY send_error failed sid=%08x", pc->stream_id);
+    tcp_proxy_client_conn_free(pc);
 }
 
 static err_t tcp_proxy_client_poll_cb(void *arg, struct tcp_pcb *pcb) {
@@ -476,7 +475,7 @@ static err_t tcp_proxy_client_poll_cb(void *arg, struct tcp_pcb *pcb) {
         pc->pcb = NULL;
     }
         tcp_proxy_client_conn_free(pc);
-        return LERR_OK;
+        return LERR_ABRT;
     }
 
     if (pc->close_pending) {