From af382403ec5b8752ee98e89c04739b447cb24713 Mon Sep 17 00:00:00 2001
From: evgeny <evgeny@adaptto.ru>
Date: Mon, 14 Sep 2026 23:17:59 +0300
Subject: [PATCH] tun_freebsd: reuse existing TUN interface on SIOCIFCREATE
 EEXIST

---
 src/tun_freebsd.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/tun_freebsd.c b/src/tun_freebsd.c
index 2108820e..c456eb32 100644
--- a/src/tun_freebsd.c
+++ b/src/tun_freebsd.c
@@ -77,9 +77,13 @@ static int create_tun_device(char *ifname, size_t ifname_len) {
         strncpy(ifr.ifr_name, ifname, IFNAMSIZ - 1);
         ifr.ifr_name[IFNAMSIZ - 1] = '\0';
         if (ioctl(sock, SIOCIFCREATE, &ifr) < 0) {
-            DEBUG_ERROR(DEBUG_CATEGORY_TUN, "SIOCIFCREATE failed for %s: %s", ifname, strerror(errno));
-            close(sock);
-            return -1;
+            if (errno == EEXIST) {
+                DEBUG_INFO(DEBUG_CATEGORY_TUN, "TUN interface %s already exists, reusing it", ifname);
+            } else {
+                DEBUG_ERROR(DEBUG_CATEGORY_TUN, "SIOCIFCREATE failed for %s: %s", ifname, strerror(errno));
+                close(sock);
+                return -1;
+            }
         }
         close(sock);