tun_freebsd: reuse existing TUN interface on SIOCIFCREATE EEXIST

src/tun_freebsd.c

@@ -77,10 +77,14 @@ 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) {
+            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);
 
         char dev_path[IFNAMSIZ + 6];