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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2024 Angus Gratton
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "lwip/memp.h"
// This is a link-time patch to enforce the limit of max active TCP PCBs. A
// workaround for upstream issue https://github.com/espressif/esp-idf/issues/9670
//
// Without this limit the number of TCP PCBs in TIME-WAIT is unbounded, which can
// have two problems on systems with a lot of short-lived TCP connections:
//
// - Higher memory usage.
// - Increased chance of stalled TCP connections due to port reuse.
static unsigned active_tcp_pcbs;
void *__real_memp_malloc(memp_t type);
void __real_memp_free(memp_t type, void *mem);
void *__wrap_memp_malloc(memp_t type) {
if (type != MEMP_TCP_PCB) {
return __real_memp_malloc(type);
}
if (active_tcp_pcbs >= MEMP_NUM_TCP_PCB) {
return NULL;
}
void *res = __real_memp_malloc(MEMP_TCP_PCB);
if (res != NULL) {
++active_tcp_pcbs;
}
return res;
}
void __wrap_memp_free(memp_t type, void *mem) {
__real_memp_free(type, mem);
if (type == MEMP_TCP_PCB && mem != NULL) {
assert(active_tcp_pcbs);
--active_tcp_pcbs;
}
}
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