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https://github.com/espressif/esp-idf.git
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36735f4d77
This commit removes the lock from the list manipulation code in esp_netif_objects.c, because we already have another lock/task context for lwip. So the list manipulation is unsafe and safety must be assured by the stack layer (in esp_netif_lwip). Problems with current locking: * implementation of locking was wrong -- lazy init style of creating the mutex is not thread safe (and destroying it if we have no interface makes the problem exhibit very frequently) * locking only the list won't solve issues when assessing interfaces atomically * maintaining multiple locks is problematic, as we often switch between lwip context and user context in internal implementation of esp_netif_lwip Closes https://github.com/espressif/esp-idf/issues/12261
123 lines
3.1 KiB
C
123 lines
3.1 KiB
C
/*
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* SPDX-FileCopyrightText: 2015-2023 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include "esp_netif.h"
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#include "sys/queue.h"
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#include "esp_log.h"
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#include "esp_netif_private.h"
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#include <string.h>
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//
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// Purpose of this module is to provide list of esp-netif structures
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// - this module has no dependency on a specific network stack (lwip)
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//
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static const char *TAG = "esp_netif_objects";
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typedef struct slist_netifs_s slist_netifs_t;
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struct slist_netifs_s {
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esp_netif_t *netif;
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SLIST_ENTRY(slist_netifs_s) next;
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};
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SLIST_HEAD(slisthead, slist_netifs_s) s_head = { .slh_first = NULL, };
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static size_t s_esp_netif_counter = 0;
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ESP_EVENT_DEFINE_BASE(IP_EVENT);
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//
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// List manipulation functions
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//
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esp_err_t esp_netif_add_to_list_unsafe(esp_netif_t *netif)
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{
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struct slist_netifs_s *item = calloc(1, sizeof(struct slist_netifs_s));
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ESP_LOGV(TAG, "%s %p", __func__, netif);
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if (item == NULL) {
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return ESP_ERR_NO_MEM;
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}
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item->netif = netif;
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SLIST_INSERT_HEAD(&s_head, item, next);
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++s_esp_netif_counter;
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ESP_LOGD(TAG, "%s netif added successfully (total netifs: %" PRIu32 ")", __func__, (uint32_t)s_esp_netif_counter);
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return ESP_OK;
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}
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esp_err_t esp_netif_remove_from_list_unsafe(esp_netif_t *netif)
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{
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struct slist_netifs_s *item;
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ESP_LOGV(TAG, "%s %p", __func__, netif);
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SLIST_FOREACH(item, &s_head, next) {
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if (item->netif == netif) {
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SLIST_REMOVE(&s_head, item, slist_netifs_s, next);
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assert(s_esp_netif_counter > 0);
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--s_esp_netif_counter;
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ESP_LOGD(TAG, "%s netif successfully removed (total netifs: %" PRIu32 ")", __func__, (uint32_t)s_esp_netif_counter);
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free(item);
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return ESP_OK;
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}
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}
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return ESP_ERR_NOT_FOUND;
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}
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size_t esp_netif_get_nr_of_ifs(void)
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{
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return s_esp_netif_counter;
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}
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// This API is inherently unsafe
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// suggest that users call from esp_netif_tcpip_exec()
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esp_netif_t* esp_netif_next(esp_netif_t* netif)
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{
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return esp_netif_next_unsafe(netif);
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}
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esp_netif_t* esp_netif_next_unsafe(esp_netif_t* netif)
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{
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ESP_LOGV(TAG, "%s %p", __func__, netif);
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struct slist_netifs_s *item;
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// Getting the first netif if argument is NULL
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if (netif == NULL) {
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item = SLIST_FIRST(&s_head);
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return (item == NULL) ? NULL : item->netif;
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}
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// otherwise the next one (after the supplied netif)
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SLIST_FOREACH(item, &s_head, next) {
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if (item->netif == netif) {
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item = SLIST_NEXT(item, next);
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return (item == NULL) ? NULL : item->netif;
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}
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}
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return NULL;
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}
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bool esp_netif_is_netif_listed(esp_netif_t *esp_netif)
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{
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struct slist_netifs_s *item;
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SLIST_FOREACH(item, &s_head, next) {
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if (item->netif == esp_netif) {
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return true;
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}
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}
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return false;
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}
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esp_netif_t *esp_netif_get_handle_from_ifkey_unsafe(const char *if_key)
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{
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struct slist_netifs_s *item;
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SLIST_FOREACH(item, &s_head, next) {
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esp_netif_t *esp_netif = item->netif;
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if (strcmp(if_key, esp_netif_get_ifkey(esp_netif)) == 0) {
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return esp_netif;
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}
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}
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return NULL;
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}
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