OVMS3-idf/components/esp_netif/esp_netif_objects.c

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// Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "esp_netif.h"
#include "sys/queue.h"
#include "esp_log.h"
#include "freertos/FreeRTOS.h"
#include "freertos/semphr.h"
#include "esp_netif_private.h"
#include <string.h>
//
// Purpose of this module is to provide list of esp-netif structures
// - this module has no dependency on a specific network stack (lwip)
//
static const char *TAG = "esp_netif_objects";
typedef struct slist_netifs_s slist_netifs_t;
struct slist_netifs_s {
esp_netif_t *netif;
SLIST_ENTRY(slist_netifs_s) next;
};
SLIST_HEAD(slisthead, slist_netifs_s) s_head = { .slh_first = NULL, };
static size_t s_esp_netif_counter = 0;
static xSemaphoreHandle s_list_lock = NULL;
ESP_EVENT_DEFINE_BASE(IP_EVENT);
esp_err_t esp_netif_list_lock(void)
{
if (s_list_lock == NULL) {
s_list_lock = xSemaphoreCreateMutex();
if (s_list_lock == NULL) {
return ESP_ERR_NO_MEM;
}
}
xSemaphoreTake(s_list_lock, portMAX_DELAY);
return ESP_OK;
}
void esp_netif_list_unlock(void)
{
assert(s_list_lock);
xSemaphoreGive(s_list_lock);
if (s_esp_netif_counter == 0) {
vQueueDelete(s_list_lock);
s_list_lock = NULL;
}
}
//
// List manipulation functions
//
esp_err_t esp_netif_add_to_list(esp_netif_t *netif)
{
esp_err_t ret;
struct slist_netifs_s *item = calloc(1, sizeof(struct slist_netifs_s));
ESP_LOGD(TAG, "%s %p", __func__, netif);
if (item == NULL) {
return ESP_ERR_NO_MEM;
}
item->netif = netif;
if ((ret = esp_netif_list_lock()) != ESP_OK) {
return ret;
}
SLIST_INSERT_HEAD(&s_head, item, next);
++s_esp_netif_counter;
ESP_LOGD(TAG, "%s netif added successfully (total netifs: %d)", __func__, s_esp_netif_counter);
esp_netif_list_unlock();
return ESP_OK;
}
esp_err_t esp_netif_remove_from_list(esp_netif_t *netif)
{
struct slist_netifs_s *item;
esp_err_t ret;
if ((ret = esp_netif_list_lock()) != ESP_OK) {
return ret;
}
ESP_LOGV(TAG, "%s %p", __func__, netif);
SLIST_FOREACH(item, &s_head, next) {
if (item->netif == netif) {
SLIST_REMOVE(&s_head, item, slist_netifs_s, next);
assert(s_esp_netif_counter > 0);
--s_esp_netif_counter;
ESP_LOGD(TAG, "%s netif successfully removed (total netifs: %d)", __func__, s_esp_netif_counter);
free(item);
esp_netif_list_unlock();
return ESP_OK;
}
}
esp_netif_list_unlock();
return ESP_ERR_NOT_FOUND;
}
size_t esp_netif_get_nr_of_ifs(void)
{
return s_esp_netif_counter;
}
esp_netif_t* esp_netif_next(esp_netif_t* netif)
{
esp_err_t ret;
esp_netif_t* result;
if ((ret = esp_netif_list_lock()) != ESP_OK) {
ESP_LOGE(TAG, "Failed to lock esp-netif list with %d", ret);
return NULL;
}
result = esp_netif_next_unsafe(netif);
esp_netif_list_unlock();
return result;
}
esp_netif_t* esp_netif_next_unsafe(esp_netif_t* netif)
{
ESP_LOGV(TAG, "%s %p", __func__, netif);
struct slist_netifs_s *item;
// Getting the first netif if argument is NULL
if (netif == NULL) {
item = SLIST_FIRST(&s_head);
return (item == NULL) ? NULL : item->netif;
}
// otherwise the next one (after the supplied netif)
SLIST_FOREACH(item, &s_head, next) {
if (item->netif == netif) {
item = SLIST_NEXT(item, next);
return (item == NULL) ? NULL : item->netif;
}
}
return NULL;
}
bool esp_netif_is_netif_listed(esp_netif_t *esp_netif)
{
esp_err_t ret;
if ((ret = esp_netif_list_lock()) != ESP_OK) {
ESP_LOGE(TAG, "Failed to lock esp-netif list with %d", ret);
return NULL;
}
// looking for the netif in the list of registered interfaces
esp_netif_t *it = esp_netif_next_unsafe(NULL);
do {
if (it && it == esp_netif) {
esp_netif_list_unlock();
return true;
}
} while (NULL != (it = esp_netif_next_unsafe(it)));
esp_netif_list_unlock();
return false;
}
esp_netif_t *esp_netif_get_handle_from_ifkey(const char *if_key)
{
esp_err_t ret;
if ((ret = esp_netif_list_lock()) != ESP_OK) {
ESP_LOGE(TAG, "Failed to lock esp-netif list with %d", ret);
return NULL;
}
esp_netif_t *esp_netif = esp_netif_next_unsafe(NULL);
do {
if (esp_netif && strcmp(if_key, esp_netif_get_ifkey(esp_netif))==0) {
esp_netif_list_unlock();
return esp_netif;
}
} while (NULL != (esp_netif = esp_netif_next_unsafe(esp_netif)));
esp_netif_list_unlock();
return NULL;
}