Add Linux TAP

2026-09-03 20:18:59 +03:00
parent 948ae56f77
commit 9fce687690
29 changed files with 815 additions and 118 deletions
@@ -0,0 +1,86 @@
+/*
+ * SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#include "esp_err.h"
+#include "esp_netif.h"      // esp-netif
+#include "tapio.h"          // esp-netif's driver side
+#include "lwip/tapif.h"     // esp-netif's network stack side
+#include "esp_log.h"
+
+#if CONFIG_EXAMPLE_CONNECT_WAIT_FOR_IP
+#include "esp_event.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "freertos/event_groups.h"
+
+static const char *TAG = "linux_connect";
+
+static EventGroupHandle_t s_events;
+
+static void event_handler(void* arg, esp_event_base_t event_base, int32_t event_id, void* event_data)
+{
+    xEventGroupSetBits(s_events, 1);
+}
+
+#endif // CONFIG_EXAMPLE_CONNECT_WAIT_FOR_IP
+
+#define TAP0_GOT_IP (0x1234)
+
+esp_err_t example_connect(void)
+{
+#if CONFIG_EXAMPLE_CONNECT_LWIP_TAPIF
+    // configure linux tapio
+    esp_netif_driver_ifconfig_t driver_cfg = {
+            .handle = tapio_create(),
+            .transmit = tapio_output,
+    };
+    // configure lwip netif for the tapif
+    struct esp_netif_netstack_config stack_cfg = {
+            .lwip = {
+                    .init_fn = lwip_tapif_init,
+                    .input_fn = lwip_tapif_input,
+            }
+    };
+    // configure inherent esp-netif parameters
+    esp_netif_ip_info_t ip_info = {};
+    esp_netif_flags_t netif_flags = (ESP_NETIF_FLAG_EVENT_IP_MODIFIED | ESP_NETIF_FLAG_AUTOUP);
+#if !CONFIG_EXAMPLE_CONNECT_WAIT_FOR_IP
+    ip_info.ip.addr = ipaddr_addr(CONFIG_EXAMPLE_CONNECT_TAPIF_IP_ADDR);
+    ip_info.netmask.addr = ipaddr_addr(CONFIG_EXAMPLE_CONNECT_TAPIF_NETMASK);
+    ip_info.gw.addr = ipaddr_addr(CONFIG_EXAMPLE_CONNECT_TAPIF_GW);
+#else
+    netif_flags |= ESP_NETIF_DHCP_CLIENT;
+#endif
+
+    esp_netif_inherent_config_t base_cfg = {
+            .if_key = "TAP",
+            .ip_info = &ip_info,
+            .flags = netif_flags,
+            .get_ip_event = TAP0_GOT_IP,
+            .route_prio = 100
+    };
+
+    // put all configs together
+    esp_netif_config_t cfg = {
+            .base = &base_cfg,
+            .driver = &driver_cfg,
+            .stack = &stack_cfg
+    };
+
+    // create the interface and attach it to the tapio-handle
+    esp_netif_t *tap_netif = esp_netif_new(&cfg);
+    esp_netif_attach(tap_netif, driver_cfg.handle);
+#if CONFIG_EXAMPLE_CONNECT_WAIT_FOR_IP
+    ESP_LOGI(TAG, "Waiting for IP addresses...");
+    esp_netif_action_connected(tap_netif, 0, 0, 0);
+    ESP_ERROR_CHECK(esp_event_handler_register(IP_EVENT, TAP0_GOT_IP, event_handler, NULL));
+    s_events = xEventGroupCreate();
+    xEventGroupWaitBits(s_events, 1, pdFALSE, pdFALSE, portMAX_DELAY);
+    esp_netif_get_ip_info(tap_netif, &ip_info);
+    ESP_LOGI(TAG, "Assigned IP address:"IPSTR ",", IP2STR(&ip_info.ip));
+#endif // CONFIG_EXAMPLE_CONNECT_WAIT_FOR_IP
+#endif // EXAMPLE_CONNECT_LWIP_TAPIF
+    return ESP_OK;
+}