mirror of
https://github.com/espressif/esp-idf.git
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b2af4d9689
linux/lwip: Wrap some IO posix functions * to workaourd the FreeRTOS EINTR issue (when building without lwip) * to correctly choose the sub-system based on fd (when building with lwip) -- passing control to either linux/system or to lwip This commit also addapts tapio-if to provide DHCP client by default and configurable settings for static IP
135 lines
3.7 KiB
C
135 lines
3.7 KiB
C
/*
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* SPDX-FileCopyrightText: 2022-2023 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 <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include "esp_err.h"
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#include "esp_log.h"
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#include "esp_netif.h"
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// Use linux system sockets to connect to tap interface
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#define LWIP_HDR_LINUX_SYS_SOCKETS_H
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#include <sys/socket.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <lwip/sys.h>
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#include "errno.h"
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#include <linux/if.h>
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#include <linux/if_tun.h>
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#define DEVTAP "/dev/net/tun"
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#define DEVTAP_NAME "tap0"
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typedef struct tap_io {
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esp_netif_driver_base_t base;
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int fd;
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} tap_io_t;
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static const char *TAG = "tap-netif";
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static void tapio_input_task(void *arg)
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{
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tap_io_t *io = arg;
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fd_set fdset;
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int ret;
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while (1) {
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FD_ZERO(&fdset);
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FD_SET(io->fd, &fdset);
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/* Wait for a packet to arrive. */
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ret = select(io->fd + 1, &fdset, NULL, NULL, NULL);
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if (ret == 1) {
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/* Handle incoming packet. */
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ssize_t readlen;
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char buf[1518]; /* max packet size including VLAN excluding CRC */
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/* Obtain the size of the packet and put it into the "len"
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variable. */
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readlen = read(io->fd, buf, sizeof(buf));
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if (readlen < 0) {
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ESP_LOGE(TAG, "Failed to read from tap fd: returned %ld", readlen);
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exit(1);
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}
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#if CONFIG_EXAMPLE_CONNECT_TAPIF_IN_LOSS
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if (((double)rand()/(double)RAND_MAX) < ((double)CONFIG_EXAMPLE_CONNECT_TAPIF_IN_LOSS)/100.0) {
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ESP_LOGW(TAG, "Simulated packet drop on input");
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continue;
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}
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#endif
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esp_netif_receive(io->base.netif, buf, readlen, NULL);
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} else if (ret == -1) {
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if (errno == EINTR /* Interrupted system call (used by FreeRTOS simulated interrupts) */) {
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vTaskDelay(1); // yield to the FreeRTOS simulator
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} else {
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ESP_LOGE(TAG, "tapif_thread: select() error(%d), %s", errno, strerror(errno));
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}
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}
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}
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}
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static esp_err_t tapio_start(esp_netif_t *esp_netif, void *arg)
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{
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tap_io_t *io = arg;
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io->base.netif = esp_netif;
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esp_netif_action_start(esp_netif, 0, 0, 0);
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sys_thread_new("tapio_rx", tapio_input_task, io, DEFAULT_THREAD_STACKSIZE, DEFAULT_THREAD_PRIO);
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return ESP_OK;
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}
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void *tapio_create(void)
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{
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static tap_io_t tap_io = {};
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tap_io.base.post_attach = tapio_start;
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tap_io.fd = open(DEVTAP, O_RDWR);
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if (tap_io.fd == -1) {
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ESP_LOGE(TAG, "Cannot open tap device %s", DEVTAP);
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return NULL;
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}
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struct ifreq ifr = {};
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memset(&ifr, 0, sizeof(ifr));
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strncpy(ifr.ifr_name, DEVTAP_NAME, sizeof(ifr.ifr_name));
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ifr.ifr_name[sizeof(ifr.ifr_name)-1] = 0; /* ensure \0 termination */
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ifr.ifr_flags = IFF_TAP|IFF_NO_PI;
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if (ioctl(tap_io.fd, TUNSETIFF, (void *) &ifr) < 0) {
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ESP_LOGE(TAG, "Cannot configure ioctl(TUNSETIFF) for \"%s\"", DEVTAP);
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return NULL;
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}
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return &tap_io;
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}
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esp_err_t tapio_output(void *h, void *buffer, size_t len)
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{
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tap_io_t *io = h;
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ssize_t written;
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#if CONFIG_EXAMPLE_CONNECT_TAPIF_OUT_LOSS
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if (((double)rand()/(double)RAND_MAX) < ((double)CONFIG_EXAMPLE_CONNECT_TAPIF_OUT_LOSS)/100.0) {
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ESP_LOGW(TAG, "Simulated packet drop on output");
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return ESP_OK; /* ESP_OK because we simulate packet loss on cable */
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}
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#endif
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/* signal that packet should be sent(); */
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written = write(io->fd, buffer, len);
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if (written < len) {
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ESP_LOGE(TAG, "Failed to write from tap fd: returned %ld", written);
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return ESP_FAIL;
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}
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return ESP_OK;
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}
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