DPDK  22.11.0
examples/ip_pipeline/tap.c
/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2018 Intel Corporation
*/
#include <netinet/in.h>
#ifdef RTE_EXEC_ENV_LINUX
#include <linux/if.h>
#include <linux/if_tun.h>
#endif
#include <sys/ioctl.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <rte_string_fns.h>
#include "tap.h"
#define TAP_DEV "/dev/net/tun"
static struct tap_list tap_list;
int
tap_init(void)
{
TAILQ_INIT(&tap_list);
return 0;
}
struct tap *
tap_find(const char *name)
{
struct tap *tap;
if (name == NULL)
return NULL;
TAILQ_FOREACH(tap, &tap_list, node)
if (strcmp(tap->name, name) == 0)
return tap;
return NULL;
}
#ifndef RTE_EXEC_ENV_LINUX
struct tap *
tap_create(const char *name __rte_unused)
{
return NULL;
}
#else
struct tap *
tap_create(const char *name)
{
struct tap *tap;
struct ifreq ifr;
int fd, status;
/* Check input params */
if ((name == NULL) ||
tap_find(name))
return NULL;
/* Resource create */
fd = open(TAP_DEV, O_RDWR | O_NONBLOCK);
if (fd < 0)
return NULL;
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TAP | IFF_NO_PI; /* No packet information */
strlcpy(ifr.ifr_name, name, IFNAMSIZ);
status = ioctl(fd, TUNSETIFF, (void *) &ifr);
if (status < 0) {
close(fd);
return NULL;
}
/* Node allocation */
tap = calloc(1, sizeof(struct tap));
if (tap == NULL) {
close(fd);
return NULL;
}
/* Node fill in */
strlcpy(tap->name, name, sizeof(tap->name));
tap->fd = fd;
/* Node add to list */
TAILQ_INSERT_TAIL(&tap_list, tap, node);
return tap;
}
#endif