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#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/if_tun.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include "tun.h"
int tun_alloc(const char *dev_name, int threads, int *fds) {
struct ifreq ifr;
int fd, i;
if (!dev_name) {
errno = EINVAL;
return -1;
}
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
if (threads > 1)
ifr.ifr_flags |= IFF_MULTI_QUEUE;
strncpy(ifr.ifr_name, dev_name, IFNAMSIZ);
for (i = 0; i < threads; i++) {
if ((fd = open("/dev/net/tun", O_RDWR)) < 0)
goto err;
if (ioctl(fd, TUNSETIFF, (void *)&ifr) != 0) {
close(fd);
goto err;
}
fds[i] = fd;
}
return threads;
err:
for (--i; i >= 0; i--)
close(fds[i]);
return -1;
}
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