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// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <linux/if.h>
#include <linux/if_tun.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include "../kselftest_harness.h"
static int tun_attach(int fd, char *dev)
{
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
strcpy(ifr.ifr_name, dev);
ifr.ifr_flags = IFF_ATTACH_QUEUE;
return ioctl(fd, TUNSETQUEUE, (void *) &ifr);
}
static int tun_detach(int fd, char *dev)
{
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
strcpy(ifr.ifr_name, dev);
ifr.ifr_flags = IFF_DETACH_QUEUE;
return ioctl(fd, TUNSETQUEUE, (void *) &ifr);
}
static int tun_alloc(char *dev)
{
struct ifreq ifr;
int fd, err;
fd = open("/dev/net/tun", O_RDWR);
if (fd < 0) {
fprintf(stderr, "can't open tun: %s\n", strerror(errno));
return fd;
}
memset(&ifr, 0, sizeof(ifr));
strcpy(ifr.ifr_name, dev);
ifr.ifr_flags = IFF_TAP | IFF_NAPI | IFF_MULTI_QUEUE;
err = ioctl(fd, TUNSETIFF, (void *) &ifr);
if (err < 0) {
fprintf(stderr, "can't TUNSETIFF: %s\n", strerror(errno));
close(fd);
return err;
}
strcpy(dev, ifr.ifr_name);
return fd;
}
static int tun_delete(char *dev)
{
struct {
struct nlmsghdr nh;
struct ifinfomsg ifm;
unsigned char data[64];
} req;
struct rtattr *rta;
int ret, rtnl;
rtnl = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
if (rtnl < 0) {
fprintf(stderr, "can't open rtnl: %s\n", strerror(errno));
return 1;
}
memset(&req, 0, sizeof(req));
req.nh.nlmsg_len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(req.ifm)));
req.nh.nlmsg_flags = NLM_F_REQUEST;
req.nh.nlmsg_type = RTM_DELLINK;
req.ifm.ifi_family = AF_UNSPEC;
rta = (struct rtattr *)(((char *)&req) + NLMSG_ALIGN(req.nh.nlmsg_len));
rta->rta_type = IFLA_IFNAME;
rta->rta_len = RTA_LENGTH(IFNAMSIZ);
req.nh.nlmsg_len += rta->rta_len;
memcpy(RTA_DATA(rta), dev, IFNAMSIZ);
ret = send(rtnl, &req, req.nh.nlmsg_len, 0);
if (ret < 0)
fprintf(stderr, "can't send: %s\n", strerror(errno));
ret = (unsigned int)ret != req.nh.nlmsg_len;
close(rtnl);
return ret;
}
FIXTURE(tun)
{
char ifname[IFNAMSIZ];
int fd, fd2;
};
FIXTURE_SETUP(tun)
{
memset(self->ifname, 0, sizeof(self->ifname));
self->fd = tun_alloc(self->ifname);
ASSERT_GE(self->fd, 0);
self->fd2 = tun_alloc(self->ifname);
ASSERT_GE(self->fd2, 0);
}
FIXTURE_TEARDOWN(tun)
{
if (self->fd >= 0)
close(self->fd);
if (self->fd2 >= 0)
close(self->fd2);
}
TEST_F(tun, delete_detach_close) {
EXPECT_EQ(tun_delete(self->ifname), 0);
EXPECT_EQ(tun_detach(self->fd, self->ifname), -1);
EXPECT_EQ(errno, 22);
}
TEST_F(tun, detach_delete_close) {
EXPECT_EQ(tun_detach(self->fd, self->ifname), 0);
EXPECT_EQ(tun_delete(self->ifname), 0);
}
TEST_F(tun, detach_close_delete) {
EXPECT_EQ(tun_detach(self->fd, self->ifname), 0);
close(self->fd);
self->fd = -1;
EXPECT_EQ(tun_delete(self->ifname), 0);
}
TEST_F(tun, reattach_delete_close) {
EXPECT_EQ(tun_detach(self->fd, self->ifname), 0);
EXPECT_EQ(tun_attach(self->fd, self->ifname), 0);
EXPECT_EQ(tun_delete(self->ifname), 0);
}
TEST_F(tun, reattach_close_delete) {
EXPECT_EQ(tun_detach(self->fd, self->ifname), 0);
EXPECT_EQ(tun_attach(self->fd, self->ifname), 0);
close(self->fd);
self->fd = -1;
EXPECT_EQ(tun_delete(self->ifname), 0);
}
TEST_HARNESS_MAIN
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