1 // SPDX-License-Identifier: GPL-2.0
12 #include <linux/if_tun.h>
13 #include <linux/netlink.h>
14 #include <linux/rtnetlink.h>
15 #include <sys/ioctl.h>
16 #include <sys/socket.h>
18 #include "../kselftest_harness.h"
20 static int tun_attach(int fd, char *dev)
24 memset(&ifr, 0, sizeof(ifr));
25 strcpy(ifr.ifr_name, dev);
26 ifr.ifr_flags = IFF_ATTACH_QUEUE;
28 return ioctl(fd, TUNSETQUEUE, (void *) &ifr);
31 static int tun_detach(int fd, char *dev)
35 memset(&ifr, 0, sizeof(ifr));
36 strcpy(ifr.ifr_name, dev);
37 ifr.ifr_flags = IFF_DETACH_QUEUE;
39 return ioctl(fd, TUNSETQUEUE, (void *) &ifr);
42 static int tun_alloc(char *dev)
47 fd = open("/dev/net/tun", O_RDWR);
49 fprintf(stderr, "can't open tun: %s\n", strerror(errno));
53 memset(&ifr, 0, sizeof(ifr));
54 strcpy(ifr.ifr_name, dev);
55 ifr.ifr_flags = IFF_TAP | IFF_NAPI | IFF_MULTI_QUEUE;
57 err = ioctl(fd, TUNSETIFF, (void *) &ifr);
59 fprintf(stderr, "can't TUNSETIFF: %s\n", strerror(errno));
63 strcpy(dev, ifr.ifr_name);
67 static int tun_delete(char *dev)
72 unsigned char data[64];
77 rtnl = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
79 fprintf(stderr, "can't open rtnl: %s\n", strerror(errno));
83 memset(&req, 0, sizeof(req));
84 req.nh.nlmsg_len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(req.ifm)));
85 req.nh.nlmsg_flags = NLM_F_REQUEST;
86 req.nh.nlmsg_type = RTM_DELLINK;
88 req.ifm.ifi_family = AF_UNSPEC;
90 rta = (struct rtattr *)(((char *)&req) + NLMSG_ALIGN(req.nh.nlmsg_len));
91 rta->rta_type = IFLA_IFNAME;
92 rta->rta_len = RTA_LENGTH(IFNAMSIZ);
93 req.nh.nlmsg_len += rta->rta_len;
94 memcpy(RTA_DATA(rta), dev, IFNAMSIZ);
96 ret = send(rtnl, &req, req.nh.nlmsg_len, 0);
98 fprintf(stderr, "can't send: %s\n", strerror(errno));
99 ret = (unsigned int)ret != req.nh.nlmsg_len;
107 char ifname[IFNAMSIZ];
113 memset(self->ifname, 0, sizeof(self->ifname));
115 self->fd = tun_alloc(self->ifname);
116 ASSERT_GE(self->fd, 0);
118 self->fd2 = tun_alloc(self->ifname);
119 ASSERT_GE(self->fd2, 0);
122 FIXTURE_TEARDOWN(tun)
130 TEST_F(tun, delete_detach_close) {
131 EXPECT_EQ(tun_delete(self->ifname), 0);
132 EXPECT_EQ(tun_detach(self->fd, self->ifname), -1);
133 EXPECT_EQ(errno, 22);
136 TEST_F(tun, detach_delete_close) {
137 EXPECT_EQ(tun_detach(self->fd, self->ifname), 0);
138 EXPECT_EQ(tun_delete(self->ifname), 0);
141 TEST_F(tun, detach_close_delete) {
142 EXPECT_EQ(tun_detach(self->fd, self->ifname), 0);
145 EXPECT_EQ(tun_delete(self->ifname), 0);
148 TEST_F(tun, reattach_delete_close) {
149 EXPECT_EQ(tun_detach(self->fd, self->ifname), 0);
150 EXPECT_EQ(tun_attach(self->fd, self->ifname), 0);
151 EXPECT_EQ(tun_delete(self->ifname), 0);
154 TEST_F(tun, reattach_close_delete) {
155 EXPECT_EQ(tun_detach(self->fd, self->ifname), 0);
156 EXPECT_EQ(tun_attach(self->fd, self->ifname), 0);
159 EXPECT_EQ(tun_delete(self->ifname), 0);