1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2008
4 * Copyright (c) Linux Test Project, 2017-2019
5 * Author: Rusty Russell <[email protected]>
6 * Ported to LTP: subrata <[email protected]>
7 * Test ioriginally written for kernel 2.6.27.
8 */
9
10 /*\
11 * [Description]
12 *
13 * Test whether all the valid IFF flags are returned properly by implementation
14 * of TUNGETFEATURES ioctl.
15 */
16
17 #include <sys/types.h>
18 #include <sys/ioctl.h>
19 #include <sys/stat.h>
20 #include <fcntl.h>
21 #include <errno.h>
22 #include <linux/if_tun.h>
23 #include "tst_test.h"
24
25 #ifndef TUNGETFEATURES
26 #define TUNGETFEATURES _IOR('T', 207, unsigned int)
27 #endif
28
29 #ifndef IFF_VNET_HDR
30 #define IFF_VNET_HDR 0x4000
31 #endif
32
33 #ifndef IFF_MULTI_QUEUE
34 #define IFF_MULTI_QUEUE 0x0100
35 #endif
36
37 #ifndef IFF_NAPI
38 #define IFF_NAPI 0x0010
39 #endif
40
41 #ifndef IFF_NAPI_FRAGS
42 #define IFF_NAPI_FRAGS 0x0020
43 #endif
44
45 #ifndef IFF_NO_CARRIER
46 #define IFF_NO_CARRIER 0x0040
47 #endif
48
49 static struct {
50 unsigned int flag;
51 const char *name;
52 } known_flags[] = {
53 {IFF_TUN, "TUN"},
54 {IFF_TAP, "TAP"},
55 {IFF_NO_PI, "NO_PI"},
56 {IFF_ONE_QUEUE, "ONE_QUEUE"},
57 {IFF_VNET_HDR, "VNET_HDR"},
58 {IFF_MULTI_QUEUE, "MULTI_QUEUE"},
59 {IFF_NAPI, "IFF_NAPI"},
60 {IFF_NAPI_FRAGS, "IFF_NAPI_FRAGS"},
61 {IFF_NO_CARRIER, "IFF_NO_CARRIER"}
62 };
63
verify_features(void)64 static void verify_features(void)
65 {
66 unsigned int features, i;
67
68 int netfd = open("/dev/net/tun", O_RDWR);
69
70 /* Android has tun at /dev/tun */
71 if (netfd == -1 && (errno == ENODEV || errno == ENOENT))
72 netfd = open("/dev/tun", O_RDWR);
73
74 if (netfd == -1) {
75 if (errno == ENODEV || errno == ENOENT)
76 tst_brk(TCONF, "TUN support is missing?");
77
78 tst_brk(TBROK | TERRNO, "opening /dev/net/tun failed");
79 }
80
81 SAFE_IOCTL(netfd, TUNGETFEATURES, &features);
82
83 tst_res(TINFO, "Available features are: %#x", features);
84 for (i = 0; i < ARRAY_SIZE(known_flags); i++) {
85 if (features & known_flags[i].flag) {
86 features &= ~known_flags[i].flag;
87 tst_res(TPASS, "%s %#x", known_flags[i].name,
88 known_flags[i].flag);
89 }
90 }
91 if (features)
92 tst_res(TFAIL, "(UNKNOWN %#x)", features);
93
94 SAFE_CLOSE(netfd);
95 }
96
97 static struct tst_test test = {
98 .test_all = verify_features,
99 .needs_root = 1,
100 };
101