1 /* SPDX-License-Identifier: LGPL-2.1-only */
2
3 #include "nl-default.h"
4
5 #include <linux/netlink.h>
6
7 #include <netlink/netlink.h>
8 #include <netlink/route/link.h>
9 #include <netlink/route/link/bridge.h>
10
11 #define TEST_BRIDGE_NAME "testbridge"
12 #define TEST_INTERFACE_NAME "testtap1"
13
create_bridge(struct nl_sock * sk,struct nl_cache * link_cache,const char * name)14 static int create_bridge(struct nl_sock *sk, struct nl_cache *link_cache, const char *name) {
15 struct rtnl_link *link;
16 int err;
17
18 link = rtnl_link_alloc();
19 if ((err = rtnl_link_set_type(link, "bridge")) < 0) {
20 rtnl_link_put(link);
21 return err;
22 }
23 rtnl_link_set_name(link, name);
24
25 if ((err = rtnl_link_add(sk, link, NLM_F_CREATE)) < 0) {
26 return err;
27 }
28 rtnl_link_put(link);
29
30 return 0;
31 }
32
main(int argc,char * argv[])33 int main(int argc, char *argv[])
34 {
35 struct rtnl_link *link;
36 struct nl_cache *link_cache;
37 struct nl_sock *sk;
38 struct rtnl_link *ltap;
39 int err;
40
41 sk = nl_socket_alloc();
42 if ((err = nl_connect(sk, NETLINK_ROUTE)) < 0) {
43 nl_perror(err, "Unable to connect socket");
44 return err;
45 }
46
47 if ((err = rtnl_link_alloc_cache(sk, AF_UNSPEC, &link_cache)) < 0) {
48 nl_perror(err, "Unable to allocate cache");
49 return err;
50 }
51
52 if ((err = create_bridge(sk, link_cache, TEST_BRIDGE_NAME)) < 0) {
53 nl_perror(err, "Unable to allocate testbridge");
54 return err;
55 }
56
57 nl_cache_refill(sk, link_cache);
58
59 link = rtnl_link_get_by_name(link_cache, TEST_BRIDGE_NAME);
60 ltap = rtnl_link_get_by_name(link_cache, TEST_INTERFACE_NAME);
61 if (!ltap) {
62 fprintf(stderr, "You should create a tap interface before lunch this test (# tunctl -t %s)\n", TEST_INTERFACE_NAME);
63 return -1;
64 }
65
66 if ((err = rtnl_link_enslave(sk, link, ltap)) < 0) {
67 nl_perror(err, "Unable to enslave interface to his bridge\n");
68 return err;
69 }
70
71 if(rtnl_link_is_bridge(link) == 0) {
72 fprintf(stderr, "Link is not a bridge\n");
73 return -2;
74 }
75
76 rtnl_link_put(ltap);
77 nl_cache_refill(sk, link_cache);
78 ltap = rtnl_link_get_by_name(link_cache, TEST_INTERFACE_NAME);
79
80 if(rtnl_link_get_master(ltap) <= 0) {
81 fprintf(stderr, "Interface is not attached to a bridge\n");
82 return -3;
83 }
84
85 rtnl_link_put(ltap);
86 rtnl_link_put(link);
87
88 nl_cache_free(link_cache);
89 nl_socket_free(sk);
90
91 return 0;
92 }
93