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