1// SPDX-License-Identifier: GPL-2.0
 2#define _GNU_SOURCE
 3#include <sched.h>
 4#include <stdlib.h>
 5#include <sys/types.h>
 6#include <sys/socket.h>
 7
 8#include "test_progs.h"
 9#include "cap_helpers.h"
10#include "bind_perm.skel.h"
11
12static int duration;
13
14static int create_netns(void)
15{
16	if (!ASSERT_OK(unshare(CLONE_NEWNET), "create netns"))
17		return -1;
18
19	return 0;
20}
21
22void try_bind(int family, int port, int expected_errno)
23{
24	struct sockaddr_storage addr = {};
25	struct sockaddr_in6 *sin6;
26	struct sockaddr_in *sin;
27	int fd = -1;
28
29	fd = socket(family, SOCK_STREAM, 0);
30	if (CHECK(fd < 0, "fd", "errno %d", errno))
31		goto close_socket;
32
33	if (family == AF_INET) {
34		sin = (struct sockaddr_in *)&addr;
35		sin->sin_family = family;
36		sin->sin_port = htons(port);
37	} else {
38		sin6 = (struct sockaddr_in6 *)&addr;
39		sin6->sin6_family = family;
40		sin6->sin6_port = htons(port);
41	}
42
43	errno = 0;
44	bind(fd, (struct sockaddr *)&addr, sizeof(addr));
45	ASSERT_EQ(errno, expected_errno, "bind");
46
47close_socket:
48	if (fd >= 0)
49		close(fd);
50}
51
52void test_bind_perm(void)
53{
54	const __u64 net_bind_svc_cap = 1ULL << CAP_NET_BIND_SERVICE;
55	struct bind_perm *skel;
56	__u64 old_caps = 0;
57	int cgroup_fd;
58
59	if (create_netns())
60		return;
61
62	cgroup_fd = test__join_cgroup("/bind_perm");
63	if (CHECK(cgroup_fd < 0, "cg-join", "errno %d", errno))
64		return;
65
66	skel = bind_perm__open_and_load();
67	if (!ASSERT_OK_PTR(skel, "skel"))
68		goto close_cgroup_fd;
69
70	skel->links.bind_v4_prog = bpf_program__attach_cgroup(skel->progs.bind_v4_prog, cgroup_fd);
71	if (!ASSERT_OK_PTR(skel, "bind_v4_prog"))
72		goto close_skeleton;
73
74	skel->links.bind_v6_prog = bpf_program__attach_cgroup(skel->progs.bind_v6_prog, cgroup_fd);
75	if (!ASSERT_OK_PTR(skel, "bind_v6_prog"))
76		goto close_skeleton;
77
78	ASSERT_OK(cap_disable_effective(net_bind_svc_cap, &old_caps),
79		  "cap_disable_effective");
80
81	try_bind(AF_INET, 110, EACCES);
82	try_bind(AF_INET6, 110, EACCES);
83
84	try_bind(AF_INET, 111, 0);
85	try_bind(AF_INET6, 111, 0);
86
87	if (old_caps & net_bind_svc_cap)
88		ASSERT_OK(cap_enable_effective(net_bind_svc_cap, NULL),
89			  "cap_enable_effective");
90
91close_skeleton:
92	bind_perm__destroy(skel);
93close_cgroup_fd:
94	close(cgroup_fd);
95}