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
12 static int duration;
13
create_netns(void)14 static int create_netns(void)
15 {
16 if (!ASSERT_OK(unshare(CLONE_NEWNET), "create netns"))
17 return -1;
18
19 return 0;
20 }
21
try_bind(int family,int port,int expected_errno)22 void 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
47 close_socket:
48 if (fd >= 0)
49 close(fd);
50 }
51
test_bind_perm(void)52 void 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
91 close_skeleton:
92 bind_perm__destroy(skel);
93 close_cgroup_fd:
94 close(cgroup_fd);
95 }
96