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