1 // SPDX-License-Identifier: GPL-2.0-only
2
3 /*
4 * Copyright 2021 Google LLC.
5 */
6
7 #include <errno.h>
8 #include <linux/bpf.h>
9 #include <bpf/bpf_helpers.h>
10
11 __u32 invocations = 0;
12 __u32 assertion_error = 0;
13 __u32 retval_value = 0;
14 __s32 page_size = 0;
15
16 SEC("cgroup/setsockopt")
17 int get_retval(struct bpf_sockopt *ctx)
18 {
19 retval_value = bpf_get_retval();
20 __sync_fetch_and_add(&invocations, 1);
21
22 /* optval larger than PAGE_SIZE use kernel's buffer. */
23 if (ctx->optlen > page_size)
24 ctx->optlen = 0;
25
26 return 1;
27 }
28
29 SEC("cgroup/setsockopt")
30 int set_eunatch(struct bpf_sockopt *ctx)
31 {
32 __sync_fetch_and_add(&invocations, 1);
33
34 if (bpf_set_retval(-EUNATCH))
35 assertion_error = 1;
36
37 /* optval larger than PAGE_SIZE use kernel's buffer. */
38 if (ctx->optlen > page_size)
39 ctx->optlen = 0;
40
41 return 0;
42 }
43
44 SEC("cgroup/setsockopt")
45 int set_eisconn(struct bpf_sockopt *ctx)
46 {
47 __sync_fetch_and_add(&invocations, 1);
48
49 if (bpf_set_retval(-EISCONN))
50 assertion_error = 1;
51
52 /* optval larger than PAGE_SIZE use kernel's buffer. */
53 if (ctx->optlen > page_size)
54 ctx->optlen = 0;
55
56 return 0;
57 }
58
59 SEC("cgroup/setsockopt")
60 int legacy_eperm(struct bpf_sockopt *ctx)
61 {
62 __sync_fetch_and_add(&invocations, 1);
63
64 /* optval larger than PAGE_SIZE use kernel's buffer. */
65 if (ctx->optlen > page_size)
66 ctx->optlen = 0;
67
68 return 0;
69 }
70
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