1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2020 Facebook */
3 #include <linux/error-injection.h>
4 #include <linux/init.h>
5 #include <linux/module.h>
6 #include <linux/sysfs.h>
7 #include <linux/tracepoint.h>
8 #include "bpf_testmod.h"
9 
10 #define CREATE_TRACE_POINTS
11 #include "bpf_testmod-events.h"
12 
13 noinline ssize_t
14 bpf_testmod_test_read(struct file *file, struct kobject *kobj,
15 		      struct bin_attribute *bin_attr,
16 		      char *buf, loff_t off, size_t len)
17 {
18 	struct bpf_testmod_test_read_ctx ctx = {
19 		.buf = buf,
20 		.off = off,
21 		.len = len,
22 	};
23 
24 	trace_bpf_testmod_test_read(current, &ctx);
25 
26 	return -EIO; /* always fail */
27 }
28 EXPORT_SYMBOL(bpf_testmod_test_read);
29 ALLOW_ERROR_INJECTION(bpf_testmod_test_read, ERRNO);
30 
31 static struct bin_attribute bin_attr_bpf_testmod_file __ro_after_init = {
32 	.attr = { .name = "bpf_testmod", .mode = 0444, },
33 	.read = bpf_testmod_test_read,
34 };
35 
36 static int bpf_testmod_init(void)
37 {
38 	return sysfs_create_bin_file(kernel_kobj, &bin_attr_bpf_testmod_file);
39 }
40 
41 static void bpf_testmod_exit(void)
42 {
43 	return sysfs_remove_bin_file(kernel_kobj, &bin_attr_bpf_testmod_file);
44 }
45 
46 module_init(bpf_testmod_init);
47 module_exit(bpf_testmod_exit);
48 
49 MODULE_AUTHOR("Andrii Nakryiko");
50 MODULE_DESCRIPTION("BPF selftests module");
51 MODULE_LICENSE("Dual BSD/GPL");
52 
53