1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2021 Facebook */
3 #include <vmlinux.h>
4 #include <bpf/bpf_helpers.h>
5
6 extern int bpf_kfunc_call_test2(struct sock *sk, __u32 a, __u32 b) __ksym;
7 extern __u64 bpf_kfunc_call_test1(struct sock *sk, __u32 a, __u64 b,
8 __u32 c, __u64 d) __ksym;
9
10 extern struct prog_test_ref_kfunc *bpf_kfunc_call_test_acquire(unsigned long *sp) __ksym;
11 extern void bpf_kfunc_call_test_release(struct prog_test_ref_kfunc *p) __ksym;
12 extern void bpf_kfunc_call_test_pass_ctx(struct __sk_buff *skb) __ksym;
13 extern void bpf_kfunc_call_test_pass1(struct prog_test_pass1 *p) __ksym;
14 extern void bpf_kfunc_call_test_pass2(struct prog_test_pass2 *p) __ksym;
15 extern void bpf_kfunc_call_test_mem_len_pass1(void *mem, int len) __ksym;
16 extern void bpf_kfunc_call_test_mem_len_fail2(__u64 *mem, int len) __ksym;
17 extern int *bpf_kfunc_call_test_get_rdwr_mem(struct prog_test_ref_kfunc *p, const int rdwr_buf_size) __ksym;
18 extern int *bpf_kfunc_call_test_get_rdonly_mem(struct prog_test_ref_kfunc *p, const int rdonly_buf_size) __ksym;
19
20 SEC("tc")
kfunc_call_test2(struct __sk_buff * skb)21 int kfunc_call_test2(struct __sk_buff *skb)
22 {
23 struct bpf_sock *sk = skb->sk;
24
25 if (!sk)
26 return -1;
27
28 sk = bpf_sk_fullsock(sk);
29 if (!sk)
30 return -1;
31
32 return bpf_kfunc_call_test2((struct sock *)sk, 1, 2);
33 }
34
35 SEC("tc")
kfunc_call_test1(struct __sk_buff * skb)36 int kfunc_call_test1(struct __sk_buff *skb)
37 {
38 struct bpf_sock *sk = skb->sk;
39 __u64 a = 1ULL << 32;
40 __u32 ret;
41
42 if (!sk)
43 return -1;
44
45 sk = bpf_sk_fullsock(sk);
46 if (!sk)
47 return -1;
48
49 a = bpf_kfunc_call_test1((struct sock *)sk, 1, a | 2, 3, a | 4);
50 ret = a >> 32; /* ret should be 2 */
51 ret += (__u32)a; /* ret should be 12 */
52
53 return ret;
54 }
55
56 SEC("tc")
kfunc_call_test_ref_btf_id(struct __sk_buff * skb)57 int kfunc_call_test_ref_btf_id(struct __sk_buff *skb)
58 {
59 struct prog_test_ref_kfunc *pt;
60 unsigned long s = 0;
61 int ret = 0;
62
63 pt = bpf_kfunc_call_test_acquire(&s);
64 if (pt) {
65 if (pt->a != 42 || pt->b != 108)
66 ret = -1;
67 bpf_kfunc_call_test_release(pt);
68 }
69 return ret;
70 }
71
72 SEC("tc")
kfunc_call_test_pass(struct __sk_buff * skb)73 int kfunc_call_test_pass(struct __sk_buff *skb)
74 {
75 struct prog_test_pass1 p1 = {};
76 struct prog_test_pass2 p2 = {};
77 short a = 0;
78 __u64 b = 0;
79 long c = 0;
80 char d = 0;
81 int e = 0;
82
83 bpf_kfunc_call_test_pass_ctx(skb);
84 bpf_kfunc_call_test_pass1(&p1);
85 bpf_kfunc_call_test_pass2(&p2);
86
87 bpf_kfunc_call_test_mem_len_pass1(&a, sizeof(a));
88 bpf_kfunc_call_test_mem_len_pass1(&b, sizeof(b));
89 bpf_kfunc_call_test_mem_len_pass1(&c, sizeof(c));
90 bpf_kfunc_call_test_mem_len_pass1(&d, sizeof(d));
91 bpf_kfunc_call_test_mem_len_pass1(&e, sizeof(e));
92 bpf_kfunc_call_test_mem_len_fail2(&b, -1);
93
94 return 0;
95 }
96
97 struct syscall_test_args {
98 __u8 data[16];
99 size_t size;
100 };
101
102 SEC("syscall")
kfunc_syscall_test(struct syscall_test_args * args)103 int kfunc_syscall_test(struct syscall_test_args *args)
104 {
105 const long size = args->size;
106
107 if (size > sizeof(args->data))
108 return -7; /* -E2BIG */
109
110 bpf_kfunc_call_test_mem_len_pass1(&args->data, sizeof(args->data));
111 bpf_kfunc_call_test_mem_len_pass1(&args->data, sizeof(*args));
112 bpf_kfunc_call_test_mem_len_pass1(&args->data, size);
113
114 return 0;
115 }
116
117 SEC("syscall")
kfunc_syscall_test_null(struct syscall_test_args * args)118 int kfunc_syscall_test_null(struct syscall_test_args *args)
119 {
120 /* Must be called with args as a NULL pointer
121 * we do not check for it to have the verifier consider that
122 * the pointer might not be null, and so we can load it.
123 *
124 * So the following can not be added:
125 *
126 * if (args)
127 * return -22;
128 */
129
130 bpf_kfunc_call_test_mem_len_pass1(args, 0);
131
132 return 0;
133 }
134
135 SEC("tc")
kfunc_call_test_get_mem(struct __sk_buff * skb)136 int kfunc_call_test_get_mem(struct __sk_buff *skb)
137 {
138 struct prog_test_ref_kfunc *pt;
139 unsigned long s = 0;
140 int *p = NULL;
141 int ret = 0;
142
143 pt = bpf_kfunc_call_test_acquire(&s);
144 if (pt) {
145 p = bpf_kfunc_call_test_get_rdwr_mem(pt, 2 * sizeof(int));
146 if (p) {
147 p[0] = 42;
148 ret = p[1]; /* 108 */
149 } else {
150 ret = -1;
151 }
152
153 if (ret >= 0) {
154 p = bpf_kfunc_call_test_get_rdonly_mem(pt, 2 * sizeof(int));
155 if (p)
156 ret = p[0]; /* 42 */
157 else
158 ret = -1;
159 }
160
161 bpf_kfunc_call_test_release(pt);
162 }
163 return ret;
164 }
165
166 char _license[] SEC("license") = "GPL";
167