1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
// SPDX-License-Identifier: GPL-2.0
#include <linux/bpf.h>
#include <stdint.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_core_read.h>
#include "bpf_misc.h"
struct core_reloc_bitfields {
/* unsigned bitfields */
uint8_t ub1: 1;
uint8_t ub2: 2;
uint32_t ub7: 7;
/* signed bitfields */
int8_t sb4: 4;
int32_t sb20: 20;
/* non-bitfields */
uint32_t u32;
int32_t s32;
} __attribute__((preserve_access_index));
SEC("tc")
__description("single CO-RE bitfield roundtrip")
__btf_path("btf__core_reloc_bitfields.bpf.o")
__success
__retval(3)
int single_field_roundtrip(struct __sk_buff *ctx)
{
struct core_reloc_bitfields bitfields;
__builtin_memset(&bitfields, 0, sizeof(bitfields));
BPF_CORE_WRITE_BITFIELD(&bitfields, ub2, 3);
return BPF_CORE_READ_BITFIELD(&bitfields, ub2);
}
SEC("tc")
__description("multiple CO-RE bitfield roundtrip")
__btf_path("btf__core_reloc_bitfields.bpf.o")
__success
__retval(0x3FD)
int multiple_field_roundtrip(struct __sk_buff *ctx)
{
struct core_reloc_bitfields bitfields;
uint8_t ub2;
int8_t sb4;
__builtin_memset(&bitfields, 0, sizeof(bitfields));
BPF_CORE_WRITE_BITFIELD(&bitfields, ub2, 1);
BPF_CORE_WRITE_BITFIELD(&bitfields, sb4, -1);
ub2 = BPF_CORE_READ_BITFIELD(&bitfields, ub2);
sb4 = BPF_CORE_READ_BITFIELD(&bitfields, sb4);
return (((uint8_t)sb4) << 2) | ub2;
}
SEC("tc")
__description("adjacent CO-RE bitfield roundtrip")
__btf_path("btf__core_reloc_bitfields.bpf.o")
__success
__retval(7)
int adjacent_field_roundtrip(struct __sk_buff *ctx)
{
struct core_reloc_bitfields bitfields;
uint8_t ub1, ub2;
__builtin_memset(&bitfields, 0, sizeof(bitfields));
BPF_CORE_WRITE_BITFIELD(&bitfields, ub1, 1);
BPF_CORE_WRITE_BITFIELD(&bitfields, ub2, 3);
ub1 = BPF_CORE_READ_BITFIELD(&bitfields, ub1);
ub2 = BPF_CORE_READ_BITFIELD(&bitfields, ub2);
return (ub2 << 1) | ub1;
}
SEC("tc")
__description("multibyte CO-RE bitfield roundtrip")
__btf_path("btf__core_reloc_bitfields.bpf.o")
__success
__retval(0x21)
int multibyte_field_roundtrip(struct __sk_buff *ctx)
{
struct core_reloc_bitfields bitfields;
uint32_t ub7;
uint8_t ub1;
__builtin_memset(&bitfields, 0, sizeof(bitfields));
BPF_CORE_WRITE_BITFIELD(&bitfields, ub1, 1);
BPF_CORE_WRITE_BITFIELD(&bitfields, ub7, 16);
ub1 = BPF_CORE_READ_BITFIELD(&bitfields, ub1);
ub7 = BPF_CORE_READ_BITFIELD(&bitfields, ub7);
return (ub7 << 1) | ub1;
}
char _license[] SEC("license") = "GPL";
|
