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
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
|
// SPDX-License-Identifier: GPL-2.0
#include <assert.h>
#include <bpf/bpf.h>
#include <linux/filter.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/sysinfo.h>
#include "bpf_rlimit.h"
#include "cgroup_helpers.h"
char bpf_log_buf[BPF_LOG_BUF_SIZE];
#define TEST_CGROUP "/test-bpf-cgroup-storage-buf/"
int main(int argc, char **argv)
{
struct bpf_insn prog[] = {
BPF_LD_MAP_FD(BPF_REG_1, 0), /* percpu map fd */
BPF_MOV64_IMM(BPF_REG_2, 0), /* flags, not used */
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
BPF_FUNC_get_local_storage),
BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_0, 0),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_3, 0x1),
BPF_STX_MEM(BPF_W, BPF_REG_0, BPF_REG_3, 0),
BPF_LD_MAP_FD(BPF_REG_1, 0), /* map fd */
BPF_MOV64_IMM(BPF_REG_2, 0), /* flags, not used */
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
BPF_FUNC_get_local_storage),
BPF_MOV64_IMM(BPF_REG_1, 1),
BPF_STX_XADD(BPF_DW, BPF_REG_0, BPF_REG_1, 0),
BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_0, 0),
BPF_ALU64_IMM(BPF_AND, BPF_REG_1, 0x1),
BPF_MOV64_REG(BPF_REG_0, BPF_REG_1),
BPF_EXIT_INSN(),
};
size_t insns_cnt = sizeof(prog) / sizeof(struct bpf_insn);
int error = EXIT_FAILURE;
int map_fd, percpu_map_fd, prog_fd, cgroup_fd;
struct bpf_cgroup_storage_key key;
unsigned long long value;
unsigned long long *percpu_value;
int cpu, nproc;
nproc = get_nprocs_conf();
percpu_value = malloc(sizeof(*percpu_value) * nproc);
if (!percpu_value) {
printf("Not enough memory for per-cpu area (%d cpus)\n", nproc);
goto err;
}
map_fd = bpf_create_map(BPF_MAP_TYPE_CGROUP_STORAGE, sizeof(key),
sizeof(value), 0, 0);
if (map_fd < 0) {
printf("Failed to create map: %s\n", strerror(errno));
goto out;
}
percpu_map_fd = bpf_create_map(BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE,
sizeof(key), sizeof(value), 0, 0);
if (percpu_map_fd < 0) {
printf("Failed to create map: %s\n", strerror(errno));
goto out;
}
prog[0].imm = percpu_map_fd;
prog[7].imm = map_fd;
prog_fd = bpf_load_program(BPF_PROG_TYPE_CGROUP_SKB,
prog, insns_cnt, "GPL", 0,
bpf_log_buf, BPF_LOG_BUF_SIZE);
if (prog_fd < 0) {
printf("Failed to load bpf program: %s\n", bpf_log_buf);
goto out;
}
if (setup_cgroup_environment()) {
printf("Failed to setup cgroup environment\n");
goto err;
}
/* Create a cgroup, get fd, and join it */
cgroup_fd = create_and_get_cgroup(TEST_CGROUP);
if (!cgroup_fd) {
printf("Failed to create test cgroup\n");
goto err;
}
if (join_cgroup(TEST_CGROUP)) {
printf("Failed to join cgroup\n");
goto err;
}
/* Attach the bpf program */
if (bpf_prog_attach(prog_fd, cgroup_fd, BPF_CGROUP_INET_EGRESS, 0)) {
printf("Failed to attach bpf program\n");
goto err;
}
if (bpf_map_get_next_key(map_fd, NULL, &key)) {
printf("Failed to get the first key in cgroup storage\n");
goto err;
}
if (bpf_map_lookup_elem(map_fd, &key, &value)) {
printf("Failed to lookup cgroup storage 0\n");
goto err;
}
for (cpu = 0; cpu < nproc; cpu++)
percpu_value[cpu] = 1000;
if (bpf_map_update_elem(percpu_map_fd, &key, percpu_value, 0)) {
printf("Failed to update the data in the cgroup storage\n");
goto err;
}
/* Every second packet should be dropped */
assert(system("ping localhost -c 1 -W 1 -q > /dev/null") == 0);
assert(system("ping localhost -c 1 -W 1 -q > /dev/null"));
assert(system("ping localhost -c 1 -W 1 -q > /dev/null") == 0);
/* Check the counter in the cgroup local storage */
if (bpf_map_lookup_elem(map_fd, &key, &value)) {
printf("Failed to lookup cgroup storage\n");
goto err;
}
if (value != 3) {
printf("Unexpected data in the cgroup storage: %llu\n", value);
goto err;
}
/* Bump the counter in the cgroup local storage */
value++;
if (bpf_map_update_elem(map_fd, &key, &value, 0)) {
printf("Failed to update the data in the cgroup storage\n");
goto err;
}
/* Every second packet should be dropped */
assert(system("ping localhost -c 1 -W 1 -q > /dev/null") == 0);
assert(system("ping localhost -c 1 -W 1 -q > /dev/null"));
assert(system("ping localhost -c 1 -W 1 -q > /dev/null") == 0);
/* Check the final value of the counter in the cgroup local storage */
if (bpf_map_lookup_elem(map_fd, &key, &value)) {
printf("Failed to lookup the cgroup storage\n");
goto err;
}
if (value != 7) {
printf("Unexpected data in the cgroup storage: %llu\n", value);
goto err;
}
/* Check the final value of the counter in the percpu local storage */
for (cpu = 0; cpu < nproc; cpu++)
percpu_value[cpu] = 0;
if (bpf_map_lookup_elem(percpu_map_fd, &key, percpu_value)) {
printf("Failed to lookup the per-cpu cgroup storage\n");
goto err;
}
value = 0;
for (cpu = 0; cpu < nproc; cpu++)
value += percpu_value[cpu];
if (value != nproc * 1000 + 6) {
printf("Unexpected data in the per-cpu cgroup storage\n");
goto err;
}
error = 0;
printf("test_cgroup_storage:PASS\n");
err:
cleanup_cgroup_environment();
free(percpu_value);
out:
return error;
}
|
