1 // SPDX-License-Identifier: GPL-2.0
2 #include <assert.h>
3 #include <bpf/bpf.h>
4 #include <linux/filter.h>
5 #include <stdio.h>
6 #include <stdlib.h>
7 #include <sys/sysinfo.h>
8
9 #include "bpf_rlimit.h"
10 #include "cgroup_helpers.h"
11
12 char bpf_log_buf[BPF_LOG_BUF_SIZE];
13
14 #define TEST_CGROUP "/test-bpf-cgroup-storage-buf/"
15
main(int argc,char ** argv)16 int main(int argc, char **argv)
17 {
18 struct bpf_insn prog[] = {
19 BPF_LD_MAP_FD(BPF_REG_1, 0), /* percpu map fd */
20 BPF_MOV64_IMM(BPF_REG_2, 0), /* flags, not used */
21 BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
22 BPF_FUNC_get_local_storage),
23 BPF_LDX_MEM(BPF_DW, BPF_REG_3, BPF_REG_0, 0),
24 BPF_ALU64_IMM(BPF_ADD, BPF_REG_3, 0x1),
25 BPF_STX_MEM(BPF_DW, BPF_REG_0, BPF_REG_3, 0),
26
27 BPF_LD_MAP_FD(BPF_REG_1, 0), /* map fd */
28 BPF_MOV64_IMM(BPF_REG_2, 0), /* flags, not used */
29 BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
30 BPF_FUNC_get_local_storage),
31 BPF_MOV64_IMM(BPF_REG_1, 1),
32 BPF_ATOMIC_OP(BPF_DW, BPF_ADD, BPF_REG_0, BPF_REG_1, 0),
33 BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_0, 0),
34 BPF_ALU64_IMM(BPF_AND, BPF_REG_1, 0x1),
35 BPF_MOV64_REG(BPF_REG_0, BPF_REG_1),
36 BPF_EXIT_INSN(),
37 };
38 size_t insns_cnt = sizeof(prog) / sizeof(struct bpf_insn);
39 int error = EXIT_FAILURE;
40 int map_fd, percpu_map_fd, prog_fd, cgroup_fd;
41 struct bpf_cgroup_storage_key key;
42 unsigned long long value;
43 unsigned long long *percpu_value;
44 int cpu, nproc;
45
46 nproc = get_nprocs_conf();
47 percpu_value = malloc(sizeof(*percpu_value) * nproc);
48 if (!percpu_value) {
49 printf("Not enough memory for per-cpu area (%d cpus)\n", nproc);
50 goto err;
51 }
52
53 map_fd = bpf_create_map(BPF_MAP_TYPE_CGROUP_STORAGE, sizeof(key),
54 sizeof(value), 0, 0);
55 if (map_fd < 0) {
56 printf("Failed to create map: %s\n", strerror(errno));
57 goto out;
58 }
59
60 percpu_map_fd = bpf_create_map(BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE,
61 sizeof(key), sizeof(value), 0, 0);
62 if (percpu_map_fd < 0) {
63 printf("Failed to create map: %s\n", strerror(errno));
64 goto out;
65 }
66
67 prog[0].imm = percpu_map_fd;
68 prog[7].imm = map_fd;
69 prog_fd = bpf_load_program(BPF_PROG_TYPE_CGROUP_SKB,
70 prog, insns_cnt, "GPL", 0,
71 bpf_log_buf, BPF_LOG_BUF_SIZE);
72 if (prog_fd < 0) {
73 printf("Failed to load bpf program: %s\n", bpf_log_buf);
74 goto out;
75 }
76
77 cgroup_fd = cgroup_setup_and_join(TEST_CGROUP);
78
79 /* Attach the bpf program */
80 if (bpf_prog_attach(prog_fd, cgroup_fd, BPF_CGROUP_INET_EGRESS, 0)) {
81 printf("Failed to attach bpf program\n");
82 goto err;
83 }
84
85 if (bpf_map_get_next_key(map_fd, NULL, &key)) {
86 printf("Failed to get the first key in cgroup storage\n");
87 goto err;
88 }
89
90 if (bpf_map_lookup_elem(map_fd, &key, &value)) {
91 printf("Failed to lookup cgroup storage 0\n");
92 goto err;
93 }
94
95 for (cpu = 0; cpu < nproc; cpu++)
96 percpu_value[cpu] = 1000;
97
98 if (bpf_map_update_elem(percpu_map_fd, &key, percpu_value, 0)) {
99 printf("Failed to update the data in the cgroup storage\n");
100 goto err;
101 }
102
103 /* Every second packet should be dropped */
104 assert(system("ping localhost -c 1 -W 1 -q > /dev/null") == 0);
105 assert(system("ping localhost -c 1 -W 1 -q > /dev/null"));
106 assert(system("ping localhost -c 1 -W 1 -q > /dev/null") == 0);
107
108 /* Check the counter in the cgroup local storage */
109 if (bpf_map_lookup_elem(map_fd, &key, &value)) {
110 printf("Failed to lookup cgroup storage\n");
111 goto err;
112 }
113
114 if (value != 3) {
115 printf("Unexpected data in the cgroup storage: %llu\n", value);
116 goto err;
117 }
118
119 /* Bump the counter in the cgroup local storage */
120 value++;
121 if (bpf_map_update_elem(map_fd, &key, &value, 0)) {
122 printf("Failed to update the data in the cgroup storage\n");
123 goto err;
124 }
125
126 /* Every second packet should be dropped */
127 assert(system("ping localhost -c 1 -W 1 -q > /dev/null") == 0);
128 assert(system("ping localhost -c 1 -W 1 -q > /dev/null"));
129 assert(system("ping localhost -c 1 -W 1 -q > /dev/null") == 0);
130
131 /* Check the final value of the counter in the cgroup local storage */
132 if (bpf_map_lookup_elem(map_fd, &key, &value)) {
133 printf("Failed to lookup the cgroup storage\n");
134 goto err;
135 }
136
137 if (value != 7) {
138 printf("Unexpected data in the cgroup storage: %llu\n", value);
139 goto err;
140 }
141
142 /* Check the final value of the counter in the percpu local storage */
143
144 for (cpu = 0; cpu < nproc; cpu++)
145 percpu_value[cpu] = 0;
146
147 if (bpf_map_lookup_elem(percpu_map_fd, &key, percpu_value)) {
148 printf("Failed to lookup the per-cpu cgroup storage\n");
149 goto err;
150 }
151
152 value = 0;
153 for (cpu = 0; cpu < nproc; cpu++)
154 value += percpu_value[cpu];
155
156 if (value != nproc * 1000 + 6) {
157 printf("Unexpected data in the per-cpu cgroup storage\n");
158 goto err;
159 }
160
161 error = 0;
162 printf("test_cgroup_storage:PASS\n");
163
164 err:
165 cleanup_cgroup_environment();
166 free(percpu_value);
167
168 out:
169 return error;
170 }
171