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// SPDX-License-Identifier: GPL-2.0
#include <assert.h>
#include <bpf/bpf.h>
#include <linux/filter.h>
#include <stdio.h>
#include <stdlib.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), /* 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, prog_fd, cgroup_fd;
struct bpf_cgroup_storage_key key;
unsigned long long value;
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;
}
prog[0].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\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;
}
error = 0;
printf("test_cgroup_storage:PASS\n");
err:
cleanup_cgroup_environment();
out:
return error;
}
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