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// SPDX-License-Identifier: GPL-2.0
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <sys/sysinfo.h>
#include <sys/time.h>
#include <linux/bpf.h>
#include <bpf/bpf.h>
#include <bpf/libbpf.h>
#include "cgroup_helpers.h"
#include "bpf_rlimit.h"
#include "netcnt_common.h"
#define BPF_PROG "./netcnt_prog.o"
#define TEST_CGROUP "/test-network-counters/"
static int bpf_find_map(const char *test, struct bpf_object *obj,
const char *name)
{
struct bpf_map *map;
map = bpf_object__find_map_by_name(obj, name);
if (!map) {
printf("%s:FAIL:map '%s' not found\n", test, name);
return -1;
}
return bpf_map__fd(map);
}
int main(int argc, char **argv)
{
union percpu_net_cnt *percpu_netcnt;
struct bpf_cgroup_storage_key key;
int map_fd, percpu_map_fd;
int error = EXIT_FAILURE;
struct bpf_object *obj;
int prog_fd, cgroup_fd;
unsigned long packets;
union net_cnt netcnt;
unsigned long bytes;
int cpu, nproc;
__u32 prog_cnt;
nproc = get_nprocs_conf();
percpu_netcnt = malloc(sizeof(*percpu_netcnt) * nproc);
if (!percpu_netcnt) {
printf("Not enough memory for per-cpu area (%d cpus)\n", nproc);
goto err;
}
if (bpf_prog_load(BPF_PROG, BPF_PROG_TYPE_CGROUP_SKB,
&obj, &prog_fd)) {
printf("Failed to load bpf program\n");
goto out;
}
cgroup_fd = cgroup_setup_and_join(TEST_CGROUP);
if (cgroup_fd < 0)
goto err;
/* Attach bpf program */
if (bpf_prog_attach(prog_fd, cgroup_fd, BPF_CGROUP_INET_EGRESS, 0)) {
printf("Failed to attach bpf program");
goto err;
}
if (system("which ping6 &>/dev/null") == 0)
assert(!system("ping6 ::1 -c 10000 -f -q > /dev/null"));
else
assert(!system("ping -6 ::1 -c 10000 -f -q > /dev/null"));
if (bpf_prog_query(cgroup_fd, BPF_CGROUP_INET_EGRESS, 0, NULL, NULL,
&prog_cnt)) {
printf("Failed to query attached programs");
goto err;
}
map_fd = bpf_find_map(__func__, obj, "netcnt");
if (map_fd < 0) {
printf("Failed to find bpf map with net counters");
goto err;
}
percpu_map_fd = bpf_find_map(__func__, obj, "percpu_netcnt");
if (percpu_map_fd < 0) {
printf("Failed to find bpf map with percpu net counters");
goto err;
}
if (bpf_map_get_next_key(map_fd, NULL, &key)) {
printf("Failed to get key in cgroup storage\n");
goto err;
}
if (bpf_map_lookup_elem(map_fd, &key, &netcnt)) {
printf("Failed to lookup cgroup storage\n");
goto err;
}
if (bpf_map_lookup_elem(percpu_map_fd, &key, &percpu_netcnt[0])) {
printf("Failed to lookup percpu cgroup storage\n");
goto err;
}
/* Some packets can be still in per-cpu cache, but not more than
* MAX_PERCPU_PACKETS.
*/
packets = netcnt.packets;
bytes = netcnt.bytes;
for (cpu = 0; cpu < nproc; cpu++) {
if (percpu_netcnt[cpu].packets > MAX_PERCPU_PACKETS) {
printf("Unexpected percpu value: %llu\n",
percpu_netcnt[cpu].packets);
goto err;
}
packets += percpu_netcnt[cpu].packets;
bytes += percpu_netcnt[cpu].bytes;
}
/* No packets should be lost */
if (packets != 10000) {
printf("Unexpected packet count: %lu\n", packets);
goto err;
}
/* Let's check that bytes counter matches the number of packets
* multiplied by the size of ipv6 ICMP packet.
*/
if (bytes != packets * 104) {
printf("Unexpected bytes count: %lu\n", bytes);
goto err;
}
error = 0;
printf("test_netcnt:PASS\n");
err:
cleanup_cgroup_environment();
free(percpu_netcnt);
out:
return error;
}
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