1// SPDX-License-Identifier: GPL-2.0
2#include <stdio.h>
3#include <stdlib.h>
4#include <string.h>
5#include <errno.h>
6#include <assert.h>
7#include <sys/sysinfo.h>
8#include <sys/time.h>
9
10#include <linux/bpf.h>
11#include <bpf/bpf.h>
12#include <bpf/libbpf.h>
13
14#include "cgroup_helpers.h"
15#include "bpf_rlimit.h"
16#include "netcnt_common.h"
17
18#define BPF_PROG "./netcnt_prog.o"
19#define TEST_CGROUP "/test-network-counters/"
20
21static int bpf_find_map(const char *test, struct bpf_object *obj,
22			const char *name)
23{
24	struct bpf_map *map;
25
26	map = bpf_object__find_map_by_name(obj, name);
27	if (!map) {
28		printf("%s:FAIL:map '%s' not found\n", test, name);
29		return -1;
30	}
31	return bpf_map__fd(map);
32}
33
34int main(int argc, char **argv)
35{
36	struct percpu_net_cnt *percpu_netcnt;
37	struct bpf_cgroup_storage_key key;
38	int map_fd, percpu_map_fd;
39	int error = EXIT_FAILURE;
40	struct net_cnt netcnt;
41	struct bpf_object *obj;
42	int prog_fd, cgroup_fd;
43	unsigned long packets;
44	unsigned long bytes;
45	int cpu, nproc;
46	__u32 prog_cnt;
47
48	nproc = get_nprocs_conf();
49	percpu_netcnt = malloc(sizeof(*percpu_netcnt) * nproc);
50	if (!percpu_netcnt) {
51		printf("Not enough memory for per-cpu area (%d cpus)\n", nproc);
52		goto err;
53	}
54
55	if (bpf_prog_load(BPF_PROG, BPF_PROG_TYPE_CGROUP_SKB,
56			  &obj, &prog_fd)) {
57		printf("Failed to load bpf program\n");
58		goto out;
59	}
60
61	cgroup_fd = cgroup_setup_and_join(TEST_CGROUP);
62	if (cgroup_fd < 0)
63		goto err;
64
65	/* Attach bpf program */
66	if (bpf_prog_attach(prog_fd, cgroup_fd, BPF_CGROUP_INET_EGRESS, 0)) {
67		printf("Failed to attach bpf program");
68		goto err;
69	}
70
71	if (system("which ping6 &>/dev/null") == 0)
72		assert(!system("ping6 ::1 -c 10000 -f -q > /dev/null"));
73	else
74		assert(!system("ping -6 ::1 -c 10000 -f -q > /dev/null"));
75
76	if (bpf_prog_query(cgroup_fd, BPF_CGROUP_INET_EGRESS, 0, NULL, NULL,
77			   &prog_cnt)) {
78		printf("Failed to query attached programs");
79		goto err;
80	}
81
82	map_fd = bpf_find_map(__func__, obj, "netcnt");
83	if (map_fd < 0) {
84		printf("Failed to find bpf map with net counters");
85		goto err;
86	}
87
88	percpu_map_fd = bpf_find_map(__func__, obj, "percpu_netcnt");
89	if (percpu_map_fd < 0) {
90		printf("Failed to find bpf map with percpu net counters");
91		goto err;
92	}
93
94	if (bpf_map_get_next_key(map_fd, NULL, &key)) {
95		printf("Failed to get key in cgroup storage\n");
96		goto err;
97	}
98
99	if (bpf_map_lookup_elem(map_fd, &key, &netcnt)) {
100		printf("Failed to lookup cgroup storage\n");
101		goto err;
102	}
103
104	if (bpf_map_lookup_elem(percpu_map_fd, &key, &percpu_netcnt[0])) {
105		printf("Failed to lookup percpu cgroup storage\n");
106		goto err;
107	}
108
109	/* Some packets can be still in per-cpu cache, but not more than
110	 * MAX_PERCPU_PACKETS.
111	 */
112	packets = netcnt.packets;
113	bytes = netcnt.bytes;
114	for (cpu = 0; cpu < nproc; cpu++) {
115		if (percpu_netcnt[cpu].packets > MAX_PERCPU_PACKETS) {
116			printf("Unexpected percpu value: %llu\n",
117			       percpu_netcnt[cpu].packets);
118			goto err;
119		}
120
121		packets += percpu_netcnt[cpu].packets;
122		bytes += percpu_netcnt[cpu].bytes;
123	}
124
125	/* No packets should be lost */
126	if (packets != 10000) {
127		printf("Unexpected packet count: %lu\n", packets);
128		goto err;
129	}
130
131	/* Let's check that bytes counter matches the number of packets
132	 * multiplied by the size of ipv6 ICMP packet.
133	 */
134	if (bytes != packets * 104) {
135		printf("Unexpected bytes count: %lu\n", bytes);
136		goto err;
137	}
138
139	error = 0;
140	printf("test_netcnt:PASS\n");
141
142err:
143	cleanup_cgroup_environment();
144	free(percpu_netcnt);
145
146out:
147	return error;
148}
149