1 // SPDX-License-Identifier: GPL-2.0
2 
3 #include <sys/sysinfo.h>
4 #include <test_progs.h>
5 #include "network_helpers.h"
6 #include "netcnt_prog.skel.h"
7 #include "netcnt_common.h"
8 
9 #define CG_NAME "/netcnt"
10 
11 void serial_test_netcnt(void)
12 {
13 	union percpu_net_cnt *percpu_netcnt = NULL;
14 	struct bpf_cgroup_storage_key key;
15 	int map_fd, percpu_map_fd;
16 	struct netcnt_prog *skel;
17 	unsigned long packets;
18 	union net_cnt netcnt;
19 	unsigned long bytes;
20 	int cpu, nproc;
21 	int cg_fd = -1;
22 	char cmd[128];
23 
24 	skel = netcnt_prog__open_and_load();
25 	if (!ASSERT_OK_PTR(skel, "netcnt_prog__open_and_load"))
26 		return;
27 
28 	nproc = bpf_num_possible_cpus();
29 	percpu_netcnt = malloc(sizeof(*percpu_netcnt) * nproc);
30 	if (!ASSERT_OK_PTR(percpu_netcnt, "malloc(percpu_netcnt)"))
31 		goto err;
32 
33 	cg_fd = test__join_cgroup(CG_NAME);
34 	if (!ASSERT_GE(cg_fd, 0, "test__join_cgroup"))
35 		goto err;
36 
37 	skel->links.bpf_nextcnt = bpf_program__attach_cgroup(skel->progs.bpf_nextcnt, cg_fd);
38 	if (!ASSERT_OK_PTR(skel->links.bpf_nextcnt,
39 			   "attach_cgroup(bpf_nextcnt)"))
40 		goto err;
41 
42 	snprintf(cmd, sizeof(cmd), "%s ::1 -A -c 10000 -q > /dev/null", ping_command(AF_INET6));
43 	ASSERT_OK(system(cmd), cmd);
44 
45 	map_fd = bpf_map__fd(skel->maps.netcnt);
46 	if (!ASSERT_OK(bpf_map_get_next_key(map_fd, NULL, &key), "bpf_map_get_next_key"))
47 		goto err;
48 
49 	if (!ASSERT_OK(bpf_map_lookup_elem(map_fd, &key, &netcnt), "bpf_map_lookup_elem(netcnt)"))
50 		goto err;
51 
52 	percpu_map_fd = bpf_map__fd(skel->maps.percpu_netcnt);
53 	if (!ASSERT_OK(bpf_map_lookup_elem(percpu_map_fd, &key, &percpu_netcnt[0]),
54 		       "bpf_map_lookup_elem(percpu_netcnt)"))
55 		goto err;
56 
57 	/* Some packets can be still in per-cpu cache, but not more than
58 	 * MAX_PERCPU_PACKETS.
59 	 */
60 	packets = netcnt.packets;
61 	bytes = netcnt.bytes;
62 	for (cpu = 0; cpu < nproc; cpu++) {
63 		ASSERT_LE(percpu_netcnt[cpu].packets, MAX_PERCPU_PACKETS, "MAX_PERCPU_PACKETS");
64 
65 		packets += percpu_netcnt[cpu].packets;
66 		bytes += percpu_netcnt[cpu].bytes;
67 	}
68 
69 	/* No packets should be lost */
70 	ASSERT_EQ(packets, 10000, "packets");
71 
72 	/* Let's check that bytes counter matches the number of packets
73 	 * multiplied by the size of ipv6 ICMP packet.
74 	 */
75 	ASSERT_EQ(bytes, packets * 104, "bytes");
76 
77 err:
78 	if (cg_fd != -1)
79 		close(cg_fd);
80 	free(percpu_netcnt);
81 	netcnt_prog__destroy(skel);
82 }
83