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
bpf_find_map(const char * test,struct bpf_object * obj,const char * name)21 static 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
main(int argc,char ** argv)34 int 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
142 err:
143 cleanup_cgroup_environment();
144 free(percpu_netcnt);
145
146 out:
147 return error;
148 }
149