1 // SPDX-License-Identifier: GPL-2.0
5 #include <bpf/libbpf.h>
6 #include "sock_example.h"
9 #include <sys/resource.h>
11 struct flow_key_record {
26 int main(int argc, char **argv)
28 int i, sock, key, fd, main_prog_fd, jmp_table_fd, hash_map_fd;
29 struct bpf_program *prog;
30 struct bpf_object *obj;
35 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
37 obj = bpf_object__open_file(filename, NULL);
38 if (libbpf_get_error(obj)) {
39 fprintf(stderr, "ERROR: opening BPF object file failed\n");
43 /* load BPF program */
44 if (bpf_object__load(obj)) {
45 fprintf(stderr, "ERROR: loading BPF object file failed\n");
49 jmp_table_fd = bpf_object__find_map_fd_by_name(obj, "jmp_table");
50 hash_map_fd = bpf_object__find_map_fd_by_name(obj, "hash_map");
51 if (jmp_table_fd < 0 || hash_map_fd < 0) {
52 fprintf(stderr, "ERROR: finding a map in obj file failed\n");
56 bpf_object__for_each_program(prog, obj) {
57 fd = bpf_program__fd(prog);
59 section = bpf_program__section_name(prog);
60 if (sscanf(section, "socket/%d", &key) != 1) {
61 fprintf(stderr, "ERROR: finding prog failed\n");
68 bpf_map_update_elem(jmp_table_fd, &key, &fd, BPF_ANY);
71 sock = open_raw_sock("lo");
73 /* attach BPF program to socket */
74 assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &main_prog_fd,
78 f = popen("ping -4 -c5 localhost", "r");
80 f = popen("netperf -l 4 localhost", "r");
83 for (i = 0; i < 5; i++) {
84 struct flow_key_record key = {}, next_key;
88 printf("IP src.port -> dst.port bytes packets\n");
89 while (bpf_map_get_next_key(hash_map_fd, &key, &next_key) == 0) {
90 bpf_map_lookup_elem(hash_map_fd, &next_key, &value);
91 printf("%s.%05d -> %s.%05d %12lld %12lld\n",
92 inet_ntoa((struct in_addr){htonl(next_key.src)}),
94 inet_ntoa((struct in_addr){htonl(next_key.dst)}),
96 value.bytes, value.packets);
102 bpf_object__close(obj);