1 // SPDX-License-Identifier: GPL-2.0 2 #include <stdio.h> 3 #include <assert.h> 4 #include <linux/bpf.h> 5 #include <bpf/bpf.h> 6 #include <bpf/libbpf.h> 7 #include "sock_example.h" 8 #include <unistd.h> 9 #include <arpa/inet.h> 10 11 int main(int ac, char **argv) 12 { 13 struct bpf_object *obj; 14 struct bpf_program *prog; 15 int map_fd, prog_fd; 16 char filename[256]; 17 int i, sock, err; 18 FILE *f; 19 20 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); 21 22 obj = bpf_object__open_file(filename, NULL); 23 if (libbpf_get_error(obj)) 24 return 1; 25 26 prog = bpf_object__next_program(obj, NULL); 27 bpf_program__set_type(prog, BPF_PROG_TYPE_SOCKET_FILTER); 28 29 err = bpf_object__load(obj); 30 if (err) 31 return 1; 32 33 prog_fd = bpf_program__fd(prog); 34 map_fd = bpf_object__find_map_fd_by_name(obj, "my_map"); 35 36 sock = open_raw_sock("lo"); 37 38 assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd, 39 sizeof(prog_fd)) == 0); 40 41 f = popen("ping -4 -c5 localhost", "r"); 42 (void) f; 43 44 for (i = 0; i < 5; i++) { 45 long long tcp_cnt, udp_cnt, icmp_cnt; 46 int key; 47 48 key = IPPROTO_TCP; 49 assert(bpf_map_lookup_elem(map_fd, &key, &tcp_cnt) == 0); 50 51 key = IPPROTO_UDP; 52 assert(bpf_map_lookup_elem(map_fd, &key, &udp_cnt) == 0); 53 54 key = IPPROTO_ICMP; 55 assert(bpf_map_lookup_elem(map_fd, &key, &icmp_cnt) == 0); 56 57 printf("TCP %lld UDP %lld ICMP %lld bytes\n", 58 tcp_cnt, udp_cnt, icmp_cnt); 59 sleep(1); 60 } 61 62 return 0; 63 } 64