64 lines · c
1// SPDX-License-Identifier: GPL-2.02#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 11int 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