63 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 11struct pair {12 __u64 packets;13 __u64 bytes;14};15 16int main(int ac, char **argv)17{18 struct bpf_program *prog;19 struct bpf_object *obj;20 int map_fd, prog_fd;21 char filename[256];22 int i, sock, err;23 FILE *f;24 25 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);26 obj = bpf_object__open_file(filename, NULL);27 if (libbpf_get_error(obj))28 return 1;29 30 prog = bpf_object__next_program(obj, NULL);31 bpf_program__set_type(prog, BPF_PROG_TYPE_SOCKET_FILTER);32 33 err = bpf_object__load(obj);34 if (err)35 return 1;36 37 prog_fd = bpf_program__fd(prog);38 map_fd = bpf_object__find_map_fd_by_name(obj, "hash_map");39 40 sock = open_raw_sock("lo");41 42 assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd,43 sizeof(prog_fd)) == 0);44 45 f = popen("ping -4 -c5 localhost", "r");46 (void) f;47 48 for (i = 0; i < 5; i++) {49 int key = 0, next_key;50 struct pair value;51 52 while (bpf_map_get_next_key(map_fd, &key, &next_key) == 0) {53 bpf_map_lookup_elem(map_fd, &next_key, &value);54 printf("ip %s bytes %lld packets %lld\n",55 inet_ntoa((struct in_addr){htonl(next_key)}),56 value.bytes, value.packets);57 key = next_key;58 }59 sleep(1);60 }61 return 0;62}63