sockex2_user.c (1374B)
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 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}