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 #include <sys/resource.h> 11 12 struct pair { 13 __u64 packets; 14 __u64 bytes; 15 }; 16 17 int main(int ac, char **argv) 18 { 19 struct bpf_program *prog; 20 struct bpf_object *obj; 21 int map_fd, prog_fd; 22 char filename[256]; 23 int i, sock, err; 24 FILE *f; 25 26 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); 27 obj = bpf_object__open_file(filename, NULL); 28 if (libbpf_get_error(obj)) 29 return 1; 30 31 prog = bpf_object__next_program(obj, NULL); 32 bpf_program__set_type(prog, BPF_PROG_TYPE_SOCKET_FILTER); 33 34 err = bpf_object__load(obj); 35 if (err) 36 return 1; 37 38 prog_fd = bpf_program__fd(prog); 39 map_fd = bpf_object__find_map_fd_by_name(obj, "hash_map"); 40 41 sock = open_raw_sock("lo"); 42 43 assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd, 44 sizeof(prog_fd)) == 0); 45 46 f = popen("ping -4 -c5 localhost", "r"); 47 (void) f; 48 49 for (i = 0; i < 5; i++) { 50 int key = 0, next_key; 51 struct pair value; 52 53 while (bpf_map_get_next_key(map_fd, &key, &next_key) == 0) { 54 bpf_map_lookup_elem(map_fd, &next_key, &value); 55 printf("ip %s bytes %lld packets %lld\n", 56 inet_ntoa((struct in_addr){htonl(next_key)}), 57 value.bytes, value.packets); 58 key = next_key; 59 } 60 sleep(1); 61 } 62 return 0; 63 } 64