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 rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; 20 struct bpf_object *obj; 21 int map_fd, prog_fd; 22 char filename[256]; 23 int i, sock; 24 FILE *f; 25 26 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); 27 setrlimit(RLIMIT_MEMLOCK, &r); 28 29 if (bpf_prog_load(filename, BPF_PROG_TYPE_SOCKET_FILTER, 30 &obj, &prog_fd)) 31 return 1; 32 33 map_fd = bpf_object__find_map_fd_by_name(obj, "hash_map"); 34 35 sock = open_raw_sock("lo"); 36 37 assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd, 38 sizeof(prog_fd)) == 0); 39 40 f = popen("ping -4 -c5 localhost", "r"); 41 (void) f; 42 43 for (i = 0; i < 5; i++) { 44 int key = 0, next_key; 45 struct pair value; 46 47 while (bpf_map_get_next_key(map_fd, &key, &next_key) == 0) { 48 bpf_map_lookup_elem(map_fd, &next_key, &value); 49 printf("ip %s bytes %lld packets %lld\n", 50 inet_ntoa((struct in_addr){htonl(next_key)}), 51 value.bytes, value.packets); 52 key = next_key; 53 } 54 sleep(1); 55 } 56 return 0; 57 } 58