// SPDX-License-Identifier: GPL-2.0 #include <stdio.h> #include <assert.h> #include <linux/bpf.h> #include <bpf/bpf.h> #include <bpf/libbpf.h> #include "sock_example.h" #include <unistd.h> #include <arpa/inet.h> #include <sys/resource.h> struct pair { __u64 packets; __u64 bytes; }; int main(int ac, char **argv) { struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; struct bpf_object *obj; int map_fd, prog_fd; char filename[256]; int i, sock; FILE *f; snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); setrlimit(RLIMIT_MEMLOCK, &r); if (bpf_prog_load(filename, BPF_PROG_TYPE_SOCKET_FILTER, &obj, &prog_fd)) return 1; map_fd = bpf_object__find_map_fd_by_name(obj, "hash_map"); sock = open_raw_sock("lo"); assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd, sizeof(prog_fd)) == 0); f = popen("ping -4 -c5 localhost", "r"); (void) f; for (i = 0; i < 5; i++) { int key = 0, next_key; struct pair value; while (bpf_map_get_next_key(map_fd, &key, &next_key) == 0) { bpf_map_lookup_elem(map_fd, &next_key, &value); printf("ip %s bytes %lld packets %lld\n", inet_ntoa((struct in_addr){htonl(next_key)}), value.bytes, value.packets); key = next_key; } sleep(1); } return 0; }