101 lines · c
1// SPDX-License-Identifier: GPL-2.02#include <stdio.h>3#include <assert.h>4#include <bpf/bpf.h>5#include <bpf/libbpf.h>6#include "sock_example.h"7#include <unistd.h>8#include <arpa/inet.h>9 10struct flow_key_record {11 __be32 src;12 __be32 dst;13 union {14 __be32 ports;15 __be16 port16[2];16 };17 __u32 ip_proto;18};19 20struct pair {21 __u64 packets;22 __u64 bytes;23};24 25int main(int argc, char **argv)26{27 int i, sock, fd, main_prog_fd, hash_map_fd;28 struct bpf_program *prog;29 struct bpf_object *obj;30 char filename[256];31 FILE *f;32 33 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);34 35 obj = bpf_object__open_file(filename, NULL);36 if (libbpf_get_error(obj)) {37 fprintf(stderr, "ERROR: opening BPF object file failed\n");38 return 0;39 }40 41 /* load BPF program */42 if (bpf_object__load(obj)) {43 fprintf(stderr, "ERROR: loading BPF object file failed\n");44 goto cleanup;45 }46 47 hash_map_fd = bpf_object__find_map_fd_by_name(obj, "hash_map");48 if (hash_map_fd < 0) {49 fprintf(stderr, "ERROR: finding a map in obj file failed\n");50 goto cleanup;51 }52 53 /* find BPF main program */54 main_prog_fd = 0;55 bpf_object__for_each_program(prog, obj) {56 fd = bpf_program__fd(prog);57 58 if (!strcmp(bpf_program__name(prog), "main_prog"))59 main_prog_fd = fd;60 }61 62 if (main_prog_fd == 0) {63 fprintf(stderr, "ERROR: can't find main_prog\n");64 goto cleanup;65 }66 67 sock = open_raw_sock("lo");68 69 /* attach BPF program to socket */70 assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &main_prog_fd,71 sizeof(__u32)) == 0);72 73 if (argc > 1)74 f = popen("ping -4 -c5 localhost", "r");75 else76 f = popen("netperf -l 4 localhost", "r");77 (void) f;78 79 for (i = 0; i < 5; i++) {80 struct flow_key_record key = {}, next_key;81 struct pair value;82 83 sleep(1);84 printf("IP src.port -> dst.port bytes packets\n");85 while (bpf_map_get_next_key(hash_map_fd, &key, &next_key) == 0) {86 bpf_map_lookup_elem(hash_map_fd, &next_key, &value);87 printf("%s.%05d -> %s.%05d %12lld %12lld\n",88 inet_ntoa((struct in_addr){htonl(next_key.src)}),89 next_key.port16[0],90 inet_ntoa((struct in_addr){htonl(next_key.dst)}),91 next_key.port16[1],92 value.bytes, value.packets);93 key = next_key;94 }95 }96 97cleanup:98 bpf_object__close(obj);99 return 0;100}101