159 строки
3.4 KiB
C
159 строки
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
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/*
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* ibumad BPF sample user side
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* Copyright(c) 2018 Ira Weiny, Intel Corporation
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*/
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#include <linux/bpf.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <limits.h>
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#include <getopt.h>
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#include <net/if.h>
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#include <bpf/bpf.h>
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#include "bpf_util.h"
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#include <bpf/libbpf.h>
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static struct bpf_link *tp_links[3];
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static struct bpf_object *obj;
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static int map_fd[2];
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static int tp_cnt;
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static void dump_counts(int fd)
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{
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__u32 key;
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__u64 value;
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for (key = 0; key < 256; key++) {
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if (bpf_map_lookup_elem(fd, &key, &value)) {
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printf("failed to read key %u\n", key);
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continue;
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}
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if (value)
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printf("0x%02x : %llu\n", key, value);
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}
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}
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static void dump_all_counts(void)
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{
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printf("Read 'Class : count'\n");
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dump_counts(map_fd[0]);
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printf("Write 'Class : count'\n");
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dump_counts(map_fd[1]);
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}
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static void dump_exit(int sig)
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{
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dump_all_counts();
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/* Detach tracepoints */
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while (tp_cnt)
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bpf_link__destroy(tp_links[--tp_cnt]);
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bpf_object__close(obj);
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exit(0);
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}
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static const struct option long_options[] = {
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{"help", no_argument, NULL, 'h'},
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{"delay", required_argument, NULL, 'd'},
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};
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static void usage(char *cmd)
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{
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printf("eBPF test program to count packets from various IP addresses\n"
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"Usage: %s <options>\n"
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" --help, -h this menu\n"
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" --delay, -d <delay> wait <delay> sec between prints [1 - 1000000]\n"
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, cmd
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);
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}
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int main(int argc, char **argv)
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{
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struct bpf_program *prog;
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unsigned long delay = 5;
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char filename[256];
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int longindex = 0;
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int opt, err = -1;
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while ((opt = getopt_long(argc, argv, "hd:rSw",
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long_options, &longindex)) != -1) {
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switch (opt) {
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case 'd':
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delay = strtoul(optarg, NULL, 0);
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if (delay == ULONG_MAX || delay < 0 ||
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delay > 1000000) {
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fprintf(stderr, "ERROR: invalid delay : %s\n",
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optarg);
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usage(argv[0]);
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return 1;
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}
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break;
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default:
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case 'h':
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usage(argv[0]);
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return 1;
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}
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}
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/* Do one final dump when exiting */
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signal(SIGINT, dump_exit);
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signal(SIGTERM, dump_exit);
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snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
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obj = bpf_object__open_file(filename, NULL);
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if (libbpf_get_error(obj)) {
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fprintf(stderr, "ERROR: opening BPF object file failed\n");
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return err;
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}
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/* load BPF program */
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if (bpf_object__load(obj)) {
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fprintf(stderr, "ERROR: loading BPF object file failed\n");
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goto cleanup;
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}
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map_fd[0] = bpf_object__find_map_fd_by_name(obj, "read_count");
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map_fd[1] = bpf_object__find_map_fd_by_name(obj, "write_count");
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if (map_fd[0] < 0 || map_fd[1] < 0) {
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fprintf(stderr, "ERROR: finding a map in obj file failed\n");
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goto cleanup;
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}
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bpf_object__for_each_program(prog, obj) {
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tp_links[tp_cnt] = bpf_program__attach(prog);
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if (libbpf_get_error(tp_links[tp_cnt])) {
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fprintf(stderr, "ERROR: bpf_program__attach failed\n");
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tp_links[tp_cnt] = NULL;
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goto cleanup;
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}
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tp_cnt++;
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}
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while (1) {
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sleep(delay);
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dump_all_counts();
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}
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err = 0;
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cleanup:
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/* Detach tracepoints */
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while (tp_cnt)
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bpf_link__destroy(tp_links[--tp_cnt]);
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bpf_object__close(obj);
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return err;
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}
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