cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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test_cgrp2_sock2.c (2009B)

      1// SPDX-License-Identifier: GPL-2.0
      2/* eBPF example program:
      3 *
      4 * - Loads eBPF program
      5 *
      6 *   The eBPF program loads a filter from file and attaches the
      7 *   program to a cgroup using BPF_PROG_ATTACH
      8 */
      9
     10#define _GNU_SOURCE
     11
     12#include <stdio.h>
     13#include <stdlib.h>
     14#include <stddef.h>
     15#include <string.h>
     16#include <unistd.h>
     17#include <assert.h>
     18#include <errno.h>
     19#include <fcntl.h>
     20#include <net/if.h>
     21#include <linux/bpf.h>
     22#include <bpf/bpf.h>
     23#include <bpf/libbpf.h>
     24
     25#include "bpf_insn.h"
     26
     27static int usage(const char *argv0)
     28{
     29	printf("Usage: %s cg-path filter-path [filter-id]\n", argv0);
     30	return EXIT_FAILURE;
     31}
     32
     33int main(int argc, char **argv)
     34{
     35	int cg_fd, err, ret = EXIT_FAILURE, filter_id = 0, prog_cnt = 0;
     36	const char *link_pin_path = "/sys/fs/bpf/test_cgrp2_sock2";
     37	struct bpf_link *link = NULL;
     38	struct bpf_program *progs[2];
     39	struct bpf_program *prog;
     40	struct bpf_object *obj;
     41
     42	if (argc < 3)
     43		return usage(argv[0]);
     44
     45	if (argc > 3)
     46		filter_id = atoi(argv[3]);
     47
     48	cg_fd = open(argv[1], O_DIRECTORY | O_RDONLY);
     49	if (cg_fd < 0) {
     50		printf("Failed to open cgroup path: '%s'\n", strerror(errno));
     51		return ret;
     52	}
     53
     54	obj = bpf_object__open_file(argv[2], NULL);
     55	if (libbpf_get_error(obj)) {
     56		printf("ERROR: opening BPF object file failed\n");
     57		return ret;
     58	}
     59
     60	bpf_object__for_each_program(prog, obj) {
     61		progs[prog_cnt] = prog;
     62		prog_cnt++;
     63	}
     64
     65	if (filter_id >= prog_cnt) {
     66		printf("Invalid program id; program not found in file\n");
     67		goto cleanup;
     68	}
     69
     70	/* load BPF program */
     71	if (bpf_object__load(obj)) {
     72		printf("ERROR: loading BPF object file failed\n");
     73		goto cleanup;
     74	}
     75
     76	link = bpf_program__attach_cgroup(progs[filter_id], cg_fd);
     77	if (libbpf_get_error(link)) {
     78		printf("ERROR: bpf_program__attach failed\n");
     79		link = NULL;
     80		goto cleanup;
     81	}
     82
     83	err = bpf_link__pin(link, link_pin_path);
     84	if (err < 0) {
     85		printf("ERROR: bpf_link__pin failed: %d\n", err);
     86		goto cleanup;
     87	}
     88
     89	ret = EXIT_SUCCESS;
     90
     91cleanup:
     92	bpf_link__destroy(link);
     93	bpf_object__close(obj);
     94	return ret;
     95}