cregit-Linux how code gets into the kernel

Release 4.10 samples/bpf/test_cgrp2_sock2.c

Directory: samples/bpf
/* eBPF example program:
 * - Loads eBPF program
 *   The eBPF program loads a filter from file and attaches the
 *   program to a cgroup using BPF_PROG_ATTACH

#define _GNU_SOURCE

#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <unistd.h>
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <net/if.h>
#include <linux/bpf.h>

#include "libbpf.h"
#include "bpf_load.h"

static int usage(const char *argv0) { printf("Usage: %s cg-path filter-path [filter-id]\n", argv0); return EXIT_FAILURE; }


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int main(int argc, char **argv) { int cg_fd, ret, filter_id = 0; if (argc < 3) return usage(argv[0]); cg_fd = open(argv[1], O_DIRECTORY | O_RDONLY); if (cg_fd < 0) { printf("Failed to open cgroup path: '%s'\n", strerror(errno)); return EXIT_FAILURE; } if (load_bpf_file(argv[2])) return EXIT_FAILURE; printf("Output from kernel verifier:\n%s\n-------\n", bpf_log_buf); if (argc > 3) filter_id = atoi(argv[3]); if (filter_id > prog_cnt) { printf("Invalid program id; program not found in file\n"); return EXIT_FAILURE; } ret = bpf_prog_attach(prog_fd[filter_id], cg_fd, BPF_CGROUP_INET_SOCK_CREATE, 0); if (ret < 0) { printf("Failed to attach prog to cgroup: '%s'\n", strerror(errno)); return EXIT_FAILURE; } return EXIT_SUCCESS; }


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Directory: samples/bpf
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