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95 lines
2.0 KiB
95 lines
2.0 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* eBPF example program: |
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* |
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* - Loads eBPF program |
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* |
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* The eBPF program loads a filter from file and attaches the |
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* program to a cgroup using BPF_PROG_ATTACH |
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*/ |
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#define _GNU_SOURCE |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <stddef.h> |
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#include <string.h> |
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#include <unistd.h> |
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#include <assert.h> |
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#include <errno.h> |
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#include <fcntl.h> |
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#include <net/if.h> |
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#include <linux/bpf.h> |
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#include <bpf/bpf.h> |
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#include <bpf/libbpf.h> |
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#include "bpf_insn.h" |
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static int usage(const char *argv0) |
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{ |
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printf("Usage: %s cg-path filter-path [filter-id]\n", argv0); |
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return EXIT_FAILURE; |
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} |
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int main(int argc, char **argv) |
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{ |
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int cg_fd, err, ret = EXIT_FAILURE, filter_id = 0, prog_cnt = 0; |
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const char *link_pin_path = "/sys/fs/bpf/test_cgrp2_sock2"; |
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struct bpf_link *link = NULL; |
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struct bpf_program *progs[2]; |
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struct bpf_program *prog; |
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struct bpf_object *obj; |
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if (argc < 3) |
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return usage(argv[0]); |
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if (argc > 3) |
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filter_id = atoi(argv[3]); |
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cg_fd = open(argv[1], O_DIRECTORY | O_RDONLY); |
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if (cg_fd < 0) { |
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printf("Failed to open cgroup path: '%s'\n", strerror(errno)); |
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return ret; |
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} |
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obj = bpf_object__open_file(argv[2], NULL); |
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if (libbpf_get_error(obj)) { |
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printf("ERROR: opening BPF object file failed\n"); |
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return ret; |
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} |
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bpf_object__for_each_program(prog, obj) { |
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progs[prog_cnt] = prog; |
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prog_cnt++; |
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} |
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if (filter_id >= prog_cnt) { |
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printf("Invalid program id; program not found in file\n"); |
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goto cleanup; |
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} |
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/* load BPF program */ |
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if (bpf_object__load(obj)) { |
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printf("ERROR: loading BPF object file failed\n"); |
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goto cleanup; |
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} |
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link = bpf_program__attach_cgroup(progs[filter_id], cg_fd); |
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if (libbpf_get_error(link)) { |
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printf("ERROR: bpf_program__attach failed\n"); |
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link = NULL; |
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goto cleanup; |
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} |
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err = bpf_link__pin(link, link_pin_path); |
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if (err < 0) { |
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printf("ERROR: bpf_link__pin failed: %d\n", err); |
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goto cleanup; |
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} |
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ret = EXIT_SUCCESS; |
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cleanup: |
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bpf_link__destroy(link); |
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bpf_object__close(obj); |
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return ret; |
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}
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