126 lines
2.9 KiB
C
126 lines
2.9 KiB
C
/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
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/* Copyright (c) 2021 Facebook */
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#ifndef __SKEL_INTERNAL_H
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#define __SKEL_INTERNAL_H
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#include <unistd.h>
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#include <sys/syscall.h>
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#include <sys/mman.h>
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/* This file is a base header for auto-generated *.lskel.h files.
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* Its contents will change and may become part of auto-generation in the future.
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*
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* The layout of bpf_[map|prog]_desc and bpf_loader_ctx is feature dependent
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* and will change from one version of libbpf to another and features
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* requested during loader program generation.
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*/
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struct bpf_map_desc {
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union {
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/* input for the loader prog */
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struct {
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__aligned_u64 initial_value;
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__u32 max_entries;
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};
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/* output of the loader prog */
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struct {
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int map_fd;
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};
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};
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};
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struct bpf_prog_desc {
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int prog_fd;
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};
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struct bpf_loader_ctx {
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size_t sz;
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__u32 log_level;
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__u32 log_size;
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__u64 log_buf;
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};
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struct bpf_load_and_run_opts {
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struct bpf_loader_ctx *ctx;
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const void *data;
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const void *insns;
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__u32 data_sz;
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__u32 insns_sz;
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const char *errstr;
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};
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static inline int skel_sys_bpf(enum bpf_cmd cmd, union bpf_attr *attr,
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unsigned int size)
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{
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return syscall(__NR_bpf, cmd, attr, size);
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}
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static inline int skel_closenz(int fd)
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{
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if (fd > 0)
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return close(fd);
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return -EINVAL;
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}
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static inline int bpf_load_and_run(struct bpf_load_and_run_opts *opts)
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{
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int map_fd = -1, prog_fd = -1, key = 0, err;
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union bpf_attr attr;
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map_fd = bpf_create_map_name(BPF_MAP_TYPE_ARRAY, "__loader.map", 4,
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opts->data_sz, 1, 0);
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if (map_fd < 0) {
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opts->errstr = "failed to create loader map";
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err = -errno;
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goto out;
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}
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err = bpf_map_update_elem(map_fd, &key, opts->data, 0);
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if (err < 0) {
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opts->errstr = "failed to update loader map";
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err = -errno;
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goto out;
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}
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memset(&attr, 0, sizeof(attr));
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attr.prog_type = BPF_PROG_TYPE_SYSCALL;
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attr.insns = (long) opts->insns;
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attr.insn_cnt = opts->insns_sz / sizeof(struct bpf_insn);
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attr.license = (long) "Dual BSD/GPL";
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memcpy(attr.prog_name, "__loader.prog", sizeof("__loader.prog"));
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attr.fd_array = (long) &map_fd;
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attr.log_level = opts->ctx->log_level;
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attr.log_size = opts->ctx->log_size;
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attr.log_buf = opts->ctx->log_buf;
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attr.prog_flags = BPF_F_SLEEPABLE;
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prog_fd = skel_sys_bpf(BPF_PROG_LOAD, &attr, sizeof(attr));
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if (prog_fd < 0) {
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opts->errstr = "failed to load loader prog";
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err = -errno;
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goto out;
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}
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memset(&attr, 0, sizeof(attr));
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attr.test.prog_fd = prog_fd;
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attr.test.ctx_in = (long) opts->ctx;
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attr.test.ctx_size_in = opts->ctx->sz;
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err = skel_sys_bpf(BPF_PROG_RUN, &attr, sizeof(attr));
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if (err < 0 || (int)attr.test.retval < 0) {
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opts->errstr = "failed to execute loader prog";
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if (err < 0) {
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err = -errno;
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} else {
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err = (int)attr.test.retval;
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errno = -err;
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}
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goto out;
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}
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err = 0;
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out:
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if (map_fd >= 0)
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close(map_fd);
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if (prog_fd >= 0)
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close(prog_fd);
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return err;
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}
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#endif
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