// SPDX-License-Identifier: GPL-2.0-only/* Copyright (c) 2020 Facebook */#include <linux/bpf.h>#include <linux/fs.h>#include <linux/filter.h>#include <linux/kernel.h>#include <linux/btf_ids.h> struct bpf_iter_seq_prog_info {	u32 prog_id;}; static void *bpf_prog_seq_start(struct seq_file *seq, loff_t *pos){	struct bpf_iter_seq_prog_info *info = seq->private;	struct bpf_prog *prog; 	prog = bpf_prog_get_curr_or_next(&info->prog_id);	if (!prog)		return NULL; 	if (*pos == 0)		++*pos;	return prog;} static void *bpf_prog_seq_next(struct seq_file *seq, void *v, loff_t *pos){	struct bpf_iter_seq_prog_info *info = seq->private; 	++*pos;	++info->prog_id;	bpf_prog_put((struct bpf_prog *)v);	return bpf_prog_get_curr_or_next(&info->prog_id);} struct bpf_iter__bpf_prog {	__bpf_md_ptr(struct bpf_iter_meta *, meta);	__bpf_md_ptr(struct bpf_prog *, prog);}; DEFINE_BPF_ITER_FUNC(bpf_prog, struct bpf_iter_meta *meta, struct bpf_prog *prog) static int __bpf_prog_seq_show(struct seq_file *seq, void *v, bool in_stop){	struct bpf_iter__bpf_prog ctx;	struct bpf_iter_meta meta;	struct bpf_prog *prog;	int ret = 0; 	ctx.meta = &meta;	ctx.prog = v;	meta.seq = seq;	prog = bpf_iter_get_info(&meta, in_stop);	if (prog)		ret = bpf_iter_run_prog(prog, &ctx); 	return ret;} static int bpf_prog_seq_show(struct seq_file *seq, void *v){	return __bpf_prog_seq_show(seq, v, false);} static void bpf_prog_seq_stop(struct seq_file *seq, void *v){	if (!v)		(void)__bpf_prog_seq_show(seq, v, true);	else		bpf_prog_put((struct bpf_prog *)v);} static const struct seq_operations bpf_prog_seq_ops = {	.start	= bpf_prog_seq_start,	.next	= bpf_prog_seq_next,	.stop	= bpf_prog_seq_stop,	.show	= bpf_prog_seq_show,}; BTF_ID_LIST_SINGLE(btf_bpf_prog_id, struct, bpf_prog) static const struct bpf_iter_seq_info bpf_prog_seq_info = {	.seq_ops		= &bpf_prog_seq_ops,	.init_seq_private	= NULL,	.fini_seq_private	= NULL,	.seq_priv_size		= sizeof(struct bpf_iter_seq_prog_info),}; static struct bpf_iter_reg bpf_prog_reg_info = {	.target			= "bpf_prog",	.ctx_arg_info_size	= 1,	.ctx_arg_info		= {		{ offsetof(struct bpf_iter__bpf_prog, prog),		  PTR_TO_BTF_ID_OR_NULL },	},	.seq_info		= &bpf_prog_seq_info,}; static int __init bpf_prog_iter_init(void){	bpf_prog_reg_info.ctx_arg_info[0].btf_id = *btf_bpf_prog_id;	return bpf_iter_reg_target(&bpf_prog_reg_info);} late_initcall(bpf_prog_iter_init);