[linux.git] / kernel / bpf / prog_iter.c

// 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(btf_bpf_prog_id)
BTF_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);
Commit	Line	Data
a228a64f AS	1	// SPDX-License-Identifier: GPL-2.0-only
	2	/* Copyright (c) 2020 Facebook */
	3	#include <linux/bpf.h>
	4	#include <linux/fs.h>
	5	#include <linux/filter.h>
	6	#include <linux/kernel.h>
	7	#include <linux/btf_ids.h>
	8
	9	struct bpf_iter_seq_prog_info {
	10	u32 prog_id;
	11	};
	12
	13	static void bpf_prog_seq_start(struct seq_file seq, loff_t *pos)
	14	{
	15	struct bpf_iter_seq_prog_info *info = seq->private;
	16	struct bpf_prog *prog;
	17
	18	prog = bpf_prog_get_curr_or_next(&info->prog_id);
	19	if (!prog)
	20	return NULL;
	21
	22	if (*pos == 0)
	23	++*pos;
	24	return prog;
	25	}
	26
	27	static void bpf_prog_seq_next(struct seq_file seq, void v, loff_t pos)
	28	{
	29	struct bpf_iter_seq_prog_info *info = seq->private;
	30
	31	++*pos;
	32	++info->prog_id;
	33	bpf_prog_put((struct bpf_prog *)v);
	34	return bpf_prog_get_curr_or_next(&info->prog_id);
	35	}
	36
	37	struct bpf_iter__bpf_prog {
	38	__bpf_md_ptr(struct bpf_iter_meta *, meta);
	39	__bpf_md_ptr(struct bpf_prog *, prog);
	40	};
	41
	42	DEFINE_BPF_ITER_FUNC(bpf_prog, struct bpf_iter_meta meta, struct bpf_prog prog)
	43
	44	static int __bpf_prog_seq_show(struct seq_file seq, void v, bool in_stop)
	45	{
	46	struct bpf_iter__bpf_prog ctx;
	47	struct bpf_iter_meta meta;
	48	struct bpf_prog *prog;
	49	int ret = 0;
	50
	51	ctx.meta = &meta;
	52	ctx.prog = v;
	53	meta.seq = seq;
	54	prog = bpf_iter_get_info(&meta, in_stop);
	55	if (prog)
	56	ret = bpf_iter_run_prog(prog, &ctx);
	57
	58	return ret;
	59	}
	60
	61	static int bpf_prog_seq_show(struct seq_file seq, void v)
	62	{
	63	return __bpf_prog_seq_show(seq, v, false);
	64	}
65
66	static void bpf_prog_seq_stop(struct seq_file seq, void v)
67	{
68	if (!v)
69	(void)__bpf_prog_seq_show(seq, v, true);
70	else
71	bpf_prog_put((struct bpf_prog *)v);
72	}
73
74	static const struct seq_operations bpf_prog_seq_ops = {
75	.start = bpf_prog_seq_start,
76	.next = bpf_prog_seq_next,
77	.stop = bpf_prog_seq_stop,
78	.show = bpf_prog_seq_show,
79	};
80
81	BTF_ID_LIST(btf_bpf_prog_id)
82	BTF_ID(struct, bpf_prog)
83
14fc6bd6	84	static const struct bpf_iter_seq_info bpf_prog_seq_info = {
a228a64f AS	85	.seq_ops = &bpf_prog_seq_ops,
	86	.init_seq_private = NULL,
	87	.fini_seq_private = NULL,
	88	.seq_priv_size = sizeof(struct bpf_iter_seq_prog_info),
14fc6bd6 YS	89	};
	90
	91	static struct bpf_iter_reg bpf_prog_reg_info = {
	92	.target = "bpf_prog",
a228a64f AS	93	.ctx_arg_info_size = 1,
	94	.ctx_arg_info = {
	95	{ offsetof(struct bpf_iter__bpf_prog, prog),
	96	PTR_TO_BTF_ID_OR_NULL },
	97	},
14fc6bd6	98	.seq_info = &bpf_prog_seq_info,
a228a64f AS	99	};
	100
	101	static int __init bpf_prog_iter_init(void)
	102	{
	103	bpf_prog_reg_info.ctx_arg_info[0].btf_id = *btf_bpf_prog_id;
	104	return bpf_iter_reg_target(&bpf_prog_reg_info);
	105	}
	106
	107	late_initcall(bpf_prog_iter_init);