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// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2022 Red Hat, Inc. */
#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_link_info {
u32 link_id;
};
static void *bpf_link_seq_start(struct seq_file *seq, loff_t *pos)
{
struct bpf_iter_seq_link_info *info = seq->private;
struct bpf_link *link;
link = bpf_link_get_curr_or_next(&info->link_id);
if (!link)
return NULL;
if (*pos == 0)
++*pos;
return link;
}
static void *bpf_link_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
struct bpf_iter_seq_link_info *info = seq->private;
++*pos;
++info->link_id;
bpf_link_put((struct bpf_link *)v);
return bpf_link_get_curr_or_next(&info->link_id);
}
struct bpf_iter__bpf_link {
__bpf_md_ptr(struct bpf_iter_meta *, meta);
__bpf_md_ptr(struct bpf_link *, link);
};
DEFINE_BPF_ITER_FUNC(bpf_link, struct bpf_iter_meta *meta, struct bpf_link *link)
static int __bpf_link_seq_show(struct seq_file *seq, void *v, bool in_stop)
{
struct bpf_iter__bpf_link ctx;
struct bpf_iter_meta meta;
struct bpf_prog *prog;
int ret = 0;
ctx.meta = &meta;
ctx.link = 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_link_seq_show(struct seq_file *seq, void *v)
{
return __bpf_link_seq_show(seq, v, false);
}
static void bpf_link_seq_stop(struct seq_file *seq, void *v)
{
if (!v)
(void)__bpf_link_seq_show(seq, v, true);
else
bpf_link_put((struct bpf_link *)v);
}
static const struct seq_operations bpf_link_seq_ops = {
.start = bpf_link_seq_start,
.next = bpf_link_seq_next,
.stop = bpf_link_seq_stop,
.show = bpf_link_seq_show,
};
BTF_ID_LIST(btf_bpf_link_id)
BTF_ID(struct, bpf_link)
static const struct bpf_iter_seq_info bpf_link_seq_info = {
.seq_ops = &bpf_link_seq_ops,
.init_seq_private = NULL,
.fini_seq_private = NULL,
.seq_priv_size = sizeof(struct bpf_iter_seq_link_info),
};
static struct bpf_iter_reg bpf_link_reg_info = {
.target = "bpf_link",
.ctx_arg_info_size = 1,
.ctx_arg_info = {
{ offsetof(struct bpf_iter__bpf_link, link),
PTR_TO_BTF_ID_OR_NULL },
},
.seq_info = &bpf_link_seq_info,
};
static int __init bpf_link_iter_init(void)
{
bpf_link_reg_info.ctx_arg_info[0].btf_id = *btf_bpf_link_id;
return bpf_iter_reg_target(&bpf_link_reg_info);
}
late_initcall(bpf_link_iter_init);
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