diff options
Diffstat (limited to '')
-rw-r--r-- | kernel/bpf/prog_iter.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/kernel/bpf/prog_iter.c b/kernel/bpf/prog_iter.c new file mode 100644 index 000000000..53a73c841 --- /dev/null +++ b/kernel/bpf/prog_iter.c @@ -0,0 +1,107 @@ +// 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); |