// 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);