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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107// 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_SINGLE(btf_bpf_link_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);