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