| 1 | |
| 2 |
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| 3 | #include <linux/bpf.h>
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| 4 | #include <linux/fs.h>
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| 5 | #include <linux/filter.h>
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| 6 | #include <linux/kernel.h>
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| 7 | #include <linux/btf_ids.h>
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| 8 |
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| 9 | struct bpf_iter_seq_prog_info {
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| 10 | u32 prog_id;
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| 11 | };
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| 12 |
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| 13 | static void *bpf_prog_seq_start(struct seq_file *seq, loff_t *pos)
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| 14 | {
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| 15 | struct bpf_iter_seq_prog_info *info = seq->private;
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| 16 | struct bpf_prog *prog;
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| 17 |
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| 18 | prog = bpf_prog_get_curr_or_next(&info->prog_id);
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| 19 | if (!prog)
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| 20 | return NULL;
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| 21 |
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| 22 | if (*pos == 0)
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| 23 | ++*pos;
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| 24 | return prog;
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| 25 | }
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| 26 |
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| 27 | static void *bpf_prog_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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| 28 | {
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| 29 | struct bpf_iter_seq_prog_info *info = seq->private;
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| 30 |
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| 31 | ++*pos;
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| 32 | ++info->prog_id;
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| 33 | bpf_prog_put((struct bpf_prog *)v);
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| 34 | return bpf_prog_get_curr_or_next(&info->prog_id);
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| 35 | }
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| 36 |
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| 37 | struct bpf_iter__bpf_prog {
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| 38 | __bpf_md_ptr(struct bpf_iter_meta *, meta);
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| 39 | __bpf_md_ptr(struct bpf_prog *, prog);
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| 40 | };
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| 41 |
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| 42 | DEFINE_BPF_ITER_FUNC(bpf_prog, struct bpf_iter_meta *meta, struct bpf_prog *prog)
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| 43 |
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| 44 | static int __bpf_prog_seq_show(struct seq_file *seq, void *v, bool in_stop)
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| 45 | {
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| 46 | struct bpf_iter__bpf_prog ctx;
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| 47 | struct bpf_iter_meta meta;
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| 48 | struct bpf_prog *prog;
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| 49 | int ret = 0;
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| 50 |
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| 51 | ctx.meta = &meta;
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| 52 | ctx.prog = v;
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| 53 | meta.seq = seq;
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| 54 | prog = bpf_iter_get_info(&meta, in_stop);
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| 55 | if (prog)
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| 56 | ret = bpf_iter_run_prog(prog, &ctx);
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| 57 |
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| 58 | return ret;
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| 59 | }
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| 60 |
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| 61 | static int bpf_prog_seq_show(struct seq_file *seq, void *v)
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| 62 | {
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| 63 | return __bpf_prog_seq_show(seq, v, false);
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| 64 | }
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| 65 |
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| 66 | static void bpf_prog_seq_stop(struct seq_file *seq, void *v)
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| 67 | {
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| 68 | if (!v)
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| 69 | (void)__bpf_prog_seq_show(seq, v, true);
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| 70 | else
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| 71 | bpf_prog_put((struct bpf_prog *)v);
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| 72 | }
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| 73 |
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| 74 | static const struct seq_operations bpf_prog_seq_ops = {
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| 75 | .start = bpf_prog_seq_start,
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| 76 | .next = bpf_prog_seq_next,
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| 77 | .stop = bpf_prog_seq_stop,
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| 78 | .show = bpf_prog_seq_show,
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| 79 | };
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| 80 |
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| 81 | BTF_ID_LIST_SINGLE(btf_bpf_prog_id, struct, bpf_prog)
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| 82 |
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| 83 | static const struct bpf_iter_seq_info bpf_prog_seq_info = {
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| 84 | .seq_ops = &bpf_prog_seq_ops,
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| 85 | .init_seq_private = NULL,
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| 86 | .fini_seq_private = NULL,
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| 87 | .seq_priv_size = sizeof(struct bpf_iter_seq_prog_info),
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| 88 | };
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| 89 |
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| 90 | static struct bpf_iter_reg bpf_prog_reg_info = {
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| 91 | .target = "bpf_prog",
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| 92 | .ctx_arg_info_size = 1,
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| 93 | .ctx_arg_info = {
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| 94 | { offsetof(struct bpf_iter__bpf_prog, prog),
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| 95 | PTR_TO_BTF_ID_OR_NULL },
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| 96 | },
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| 97 | .seq_info = &bpf_prog_seq_info,
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| 98 | };
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| 99 |
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| 100 | static int __init bpf_prog_iter_init(void)
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| 101 | {
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| 102 | bpf_prog_reg_info.ctx_arg_info[0].btf_id = *btf_bpf_prog_id;
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| 103 | return bpf_iter_reg_target(&bpf_prog_reg_info);
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| 104 | }
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| 105 |
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| 106 | late_initcall(bpf_prog_iter_init);
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