diff options
| author | Yonghong Song <yhs@fb.com> | 2022-11-20 11:54:32 -0800 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2022-11-20 15:43:37 -0800 |
| commit | fd264ca020948a743e4c36731dfdecc4a812153c (patch) | |
| tree | 9a615b76021a3dcebdd178438bab629077e14962 /include/linux/btf.h | |
| parent | cfe1456440c8feaf6558577a400745d774418379 (diff) | |
bpf: Add a kfunc to type cast from bpf uapi ctx to kernel ctx
Implement bpf_cast_to_kern_ctx() kfunc which does a type cast
of a uapi ctx object to the corresponding kernel ctx. Previously
if users want to access some data available in kctx but not
in uapi ctx, bpf_probe_read_kernel() helper is needed.
The introduction of bpf_cast_to_kern_ctx() allows direct
memory access which makes code simpler and easier to understand.
Signed-off-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/r/20221120195432.3113982-1-yhs@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'include/linux/btf.h')
| -rw-r--r-- | include/linux/btf.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/btf.h b/include/linux/btf.h index d38aa4251c28..9ed00077db6e 100644 --- a/include/linux/btf.h +++ b/include/linux/btf.h @@ -487,6 +487,7 @@ const struct btf_member * btf_get_prog_ctx_type(struct bpf_verifier_log *log, const struct btf *btf, const struct btf_type *t, enum bpf_prog_type prog_type, int arg); +int get_kern_ctx_btf_id(struct bpf_verifier_log *log, enum bpf_prog_type prog_type); bool btf_types_are_same(const struct btf *btf1, u32 id1, const struct btf *btf2, u32 id2); #else @@ -531,6 +532,10 @@ btf_get_prog_ctx_type(struct bpf_verifier_log *log, const struct btf *btf, { return NULL; } +static inline int get_kern_ctx_btf_id(struct bpf_verifier_log *log, + enum bpf_prog_type prog_type) { + return -EINVAL; +} static inline bool btf_types_are_same(const struct btf *btf1, u32 id1, const struct btf *btf2, u32 id2) { |