[PATCH bpf-next v2 01/10] bpf: btf: Make some of the API visible outside BTF
From: KP Singh <hidden>
Date: 2020-01-15 17:14:08
Also in:
bpf, lkml
Subsystem:
bpf [btf], bpf [general] (safe dynamic programs and tools), the rest · Maintainers:
Martin KaFai Lau, Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Linus Torvalds
From: KP Singh <redacted> - Add an extern for btf_vmlinux in btf.h - Add btf_type_by_name_kind, the LSM code does the combination of btf_find_by_name_kind and btf_type_by_id quite often. Signed-off-by: KP Singh <redacted> --- include/linux/btf.h | 8 ++++++++ kernel/bpf/btf.c | 17 +++++++++++++++++ 2 files changed, 25 insertions(+)
diff --git a/include/linux/btf.h b/include/linux/btf.h
index 881e9b76ef49..dc650d294bc4 100644
--- a/include/linux/btf.h
+++ b/include/linux/btf.h@@ -15,6 +15,7 @@ struct btf_type; union bpf_attr; extern const struct file_operations btf_fops; +extern struct btf *btf_vmlinux; void btf_put(struct btf *btf); int btf_new_fd(const union bpf_attr *attr);
@@ -66,6 +67,8 @@ const struct btf_type * btf_resolve_size(const struct btf *btf, const struct btf_type *type, u32 *type_size, const struct btf_type **elem_type, u32 *total_nelems); +const struct btf_type *btf_type_by_name_kind( + struct btf *btf, const char *name, u8 kind); #define for_each_member(i, struct_type, member) \ for (i = 0, member = btf_type_member(struct_type); \
@@ -142,6 +145,11 @@ static inline const struct btf_type *btf_type_by_id(const struct btf *btf, { return NULL; } +static inline const struct btf_type *btf_type_by_name_kind( + struct btf *btf, const char *name, u8 kind) +{ + return ERR_PTR(-EOPNOTSUPP); +} static inline const char *btf_name_by_offset(const struct btf *btf, u32 offset) {
diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index 832b5d7fd892..b8968cec8718 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c@@ -436,6 +436,23 @@ const struct btf_type *btf_type_resolve_func_ptr(const struct btf *btf, return NULL; } +const struct btf_type *btf_type_by_name_kind( + struct btf *btf, const char *name, u8 kind) +{ + const struct btf_type *t; + s32 type_id; + + type_id = btf_find_by_name_kind(btf, name, kind); + if (type_id < 0) + return ERR_PTR(-EINVAL); + + t = btf_type_by_id(btf, type_id); + if (!t) + return ERR_PTR(-EINVAL); + + return t; +} + /* Types that act only as a source, not sink or intermediate * type when resolving. */
--
2.20.1