bpf: btf: Add BPF_BTF_LOAD command
This patch adds a BPF_BTF_LOAD command which
1) loads and verifies the BTF (implemented in earlier patches)
2) returns a BTF fd to userspace. In the next patch, the
BTF fd can be specified during BPF_MAP_CREATE.
It currently limits to CAP_SYS_ADMIN.
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Alexei Starovoitov <ast@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
diff --git a/include/linux/btf.h b/include/linux/btf.h
index d8bdab0..a7c7072 100644
--- a/include/linux/btf.h
+++ b/include/linux/btf.h
@@ -8,7 +8,11 @@
struct btf;
struct btf_type;
+union bpf_attr;
+void btf_put(struct btf *btf);
+int btf_new_fd(const union bpf_attr *attr);
+struct btf *btf_get_by_fd(int fd);
/* Figure out the size of a type_id. If type_id is a modifier
* (e.g. const), it will be resolved to find out the type with size.
*
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 9a2d1a0..795bcd5 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -95,6 +95,7 @@ enum bpf_cmd {
BPF_OBJ_GET_INFO_BY_FD,
BPF_PROG_QUERY,
BPF_RAW_TRACEPOINT_OPEN,
+ BPF_BTF_LOAD,
};
enum bpf_map_type {
@@ -363,6 +364,14 @@ union bpf_attr {
__u64 name;
__u32 prog_fd;
} raw_tracepoint;
+
+ struct { /* anonymous struct for BPF_BTF_LOAD */
+ __aligned_u64 btf;
+ __aligned_u64 btf_log_buf;
+ __u32 btf_size;
+ __u32 btf_log_size;
+ __u32 btf_log_level;
+ };
} __attribute__((aligned(8)));
/* BPF helper function descriptions: