diff options
| author | Florent Revest <revest@chromium.org> | 2020-12-04 12:36:05 +0100 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2020-12-04 22:32:40 +0100 |
| commit | 4f19cab76136e800a3f04d8c9aa4d8e770e3d3d8 (patch) | |
| tree | 3b5e5f07da31f2a2a81b858765e00c8ff0265daa /tools | |
| parent | net: Remove the err argument from sock_from_file (diff) | |
| download | linux-4f19cab76136e800a3f04d8c9aa4d8e770e3d3d8.tar.xz linux-4f19cab76136e800a3f04d8c9aa4d8e770e3d3d8.zip | |
bpf: Add a bpf_sock_from_file helper
While eBPF programs can check whether a file is a socket by file->f_op
== &socket_file_ops, they cannot convert the void private_data pointer
to a struct socket BTF pointer. In order to do this a new helper
wrapping sock_from_file is added.
This is useful to tracing programs but also other program types
inheriting this set of helpers such as iterators or LSM programs.
Signed-off-by: Florent Revest <revest@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: KP Singh <kpsingh@google.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20201204113609.1850150-2-revest@google.com
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/include/uapi/linux/bpf.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index 1233f14f659f..30b477a26482 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -3822,6 +3822,14 @@ union bpf_attr { * The **hash_algo** is returned on success, * **-EOPNOTSUP** if IMA is disabled or **-EINVAL** if * invalid arguments are passed. + * + * struct socket *bpf_sock_from_file(struct file *file) + * Description + * If the given file represents a socket, returns the associated + * socket. + * Return + * A pointer to a struct socket on success or NULL if the file is + * not a socket. */ #define __BPF_FUNC_MAPPER(FN) \ FN(unspec), \ @@ -3986,6 +3994,7 @@ union bpf_attr { FN(bprm_opts_set), \ FN(ktime_get_coarse_ns), \ FN(ima_inode_hash), \ + FN(sock_from_file), \ /* */ /* integer value in 'imm' field of BPF_CALL instruction selects which helper |