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bpf: Add a bpf_sock_from_file helper

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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
This commit is contained in:
Florent Revest 2020-12-04 12:36:05 +01:00 • committed by Daniel Borkmann
parent dba4a9256b
commit 4f19cab761
4 changed files with 42 additions and 0 deletions
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4
scripts/bpf_helpers_doc.py
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@ -437,6 +437,8 @@ class PrinterHelpers(Printer):
'struct path',
'struct btf_ptr',
'struct inode',
'struct socket',
'struct file',
]
known_types = {
'...',
@ -482,6 +484,8 @@ class PrinterHelpers(Printer):
'struct path',
'struct btf_ptr',
'struct inode',
'struct socket',
'struct file',
}
mapped_types = {
'u8': '__u8',