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bpf: Add hardware timestamp field to __sk_buff

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BPF programs may want to know hardware timestamps if NIC supports
such timestamping.

Expose this data as hwtstamp field of __sk_buff the same way as
gso_segs/gso_size. This field could be accessed from the same
programs as tstamp field, but it's read-only field. Explicit test
to deny access to padding data is added to bpf_skb_is_valid_access.

Also update BPF_PROG_TEST_RUN tests of the feature.

Signed-off-by: Vadim Fedorenko <vfedorenko@novek.ru>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20210909220409.8804-2-vfedorenko@novek.ru
This commit is contained in:
Vadim Fedorenko
2021-09-10 01:04:08 +03:00
committed by Daniel Borkmann
parent e876a0367c
commit f64c4acea5
3 changed files with 25 additions and 0 deletions
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2
include/uapi/linux/bpf.h
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@@ -5284,6 +5284,8 @@ struct __sk_buff {
__u32 gso_segs;
__bpf_md_ptr(struct bpf_sock *, sk);
__u32 gso_size;
__u32 :32; /* Padding, future use. */
__u64 hwtstamp;
};
struct bpf_tunnel_key {