bpf: Disable unsafe helpers in TX timestamping callbacks

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New TX timestamping sock_ops callbacks will be added in the
subsequent patch. Some of the existing BPF helpers will not
be safe to be used in the TX timestamping callbacks.

The bpf_sock_ops_setsockopt, bpf_sock_ops_getsockopt, and
bpf_sock_ops_cb_flags_set require owning the sock lock. TX
timestamping callbacks will not own the lock.

The bpf_sock_ops_load_hdr_opt needs the skb->data pointing
to the TCP header. This will not be true in the TX timestamping
callbacks.

At the beginning of these helpers, this patch checks the
bpf_sock->op to ensure these helpers are used by the existing
sock_ops callbacks only.

Signed-off-by: Jason Xing <kerneljasonxing@gmail.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://patch.msgid.link/20250220072940.99994-5-kerneljasonxing@gmail.com

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Jason Xing 2025-02-20 15:29:32 +08:00 • committed by Martin KaFai Lau

parent fd93eaffb3

commit 2958624b25

1 changed files with 17 additions and 0 deletions

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net/core/filter.c

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