bpf: Simplify insn rewrite on BPF_WRITE __sk_buff->tstamp

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BPF_JMP32_IMM(BPF_JSET) is used to save a BPF_ALU32_IMM(BPF_AND).

The skb->tc_at_ingress and skb->mono_delivery_time are at the same
offset, so only one BPF_LDX_MEM(BPF_B) is needed.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220309090502.3711982-1-kafai@fb.com

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Martin KaFai Lau 2022-03-09 01:05:02 -08:00 • committed by Daniel Borkmann

parent 539de9328e

commit 9d90db97e4

1 changed files with 14 additions and 12 deletions

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26

net/core/filter.c

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