On 09/03/2013 10:52 PM, Daniel Borkmann wrote:
On 09/03/2013 09:58 PM, Vladimir Murzin wrote:
[...]
Do you have a test case/suite by any chance ?
Ben.
Hi Ben!
Thanks for your feedback.
This patch is only compile tested. I have no real hardware, but I'll
probably bring up qemu ppc64 till end of the week...
Meanwhile, I've made simple how-to for testing. You can use it if you wish.
It is mainly based on the [1] and rechecked on x86-64.
Please also cc netdev on BPF related changes.
Actually, your test plan can be further simplified ...
For retrieving and disassembling the JIT image, we have bpf_jit_disasm [1].
1) echo 2 > /proc/sys/net/core/bpf_jit_enable
2) ... attach filter ...
3) bpf_jit_disasm -o
For generating a simple stupid test filter, you can use bpfc [2] (also
see its man page). E.g. ...
# cat blub
ldi #10
mod #8
ret a
# bpfc blub
{ 0x0, 0, 0, 0x0000000a },
{ 0x94, 0, 0, 0x00000008 },
{ 0x16, 0, 0, 0x00000000 },
Plus something like ...
ldxi #0
mod x
ret a
For longer-term testing, also trinity has BPF support. ;)
And load this array e.g. either into a small C program that attaches this
as BPF filter, or simply do bpfc blub > blub2 and run netsniff-ng -f blub2\
-s -i eth0, that should also do it.
Then, when attached, the kernel should truncate incoming frames for pf_packet
into max length of 2, just as an example.
[1] kernel tree, tools/net/bpf_jit_disasm.c
[2] git clone git://github.com/borkmann/netsniff-ng.git
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