Greetings,
I'm having difficulty with bpfc when using the mod and xor instructions. These
instructions compile fine, but trying to load them gives the error message:
Cannot attach filter to socket!
Here's a simple example (which doesn't do anything useful) to demonstrate the
issue:
ldh [12]
mod #8
jeq #0,Keep,Drop
Keep: ret #0xffffffff ; Return full packet
Drop: ret #0 ; Discard packet
which produces:
{ 0x28, 0, 0, 0x0000000c },
{ 0x94, 0, 0, 0x00000008 },
{ 0x15, 0, 1, 0x00000000 },
{ 0x6, 0, 0, 0xffffffff },
{ 0x6, 0, 0, 0x00000000 },
When run with 'netsniff-ng -i <ethN> -f <bpfc output file>, it produces the
error above. Other operation instructions work fine, although I haven't tried
them all.
Thanks,
John
PS I've tried to post this question from
https://groups.google.com/forum/?fromgroups#!forum/netsniff-ng twice, but my
post hasn't show up, so I'm trying to email it instead. My apologies if this
same question shows up a few more times in the forum.
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