Re: Embedding pcap filters in C

Yonghong Song

On Sat, Aug 19, 2017 at 3:44 AM, Adrian Moreno via iovisor-dev
<iovisor-dev@...> wrote:
Hi all,

I'm playing around with bcc (which I find awesome, by the way) and I'm
trying to embed a pcap filter inside another BPF program so that I can have
the user-friendlyness of tcpdump-like expressions and the coolness of
BPF-maps, for example.

Is that possible without going down into LLVM or writing BPF code directly?
Can someone give me a hit?
you may have to do that for an arbitrary filter. Maybe bpf code is
simpler, there are some examples
in how translating a simple spec to a bpf program.

I tried to inline the pcap-filter in a C program using __asm__() but LLVM
fails with: "LLVM ERROR: Inline asm not supported by this streamer because
we don't have an asm parser for this target"
inline assembler is not supported for bpf backend.

Thanks very much in advance.

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