From: Alexei Starovoitov <ast@plumgrid.com>
Date: Fri, 26 Sep 2014 07:17:01 +0000 (-0700)
Subject: bpf: handle pseudo BPF_CALL insn
X-Git-Tag: fixes-against-v3.18-rc2~81^2~1^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0a542a86d73b1577e7d4f55fc95dcffd3fe62643;p=pandora-kernel.git

bpf: handle pseudo BPF_CALL insn

in native eBPF programs userspace is using pseudo BPF_CALL instructions
which encode one of 'enum bpf_func_id' inside insn->imm field.
Verifier checks that program using correct function arguments to given func_id.
If all checks passed, kernel needs to fixup BPF_CALL->imm fields by
replacing func_id with in-kernel function pointer.
eBPF interpreter just calls the function.

In-kernel eBPF users continue to use generic BPF_CALL.

Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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