tree 6988d7dc3352fbcce10c5c510ffa11e6f30217de
parent 5a4ae5f6e7d4b2b5a9b8981d513345053e40b6ac
author Chema Gonzalez <chema@google.com> 1398097284 -0700
committer David S. Miller <davem@davemloft.net> 1398216477 -0400

filter: added BPF random opcode

Added a new ancillary load (bpf call in eBPF parlance) that produces
a 32-bit random number. We are implementing it as an ancillary load
(instead of an ISA opcode) because (a) it is simpler, (b) allows easy
JITing, and (c) seems more in line with generic ISAs that do not have
"get a random number" as a instruction, but as an OS call.

The main use for this ancillary load is to perform random packet sampling.

Signed-off-by: Chema Gonzalez <chema@google.com>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Acked-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>