tree 4c9199cde0fe876871e20352666d40721d4c1d5f
parent 12028820423bd7705beb5e09889faab95c545ea1
author Daniel Borkmann <daniel@iogearbox.net> 1426296436 +0100
committer David S. Miller <davem@davemloft.net> 1426471045 -0400

ebpf: add prandom helper for packet sampling

This work is similar to commit 4cd3675ebf74 ("filter: added BPF
random opcode") and adds a possibility for packet sampling in eBPF.

Currently, this is only possible in classic BPF and useful to
combine sampling with f.e. packet sockets, possible also with tc.

Example function proto-type looks like:

  u32 (*prandom_u32)(void) = (void *)BPF_FUNC_get_prandom_u32;

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>