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netfilter: meta: add PRANDOM support

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Can be used to randomly match packets e.g. for statistic traffic sampling.

See commit 3ad0040573
("bpf: split state from prandom_u32() and consolidate {c, e}BPF prngs")
for more info why this doesn't use prandom_u32 directly.

Unlike bpf nft_meta can be built as a module, so add an EXPORT_SYMBOL
for prandom_seed_full_state too.

Cc: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2016-02-16 17:24:08 +01:00 • committed by Pablo Neira Ayuso
parent f12d33f4d8
commit b07edbe1cf
3 changed files with 14 additions and 0 deletions
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1
lib/random32.c
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@ -255,6 +255,7 @@ void prandom_seed_full_state(struct rnd_state __percpu *pcpu_state)
prandom_warmup(state);
}
}
EXPORT_SYMBOL(prandom_seed_full_state);
/*
* Generate better values after random number generator