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netfilter: nft_meta: place prandom handling in a helper

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Move this out of the main eval loop, the numgen expression
provides a better alternative to meta random.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2019-12-18 12:05:19 +01:00 committed by Pablo Neira Ayuso
parent 8724e819cc
commit 6b2faee0ca
1 changed files with 9 additions and 4 deletions
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13
net/netfilter/nft_meta.c
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@ -266,6 +266,13 @@ static bool nft_meta_get_eval_ifname(enum nft_meta_keys key, u32 *dest,
return true; return true;
} }
static noinline u32 nft_prandom_u32(void)
{
struct rnd_state *state = this_cpu_ptr(&nft_prandom_state);
return prandom_u32_state(state);
}
void nft_meta_get_eval(const struct nft_expr *expr, void nft_meta_get_eval(const struct nft_expr *expr,
struct nft_regs *regs, struct nft_regs *regs,
const struct nft_pktinfo *pkt) const struct nft_pktinfo *pkt)
@ -344,11 +351,9 @@ void nft_meta_get_eval(const struct nft_expr *expr,
goto err; goto err;
break; break;
#endif #endif
case NFT_META_PRANDOM: { case NFT_META_PRANDOM:
struct rnd_state *state = this_cpu_ptr(&nft_prandom_state); *dest = nft_prandom_u32();
*dest = prandom_u32_state(state);
break; break;
}
#ifdef CONFIG_XFRM #ifdef CONFIG_XFRM
case NFT_META_SECPATH: case NFT_META_SECPATH:
nft_reg_store8(dest, secpath_exists(skb)); nft_reg_store8(dest, secpath_exists(skb));