Commit 71d6ded3 authored by Jeremy Sowden's avatar Jeremy Sowden Committed by Pablo Neira Ayuso
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netfilter: bitwise: add helper for evaluating boolean operations. 



Split the code specific to evaluating bitwise boolean operations out
into a separate function.  Similar functions will be added later for
shift operations.

Signed-off-by: default avatarJeremy Sowden <jeremy@azazel.net>
Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent 3f8d9eb0

net/netfilter/nft_bitwise.c

+14 −3
Original line number Diff line number Diff line
@@ -24,16 +24,27 @@ struct nft_bitwise { 
	struct nft_data		xor;

};



static void nft_bitwise_eval_bool(u32 *dst, const u32 *src,

				  const struct nft_bitwise *priv)

{

	unsigned int i;



	for (i = 0; i < DIV_ROUND_UP(priv->len, 4); i++)

		dst[i] = (src[i] & priv->mask.data[i]) ^ priv->xor.data[i];

}



void nft_bitwise_eval(const struct nft_expr *expr,

		      struct nft_regs *regs, const struct nft_pktinfo *pkt)

{

	const struct nft_bitwise *priv = nft_expr_priv(expr);

	const u32 *src = &regs->data[priv->sreg];

	u32 *dst = &regs->data[priv->dreg];

	unsigned int i;



	for (i = 0; i < DIV_ROUND_UP(priv->len, 4); i++)

		dst[i] = (src[i] & priv->mask.data[i]) ^ priv->xor.data[i];

	switch (priv->op) {

	case NFT_BITWISE_BOOL:

		nft_bitwise_eval_bool(dst, src, priv);

		break;

	}

}



static const struct nla_policy nft_bitwise_policy[NFTA_BITWISE_MAX + 1] = {