netfilter: bitwise: add helper for evaluating boolean operations. (71d6ded3) · Commits · 戴 / test

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:

Jeremy Sowden <jeremy@azazel.net> Signed-off-by:

Pablo Neira Ayuso <pablo@netfilter.org>

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] = {

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