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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: Jeremy Sowden <jeremy@azazel.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Jeremy Sowden 2020-01-15 20:05:53 +00:00 committed by Pablo Neira Ayuso
parent 3f8d9eb032
commit 71d6ded3ac
1 changed files with 14 additions and 3 deletions
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17
net/netfilter/nft_bitwise.c
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@ -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] = {