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Commit bd8699e9 authored by Pablo Neira Ayuso's avatar Pablo Neira Ayuso
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netfilter: nft_bitwise: add offload support 



Extract mask from bitwise operation and store it into the corresponding
context register so the cmp instruction can set the mask accordingly.

Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent 7e59b3fe

net/netfilter/nft_bitwise.c

+19 −0
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ 
#include <linux/netfilter/nf_tables.h>

#include <net/netfilter/nf_tables_core.h>

#include <net/netfilter/nf_tables.h>

#include <net/netfilter/nf_tables_offload.h>



struct nft_bitwise {

	enum nft_registers	sreg:8;
@@ -126,12 +127,30 @@ static int nft_bitwise_dump(struct sk_buff *skb, const struct nft_expr *expr) 
	return -1;

}



static struct nft_data zero;



static int nft_bitwise_offload(struct nft_offload_ctx *ctx,

                               struct nft_flow_rule *flow,

                               const struct nft_expr *expr)

{

	const struct nft_bitwise *priv = nft_expr_priv(expr);



	if (memcmp(&priv->xor, &zero, sizeof(priv->xor) ||

	    priv->sreg != priv->dreg))

		return -EOPNOTSUPP;



	memcpy(&ctx->regs[priv->dreg].mask, &priv->mask, sizeof(priv->mask));



	return 0;

}



static const struct nft_expr_ops nft_bitwise_ops = {

	.type		= &nft_bitwise_type,

	.size		= NFT_EXPR_SIZE(sizeof(struct nft_bitwise)),

	.eval		= nft_bitwise_eval,

	.init		= nft_bitwise_init,

	.dump		= nft_bitwise_dump,

	.offload	= nft_bitwise_offload,

};



struct nft_expr_type nft_bitwise_type __read_mostly = {