From bd8699e9e29287b5571b32b68c3dcd05985fa9b1 Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Tue, 30 Jul 2019 13:32:01 +0200 Subject: [PATCH] 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: Pablo Neira Ayuso --- net/netfilter/nft_bitwise.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/net/netfilter/nft_bitwise.c b/net/netfilter/nft_bitwise.c index b310b637b550..1f04ed5c518c 100644 --- a/net/netfilter/nft_bitwise.c +++ b/net/netfilter/nft_bitwise.c @@ -13,6 +13,7 @@ #include #include #include +#include struct nft_bitwise { enum nft_registers sreg:8; @@ -126,12 +127,30 @@ nla_put_failure: 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 = { -- 2.30.2