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netfilter: nft_flow_offload: don't offload when sequence numbers need adjustment 

We can't deal with tcp sequence number rewrite in flow_offload.
While at it, simplify helper check, we only need to know if the extension
is present, we don't need the helper data.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2019-05-21 13:24:32 +02:00 committed by Pablo Neira Ayuso
parent 8437a6209f
commit 91a9048f23
1 changed files with 2 additions and 4 deletions
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6
net/netfilter/nft_flow_offload.c
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@ -12,7 +12,6 @@
#include <net/netfilter/nf_conntrack_core.h>
#include <linux/netfilter/nf_conntrack_common.h>
#include <net/netfilter/nf_flow_table.h>
#include <net/netfilter/nf_conntrack_helper.h>
struct nft_flow_offload {
struct nft_flowtable *flowtable;
@ -67,7 +66,6 @@ static void nft_flow_offload_eval(const struct nft_expr *expr,
{
struct nft_flow_offload *priv = nft_expr_priv(expr);
struct nf_flowtable *flowtable = &priv->flowtable->data;
const struct nf_conn_help *help;
enum ip_conntrack_info ctinfo;
struct nf_flow_route route;
struct flow_offload *flow;
@ -93,8 +91,8 @@ static void nft_flow_offload_eval(const struct nft_expr *expr,
goto out;
}
help = nfct_help(ct);
if (help)
if (nf_ct_ext_exist(ct, NF_CT_EXT_HELPER) ||
ct->status & IPS_SEQ_ADJUST)
goto out;
if (!nf_ct_is_confirmed(ct))