[PATCH 5.12 449/700] netfilter: nf_tables_offload: check FLOW_DISSECTOR_KEY_BASIC in VLAN transfer logic

[Greg Kroah-Hartman]

From: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>

[ Upstream commit ea45fdf82cc90430bb7c280e5e53821e833782c5 ]

The VLAN transfer logic should actually check for
FLOW_DISSECTOR_KEY_BASIC, not FLOW_DISSECTOR_KEY_CONTROL. Moreover, do
not fallback to case 2) .n_proto is set to 802.1q or 802.1ad, if
FLOW_DISSECTOR_KEY_BASIC is unset.

Fixes: 783003f3bb8a ("netfilter: nftables_offload: special ethertype handling for VLAN")
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 net/netfilter/nf_tables_offload.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/net/netfilter/nf_tables_offload.c b/net/netfilter/nf_tables_offload.c
index 2b00f7f47693..9ce776175214 100644
--- a/net/netfilter/nf_tables_offload.c
+++ b/net/netfilter/nf_tables_offload.c
@@ -54,15 +54,10 @@ static void nft_flow_rule_transfer_vlan(struct nft_offload_ctx *ctx,
 					struct nft_flow_rule *flow)
 {
 	struct nft_flow_match *match = &flow->match;
-	struct nft_offload_ethertype ethertype;
-
-	if (match->dissector.used_keys & BIT(FLOW_DISSECTOR_KEY_CONTROL) &&
-	    match->key.basic.n_proto != htons(ETH_P_8021Q) &&
-	    match->key.basic.n_proto != htons(ETH_P_8021AD))
-		return;
-
-	ethertype.value = match->key.basic.n_proto;
-	ethertype.mask = match->mask.basic.n_proto;
+	struct nft_offload_ethertype ethertype = {
+		.value	= match->key.basic.n_proto,
+		.mask	= match->mask.basic.n_proto,
+	};
 
 	if (match->dissector.used_keys & BIT(FLOW_DISSECTOR_KEY_VLAN) &&
 	    (match->key.vlan.vlan_tpid == htons(ETH_P_8021Q) ||
@@ -76,7 +71,9 @@ static void nft_flow_rule_transfer_vlan(struct nft_offload_ctx *ctx,
 		match->dissector.offset[FLOW_DISSECTOR_KEY_CVLAN] =
 			offsetof(struct nft_flow_key, cvlan);
 		match->dissector.used_keys |= BIT(FLOW_DISSECTOR_KEY_CVLAN);
-	} else {
+	} else if (match->dissector.used_keys & BIT(FLOW_DISSECTOR_KEY_BASIC) &&
+		   (match->key.basic.n_proto == htons(ETH_P_8021Q) ||
+		    match->key.basic.n_proto == htons(ETH_P_8021AD))) {
 		match->key.basic.n_proto = match->key.vlan.vlan_tpid;
 		match->mask.basic.n_proto = match->mask.vlan.vlan_tpid;
 		match->key.vlan.vlan_tpid = ethertype.value;
-- 
2.30.2