diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 54f23c3..2b53f3a 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -3557,6 +3557,22 @@ union bpf_attr {
  *			This flag is only valid for XDP programs; tc programs
  *			receive -EINVAL since they can redirect to the VLAN
  *			device directly.
+ *		**BPF_FIB_LOOKUP_VLAN_INPUT**
+ *			Treat *params*->h_vlan_proto and *params*->h_vlan_TCI
+ *			as an input VLAN tag and run the lookup as if ingress
+ *			had happened on the VLAN subinterface carrying that tag
+ *			on *params*->ifindex. The VID is the low 12 bits of
+ *			*params*->h_vlan_TCI; *params*->h_vlan_proto must be
+ *			ETH_P_8021Q or ETH_P_8021AD in network byte order, else
+ *			**-EINVAL**. If *params*->ifindex is itself a VLAN
+ *			device, its inner (QinQ) subinterface is matched; for a
+ *			bond or team, pass the master's ifindex. An unmatched
+ *			tag, a down device, or one in another namespace returns
+ *			**BPF_FIB_LKUP_RET_NOT_FWDED**, mirroring real ingress.
+ *			A VID of 0 is looked up literally, so do not set this
+ *			flag for priority-tagged frames. Cannot be combined with
+ *			**BPF_FIB_LOOKUP_TBID** or **BPF_FIB_LOOKUP_OUTPUT**
+ *			(returns **-EINVAL**).
  *
  *		*ctx* is either **struct xdp_md** for XDP programs or
  *		**struct sk_buff** tc cls_act programs.
@@ -7365,6 +7381,7 @@ enum {
 	BPF_FIB_LOOKUP_SRC     = (1U << 4),
 	BPF_FIB_LOOKUP_MARK    = (1U << 5),
 	BPF_FIB_LOOKUP_VLAN    = (1U << 6),
+	BPF_FIB_LOOKUP_VLAN_INPUT = (1U << 7),
 };
 
 enum {
@@ -7435,7 +7452,9 @@ struct bpf_fib_lookup {
 			/*
 			 * output with BPF_FIB_LOOKUP_VLAN: set from the
 			 * resolved egress VLAN device (see the flag); zeroed
-			 * on other successful lookups.
+			 * on other successful lookups. input with
+			 * BPF_FIB_LOOKUP_VLAN_INPUT: the VLAN tag to scope
+			 * the lookup by.
 			 */
 			__be16	h_vlan_proto;
 			__be16	h_vlan_TCI;