diff --git a/ebpf/aya-ebpf/src/lib.rs b/ebpf/aya-ebpf/src/lib.rs
index b0e4e344..1cc5ef1d 100644
--- a/ebpf/aya-ebpf/src/lib.rs
+++ b/ebpf/aya-ebpf/src/lib.rs
@@ -113,6 +113,19 @@ mod intrinsics {
     }
 }
 
+/// Builds a flag for [`SkBuffContext::adjust_room`] that defines L2 encapsulation,
+/// using `len` as the inner MAC header length.
+///
+/// Equivalent to the [`BPF_F_ADJ_ROOM_ENCAP_L2`][uapi-bpf-adj-room-encap-l2] macro
+/// in the Linux user-space API.
+///
+/// [uapi-bpf-adj-room-encap-l2]: https://elixir.bootlin.com/linux/v6.16.4/source/include/uapi/linux/bpf.h#L6149
+#[inline(always)]
+#[allow(non_snake_case)]
+pub fn BPF_F_ADJ_ROOM_ENCAP_L2(len: u64) -> u64 {
+    (len & u64::from(bindings::BPF_ADJ_ROOM_ENCAP_L2_MASK)) << bindings::BPF_ADJ_ROOM_ENCAP_L2_SHIFT
+}
+
 /// Check if a value is within a range, using conditional forms compatible with
 /// the verifier.
 #[inline(always)]
diff --git a/xtask/public-api/aya-ebpf.txt b/xtask/public-api/aya-ebpf.txt
index a78b1758..79031a38 100644
--- a/xtask/public-api/aya-ebpf.txt
+++ b/xtask/public-api/aya-ebpf.txt
@@ -2989,4 +2989,5 @@ impl aya_ebpf::EbpfContext for aya_ebpf::programs::tracepoint::TracePointContext
 pub fn aya_ebpf::programs::tracepoint::TracePointContext::as_ptr(&self) -> *mut core::ffi::c_void
 impl aya_ebpf::EbpfContext for aya_ebpf::programs::xdp::XdpContext
 pub fn aya_ebpf::programs::xdp::XdpContext::as_ptr(&self) -> *mut core::ffi::c_void
+pub fn aya_ebpf::BPF_F_ADJ_ROOM_ENCAP_L2(len: u64) -> u64
 pub fn aya_ebpf::check_bounds_signed(value: i64, lower: i64, upper: i64) -> bool