From a05e37d47d55567d1504ca92b527527e32ae94bc Mon Sep 17 00:00:00 2001
From: Tim Upthegrove <tim.upthegrove@gmail.com>
Date: Wed, 22 Jan 2025 08:32:53 +0900
Subject: [PATCH] aya-ebpf: add ifindex support to XdpContext

This change exposes the ifindex field from the underlying xdp_md
data structure to the XdpContext in Aya. The ifindex represents the
unique OS-provided index for a network interface.

Fixes #1140
---
 ebpf/aya-ebpf/src/programs/xdp.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/ebpf/aya-ebpf/src/programs/xdp.rs b/ebpf/aya-ebpf/src/programs/xdp.rs
index 7513b46d..26c3369a 100644
--- a/ebpf/aya-ebpf/src/programs/xdp.rs
+++ b/ebpf/aya-ebpf/src/programs/xdp.rs
@@ -21,6 +21,12 @@ impl XdpContext {
         unsafe { (*self.ctx).data_end as usize }
     }
 
+    /// Return the interface of the index as determined by the OS.
+    #[inline]
+    pub fn ingress_ifindex(&self) -> usize {
+        unsafe { (*self.ctx).ingress_ifindex as usize }
+    }
+
     /// Return the raw address of the XdpContext metadata.
     #[inline(always)]
     pub fn metadata(&self) -> usize {