bpf: sk_buff: Add get_socket_uid method to SkBuffContext

This change exposes the BPF helper bpf_socket_get_uid as a public method
of SkBuffContext, which allows to get the owner UID of the socket
associated to the sk_buff stored in the context.

Signed-off-by: Michal Rostecki <vadorovsky@gmail.com>

bpf/aya-bpf/src/programs/sk_buff.rs

@@ -4,8 +4,8 @@ use core::{
 };
 
 use aya_bpf_bindings::helpers::{
-    bpf_clone_redirect, bpf_l3_csum_replace, bpf_l4_csum_replace, bpf_skb_adjust_room,
-    bpf_skb_change_type, bpf_skb_load_bytes, bpf_skb_store_bytes,
+    bpf_clone_redirect, bpf_get_socket_uid, bpf_l3_csum_replace, bpf_l4_csum_replace,
+    bpf_skb_adjust_room, bpf_skb_change_type, bpf_skb_load_bytes, bpf_skb_store_bytes,
 };
 use aya_bpf_cty::c_long;
 
@@ -41,6 +41,12 @@ impl SkBuffContext {
         unsafe { &mut (*self.skb).cb }
     }
 
+    /// Returns the owner UID of the socket associated to the SKB context.
+    #[inline]
+    pub fn get_socket_uid(&self) -> u32 {
+        unsafe { bpf_get_socket_uid(self.skb) }
+    }
+
     #[inline]
     pub fn load<T>(&self, offset: usize) -> Result<T, c_long> {
         unsafe {