adding ethhdr type for linux/android for proper packet filtering.

Author: devnexen

libc-test/semver/android.txt

@@ -3230,6 +3230,7 @@ epoll_create1
 epoll_ctl
 epoll_event
 epoll_wait
+ethhdr
 eventfd
 eventfd_read
 eventfd_write

libc-test/semver/linux.txt

@@ -3722,6 +3722,7 @@ epoll_params
 epoll_pwait
 epoll_wait
 erand48
+ethhdr
 eventfd
 eventfd_read
 eventfd_write

src/unix/linux_like/android/mod.rs

@@ -34,6 +34,8 @@ pub type __u16 = c_ushort;
 pub type __s16 = c_short;
 pub type __u32 = c_uint;
 pub type __s32 = c_int;
+// __be16 is big endian __u16
+pub type __be16 = [__u16; 1];
 
 // linux/elf.h
 
@@ -638,6 +640,13 @@ s_no_extra_traits! {
         pub ifc_len: c_int,
         pub ifc_ifcu: __c_anonymous_ifc_ifcu,
     }
+
+    #[repr(align(1))]
+    pub struct ethhdr {
+        pub h_dest: [c_uchar; crate::ETH_ALEN as usize],
+        pub h_source: [c_uchar; crate::ETH_ALEN as usize],
+        pub h_proto: crate::__be16,
+    }
 }
 
 cfg_if! {
@@ -1020,6 +1029,31 @@ cfg_if! {
                     .finish()
             }
         }
+
+        impl Eq for ethhdr {}
+
+        impl PartialEq for ethhdr {
+            fn eq(&self, other: &ethhdr) -> bool {
+                self.h_dest
+                    .iter()
+                    .zip(other.h_dest.iter())
+                    .all(|(a, b)| a == b)
+                    && self
+                        .h_source
+                        .iter()
+                        .zip(other.h_source.iter())
+                        .all(|(a, b)| a == b)
+            }
+        }
+
+        impl fmt::Debug for ethhdr {
+            fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+                f.debug_struct("ethhdr")
+                    .field("h_dest", &self.h_dest)
+                    .field("h_source", &self.h_source)
+                    .finish()
+            }
+        }
     }
 }
 

src/unix/linux_like/linux/mod.rs

@@ -28,6 +28,8 @@ pub type __u16 = c_ushort;
 pub type __s16 = c_short;
 pub type __u32 = c_uint;
 pub type __s32 = c_int;
+// __be16 is big endian __u16
+pub type __be16 = [__u16; 1];
 
 pub type Elf32_Half = u16;
 pub type Elf32_Word = u32;
@@ -1784,6 +1786,13 @@ s_no_extra_traits! {
         pub request: xsk_tx_metadata_request,
         pub completion: xsk_tx_metadata_completion,
     }
+
+    #[repr(packed)]
+    pub struct ethhdr {
+        pub h_dest: [c_uchar; crate::ETH_ALEN as usize],
+        pub h_source: [c_uchar; crate::ETH_ALEN as usize],
+        pub h_proto: crate::__be16,
+    }
 }
 
 cfg_if! {
@@ -2211,6 +2220,31 @@ cfg_if! {
                     .finish()
             }
         }
+
+        impl Eq for ethhdr {}
+
+        impl PartialEq for ethhdr {
+            fn eq(&self, other: &ethhdr) -> bool {
+                self.h_dest
+                    .iter()
+                    .zip(other.h_dest.iter())
+                    .all(|(a, b)| a == b)
+                    && self
+                        .h_source
+                        .iter()
+                        .zip(other.h_source.iter())
+                        .all(|(a, b)| a == b)
+            }
+        }
+
+        impl fmt::Debug for ethhdr {
+            fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+                f.debug_struct("ethhdr")
+                    .field("h_dest", &self.h_dest)
+                    .field("h_source", &self.h_source)
+                    .finish()
+            }
+        }
     }
 }