perf: Don't call read_unaligned in getter_be

src/arp.rs

@@ -7,7 +7,7 @@ use crate::{getter_be, setter_be};
 /// The ARP header is typically found after the Ethernet header and is used to
 /// map a network protocol address (like an IPv4 address) to a hardware
 /// address (like a MAC address).
-#[repr(C)]
+#[repr(C, align(4))]
 #[derive(Debug, Copy, Clone, Default)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct ArpHdr {

src/geneve.rs

@@ -3,7 +3,7 @@ use crate::{getter_be, setter_be};
 /// Represents a Geneve (Generic Network Virtualization Encapsulation) header, according to RFC 8926.
 /// Geneve is an encapsulation protocol designed for network virtualization.
 ///
-#[repr(C, packed)]
+#[repr(C, align(4))]
 #[derive(Debug, Copy, Clone, Default)]
 
 pub struct GeneveHdr {

src/ip.rs

@@ -10,7 +10,7 @@ pub enum IpHdr {
 }
 
 /// IPv4 header, which is present after the Ethernet header.
-#[repr(C)]
+#[repr(C, align(4))]
 #[derive(Debug, Copy, Clone)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct Ipv4Hdr {
@@ -166,7 +166,7 @@ impl Ipv4Hdr {
 }
 
 /// IPv6 header, which is present after the Ethernet header.
-#[repr(C)]
+#[repr(C, align(4))]
 #[derive(Debug, Copy, Clone)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct Ipv6Hdr {

src/lib.rs

@@ -29,14 +29,14 @@ pub mod vxlan;
 #[macro_export]
 macro_rules! getter_be {
     ($self:expr, $field:ident, $ty:ty) => {
-        core::ptr::read_unaligned(core::ptr::addr_of!($self.$field).cast::<$ty>())
+        *core::ptr::addr_of!($self.$field).cast::<$ty>()
     };
 }
 #[cfg(target_endian = "little")]
 #[macro_export]
 macro_rules! getter_be {
     ($self:expr, $field:ident, $ty:ty) => {
-        core::ptr::read_unaligned(core::ptr::addr_of!($self.$field).cast::<$ty>()).swap_bytes()
+        (&*core::ptr::addr_of!($self.$field).cast::<$ty>()).swap_bytes()
     };
 }
 

src/llc.rs

@@ -1,7 +1,7 @@
 use core::mem;
 
 /// Represents Logical Link Control according to ISO/IEC 8802-2 Definition
-#[repr(C, packed)]
+#[repr(C, align(4))]
 #[derive(Debug, Copy, Clone)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct LlcHdr {

src/mpls.rs

@@ -4,7 +4,7 @@ use core::mem;
 /// https://www.rfc-editor.org/rfc/rfc3032.html.
 /// This header format applies to all MPLS messages.
 /// 20 bits for Label - 3 for TC - 1 for S - 8 for TTL
-#[repr(C, packed)]
+#[repr(C)]
 #[derive(Debug, Copy, Clone)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct Mpls {

src/sctp.rs

@@ -1,6 +1,6 @@
 use core::mem;
 
-#[repr(C)]
+#[repr(C, align(4))]
 #[derive(Debug, Copy, Clone)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct SctpHdr {

src/tcp.rs

@@ -5,7 +5,7 @@ use crate::bitfield::BitfieldUnit;
 pub const TCP_HDR_LEN: usize = mem::size_of::<TcpHdr>();
 
 /// TCP header, which is present after the IP header.
-#[repr(C)]
+#[repr(C, align(4))]
 #[derive(Debug, Copy, Clone)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct TcpHdr {

src/udp.rs

@@ -24,7 +24,7 @@ use crate::{getter_be, setter_be};
 /// udp_header.set_len(28); // 8 bytes header + 20 bytes payload
 /// udp_header.set_checksum(0); // Checksum calculation would be done separately
 /// ```
-#[repr(C)]
+#[repr(C, align(4))]
 #[derive(Debug, Copy, Clone)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct UdpHdr {

src/vxlan.rs

@@ -6,7 +6,7 @@ use core::mem;
 /// Uses a 24-bit VXLAN Network Identifier (VNI) for traffic segregation.
 /// Header length: 8 bytes.
 /// Reference: RFC 7348.
-#[repr(C, packed)]
+#[repr(C, align(4))]
 #[derive(Debug, Copy, Clone)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct VxlanHdr {