Clippy fixes.

src/iface/fragmentation.rs

@@ -364,7 +364,7 @@ impl<'a, K: Eq + Ord + Clone + Copy> PacketAssemblerSet<'a, K> {
     /// - Returns [`Error::PacketAssemblerSetKeyNotFound`] when the key was not found in the set.
     pub(crate) fn get_packet_assembler_mut(&mut self, key: &K) -> Result<&mut PacketAssembler<'a>> {
         if let Some(i) = self.index_buffer.get(key) {
-            Ok(&mut self.packet_buffer[*i as usize])
+            Ok(&mut self.packet_buffer[*i])
         } else {
             Err(Error::PacketAssemblerSetKeyNotFound)
         }
@@ -379,7 +379,7 @@ impl<'a, K: Eq + Ord + Clone + Copy> PacketAssemblerSet<'a, K> {
     /// - Returns [`Error::PacketAssemblerIncomplete`] when the fragments assembler was empty or not fully assembled.
     pub(crate) fn get_assembled_packet(&mut self, key: &K) -> Result<&[u8]> {
         if let Some(i) = self.index_buffer.get(key) {
-            let p = self.packet_buffer[*i as usize].assemble()?;
+            let p = self.packet_buffer[*i].assemble()?;
             self.index_buffer.remove(key);
             Ok(p)
         } else {
@@ -392,10 +392,7 @@ impl<'a, K: Eq + Ord + Clone + Copy> PacketAssemblerSet<'a, K> {
         loop {
             let mut key = None;
             for (k, i) in self.index_buffer.iter() {
-                if matches!(
-                    self.packet_buffer[*i as usize].assembler,
-                    AssemblerState::NotInit
-                ) {
+                if matches!(self.packet_buffer[*i].assembler, AssemblerState::NotInit) {
                     key = Some(*k);
                     break;
                 }
@@ -416,7 +413,7 @@ impl<'a, K: Eq + Ord + Clone + Copy> PacketAssemblerSet<'a, K> {
         F: Fn(&mut PacketAssembler<'_>) -> Result<bool>,
     {
         for (_, i) in &mut self.index_buffer.iter() {
-            let frag = &mut self.packet_buffer[*i as usize];
+            let frag = &mut self.packet_buffer[*i];
             if f(frag)? {
                 frag.mark_discarded();
             }

src/iface/interface/ipv4.rs

@@ -507,7 +507,7 @@ impl<'a> InterfaceInner<'a> {
             }
 
             tx_buffer[repr.buffer_len()..][..payload_len].copy_from_slice(
-                &buffer[*frag_offset as usize + repr.buffer_len() as usize..][..payload_len],
+                &buffer[*frag_offset as usize + repr.buffer_len()..][..payload_len],
             );
 
             // Update the frag offset for the next fragment.

src/socket/tcp.rs

@@ -129,7 +129,7 @@ impl Default for RttEstimator {
 impl RttEstimator {
     fn retransmission_timeout(&self) -> Duration {
         let margin = RTTE_MIN_MARGIN.max(self.deviation * 4);
-        let ms = (self.rtt + margin).max(RTTE_MIN_RTO).min(RTTE_MAX_RTO);
+        let ms = (self.rtt + margin).clamp(RTTE_MIN_RTO, RTTE_MAX_RTO);
         Duration::from_millis(ms as u64)
     }
 
@@ -1442,7 +1442,7 @@ impl<'a> Socket<'a> {
 
                 if segment_in_window {
                     // We've checked that segment_start >= window_start above.
-                    payload_offset = (segment_start - window_start) as usize;
+                    payload_offset = segment_start - window_start;
                     self.local_rx_last_seq = Some(repr.seq_number);
                 } else {
                     // If we're in the TIME-WAIT state, restart the TIME-WAIT timeout, since

src/wire/icmpv6.rs

@@ -555,7 +555,7 @@ impl<'a> Repr<'a> {
         {
             let ip_packet = Ipv6Packet::new_checked(packet.payload())?;
 
-            let payload = &packet.payload()[ip_packet.header_len() as usize..];
+            let payload = &packet.payload()[ip_packet.header_len()..];
             if payload.len() < 8 {
                 return Err(Error);
             }

src/wire/igmp.rs

@@ -72,7 +72,7 @@ impl<T: AsRef<[u8]>> Packet<T> {
     /// Returns `Err(Error)` if the buffer is too short.
     pub fn check_len(&self) -> Result<()> {
         let len = self.buffer.as_ref().len();
-        if len < field::GROUP_ADDRESS.end as usize {
+        if len < field::GROUP_ADDRESS.end {
             Err(Error)
         } else {
             Ok(())

src/wire/ipv6hopbyhop.rs

@@ -296,14 +296,14 @@ mod test {
     #[test]
     fn test_header_len_overflow() {
         let mut bytes = vec![];
-        bytes.extend(&REPR_PACKET_PAD4);
+        bytes.extend(REPR_PACKET_PAD4);
         let len = bytes.len() as u8;
         Header::new_unchecked(&mut bytes).set_header_len(len + 1);
 
         assert_eq!(Header::new_checked(&bytes).unwrap_err(), Error);
 
         let mut bytes = vec![];
-        bytes.extend(&REPR_PACKET_PAD12);
+        bytes.extend(REPR_PACKET_PAD12);
         let len = bytes.len() as u8;
         Header::new_unchecked(&mut bytes).set_header_len(len + 1);
 

src/wire/ipv6routing.rs

@@ -169,7 +169,7 @@ impl<T: AsRef<[u8]>> Header<T> {
             return Err(Error);
         }
 
-        if len < field::DATA(self.header_len()).end as usize {
+        if len < field::DATA(self.header_len()).end {
             return Err(Error);
         }
 

src/wire/sixlowpan.rs

@@ -1215,10 +1215,9 @@ pub mod iphc {
             let mut len = 0;
             len += 2; // The minimal header length
 
-            len += if self.next_header == NextHeader::Compressed {
-                0 // The next header is compressed (we don't need to inline what the next header is)
-            } else {
-                1 // The next header field is inlined
+            len += match self.next_header {
+                NextHeader::Compressed => 0, // The next header is compressed (we don't need to inline what the next header is)
+                NextHeader::Uncompressed(_) => 1, // The next header field is inlined
             };
 
             // Hop Limit size
@@ -1604,10 +1603,10 @@ pub mod nhc {
         /// Return the size of the Next Header field.
         fn next_header_size(&self) -> usize {
             // If nh is set, then the Next Header is compressed using LOWPAN_NHC
-            if self.nh_field() == 1 {
-                0
-            } else {
-                1
+            match self.nh_field() {
+                0 => 1,
+                1 => 0,
+                _ => unreachable!(),
             }
         }
     }