Add IGMPv1 header with reserved-byte preservation, layer integration, and tests

Author: Jeffrey Moon

etherparse/src/err/layer.rs

@@ -50,6 +50,8 @@ pub enum Layer {
     Icmpv4TimestampReply,
     /// Error occurred while parsing an ICMPv6 packet.
     Icmpv6,
+    /// Error occurred while parsing an IGMPv1 packet.
+    Igmpv1,
     /// Error occurred while parsing an Address Resolution Protocol packet.
     Arp,
 }
@@ -83,6 +85,7 @@ impl Layer {
             Icmpv4Timestamp => "ICMP Timestamp Error",
             Icmpv4TimestampReply => "ICMP Timestamp Reply Error",
             Icmpv6 => "ICMPv6 Packet Error",
+            Igmpv1 => "IGMPv1 Packet Error",
             Arp => "Address Resolution Protocol Packet Error",
         }
     }
@@ -116,6 +119,7 @@ impl core::fmt::Display for Layer {
             Icmpv4Timestamp => write!(f, "ICMP timestamp message"),
             Icmpv4TimestampReply => write!(f, "ICMP timestamp reply message"),
             Icmpv6 => write!(f, "ICMPv6 packet"),
+            Igmpv1 => write!(f, "IGMPv1 packet"),
             Arp => write!(f, "Address Resolution Protocol packet"),
         }
     }
@@ -185,6 +189,7 @@ mod test {
             (Icmpv4Timestamp, "ICMP Timestamp Error"),
             (Icmpv4TimestampReply, "ICMP Timestamp Reply Error"),
             (Icmpv6, "ICMPv6 Packet Error"),
+            (Igmpv1, "IGMPv1 Packet Error"),
             (Arp, "Address Resolution Protocol Packet Error"),
         ];
         for test in tests {
@@ -219,6 +224,7 @@ mod test {
             (Icmpv4Timestamp, "ICMP timestamp message"),
             (Icmpv4TimestampReply, "ICMP timestamp reply message"),
             (Icmpv6, "ICMPv6 packet"),
+            (Igmpv1, "IGMPv1 packet"),
             (Arp, "Address Resolution Protocol packet"),
         ];
         for test in tests {