Add support to match sctp

This commmit introduces to the parsing engine the specification
of the sctp header. Now it is possible to match sctp src and dst
ports.

customnetpdl.xml

@@ -737,6 +737,7 @@
                     <case value="1"> <nextproto proto="#icmp"/> </case>
 					<case value="6"> <nextproto proto="#tcp"/> </case>
 					<case value="17"> <nextproto proto="#udp"/> </case>
+					<case value="132"> <nextproto proto="#sctp"/> </case>
 				</switch>
 			</if-true>
 		</if>
@@ -1043,7 +1044,7 @@
 <!--			<case value="29"> <nextproto proto="#TP4"/> </case> -->
 <!--			<case value="45"> <nextproto proto="#IDRP"/> </case> -->
 			<case value="58"> <nextproto proto="#icmp6"/> </case>
-
+			<case value="132"> <nextproto proto="#sctp"/> </case>
 		</switch>
 	</encapsulation>
 
@@ -1737,7 +1738,6 @@
 		</fields>
 	</format>
 
-
 	<visualization>
 		<showsumtemplate name="udp">
 			<section name="next"/>
@@ -1749,6 +1749,28 @@
 	</visualization>
 </protocol>
 
+<protocol name="sctp" longname="SCTP (Stream Control Transmission Protocol)" showsumtemplate="sctp">
+
+	<format>
+		<fields>
+			<field type="fixed" name="sport" size="2" showtemplate="FieldDec"/>
+			<field type="fixed" name="dport" size="2" showtemplate="FieldDec"/>
+			<field type="fixed" name="ver_tag" longname="Verification Tag" size="4" showtemplate="FieldDec"/>	
+			<field type="fixed" name="crc" longname="Checksum" size="4" showtemplate="FieldHex"/>
+		</fields>
+	</format>
+
+	<visualization>
+		<showsumtemplate name="sctp">
+			<section name="next"/>
+			<text value="SCTP: port "/>
+			<protofield name="sport" showdata="showvalue"/>
+			<text value=" => "/>
+			<protofield name="dport" showdata="showvalue"/>
+		</showsumtemplate>
+	</visualization>
+</protocol>
+
 <protocol name="icmp" longname="ICMP (Internet Control Message Protocol)" showsumtemplate="icmp">
 	<format>
 		<fields>

lib/packets.h

@@ -349,7 +349,7 @@ BUILD_ASSERT_DECL(TCP_HEADER_LEN == sizeof(struct tcp_header));
 struct sctp_header {
     uint16_t sctp_src;
     uint16_t sctp_dst;
-    uint32_t sctp_verif;
+    uint32_t sctp_ver_tag;
     uint32_t sctp_csum;
 };
 BUILD_ASSERT_DECL(SCTP_HEADER_LEN == sizeof(struct sctp_header));

nbee_link/nbee_link.cpp

@@ -570,6 +570,10 @@ extern "C" int nblink_packet_parse(struct ofpbuf * pktin,  struct ofl_match * pk
             else if (protocol_Name.compare("sctp") == 0 && pkt_proto->sctp == NULL)
             {
                 pkt_proto->sctp = (struct sctp_header *) ((uint8_t*) pktin->data + proto->Position);
+                PDMLReader->GetPDMLField(proto->Name, (char*) "sport", proto->FirstField, &field);
+                nblink_extract_proto_fields(pktin, field, pktout, OXM_OF_SCTP_SRC);
+                PDMLReader->GetPDMLField(proto->Name, (char*) "dport", proto->FirstField, &field);
+                nblink_extract_proto_fields(pktin, field, pktout, OXM_OF_SCTP_DST);
             }
 
             if (protocol_Name.compare("icmp") == 0 && pkt_proto->icmp == NULL){