o Added initial SCTP port scanning support to Nmap. SCTP is

a layer 4 protocol used mostly for telephony related applications.
  This brings the following new features:
  o SCTP INIT chunk port scan (-sY): open ports return an INIT-ACK
    chunk, closed ones an ABORT chunk.  This is the SCTP equivalent
    of a TCP SYN stealth scan.
  o SCTP COOKIE-ECHO chunk port scan (-sZ): open ports are silent,
    closed ports return an ABORT chunk.
  o SCTP INIT chunk ping probes (-PY): host discovery using SCTP
    INIT chunk packets.
  o SCTP-specific IP protocol scan (-sO -p sctp).
  o SCTP-specific traceroute support (--traceroute).
  o The ability to use the deprecated Adler32 algorithm as specified
    in RFC 2960 instead of CRC32C from RFC 4960 (--adler32).
  o 42 well-known SCTP ports were added to the nmap-services file.
  Part of the work on SCTP support was kindly sponsored by
  Compass Security AG, Switzerland.  [Daniel Roethlisberger]

tcpip.h

@@ -525,6 +525,20 @@ u8 *build_udp_raw(struct in_addr *source, const struct in_addr *victim,
  		  char *data, u16 datalen,
  		  u32 *packetlen);
 
+/* Builds an SCTP packet (including an IP header) by packing the fields
+   with the given information.  It allocates a new buffer to store the
+   packet contents, and then returns that buffer.  The packet is not
+   actually sent by this function.  Caller must delete the buffer when
+   finished with the packet.  The packet length is returned in
+   packetlen, which must be a valid int pointer. */
+u8 *build_sctp_raw(const struct in_addr *source, const struct in_addr *victim,
+		   int ttl, u16 ipid, u8 tos, bool df,
+		   u8* ipopt, int ipoptlen,
+		   u16 sport, u16 dport,
+		   u32 vtag, char *chunks, int chunkslen,
+		   char *data, u16 datalen,
+		   u32 *packetlen);
+
 /* Builds an ICMP packet (including an IP header) by packing the
    fields with the given information.  It allocates a new buffer to
    store the packet contents, and then returns that buffer.  The