--source-port,--sport [!] port[:port]

--destination-port,--dport [!] port[:port]

--chunk-types [!] all|any|only chunktype[:flags] [...]
    The flag letter in upper case indicates that the flag is to match if set, in the lower case indicates to match if unset. Chunk types: DATA INIT INIT_ACK SACK HEARTBEAT HEARTBEAT_ACK ABORT SHUTDOWN SHUTDOWN_ACK ERROR COOKIE_ECHO COOKIE_ACK ECN_ECNE ECN_CWR SHUTDOWN_COMPLETE ASCONF ASCONF_ACK chunk type available flags
    DATA U B E u b e
    ABORT T t
    SHUTDOWN_COMPLETE T t (lowercase means flag should be "off", uppercase means "on")

Examples: iptables -A INPUT -p sctp --dport 80 -j DROP iptables -A INPUT -p sctp --chunk-types any DATA,INIT -j DROP iptables -A INPUT -p sctp --chunk-types any DATA:Be -j ACCEPT