Zilog EZ80F91GA - Manual (Page 85)

UM024502-1012 ZGATE Logging Page
ZGATE Embedded Security Development Kit
User Manual
73
ZGATE_add_tcp_port
Function Prototype
INT16 ZGATE_add_tcp_port( INT32 PortNumber );
Parameters
PortNumber TCP port number to be added to the TCP port static filtering list.
The value of
PortNumber must be between 0 and 65535.
Return Value
TRUE PortNumber was successfully added to the TCP port static filter-
ing list.
FALSE PortNumber is invalid, already exists in the TCP port static fil-
tering list, the list is full, or the TCP Port filter is disabled.
Description
When the TCP Port filter is operating in WHITELIST (forwarding) or BLACKLIST
(blocking) Mode, it extracts the destination TCP port number from inbound TCP data seg-
ments and compares the target port number to entries in the TCP port list. If a match is
found, the packet is forwarded to ZTP if the filter operates in WHITELIST Mode, and
blocked from TCP if the filter operates in BLACKLIST Mode.
This API is used to add an entry to the TCP Port static filtering list. Entries cannot be
added to the TCP Port list if the TCP Port filter is disabled.