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6: LAN Message Filtering

DC 900-1325I 81

way's msgmux process. Once loaded, the msgmux process executes the

fwymod_init() function in that library.

2. It provides a function called muxFilterHook(), which can be used to specify two

user-written functions: one to be called for every packet received from a WAN link

and another to be called for every packet destined for a WAN link.

Together these two actions make it easy to create filter SRAs. All that is necessary is to

create a shared library containing the two filter functions and a

fwymod_init() function

which calls

muxFilterHook() to register the two filter functions.

6.1 msgmux Filter Hook

The message multiplexor (msgmux) process provides a function (muxFilterHook) that

allows you to register two filter functions: one to filter messages moving from the WAN,

and one to filter messages moving to the WAN. The

muxFilterHook function is declared

as follows:

void muxFilterHook (int(*pFromWANFilter)(char *pBuf),

int(*pToWANFilter)(char *pBuf));

The arguments to muxFilterHook are defined as follows:

pFromWANFilter

This is a pointer to the function that filters the messages mov-

ing from the WAN.

pToWANFilter

This is a pointer to the function that filters the messages mov-

ing to the WAN.

Both arguments must be provided in the call to muxFilterHook; however, either or both

arguments can be

NULL pointers. If a NULL pointer is provided as the first argument,

the

msgmux task makes no calls to the function filtering the messages moving from the

WAN. Similarly, if a

NULL pointer is provided as the second argument, the msgmux task

makes no calls to the function filtering the messages moving to the WAN. The

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Protogate Freeway 3112 Guía de instalación Pagina 81