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Re: Multiple Protocol Filters

Check the ubiquitous SharedIP NKE. It uses several filters.

The 'location' parameter allows you to specify that you want the filter to be inserted before or after a specific pre-existing filter. If that filter is 'NULL', 'before' means "at the beginning of the list" and 'after', well, should be obvious.

Note that NKE != filter. In the case of SharedIP, there are multiple filters in one NKE.

Regards,

Justin

On Sunday, Dec 15, 2002, at 19:52 US/Pacific, Ben Lachman wrote:

Does anyone know the process for installing multiple socket based protocol filters from one NKE? For instance, I would like to filter both TCP and UDP from a single extension. I noticed that register_socketfilter()'s definition in kext_net.h says a bit about insert location, but doesn't explain it at all:

/* How to register: filter, insert location, target protosw, flags */
extern int register_sockfilter(struct NFDescriptor *,
struct NFDescriptor *,
struct protosw *, int);


Any advice would be great!

->Ben

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References: 
 >Multiple Protocol Filters (From: Ben Lachman <email@hidden>)



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