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Npcap: Separate OPEN_INSTANCE struct into 2 different types #1572

dmiller-nmap opened this issue Apr 25, 2019 · 0 comments


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commented Apr 25, 2019

Right now, Npcap uses the same struct, typedef'd as OPEN_INSTANCE, to keep track of a filter module as well as each handle that a user program opens via PacketOpenAdapter. These are large structs: IntelliSense shows sizeof(OPEN_INSTANCE) to be 58416 bytes, allocated from non-paged memory (though I suppose we should evaluate that choice, too). And each one necessarily has a lot of dynamically-allocated members: 7 spin locks plus one for each CPU core, 256 bytes for the adapter name, and a NET_BUFFER_LIST structure pool. Most of this could be limited to the filter module itself (what the code calls the GroupHead).

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