I'm interested in whether the following could be acomplished: there's KLD module, installing some new syscalls in the kernel, as well as installing new ``struct ipprotosw'' for some protocol or another(let's assume IPPROTO_UDP). Could we just add some code in the begging of the new protocol handler (counting, statistics , etc...) and call the old one after doing that. If possible, what should be the preparation for that last call ? Any help appreciated!
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