netfilter: nf_osf: add nf_osf_find()
This new function returns the OS genre as a string. Plan is to use to from the new nft_osf extension. Note that this doesn't yet support ttl options, but it could be easily extended to do so. Tested-by: NFernando Fernandez Mancera <ffmancera@riseup.net> Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
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