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Message-ID: <20150323110133.GA13359@gondor.apana.org.au> Date: Mon, 23 Mar 2015 22:01:33 +1100 From: Herbert Xu <herbert@...dor.apana.org.au> To: David Miller <davem@...emloft.net> Cc: netdev@...r.kernel.org, roland@...estorage.com Subject: Re: arp_hash On Sun, Mar 22, 2015 at 07:53:15PM -0400, David Miller wrote: > > We want no reference counting of the neighbour entries, that's one of > the main points of all this. > > That way packets getting stuck do not run into the classic > dreaded "Neighbour table overflow", remember that? Right. > THAT is what is attackable when people have /8 subnets and > someone just spam pings every host on that subnet. > > That is a more serious exposure than this hashing issue. > > At least with ref-less use, as we have now, we could trim hash chains > that get too large with almost no barriers whatsoever because nearly > every neigh entry has no external references outside of these demux > sequences. Yes if we trim the buckets to keep the chain length under a limit it should be good enough I think. Thanks, -- Email: Herbert Xu <herbert@...dor.apana.org.au> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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