Date: Mon, 7 Jun 2004 11:44:10 +0400 From: Gleb Smirnoff <glebius@cell.sick.ru> To: Ruslan Ermilov <ru@freebsd.org> Cc: net@freebsd.org Subject: Re: HEADSUP! netgraph Metadata changing. Message-ID: <20040607074410.GC18232@cell.sick.ru> In-Reply-To: <20040607073812.GA339@ip.net.ua> References: <Pine.BSF.4.21.0406061825360.15217-100000@InterJet.elischer.org> <20040607071701.GC17986@cell.sick.ru> <20040607073812.GA339@ip.net.ua>
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On Mon, Jun 07, 2004 at 10:38:12AM +0300, Ruslan Ermilov wrote: R> On Mon, Jun 07, 2004 at 11:17:01AM +0400, Gleb Smirnoff wrote: R> > On Sun, Jun 06, 2004 at 06:35:51PM -0700, Julian Elischer wrote: R> > J> In addition the ng_ksocket node adds info into metadata and I suspect R> > J> there are people using that. R> > R> > Since ng_ksocket tags packets for itself only, we can safely change it. R> > R> I use this feature in one proprietary module (need to send/recevive R> UDP datagrams to/from different destinations). Does your module reads/writes meta? Or just forwards the meta? If it just forwards meta, does it allocate new mbuf? If it does, then you should copy tag from old mbuf to a new one. If it does not allocate new mbuf, than our ng_ksocket change won't break your module. -- Totus tuus, Glebius. GLEBIUS-RIPN GLEB-RIPE
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