Date: Tue, 24 Aug 2004 20:58:49 GMT From: "Christian S.J. Peron" <csjp@FreeBSD.org> To: csjp@FreeBSD.org, ipfw@FreeBSD.org, csjp@FreeBSD.org Subject: Re: kern/63961: ipfw2 uid matching doesn't work correctly Message-ID: <200408242058.i7OKwnuE068925@freefall.freebsd.org>
next in thread | raw e-mail | index | archive | help
Synopsis: ipfw2 uid matching doesn't work correctly Responsible-Changed-From-To: ipfw->csjp Responsible-Changed-By: csjp Responsible-Changed-When: Tue Aug 24 20:57:29 GMT 2004 Responsible-Changed-Why: I think this might not be a bug. If you want to match setup packets for TCP connections it does work, but only if the connection has a PCB associated with it. For instance, outgoing setup would have a PCB associated with it, so ipfw could match on that: dev0# ipfw show 00400 1 64 count tcp from any to any dst-port 4296 setup uid csjp It should be noted that all the "setup" keyword does is set the O_TCPFLAGS opcode and set the operand to TH_SYN for SYN packets. I dont think Incoming TCP connection requests would not have a PCB associated with it, so there is no-way that ipfw can look up the credential associated with it. However the UID negation problem looks like it could be a bug either in how ipfw(8) reports the rule or how the kernel is processing it. In either case I will look into it. http://www.freebsd.org/cgi/query-pr.cgi?pr=63961
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200408242058.i7OKwnuE068925>