Date: Fri, 09 Jan 2009 20:26:56 +0100 From: Attila Nagy <bra@fsn.hu> To: Adrian Chadd <adrian@FreeBSD.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r186955 - in head/sys: conf netinet Message-ID: <4967A500.30205@fsn.hu> In-Reply-To: <200901091602.n09G2Jj1061164@svn.freebsd.org> References: <200901091602.n09G2Jj1061164@svn.freebsd.org>
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Hello, Adrian Chadd wrote: > Author: adrian > Date: Fri Jan 9 16:02:19 2009 > New Revision: 186955 > URL: http://svn.freebsd.org/changeset/base/186955 > > Log: > Implement a new IP option (not compiled/enabled by default) to allow > applications to specify a non-local IP address when bind()'ing a socket > to a local endpoint. > > This allows applications to spoof the client IP address of connections > if (obviously!) they somehow are able to receive the traffic normally > destined to said clients. > > This patch doesn't include any changes to ipfw or the bridging code to > redirect the client traffic through the PCB checks so TCP gets a shot > at it. The normal behaviour is that packets with a non-local destination > IP address are not handled locally. This can be dealth with some IPFW hackery; > modifications to IPFW to make this less hacky will occur in subsequent > commmits. > > Thanks to Julian Elischer and others at Ironport. This work was approved > and donated before Cisco acquired them. > > Obtained from: Julian Elischer and others > MFC after: 2 weeks > Wouldn't it be better to implement existing interfaces for that? OpenBSD has a SO_BINDANY socket option and it seems it's also in BSD/OS: http://marc.info/?l=openbsd-cvs&w=2&r=1&s=bindany&q=b
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