Date: Sat, 02 Mar 2002 02:45:05 +0000
From: Ian Dowse <iedowse@maths.tcd.ie>
To: Sergey Babkin <sergey@caldera.com>
Cc: arch@freebsd.org, chawla@caldera.com
Subject: Re: proposition for new socket syscalls {send,recv}fromto
Message-ID: <200203020245.aa34899@salmon.maths.tcd.ie>
In-Reply-To: Your message of "Fri, 01 Mar 2002 18:10:56 EST." <3C800A80.96CEA9D2@caldera.com>
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In message <3C800A80.96CEA9D2@caldera.com>, Sergey Babkin writes: > >The fix in short: the server should do a bind() to the right address >before doing the reply. However in practice this code gets much more >compilcated and ugly, as will be discussed further. Linux has an IP_PKTINFO socket option and IP_PKTINFO control message that (I think) allows you record the destination IP on incoming datagrams and set the source address on outgoing ones. A quick, minimally tested sample program which uses it is at: http://www.maths.tcd.ie/~iedowse/FreeBSD/pktinfo.c In FreeBSD, we only seem to have this capability for IPv6, using the IPV6_PKTINFO option and control messages. Implementations of either an IP_PKTINFO or an IP_SENDSRCADDR control message have been discussed on freebsd-net a few times, but nothing has been committed yet. For systems that have such a mechanism, the proposed syscalls could just be implemented as library functions instead. Ian To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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