Date: Fri, 31 Oct 2014 13:48:41 +0300 From: "Andrey V. Elsukov" <bu7cher@yandex.ru> To: Hooman Fazaeli <hoomanfazaeli@gmail.com>, "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: transparent udp proxy Message-ID: <54536909.3030507@yandex.ru> In-Reply-To: <54535B82.405@gmail.com> References: <54535B82.405@gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On 31.10.2014 12:50, Hooman Fazaeli wrote: > Hi, > > I my setup, I use a fwd rule to forward all udp traffic to my local proxy: > > ipfw add 10 fwd localhost,7000 udp from any to any recv em1 > > The proxy needs to know the original destination address of forwarded > datagrams, but > there seems to be no way to obtain that address. > > Using recvmsg with IP_RECVDSTADDR does not help because it returns > next-hop address > instead of original destination. This is because udp_input() overwrites > packet's destination > with next-hop address before doing ip_savecontrol. Hi, udp_input() doesn't overwrite destination address. Probably you have NAT that does this. -- WBR, Andrey V. Elsukov
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?54536909.3030507>