On Thu, May 20, 2010 at 10:11 PM, Patrick McHardy <kaber@xxxxxxxxx> wrote: > Changli Gao wrote: >> I have implemented a simple SYNPROXY iptables target. It is much like >> the SYNPROXY implementation in pf of OpenBSD, but won't have state >> until the first connection is established with the help of syncookies. >> The code is hosted at github: >> >> http://github.com/xiaosuo/xiaosuo/tree/master/synproxy/ >> >> Currently, it can work with firewall and local socket. >> >> It is in the very early stage, and ugly. And I will add --timeout >> parameter to this target as TCP_DFER_ACCEPT, so I can do NAT basing on >> the request data. >> >> i.e. >> >> iptables -t nat -A OUTPUT -p tcp -m synproxy --http-url "*.jpg" -j >> DNAT --to-destination $image_http_server:80 >> >> And is there any chance to merge it into mainline? > > If you can state a good use case, sure. I don't know much about the > PF synproxy myself. > pure synproxy can be used on firewall to protect the internal servers, which don't support neither syncookies and synproxy, from the attack of SYN-flood. synproxy with defered connection relay acts as a layer 7 proxy, but works in kernel space totally, unlike tcp splice tech., which needs the applications in user space parse the requests, and establish the connections. -- Regards， Changli Gao(xiaosuo@xxxxxxxxx) -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
