Date: Mon, 14 Jan 2002 17:32:11 +0530 From: "Kshitij Gunjikar" <kshitijgunjikar@yahoo.com> To: <freebsd-net@freebsd.org> Subject: RE: Filtering packets received through an ipsec tunnel Message-ID: <DJEEIBCKNENADJJIMPLFAEGNCDAA.kshitijgunjikar@yahoo.com>
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Hi Rene, I'm wondering why do you want to filter Secure traffic? The very fact that you have a tunnel to a place means you trust that network. Hence, why filter? What are the complex situations you have in mind? Regards Kshitij -----Original Message----- From: owner-freebsd-net@freebsd.org [mailto:owner-freebsd-net@freebsd.org]On Behalf Of Rene de Vries Sent: Sunday, January 13, 2002 10:32 PM To: net@freebsd.org Subject: Filtering packets received through an ipsec tunnel Hello, > This message was already posted to hackers@freebsd.org, but with > limited success. I'm hoping that someone on net@freebsd.org can give me > some more information. By experimenting with ipsec and looking at the source of "ip_input.c" a co-worker and I found the following out. When a ipsec tunnel packet is received this (protocol 50/51) packet is passed through ip-filter (& co). After filtering and when it has been determent that the current host is the destination (tunnel end-point), this packet is decrypted/verified. The decrypted packet is then pushed back into the queue that leads to ip_input(...). So far so good.... But once in ip_input(...) the filtering code is skipped and we were wondering why. I know that ipsec has some handles to be able to filter on address, protocol and/or port. But for more complex situations this is not enough. In these situations it would be nice to be able to use ip-filter (& co) on traffic from the tunnel (and also for traffic going into the tunnel). I was wondering why this is implemented the way it is. Maybe someone on this list could shed a light on this? Rene -- Rene de Vries <rene@tcja.nl> To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message _________________________________________________________ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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