From owner-freebsd-bugs@freebsd.org Mon Jun 5 17:48:30 2017 Return-Path: Delivered-To: freebsd-bugs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 304C4AFE097 for ; Mon, 5 Jun 2017 17:48:30 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 042443E36 for ; Mon, 5 Jun 2017 17:48:30 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id v55HmTJ3075363 for ; Mon, 5 Jun 2017 17:48:29 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 219803] [patch] PF: implement RFC 4787 REQ 1 and 3 (full cone NAT) Date: Mon, 05 Jun 2017 17:48:30 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: CURRENT X-Bugzilla-Keywords: patch X-Bugzilla-Severity: Affects Many People X-Bugzilla-Who: damjan.jov@gmail.com X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status keywords bug_severity priority component assigned_to reporter attachments.created Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 05 Jun 2017 17:48:30 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D219803 Bug ID: 219803 Summary: [patch] PF: implement RFC 4787 REQ 1 and 3 (full cone NAT) Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Keywords: patch Severity: Affects Many People Priority: --- Component: kern Assignee: freebsd-bugs@FreeBSD.org Reporter: damjan.jov@gmail.com Keywords: patch Created attachment 183243 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D183243&action= =3Dedit pf RFC 4787 req 1 and 3 implementation This patch implements RFC 4787 requirements 1 and 3, changing PF's allocati= on of NAT mappings for UDP from the current "symmetric" NAT to a "endpoint-independent mapping" NAT, a.k.a "full cone" NAT. All UDP packets = from the internal IP:port X:x go through the same external Y:y no matter the Z:z, and nothing but X:x uses Y:y. Internal External X:x -----> NAT Y:y ----> Z:z The implementation is relatively straightforward. pf_state for UDP connecti= ons now reference a pf_udp_mapping, which is reference counted, and kept alive = as long as at least 1 pf_state is referencing it. Every new NAT mapping that g= ets created tries to find a pf_udp_mapping by its source X:x endpoint and reuses its external Y:y, failing which, it creates a new one through an unused Y:y. Only allocation of NAT mappings is changed. Each X:x <-> Z:z still has its = own distinct connection state (struct pf_state) and behaves the same as before. Currently, only if a Z:z was previously transmitted to by X:x, can it trans= mit back to X:x through Y:y, i.e it behaves as a "port-restricted cone" NAT (or endpoint-independent mapping NAT with address- and port-dependent filtering= , as per RFC 4787), but I am working on that too. This should fix STUN and vastly improve UDP applications using PF's NATing = such as gaming, VoIP, WebRTC, peer to peer applications, etc. Are the NAT implementations in our other firewalls also "symmetric" NATs? --=20 You are receiving this mail because: You are the assignee for the bug.=