NetBSD Problem Report #56783
From www@netbsd.org Wed Apr 6 18:11:24 2022
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Date: Wed, 6 Apr 2022 18:11:22 +0000 (UTC)
From: andrew.cagney@gmail.com
Reply-To: andrew.cagney@gmail.com
To: gnats-bugs@NetBSD.org
Subject: support the sadb_x_policy_priority extension
X-Send-Pr-Version: www-1.0
>Number: 56783
>Category: kern
>Synopsis: support the sadb_x_policy_priority extension
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: kern-bug-people
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Wed Apr 06 18:15:00 +0000 2022
>Originator: Andrew
>Release: mainline
>Organization:
>Environment:
N/A
>Description:
Given two identical policies. One with and one without corresponding state, it isn't possible to specify which should be prefered. Linux and, I suspect, FreeBSD resolve this by specifying the policy's priority (the sadb_x_policy_priority extension) (smallest wins).
For instance (I suspect this requires the spd acquire extension, which is also missing but i digress) given a policy with no state vis:
192.1.2.45[any] 192.1.2.23[any] 255(reserved)
out ipsec
an outgoing packet to 192.1.2.23 will trigger an acquire event so that the IKE daemon can establish an IPsec tunnel (installing policy+state):
192.1.2.45[any] 192.1.2.23[any] 255(reserved)
out ipsec
esp/transport/192.1.2.45-192.1.2.23/require
spid=2 seq=0 pid=794
refcnt=0
the problem is that the two policies have identical src/dst. Having a priority field lets the kernel resolve this.
>How-To-Repeat:
>Fix:
(Contact us)
$NetBSD: query-full-pr,v 1.46 2020/01/03 16:35:01 leot Exp $
$NetBSD: gnats_config.sh,v 1.9 2014/08/02 14:16:04 spz Exp $
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