From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2770623DB for ; Fri, 15 Sep 2023 03:49:11 +0000 (UTC) Received: from mail-oi1-x22a.google.com (mail-oi1-x22a.google.com [IPv6:2607:f8b0:4864:20::22a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2BAE0196 for ; Thu, 14 Sep 2023 20:49:11 -0700 (PDT) Received: by mail-oi1-x22a.google.com with SMTP id 5614622812f47-3a8614fe8c4so1089046b6e.1 for ; Thu, 14 Sep 2023 20:49:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1694749750; x=1695354550; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=nPjjclwNyALFuH/baa790B/YULmKXPGsRhDjznlRHXU=; b=GmI642Nk5/qjPAGM4Y/onKBQxA5Y38b0D2TyGNHPw8kmF3xYuGe+LBLEjke2XmgqYk 5qqCo3sK6rTL3m5do9842G0LpwGz4JrJZsmQBBKGDJSw7tqgmDIYISA5gVZ2/EbD4XfT dIQG7Y3AyQjUlcNZfsrBefDwBKl6ETm+4CoNB2zWr7yt9QbNbcDEFQX6E3dQK68STWcW rD4Y06PG+KCeFxnMXW8Wg+AGBnyWBKmm+77zA/nKqwN61DMILmz1rFcUGW3PgOf4ptYC bg+oKT3r8wsUPjVRlc79EzvQetG5oS6uJICsFC6yaYnlmIJK6eXZ3KtjmUPpMOOfOrF7 gDmg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1694749750; x=1695354550; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=nPjjclwNyALFuH/baa790B/YULmKXPGsRhDjznlRHXU=; b=GCupAs7VaoXvT3uw2ehCKTaGZFXyqSLiWeNbryjDCbxfoXSCQPkny/JFjwQR4+o+J7 TMwiQlV2TR4b1OqvTi/jhJkO4RL/WeRo11e/2v0jLxpvrKbstqJKHlEniWF1zgCTHWg1 Llv+n+bf8Z3lj7jLAiChfBsFP8WfXh3CMnvzgHG0VebTkn2kVxLaP6cG9IaiwkHCLCEO WhrL7NmLQSb348Rorxsr+bLOstCubZ/rGcfPNS7rro8P70k2n5tKht9IDFmwxcAmXk6S fe0IUr3bv1E0MhBR+JIXm9Tq3zx/aF4p0viDPi29x4CBNkJKF/YH+rhWrPy73lZxd6jx pi7g== X-Gm-Message-State: AOJu0YzoHI0hbDNwLNu2DoufYgETOgINuWKTd3PONLCdsCfaBglSdA/8 Z3VOswjxD4NI+sj2WkQhXVM= X-Google-Smtp-Source: AGHT+IGpyGTcAbx4cfyDhIXccmBrkGZhLwoDCfo/JXY+FSELy2qLWPiL+T8OsExW8Kh96KAoF/+Xhw== X-Received: by 2002:a05:6808:3d1:b0:3a7:4b9a:43c2 with SMTP id o17-20020a05680803d100b003a74b9a43c2mr537684oie.13.1694749750369; Thu, 14 Sep 2023 20:49:10 -0700 (PDT) Received: from Laptop-X1 ([43.228.180.230]) by smtp.gmail.com with ESMTPSA id g21-20020aa78755000000b0068fb783d0c6sm2068832pfo.141.2023.09.14.20.49.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 14 Sep 2023 20:49:09 -0700 (PDT) Date: Fri, 15 Sep 2023 11:49:05 +0800 From: Hangbin Liu To: Nicolas Dichtel Cc: David Ahern , netdev@vger.kernel.org, "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Ido Schimmel , Thomas Haller Subject: Re: [PATCH net-next] ipv6: do not merge differe type and protocol routes Message-ID: References: <20230830061550.2319741-1-liuhangbin@gmail.com> <01baf374-97c0-2a6f-db85-078488795bf9@kernel.org> <62bcd732-31ed-e358-e8dd-1df237d735ef@6wind.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Fri, Sep 01, 2023 at 11:50:12AM +0200, Nicolas Dichtel wrote: > > + ip -6 route flush table 300 > > + ip link add dummy1 up type dummy > > + ip link add dummy2 up type dummy > > + ip addr add 2001:db8:101::1/64 dev dummy1 > > + ip addr add 2001:db8:101::2/64 dev dummy2 > > + ip route add local 2001:db8:103::/64 via 2001:db8:101::10 dev dummy1 table 100 > > + ip route append unicast 2001:db8:103::/64 via 2001:db8:101::10 dev dummy1 table 100 > > RTNETLINK answers: File exists > > > > ^^ here the append still failed > And if I play a little bit of the devil's advocate: why is it rejected? It's not > the same route, the types differ :) This is actually for compatibility... > > > > > + ip route append unicast 2001:db8:103::/64 via 2001:db8:101::10 dev dummy2 table 100 > > + ip -6 route show table 100 > > local 2001:db8:103::/64 via 2001:db8:101::10 dev dummy1 metric 1024 pref medium > > 2001:db8:103::/64 via 2001:db8:101::10 dev dummy2 metric 1024 pref medium > > What is the purpose of such a routing table? As I replied in last mail. I don't have a clear purpose. A user may use the local route to block traffic temporary. > How is the gateway of a local route used by the kernel? I don't know. IPv6 support this since beginning... > Which route will be used when a packet enters the stack? The first one it find? Thanks Hangbin