linux-kernel - Re: [PATCH net v2] ipv6: socket SO_BINDTODEVICE lookup routing fail without IPv6 rule.

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Message-ID: <20250103181431.536909ad@kernel.org>
Date: Fri, 3 Jan 2025 18:14:31 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Shiming Cheng <shiming.cheng@...iatek.com>
Cc: <willemdebruijn.kernel@...il.com>, <davem@...emloft.net>,
 <dsahern@...nel.org>, <edumazet@...gle.com>, <pabeni@...hat.com>,
 <horms@...nel.org>, <matthias.bgg@...il.com>,
 <angelogioacchino.delregno@...labora.com>, <linux-kernel@...r.kernel.org>,
 <linux-arm-kernel@...ts.infradead.org>,
 <linux-mediatek@...ts.infradead.org>, <netdev@...r.kernel.org>,
 <lena.wang@...iatek.com>
Subject: Re: [PATCH net v2] ipv6: socket SO_BINDTODEVICE lookup routing fail
 without IPv6 rule.

On Fri, 3 Jan 2025 13:43:49 +0800 Shiming Cheng wrote:
> When using socket IPv6 with SO_BINDTODEVICE, if IPv6 rule is not
> matched, it will return ENETUNREACH. In fact, IPv4 does not behave
> this way. IPv4 prioritizes looking up IP rules for routing and
> forwarding, if not matched it will use socket-bound out interface
> to send packets. The modification here is to make IPv6 behave the
> same as IPv4. If IP rule is not found, it will also use socket-bound
> out interface to send packts.

CI shows failures in tools/testing/selftests/net/fcnal-test.sh
and tools/testing/selftests/net/fib_nexthops.sh with this patch
applied. Could be a flake but please double check before sending v3