netdev - Re: [PATCH net] net: ipv6: Fix ping to link-local addresses.

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Date:	Tue, 9 Aug 2016 10:00:25 +0900
From:	Lorenzo Colitti <lorenzo@...gle.com>
To:	David Miller <davem@...emloft.net>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Erik Kline <ek@...gle.com>,
	吉藤英明 <hideaki.yoshifuji@...aclelinux.com>
Subject: Re: [PATCH net] net: ipv6: Fix ping to link-local addresses.

On Tue, Aug 9, 2016 at 6:35 AM, David Miller <davem@...emloft.net> wrote:
> We should always give sk_bound_dev_if the highest priority.
>
> Also, we should amend, not delete, the check against the scope
> ID in the sockaddr.  As explained by YOSHIFUJI Hideaki.

Sure, I can do that.

Note that pretty much every sendmsg codepath allows other data to take
precedence over sk_bound_dev_if:

- udpv6_sendmsg: if sin6_scope_id specified on a scoped address
- rawv6_sendmsg: if sin6_scope_id specified on a scoped address
- l2tp_ip6_sendmsg: if sin6_scope_id specified on a scoped address
- ip_cmsg_send: if IP_PKTINFO or IPV6_PKTINFO specified

What should I do about those? -EINVAL? Ignore the conflicting data? Leave as is?