netdev - Re: Source address fib invalidation on IPv6

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Message-ID: <CAHmME9pMzcwjveOoa08-fVCnZTkaoMz8y9DEc7f6b-4PeWu4xQ@mail.gmail.com>
Date:   Sun, 13 Nov 2016 01:43:08 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     David Ahern <dsa@...ulusnetworks.com>
Cc:     Netdev <netdev@...r.kernel.org>,
        WireGuard mailing list <wireguard@...ts.zx2c4.com>,
        LKML <linux-kernel@...r.kernel.org>,
        YOSHIFUJI Hideaki <hideaki.yoshifuji@...aclelinux.com>,
        Hannes Frederic Sowa <hannes@...essinduktion.org>
Subject: Re: Source address fib invalidation on IPv6

On Sat, Nov 12, 2016 at 8:08 PM, Jason A. Donenfeld <Jason@...c4.com> wrote:
>> Gotcha. I don't see any checks that the saddr is valid similar to what IPv4 does.
>>
>> I think the right place to add a check is in ip6_dst_lookup_tail():
>>     if (!ipv6_addr_any(&fl6->saddr)) {
>>         // saddr is valid for L3 domain
>>     }
>
> Right. It should probably do the check here, and return
> ERR_PTR(-EINVAL), the same as the v4 version, so that ret codes can be
> checked consistently.
>
> Thanks for looking into this. If you're backed up and would like me to
> submit a patch, just let me know, and I'll give it my best shot.

In perusing through the v6 FIB code, I don't even see an analog of
__ip_dev_find... Hm?