lkml.org 
[lkml]   [2018]   [May]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: WARNING in ip_recv_error
On Fri, May 18, 2018 at 11:44 AM, David Miller <davem@davemloft.net> wrote:
> From: Eric Dumazet <eric.dumazet@gmail.com>
> Date: Fri, 18 May 2018 08:30:43 -0700
>
>> We probably need to revert Willem patch (7ce875e5ecb8562fd44040f69bda96c999e38bbc)
>
> Is it really valid to reach ip_recv_err with an ipv6 socket?

I guess the issue is that setsockopt IPV6_ADDRFORM is not an
atomic operation, so that the socket is neither fully ipv4 nor fully
ipv6 by the time it reaches ip_recv_error.

sk->sk_socket->ops = &inet_dgram_ops;
< HERE >
sk->sk_family = PF_INET;

Even calling inet_recv_error to demux would not necessarily help.

Safest would be to look up by skb->protocol, similar to what
ipv6_recv_error does to handle v4-mapped-v6.

Or to make that function safe with PF_INET and swap the order
of the above two operations.

All sound needlessly complicated for this rare socket option, but
I don't have a better idea yet. Dropping on the floor is not nice,
either.

\
 
 \ /
  Last update: 2018-05-18 19:11    [W:0.048 / U:1.520 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site