netdev - Re: Question about inet_rtm_getroute_build

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Date:   Fri, 27 Aug 2021 08:09:39 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     David Ahern <dsahern@...il.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Networking <netdev@...r.kernel.org>,
        Roopa Prabhu <roopa@...dia.com>
Subject: Re: Question about inet_rtm_getroute_build_skb()



On 8/26/21 9:37 PM, David Ahern wrote:
> On 8/26/21 6:16 PM, Eric Dumazet wrote:
>> Hi Roopa
>>
>> I noticed inet_rtm_getroute_build_skb() has this endian issue 
>> when building an UDP header.
>>
>> Would the following fix break user space ?
> 
> I do not see how. As I recall this is only for going through
> ip_route_input_rcu and ip_route_output_key_hash_rcu and a call to
> fib4_rules_early_flow_dissect.
> 

Ah, nice !

Could we add a test for this feature ?
I could not really figure out reading the commit changelog how this stuff was used.