Re: [PATCH 2/4] fib_trie: improve output format for /proc/net/fib_trie

Stephen Hemminger
2008-02-13T03:24:21Z

Andrew Morton wrote:
> On Tue, 12 Feb 2008 16:50:44 -0800 Stephen Hemminger <shemminger@vyatta.com> wrote:
>
>
>> Make output format prettier (more tree like).
>>
>> <local>:
>> --- 0.0.0.0/0
>> |--- 10.111.111.0/24
>> | +-- 10.111.111.0/32 link broadcast
>> | |--- 10.111.111.254/31
>> | | +-- 10.111.111.254/32 host local
>> | | +-- 10.111.111.255/32 link broadcast
>> |--- 127.0.0.0/8
>> | |--- 127.0.0.0/31
>> | | +-- 127.0.0.0/32 link broadcast
>> | | +-- 127.0.0.0/8 host local
>> | | +-- 127.0.0.1/32 host local
>> | +-- 127.255.255.255/32 link broadcast
>> |--- 192.168.1.0/24
>> | |--- 192.168.1.0/28
>> | | +-- 192.168.1.0/32 link broadcast
>> | | +-- 192.168.1.9/32 host local
>> | +-- 192.168.1.255/32 link broadcast
>> :
>> --- 0.0.0.0/0
>> |--- 0.0.0.0/4
>> | +-- 0.0.0.0/0 universe unicast
>> | +-- 10.111.111.0/24 link unicast
>> +-- 169.254.0.0/16 link unicast
>> +-- 192.168.1.0/24 link unicast
>>
>
> isn't that a non-back-compatible kernel ABI change? It might
> break pre-existing parsers?
>
>
Fib trie was always experimental and the output format was intended to
be tree like
but was broken. There are no known parsers of fib trie, and I think
Vyatta will probably
be the first distro to ship with it enabled.
> aside: how lame are we to put pretty-printers in the kernel?
> English-only ones, at that? Root cause: kernel developers still
> don't have a sufficiently easy way of shipping userspace tools.
Agreed, the structure of the trie doesn't come out via netlink (only the
addresses).