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

[Stephen Hemminger]

Andrew Morton wrote:
> On Tue, 12 Feb 2008 16:50:44 -0800 Stephen Hemminger <shemminger@xxxxxxxxxx> 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
> >    <main>:
> >    --- 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).
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