netdev - getifaddrs

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Message-ID: <20110120125713.GB743@e-circ.dyndns.org>
Date:	Thu, 20 Jan 2011 13:57:13 +0100
From:	Kurt Van Dijck <kurt.van.dijck@....be>
To:	netdev@...r.kernel.org, socketcan-core@...ts.berlios.de
Subject: getifaddrs

Hello,

I am in the process of adding j1939 support in the linux kernel.
J1939 is a protocol on CAN, with addressing support. Therefore,
I'm tweaking in iproute2 as well, to extend the
$ ip address
output.

I have in kernel space
	rtnl_register(PF_CAN, RTM_GETADDR, NULL, j1939_nl_dump_ifaddr);
This 'j1939_nl_dump_ifaddr' does not dump 'struct sockaddr *', but
an ad-hoc format.

After I get a basic setup working, I tried calling 'getifaddrs'.
If I do 'getifaddrs', this callback is called, but
I do not understand how glibc (or any other libc) is capable of transforming
the rtnetlink address info into proper 'struct sockaddr_can *'.

I looked at AF_INET & AF_DECnet, and it seems I'm not supposed to
dump a 'struct sockaddr_can' over rtnetlink. Is 'getifaddrs' then doomed
to only work for INET addresses only?

Any idea's?

Thanks,
Kurt
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